Answer:
Chemical reactions proceed at different rates. The factors that affect reaction rates are:
surface area of a solid reactant
concentration or pressure of a reactant
temperature
nature of the reactants
presence/absence of a catalyst.
A change in one or more of these factors may alter the rate of a reaction. In this lesson, you will define these factors, and describe and predict their effects on reaction rates.
Surface Area
Surface area is the exposed matter of a solid substance.
Imagine that you are holding a perfect cube of magnesium. The surface area is the sum of the area of all six sides of the cube. The surface area of the cube can be increased by dividing the cube into smaller cubes. Surface area is maximized when a single large cube is crushed to fine powder.
The rate of reaction of a solid substance is related to its surface area. In a reaction between a solid and an aqueous/liquid/gas species, increasing the surface area of the solid-phase reactant increases the number of collisions per second and therefore increases the reaction rate.
In a reaction between magnesium metal and hydrochloric acid, magnesium atoms must collide with the hydrogen ions. When the magnesium atoms form one big lump...
The concentration of a gas is a function of the pressure on the gas. Increasing the pressure of a gas is exactly the same as increasing its concentration. If you have a certain number of gas molecules, you can increase the pressure by forcing them into a smaller volume.
Under higher pressure or at a higher concentration, gas molecules collide more frequently and react at a faster rate. Conversely, increasing the volume of a gas decreases pressure which in turn decreases the collision frequency and thus reduces the reaction rate.
It is important to note however that there are reactions involving gases in which a pressure change does not affect the reaction rate. For this reason, the rates of reactions involving gases have to be determined by experiment.
Also note that solids and liquids are not affected by pressure changes.
Need a good analogy for the effect of concentration on the rate of a chemical reaction?
Temperature
With the exception of some precipitation reactions involving ionic compounds in solution, just about all chemical reactions take place at a faster rate at higher temperatures. The question is why?
Temperature (in Kelvin degrees) is proportional to the kinetic energy of the particles in a substance. For example, if the Kelvin temperature of a substance is doubled, then the average kinetic energy of the particles in that substance is doubled.
At higher temperatures, particles collide more frequently and with greater intensity.
Here's an analogy.
Imagine that you are baby-sitting a bunch of 6 year olds. You put them in a yard and you let them run around. Every now and then a couple of kids will run into each other. Now imagine that you decide to feed them some sugar. What happens? They run around faster and of course there are many more collisions. Not only that, the collisions are likely to be a lot harder/more intense.
Now, let's look at the effect graphically. Recall that in any sample of matter (the example we used previously was a gas), individual particles have different kinetic energies. Some are moving fast some are moving slowly, and most are moving at some intermediate speed.
Increasing the temperature by say 10°C causes some of the intermediate speed molecules to move faster. The result is more molecules with sufficient kinetic energy to form an activated complex upon collision!
Now consider the relationship between threshold kinetic energy and activation energy. Threshold kinetic energy is the minimum amount of energy required for colliding particles to react - it is the equivalent of activation energy or the minimum potential energy gain required to form an activated complex.
As you can see on the graph, a small increase in temperature can double the number of molecules with the threshold kinetic energy.
Thus there are two effects of increasing temperature: greater collision intensity and more frequent collisions.
A general rule is that a 10°C temperature increase can double a reaction rate. It turns out that the increase in the reaction rate is mainly a function of the more intense collisions. Increased collision frequency is not as significant a factor.
Explanation:
H2(g), I2(g), and HI(g) are at equilibrium at a different temperature in a different vessel. (c) When the temperature in the vessel is decreased, does the equilibrium shift to the right, favoring the product, or to the left, favoring the reactants? Justify your answer. Rigid vessel
Answer:
The reaction will shift rightwards favoring the product.
Explanation:
Hello,
In this case, considering the chemical reaction to be:
[tex]H_2(g)+I_2(g)\rightleftharpoons 2HI(g) ;\Delta H^o rxn=-9.4kJ/mol;Kc=49[/tex]
We notice that the sign of the change in the enthalpy of the reaction is negative, therefore this an exothermic chemical reaction in which the heat is a product as the reaction vessel heats up as the reaction undergoes. In such a way, by decreasing the temperature we are removing heat and by means of the Le Chatelier's principle, when removing a product, the reaction will shift rightwards favoring the product, HI.
