Materials

Question 1

Atomic mass

Answer 1

Number of protons + neutrons

Neutrons = atomic mass - atomic number

Question 2

Electrons

Answer 2

• charge , no mass, out side shells 2,8,8

Question 3

Protons

Answer 3

+ charge, mass of 1 , found in nucleus

Ie. If have an atomic number of 6 = a mass of 6

Question 4

Neutron

Answer 4

No charge, found in nucleus, mass of 1

Question 5

h20

Answer 5

Hydrogen oxide, water

Question 6

C02

Answer 6

Carbon dioxide

Question 7

Nh3

Answer 7

Ammonia

Question 8

Compound

Answer 8

2 or more elements

Question 9

Properties of metals

Answer 9

• high density
• strong
• electrical conductors
• thermal conductors
• malleable e.g squish cans
• solid at room temperature

Question 10

Properties of non metals

Answer 10

• poor conductors of electricity and heat
• dull , don’t shine
• low melting points
• low density

Question 11

Pure metal (base metals)

Answer 11

Made from one element e.g silver

Question 12

Metallic bonding e.

Answer 12

Physical not chemical bond

Question 13

Alloy

Answer 13

Mixture of two elements
E.g instead of steel, stainless steel

• better
• improved

Question 14

Common alloys

Answer 14

Bronze = good conductor, low friction - wires

Brass = highly workable, durable, low friction Instruments

Coin metal = highly workable - coins

Question 15

Ores

Answer 15

A rock that contains elements that can be extracted

Question 16

Common ores

Answer 16

Iron ore - extracted from the hematitive + magnetite

Magnestite - magnesium oxide + carbonate

Question 17

Demoncritus

Answer 17

Indivisible particles

Question 18

Thomson

Answer 18

Plumb pudding model

Positively charges spheres with electrons embedded in them

Question 19

Bohr

Answer 19

Shell model

Same as Rutherford but electrons orbiting in energy levels

Question 20

Rutherford

Answer 20

Solar system model

Atom is empty space with positively charged nucleus and electrons orbiting the nucleus

Question 21

Chadwick

Answer 21

Shell model

Electrons orbit nucleus, which is neutral containing protons and neutrons

Question 22

Properties of acids

Answer 22

• have hydrogen irons h+
• are chorosive ( burns )
• are sour
• conduct electricity

Question 23

Properties of alkali or bases

Answer 23

- have hydroxide irons   Oh-
( poly atomic iron - more than one element)
- are caustic 
- are bitter
- conduct electricity

Question 24

Ph

Answer 24

Ph is a measure of acidity and alkalinity

Question 25

Neutralisation

Answer 25

Occurs when you mis acid and alkali

7 is neutral

Acid+ base —> salt + water

Question 26

Atomic number

Answer 26

Top one

Number of protons( equal to electrons if neutral)