Introduction

Question 1

Atom

Answer 1

smallest part of a chemical element that can exist

Question 2

element

Answer 2

substances that can’t be split into anything simpler by chemical means. Elements are made of only one type of atom.

Question 3

molecule

Answer 3

contains at least two atoms chemically bonded to eachother

Question 4

physical change

Answer 4

creates no new substances
are usually easy to reverse
absorb or release small amounts of energy

Question 5

chemical change

Answer 5

create new substances
are usually difficult to reverse
absorb or release large amounts of energy

Question 6

mixture

Answer 6

contains two or more different substances not chemically joined together

Question 7

solute

Answer 7

a substance which is going to be dissolved

Question 8

solvent

Answer 8

the liquid which is going to do the dissolving

Question 9

solution

Answer 9

the resultant mixture of solute dissolved in solvent

Question 10

soluble

Answer 10

a substance which can be dissolved

Question 11

insoluble

Answer 11

a substance which cannot be dissolved

Question 12

suspension

Answer 12

a solid floating in liquid because it cannot dissolve

Question 13

saturation

Answer 13

a solution in which no more solute can be dissolved

Question 14

How do we measure solubility?

Answer 14

g per 100g

Question 15

properties of metals

Answer 15

malleable
electrical conductor
high density
solid at room temp

Question 16

properties of non-metals

Answer 16

malleable
insulator
low density
solid/liquid/gas at room temp

Question 17

signs of a chemical reaction

Answer 17

change of colour
bubbles
heat changes

Question 18

faster diffusion occurs when..

Answer 18

higher temperature

Question 19

iron + sulfur —>

Answer 19

iron sulfide

Question 20

diatomic elements

Answer 20

N2 O2 F2 Cl2 Br2 I2 At2