a reactant decomposes with a half-life of 139 s when its initial concentration is 0.331 m. when the initial concentration is 0.720 m, this same reactant decomposes with the same half-life of 139 s.
what is the order of the reaction?
a. 0
b. 1
c. 2
Answers
The order of the reaction is first order ( option b) because the half-life remains constant as the initial concentration changes.
The order of the reaction can be determined by analyzing the relationship between the half-life and the initial concentration.
The half-life is the amount of time it takes for the concentration of the reactant to decrease by half. In this case, the half-life remains constant at 139 s regardless of the initial concentration.
This suggests that the rate of the reaction depends only on the concentration of the reactant, which is a characteristic of a first-order reaction.
Therefore, the order of the reaction is option (b) 1. It useful in predicting the rate of the reaction and designing experiments to optimize reaction conditions.
For more such questions on reaction, click on:
https://brainly.com/question/29470602
#SPJ11
The order of the reaction is 1, as the half-life remains constant for different initial concentrations.
The half-life of a first-order reaction is independent of the initial concentration of the reactant. Therefore, since the half-life remains the same for the two different initial concentrations, the reaction must be first order. The rate constant (k) can be calculated using the formula t1/2 = ln(2)/k, where t1/2 is the half-life. Once k is found, it can be used to determine the rate equation, which in this case is rate = k[A]. Therefore, the order of the reaction is 1.
Learn more about reaction here :
https://brainly.com/question/28984750
#SPJ11
Related Questions
1A. All weak acids have _ than _
1B. All weak bases have _ than _
2A. All strong acids have _ than _
2B. All strong bases have _ than _
3. Group all the substances registered as a strong acid, with a ph of 1-2.
4. Group all the substances that registered as a strong base, with a ph of 13-14.
5. Group all the substances that registered as a weak acid, with a ph of 5-6.4
6. Group all the substances that registered as a weak base with a ph of 7.5-9
Answers
1. (A). All weak acids have a pH value that is higher than that of strong acids. Compared to strong acids, which dissociate completely and produce a higher concentration of H+ ions, resulting in a lower pH, weak acids partially dissociate in water, producing hydrogen ions (H+). produce a low concentration of K, leading to a high pH value.
B. All weak bases have a lower pH than strong bases. Compared to strong bases, which dissociate completely and form a higher concentration of OH- ions, weak bases receive fewer hydrogen ions from water, resulting in a lower concentration of hydroxide ions (OH-), As a result of which the pH value is reduced.
2. A. All strong acids are more acidic than weak acids in terms of pH. Compared to weak acids that only partially dissociate in water, strong acids dissociate completely, resulting in a larger concentration of H+ ions and a lower pH value.
B. All strong bases have pH values that are higher than those of weak bases. Compared to weak bases that only partially take up hydrogen ions, strong bases dissociate completely in water, producing a greater concentration of OH-ions and a higher pH value.
3. Hydrochloric acid (HCl), sulfuric acid (H2SO4), and nitric acid (HNO3) are some examples of substances that are listed as strong acids with a pH of 1-2.
4. Among others, sodium hydroxide (NaOH), potassium hydroxide (KOH), and calcium hydroxide (Ca(OH)2) are examples of substances classified as strong bases with a pH of 13–14.
5. Acetic acid (CH3COOH), formic acid (HCOOH), and carbonic acid (H2CO3), among others, can be classified as weak acids with a pH range of 5–6.4.
6. Ammonia (NH3), ammonium hydroxide (NH4OH), and methylamine (CH3NH2), among other substances, can be classified as weak bases with a pH range of 7.5 to 9.
Learn more about Acids, here:
https://brainly.com/question/29796621
#SPJ1
What organisms are not able to photosynthesize?
A. Grasses
B. Rabbits
C. Algae
D. Some bacteris
Answers
Answer:
B. Rabbits
For photosynthesis you need chlorophyll but rabbits don't have it.
How do the alveoli in the lungs move oxygen and nutrients into the bloodstream? 1.Gravity 4.Time 2.Diffusion 5.Pressure 3.Magnetic force
Answers
Answer:
2.Diffusion
Explanation:
As we metabolize certain nutrients for the correct functioning of our cells, carbon dioxide is produced as a result. We need oxygen in order to metabolize them, so we need to have a system to incorporate it, and to eliminate the carbon dioxide produced.