Best regards.
Answer:
the balance will shift to the right, favoring the products. More HI will be formed.
Explanation:
Step 1: Data given
H2(g), I2(g), and HI(g) are at equilibrium at a different temperature in a different vessel.
Step 2: The balanced equation
H2(g) + I2(g) ⇆ 2HI(g)
Step 3:
If the temperature is increased, the system will release less heat as reaction.
Since formation of HI is exothermic
When the temperature drops, the system will produce more heat. With the result, the balance will shift to the right, favoring the products. More HI will be formed.
SbF5 mass ratio and atomic ratio
Answer:
SbF5
Mass ratio = 1.28 : 1
And atomic ratio = 1 : 5
A 150 mL sample of hydrochloric acid (HCl) completely reacted with 60.0 mL of a 0.100 M NaOH solution. The equation for the reaction is given below.
[tex]HCl + NaOH \rightarrow NaCl + H_2O[/tex]
What was the original concentration of the HCl solution?
Answer: 0.0400 M
Explanation:
[tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]
To calculate the volume of acid, we use the equation given by neutralization reaction:
[tex]n_1M_1V_1=n_2M_2V_2[/tex]
where,
[tex]n_1,M_1\text{ and }V_1[/tex] are the n-factor, molarity and volume of acid which is [tex]H_2SO_4[/tex]
[tex]n_2,M_2\text{ and }V_2[/tex] are the n-factor, molarity and volume of base which is NaOH.
We are given:
[tex]n_1=1\\M_1=?\\V_1=150mL\\n_2=1\\M_2=0.100M\\V_2=60.0mL[/tex]
Putting values in above equation, we get:
[tex]1\times M_1\times 150=1\times 0.100\times 60.0\\\\M_1=0.0400M[/tex]
Thus the original concentration of the HCl solution is 0.0400 M
PLEASE HELP ASAP BRAINLIEST!!!
A student needs to convert a pressure of 2.3 atm to kpa. What conversion factor should the student use?
Answer:
101.3 kPa / 1 atm (first choice)
Explanation:
1 atm = 101.3 kPa, so to convert atm to kPa, just multiply the given value by 101.3 kPa.
Hope this helps
Nitrogen gas has the chemical formula N2. One molecule of nitrogen gas is made up of
A.
one atom of nitrogen and one atom of oxygen.
B.
two atoms of nitrogen and one atom of oxygen.
C.
two atoms of nitrogen.
D.
one atom of nitrogen.
Nitrogen gas has the chemical formula N2. One molecule of nitrogen gas is made up of two atoms of nitrogen.
The correct option is C.
Explanation:
Nitrogen gas has the chemical formula [tex]N_{2}[/tex], which means that two atoms of nitrogen element combined to form nitrogen gas.
The combination of two atoms of element nitrogen produce dinitrogen atom.
Dinitrogen is the nitrogen gas usually present in atmosphere of the earth in abundance.
2 atoms of nitrogen element
N + N = [tex]N_{2}[/tex]
the gas is colorless and odorless formed at standard condition of temperature and pressure. The two nitrogen atoms are tightly bonded with triple bonds in between the atoms.
One molecule of nitrogen gas is made up of C. Two atoms of nitrogen.
Nitrogen gas, with the chemical formula N₂, consists of molecules that each contain two nitrogen atoms bonded together. The formula N₂ indicates that the gas is diatomic, meaning it is composed of pairs of nitrogen atoms. Each molecule of nitrogen gas has no oxygen atoms and consists solely of nitrogen.
The molecular formula N₂ reflects the fact that nitrogen naturally forms a diatomic molecule in its elemental state. This diatomic nature is due to the strong triple bond between the two nitrogen atoms, which is the most stable configuration for nitrogen in its gaseous form.
Lisa needs to buy a helium tank to fill up all the balloons. If the helium must be compressed from an original volume of 27.0L at 14.7 psi, down to a volume of 3.00L, what would be the final pressure of the helium?
Answer:
[tex]P_2=135.73psi[/tex]
Explanation:
Hello,
In this case we use the Boyle's law which allows us to understand the volume-pressure behavior as an inversely proportional relationship:
[tex]V_1P_1=V_2P_2[/tex]
Whereas we solve for [tex]P_2[/tex] as the required final pressure:
[tex]P_2=\frac{V_1P_1}{V_2} =\frac{27.0L*14.7psi}{3.00L}\\ \\P_2=135.73psi[/tex]
Best regards.
