Elements and Compounds

Question 1

How many elements are there?

Answer 1

118

Question 2

Define “atom”

Answer 2

Tiny particles

Question 3

What are substances made of only on TYPE of atom called?

Answer 3

Elements

Question 4

What are substances made of two or more types of atoms NOT chemically bonded together called?

Answer 4

Mixtures

Question 5

What are substances made of two or more types of atoms chemically BONDED together called?

Answer 5

Compounds

Question 6

What are reactants?

Answer 6

The chemicals that are used in a reaction

Question 7

What are the products?

Answer 7

The chemicals made in a reaction

Question 8

What is the formula for water?

Answer 8

H₂O

Question 9

What is the formula for carbon dioxide?

Answer 9

CO2

Question 10

What is the word for an element that always exists as two atoms bonded together? (extension only)

Answer 10

Diatomic

Question 11

Which elements exist diatomically?

Answer 11

Oxygen, hydrogen, nitrogen and all of group 7

Question 12

What is the symbol for “hydrogen”?

Answer 12

H

Question 13

What is the symbol of lithium

Answer 13

Li

Question 14

What is the symbol for Sodium

Answer 14

Na

Question 15

What is the symbol of helium

Answer 15

He

Question 16

What is the symbol of magnesium

Answer 16

Mg

Question 17

In everyday language what is a “pure” substance?

Answer 17

A substance that has had nothing added to it and is in its “natural” state

Question 18

What do we call a substance that doesn’t dissolve?

Answer 18

Insoluble

Question 19

What are the two stages of distillation?

Answer 19

Heat (evaporate liquid) and then cool (condense)

Question 20

What do we use to separate a solvent from solution?

Answer 20

Dilstilation

Question 21

What do we use to separate two or more coloured solutions?

Answer 21

Chromatography