This system is provided by the interaction between the respiratory system, which allows the enter of oxygen into the body and gets rid of the carbon dioxide, and the circulatory system, which acts transporting carbon dioxide and oxygen to and from the lungs, respectively.
The surface available for the gaseous exchange is enlarged by the pulmonary alveoli. The alveoli are the terminal aerial spaces of the respiratory system and the structures where the exchange between the air and blood is produced. Each alveolus is surrounded by a net of capillaries, where oxygen is freed from the hemoglobin and moves into the cells by diffusion. Carbon dioxide, diffuses out of the cells into the capillaries, where most of it dissolves in the plasma of the blood.
Beryllium has an atomic number of 4. How many neutrons does the isotope beryllium-9 have?.
Answers
Answer: 5 neutrons
Explanation:
atomic number - number of protons in the nucleus
beryllium has mass number 9
mass number = number of protons + number of neutrons
9 = 4 + number of neutrons
number of neutrons = 9-4 = 5
What happens to the structure of the protein when the temperature rises above the functional level?
A
denatures
B
increases enzyme function
C
does not disrupt the protein structure
D
protein continues to function as normal
PLEASE HELP ASAP
Answers
Answer:
The correct answer is option A
Explanation:
The extreme temperatures lead to the unfolding of a polypeptide chain resulting in a change in composition and generally a loss of function. If the protein working as an enzyme denatures, it will make that protein to lose its enzymatic activity.
Answer:
Denatures
Explanation:proteins are very sensitive to temperature change
Click on the diagram to choose which atom is more reactive.
Answers
Answer:
Second graph is more reactive.
Explanation:
I just did the lesson myself, chose the first graph, and obviously got it wrong.
Therefore I can tell you with 100% certainty that the correct answer is graph #2 in this case. Hope this helps.
Which of the following is a result of the specific heat differences between land and ocean?
A. Ocean tides are created.
B. Volcanoes are created.
C. Saltwater is created.
D. Breezes are created.
Answers
how many moles of h2 are needed to react with 0.65 mol of n2 ?
Answers
The number of moles of H2 needed to react with 0.65 mol of N2 is 1.95 mol.
To determine how many moles of H2 are needed to react with 0.65 mol of N2, we need to use the balanced chemical equation for the reaction between N2 and H2 to form NH3
N2 + 3H2 → 2NH3
From the balanced chemical equation, we can see that for every 1 mole of N2, 3 moles of H2 are needed to fully react. Therefore, we can use the following equation to determine the number of moles of H2 needed:
moles of H2 = 3 × moles of N2
moles of H2 = 3 × 0.65 mol
moles of H2 = 1.95 mol
To learn more about Number of moles :
https://brainly.com/question/13314627
#SPJ11
if the exponent applied to the concentration of a in a rate law is equal to one, then that reaction must be:
Answers
If the exponent applied to the concentration of A in a rate law is equal to one, then that reaction must be a first-order reaction. In a rate law, the exponent represents the order of the reaction with respect to a specific reactant.
In a first-order reaction, the rate of the reaction is directly proportional to the concentration of A. This means that if the concentration of A doubles, the rate of the reaction will also double. Mathematically, the rate law for a first-order reaction can be represented as follows:
rate = k[A]
Here, [A] represents the concentration of A, k is the rate constant, and the exponent 1 indicates that the reaction is first-order with respect to A.
To further illustrate, let's consider an example. Suppose we have a reaction where the rate law is given as rate = k[A]. If the concentration of A is 2 M, and the rate of the reaction is 0.1 M/s, we can determine the rate constant as follows:
0.1 M/s = k * 2 M
Simplifying the equation, we find k = 0.05 1/s.
In conclusion, if the exponent applied to the concentration of A in a rate law is equal to one, it signifies a first-order reaction, where the rate is directly proportional to the concentration of A.
To know more about rate law visit:-
https://brainly.com/question/30379408
#SPJ11
Two large, nonconducting plates are suspended 5.61 cm apart. Plate 1 has an area charge density of +92.3μC/m2, and plate 2 has an area charge density of +19.1μC/m2. Treat each plate as an infinite sheet. How much electrostatic energy UE is stored in 1.54 cm3 of the space in region A ? UE= What volume V of the space in region B stores an equal amount of energy?
