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Chemical Reactions and Balancing Review 1

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.
2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH
a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

2.

How quickly a reaction will take place.

a)

Reaction Rate

b)

Temperature Rate

c)

Equation Rate

d)

Bubbly Rate

3.

To balance an equation you should:

a)

ONLY change subscripts.

b)

ONLY change coefficients.

c)

Change BOTH subscripts and coefficients.

4.
Na3PO4 + 3 KOH ----> 3 NaOH + K3PO4
a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

5.
2 RbNO3 + BeF2 ----> Be(NO3)2 + 2 RbF
a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

6.

Is this equation balanced?

a)

Yes

b)

No

7.

How many Hydrogen (H) and how many Chlorine (Cl) are there?

a)

H = 4, Cl = 1

b)

H = 4, Cl = 0

c)

H = 4, Cl = 3

d)

H = 4, Cl = 4

8.
2 C5H5 + Fe ----> Fe(C5H5)2
a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

9.
O3  ----> O. + O2
a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

10.

Is the compound in the pink box a Reactant or a Product?

a)

Reactant

b)

Product

11.
2 NO2 ----> 2 O2 + N2
a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

12.

How many Nitrogen (N) atoms are in 4NH3?

a)

4

b)

1

c)

3

d)

12

13.

What is the correct "inventory" for 3Al2O4

a)

Al = 6 O = 4

b)

Al = 6 O = 12

c)

Al = 2 O = 4

d)

Al = 3 O = 4

14.

Which type of chemical reaction has two or more reactants to make one product?

a)

combustion

b)

single replacement

c)

double replacement

d)

synthesis

e)

decomposition

15.

What reaction has the following general formula:

AB --> A + B

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

16.

process by which the atoms of one or more substances are rearranged to form different substances

a)

Chemical Reaction

b)

Chemical Property

c)

Physical Reaction

d)

Physical Property

17.

What reaction has the following general formula:

A + CD --> C + AD

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

18.

What reaction has the following general formula:

A + B --> AB

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

19.

Which chemical reaction always starts with a hydrocarbon that reacts with oxygen and produces carbon dioxide and water?

a)

Decomposition

b)

Synthesis

c)

Combustion

d)

Single Replacement

20.

Which phrase describes what happens to atoms in a chemical reaction?

a)

never lost or gained, just rearranged

b)

sometimes lost, never rearranged

c)

sometimes lost, gained, or rearranged

d)

lost or gained, never rearranged

21.
In a chemical reaction, everything to the right of the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
22.
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
23.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
24.
2 NH3+ 1 H2SO4 ----> 1 (NH4)2SO4
a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

25.

Which of the following is a compound?

a)

zinc (Zn)

b)

magnesium (Mg)

c)

sodium chloride (NaCl)

d)

potassium (K)

26.

Which of the following is an element?

a)

potassium chloride (KCl)

b)

water (H2O)

c)

carbon (C)

d)

calcium carbonate (CaCO3)

27.

Chemical reactions that release energy in the form of heat

a)

Exothermic

b)

Endothermic

c)

Exogonic

d)

Endergonic

28.

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

29.

What is the general reaction scheme for a combustion  reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

CxHy+O2 −> CO2+H2OC_xH_y+O_2\ ->\ CO_2+H_2O

30.

What type of reaction is the following:
2KI −> 2K + I22KI\ ->\ 2K\ +\ I_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

31.

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

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.

In the equation shown, what are the product(s)?

a)

N2 + H2

b)

NH3

34.

If a chemical reaction produces light or sound, it is likely a _____ reaction.

a)

EXERgonic

b)

ENDERgonic

35.

What type of reaction is the following:
Zn + 2HCl −> ZnCl2+H2Zn\ +\ 2HCl\ ->\ ZnCl_2+H_2

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

36.

The energy required to start a chemical reaction is ___.

a)

endothermic

b)

exothermic

c)

activation

d)

released

37.

Energy is _____ when new bonds form.

a)

absorbed

b)

released

c)

lost

d)

gained

38.

Energy is ______ when bonds break.

a)

gained

b)

lost

c)

released

d)

absorbed

39.

An _______ reaction is when more energy is released than is absorbed. This energy can be in the form of light, heat, electricity, etc.

a)

endothermic

b)

endergonic

c)

exothermic

d)

exergonic

40.

How many Potassium (K) atom are there?

a)

1

b)

2

c)

3

d)

4

41.

An _______ reaction is when more thermal energy is absorbed than is released.

a)

endothermic

b)

endergonic

c)

exothermic

d)

exergonic

42.

An _______ reaction is when more thermal energy is released than is absorbed.

a)

endothermic

b)

endergonic

c)

exothermic

d)

exergonic

43.
How many Oxygens are in this molecule? 
(OH)2
a)
4
b)
1
c)
2
d)
3
44.

The ending substances; what is made

a)

Products

b)

Reactants

c)

Equations

d)

sentences

45.

A chemist is doing an ENDOthermic reaction. The starting temperature was 25 degrees Celsius. Which of the following would be a reasonable ending temperature

a)

44 degrees

b)

30 degrees

c)

15 degrees

d)

25 degrees

46.
The Law of Conservation of Energy states that__________
a)
The overall amount of energy remains the same but some energy is completely destroyed during energy transformations
b)
The overall amount of energy remains the same energy cannot be created or destroyed.
c)
The overall amount of energy can change depending on the energy conversions that take place. 
d)
The overall amount of energy can change because sometimes energy is lost to the environment 
47.

_____ reactions usually feel hot!

a)

endothermic

b)

exothermic

48.

In an endothermic reaction, energy is _________.

a)

absorbed

b)

released

49.

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

a)

Endothermic

b)

Decomposition

c)

Exothermic

d)

Indothermic

50.
P4 +  3 O2 ----> 2 P2O3
a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

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