Which is a characteristic of calcium?
A.It has two neutrons
B.It has two energy shells
C.It has two protons
D.It has two electrons in its outer energy shell
Answers
It has two electrons in its outer energy shell
Related Questions
how much 6m naoh is required to make 500 ml of 0.1 m naoh? how much di water is required? show all your calculations.
Answers
The moral mass of NaOH required is 40 g/mol. Thus, the mass of NaOH which will be required to prepare 500 mL of 0.1M solution is 2.0 g.
For the given information of NaOH
Use the dilution equation M1V1 = M2V2
0.1M x 500 ml = 6.0M x V2
Solve for V2 = 8.33ml
Take 8.33 ml of the concentrated 6.0M NaOH in a volumetric pipet and put into a 500mL volumetric flask. Add distilled water to the 500mL mark of the flask. Mix well.
You needed to use the molarity formula: moles of solute/Liters of solution to find how many moles of solute you needed.
You correctly converted 500 mL to 0.5 L.
Now, we can put the information we already have into the formula
We want a solution with 0.1 M
So, we will do 0.1=x/0.5; 0.1*0.5
Solving for x, we find that we need 0.05 moles of solute NaOH.
The molar mass of NaOH is 40 g/mol. Thus, the mass of NaOH which will be required to prepare 500 mL of 0.1M solution is 2.0 g.
Learn more about dilution equation at:
brainly.com/question/11493179
#SPJ4
what's the answerrr?? :)
Magnesium ribbon reacts with dilute hydrochloric acid. Explain how altering the concentration of the hydrochloric acid alters the rate of the reaction???? (3 marks)
Answers
Explanation:
The reaction between magnesium ribbon and dilute hydrochloric acid is a classic example of a single replacement reaction, which can be represented by the following chemical equation:
Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)
In this reaction, magnesium (Mg) reacts with hydrochloric acid (HCl) to form magnesium chloride (MgCl2) and hydrogen gas (H2).
The rate of this reaction can be altered by changing the concentration of the hydrochloric acid. This is because the rate of a chemical reaction depends on the concentration of the reactants. Specifically, the rate of the reaction is proportional to the concentration of the reactants raised to some power, which is determined by the reaction's rate law.
In this reaction, the rate law can be expressed as:
Rate = k [Mg] [HCl]^x
Where k is the rate constant and x is the order of the reaction with respect to hydrochloric acid. The order of the reaction with respect to magnesium is one, since the concentration of magnesium does not change during the reaction.
When the concentration of hydrochloric acid is increased, the rate of the reaction increases because there are more hydrochloric acid molecules available to collide with magnesium atoms and react. This means that the value of x is greater than zero and the reaction is dependent on the concentration of hydrochloric acid.
Conversely, when the concentration of hydrochloric acid is decreased, the rate of the reaction decreases because there are fewer hydrochloric acid molecules available to react with magnesium. This means that the value of x is less than one and the reaction is not entirely dependent on the concentration of hydrochloric acid.
what does Le châteliers principle state?
Answers
Hope this helps!
Present in a state where it molecules are far apart during a change of state it's molecules slow down which change of state has most likely taken place from a gas to a liquid from a liquid to a gas from a solid to a liquid from a gas to a plasma
Answers
Answer:
The change of state that has occurred is from a gas to a liquid
Note: The question is incomplete. The complete question is given blow.
H₂O is initially present in a state where its molecules are far apart. During a change of state, its molecules slow down. Which change of state has most likely taken place?
from a gas to a liquid
from a liquid to a gas
from a solid to a liquid
from a gas to a plasma
Explanation:
Water can exists in three states: as gaseous water vapor, as liquid water, and as solid ice. Each of these states of water can be interconverted from one to another by the addition or removal of heat in a process known as change of state.
Liquid water can be converted to solid ice by the removal of heat, while solid ice ice can be converted to liquid water by the addition of heat. Also, liquid water can be converted to water vapor by the addition of heat, while water vapor can be converted to liquid water by the removal of heat.
Of the three states of water, the one in which the molecules are farthest apart is in the gaseous state. The molecules have high kinetic energy and move randomly while colliding with one another. When a heat is removed from these highly energetic molecules, the molecules slow down and lose some of their kinetic energy and a change of occurs from gaseous to liquid state.
