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2024 ESL Factors Affecting Reaction Rates

Total questions: 55

Worksheet time: 1hrs 5mins

Name
Class
Date
1.
Grinding a seltzer tablet into powder increases the rate of reaction due to increased
a)
concentration
b)
surface area
c)
temperature
d)
reactants
2.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
all of these
3.
Smaller particle size allows for a _________ surface area to be exposed for the reaction.
a)
larger
b)
smaller
4.
Increasing the concentration of the reactants will slow down the reaction.
a)
false 
b)
true
5.
Why does a higher temperature increase the rate of a reaction?
a)
it increases both the frequency and energy of particle collisions
b)
it only increases the frequency of particle collisions
c)
it only increases the energy of particle collisions
d)
it reduces the activation energy of the reaction
6.
Why does a higher concentration increase the rate of reaction?
a)
it increases the amount of reactants
b)
it lowers the activation energy
c)
it increases the energy of particle collisions
d)
it increases the frequency of particle collisions because there are more collision sites
7.
Which of these will NOT speed up the rate of reaction between a strip of magnesium and hydrochloric acid?
a)
tightly coil up the strip of magnesium
b)
cut up the strip of magnesium
c)
increase the concentration of the hydrocholoric acid
d)
increase the temperature of the hydrocholoric acid
8.
Products will form faster if____________
a)
the particle size of the reactants are larger.
b)
temperature is decreased.
c)
concentration of the reactants are increased.
d)
the reaction is not stirred.
9.
Explosions can happen when there is a large amount of powdered substance because of a large
a)
temperature
b)
surface area
c)
concentration
d)
pressure
10.

Why does a higher concentration increase the rate of reaction?

a)

it increases the amount of reactants

b)

it lowers the activation energy

c)

it increases the energy of particle collisions

d)

it increases the frequency of particle collisions

11.

Increasing the temperature gives particles more __________.

a)

Time

b)

Energy

c)

Space

d)

Frequency

12.

Activation energy is minimum amount of energy needed for the reactions to begin.

Adding a catalyst ___________ the activation energy.

a)

Raises

b)

Lowers

c)

Doesn't affect

d)

Inreases

13.

Powdered sugar has a greater ______ _____ than a solid cube of

sugar.

a)

Surface Area

b)

Catalyst

c)

Temperature

14.

Which group of particles shows that increasing surface area increases collisions among particles?

a)

Left side

b)

Right side

c)

Cannot be determined by either picture

15.

How does increasing pressure affect the rate of reaction in gases?

a)

It changes the state of the reactants

b)

It increases the rate of reaction by increasing collision frequency

c)

It has no effect on the rate of reaction

d)

It decreases the rate of reaction

16.

Which of the following will decrease the rate of a chemical reaction?

a)

Adding a catalyst

b)

Increasing the surface area of reactants

c)

Increasing the concentration of reactants

d)

Decreasing the temperature

17.

Select FOUR factors that affect the rate of reaction:

a)

temperature

b)

concentration

c)

surface area

d)

volume

e)

catalyst

18.

Select ALL factors that increase the rate of a reaction?

a)

increasing temperature

b)

increasing concentration

c)

increasing surface area

d)

increasing particle size

e)

adding a catalyst

19.

As the frequency of ______________ increases, the rate of reaction increases.

a)

Time

b)

Reactions

c)

Collisions

d)

Reactants

20.
Two clear and colorless solutions are combined within a test tube. The resulting solution is purple. Do you assume a chemical reaction took place?
a)
Yes
b)
No
21.

Which of the following will slow down a chemical reaction?

a)

Lower concentration

b)

Increase temperature

c)

Increase particle size

d)

Add a catalyst

22.

First lets review!!

What are some signes that a chemical reaction has taken place?

a)

change in shape

b)

bubbles of gas appear

c)

melting

d)

dissolving

23.

In an endothermic reaction, energy is

a)

absorbed

b)

released

24.

If a chemical reaction is ENDOTHERMIC, the temperature would...

a)

stay the same

b)

increase

c)

decrease

25.