Suppose we have two rock samples, A and B. If rock A was subject to both physical and chemical weathering while rock B was subject to chemical weathering only. Which rock would experience more chemical weathering? why?
Answer:
Rock A because after physical weather and chemical weathering it more likely for Rock A to experience more chemical weathering.
Explanation: Weathering: This is a geological term used to describe the various processes and Activities involved in the breaking down of rocks either through physical,mechanical,chemical etc actions into smaller particles.
ROCK A WILL HAVE MORE CHEMICAL WEATHERING BECAUSE THE PHYSICAL WEATHERING MUST HAVE BROKEN DOWN THE PARTICLES FOR EASY WATER AND OTHER SUBSTANCE NEEDED FOR EASIER CHEMICAL REACTION OR WEATHERING.
A 6.0M solution HCl is diluted to 1.0M How many milliliters of the 6.0M solution would be used to prepare 100.o mL of the diluted 1.0M solution ?
Answer:
The answer to your question is Volume 1 = 16.7 ml
Explanation:
Data
[HCl] 1 = 6.0 M
Volume 1 = ?
[HCl] 2 = 1.0 M
Volume 2 = 100 ml
Process
To solve this problem use the dilution formula
[HCl] 1 x Volume 1 = [HCl] 2 x Volume 2
-Solve for Volume 1
Volume 1 = [HCl] 2 x Volume 2 / [HCl] 1
-Substitution
Volume 1 = 1 x 100 / 6
-Simplification
Volume 1 = 100/6
-Result
Volume 1 = 16.7 ml
CH4 is the ___________________ formula for methane.
A) Lewis
B) covalent
C) molecular
D) structural
CH₄ is the molecular formula for methane. The correct option is (C) molecular.
To answer the question, let's first understand what the different terms mean:
Lewis structure: A diagram that shows the covalent bonds and lone pairs of electrons in a molecule.Covalent: Refers to a type of chemical bond where pairs of electrons are shared between atoms.Molecular formula: Indicates the types and numbers of atoms in a molecule (e.g., CH₄ for methane).Structural formula: Shows how atoms are arranged and bonded in a moleculeThis means that CH₄ indicates the composition of a methane molecule, showing it consists of one carbon atom and four hydrogen atoms. It does not show how the atoms are bonded or arranged.
1. Draw the basic repeating unit of sodium alginate polymer. 2. What is this polymer used for?
Answer:
1.The diagram is attached
2.sodium alginate is a polymer which can be extracted from brown seaweed and is used for defloculating, gelling and thickening
Used also in dermatological preparation
Used in adhensive paste
Sodium alginate polymer is used in the food industry as a stabilizer for ice cream, yogurt, cream, and cheese.
A polymer is obtained by the agglomeration of small molecules called monomers. Monomers are the simple units from which polymers are formed the units that compose the sodium alginate polymer shown in the image attached to this answer are called monomers.
Sodium alginate is obtained from brown seaweed and is useful in the food industry as a stabilizer for ice cream, yogurt, cream, and cheese.
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The following reaction is performed: 3H₂ + N₂ → 2NH₃ . You begin this reaction with 10.00 grams of each reactant. What is the theoretical mass of ammonia (NH₃) that can be formed
The theoretical mass of ammonia is 56.6 grams when reaction is begun with 10.00 grams of each reactant.
Explanation:
Data given:
mass of reactants = 10 gram
The reactants are hydrogen and nitrogen gas.
