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PHYSCI - Chemical Reaction Quiz

Total questions: 65

Worksheet time: 52mins

Name
Class
Date
1.

How can a chemical equation be balanced?

a)

changing subscripts

b)

erasing elements as necessary

c)

adding coefficients

d)

adding elements as necessary

2.

What are the products in this equation?

a)

Zn and CuSO4

b)

Zn and Cu

c)

ZnSO4 and Cu

d)

Zn only

3.

The following are the evidences that chemical reaction took place, EXCEPT:

a)

evolution of gas

b)

formation of precipitate

c)

formation of new element

d)

change in the intrinsic properties

4.

Lily is conducting an experiment in her chemistry class. She learns that chemical equations are balanced by placing the appropriate ___________ before the symbols or formulas of reactants and products.

a)

subscript

b)

exponent

c)

letter

d)

coefficient

5.

Which of the following is the balanced equation for Zn + HCl --> ZnCl2 + H2?

a)

Zn + HCl --> 2ZnCl2 + H2

b)

Zn + 2HCl --> ZnCl2 + H2

c)

2Zn + HCl --> 2ZnCl2 + H2

d)

Zn + 2HCl --> 2ZnCl2 + H2

6.

Which of the following sets of coefficients can be used to balance the equation, CH4 + O2 --> CO2 + H2O?

a)

1,1,2,1,

b)

1,2,1,2

c)

2,1,2,1

d)

2,2,1,1

7.

Which of the following is a balanced chemical reaction?

a)

2C3H8 + 10 O2 → 6CO2 + 8H2O

b)

C3H8 + O2 → CO2 + H2O

c)

C3H8 + O2 → 3CO2 + 2H2O

d)

C3H8 + 5O2 → 3CO2 + 4H2O

8.

Which of the following chemical reaction shows the production of water from hydrogen gas and oxygen gas?

a)

2 H2O → 2 H2 + O2

b)

2 H2 + O2 → 2 H2O

c)

3 H2 + O2 → 3 H2O

d)

3 H2O → H2 + 3 O2

9.

Which of the following sets of coefficients can be used to balance the equation, Al + O2 --> Al2O3

a)

2,3,2

b)

2,3,4

c)

4,3,2

d)

2,1,4

10.

The Law of Conservation of Mass states that in a chemical reaction,

a)

mass of the reactants and mass of the products are equal

b)

new elements are formed

c)

new atoms are created

d)

atoms are destroyed

11.

Identify the indicator of chemical reaction.

a)

Change in temperature

b)

Production of gas

c)

Change in color

d)

Formation of precipitate

12.

Identify the indicator of chemical reaction.

a)

Change in temperature

b)

Production of gas

c)

Change in color

d)

Formation of precipitate

13.

Name the following ionic compound: BeCl2

a)

beryllium chlorine

b)

beryllium II chloride

c)

beryllium chloride

d)

beryllium dichloride

14.
The covalent compound N2O5 would be named
a)
nitrogen oxide.
b)
dinitrogen oxide.
c)
nitrogen pentoxide.
d)
dinitrogen pentoxide.
15.
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.
16.
A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 
a)
catalyst
b)
product
c)
reactant
d)
solute
17.

It refers to the substance(s) that are considered to be "ingredients" of a chemical reaction.

a)

reactants

b)

products

c)

catalysts

d)

enhancers

18.

In an endothermic reaction, energy is _________.

a)

absorbed

b)

released

19.

_____ reactions usually feel hot!

a)

endothermic

b)

exothermic

20.

Your family uses candles to see when the electricity goes out.

a)

exothermic

b)

endothermic

21.

A sunflower makes food during photosynthesis.

a)

exothermic

b)

endothermic

22.

You freeze juice to make ice pops.

a)

exothermic

b)

endothermic

23.

A substance that is formed as the result of a chemical reaction is a __________________

a)

Product

b)

Reactant

c)

Starters

d)

Enders

24.

