Science Trimester 3 Exam

Question 1

Matter

Answer 1

Anything that has mass and takes up space

Question 2

Atom

Answer 2

A small particle that is a building block of matter

Question 3

What subatomic particles are located in the nucleus of an atom?

Answer 3

Protons and Neutrons

Question 4

Substance

Answer 4

Matter which has a specific composition or specific properties

Question 5

Element

Answer 5

A substance that consists of just one type of atom

Question 6

What does the atomic number of an element represent?

Answer 6

Number of protons in the atom

Question 7

Compound

Answer 7

A type of substance containing atoms of two or more different elements chemically bonded together

Question 8

What do periods on the periodic table indicate?

Answer 8

The number of shells that exist around the nucleus

Question 9

What orientation are periods on the periodic table?

Answer 9

Horizontal

Question 10

What do groups on the periodic table indicate?

Answer 10

The number of valence electrons

Question 11

What orientation are groups on the periodic table?

Answer 11

Vertical

Question 12

Where are electrons found?

Answer 12

Outside the nucleus

Question 13

Valence electrons

Answer 13

The outermost electrons of an atom that participates in chemical bonding

Question 14

Valence shell

Answer 14

The outermost shells of an atom

Question 15

Chemical bond

Answer 15

A force that holds two or more atoms together in a compound

Question 16

Subatomic particles

Answer 16

Electrons, protons, and neutrons

Question 17

Covalent bond

Answer 17

A chemical bond formed when two atoms share one or more pairs of valence electrons

Question 18

What family of elements form covalent bonds?

Answer 18

Non-metals

Question 19

Double covalent bonds

Answer 19

Two atoms share two pairs of valence electrons

Question 20

Molecule

Answer 20

A group of atoms held together by covalent bonding that acts as an independent unit

Question 21

Polar molecule

Answer 21

A molecule in which one end of the molecule is slightly positive, while the other end is slightly negative

Question 22

Chemical formula

Answer 22

A group of chemical symbols and number that represent the elements and the number of atoms of each element that make up a compound

Question 23

Ion

Answer 23

An atom or group of atoms that carries a positive or negative electric charges as a result of having lost or gained one electron

Question 24

How does an ion differ from a neutral atom?

Answer 24

It has lost or gained electrons

Question 25

If an atom lose an electron what will its charge be?

Answer 25

Positive because it will have more protons than electrons

Question 26

If an atom gains an electron what will its charge be?

Answer 26

Negative because it will have more electrons than protons

Question 27

Ionic bond

Answer 27

The attraction between positively and negatively charged ions in an ionic compound

Question 28

What families form ionic bonds?

Answer 28

Non-metals and metals