Chemistry - Chap 5

Question 1

Alkali metals

Answer 1

Low melting point and react easily with water and air, very soft

• shiny, silvery metals
• extremely reactive
• combine easily with other elements to form compounds

Question 2

Atom

Answer 2

Smallest part of an element that has all of the elements properties

Question 3

Atomic mass

Answer 3

Average mass of an elements atoms

Question 4

Atomic number

Answer 4

Number of protons in an atom of an element

Question 5

Atomic theory

Answer 5

Study of the nature of atoms and how they combine to form all types of matter

Question 6

Group (chemical family)

Answer 6

Classification of elements with certain shared physical and chemical properties

Question 7

Halogens

Answer 7

Non-metals, very reactive and have a noticeable colour, growing in intensity

Question 8

Ion

Answer 8

Atom or group of atoms that has lost or gained electrons

Question 9

Ion charge

Answer 9

Electric charge that an atom or group of joined atoms take on when it loses or gains electrons

Question 10

Metal

Answer 10

Element that is malleable and ductile and conducts electricity and heat

Question 11

Metalloids

Answer 11

Element with metallic and non-metallic properties (silicon)

Question 12

Noble gases

Answer 12

Elements that glow if an electric current is passed through them, none of these gases are chemically reactive reactive, rarely form chemical compounds with other elements

Question 13

Non-metals

Answer 13

Elements that are grouped together mainly because they do not resemble metals (carbon)

Question 14

Nucleus (atomic)

Answer 14

Centre of the atom, contains protons and electrons

Question 15

Period

Answer 15

One of seven horizontal rows in the periodic table

Question 16

Property

Answer 16

Characteristic that describes a substance

Question 17

Pure substance

Answer 17

One kind of matter with a unique set of properties

Question 18

Relative mass

Answer 18

Mass of an object in comparison to the mass of another object

Question 19

Solution

Answer 19

Combination of pure substances in which the different substances are not individually visible (homogeneous)

Question 20

Subatomic particles

Answer 20

Particles that make up an atom (including protons, neutrons, and electrons)

Question 21

Sublimation

Answer 21

Change of state from a solid into a gas

Question 22

Suspension

Answer 22

Cloudy mixture in which tiny particles of one substance are held within another (type of heterogeneous)

Question 23

Valence electrons

Answer 23

Electron in the valence shell of an atom

Question 24

Valence shell

Answer 24

Outermost shell or energy level of an atom that has electrons in it

Question 25

Volume

Answer 25

Measure of how big an object is or how much space a fluid takes up