A change in the shape of an object is an example of _________________.

a)

a chemical change

b)

energy

c)

an endothermic change

d)

a physical change

25.

In the equation 2Mg+O2 → 2MgO2Mg+O_2\ \rightarrow\ 2MgO   which are the reactants?

a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
26.

It is a process where a particular substance or substances change into one or more new substances.

a)

a. Chemical Reaction

b)

b. Chemical Change

c)

c. Physical Change

d)

d. Chemical Equation

27.

This theory states that the rate of reaction is directly proportional to the number of collisions of molecules per second.

a)

a. Bigbang theory

b)

b. Bigbang theory

c)

c. Collision theory

d)

d. Atom theory

28.

It is the minimum energy needed to initiate a chemical reaction.

a)

Activity Energy

b)

Activation energy

c)

Active energy

d)

Addition Energy

29.

This factor affects the rate of reaction by increasing or decreasing of kinetic energy.

a)

a. Temperature effects

b)

b. Concentration

c)

c. Surface area

d)

d. Effects of catalyst

30.

This factor affects the rate of reaction by increasing or decreasing of reactant particles.

a)

a. Temperature effects

b)

b. Concentration

c)

b. Surface area

d)

d. Effects of catalyst

31.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
32.

Explain how an increase in temperature affects the rate of a chemical reaction.

a)

An increase in temperature only affects the color of a chemical reaction.

b)

An increase in temperature has no effect on the rate of a chemical reaction.

c)

An increase in temperature generally increases the rate of a chemical reaction.

d)

An increase in temperature generally decreases the rate of a chemical reaction.

33.

How does the concentration of reactants impact the rate of a chemical reaction?

a)

Higher concentration of reactants generally leads to a faster reaction rate.

b)

The impact of concentration of reactants on the rate of a chemical reaction depends on the type of reactants.

c)

Concentration of reactants has no impact on the rate of a chemical reaction.

d)

Lower concentration of reactants generally leads to a faster reaction rate.

34.

Give an example of a chemical reaction where temperature plays a crucial role in controlling the rate.

a)

The reaction between baking soda and vinegar

b)

The reaction between sodium and chlorine to form salt

c)

The reaction between hydrogen and oxygen to form water

d)

The reaction between iron and oxygen to form rust

35.

Discuss the role of surface area in increasing the rate of a chemical reaction in everyday life.

a)

Surface area only affects physical changes, not chemical reactions

b)

Surface area increases the contact between reactant particles, leading to more collisions and a higher reaction rate.

c)

Surface area has no impact on the rate of a chemical reaction

d)

Increasing surface area decreases the rate of a chemical reaction

36.

If the concentration of a reactant is increased, the reaction rate will ___________.

a)

increase

b)

decrease

c)

stay the same

37.
The ___________ the surface area of the reactants, the faster the reaction rate.
a)
larger 
b)
smaller
38.

Decreasing the concentration of the reactants increases the collision frequency between reacting particles.

a)

TRUE

b)

FALSE

39.

Increasing the concentration of a substance increases the kinetic energy of the particles that make up the substance

a)

TRUE

b)

FALSE

40.

Increasing the surface area of the reactant, increases the rate of the reaction.

a)

TRUE

b)

FALSE

41.

Raising the temperature of the reaction increases the rate of the reaction by increasing the energy of the collisions between reacting particles.

a)

TRUE

b)

FALSE

42.

If the reactant particles collide with less than the activation energy, the particles bounce back, and no reaction will occur

a)

TRUE

b)

FALSE

43.

Which of the following would NOT increase the rate of reaction?

a)

Increasing the temperature

b)

Adding catalyst

c)

Increasing the volume

d)

Increasing the concentrations

44.

Suppose you dissolve Zinc (Zn) in Hydrochloric acid (HCl) and add more acid than usual. Then drop pieces of Zinc. What factor does NOT affect the rate of the reaction?

a)

Surface area of the Zinc

b)

Concentration of the reactant

c)

Temperature of the solution

d)

Amount of Hydrochloric acid

45.

