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Science 7 - Midterm Review

Total questions: 136

Worksheet time: 6hrs 20mins

Name
Class
Date
1.
a)

solvent

b)

solute

2.

solute + solvent =

a)

solution

b)

equation

3.

Solutes dissolve quicker in _________ water.

a)

cold

b)

warm

4.

Solutes dissolve quicker if you stir them.

a)

true

b)

false

5.
a)

solution

b)

solute

c)

solvent

6.
The substance being dissolved in a solution.
a)
sands
b)
solute
c)
solvent
d)
alloy
7.
The substance in which a solute is dissolved
a)
sands
b)
solvent
c)
alloy
d)
negative particles
8.
Solubility is defined as
a)
the ability to catch on fire
b)
the ability to be dissolved
c)
the ability to fly.
d)
the ability to get on Mrs. D's nerves.
9.

In which beaker does salt dissolves faster?

a)

Hot water

b)

Room temperature

c)

Ice watet

10.
a)

Element

b)

Compound

c)

Mixture

11.
a)

Element

b)

Compound

c)

Mixture

12.
a)

Element

b)

Compound

c)

Mixture

13.
a)

Element

b)

Compound

c)

Mixture

14.
a)

Compound

b)

Element

c)

Mixture

15.
a)

Mixture

b)

Compound

c)

Element

16.
a)

Element

b)

Compound

c)

Mixture

17.
a)

Element

b)

Compound

c)

Mixture

18.
a)

Element

b)

Compound

c)

Mixture of elements and compounds

d)

Mixture of elements

19.
a)

Compound

b)

Mixture of elements and compounds

c)

Mixture of elements

d)

Mixture of compounds

20.
a)

Element

b)

Compound

c)

Mixture of elements

d)

Mixture of compounds

21.

Where is a Valence electron located?

a)

The innermost shell

b)

The nucleus

c)

The outmost shell

22.

A __________ goes up and down on the periodic table.

a)

Group

b)

Period

23.

A _________ goes side to side on the periodic table.

a)

Group

b)

Period

24.

What element is in group 1, period 4?

a)

K - Potassium

b)

V - Vandium

c)

C - Carbon

d)

Ti - Titanium

25.

What two elements are in the same Period?

a)

K - Potassium and Na - Sodium

b)

Li - Lithium and Mg - Magnesium

c)

B - Boron and C - Carbon

d)

Zn - Zinc and N - Nitrogen

26.

Which two elements would have similar properties?

a)

Ar - Argon and Xe - Xenon

b)

Og - Oganesson and Lu - Lutetium

c)

He - Helium and Lu - Lutetium

d)

Ar - Argon and Se - Selenium

27.

What element is in group 2, period 6?

a)

Sr - Strontium

b)

Ba - Barium

c)

S - Sulfur

d)

O - Oxygen

28.

How many Valence electrons does Magnesium (Mg) have?

a)

3

b)

2

c)

6

d)

56

29.

The _________ tells us how many valence electrons an element has.

a)

Group

b)

Period

c)

Atomic Number

d)

Element

30.

How many valence electrons does an element want to have, in order to be stable?

a)

0

b)

10

c)

2

d)

8

31.

How many valence electrons does this atom have?

a)

4

b)

2

c)

6

32.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
33.

In an endothermic reaction, heat is ...

a)

taken in

b)

given out

34.

If a chemical reaction is EXOTHERMIC, the temperature of the surrounding would....

a)

Stay the same

b)

Increase (feel hot)

c)

Decrease (feel cold)

35.
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 
a)
Warm
b)
Cold
36.

The illustration shows cell respiration. Is the overall reaction of cell respiration an Endothermic or an Exothermic reaction?

a)

Endothermic

b)

Exothermic

37.

Baking bread and cooking an egg require an input of heat. These would be examples of....?

a)

Endothermic processes

b)

Exothermic processess

c)

None of these

38.