Answers
Two large, non conducting plates are suspended 5.61 cm apart. Plate 1 has an area charge density of +92.3 μC/m², and plate 2 has an area charge density of +19.1 μC/m².
The electrostatic energy UE is stored in 1.54 cm³ of the space in region A is 1.588 x 10⁻⁹ J.
The volume V of the space in region B stores an equal amount of energy is 1.541 x 10⁻⁶ m³.
To calculate the electrostatic energy stored in a given volume of space, we need to determine the electric field and then use it to calculate the energy density. The energy stored in a volume is given by the product of the energy density and the volume.
Distance between the plates (d): 5.61 cm
Charge density of plate 1 (σ₁): +92.3 μC/m²
Charge density of plate 2 (σ₂): +19.1 μC/m²
Volume in region A: 1.54 cm³
First, let's calculate the electric field between the plates:
The electric field between two infinite parallel plates with uniform charge densities is given by:
E = (σ₁ - σ₂) / (2ε₀)
where ε₀ is the permittivity of free space (ε₀ = 8.85 x 10⁻¹² C²/(N m²)).
Substituting the given values, we have:
E = (92.3 x 10⁻⁶ C/m² - 19.1 x 10⁻⁶ C/m²) / (2 x 8.85 x 10⁻¹² C²/(N m²))
E = 5.509 x 10⁶ N/C
Next, let's calculate the electrostatic energy stored in 1.54 cm³ of space in region A:
The energy density (u) is given by:
u = (1/2) ε₀ E²
Substituting the value of E we calculated earlier, we have:
u = (1/2) x 8.85 x 10⁻¹² C²/(N m²) x (5.509 x 10⁶ N/C)²
u = 1.031 x 10⁻³ J/m³
To calculate the energy (UE) stored in the given volume in region A, we multiply the energy density by the volume:
UE = u x V
UE = 1.031 x 10⁻³ J/m³ x 1.54 x 10⁻⁶ m³
UE = 1.588 x 10⁻⁹ J
Therefore, the electrostatic energy stored in 1.54 cm³ of space in region A is 1.588 x 10⁻⁹ J.
To determine the volume (V) in region B that stores an equal amount of energy, we rearrange the equation:
V = UE / u
V = 1.588 x 10⁻⁹ J / 1.031 x 10⁻³ J/m³
V = 1.541 x 10⁻⁶ m³
Therefore, a volume of 1.541 x 10⁻⁶ m³ in region B stores an equal amount of electrostatic energy.
To know more about non conducting plates here
https://brainly.com/question/33381740
#SPJ4
ion channel associated with the ampa receptor is permeable to
Answers
The ion channel associated with the NMDA receptor is permeable to calcium (Ca²⁺), while the ion channel associated with the AMPA receptor is permeable to sodium (Na⁺).
Determine the NMDA receptor?The NMDA receptor is a type of glutamate receptor found in the central nervous system (CNS) that plays a crucial role in synaptic plasticity and learning.
When glutamate, the primary excitatory neurotransmitter, binds to the NMDA receptor, it allows the influx of calcium ions (Ca²⁺) into the postsynaptic neuron.
Calcium entry through the NMDA receptor is important for long-term potentiation (LTP), a process involved in strengthening synaptic connections and facilitating learning and memory.
On the other hand, the AMPA receptor is also a type of glutamate receptor that mediates fast synaptic transmission in the CNS.
When glutamate binds to the AMPA receptor, it opens an ion channel that is permeable to sodium ions (Na⁺), leading to depolarization of the postsynaptic membrane and generation of an excitatory postsynaptic potential (EPSP).
This EPSP can trigger the firing of an action potential in the postsynaptic neuron, allowing for the transmission of signals between neurons.
Therefore, the NMDA receptor's ion channel allows the passage of calcium (Ca²⁺), while the AMPA receptor's ion channel permits the flow of sodium (Na⁺).
