Free Printable Reactions 2

1.

the smallest particle of an element that can exist

a)

atom

b)

chemical

c)

matter

d)

bond

2.

in chemistry, the force that holds the atoms in a molecule together

a)

product

b)

compound

c)

property

d)

bond

3.

composed of more than one element, ingredient or part

a)

atom

b)

matter

c)

compound

d)

conserve

4.

to protect from loss; to use carefully

a)

chemical

b)

reaction

c)

property

d)

conserve

5.

a substance formed in a chemical reaction

a)

reactant

b)

reaction

c)

product

d)

bond

6.

in chemistry, the change that happens when two or more substance act on each other to form a different substance

a)

matter

b)

conserve

c)

chemical

d)

reaction

7.

What reaction type is characterized by the reactant breaking down as the reaction progresses?

a)

Synthesis

b)

Decomposition

c)

Combustion

d)

Double Replacement

8.

What is the term for the → sign in a reaction?

a)

makes

b)

produces

c)

yields

d)

all are correct

9.

What two molecules are produced in a combustion reaction?

a)

CO₂+ NH₄

b)

SiO₂ + H₂O

c)

H₂O + CO₂

d)

CO₂+ H₂O₂

10.

Is the reaction below exothermic or endothermic?
CH₄ + 2O₂ → CO₂ + H₂O + heat

a)

exothermic

b)

endothermic

11.

___________________ are the elements/compounds formed in a chemical reaction (on the right)

a)

Polymers

b)

Bonds

c)

Reactants

d)

Products

12.

On the left side of the reaction. These are the chemicals that you start with.

a)

Product

b)

Reactant

c)

Coefficient

d)

Subscript

e)

Law of Conservation of Mass

13.

States that mass cannot be created or destroyed in a chemical reaction.

a)

Product

b)

Reactant

c)

Coefficient

d)

Subscript

e)

Law of Conservation of Mass

14.

On the right side of the reaction. These are the chemical that are made.

a)

Product

b)

Reactant

c)

Coefficient

d)

Subscript

e)

Law of Conservation of Mass

15.

What is the type of reaction? Fe₂O₃--> Fe + O₂

a)

Decomposition

b)

Synthesis

c)

Single Replacement

d)

Double Replacement

e)

Combustion

16.

What type of reaction is CH₄ + O_{2 -->}CO₂ + H₂O

a)

Decomposition

b)

Synthesis

c)

Single Replacement

d)

Double Replacement

e)

Combustion

17.

Which of the following equations is NOT balanced?

a)

$Fe\ \ +\ \ S\ \ \rightarrow\ \ FeS$

b)

$KOH\ +\ HCl\ \rightarrow\ KCl\ +\ H_2O$

c)

$2Mg\ +\ O_2\ \rightarrow\ 2MgO$

d)

$NaCl\ +\ H_2SO_4\ \rightarrow\ Na_2SO_4\ +\ HCl$

18.

A synthesis reaction between magnesium (Mg) and oxygen (O2) might produce

a)

$Mg_2$

b)

$O_4$

c)

$MgO$

d)

$MgCO_2$

19.

In an exothermic reaction, energy is transferred from

a)

the reactants to the surroundings

b)

one reactant to another

c)

the surroundings to the reactants

d)

the container to the chemicals

20.

The product of the synthesis reaction between sodium and chlorine gas is

a)

polyethylene

b)

carbon dioxide

c)

sodium chloride

d)

copper (II) chloride

21.

What happens in a chemical reaction?

a)

atoms are destroyed

b)

atoms are created

c)

atoms are heated and cooled

d)

atoms are rearranged

22.

What is the chemical symbol for the element hydrogen

a)

H

b)

He

c)

h

d)

he

23.

What is the chemical symbol for the element Silicon

a)

S

b)

Si

c)

si

d)

Sl

24.

What is the chemical symbol for the element Carbon

a)

ca

b)

co2

c)

C

d)

Cd

25.

What is the chemical symbol for the element copper?

a)

co

b)

c

c)

Cu

d)

cu

26.

What is the chemical symbol for the element Aluminum

a)

A

b)

AL

c)

Al

d)

al

27.

What is the chemical symbol for the element Nitrogen

a)

Ni

b)

N

c)

No

d)

Nb

28.

What is the chemical symbol for the element oxygen

a)

O

b)

Oxy

c)

ox

d)

Oy

29.

What is the chemical symbol for the element Silver

a)

S

b)

Si

c)

Au

d)

Ag

30.

What is the chemical symbol for the element Chlorine

a)

C

b)

Cl

c)

cl

d)

Ch

31.

What is the chemical symbol for the element Gold

a)

G

b)

go

c)

AU

d)

Au

32.

What element is represented by the Chemical symbol Mg

a)

Manganese

b)

Magnesium

c)

Molybdenum

d)

Mitrium

33.

What is the chemical symbol for the element Iron

a)

I

b)

Ir

c)

Fe

d)

fe

34.

What is the chemical symbol for the element Zinc

a)

Z

b)

Zn

c)

Zr

d)

zn

35.

What is the chemical symbol for the element Helium

a)

He

b)

he

c)

H

d)

h

36.

What is the chemical symbol for the element Calcium

a)

C

b)

Ca

c)

Cl

d)

CL

37.

What is the chemical symbol for the element Potassium

a)

K

b)

P

c)

Po

d)

Pt

38.