Therefore, the change of state that occurred as described, is from gas to liquid.
1. what is an aquifer? a. a water purification system b. water distribution system c. geological formation that stores water d. a drinking water solution
Answers
An aquifer is a geological formation that stores water. they are higher than the surrounding terrain, which can lead to springs or artesian wells that are in motion. An aquifer can be a well, spring, lake ,etc.
What is an aquifer?Water collects in geological formations called aquifers, frequently at great depths in the earth. Some aquifers are higher than the surrounding terrain, which can lead to springs or artesian wells that are in motion.
Hence, An aquifer is a geological formation that stores water. they are higher than the surrounding terrain, which can lead to springs or artesian wells that are in motion.
to know more about aquifer visit
https://brainly.com/question/14916917
#SPJ4
For parts of the free response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer.
Answers
The number of moles of CO₂ present in the vessel at equilibrium is calculated as 1.040 moles.
1) V = 100L = 0.1 cubic metre
Pressure = 1 atm = 101325 Pascal.
R = 8.314 J/K mole.
T = 898•C = 898 + 273 = 1171 K
Using ideal gas equation , PV= nRT
n = PV/RT
n = 101325 × 0.1/8.314 × 1171
n = 10132.5 / 9735
= 1.040 moles.
2) equilibrium constant = [Product]/[Reactant]
Kp = [CaO][CO₂]/[CACO₃]
Initial moles of CaCO₃ = 2 moles .
Initial moles of CaO = 0 .
Initial moles of CO₂ = 0 .
Moles at equilibrium of CaCO₃ = 2-x.
Moles at equilibrium of CaO = x.
Moles at equilibrium of CO₂ = x.
Moles of CO₂ = 1.040 moles
Moles at equilibrium of CaCO₃ = 2-1.040 = 0.96 moles.
Moles at equilibrium of CaO = 1.040 moles.
Moles at equilibrium of CO₂ = 1.040 moles.
Concentration = moles / volume .
Concentration of CaCO₃ = 0.96/100(in litre)
= 0.0096 moles / litre.
Concentration of CaO = 1.040/100 = 0.01040 moles / litre.
Concentration of CO₂ = 1.040/100
= 0.01040 moles / litre.
Equilibrium constant = 0.0096/0.01040× 0.01040
= 0.0096/0.00010816
= 88.75 .
What gives it its name, "ideal gas equation"?
An ideal gas is a hypothetical gas made out of many haphazardly moving point particles that are not expose to interparticle co-operations. The ideal gas idea is helpful on the grounds that it complies with the best gas regulation, an improved on condition of state, and is manageable to examination under factual mechanics.
Incomplete question:
For parts of the free response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer.For parts of the free-response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate CaCO₃(s)CaO(s) +CO₂(g) When heated strongly, solid calcium carbonate decomposes to produce solid calcium oxide and carbon dioxide gas, as represented by the equation above. A 2.0 mol sample of CaCO₃(s) is placed in a rigid 100. L reaction vessel from which all the air has been evacuated. The vessel is heated to 898 C at which time the pressure of CO₂(g) in the vessel is constant at 1.00 atm, while some CaCO₃(8) remains in the vessel. (a) Calculate the number of moles of CO₂(9) present in the vessel at equilibrium B. 0 / 10000 Word Limit (b) Write the expression for Kp the equilibrium constant for the reaction, and determine its value at 898 C B 0 / 10000
Learn more about Ideal Gas equation:
brainly.com/question/20348074
#SPJ4
The experiment set-up shown in the picture has a light-proof box with a small hole on one side. What will be the shape of the image of the arrow on the opposite wall?
(The arrow is pointing up in the image of the arrow, also the box has a hole on it's left side.)
A. Left
B. Up
C. Down
D. Right
Answers
Answer: A.
Explanation: When light passes through a small hole, it creates an inverted image on the opposite side. In this case, since the arrow is pointing up, the inverted image will appear pointing down on the opposite wall. Furthermore, since the box has a hole on its left side, the inverted image will be shifted towards the left.
Coal is a fossil fuel that we burn for fuel. We also use it in water and air purification systems, medical equipment, and as a building material. Describe how coal is formed, where it gets its original source of energy from, and why its distribution varies around the world. Then state whether coal is likely being formed today
Answers
Coal is formed through a process called coalification, which takes place over millions of years. It begins with the accumulation of plant matter in swamps and marshes, where the organic material undergoes decomposition under conditions of heat, pressure, and lack of oxygen.
