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Unit 1 Parts 3 & 4 Practice Test

Total questions: 74

Worksheet time: 2hrs 2mins

Name
Class
Date
1.
Which of the following models best demonstrates a balanced chemical equation?
a)

F

b)

G

c)

H

d)

J

2.
The reactants are on the left side of the chemical equation.
a)
True
b)
False
3.

How many atoms in all are in a molecule of serotonin (C10H12N2O)?

a)

22

b)

24

c)

25

d)

4

4.

Is this balanced? 2HgO → 2Hg + O2

a)

Yes

b)

No

5.

Is this balanced? Al + O2 → 2Al2O3

a)

Yes

b)

No

6.

If an element is diatomic, what is the subscript?

a)

1, always

b)

2, only when it is an element

c)

it shouldn't have a subscript, it should have a coefficent

d)

2, when bonded in a compound

7.

What is the symbol for a substance dissolved in solution?

a)

(s)

b)

(l)

c)

(aq)

d)

(g)

8.

What type of reaction is this?

2 C6H14 + 19 O2 → 12 CO2 + 14 H2O

a)

Single Replacement

b)

Double Replacement

c)

Combustion

d)

Decomposition

9.

What type of reaction is this?

Zn + 2HCl --> ZnCl2 + H2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

10.

In what type of reaction do compounds break down into simpler substances?

a)

Double Replacement

b)

Single Replacement

c)

Synthesis

d)

Decomposition

11.

What type of reaction is this?

CO2 + H2O --> H2CO3

a)

Decomposition

b)

Single Replacement

c)

Synthesis

d)

Combustion

12.

How many TOTAL atoms are in: H2SO4

a)

6

b)

5

c)

7

d)

3

13.
What is decomposition?
a)
putting substances together
b)
breaking substances apart
c)
element replacing another element in a compoud
d)
burning of a subtance
14.
Exothermic reactions...
a)

Absorb energy

b)

Release energy

c)

Release Color

d)

Absorb Color

15.

Balance the following reaction:

___C3H8 +___O2 --> ___CO2 + ___H2O

a)

1,5,3,4

b)

2,10,6,8

c)

already balanced

d)

1,5,5,4

16.

Balance the following reaction:

__Al + __Fe3N2 -->__AlN + __Fe

a)

already balanced

b)

4,2,4,6

c)

2,1,2,3

d)

1,2,1,3

17.
In an endothermic reaction, heat is ...
a)

taken in or absorbed

b)

given out or released 

18.

Baking bread and cooking an egg are examples of what type of reaction?

a)

Endothermic processes

b)

Exothermic processess

c)

None of these 

19.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
20.
What types of reactions absorb and release heat?
a)
acidic and basic
b)
endothermic and exothermic
c)
endothermic and heat transfusion
d)
covalent and ionic
21.

How would you write 0.0005 in scientific notation?

a)

50 x 10-5

b)

5 x 10-4

c)

5 x 103

d)

.5 x 103

22.

How would you write 4.3756 x 104 in standard form?

(a)  

23.

How would you write -5.6 x 10-3 in standard form?

(a)  

24.
Scientific Notation is made up of two number parts. The first part should be a number between 1 and 100.
a)
True
b)
False
25.

Which of the following numbers is written in scientific notation?

a)

20.35 x 104

b)

.2035 x 104

c)

2035 4

d)

2.035 x104

26.

Express the following in scientific notation:


.000457

a)

457 x 106

b)

457 x 10-6

c)

4.57 x104

d)

4.57 x 10-4

27.

Convert to scientific notation:


520,000,000

a)

52 x 107

b)

5.2 x 10-7

c)

5.2 x 108

d)

0.52 x 109

28.

What is scientific notation?

a)

A long way to write really short numbers

b)

A short way to write really large or really small numbers

c)

I don't know...

d)

None of the above

29.

If the exponent is a positive number the original number was...

a)

a really big number.

b)

a really small number.

30.

If the exponent is a negative number the original number was...

a)

a really large number.

b)

a really small number.

31.

Which value is the greatest?

a)

5.0 x 10-9

b)

5.0 x 10-4

c)

5.0 x 106

d)

5.0 x 108

32.

Which number is the least in value?

a)

5.0 x 10-9

b)

5.0 x 10-4

c)

5.0 x 106

d)

5.0 x 108

33.

Base change litmus paper to blue.

a)

True

b)

False

34.

A characteristic of acids is that they have a sour taste.

a)

True

b)

False

35.

How do the taste of acids taste compared to the taste of bases?

a)

Acid is sweet and base is sour

b)

Acid is bitter and base is sour

c)

Acid is sour and base is bitter

36.

Choose the correct answer. Acid or base?

a)

Acid

b)

Base

37.

Choose the correct answer. Acid or base?

a)

Acid

b)

Base

38.

Choose the correct answer. Acid or base?

a)

Acid

b)

Base

39.

Choose the correct answer. Acid or base?

a)

Acid

b)

Base

40.
Which of the following pH numbers indicates a neutral substance?
a)
1
b)
5
c)
7
d)
14
41.
Which of the following pH numbers indicates a strong acid?
a)
1
b)
5
c)
7
d)
14
42.

Which of the following pH numbers indicate a strong base?

a)

1

b)

5

c)

7

d)

14

43.

What substance could you use to test if a substance is an acid or a base?

a)

Indicator

b)

Salt

c)

Catalyst

d)

Water

44.
When dissolved in water, acids produce:
a)
bases
b)
salts
c)
 hydrogen (H+) ions
d)
 hydroxide (OH-) ions
45.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-14
d)
1-20
46.