To know more about NMDA receptor, refer here:
https://brainly.com/question/30115572#
#SPJ4
Complete question here:
The ion channel associated with the NMDA receptor is permeable to ____ while the ion channel associated with the AMPA receptor is permeable to a. iron; sodium b. glutamate; potassium C. calcium, sodium and potassium; sodium d. calcium and selenium, potassium and sodium e. calmodulin; glutamate
PLEASEEE HELPPP I SUCK AT CHEM :(
a 0.100M H2SO4 solution is neutralised with 10.00ml of a solution of 0.300M KOH
a) write a balanced equation for this reaction
b) what volume of sulfuric acid was neutralised
Answers
Answer:
a) H2SO4 + 2KOH -> 2H2O + K2SO4
b) 9.809 ml
Explanation:
Number of Moles = Mass/ Molar Mass
Therefore: Mass = Number of moles * Molar Mass
--------------------------------------------
Molar mass of H2SO4:
H2= 2.02
S= 32.07
O4= 64
--------------------------------------------
H2SO4 has the molar mass of 98.09
--------------------------------------------
the Moles of H2SO4 is given to be 0.100M
Therefore:
Mass= 98.09*0.1
= 9.809g
---------------------------------------------------
Assuming that 1 g= 1 ml, the volume of sulfuric acid is 9.809 ml.
When the carbonic acid sodium bicarbonate buffer pair buffers lactic acid?
Answers
When the carbonic acid sodium bicarbonate buffer pair buffers lactic acid, the following reaction occurs:$$\text{HCO}_3^- + \text{H}^+ \leftrightarrow \text{H}_2\text{CO}_3$$The carbonic acid/bicarbonate buffer system is one of the most important in human blood. When the pH of the blood decreases (becomes more acidic), the amount of bicarbonate ions in the blood decreases, and the concentration of hydrogen ions increases.
A buffer is a solution of a weak acid and its conjugate base that prevents changes in pH when small amounts of strong acid or base are added. Buffer systems protect organisms from pH changes by regulating and neutralizing acids and bases that enter or are produced by cells.
When the carbonic acid sodium bicarbonate buffer pair buffers lactic acid, the following reaction occurs:$$\text{HCO}_3^- + \text{H}^+ \leftrightarrow \text{H}_2\text{CO}_3$$The carbonic acid/bicarbonate buffer system is one of the most important in human blood. When the pH of the blood decreases (becomes more acidic), the amount of bicarbonate ions in the blood decreases, and the concentration of hydrogen ions increases. To balance the excess hydrogen ions, carbonic acid (H2CO3) is formed from carbon dioxide (CO2) and water (H2O). Carbonic acid then decomposes to form bicarbonate ions and hydrogen ions, and the pH of the blood is returned to normal. The bicarbonate ions act as a base, neutralizing the excess hydrogen ions that cause the blood to become more acidic. This is called the bicarbonate buffer system. Lactic acid is produced during intense exercise when the body doesn't get enough oxygen to meet its energy needs. The buildup of lactic acid in muscles can cause fatigue and muscle soreness. The carbonic acid/bicarbonate buffer system can also help to buffer the excess lactic acid produced during exercise, preventing the blood from becoming too acidic.
To know more about sodium bicarbonate visit :
brainly.com/question/8506770
#SPJ11
a Use carbon's position in the Periodic Table to explain why carbon normally
forms four covalent bonds.
Answers
The trivial answer is that a carbon atom that forms 4 covalent bonds is in a lower energy state that one that forms 2. But what happens when this occurs? Carbon's valence shell is configured 2s2 2p2 (remember the p shell can contain up to 6 electrons, in a 3-D 2px, 2py, 2pz shape). Two half-filled p orbitals should mean stable molecules like CH2 - the 2 electrons from the H filling the 2px and 2py subshells. But....these don't normally exist ...instead carbon likes to form 4 covalent bonds with other atoms.
Summary
* Carbon forms covalent bonds with atoms of carbon or other elements. There is a great diversity of carbon compounds, ranging in size from just one to thousands of atoms.
* Carbon has four valence electrons, so it can achieve a full outer energy level by forming four covalent bonds. When it bonds only with hydrogen, it forms compounds called hydrocarbons.
* Carbon can form single, double, or triple covalent bonds with other carbon atoms.
What is the energy change per gram of ice when an iceberg composed of pure water, cp = 2.06 J/(g·K), is heated from 25°C to 15°C?
A. 21 J
B. 0.21 J
C. 210 J
D. It is impossible to calculate without knowing the mass of the iceberg
Answers
Answer:
A. 21 J
Explanation:
Your temperature change is 10 degrees Celsius, or 10 Kelvin, it makes no difference either way.