In an exothermic reaction, energy is

a)

absorbed

b)

released

26.

If a chemical reaction is EXOTHERMIC, the temperature would...

a)

stay the same

b)

increase

c)

decrease

27.

_____ reactions usually feel cool

a)

endothermic reaction

b)

exothermic reaction

28.

Rocket launch

a)

endothermic

b)

exothermic

29.

Which of the following is an example of an exothermic reaction?

a)

A) Photosynthesis

b)

B) Melting ice

c)

C) Burning wood

d)

D) Dissolving salt in water

30.

How many Hydrogens are in 2H2O?

a)

2

b)

4

c)

6

d)

1

31.

How many Oxygens are in 6H2O?

a)

2

b)

12

c)

6

32.

How many Carbons are in 3CO2?

a)

3

b)

6

c)

2

33.

Balanced or Not?


H2 + Cl2 ---> 2HCl

a)

Balanced

b)

Unbalanced

34.

What does the following represent?

a)

coefficient

b)

subscript

c)

elements

35.

What is the part of the chemical equation in green called?

Fe + S --> FeS

a)

products

b)

reactants

c)

yield

d)

chemical formula

36.

How many total atoms are in H2SO4?

a)

3

b)

5

c)

6

d)

7

37.

Coefficients in chemical formulas...

a)

Multiply just the first atom

b)

Add to the subscripts at the end of the molecule

c)

Multiply elements without subscripts

d)

Multiply EVERYTHING!

38.

How can chemical reactions occur?

a)

Only quickly

b)

Only slowly

c)

Quickly or slowly

d)

Neither quickly nor slowly

39.

Law of conservation of mass states the amounts of atoms in the reactants and the products...

a)

Increase

b)

Decrease

c)

Stay the same

d)

No correct answer

40.

If a reaction starts with a total 75 g of reactants it should produce

a)

a total of 40 g of products

b)

a total of 75 g of products

c)

a total of 180 g of products

d)

No correct answer

41.

Which shows the law of conservation of mass?

a)

a

b)

b

c)

c

d)

d

42.
a)

a

b)

b

c)

c

43.
a)

a

b)

b

c)

c

d)

d

44.

Which is balanced and shows the law of conservation of mass?

a)

top

b)

bottom

45.

choose 2 answers

a)

The left equation is endothermic

b)

The right equation is endothermic

c)

The left equation is exothermic

d)

The right equation is exothermic

46.
a)

endothermic examples

b)

exothermic examples

47.
a)

4 oxygen atoms

1 carbon atom

b)

1 oxygen atom

4 hydrogen atoms

c)

1 hydrogen atom

4 oxygen atoms

d)

1 carbon atom

4 hydrogen atoms

48.

Which substance underwent a chemical reaction?

a)

w

b)

x

c)

y

d)

z

49.
a)

add 1 more carbon dioxide compound

b)

add 2 more water molecules

c)

add 2 more carbon dioxide compounds

d)

add 1 more water molecule

50.
a)

a

b)

b

c)

c

d)

d

51.
Balance:
Fe + H2O →  Fe3O4 + H2
a)
3,4,1,1
b)
3,1,1,1
c)
3,4,1,4
52.
Balance:
Zn + HCl → ZnCl2 + H2
a)
1,2,1,1
b)
2,2,2,1
c)
2,2,2,2
53.

O2(g) + 2 H2 (g) → 2 H2O (g) + EnergyO_2\left(g\right)\ +\ 2\ H_2\ \left(g\right)\ \rightarrow\ 2\ H_2O\ \left(g\right)\ +\ Energy  

a)

endothermic

b)

exothermic

54.

6 CO2+ 6 H2O + Energy → C6H12O6 + 6 O26\ CO_2+\ 6\ H_2O\ +\ Energy\ \rightarrow\ C_6H_{12}O_6\ +\ 6\ O_2

a)

endothermic reaction

b)

exothermic reaction

55.

The Y-axis shows reaction rates. Which graph has a higher rxn rate?

a)

blue line

b)

red line

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