Theoretical mass of ammonia =?
balanced chemical reaction is :
3 [tex]H_{2}[/tex] + [tex]N_{2}[/tex] ⇒ 2 N[tex]H_{3}[/tex]
Atomic mass of hydrogen gas = 2 grams/mole
atomic mass of nitrogen gas = 28 grams/mole
number of moles of each reactant is determined:
number of moles = [tex]\frac{mass}{atomic mass of 1 mole}[/tex]
putting the values for hydrogen gas
number of moles = [tex]\frac{10}{2}[/tex]
number of moles = 5
number of moles of nitrogen gas = [tex]\frac{10}{28}[/tex]
= 0.35 moles
from the balanced equation,
3 moles of hydrogen gas reacted to give 2 moles of ammonia
5 moles of hydrogen will give x moles
[tex]\frac{2}{3}[/tex] = [tex]\frac{x}{5}[/tex]
3x =10
x = 3.33 moles
mass of ammonia produced = number of moles x atomic mass
= 3.33 x 17
= 56.61 grams of ammonia produced from hydrogen
For nitrogen gas,
1 mole nitrogen gas reacted to give 2 moles of ammonia gas
0.35 moles will give x moles
[tex]\frac{2}{1} =\frac{x}{0.35}[/tex]
x = 0.7 moles of ammonia formed
mass = number of moles x atomic mass
= 0.7 x 17
= 11.9 grams
Thus the limiting reagent is hydrogen gas in the reaction.
The mass from limiting reagent is called theoretical yield = 56.61 grams
The freezing point of a substance is always _____ the melting point of that substance.
A.) lower than
B.) higher than
C.) the same as
D.) it depends on what the substance is.
Answer:
a
Explanation:
Answer:
freezing point is any temperature in which a substance turns into ice and melting point is the point in which a substance changes into liquid from ice..So, the correct ans is A(lower than)
What is the term used to describe the equilibrium constant for the autoionization of water?
Answer: The term used to describe the equilibrium constant for the autoionization of water is ION-PRODUCT CONSTANT of liquid water (Kw).
Explanation:
Autoionization of water can also be called self ionisation in which water molecules undergoes dehydronation reaction( which is reversible) to form hydroxide ion and hydronium ion. This helps to describe water as amphiprotic because it acts as an acid by donating a proton to a base to form the hydroxide ion or as a base by accepting a proton from an acid to form the hydronium ion.
Hence, the equilibrium constant for the autoionization of water is ION-PRODUCT CONSTANT of liquid water (Kw). At 25°C Kw = 1.01× 10-¹⁴.
Final answer:
The equilibrium constant for the autoionization of water is the ion-product constant for water, symbolized as Kw, with a value of 1.0 × 10-14 at 25 ℃.
Explanation:
The equilibrium constant for the autoionization of water is called the ion-product constant for water, and it is given the symbol Kw. The autoionization reaction can be represented as: H2O(l) = H+ (aq) + OH- (aq), and the respective Kw = [H+][OH-]. At 25 ℃, Kw has a value of 1.0 × 10-14. This reaction is an example of autoionization, where like molecules react to yield ions. The value of Kw is temperature-dependent and increases with rising temperatures. For instance, at 100 ℃, the value of Kw is about 5.6 × 10-13, which is significantly larger than at room temperature.
Magnesium and hydrochloric acid combine in the reaction described by this equation: Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) In a laboratory experiment 45.0 g Mg is reacted with excess HCl. What is the theoretical yield? (Note: The molar masses are Mg = 24.3 g/mol; MgCl2 = 95.2 g/mol.)
Answer:
m = 176.12 g
Explanation:
Let's write the reaction again:
Mg(s) + 2HCl(aq) --------> MgCl₂(aq) + H₂(g)
This reaction is a simple displacement reaction, in this case, the magnesium is displacing the atoms of hydrogens to form MgCl₂. 1 mole of Mg reacts with 2 moles of HCl. If the magnesium is the limiting reactant, we need to calculate the theorical yield of MgCl₂. The mole ratio between these two is 1:1 so, all we have to do is calculate the moles of magnesium and then the moles of MgCl₂:
moles Mg = 45 / 24.3 = 1.85 moles
As the mole ratio is 1:1 then:
moles Mg = moles MgCl₂ = 1.85 moles
Now, we calculate the mass using the molecular mass:
m = 1.85 * 95.2
m MgCl₂ = 176.12 gThis is the theorical yieldThe theoretical yield of MgCl₂ obtained from the reaction is 176.3 g
We'll begin by calculating the mass of the Mg that reacted and the mass of MgCl₂ produced from the balanced equation.
