Unit 1

Question 0

What do compounds end in if they don’t contain water?

Answer 0

-Ide

Question 1

What do compounds end in if containing oxygen??

Answer 1

-ite OR -ate

Question 2

What’s everything in the world made from?

Answer 2

About 100 elements

Question 3

What’s a period?

Answer 3

A row of elements in the periodic table

Question 4

What’s a group?

Answer 4

A column of elements in the period table

Question 5

What are the different ways elements are classified?

Answer 5

Naturally-occurring/ made by scientist
Solid/liquid/gas
Metal/non-metal

Question 6

What are the groups in the periodic table? (3)

Answer 6

Halogens
Alkali metals
Noble gases

Question 7

What do the elements in any one group show?

Answer 7

Similar chemical properties

Question 8

What are the noble gases a family of?

Answer 8

Very unreactive elements

Question 9

What are the alkali metals a family of?

Answer 9

Very reactive metals

Question 10

What are the halogens a family of?

Answer 10

Very reactive non-metals

Question 11

Where are the transition metals found?

Answer 11

Between groups 2&3 in the periodic table

Question 12

When are compounds found?

Answer 12

When elements react together

Question 13

What do all chemical reactions involve?

Answer 13

The formation of one more new substances

Question 14

What can chemical reactions be identified from? (4)

Answer 14

Energy change
Changes in appearance of substances:
Colour change
Gas evolved 
Precipitate formed

Question 15

What do exothermic reactions do?

Answer 15

Release Energy to the surroundings and the products have a less chemical energy than the reactants

Question 16

When do mixtures occur?

Answer 16

When two or more substances come together without reacting

Question 17

What is air?

Answer 17

A mixture of gases

Question 18

What’s the test for oxygen?

Answer 18

If it delights a glowing splint

Question 19

What to endothermic reactions do?

Answer 19

Take in energy from the surroundings and the products have more chemical energy than the reactants

Question 20

What all does an atom contain?

Answer 20

A nucleus with protons and neutrons inside and electrons moving around outside the nucleus

Question 21

Why is an atom neutral?

Answer 21

Bc the protons and electrons are equal

Question 22

Approximately How heavy are protons and neutrons?

Answer 22

Mass of one atomic mass unit

Question 23

What’s the mass of an electron?

Answer 23

Virtually no mass

Question 24

How are the electrons in an atom arranged?

Answer 24

In energy levels

Question 25

Atoms of different elements have a different number of protons, what's the name for it?

Answer 25

Atomic number

Question 26

What can atoms achieve in forming bonds?

Answer 26

A stable electron arrangement

Question 27

Which bond shares pairs of electrons?

Answer 27

Covalent bonds

Question 28

What is a covalent bond a result of?

Answer 28

Two positive nuclei being held together by their common attraction for the shared pair of electrons

Question 29

What are covalent bonds?

Answer 29

Strong forces of attraction

Question 30

What bond is formed when the attraction of the atoms for the bonded electron is different?

Answer 30

Polar covalent

Question 31

Which bond is highly polar in water?

Answer 31

Covalent

Question 32

How are ionic compounds formed?

Answer 32

When metals combine with non metals

Question 33

What is ionic bonding?

Answer 33

The electrostatic force of attraction between oppositely charged ions

Question 34

What is metallic bonding?

Answer 34

The electrostatic force of attraction between positively charged ions and delocalised electrons

Question 35

What is a molecule?

Answer 35

A group of atoms held together by covalent bonds

Question 36

What's a diatomic molecule?

Answer 36

Made up of two atoms

Question 37

What are the diatomic molecules? (5)

Answer 37

``` Hydrogen Nitrogen Oxygen Carbon monoxide The halogens ```

Question 38

What can covalent substances consist of?

Answer 38

Discrete molecules

Question 39

What are the bonds between molecules weaker than?

Answer 39

The covalent bonds within molecules

Question 40

What does a covalent network consist of?

Answer 40

A giant lattice of covalent my bonded atoms

Question 41

What does a metallic structure consist of?

Answer 41

A giant lattice of positively charged ions and delocalised outer electrons

Question 42

What are all the conductors of electricity because they contain free electrons? (2)

Answer 42

``` Metal elements (solid/liquid) Carbon (graphite) ```

Question 43

What doesn't conduct electricity since they are made up of molecules which are uncharged?

Answer 43

Covalent substances (solid/liquid/solutions)

Question 44

What's an electric current?

Answer 44

A flow of charged particles

Question 45

What's electrolysis?

Answer 45

The flow of ions through a solution and molten compounds (electrolytes)

Question 46

What must be used if the products of electrolysis are to be identified?

Answer 46

d.c. Power supply

Question 47

What can the results of electrolysis experiments be illustrated by?

Answer 47

The migration of coloured ions

Question 48

What compound is usually soluble in water?

Answer 48

Ionic compounds

Question 49

What do discrete covalent substances have? (Mp/bp)

Answer 49

Low melting and boiling points

Question 50

What may covalent substances which are insoluble in water dissolve in?

Answer 50

Other solvents

Question 51

What do metals, ionic compounds and covalent network substances have? (Mp/bp)

Answer 51

High melting and boiling points

Question 52

What does electrolysis do?

Answer 52

Chemically changes the electrolyte and may lead to the break up of compound

Question 53

What conducts electricity only when dissolved in water or molten?

Answer 53

Ionic compounds