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Science 8 Review (Chemistry) - DepEd

Total questions: 70

Worksheet time: 1hrs 10mins

Name
Class
Date
1.
What is the correct order of the states of matter?
a)
Solid, Liquid, Gas
b)
Gas, Liquid, Solid
c)
Liquid, Gas, Solid
d)
Solid, Gas, Liquid
2.
This image shows:
a)
Molecules in solid have the greatest amount of energy.
b)
Molecules in a liquid have the greatest amount of energy.
c)
Molecules in a gas have the greatest amount of energy.
d)
They have equal amounts of energy.
3.

This state of matter has a firm, unchanging physical structure.

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

4.

Which is not true about the liquid state of matter?

a)

The liquid state has a definite volume and a definite shape.

b)

The liquid state takes on the shape of its container.

c)

The liquid state has a definite volume and an indefinite shape.

d)

The particles in a liquid can easily move past each other.

5.

Which of the following statements is true regarding the particle structure of liquids? Particles of a liquid are:

a)

very close together, so the liquid cannot easily change its shape.

b)

fast-moving, so they fill the volume of their container.

c)

relatively close together, so they cannot be easily compressed.

d)

very far apart, so they have plenty of room to move around.

6.
a)

Freezing

b)

Melting

c)

Condensation

d)

Sad day for Ms. P

7.
a)
Freezing
b)
Melting
c)
Condensation
d)
Evaporation
8.
What is an example of evaporation?
a)
Water boiling
b)
Water turning into ice
c)
Chocolate bar turning into liquid chocolate
d)
Fog forming on a mirror
9.
What is an example of condensation?
a)
Water boiling
b)
Water turning into ice
c)
Chocolate bar turning into liquid chocolate
d)
Fog forming on a mirror
10.

What state of matter is pictured?

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

11.
When a substance melts, the kinetic energy _____________.
a)
decreases
b)
stays the same
c)
increases
d)
decreases then increases
12.
5. What is it called when a solid turns directly into a gas?
a)
Sublimation
b)
Condensation
c)
Liquid
13.

Change from Liquid to Solid is called ...

a)

fusion

b)

Freezing

c)

sublimation

d)

evaporation

14.
When the temperature of matter decreases the particles ...
a)
speed up and move farther apart
b)
speed up and move closer together
c)
slow down and move farther apart
d)
slow down and move closer together
15.
All changes in the state of matter of a substance requires
a)
vibration
b)
water
c)
permission
d)
energy
16.
What is deposition?
a)
Phase change from gas to solid
b)
phase change from liquid to solid
c)
Phase change from solid to gas
d)
Phase change from liquid to gas
17.

Which phase change absorbs energy to take place?

a)

freezing

b)

condensation

c)

evaporation

d)

all of the above

18.
What part of the water cycle does this picture show?
a)
condensation
b)
precipitation
c)
evaporation
19.
Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density?
a)
3 g/cm3
b)
1/3 g/cm3
c)
27 g/cm3
d)
39 g/cm3
20.
Frank has an eraser. It has a mass of 4g, and a volume of 2cm3. What is its density?
a)
8 g/cm3
b)
2 g/cm3
c)
1/2 g/cm3
d)
24 g/cm3
21.
An irregularly shaped piece of gold was lowered into a graduated cylinder holding a volume of water equal to 17 ml. The height of the water rose to 20 ml. If the mass of the gold was 27 g, what was its density?
a)
9 g/mL
b)
10.5 g/mL
c)
6.5 g/mL
d)
8 g/mL
22.
How much water has been displaced in the image shown?
a)
40 mL
b)
65 mL
c)
20 mL
d)
25 mL
23.
A lead cylinder has a mass of 540 grams and a volume of 2.70 mL.  Calculate the density of the lead cylinder. Remember to move the decimal on both sides of the problem.
a)
15 g/mL
b)
19 g/mL
c)
20 g/mL
d)
12 g/mL
24.

An object is is placed into 45 mL of water. The water rises to 48 mL. What is the volume of the object?

a)

3 mL

b)

93mL

c)

8 mL

d)

83 mL

25.
The tool used to measure the mass of a substance or object is a ______________.
a)
balance
b)
graduated cylinder
c)
ruler
d)
thermometer
26.

Calculate the density in the following question: A star has a mass of 15 g and a volume of 25 mL.

a)

0.7 g/mL

b)

0.6 g/mL

c)

0.5 g/mL

d)

0.4 g/mL

27.

A neutron has what charge?

a)

Positive

b)

Negative

c)

It has no charge (it is neutral)

28.

A proton has what charge?

a)

Positive

b)

Negative

c)

It has no charge (it is neutral)

29.

An electron has what charge?

a)

Positive

b)

Negative

c)

It has no charge (it is neutral)

30.

What subatomic particle is coloured red in this image?

a)

proton

b)

neutron

c)

electron

31.

What subatomic particles are coloured red in this image?

a)

protons

b)

neutrons

c)

electrons

32.