Mg(s) + 2HCl(aq) —> MgCl₂(aq) + H₂(g)
Molar mass of Mg = 24.3 g/mol
Mass of Mg from the balanced equation = 1 × 24.3 = 24.3 g
Molar mass of MgCl₂ = 95.2 g/mol
Mass of MgCl₂ from the balanced equation = 1 × 95.2 = 95.2 g
SUMMARY:
From the balanced equation above,
24.3 g of Mg reacted to produce 95.2 g of MgCl₂
Finally, we shall determine the theoretical yield of MgCl₂.From the balanced equation above,
24.3 g of Mg reacted to produce 95.2 g of MgCl₂
Therefore,
45 g of Mg will react to produce = (45 × 95.2)/24.3 = 176.3 g of MgCl₂
Thus, the theoretical yield of MgCl₂ is 176.3 g
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What is the pH of a solution with an [H+] = 4.73x10^-7 M
Answer:
The answer to your question is pH = 6.3
Explanation:
Data
pH = ?
[H⁺] = 4.73 x 10⁻⁷ M
pH is the measure of the concentration of [H⁺]. pH measures the acidity of the solution. If the value of pH is between 0 and 6.9, the solution is an acid. If the pH is 7.0 the solution is neutral and if the pH is between 7.1 and 14, the solution is an alkali.
Formula
pH = -log[H⁺]
Substitution
pH = -log[4.73 x 10⁻⁷]
-Simplification
pH = - (-6.3)
-Result
pH = 6.3
It's January in Nashville and your local weather station just informed you that the temperature outside is
15.4°F. You estimate the amount of ice on your driveway to be approximately 30 kg. What is the minimum amount
of sodium chloride in kilograms (kg) needed to lower the freezing point of the water so that the ice melts?
3.84 Kg of sodium chloride is needed to lower the freezing point of the water so that ice melts.
Explanation:
Data given:
mass of ice = 30 Kg
molar mass of NaCl = 58.5 grams/mole
ΔT(depression in freezing point) = 15.4 F or - 9.22 degrees
Kf = 1.86 degree C/ mole
Molality = ?
mass of NaCl =?
i = 2 (because NaCl breaks into 2 ions)
ΔT = iKfm equation 1
Depression in freezing point when ice melts, the temperature is 0 degrees so
the depression in temperature = 9.22 degrees
putting the values in the equation:
9.22 = 2 x 1.86 x [tex]\frac{mass}{58.5}[/tex] x[tex]\frac{1}{30}[/tex]
mass = 3.84 kg of NaCl will be required to lower the freezing point of the water so that the ice melts.
Scoring Scheme: 3-3-2-1 Part III. For each trial, enter the amount of heat gained by the chemical system of ammonium nitrate, qrxn. The specific heat of water is 4.184 J/goC. Report your answer using 4 digits. Trial
Question:
The information given is:
Trial # Tiwater T f ΔT Masswater (m)
#1: 21.2 10.8 10.8 24.990
#2: 20.8 9.50 9.5 25.000
#3: 20.9 9.20 9.2 25.010
Answer:
The heat of the reaction is -5985 J
Explanation:
The heat absorbed by the water is given by
ΔQ = m·c·ΔT
From which
∑ (ΔT·m)/3 = 278.34 kg·°C
ΔQ = c×∑ (ΔT·m)/3 = 4.184 J/g·°C×278.34 kg·°C = 1164.565 J
ΔQ Calorimter = Specific heat capacity of calorimeter, [tex]c_{calorimeter}[/tex] × ΔT[tex]_{average}[/tex]
Where the [tex]c_{calorimeter}[/tex] = 443 J/°C for example, we have
ΔQ Calorimter = 443×11.133 = 4820.733 J
From which the heat of reaction is then
[tex]\Delta Q_{reaction} = -(\Delta Q_{water} + \Delta Q_{calorimter})[/tex]
[tex]\Delta Q_{reaction} = -5985.298 \, J[/tex]
Using 4 digits, we get
[tex]\Delta Q_{reaction} \approx -5985 \, J[/tex].
which three elements are combined in magnesium carbonaye
Answer:
Magnesium, Carbon and Oxygen.
Explanation:
Answer:Magnesium carbonate is a magnesium salt with formula CMgO3. Its hydrated forms, particularly the di-, tri-, and tetrahydrates occur as minerals. It has a role as an antacid and a fertilizer. It is a magnesium salt, a carbonate salt and a one-carbon compound.
Explanation:
How many electrons are unpaired in the orbitals of nitrogen?