Coalification, also known as coal formation, is a geological process that transforms organic material into coal over millions of years. It occurs through a series of complex changes involving heat, pressure, and time. The process begins with the accumulation of plant debris, such as leaves, wood, and other organic matter, in swampy environments.
As the organic material gets buried under layers of sediment, it undergoes a transformation known as peatification. Peat, a low-grade form of coal, is formed as the organic matter decomposes in a waterlogged environment. Over time, as more sediment accumulates, the peat becomes subjected to increasing pressure and temperatures due to the weight of the overlying layers.
To know more about Coalification refer to-
brainly.com/question/30100925
#SPJ4
in the laboratory a student measures the percent ionization of a 0.596 m solution of hydrofluoric acid to be 3.35%. calculate value of from this experimental data.
Answers
The value of Ka for hydrofluoric acid is 6.84 x\(10^{-4}\)from this experimental data.
To calculate the value of Ka from the given experimental data, we first need to determine the concentration of H+ ions in the solution at equilibrium. The percent ionization is defined as the ratio of the concentration of ionized H+ ions to the initial concentration of acid. Therefore, we can write: \(% ionization = [H+]/[HF]initial x 100%\)% ionization = [H+]/[HF]initial x 100%
Where [HF]initial is the initial concentration of hydrofluoric acid. Rearranging this equation, we get: [H+]/[HF]initial = % ionization / 100% Plugging in the values, we get: \([H+]/0.596 = 3.35/100 [H+] = (3.35/100) x 0.596 [H+] = 0.01996 M\)
Now, we can use the equilibrium expression for the dissociation of hydrofluoric acid to calculate\(Ka: HF ⇌ H\)+ + F- Ka = [H+][F-]/[HF] Substituting the values, we get: Ka = (0.01996 x 0.01996) / (0.596 - 0.01996) Ka = \(6.84 x 10^-4\)
In summary, to calculate the value of Ka from the percent ionization of a solution, we first need to determine the concentration of H+ ions in the solution at equilibrium using the percent ionization equation. Then, we can use the equilibrium expression for the acid dissociation reaction to calculate Ka.
Learn more about hydrofluoric acid here:
https://brainly.com/question/24194581
#SPJ1
What happens in the nucleus when a lithium atom becomes an ion
Answers
Answer:
An atom that gains a negative electron, it becomes a negative ion. ... A lithium atom has 3 protons and 3 electrons. It can lose one of its electrons, making it an ion. It now has more positive protons than electrons so it has an overall positive charge.
Answer:
This means a Lithium atom formed into a Lithium ion by losing one of its electrons. It has three electrons and three protons to begin with. So when it loses or gains one the amount isnt equal, that is why it becomes an ion. If it gained electrons it would have a negative charge on the nulcleus, though if it lost electrons it would have a positivec charge. Hope this helped!!
For the reaction Cl2O + 3/2 O2 (g) <--> 2 ClO2 .... Delta H = 126 kJ/mol. Delta S = -74.9 J/Mol K at 298 K. What is the Keq? Answer: 1.0 x 10-26.
2. O3 (g) + 2NO2 (g) --> O2 (g) + N2O5 (g)
(1) O3 + NO2 <--> O2 +NO3 (fast equil.)
(2) NO3 + NO2 --> N2O5 (slow)
What is the rate law of the above reaction?
Answers
The equilibrium constant (Keq) for the reaction Cl₂O + 3/2 O₂ (g) ⇌ 2 ClO₂ at 298 K is 1.0 x 10⁻²⁶.
Determine the equilibrium constant?The equilibrium constant (Keq) is determined using the equation Keq = \(\rm e^{(-\Delta G/RT)\), where ΔG is the standard free energy change, R is the gas constant, and T is the temperature in Kelvin. However, in this case, we are given ΔH (enthalpy change) and ΔS (entropy change), so we need to use the equation ΔG = ΔH - TΔS.
