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Unit 4.4 Honors Practice (Equations/Reactions)

Total questions: 19

Worksheet time: 18mins

Name
Class
Date
1.
In any chemical reaction, the mass of the products is always:
a)
slightly less than the mass of the reactants
b)
much less than the mass of the reactants
c)
the same as the mass of the reactants
d)
greater than the mass of the reactants
2.

Which of the following elements would require a subscript of 2 when written in a chemical equation (due to being diatomic)?

a)

solid carbon (C)

b)

gaseous neon (Ne)

c)

gaseous chlorine (Cl)

d)

gaseous helium (He)

3.

A precipitate is...

a)

a gas

b)

a liquid

c)

a solid

d)

a solution

4.

To balance a chemical reaction, it may be necessary to adjust the

a)

coefficients

b)

exponents

c)

subscripts

d)

formulas of the products

5.

How many oxygen atoms are shown here (taking into account the coefficient)?

a)

4

b)

3

c)

12

d)

1

6.

This equation is an example of which general type of reaction?  Mg(s)+2HCl(aq)  H2(g)+MgCl2(aq)Mg_{(s)}+2HCl_{(aq)}\ →\ H_{2(g)}+MgCl_{2(aq)}  

a)

synthesis

b)

decomposition

c)

single-displacement 

d)

double-displacement

7.

What are always the product(s) of the complete combustion of a hydrocarbon (like CH4)

a)

O2

b)

Acids and Bases

c)

H2O and CO2

d)

H2 and C

8.

What type of reaction is shown in the image?

a)

synthesis

b)

decomposition

c)

combustion

d)

single-displacement

9.
2 NH3+ 1 H2SO4 ----> 1 (NH4)2SO4
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
10.
Na3PO4 + 3 KOH ----> 3 NaOH + K3PO4
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
11.
2 AgNO3 + Cu ----> Cu(NO3)2 + 2 Ag
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
12.

Predict the correct formulas of the products for this reaction: NaI + Cl2 --> ____ + ____

a)

ICl2 + Na

b)

NaCl + I2

c)

NaCl2 + I

d)

NaCl + I

13.

Predict the correct formulas of the products to this reaction: CaCl2 + Na3PO4 → ____ + _____

a)

CaPO4 + NaCl2

b)

Ca3(PO4)2 + NaCl

c)

Na2Ca + Cl3(PO4)

d)

Ca2(PO4)3 + NaCl2

14.

Is this reaction balanced? If not, select the choice that best explains why it is not balanced.

Mg(NO3)2 + 2Na --> 2NaNO3 + Mg

a)

No because Mg is not balanced

b)

No because N is not balanced

c)

No because Na is not balanced

d)

No because O is not balanced

e)

yes

15.

Which coefficient must go in the missing spot to balance the chemical equation?


___Cu + O2 --> 2Cu2O

a)

4

b)

1

c)

5

d)

3

16.

Predict the products of this reaction: MgO + Li --> ?

a)

LiO + Mg

b)

MgO + Li

c)

Li2O + Mg

d)

LiMg + O

e)

MgLi + O

17.

Predict the products from this reaction: KCl + Mg --> ?

a)

MgCl2 + K2

b)

K2Mg + Cl2

c)

MgCl2 + K

d)

KCl + Mg

e)

MgCl + K

18.

Predict the products from the following reaction:

KCl + Na2SO4

a)

NaK + SO4Cl

b)

K2SO4 + NaCl

c)

KaS + ClONa

d)

KN + a

19.

In this balanced reaction, how many oxygens are there on each side?

Al(NO3)3 + 3Na --> 3NaNO3 + Al

a)

10

b)

9

c)

7

d)

3