The nitrogen has one unpaired electron in its orbitals.
How many electrons are unpaired in the orbitals of nitrogen?The number of electrons in nitrogen (N) is 7 because its atomic number is 7. To find out how many single electrons there are in the orbitals of nitrogen, we have to write down the way its electrons are arranged.
The electron configuration of nitrogen is: 1s² 2s² 2p³
In the 2p orbital, there are three electrons (2p³). Since each orbital can hold a maximum of two electrons, we know that two electrons will be paired in one of the 2p orbitals, and one electron will be unpaired in another 2p orbital.
Therefore, nitrogen has one unpaired electron in its orbitals.
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Describe the process of energy transformation starting from reduced carbohydrates, through the metabolic cofactors (electron recipients) used in oxidative metabolism, ending with the eventual generation of ATP by ATP synthase. Be sure to specify the type of energy conserved at each step of the transformation.
Answer:
Carbohydrates are metabolized by three pathways which are glycolytic pathway, oxidation of fatty acids, and the citric acid cycle. The NADH and FADH2 formed in these pathways are energy rich molecules because each contains a pair of electrons having a high transfer potential. When these electrons are used to reduced molecular oxygen to water, a large amount of free energy is liberated which is used to generate ATP. This process is known as oxidative phosphorylation.
Explanation:
There are two type of reaction that takes place in oxidative phosphorylation which are oxidation and reduction.
First, carbon fuels are oxidized in the citric acid to yield electrons with high transfer potential. Then, this electron motives force is converted into a proton motive force and this proton motive force is finally converted into phoshoryl transfer potential. The final phase of oxidative phosphorylation is carried out by ATP synthase, an ATP synthesizing assembly that is driven by the flow of protons back into the mitochondrial matrix.
Answer:
Carbohydrates is a macromolecules which is broken down into simpler substances like glucose which is used in the generation of energy in the process of cellular respiration.
Explanation:
Glycolysis is the first phase of respiration in which glucose molecule is broken down forming two molecules of pyruvate, two molecules of ATP, two molecules of NADH and two molecules of water. The second phase is Krebs cycle in which oxidation of acetyl-CoA occurs and energy is released in the form 2 ATP and carbondioxide. Electron transport chain is a third phase in which NADH, FADH and oxygen are the reactants producing 34 ATP and water. 34 ATP includes ATP of glycolysis and Krebs cycle.
All of the following will normally be found in the filtrate except
Answer:
Erythrocytes
Explanation:
Water passes through the Bowman's capsule into the glomerular filtrate and so do salts, glucose, urea, amino acids, and a majority of smaller proteins (molecular weight < 68,000). Erythrocytes or other blood cells do not enter the glomerular filtrate.
Hydrothermal vents, submarine hot springs, and methane cold seeps release heat and chemicals deep below the surface of the ocean. Surprisingly, the areas around these sites are able to support ecosystems. Based on this information, such ocean ecosystems most likely contain A. primary consumers that obtain energy from photosynthetic plants. B. primary producers that create energy from oxidizing chemicals. C. primary producers that obtain energy from photosynthetic plants. D. primary consumers that create energy from oxidizing chemicals.
Answer:
Primary producers that create energy from oxidizing chemicals. (Ans. B).
Explanation:
Hydrothermal vents, submarine hot springs form as a result of volcanic activity on the ocean floor. Cracks occur in the Earth's crust, water seeps dissolving minerals and evolves superheated from.
Through the process of chemosynthesis, some specialized species such as crabs, shrimp, slugs, etc generate energy from the H2S (hydrogen sulfide) which is present in the mineral abundant water splashing out of the vents. These bacteria are able to support ecosystems as a primary producer form the bottom level of the food chain in which all other animals are dependent.
Final answer:
Ocean ecosystems around hydrothermal vents support thriving communities of living things, including primary consumers that create energy from oxidizing chemicals.
Explanation:
The ocean ecosystems around hydrothermal vents, submarine hot springs, and methane cold seeps are able to support thriving communities of living things. These ecosystems contain chemoautotrophic bacteria that synthesize complex organic molecules, such as glucose, using energy from inorganic compounds like hydrogen sulfide (H₂S) released from the vents. The rest of the ecosystem, including primary consumers like swimming shrimp, squat lobsters, and vent mussels, obtain energy from these bacteria, making option D. primary consumers that create energy from oxidizing chemicals the correct answer.