What instrument would you use to detect an endothermic or exothermic reaction?

a)

triple beam balance

b)

ruler

c)

thermometer

39.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
bubbles of gas appear
d)
dissolving
40.

During chemical reactions, bonds are...

a)

broken only

b)

formed only

c)

both broken and formed

d)

none of the above are correct

41.

What type of reaction is represented by the energy graph?

a)

Endothermic

b)

Exothermic

42.

What type of reaction is represented by the energy graph?

a)

Endothermic

b)

Exothermic

43.

The name Democritus gave us the smallest possible particle of matter is

a)

molecule

b)

atom

c)

electron

d)

proton

44.

J.J. Thomson discovered the negative charged subatomic particle called the

a)

neutron

b)

nucleus

c)

electron

d)

proton

45.

The small dense center of the atom is called the

a)

neutron

b)

nucleus

c)

electron

d)

proton

46.

The nucleus of an atom contains

a)

neutrons, only

b)

electrons and neutrons

c)

protons, only

d)

protons and neutrons

47.

The positive subatomic particles in the nucleus of an atom are called the

a)

neutrons

b)

electrons

c)

protons

d)

isotope

48.

The number of protons in the nucleus of an atom is called the

a)

mass number

b)

atomic mass

c)

configuration

d)

atomic number

49.

Atoms with the same number of protons, but different number of neutrons are called

a)

isotopes

b)

neutral

c)

ions

d)

isolines

50.

The sum of the protons and neutrons in an atom is called the

a)

atomic number

b)

atomic mass

c)

mass number

d)

isotope number

51.

The number of protons in an atomic with an atomic number of 17 is

a)

17

b)

34

c)

18

d)

8

52.

Niels Bohr found that electrons move in definite orbits around the

a)

element

b)

atom

c)

nucleus

d)

sun

53.

Using the Periodic Table of Elements, how many neutrons are in a neutral atom of nitrogen?

MAN: Mass Number - Atomic Number = Number of Neutrons

a)

14

b)

7

c)

8

d)

15

54.

Using the periodic table of elements, how many electrons in a neutral atom of carbon?

a)

12

b)

5

c)

6

d)

13

55.

This scientist used Alpha Particles and Gold Foil to discover the nucleus of the atom.

a)

JJ Thomson

b)

James Chadwick

c)

Ernest Rutherford

d)

Niels Bohr

56.

James Chadwick discovered the

a)

neutron

b)

proton

c)

electron

d)

nucleus

57.

Which isotope of Hydrogen has the largest number of neutrons?

a)

H-1

b)

H-2

c)

H-3

58.

What is the mass number of an atom with 9 protons, 11 neutrons and 9 electrons?

a)

9

b)

11

c)

20

d)

29

59.

Using the Periodic Table of Elements, which element has an atomic number of 16?

a)

Oxygen

b)

Carbon

c)

Sulfur

d)

Chlorine

60.

( Fill in the blank) Long hair should be ____________ in the laboratory.

a)

tied back

b)

cut

c)

down

d)

curled

61.

(True or False) Horse playing is allowed in the laboratory

a)

true

b)

false

62.

(True or False) It is okay to pick up broken glass with your bare hands as long as the glass is placed in the trash can

a)

true

b)

false

63.
After completing an experiment, all chemical wastes should be
a)
dumped down sink
b)
taken home
c)
thrown in trash
d)
disposed of according to teacher's directions
64.
You have been injured in the laboratory (cut, burn, etc.). First you should
a)
visit school nurse
b)
text your parent
c)
see a doctor after school
d)
tell teacher immediatly
65.
The proper technique for smelling chemicals is ______________
a)
keeping your nose close to the glassware
b)
wafting
c)
to sniff only a small amount
d)
Trick question; you never are allowed to smell chemicals in class
66.
Keeping your work area neat and clean is important because:
a)
My teacher is a neat-freak
b)
I won't lose my supplies in the clutter.
c)
It keeps the room from looking messy.
d)
It helps prevent accidents.
67.

