Antimony has two naturally occurring isotopes . The mass of antimony -121 is 120.904 amu and the mass of antimony -123 is 122.904 amu. Using the average mass from the periodic table, find the abundance of each isotope (Remember that the sum of the two abundances must be 100).

Answer:

1- there are 16 hydrogen atoms. ( heptane  C7H16)

2- The compound is octane (C8H18)

explanation

to determine any atom in an alkane, this formula is used Cn H 2n +2, where n is the number of carbon atoms in the molecule.

to find the compound in Q2 we'll apply the numbers:

C nH₂n+2

Answer:

hydrochloric acid

Explanation:

done this before

Answer:

Hydrochloric acid

Explanation:

Binary acids or Hydracids are certain molecular compounds in which hydrogen is combined with a second nonmetallic element.

Answer:

3.29 kg of chalcopyrite must be mined to obtain 400 g of pure Cu.

Explanation:

The molar mass of Cu is 63.55 g/mol. To determine the amount of Cu present in 1 mole of chalcopyrite, we need to calculate the molar mass of CuFeS2:

Cu: 1 atom x 63.55 g/mol = 63.55 g/mol

Fe: 1 atom x 55.85 g/mol = 55.85 g/mol

S: 2 atoms x 32.06 g/mol = 64.12 g/mol

Molar mass of CuFeS2 = 63.55 + 55.85 + 64.12 = 183.52 g/mol

Therefore, 1 mole of chalcopyrite contains 63.55 g/mol / 183.52 g/mol = 0.3466 moles of Cu.

To obtain 400 g of pure Cu, we need to convert the mass of Cu to moles:

400 g / 63.55 g/mol = 6.2978 moles of Cu

Finally, we can use the mole ratio between Cu and chalcopyrite to determine the amount of chalcopyrite needed:

1 mole Cu / 0.3466 moles CuFeS2 = 2.885 moles CuFeS2

6.2978 moles Cu x (1 mole CuFeS2 / 2.885 moles Cu) x (183.52 g/mol CuFeS2 / 1000 g) = 3.29 kg of chalcopyrite

Therefore, approximately 3.29 kg of chalcopyrite must be mined to obtain 400 g of pure Cu.

Volume the fluorine gas occupies = 0.73L

What is volume of a gas ?

The gas's volume:

The area occupied by gaseous particles under normal temperature and pressure circumstances is referred to as the volume of gas.

It is identified as a "V."

The letter "L" stands for "liters," the SI unit of volume.

At normal temperature, a mole of gas has a volume of 24 m3, or 24 000 cm3.

The molar volume of a gas is the name given to this quantity.

The gas equation

PV = n R T

P = pressure = 2.04 atm

T = temperature = 5.20 Celsius = 278.20K

V = volume

n = no of moles = 1.24/19 = 0.065moles

R = gas constant = 0.0821lit atm /K

V = 0.065*0.082*278.20/ 2.04 =  0.73L

Volume the fluorine gas occupies = 0.73L

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Answer:

\(0.01molO_2\)

Explanation:

Hello there!

In this case, by considering the definition of molar solution as the moles of solute over volume in liters or cubic meters of solution, we can see that actually 10.0 L of the solution are equal to 10.0 dm³. In such a way, since the concentration is 0.001 mol / dm³, the moles of oxygen that are dissolved turn out to be:

\(0.001mol/dm^3 * 10.0dm^3\\\\0.01molO_2\)

Best regards!

Once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 J, and its potential energy decreases to zero.

Potential energy is a type of energy that is stored and depends upon the relative height of system. If its height is increased, the potential energy is also increases while on the other hand, if the body comes to the surface of the earth, its potential energy will be zero due to no height of the object. We know that potential energy is equals to product of mass, gravity and height of an object.

So we can conclude that if the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 J, and its potential energy decreases to zero.

3.99 g of Fe₂S₃ solid product can be made from the given amount of FeCl₃.

A balanced equation for the reaction is:

FeCl₃ (aq) + 3Na₂S (aq) → Fe₂S₃ (s) + 6NaCl (aq)

In the stoichiometry of the reaction, 1 mole of FeCl₃ reacts with 1/3 moles of Fe₂S₃, or that 3 moles of FeCl₃ react with 1 mole of Fe₂S₃.

Moles of FeCl₃ = mass / molar mass

Moles of FeCl₃ = 9.34 g / 162.2 g/mol

Moles of FeCl₃ = 0.0575 mol

Since the reaction uses 3 moles of FeCl₃ to produce 1 mole of Fe₂S₃,

Moles of Fe₂S₃ = (0.0575 mol FeCl₃) / 3

= 0.0192 mol Fe₂S₃

Mass of Fe₂S₃ = moles × molar mass

Mass of Fe₂S₃ = 0.0192 mol × 207.9 g/mol

Mass of Fe₂S₃ = 3.99 g

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The change in entropy for the crystallization of 1.25 moles of butane can be calculated using the formula ΔS = ΔH_fusion / T, where ΔS is the change in entropy, ΔH_fusion is the enthalpy of fusion, and T is the temperature in Kelvin.