When discussing the Arrhenius equation and chemical / enzyme kinetics, which of the following statements is incorrect ? A. A catalyst lowers the activation energy of a reaction B. A high activation energy signifies that the rate constant depends strongly on temperature C. A negative activation energy indicates that the rate increases as the temperature is raised D. The activation energy, the parameter Ea in the Arrhenius equation, is the minimum energy that a molecular encounter needs in order to result in a reaction E. If a reaction has zero activation energy, its rate is independent of temperature
Answer:
Explanation:
It is letter d
select the correct formula for each compound for each compound
boron tribromide
Answer:
BBr3
Explanation:
Attached image.
Boron tribromide:
BBr3
phosphorus trihydride:
PH3
The latent heat of fusion of ice is 3.4 X 105 J/Kg. What do you mean by this statement? Explain.
Answer:
This is the amount of heat required to change solid ice into liquid water.
Explanation:
-Latent heat of fusion or enthalpy of fusion is defined as the amount of heat required by a substance to change its status from solid to liquid
-Hence, 3.4 X 105 J/Kg is the amount of heat required to change solid ice into liquid water.
An unfortunate squirrel is hit by a car. A small bit of gas originally 0.005 L in volume is trapped in the squirrel's body at a temperature of 308 K. During the day, the Sun heats the squirrel to a temperature of 328 K. What is the volume of the gas in the squirrel now (keep 4 decimals in your answer)?
Answer: The volume of the gas in the squirrel now is 0.00532 L
Explanation:
To calculate the final volume of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.
Mathematically,
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
where,
[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.
[tex]V_2\text{ and }T_2[/tex] are the final volume and temperature of the gas.
We are given:
[tex]V_1=0.005L\\T_1=308K\\V_2=?\\T_2=328K[/tex]
Putting values in above equation, we get:
[tex]\frac{0.005}{308}=\frac{V_2}{328}\\\\V_2=0.0053L[/tex]
Thus the volume of the gas in the squirrel now is 0.00532 L
The human resources manager at a company records the length, in hours, of one shift at work, X. He creates the probability distribution below. What is the probability that a worker chosen at random works at least 8 hours?
0.62
0.78
0.84
0.96
Answer is 0.62
Explanation: Since the worker works at least 8 hours minimum, therefore total maximum length of time is 16 hours.Thus, the probability of at least 8 hours is. 16/24=2/3=0.62
Answer:
Answer is 0.62
Explanation:
i
What is the limiting reactant when 3 grams of propane is mixed with 10 grams of Oxygen?
C3H8 + O2 —> H2O + CO2
Answer:
The answer to your question is Propane
Explanation:
Data
mass of Propane = 3 g
mass of Oxygen = 10 g
limiting reactant = ?
Balanced chemical reaction
C₃H₈ + O₂ ⇒ H₂O + CO₂
Process
1.- Calculate the molar mass of the reactants
C₃H₈ = (12 x 3) + (8 x 1) = 36 + 8 = 44 g
O₂ = 16 x 2 = 32 g
2.- Calculate the theoretical yield C₃H₈ / O₂ = 44/32 = 1.375
3.- Calculate the experimental yield C₃H₈/O₂ = 3/10 = 0.3
4.- Conclusion
The limiting reactant is Propane because the experimental yield was lower than the theoretical yield.
What substance does a tree use for food?
a. photosynthesis b. chlorophyll
c. glucose
d. leaves
Answer:
B
Explanation:
The leaves contain a pigment called chlorophyll, which colors the leaves green.
Answer: B
Explanation:
Chlorophyll can make food the plant can use from carbon dioxide, water, nutrients, and energy from sunlight.
A balloon is inflated to a volume of 5.0 liters at 0.98atm and 25c and taken on world adventures: in an aireplane cabin, the pressure drops 585 torr while the temperature remains constants at 25c. What is the volume of the ballon in the airplane cabin
Answer:
6.37 L
Explanation:
- Used combined gas law. Get rid of temperature since it is constant. (You could also keep it and get the same answer, but it is another step)
- Change C to K
- Change torr to atm
- Hope this helps! I would be glad to give you a step by step explanation. Please let me know if you want help on how to do these types of problems.