The following footwear is the best in the laboratory

a)

sandals

b)

open-toed shoes

c)

closed-toe shoes

d)

shoes appropriate for the weather

68.

After completing an experiment, all wastes should be

a)

taken home

b)

tossed in the trash can

c)

disposed of according to your teacher's directions

d)

left out for someone else to clean

69.

How many atoms of Hydrogen are in H2O

a)

1

b)

2

c)

3

d)

more than 3

70.

How many different elements are present in H2COCH2

BE CAREFUL: Look at how many different symbols there are. Some elements are repeated.

a)

5

b)

4

c)

3

d)

2

71.

Calculate the number of Oxygen atoms in Al(OH)3

a)

1

b)

2

c)

3

d)

4

72.

How many Magnesium atoms are in 10MgCl2?

a)

10

b)

5

c)

20

73.

How many atoms are there TOTAL in H2SO4 ?

a)

6

b)

5

c)

7

d)

3

74.

How many Sodium atoms are in 6NaCl?

a)

1

b)

12

c)

6

75.

What determines the reactivity of an element?

a)

protons

b)

neutrons

c)

electrons

d)

valence electrons

76.

How many atoms of Hydrogen are in this compound?

a)

1

b)

2

c)

3

d)

4

77.

NaCl is the chemical formula for salt. Is NaCl considered a compound or an element?

a)

element

b)

compound

c)

both

d)

neither

78.

We breathe oxygen. Its chemical formula is O2. Is this formula an element or a compound?

a)

element

b)

compound

c)

neither

d)

both

79.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
80.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
81.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
82.

Which formula shows four atoms of hydrogen?

a)

H20

b)

2H4

c)

H3

d)

2H2

83.

milk solution

a)

Homogeneous

b)

Heterogeneous

84.

mixed toys in the room

a)

Homogeneous

b)

Heterogeneous

85.

paper clips and pins

a)

Homogeneous

b)

Heterogeneous

86.

Yogurt Parfait

a)

Homogeneous

b)

Heterogeneous

87.
Balance this equation:
 2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
88.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
89.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
90.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
91.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Reactant
d)
Subscript
92.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Reactant
d)
Subscript
93.

What coefficient should be placed in front of the Hydrogen in the reactants to balance this equations?

____ H2 + O2 -> 2 H2O

a)

1

b)

2

c)

3

d)

0

94.
Is the following equation balanced or unbalanced ? 
Al + O2 --> Al2O3
a)
Balanced
b)
Unbalanced
95.

The following reaction is an example of what reaction type?  CoCO3 → CoO + CO2

a)

synthesis

b)

decomposition

c)

replacement

d)

combustion

96.

The following reaction is an example of what reaction type?  Si + S8 --> Si2S4

a)

synthesis

b)

decomposition

c)

replacement

d)

combustion

97.

The following reaction is an example of what reaction type? 

AB + C --> AC + B

a)

synthesis

b)

decomposition

c)

replacement

d)

combustion

98.

The following reaction is an example of what reaction type? 

3 Pb + 2 H3PO4 → 3 H2 + Pb3(PO4)2

a)

synthesis

b)

decomposition

c)

replacement

d)

combustion

99.
Which of these is a property of metals?
a)
It's malleable
b)
It can't conduct electricity
c)
They are used in food
d)
It's very brittle
100.
Which of these grouping of elements could have the characteristic of brittle?
a)
Metal
b)
Nonmetal
101.
Which of the following is a good conductor of heat?
a)
Metal
b)
Nonmetal
c)
Metalloid
102.
Iron is a good conductor, malleable and magnetic. What type of element is Iron? 
a)
Metal
b)
Nonmetal
c)
Metalloid
d)
Pretty
103.
Silicon is a semiconductor and has properties of both metals and nonmetals. What type of element is Silicon? 
a)
Metal
b)
Nonmetal
c)
Metalloid
d)
Pretty
104.
Which elements are found on the right side of The Periodic Table?
a)
Metals
b)
Nonmetals
c)
Metalloids
d)
Water
105.
Anytime you see the word SEMICONDUCTOR - what substance do you have?
a)
Metal
b)
Nonmetal
c)
Metalloid
106.
What is the name of this element?
a)
Helium
b)
Hydrogen
c)
Argon
d)
Silver
107.