Cp = 2.06 J/g•K
Multiply by the temperature change to just get J/g
2.06 J/g•K • 10 K = 20.6 J/g ≈ 21 J/g
21 J is the energy change per gram of ice when an iceberg composed of pure water, cp = 2.06 J/(g·K) which is heated from 25°C to 15°C. So, the correct option is A.
What is Heat?Heat is defined as the energy that is transferred from one body to another as a result of a difference in temperature, when two bodies at different temperatures are brought together, the energy transferred is that of the hotter body which flows towards the colder body.
In this case, according to the equation for the calculation of the heat during a heating process
\(Q= mC (T_f- T_i)\)
It is possible to calculate mass per gram of ice by dividing both sides by removing m from the equation, we plug in the given specific heat and final and initial temperatures to get:
\(Q= 2.06 \frac{J}{g degree C} [-15 Degree C- (-25 Degree C]\)
\(Q= 20.6\frac{J}{g}\) which is equals to 21° C
21 J is the energy change per gram of ice when an iceberg composed of pure water, cp = 2.06 J/(g·K) which is heated from 25°C to 15°C.
Therefore, the correct option is A.
Learn more about Heat, here:
https://brainly.com/question/30603212
#SPJ6
why is the air along a coastline typically cooler than in other areas?
Answers
Answer:
ocean heats up and cools down relatively slowly. Therefore, areas near the ocean generally stay cooler
Without the atmosphere, life on Earth would not be possible. Which of the following is NOT an explanation for how Earth’s atmosphere protects life on the planet?
A. It allows visible light to pass through completely.
B. It contains gases that filter out ultraviolet radiation.
C. It keeps Earth warm by trapping in heat.
D. It protects life from ultraviolet rays of light
Answers
Answer:
B
Explanation:
IM A CHEMISTRY WIZZZZ
:)
I hope u get full marks on your paper/test/quiz or whatever!
There is a 20 percent chance so stay positive!
Answer:
D
Explanation: ultraviolet rays are harmful to humans
How can the arrangement of atoms help explain how the white phosphorous and red phosphorous can both be pure phosphorous substances? Cite your evidence
Answers
Answer:
white phosphorus is P4 in a tetrahedral shape and there are some really cool videos of it reacting in air and some not very cool ones where it was used militarily it is not stable, it needs to be stored underwater
red phosphorus is a larger more complicated network solid with many more phosphorus and is very stable
they are allotropes of phosphorus
Explanation:
0.10 moles of sodium sulfate is dissolved into 12 mL of solution. What is the molar concentration of the solution?
Your answer should have two significant figures (round your answer to one decimal place).
Answers
the molar concentration should be atleast 5mL off the solution since its disolved
Answer:
8.3
Explanation:
Convert mL to L.
12 mL×1 L1000 mL=0.012 L
Solve for molarity.
Molarity=moles of solute
liters of solution=0.10 mol0.012 L=8.3 M
A cell with a 10% salt concentration inside it is placed into a solution. The cell begins to shrink. What is a possible concentration of salt outside the cell
Answers
Given what we know, we can confirm that the concentration of salt outside the cell was above 10%.
How can we know the external salt concentration?This has to do with osmosis. Osmosis is the tendency of water to move towards a place with a higher concentration of solute. This is because of water's role as a solvent. The cell in this case shrinks because the water leaves the cell to dissolve the outside salt concentration, which tells us that it must be higher than 10%.
Therefore, we can confirm that the cell shrinks because water leaves the cell to dissolve the outside salt concentration, meaning that the outside concentration of salt is higher than 10%.
To learn more about osmosis visit:
https://brainly.com/question/21395644?referrer=searchResults
True or False: Sulfur by itself isn't too bad, it's when it reacts with other elements that it can become dangerous
Answers
Answer:sulfer by itself is not pleasant and it can be dangerous by itself but in large amounts.
Explanation:
Answer:
True.
Explanation:
Also did you know that it is combined with chlorine that it becomes salt? Cool right? Two deadly things combining to become a condiment
In the coumarin lab, you used DOWEX 50WX4 beads during the Pechmann synthesis. What was the purpose of the beads?
