Kinetics and Stoichiometry

The study of reaction speeds is called
Kinetics
A catalyst speeds up a chemical reaction by
lowering the activation energy of the reaction.
If product molecules have a lower energy than reactant molecules, the reaction is (exothermic / endothermic)
exothermic
The energy of a molecule is stored in its
bonds
Powdered magnesium will react faster than a strip of magnesium ribbon because
The powdered magnesium exposes more surface area during the reaction.
A chemical reaction can be slowed down by (increasing / decreasing) temperature.
decreasing
A chemical that speeds up a chemical reaction is called a
catalyst
A biological catalyst is called a(n)
enzyme

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The activation energy of the catalyzed reaction is

10 kJ
True / False:  By speeding up a chemical reaction, you increase the amount of product produced. 
False.  You don’t make any more product; you just create the same amount of product faster.
Increasing the concentration of a reactant speeds up a chemical reaction because
there will be more frequent collisions between the reactants
A slow-release medicine capsule controls its reaction speed by controlling (temperature/surface area/catalyst).
surface area.; By dissolving slowly over time, the capsule exposes a small amount of medicine for reaction each hour.
By using a catalyst, you (increase/decrease/do not change) the enthalpy of reaction (;H).

do not change.; See the diagram below, comparing a catalyzed to a noncatalyzed reaction.

;

;

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The enthalpy of reaction (;H);in the chemical reaction below is

;

;

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negative 15 kJ
When performing stoichiometry calculations, the coefficients of a balanced equation are interpreted as (gram/mole) ratios.
mole ratios

If 3 moles of HCl are consumed in the reaction below, how many moles of FeCl3 are produced?

;

___ HCl + ___ Fe2O3 ; ___ FeCl3 + ___ H2O

;

1 mole FeCl3 will be produced

Given the equation ___ H2O ; ___ H2 + ___ O2,

how many moles of H2O would be required to produce 2.5 moles of O2?

5 moles H2O

Consider the equation __ CaCO3 ; __ CaO + __ CO2.

If 3 moles of calcium carbonate decomposes according to the reaction above, how many grams of CO2 are produced?

132 grams

If;146 grams of HCl are are used in the reaction

___ HCl + ___ Fe2O3 ; ___ FeCl3 + ___ H2O,

how many moles of FeCl3 are produced?

1.3;moles FeCl3

In the reaction ___ Zn + ___ H2SO4 ; ___ ZnSO4 + H2,

how many grams of H2SO4 are required to produce 1.0 gram of H2?

49 grams H2SO4

Methane undergoes a combustion reaction to produce carbon dioxide and water vapor:

;

___ CH4 + ___ O2 ; ___ CO2 + ___ H2O

;

If 6600 grams of CO2 are produced, what mass of oxygen gas was required?

9600 grams of O2 was required

Given the reaction __ Zn + __ HCl ; __ ZnCl2 + __ H2 ,

if 2 mol Zn and 5 mol HCl are allowed to react, what is the correct amount of ZnCl2 produced?

This is a limiting reactant problem, since amounts of both reactants are given to you.

;

By completing the stoichiometry, 2 mol Zn will produce 2 mol ZnCl2 and 5 mol HCl will produce 2.5 mol ZnCl2.; So the correct amount is the lower amount, 2 mol ZnCl2

If amounts of both reactants are given to you in a stoichiometry problem, one of the reactants will be used up first, and we call that reactant the (excess/limiting) reactant.
limiting
The starting amount of the (excess/limiting) reactant produces the correct amount of product in a chemical reaction.
limiting
Can you draw out the stoichiometry roadmap?
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x

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