Grade 8 Midterm Science

Front 1

Physical or Chemical change

Burning paper

Back 1

Chemical

Front 2

Physical or Chemical change

Boiling Water

Back 2

Physical

Front 3

Physical or Chemical change

Dissolving salt in water

Back 3

Physical

Front 4

Physical or Chemical change

Baking Cookies

Back 4

Chemical

Front 5

Name the element

Na

Back 5

Sodium

Front 6

Name the element

Cu

Back 6

Copper

Front 7

Name the element

Ag

Back 7

Silver

Front 8

Name the element

N

Back 8

Nitrogen

Front 9

Name the element

K

Back 9

Potassium

Front 10

Name the element

O

Back 10

Oxygen

Front 11

Name the element

Pb

Back 11

Lead

Front 12

Name the element

Sn

Back 12

Tin

Front 13

Name the element

Au

Back 13

Gold

Front 14

Name the element

Al

Back 14

Aluminum

Front 15

Name the element

He

Back 15

Helium

Front 16

Substances that CANNOT be broken down chemically into other substances are

Back 16

Elements

Front 17

The measurement of the force of gravity on an object is the object’s

Back 17

Weight

Front 18

The measurement of how much matter an object contains is its

Back 18

Mass

Front 19

The measurement of how much mass is contained in a given volume is called

Back 19

Density

Front 20

All elements are composed of extremely small particles called

Back 20

Atoms

Front 21

Anything that has mass and takes up space is called

Back 21

Matter

Front 22

The SI unit for mass is the

Back 22

Kilogram

Front 23

Term that means metals can be pulled into thin strands or wires

Back 23

Ductile

Front 24

Which particles in an atom are in the nucleus?

Back 24

Protons and Neutron

Front 25

The number of protons in the nucleus of an atom.

Back 25

Atomic number

Front 26

A row across the periodic table is called a

Back 26

Period

Front 27

What natural event provides enough energy for the nuclear fusion reactions that create the heaviest elements?

Back 27

Supernova

Front 28

To make most synthetic elements, scientists use powerful machines called

Back 28

Particle accelerator

Front 29

The sun is made up mostly of

Back 29

Hydrogen

Front 30

In an atom, the number of protons equals the number of

Back 30

electrons

Front 31

Which parts of the atom move around the nucleus?

Back 31

Electrons

Front 32

Which group of elements shares characteristics with both metals and nonmetals?

Back 32

metalloids

Front 33

Which particles in atoms have a negative electric charge?

Back 33

Electrons

Front 34

Fluorine, chlorine, bromine, and iodine are part of a family called

Back 34

Halogens

Front 35

definite volume and a definite shape

Back 35

Solids

Front 36

The resistance of a liquid to flowing is its

Back 36

Viscosity

Front 37

According to Boyle’s law, when the pressure of a gas increases at constant temperature, its volume

Back 37

Decreases

Front 38

A solid turns directly into a gas

Back 38

Sublimation

Front 39

The surface of water can act like a sort of skin due to a property of liquids called

Back 39

Surface tension

Front 40

The change from liquid to solid

Back 40

Freezing

Front 41

A liquid becoming a gas

Back 41

Vaporization

Front 42

The opposite of vaporization

Back 42

Condensation

Front 43

In the periodic table, atoms are arranged from left to right and from top to bottom in order of increasing

Back 43

Atomic number

Front 44

Group 18 elements, also known as the

Back 44

Noble gases

Front 45

The most stable elements

Back 45

Noble gases

Front 46

A column of elements in the periodic table is called a

Back 46

Group

Front 47

Elements that easily transmit electricity and heat display the property known as

Back 47

Conductivity

Front 48

Center core of an atom

Back 48

Nucleus

Front 49

A substance that will conduct electricity only under certain conditions

Back 49

Semiconductor

Front 50

No definite shape or volume

Back 50

Gas

Front 51

Vaporization that takes place only on the surface of a liquid

Back 51

Evaporation

Front 52

Particles are packed closely together, but they can move past each other freely

Back 52

Liquid

Front 53

29 cm equals how many mm?

Back 53

290 mm

Front 54

.111 kg equals how many g?

Back 54

111 g

Front 55

24 mL equals how many centiliters?

Back 55

2.4 cL

Front 56

0 kg equals how many mg?

Back 56

0 mg

Front 57

Unscramble the term

tmtrae

Back 57

Matter

Front 58

Unscramble the term

nrpoot

Back 58

Proton

Front 59

Positive particle

Back 59

Proton

Front 60

Neutral particle

Back 60

Neutron

Front 61

How many oxygen atoms are in one molecule of water?

Back 61

1

Front 62

How many atoms are in one molecule of carbon dioxide (CO2)?

Back 62

3

Front 63

How may elements make up water?