To induce precipitation of the product
To absorb any unreacted starting materials
To act as a proton source
To act as a hydroxide source
For extracting the coumarin product
Answers
The purpose of using DOWEX 50WX4 beads in the coumarin lab during the Pechmann synthesis was to act as a proton source. DOWEX 50WX4 is a cation exchange resin that contains sulfonic acid functional groups. These acidic groups can donate protons (H+) to the reaction mixture, promoting the acid-catalyzed cyclization of resorcinol and an ester to form coumarin.
During the Pechmann synthesis, the reaction mixture typically contains an ester, resorcinol, and a strong acid catalyst. The DOWEX 50WX4 beads help to maintain an acidic environment by releasing protons, which facilitate the reaction and promote the formation of the desired product, coumarin.
The beads do not induce precipitation of the product or act as a hydroxide source. Additionally, they are not used for extracting the coumarin product. Their main role is to provide acidic conditions by acting as a proton source in the reaction mixture.
You can learn more about Salicylic acid, visit:
brainly.com/question/14635153
#SPJ11
A(n) _____ is a hydrocarbon in which one or more hydrogen atoms is replaced by a -COOH and a -NH2 group. aldehyde carboxylic acid alcohol amino acid
Answers
Answer:
Amino Acid
Explanation:
It's part of the Amino group, which are substituted hydrocarbons.
When NH₂ and COOH replaces hydrogens on the same carbon atom in a molecule, an Amino acid is formed.
What group is a COOH?
COOH : a Carboxylic Acid group!
Which of these oceans remain frozen accept for part of the year, when the edges melt?
Pacific
Southern
Atlantic
Indian
Artic
Answers
Answer:
artic is correct please give brainliest please??
sodium atoms contain 11 protons and 11 electrons with a mass of approximately 23. the atomic number of sodium is therefore:
Answers
jowl is a derived unit give reason
Answers
Answer:
Explanation:
Joule is the unit of energy and work done.
It is a derived quantity because it is not a fundamental or basic unit.
A derived unit is formed by the combination of two or more fundamental quantities.
Since work done = Force x distance
Force = mass x acceleration
= mass x acceleration x distance
The unit then becomes kgm²/s²
So, 1joule = 1kgm²/s²
A process by which softer, less weather-resistant rocks wear away and leave harder, more weather-resistant rocks behind is called a. differential weathering. c. chemical weathering. b. mechanical weathering. d. ice wedging.
Answers
Answer:
geosphere
Explanation:
Answer:
differential weathering.
Explanation:
What is the importance of o2 and co2?
Answers
The importance of the O₂ and CO₂ is the O₂ is used for respiration in all living things. CO₂ is greenhouse gas.
The O₂ is used for respiration in all living things. CO₂ is greenhouse gas. In respiration the O₂ plays an very important . the O₂ helps the organism to grow and reproduce. human needs oxygen for breathing. The importance of the O₂ and CO₂ dissolve in water is very important for aquatic life. The CO₂ is very important for the regulation of the earth's temperature.
Thus, the O₂ and CO₂ gas plays a very vital role in the life of living thing.
To learn more about O₂ and CO₂ here
https://brainly.com/question/13381473
#SPJ4
NEED HELP FAST PLS HELP!!!!
URGENT
Which two factors can affect a
solid solute's solubility?
A. Length of time spent stirring
B. Pressure acting on the solute
O C. Temperatures of the solvent and solute
D. Whether the particles of the solute and solvent are charged
Answers
Answer:
I think is B and C
Explanation:
There are two direct factors that affect solubility: temperature and pressure.Temperature affects the solubility of both solids and gases, but pressure only affects the solubility of gases.
Answer:
Explanation:
It is c and d promise took test.
the element which makes up the framework of organic compounds and which cycles through all ecosystems is____
Answers
The element which makes up the framework of organic compounds and which cycles through all ecosystems is carbon.
An organic compound is a compound that, in general, contains carbon covalently bound to other atoms, especially Carbon-Carbon (C-C) and Carbon-Hydrogen (C-H) (such as in hydrocarbons). A chemical compound refers to any substance made up of two or more elements that are chemically bonded together. Carbon is a key component of organic compounds, as it forms the basis for complex structures such as carbohydrates, proteins, lipids, and nucleic acids. It cycles through ecosystems via processes like photosynthesis, respiration, and decomposition, playing a crucial role in the carbon cycle.
Learn more about organic compounds: https://brainly.com/question/5994723
#SPJ11