In the given problem, the enthalpy of fusion of butane is 24.3 kJ/mol. To convert this to J/mol, we multiply it by 1000, resulting in 24,300 J/mol. The melting point of butane is -0.5°C, which is equivalent to 272.65 K.

Using the formula, we can calculate the change in entropy as follows:

ΔS = (24,300 J/mol) / 272.65 K

    ≈ 89.25 J/(mol·K)

Therefore, the change in entropy for the crystallization of 1.25 moles of butane is approximately 89.25 J/(mol·K).

The change in entropy (ΔS) for the crystallization of a substance can be determined using the equation ΔS = ΔH_fusion / T, where ΔH_fusion is the enthalpy of fusion and T is the temperature in Kelvin. In this case, the enthalpy of fusion of butane is given as 24.3 kJ/mol, which is converted to 24,300 J/mol. The melting point of butane is -0.5°C, which is equivalent to 272.65 K.

By substituting the values into the equation, we find that the change in entropy is approximately 89.25 J/(mol·K). This means that for the crystallization of 1.25 moles of butane, the entropy decreases by 89.25 J/(mol·K).

Entropy is a measure of the disorder or randomness of a system. In this case, the crystallization process involves the transition from a disordered liquid state to an ordered solid state, resulting in a decrease in entropy. The magnitude of the entropy change depends on the enthalpy of fusion and the temperature. A higher enthalpy of fusion or a lower temperature leads to a larger change in entropy.

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Answer: 15 METERS IN A SECOND

Explanation: 54km = 54000m    54000m / 60 = 900    900/60 = 15

The mass of the Na₂SO₃ will produce is equal to 63.44 grams.

A  limiting reagent can be defined as the reactant in the reaction which is consumed during the completion of a reaction. The limiting reactant decides the amount of the product formed when the reactants are not taken in stoichiometry.

Given, chemical reaction of NaOH and sulfur dioxide is:

\(SO_2 + 2NaOH \longrightarrow Na_2SO_3 + H_2O\)

The mass of the sulfur dioxide = 38.7 g

The number of moles of SO₂ = 38.7/64 = 0.605 mol

The mass of the NaOH =  32.1 g

The number of moles of NaOH = 32.1/40 = 0.803 mol

The 2 moles of NaOH react with sulfur dioxide = 1 mol

Then 0.803 mol of NaOH reacts with sulfur dioxide = 0.803/2 = 0.401

Therefore NaOH is a limiting reagent.

The 0.803 moles of NaOH will produce Na₂SO₃ = 0.803/2 = 0.401 mol

The mass of the Na₂SO₃ = 0.401 × 158.11 = 63.44 g

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Answer:

A Orange juice contains particles of solid (pulp) as well as liquid; it is not chemically pure. C Because its composition is not uniform throughout, orange juice is a heterogeneous mixture

Explanation:

Orange  fruit is classified as a compound as it has many constituents.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

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Answer:

d) The fraction of collision with total kinetic energy larger than activation energy  increases.

Explanation:

Hello,

In this case, kinetic models explain how the rate of a chemical reaction is affected by several factors. In such a way, specifically for temperature, when it increases, the average velocity of the particles is also increased, for that reason, the collision frequency increases since the molecules are more likely to collide as they move faster and encounter to each other.

Nonetheless, it is the minor reason because the main reason is that the effective collisions increase when the temperature is increased, and they are related with the fraction of collision with total kinetic energy that turns out larger than the activation energy, therefore, answer is d).

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we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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The oxidation -reduction reaction among the given reactions is option b where, copper oxidizes and silver metal reduces.

A redox reaction is a type of reaction in  which a reactant species reduces whereas, another group oxidizes. The species which is oxidized is called oxidant and the one which is reduced is called the reductant.

Among the given reactions, the reaction between metallic copper with silver nitrate producing copper nitrate and silver metal is a redox reaction. Here, the copper metal gets oxidized to Cu²⁺ state by losing two electrons.

Silver nitrate gains two electrons forming the reduced state of silver metal and the metal deposits in the solution. Hence, option b is correct.

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Answer:

310 mL

Explanation:

Step 1: Given data

Step 2: Calculate the initial volume

We have a concentrated HBr solution and we want to prepare a diluted one. We can do so using the dilution rule.

C₁ × V₁ = C₂ × V₂

V₁ = C₂ × V₂ / C₁

V₁ = 0.400 M × 5.50 L / 7.10 M

V₁ = 0.310 L = 310 mL

Answer:

Matter is anything that has mass and takes up space. Mass gives an object the property of weight and inertia resistance to change in the motion of an object.

Explanation:Except for water, most liquids have particles which take up more space than they do when they are in their solid state.

Answer:

The higher up an object is the greater its gravitational potential energy. ... As most of this GPE gets changed into kinetic energy, the higher up the object starts from the faster it will be falling when it hits the ground. So a change in gravitational potential energy depends on the height an object moves through.

Answer:

The cell organelles are - Endoplasmic Reticulum, Ribosomes, Golgi apparatus,Lysosomes, Mitochondria, Plastids, Vacuoles, Peroxisomes and Centrosome.