Plugging in the given values:
ΔH = 126 kJ/mol = 126,000 J/mol
ΔS = -74.9 J/mol K
T = 298 K
ΔG = ΔH - TΔS
ΔG = 126,000 J/mol - 298 K * (-74.9 J/mol K)
ΔG = 126,000 J/mol + 22,320 J/mol
ΔG = 148,320 J/mol
Now, we can calculate Keq:
Keq = \(\rm e^{(-\Delta G/RT)\)
Keq = \(\rm e^{(-148,320\ J/mol) / (8.314\ J/mol K \times 298\ K))}\)
Keq ≈ 1.0 x 10⁻²⁶
Therefore, At a temperature of 298 K, the equilibrium constant (Keq) for the reaction between Cl₂O and 3/2 O₂ to form 2 ClO₂ is approximately 1.0 x 10⁻²⁶.
To know more about equilibrium constant, refer here:
https://brainly.com/question/29809185#
#SPJ4
the bromine is attached to . the stereochemistry of that carbon is . the methyl group is attached to . the stereochemistry if that carbon is .
Answers
Bromine is a halogen atom that can form covalent bonds with carbon in organic molecules. When bromine is attached to a carbon atom, the stereochemistry of that carbon is affected by the position of the bromine atom.
If the bromine is attached to a chiral carbon, which has four different groups attached to it, then it can create two stereoisomers, known as enantiomers. The enantiomers are mirror images of each other and have opposite stereochemistry. On the other hand, if the bromine is attached to a non-chiral carbon, which has two or three identical groups attached to it, then it does not affect the stereochemistry of that carbon. Similarly, when a methyl group is attached to a carbon atom, the stereochemistry of that carbon is determined by the arrangement of the other groups attached to it.
Based on your question, it seems you want to know about the structure of a molecule involving bromine and a methyl group. When bromine is attached to a carbon atom, the stereochemistry can be either R or S configuration, depending on the arrangement of other substituents around the carbon. Similarly, when a methyl group is attached to a carbon atom, its stereochemistry can also be either R or S configuration. To determine the specific stereochemistry of each carbon, you would need more information about the entire molecule and the positions of all other groups attached to those carbon atoms.
To know about stereochemistry :
https://brainly.com/question/13266152
#SPJ11
How many grams of carbon are contained in one mole of C3H8? (Report your
answer to two places past the decimal point. Moodle is looking for a number
only, no units.)
Answers
Considering the definition of molar mass, the mass of one mole of C₃H₈ is 44 grams.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.
Molar mass of C₃H₈In this case, you know the molar mass of the elements is:
C= 12 g/mole
H= 1 g/mole
So, the molar mass of the compound C₃H₈ is calculated as:
C₃H₈ = 3 ×12 g/mole + 8 ×1 g/mole
Solving:
C₃H₈ = 44 g/mole
Finally, the mass of one mole of C₃H₈ is 44 grams.
Learn more about molar mass:
brainly.com/question/5216907
brainly.com/question/11209783
brainly.com/question/7132033
brainly.com/question/17249726
#SPJ1
and a 40N Torce in a southeriy direction?
4. A car works harder to accelerate from 0 to 10km/hr than it does to maintain a 10km/hr speed. Why is this? A. b/c
static friction is harder to overcome than kinetic or rolling friction. B. b/c static friction is easier to overcome than
kinetic or rolling friction. C. b/c static friction is harder to overcome than potential energy. D. b/c static friction is
easier to overcome than gravity.
Answers
Answer:
C.
Explanation: because potential energy is the starting point before it moves. nothing has to be done.
How do you write copper II sulfate?
Answers
The chemical formula for copper II sulfate is \(CuSO_{4}\), which means that it is made up of one copper atom, one sulfur atom, and four oxygen atoms. The "II" in copper II sulfate indicates that the copper is in its +2 oxidation state.
Copper II sulfate, also known as cupric sulfate, is a chemical compound that is composed of copper, sulfur, and oxygen atoms. It is commonly used in a variety of industrial and laboratory applications, such as as a fungicide, algaecide and herbicide, in electroplating, in the production of other copper compounds and as a laboratory reagent.
To write the chemical formula for copper II sulfate, it is important to understand the chemical symbols for the elements involved. The chemical symbol for copper is Cu, the chemical symbol for sulfur is S, and the chemical symbol for oxygen is O.