When dissolved in water, bases produce:

a)

bases

b)

salts

c)

hydrogen (H+) ions

d)

hydroxide (OH-) ions

47.

What type of reaction has the general form:

AB + CD → AD + CB

a)

Double Replacement

b)

Single Replacement

c)

Synthesis

d)

Decomposition

48.

What type of reaction is this:

Cl2 + 2KI →  I2 + 2KCl

a)

Synthesis

b)

Single displacement

c)

Double displacement

d)

Decomposition

49.

What type fo reaction is this?

2 C5H5 + Fe → Fe(C5H5)2

a)

single displacement

b)

double displacement

c)

decomposition

d)

synthesis

50.

What type of reaction is this?

2 RbNO3 + BeF2 → Be(NO3)2 + 2 RbF

a)

single displacement

b)

double displacment

c)

decomposition

d)

synthesis

51.

What type of chemical reaction breaks down 1 substance into 2 substances?

a)

Double displacement

b)

Single displacement

c)

Synthesis

d)

Decomposition

52.

Which of the following reactions is an example of synthesis?

a)

Na + Br2 --> NaBr

b)

KClO3 --> KCl + O2

c)

HgO + Cl2-->HgCl + O2

d)

Cl2 + NaBr --> NaCl + Br2

53.

What type of reaction is this?

2 AgNO3 + Cu → Cu(NO3)2 + 2 Ag 

a)

single displacement

b)

double displacement

c)

decomposition

d)

synthesis

54.

What type of chemical reaction has this general form:

A + BC → B + AC

a)

Single Replacement

b)

Decomposition

c)

Double Replacement

d)

Synthesis

55.

What type of chemical reaction is this?

NO2 → N2 + O2

a)

Synthesis (combination)

b)

Decomposition

c)

Single replacement

d)

Combustion

56.

A reaction that has a negative ΔH value.

a)

endothermic

b)

exothermic

57.

ΔH is greater than zero.

a)

endothermic

b)

exothermic

58.

ΔH = + 300 kJ

a)

endothermic

b)

exothermic

59.

ΔH = - 100 kJ

a)

endothermic

b)

exothermic

60.

The prefix "endo" means

a)

"in"

b)

"out"

c)

"up"

d)

"down"

61.

The prefix "exo" means

a)

"in"

b)

"out"

c)

"up"

d)

"down"

62.
What type of reaction is shown in the reaction pathway?
a)

Endothermic

b)

Exothermic

63.
What type of reaction is shown in the reaction pathway?
a)

Endothermic

b)

Exothermic

64.

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

a)

Endothermic

b)

Exothermic

65.

When calcium reacts with water, the temperature changes from 18°C to 39°C. Which statement is correct?

a)

The reaction is exothermic

b)

The reaction is endothermic

66.

What letter represents the energy of the products?

a)

A

b)

B

c)

C

d)

D

67.

Which letter corresponds to the energy of the reactants?

a)

A

b)

B

c)

C

d)

D

68.

Which letter corresponds to the activation energy of the reaction?

a)

A

b)

B

c)

C

d)

D

69.

"When heated, solid mercury(II) oxide decomposes into mercury liquid and oxygen gas."

What is the correct skelton equation for this reaction?

a)

Hg (l) + O2 (g) --> Hg2O (s)

b)

Hg2O (s) --> Hg (l) + O (g)

c)

HgO (s) --> Hg (l) + O2 (g)

70.

"Water and sulfur trioxide vapor combine to form sulfuric acid (or hydrogen sulfate solution)."

Which is the correct skeleton equation?

a)

H2SO4 (s) --> H2O (l) + S3O (g)

b)

H2O (aq) + SO3 (g) --> H2SO4 (s)

c)

H2O (l) + S3O (v) --> H2SO4 (aq)

d)

H2O (l) + SO3 (g) --> H2SO4 (aq)

71.

"Solid zinc oxide is produced by combining zinc powder with oxygen gas."

What is the correct skeleton equation for this reaction?

a)

ZnO (s) --> Zn (s) + O2 (g)

b)

ZnO (s) --> Zn + O (g)

c)

Zn (s) + O2 (g) --> ZnO (s)

d)

Zn + O --> ZnO

72.

What are the 7 elements are always found as diatomics (two bonded together, like X2) when they are in their pure form (not part of a compound)?

a)

Br, I, N, Cl, H, O, F

b)

B, I, N, C, H, O, F

c)

B, R, O, F, In, C, H

d)

Br, I, Ni, C, Ho, F

73.

Choose the most correct sentence to describe the following reaction:

Fe(s) + O2(g) --> Fe2O3(s)

a)

An iron solution forms oxygen gas and solid iron oxide.

b)

Solid iron and oxygen gas react to form solid iron(III) oxide.

c)

Solid iron and oxygen make iron oxide.

d)

Iron and dioxygen gas produce solid iron(II) oxide.

74.

Choose the most correct sentence to describe the following reaction:

NH3(g) + O2(g) --> NO(g) + H2O(g)

a)

Ammonia and oxygen form nitrogen and water

b)

Nitrogen trihydride and oxygen gases react to form nitrogen monoxide gas and water vapor.

c)

Nitrogen hydride gas and dioxygen gas produce nitrogen oxide and water when mixed.

d)

Nitrogen trihydride and oxygen react to make nitrogen oxide and dihydrogen monoxide.

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