Back 63

2

Front 64

According to Charles’s law, whenever the temperature of a gas at constant pressure decreases, the volume

Back 64

Decreases

Front 65

Gas-like mixture of free electrons and atoms stripped of their electrons

Back 65

Plasma

Front 66

Physical or Chemical Change

The tarnishing of metal

Back 66

Chemical

Front 67

The most reactive group of nonmetals

Back 67

Halogens

Front 68

The most reactive group of metals

Back 68

Alkali Metals

Front 69

This group of elements gives up 2 electrons in a chemical reaction

Back 69

Alkaline earth metals

Front 70

Groups 3-12

Back 70

Transition metals

Front 71

Name the element

P

Back 71

Phosphorus

Front 72

Name the element

Ca

Back 72

Calcium

Front 73

Name the element

Li

Back 73

Lithium

Front 74

Name the element

Ne

Back 74

Neon

Front 75

Name the element

Cl

Back 75

Chlorine

Front 76

Name the element

H

Back 76

Hydrogen

Front 77

This type of bond is the attraction between oppositely charged ions

Back 77

Ionic bond

Front 78

Ionic bond or Covalent

NaCl

Back 78

Ionic

Front 79

Ionic or Covalent

Water

Back 79

Covalent

Front 80

Ionic or Covalent

Carbon Dioxide

Back 80

Covalent

Front 81

They form hard, brittle crystals with characteristic shapes

Back 81

Ionic Compound

Front 82

A chemical bond formed when two atoms share electrons is called this

Back 82

Covalent bond

Front 83

Name of the electrons involved in bonding between atoms

Back 83

Valence

Front 84

This item is written first in the chemical formula for an ionic compound

Back 84

Positive ion

Front 85

Ionic compounds are electrically this

Back 85

neutral

Front 86

The types of bonds that usually form between two nonmetals

Back 86

Covalent bonds

Front 87

How many electrons are shared inn a double covalent bond?

Back 87

4

Front 88

Halogen or Noble Gas

Bromine

Back 88

Halogen

Front 89

Halogen or Noble Gas

Iodine

Back 89

Halogen

Front 90

Halogen or Noble Gas

Argon

Back 90

Noble gas

Front 91

Halogen or Noble Gas

Florine

Back 91

Halogen

Front 92

Which atom is an alkali metal?

Calcium, Potassium, Chlorine

Back 92

Potassium

Front 93

Which atom is an alkali metal?

Mg, Li, I

Back 93

Lithium

Front 94

In an electron dot diagram of Na, how many dots should be drawn around the element's symbol?

Back 94

1

Front 95

In an electron dot diagram of Oxygen, how many dots should be drawn around the element's symbol?

Back 95

6

Front 96

In an electron dot diagram of Helium, how many dots should be drawn around the element's symbol?

Back 96

2

Front 97

In an electron dot diagram of Neon, how many dots should be drawn around the element's symbol?

Back 97

8

Front 98

In an electron dot diagram of Fluorine, how many dots should be drawn around the element's symbol?

Back 98

7

Front 99

Which group of electrons loses electrons most easily?

Back 99

Group 1

Front 100

Which group contains elements with 2 valence electrons?

Back 100

Group 2

Front 101

If an element in group one gives up an electron what is its overall charge?

Back 101

1+

Front 102

If an element gains two electrons what is its overall charge?

Back 102

2-

Front 103

Polar or Nonpolar

F2

Back 103

Nonpolar

Front 104

Polar or Nonpolar

Water

Back 104

Polar

Front 105

Molecular or Ionic Compound

Low melting points

Back 105

Molecular

Front 106

Molecular or Ionic Compound

Can conduct electricity when dissolved in water

Back 106

Ionic

Front 107

A unit of pressure is called this

Back 107

pascal

Front 108

Air pressure increases as elevation

Back 108

decreases

Front 109

Air pressure deacreases as elevation

Back 109

increases

Front 110

Water pressure decreases as depth

Back 110

decreases

Front 111

Water pressure increases as depth

Back 111

increases

Front 112

Which of the following is true of the buoyant force?

It acts in the downward direction

It acts in the upward direction

Back 112

It acts in the upward direction

Front 113

This scientific rule states that the buoyant force on an object is equal to the fluid displaced by the object.

Back 113

Archimedes' principle

Front 114

When water fills a submarine's flotation tanks, the overall density of the submarine ______

Back 114

increases

Front 115

This principle states that when force is applied to a confined fluid, the change in pressure is transmitted equally to all parts of the fluid

Back 115

Pascal's principle

Front 116

The mass per unit volume of a substance is its

Back 116

density

Front 117

Unscramble the term

yycnuoab

Back 117

buoyancy

Front 118

Unscramble the term

laapsc

Back 118

Pascal

Front 119

Unscramble the term

uldfi

Back 119

Fluid

Front 120

Unscramble the term

rai ueesrrsp

Back 120

Air pressure

Front 121

Unscramble the term

ieydstn

Back 121

Density