To know more about copper refer here:
https://brainly.com/question/19761029#
#SPJ11
the side chain of an amino acid differentiates one amino acid from another. True or False?
Answers
True, the side chain of an amino acid differentiates one amino acid from another.
What is an amino acid?Amino acids are the building blocks of protein, which is a macronutrient essential for the growth and repair of body tissues, among other things.
The side chain of an amino acid distinguishes it from other amino acids. Amino acids are organic compounds that have two functional groups: an amino group (-NH2) and a carboxyl group (-COOH). They can be divided into two categories: non-essential amino acids, which are made by the body, and essential amino acids, which must be obtained from food.
Learn more about amino acid: https://brainly.com/question/21327676
#SPJ11
what is the percent composition of hydrogen in beryllium hydride(BeH2) if 69.6g of beryllium (Be) react with 15.6 g of hydrogen to produce 85.2 g of BeH2
Answers
The percent composition of hydrogen is 18.3%.
What is percent composition?The term percent composition refers to the percentage of a particular component in a compound. It is contained as the ratio of the mass of that component to the total mass multiplied by 100.
From the law of conservation of mass, total mass of beryllium hydride(BeH2) = 85.2 g
Mass of hydrogen = 15.6 g
Percent composition of hydrogen = 15.6 g/ 85.2 g × 100/1 = 18.3%
Learn more about percent composition: https://brainly.com/question/12247957
Silicon is a metalloid element commonly found in Earth's crust. It helps form many different compounds, which have a variety of different properties and applications.
One type of silicon-containing minerals is asbestos. Asbestos is resistant to heat and electricity, leading to its widespread use in manufacturing and the construction industry. Asbestos insulates buildings and makes them fire resistant. However, despite its usefulness, exposure to asbestos fibers or dust carries serious health risks that can cause respiratory disease or cancer.
Another silicon-containing compound is orthosilicic acid. Unlike asbestos, orthosilicic acid seems to benefit human health. This compound readily dissolves in water and is biologically stable enough to be used in the human body. Scientists have found evidence that orthosilicic acid plays an active role in the maintenance of strong bones.
The information above shows that silicon has both beneficial and detrimental effects on the human body. Given this information, think about other examples of materials or substances that can be both beneficial and detrimental at the same time. Research and write about two examples. Be sure to provide evidence to support your point of view.
Answers
Answer:
1. Zinc
Zinc also plays a vital role in our body because it is the main component of all cells and also provides protection against microbes. It is also needed for the production of DNA and protein. Zinc is good to take when you are feeling sick with a cold or even a sore throat. But Zinc in excess amount can cause copper deficiency, upset stomach aches, and diarrhea
2.Iron
Iron is a major component of hemoglobin which is responsible for the transportation of oxygen from the lungs to all cells of the body. Women take to iron a lot to give them energy after childbirth because they become iron deficient. Iron in excess can have a negative effect on our body such as it causes liver disease (cirrhosis, cancer), heart attack, diabetes and sometimes it causes death.
Explanation:
Indicate the most important type of intermolecular attraction responsible for solvation in each of the following solutions.
1. ethanol (C2H5OH) in water?
A. Dipole-dipole
B. Hydrogen Bonding
C. Ion-Dipole
D. Dispersion
Answers
The most important type of intermolecular attraction responsible for solvation in the ethanol-water solution is hydrogen bonding.
Hydrogen bonding is the most important type of intermolecular attraction in the ethanol-water solution. Ethanol (\(C_2H_5OH\)) is a polar molecule with a hydroxyl (-OH) group, which contains a highly electronegative oxygen atom and a hydrogen atom bonded to it. Water (\(H_2O\)) also has a polar structure with oxygen being highly electronegative. The oxygen atom in water can form hydrogen bonds with the hydrogen atom in ethanol, resulting in strong intermolecular attractions between the molecules. This hydrogen bonding allows ethanol to dissolve in water, forming a homogeneous mixture. The oxygen atom in water attracts the positively charged hydrogen atom in ethanol, and the hydrogen atom in water attracts the negatively charged oxygen atom in ethanol, creating an intermolecular network that stabilizes the solvated system. The presence of hydrogen bonding between ethanol and water molecules facilitates the dissolution of ethanol in water, making it the most important type of intermolecular attraction in this solution.