What is the chemical symbol for the element Phosphorus

a)

p

b)

P

c)

Ph

d)

Ps

39.

What is the chemical symbol for the element Sodium

a)

Na

b)

So

c)

S

d)

Sd

40.

What is the chemical symbol for the element Iodine

a)

I

b)

Io

c)

Id

d)

In

41.

What is the chemical symbol for the element Fluorine

a)

F

b)

Fl

c)

Flu

d)

f

42.

Which is the correct formula for:
one carbon (C)
two oxygen (O)

a)

CO₂

b)

CO

c)

C₂O

d)

2CO

43.

How many elements are in H₂O?

a)

1

b)

2

c)

3

d)

4

44.

What is Fe₂O₃
(rust) made up of?

a)

1 flourine, 2 einsteinium,
3 oxygen

b)

2 fluorine, 3 oxygen

c)

2 iron, 3 oxygen

d)

2 iron, 3 osmium

45.

What reaction type is characterized by the reactant breaking down as the reaction progresses?

a)

Synthesis

b)

Decomposition

c)

Combustion

d)

Double Replacement

46.

What two molecules are produced in a combustion reaction?

a)

CO₂+ NH₄

b)

SiO₂ + H₂O

c)

H₂O + CO₂

d)

CO₂+ H₂O₂

47.

Is the reaction below exothermic or endothermic?
CH₄ + 2O₂ → CO₂ + H₂O + heat

a)

exothermic

b)

endothermic

48.

The Law of Conservation of Mass states

a)

that matter exists in all states and reacts the same

b)

that matter can only be changed into new substances by introducing a catalyst

c)

that matter exists in the same state throughout any chemical change

d)

that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

49.

___________________ are the elements/compounds formed in a chemical reaction (on the right)

a)

Polymers

b)

Bonds

c)

Reactants

d)

Products

50.

What are the reactants in the chemical equation pictured?

a)

CH₄ and CO₂

b)

CH₄ and O₂

c)

CO₂ and H₂O

d)

O₂ and H₂O

51.

Is this balanced?...
Al + O₂ --> 2Al₂O₃

a)

Yes!

b)

NO!

52.

Is this balanced?...
Fe + S --> FeS

a)

YES!

b)

NO!

53.

A chemical change is different than a physical change because in a chemical change

a)

chemicals are used

b)

molecules do not physically touch

c)

a new substance is formed and in a physical no new substance is formed

d)

the change can be seen but in a physical change it cannot

54.

Which of the following 2 are chemical reactions?

a)

sugar dissolving in water

b)

water turning into steam

c)

burning wood

d)

mixing baking soda and vinegar

e)

tearing paper

55.

How many Carbons are present on the reactant side?

a)

1

b)

2

c)

3

d)

4

56.

How many Hydrogens are on the product side of this chemical equation?

a)

1

b)

2

c)

3

d)

4

57.

How many Oxygens are on the product side of this chemical equation?

a)

1

b)

2

c)

3

d)

4

58.

Why are chemical equations always balanced? Select ALL that apply.

a)

Matter cannot be created.

b)

Matter cannot be destroyed.

c)

Matter can only be rearranged/conserved.

d)

Matter doesn't matter.

59.

In a chemical reaction, if the reactants are heated, the reaction usually happens

a)

slower

b)

faster

c)

at the same rate

d)

in a smaller volume

60.

What does it mean for a reaction to be endothermic? Choose 2 of the following.

a)

When two substances react, the temperature of the mixture decreases.

b)

When two substances react, the temperature of the mixture increases.

c)

There is less energy going into the reactant to break the bond than there is energy leaving the product.

d)

There is more energy going into the reactant to break the bond than there is energy leaving the product.

e)

The amount of energy entering and leaving is the same.

61.

What does it mean for a reaction to be exothermic? Choose 2 of the following.

a)

When two substances react, the temperature of the mixture decreases.

b)

When two substances react, the temperature of the mixture increases.

c)

There is less energy going into the reactant to break the bond than there is energy leaving the product.

d)

There is more energy going into the reactant to break the bond than there is energy leaving the product.

e)

The amount of energy entering and leaving is the same.

62.

Exothermic reactions...

a)

Absorb energy

b)

Release energy

c)

Release Color

d)

Absorb Color

63.

What type of reaction occurs in a hand warmer

a)

exothermic

b)

endothermic

64.

In an endothermic reaction, heat is ...

a)

taken in or absorbed

b)

given out or released

65.

Have you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?

a)

It is an exothermic reaction

b)

It is an endothermic reaction

c)

It is made of ice

d)

It is dissolving your mouth

66.

If they energy required to break the bonds is greater than the energy given out by making new bonds the reaction is

a)

Exothermic

b)

Endothermic

c)

Neutralisation

67.

$O_2\left(g\right)\ +\ 2\ H_2\ \left(g\right)\ \rightarrow\ 2\ H_2O\ \left(g\right)\ +\ Energy$

a)

endothermic

b)

exothermic

68.

$6\ CO_2+\ 6\ H_2O\ +\ Energy\ \rightarrow\ C_6H_{12}O_6\ +\ 6\ O_2$

a)

endothermic reaction

b)

exothermic reaction

69.

_____ reactions usually feel hot!

a)

endothermic

b)

exothermic

70.

____ reactions usually feel cold.

a)

endothermic

b)

exothermic

Reactions 2

Total questions: 70

Worksheet time: 1hrs 17mins

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