Answer:

an aqueous solution of HNO3

✔ pH = 2.5

an aqueous solution of NaCl

✔ pH = 7

an aqueous solution of NaOH

✔ pH = 13

Explanation:

The answer is that the  pH will be <7 , =7 , >7 for the respective solutions.

pH is an expression of hydrogen ion concentration in water.

pH is the negative logarithm of hydrogen ion (H+) concentration (mol/L) in an aqueous solution:

pH = -log₁₀(H+)

The term is used to indicate basicity or acidity of a solution on a scale of 0 to 14, with pH 7 being neutral.

As the concentration of H⁺ ions in solution increases, acidity increases and pH gets lower, below 7

When pH is above 7, the solution is basic.

For the above solutions mentioned

1. An aqueous solution of HNO3

This will be an acidic solution so

pH < 7

2. An aqueous solution of NaCl

As NaCl is a salt therefore , it will be a neutral solution

pH=7

3. An aqueous solution of NaOH

This will be an alkaline solution

pH>7

Therefore the  pH will be <7 , =7 , >7 for the respective solutions.

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Answer:

ethyl ethanoate

Explanation:

it helps you

Answer:

Explanation:

The plant cell has a cell wall, chloroplasts, plastids, and a central vacuole—structures not found in animal cells. Plant cells do not have lysosomes or centrosomes.

Answer:

first you have to know the molecular formula of carbon which is C12H22O11, Then with that you can calculate the mass of each element in the molecule. C:12.01*12= 144.12, H: 1.008*22= 22.176, O: 16*11= 176

Explanation: give me brainliest pls

CuNO2 is a compound containing a polyatomic ion.

Define ionic compounds.

Positively charged ions, known as cations, and negatively charged ions, known as anions, make up ionic compounds, which are neutral substances. The name of the cation is written first, followed by the name of the anion, for binary ionic compounds (ionic compounds that only contain two kinds of elements).

A covalently bound collection of two or more atoms, or a metal complex, that can be said to act as a single entity and has a net charge that is not zero is referred to as a polyatomic ion. A polyatomic particle may or may not be referred to as a molecule. Salt is copper nitrate. Ionic interactions keep copper nitrate in place. The ionic framework of copper nitrate is very large.

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The factor that  doesn’t change the resistance of a wire is pressure. option A.

Resistance is a conductor's capacity to thwart the passage of current. It is controlled by the interplay of the applied voltage and the electric current passing through it. The amount of opposition any object applies to the flow of electric current is referred to as resistance.

The ohm, a unit of measurement for resistance, is represented by the Greek letter omega. According to Ohm's law, the voltage across two places is precisely proportional to the current flowing through a conductor between them.

Hence option A is correct.

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missing part;

The pressure

The length of the resistor.

The thickness of the resistor.

The temperature of the conductor.

Answer:

Calcium

Explanation:

Calcium is the only metal here

hope this helps...

A positive ion is an atom or a molecule that has a net positive charge. The charge of the proton in an atom or a molecule is positive.

A subatomic found in the atom or the molecule that lacks a positive charge is called an electron.

The correct answer is:

Option C. Calcium

This can be explained by:

Calcium is the only metal found in the given list and hence is the answer.

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Cu + O2 --->  CuO2 -The first reaction is a combustion reaction

2 HCl + Mg → H2 + MgCl2- The second reaction is a Single replacement reaction

A combustion reaction is a type of chemical reaction that occurs between a fuel and an oxidizer in the presence of heat or light, resulting in the release of energy in the form of heat and light.

In other words, it is a reaction in which a substance reacts with oxygen to produce heat and light.

Combustion reactions are important in many aspects of daily life, including the burning of fossil fuels for energy production, the combustion of wood or other materials for heating or cooking, and the combustion of fuels in internal combustion engines.

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Answer:

True

Explanation:

if not you can't support it

How do the products of chemical reactions compare to their reactants?

Answer:

The products often have completely different properties than the reactants.

The correct answer to the question is: The products often have completely different properties than the reactants.

In a chemical reaction, the reactants and products of the reaction have different properties because during the reaction, bonds were broken and new bonds were formed which generate a new substance called the product.

However, chemical equations must be balanced in order to conform to the law of conservation of matter which states that matter can neither be created nor destroyed  during a chemical reaction but can be transferred from one form to the other.    

For example, the reaction of Hydrogen gas (H₂) and oxygen gas (O₂) to produce water (H₂O)

From the equation, we can see that the reactants are gases but the product is a liquid which has a different properties from the gaseous reactants.

Therefore, the correct answer to the question is:  The products often have completely different properties than the reactants.

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Answer:

Sodium and Magnesium

Explanation:

The elements in Groups 1 and 2 get more reactive as you go down the group.

This means that Sodium is more reactive than lithium and Magnesium is more reactive than beryllium.

On the periodic table, as you go down the group, the reactivity of an element increases. Especially with metals in group 1 and 2. Now Lithium is a metal of group 1, followed by Sodium, while Beryllium is a metal in group 2, followed by magnesium. That's how I picked the answers