To learn more about solvation refer:
https://brainly.com/question/27464971
#SPJ11
Ammonia reacts with hydrochloric acid to produce ammonium chloride. Identify thebalanced reaction that describes this process.A) NH4+ + HCl ® NH4Cl + H D) NH4+ + 2HCl ® NH4Cl2B) NH3 + HCl ® NH4Cl E) NH3 + 2HCl ® NH4Cl2C) NH3 + 2HCl ® NH4Cl + HAns: B Category: Medium Section
Answers
Answer:
Explanation:
the correct answer is B :
NH3 + HCL ---> NH4Cl
The number of atoms on the reactant side should be equal to the number of atoms on the product side.
The object has a mass of 5 grams and a volume of 15 mL what is density
Answers
Answer:
1/3 g/mL
Explanation:
density= mass/ volume
In IONIC BONDING, the [Blank] TRANSFERS it’s electron(s) to the [Blank] .
Answers
Answer:
An ionic bond forms when atoms transfer electrons.
Explanation:
Ionic bonds are formed when atoms transfer electrons. (In contrast, covalent bonds are formed when atoms share electrons.)
There's a distinction between the two: when two atoms react to form an ionic bond, one atom would completely lose one electron, while the other would completely gain that electron. The atom that loses the electron becomes a positively-charged ion called a cation, whereas the atom that gains the electron becomes a negatively-charged ion called an anion.
For example, consider the reaction between a sodium atom and a chlorine atom: .
When the sodium atom and the chlorine atom encounter, the sodium atom would lose one electron to form a positively-charged sodium ion, . The chlorine atom would gain that electron to form a negatively-charged chlorine ion .
These two ions will readily attract each other because of the opposite electrostatic charges on them. This electrostatic attraction (between two ions of opposite charges) is an ionic bond.
Overall, it would appear as if the sodium atom transferred an electron to the chlorine atom to form an ionic bond.
In contrast, when two atoms react to form a covalent bond, they share electrons without giving any away completely. Therefore, it is possible to break certain covalent bonds apart (using a beam of laser, for example) and obtain neutral atoms.
On the other hand, when an ionic bond was broken, the result would be two charged ions- not necessarily two neutral atoms. The electron transfer could not be reversed by simply breaking the bond.
For example, when table salt is melted (at a very high temperature,) the ionic bond between the sodium ions and chloride ions would (mostly) be broken. However, doing so would only generate a mixture of and ions- not sodium and chlorine atoms.
What is the element symbol for Gold?
Answers
The element symbol for Gold is Au.
The Element Symbol for Gold is Au
Hope this helps please give me Brainliest if this is correct. :)
A student is investigating the percentage purity of ibuprofen in a sample of tablets. 6.00 g of a sample of impure ibuprofen tablets was crushed and dissolved in 200 cm³ of 0.200 mol dm-³ aqueous sodium hydroxide.
25.0 cm³ of this solution was withdrawn and titrated against hydrochloric acid. The unreacted NaOH in this solution required 24.40 cm³ of 0.120 mol dm of hydrochloric acid for complete neutralisation.
i) Calculate the amount of sodium hydroxide that has reacted with hydrochloric acid. (ans: 0.002928mol)
ii) Calculate the amount of sodium hydroxide unreacted in 200 cm³ solution.
(ans: 0.002928 x (200/25.0) = 0.0234mol)
I KNOW HOW TO DO PART i. PLEASE EXPLAIN HOW TO GET THE ANSWER FOR PART ii WITH THE GIVEN SOLUTION thank you
Answers
Based on the mole ratio of the reaction and the volume of the reactants used;
Amount in moles of hydroxide that has reacted with hydrochloric acid is 0.002928 molesAmount in moles of sodium hydroxide unreacted in 200 cm³ solution is 0.0234 moles.What is the amount of sodium hydroxide that reacted with hydrochloric acid?The amount of sodium hydroxide that reacted with hydrochloric acid is calculated from the mole ratio of the reaction between hydrochloric acid and sodium hydroxide.