What element is represented in this Bohr Model?

a)

Carbon

b)

Hydrogen

c)

Aluminum

d)

Lithium

108.
What is the name of this element?
a)
Lithium
b)
Boron
c)
Carbon
d)
Neon
109.
What is the mass number of this atom?
a)
1
b)
3
c)
4
d)
7
110.
What is the atomic number of this atom?
a)
2
b)
4
c)
6
d)
none of the above
111.
Isotopes are elements with a different amount of
a)
protons
b)
neutrons
c)
electrons
d)
atoms
112.
an element will always have the same number of 
a)
neutrons
b)
protons
c)
isotopes
d)
atoms
113.
How are electrons arranged in an atom?
a)
In groups of five
b)
In energy levels
c)
By color
d)
By shape
114.

What is the atomic number of this element?

a)

17

b)

18

c)

35

d)

35.453

115.

How many electrons can fit on the 1st energy level (orbital) for any Bohr Model?

a)

2

b)

6

c)

8

d)

10

116.

What is the mass number of this atom of Chlorine?

a)

17

b)

18

c)

35

d)

35.453

117.
What does the nucleus of an atom contain?
a)
Electrons and neutrons
b)
Protons and neutrons
c)
Neutrinos and positrons
d)
Electrons and megatrons
118.

Which subatomic particle has a positive charge?

a)

proton

b)

neutron

c)

electron

d)

midichlorian

119.

Which subatomic particle has a negative charge?

a)

proton

b)

neutron

c)

electron

d)

cybertron

120.

What is the center of an atom called?

a)

The headquarters

b)

The centrometer

c)

The hypothesis

d)

The nucleus

121.

The nucleus of an atom contains which subatomic particles?

a)

protons and electrons

b)

protons and neutrons

c)

electrons and neutrons

d)

protons, electrons, and neutrons

122.

Typically in an atom, which two subatomic particles are equal in number?

a)

protons and neutrons

b)

all subatomic particles are equal in number

c)

neutrons and electrons

d)

protons and electrons

123.

An element is defined by its number of ...

a)

protons

b)

electrons

c)

neutrons

d)

protons + electrons

124.

Adding or subtracting electrons changes the elements overall charge and makes the element change into an...

a)

ion

b)

mixture

c)

isotope

d)

neutral atom

125.

When an atom loses a valence electron, it becomes a _____________ ion.

a)

positive

b)

negative

c)

neutral

d)

polyatomic

126.

When an atom gains a valence electron, it becomes a _____________ ion.

a)

positive

b)

negative

c)

neutral

d)

polyatomic

127.

What types of elements are in covalent compounds?

a)

Metals and nonmetals

b)

Only metals

c)

Only nonmetals

128.

What types of elements are in ionic compounds?

a)

At least one metal and one nonmetal

b)

Only nonmetals

c)

Only metals

129.

When an atom transfers one or more valence electrons to another atom, what type of bond is formed?

a)

Covalent

b)

Ionic

130.

When an atom shares one or more valence electrons to another atom, what type of bond is formed?

a)

Covalent

b)

Ionic

131.

Which chemical tastes bitter?

a)

Acid

b)

Base

132.

Which chemical tastes sour?

a)

Acid

b)

Base

133.

Which is the stronger acid?

a)

pH 1

b)

pH 4

c)

pH 8

d)

pH 13

134.

Which type of substance has a high amount of Hydrogen (H+) ions?

a)

Acid

b)

Base

135.

Which type of substance has a high amount of Hydroxide (OH-) ions?

a)

Acid

b)

Base

136.

Which type of reaction is represented by the following equation:

Acid + Base --> Salt + Water

a)

Acidification

b)

Neutralization

c)

Nullification

d)

Alkalinization

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