What subatomic particles are coloured green in this image?

a)

protons

b)

neutrons

c)

electrons

33.
What is the atomic mass of Neon?
a)
10
b)
20.18
c)
10.18
d)
20.18
34.
How many protons are in Beryllium?
a)
4
b)
9
c)
5
d)
2
35.
What is the atomic mass of Copper?
a)
63
b)
29
c)
34
d)
92
36.
How many neutrons are in a Gold atom?
a)
79
b)
196
c)
118
d)
275
37.
How many electrons does a Copper atom have?
a)
63
b)
29
c)
92
d)
34
38.
What is the atomic mass of Gold?
a)
79
b)
196.9665
c)
117
d)
275
39.
What is the atomic weight of Helium
a)
4
b)
2
c)
6
d)
1
40.

Which element is this?

a)

Nickel

b)

Neon

c)

Sodium

d)

Nitrogen

41.

Name this element.

a)

Argon

b)

Chlorine

c)

Aluminum

d)

Boron

42.

Name this element.

a)

Neon

b)

Magnesium

c)

Sodium

d)

Manganese

43.

What is the atomic number of this atom?

a)

2

b)

4

c)

6

d)

8

44.

What is this element?

a)

Beryllium (atomic #4)

b)

Boron (atomic #5)

c)

Carbon (atomic #6)

d)

Nitrogen (atomic #7)

45.

How many valence electrons?

a)

2

b)

3

c)

4

d)

5

46.

Whose model suggested that negative particles were mixed in with positively charged material - like seeds in a watermelon?

a)

J.J. Thomson

b)

Ernest Rutherford

c)

Niels Bohr

d)

Albert Einstein

47.

Who discovered that the atom had an small, dense, positively charged center?

a)

Ernest Rutherford

b)

J.J Thomson

c)

Robert Millikan

d)

John Dalton

48.

Place the following atomic models in order, from earliest to latest:


A) Rutherford B) Thomson C) Dalton

a)

B, C, A

b)

C, A, B

c)

A, C, B

d)

C, B, A

49.
What can you conclude from the fact that scientists continue to update the atomic model?
a)
New information about atoms continues to be discovered
b)
Old information about atoms is completely useless
c)
Scientists did not have any information about atoms until a few years ago
d)
Scientists still have no idea what atoms look like
50.

Who named the positive center of the atom the "nucleus?"

a)

Democritus

b)

Dalton

c)

Thomson

d)

Rutherford

51.

Which scientists believed an atom was indivisible? (Choose all correct responses.)

a)

Democritus

b)

Dalton

c)

Thomson

d)

Rutherford

52.

Which scientist first suggested that atoms could join?

a)

Democritus

b)

Dalton

c)

Thomson

d)

Rutherford

53.

In the atomic model nicknamed the "plum pudding" model, what do the plums represent?

a)

the nucleus

b)

the atom

c)

the electrons

d)

the positive material

54.

Who proposed that electrons move around the nucleus in circular orbits?

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

55.

A green powder is heated & a gas is given off while it turns to a black solid. This describes

a)

Physical Change

b)

Chemical Change

c)

Change in State

d)

Change in Temperature

56.

A Chemical Change is also known as what?

a)

Physical Change

b)

Physical Property

c)

Chemical Reaction

d)

Chemical Property

57.

The difference between a Physical change and a Chemical change is…

a)

Physical change is only a change to the outside appearance.

b)

Chemical change is when matter is changed into something new.

c)

Atoms are rearranged in chemical changes & not in physical.

d)

All are correct.

58.

Identify what type of change happening in the picture below...

a)

Chemical Change

b)

Physical Change

c)

Endothermic Reaction

d)

Exothermic Reaction

59.

Identify what type of change happening in the picture below...

a)

Chemical Change

b)

Physical Change

c)

Endothermic Reaction

d)

Exothermic Reaction

60.

Identify what type of change happening in the picture below...

a)

Chemical Reaction

b)

Physical Change

c)

Change in State

d)

Change in appearance only

61.

The Period is -

a)

the row -->

b)

the column |

62.

The Group is -

a)

the row -->

b)

the column |

63.

With the exception of Hydrogen, everything on the left <-- side of the zig-zag (river) line is a -

a)

metal

b)

nonmetal

c)

metalloid

64.

With the exception of Hydrogen, everything on the right --> side of the zig-zag (river) line is a -

a)

metal

b)

nonmetal

c)

metalloid

65.

The zig-zag (river) line represents the -

a)

metals

b)

nonmetals

c)

metalloids

66.

In the periodic table, the elements are classifies acording to...

a)

The atomic number

b)

The mass number

c)

The electronic number

d)

The number of neutrons

67.

Which of these is a noble gas?

a)

Chlorine (Cl)

b)

Hydrogen (H)

c)

Neon (Ne)

d)

Fluorine (F)

68.
Sodium (Na) is found in period 
a)
3
b)
2
c)
4
d)
1
69.
Sodium (Na) is found in group 
a)
1
b)
2
c)
3
d)
4
70.

The horizontal (side to side) rows in the Periodic Table are called

a)

groups

b)

families

c)

periods

d)

atomic numbers

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