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Phy. Sci. Ch. 7

Total questions: 36

Worksheet time: 20mins

Name
Class
Date
1.

In the following equation, what are the reactants?

NaHCO3 + HCl --> NaCl + H2O + CO2

a)

NaHCO3 and HCl

b)

NaHCO3 and NaCl

c)

HCl and NaCl

d)

NaCl, H2O, and CO2

2.

Which of the following is a statement of the law of conservation of mass?

a)

Mass is created but not destroyed.

b)

Mass is destroyed but not created.

c)

Mass is neither created nor destroyed.

d)

Mass is both created and destroyed, depending on the chemical reaction.

3.

The mass of a hydrogen atom is 1.0 amu, and the mass of a carbon atom is 12.0 amu. What is the molar mass of methane, CH4?

a)

13.0 amu

b)

13.0 g

c)

16.0 amu

d)

16.0 g

4.

In what type of reaction does one reactant form two or more products?

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

5.

What particle is transferred from one atom to another in a redox reaction?

a)

electron

b)

neutron

c)

proton

d)

nucleus

6.

Which of the following is a single replacement?

a. KOH + HCl --> KCl + H2O

b. 2Na + 2H2O --> H2 + 2NaOH

c. 2C2H6 + 7O2 --> 4CO2 + 6H2O

d. H2O + CO2 --> H2CO3

a)

a.

b)

b.

c)

c.

d)

d.

7.

How are reactions related to chemical bonds?

a)

Bonds in the reactants are broken, and bonds in the products are formed.

b)

Bonds in the products are broken, and bonds in the reactants are formed.

c)

Bonds in both the reactants and products are broken.

d)

Bonds are formed in both the reactants and the products.

8.
The number in front of a compound or element is a 
a)
Subscript
b)
Coefficient
c)
Superscript
d)
Charge
9.

The Coefficient (3) in the Chemical Formula, 3H2O, tells you how many _____________ there are.

a)

Atoms of Hydrogen

b)

Atoms of Oxygen

c)

Atoms of Water

d)

Molecules of Water

10.
The number to the lower side of an element is a 
a)
Subscript
b)
Superscript
c)
Coefficient
d)
Charge
11.

How many oxygen atoms are in this chemical formula?

a)

6 oxygen atoms

b)

2 oxygen atoms

c)

3 oxygen atoms

d)

4 oxygen atoms

12.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same  number of atoms
c)
Same subscripts
d)
Same coefficients
13.
If a reaction starts with a total 75g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 75g of products
c)
a total of 180 g of products
d)
None of the above
14.
24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride
a)
62 
b)
38
c)
24
d)
14
15.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
16.
Which equation best represents the law of conservation of mass? 
a)
A
b)
B
c)
C
d)
D
17.
Is this balanced?
2HgO → 2Hg + O2
a)
Yes
b)
No
18.

Is this equation balanced or unbalanced?

CH4 + 2O2--> CO2+ 2H2O

a)

balanced

b)

unbalanced

19.
Is this equation balanced or unbalanced? 
H2 + O2 --> H2O
a)
balanced
b)
unbalanced
20.

P4 + 3 O2 ----> 2 P2O3

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

21.

MgCl2 + Li2CO3 ----> MgCO3 + 2 LiCl

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

22.

CaCO3 ----> CaO + CO2

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

23.

Pb + FeSO4 ----> PbSO4 + Fe

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

24.

2 NH3+ 1 H2SO4 ----> 1 (NH4)2SO4

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

25.

Pb(NO3)2 --> PbO + NO2 + O2

a)

Synthesis (combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

26.

What reaction has the following general formula:

A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

27.

What reaction has the following general formula:

A + B --> AB

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

28.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

29.

What reaction has the following general formula:
CxHy + O2 −>CO2 + H2OC_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

30.

What type of reaction is the following:
C11H24+17O2−> 11CO2 + 12H2OC_{11}H_{24}+17O_2->\ 11CO_2\ +\ 12H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

31.

What type of reaction is the following:
3CuS +2Al −> Al2S3+3Cu3CuS\ +2Al\ ->\ Al_2S_3+3Cu

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

32.

What type of reaction is the following:
2NaHCO3−> Na2CO3+CO2+H2O2NaHCO_3->\ Na_2CO_3+CO_2+H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

33.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
34.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
35.

Avogadro’s number is:

a)

6.02 x 1022

b)

6

c)

6.02 x 1023

d)

3.01 x 1023

36.

Which reaction changes a compound into its constituent elements?

a)

decomposition

b)

synthesis

c)

combustion

d)

single replacement

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