The equation of the reaction is given as follows:
HCl (aq) + NaOH (aq) ---> NaCl + H₂O
The mole ratio of HCl and NaOH is 1 : 1
Moles of HCl in 24.40 cm³ of 0.120 mol dm of hydrochloric acid solution will be determined as follows:
Moles = molarity * volume in LitersMoles of HCl = 0.120 * 24.40 / 1000
Moles of HCl = 0.002928 moles
Thus moles of NaOH reacted = 0.002928 moles
The amount of sodium hydroxide unreacted in 200 cm³ solution is determined as follows:
Moles of sodium hydroxide unreacted in 25 cm³ solution = 0.002928 moles
Moles of sodium hydroxide unreacted in 200 cm³ solution = 0.002928 moles * 250 / 25
Moles of sodium hydroxide unreacted in 200 cm³ solution = 0.0234 moles.
Learn more about moles and molarity at: https://brainly.com/question/26873446
#SPJ1
In which kingdom do all organisms have cells that lack a cell wall?
fungsi
plants
animals
bacteria
Answers
Answer:
The answer is animals
Explanation:
Plants and fungi have a cell wall, and although most bacteria lack a cell wall, the question is asking in which kingdom do ALL organisms lack a cell wall. Hope this helps.
Answer:Bacteria
Explanation:
Which formula contains 2 non metals
Answers
Answer:
The answer is SiO2
Explanation:
Because nonmetals are those who gain electrons and form ve ions
6. Energy generated from
nuclear fusion in the sun's core is what causes
the sun to "shine" and radiate energy through
the solar system. In fusion, four hydrogen
atoms fuse together to become one helium
atom. The atomic mass of hydrogen is 1.00794
and the atomic mass of helium is 4.0026.
How does the difference in the mass of four
hydrogen atoms and one helium atom help
explain the energy released by the sun?
Answers
The atomic mass is 2.775 are released by the sun.
What is mass ?
The amount of matter in a body is referred to as its mass. The kilograms is the kilograms, which is the SI unit of mass (kg). Mass is defined as: Mass = Density /Volume.
What is atom ?
The smallest unit of matter that can participate in a chemical reaction is an atom. Electron, proton, and neutrons make up an atom. Atoms are incapable of existing alone.
Therefore, atomic mass is 2.775 are released by the sun.
Learn more about mass from the given link.
https://brainly.com/question/1838164
#SPJ1
Structural, electronic, and thermodynamic properties of TiO$_{2}$/organic clusters: performance of DFTB method with different parameter sets
Answers
A second-order extension of the Kohn-Sham total energy in density-functional theory (DFT) with respect to charge density fluctuations serves as the foundation for the density functional based tight binding (DFTB) approach.
What is DFTB method?
The density functional based tight binding (DFTB) electronic structure method was used to study the clusters of bare TiO2 and TiO2 with linked organic ligands modeling polyorganic composites used as photocatalytic materials. The results were compared to those obtained from B3LYP/6-31G(d,p) calculations, semiempirical methods PM6 and PM7, and available experimental data. It was discovered that the highly scalable DFTB approach produces outcomes that are nearly on the level of theory B3LYP/6-31G(d,p).The trans3d set more accurately reproduces the energies of the composite material production in polycondensation processes, but the corrected version of the tiorg DFTB parameter set (tiorg-smooth) performs better for structural parameter estimations. The tiorg-smooth and trans3d settings perform better than the matsci set in some way. Studies of adsorption complexes of bare TiO2 clusters can be conducted using the tiorg-smooth and matsci sets.Learn more about the Density with the help of the given link:
https://brainly.com/question/23487480
#SPJ4
Question 11 of 32
When do scientists form a hypothesis?
A. Before they form a theory
B. After they form a theory
O C. Before they perform an experiment
D. After they perform an experiment
SUBMIT
Answers
Answer:
C
Explanation:
a hypothesis always comes first
Answer:
C
Explanation:
They form hypothesis first, then perform the experiment to test the hypothesis. After multiple experiments, they form a theory.
Thus C is correct
please give thanks by hitting that heart button :)
An atom has 8 protons, 8 neutrons, and 10 electrons.
What is the mass of this atom?
Answers
16 is the mass of this atom.
The Oxygen (O) has an atomic number of 8 and has a mass number of 16. Upon accepting 2 electrons it becomes O2-. The mass number is defined as the sum of the number of protons and neutrons present in the molecule. So here for O2- it contains 8 protons,8 neutrons and 10 electrons.
To know more about atom
https://brainly.com/question/1566330