Why does a candle burn more rapidly when placed in an open jar than in air?

        What accounts for this reaction?

a)

Higher Oxygen concentration

b)

Greater surface area of the jar

c)

Increasing the surrounding temperature

d)

Length of the candle

46.
Smaller particle size allows for a _________ surface area to be exposed for the reaction.
a)
larger
b)
smaller
47.

Does the presence of catalyst will change the amount of product?

a)

Yes

b)

No

48.

The glow stick glowed brighter in hot water because

a)

the chemical reaction slowed down in hot water

b)

the chemical reaction speed up in hot water

c)

temperature has no effect on the glow stick chemical reaction

d)

all of the above

49.

Increasing the temperature will increase the kinetic energy of particles, therefore increasing the collisions between particles.

a)

false

b)

true

50.

When a sugar cube is crushed up, the particles get smaller. How has the surface area of the particles changed?

a)

the surface area increases

b)

the surface area decreases

c)

the surface area remains constant

51.

How does increasing the concentration affect a reaction rate?

a)

makes it go faster (increases rate)

b)

makes it go slower (decreases rate)

52.

How does increasing concentration increase the rate of a reaction?

a)

fewer collisions occur among reactants

b)

more kinetic energy is provided to the reactants

c)

more collisions occur among reactants

d)

less kinetic energy is provided to the reactants

53.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.
54.

How many Iron (Fe) atoms are in this chemical formula?

a)
2 iron atoms
b)
6 iron atoms
c)
5 iron atoms
d)
4 iron atoms
55.

Ferrous sulfide is reacted with Oxygen, to form Ferric oxide and Sulfur dioxide. What is the balanced equation?

a)

FeS+3O₂ -> 2FeO+SO₂

b)

4FeS+7O₂ -> 2Fe₂O₃+4SO₂

c)

2FeS+3O₂ -> 2FeO+2SO₂

d)

4FeS+O₂ -> Fe₂O₃+4SO₂

56.

Aluminum is reacted with Sulfuric Acid, to form Aluminum Sulfate and Hydrogen gas. What is the balanced equation?

a)

2Al + 2H2SO4 -> Al2(SO4)2 + 2H2

b)

Al + 3H2SO4 -> Al3(SO4)3 + 3H2

c)

4Al + 6H2SO4 -> 2Al2(SO4)3 + 6H2

d)

2Al + 3H2SO4 -> Al2(SO4)3 + 3H2

57.

Is the following equation balanced?

Al + O2 ---> 2Al2O3

a)

YES

b)

NO

58.

Is the following equation balanced?

2C2H2 + 5O2 ---> 4CO2 + 2H2O

a)

YES

b)

NO

59.

Is the following equation balanced?

4Fe + 3O2 ---> 2Fe2O3

a)

YES

b)

NO

60.

Is the following equation balanced?

NaHCO3 ---> Na2CO3 + H2O + CO2

a)

YES

b)

NO

61.

Is the following reaction balanced?

2CH3OH + 3O2 ---> 2CO2 + 4H2O

a)

YES

b)

NO

62.

Which of the following equations are correctly balanced?

a)

12CO2 + H2O ---> C6H12O6 + O2

b)

CO2 + H2O ---> 3C6H12O6 + O2

c)

CO2 + 9H2O ---> C6H12O6 + O2

d)

6CO2 + 6H2O ---> C6H12O6 + 6O2

63.

Balance this equation:

H2 + Cl2 ---> HCl

a)

It is balanced.

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

d)

H2 + 3Cl2 ---> 6HCl

64.

Balance this equation:

HgO ---> 2Hg + O2

a)

It is balanced.

b)

2HgO ---> 2Hg + O2

c)

2HgO ---> Hg + O2

d)

HgO ---> Hg + 2O2

65.
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
a)
H3PO4
b)
H2SO4
c)
HClO3
d)
H2O

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