Cp

Question 1

What is a pure substance

Answer 1

A substance that consists of only one element or compound

Question 2

What is a mixture

Answer 2

A mixture consists of two or more substances that are not chemically joined together

Question 3

What happens when a mixture is heated in simple distillation

Answer 3

The solvent evaporates and leaves the solution

Question 4

What method is used to obtain pure water from salt solution

Answer 4

Simple distillation is used to obtain or pure water

Question 5

In chromatography what is a mobile phase

Answer 5

The solvent that moves through the paper

Question 6

What substance can be separated from its mixture with water by fractional distillation

Answer 6

Ethanol

Question 7

What is a compound

Answer 7

A substance made up of two or more elements that are chemically combined

Question 8

What’s the plum pudding model

Answer 8

An atom is a ball of positive charged with negative electrons in embedded in it

Question 9

What’s the typical radius of an atom

Answer 9

One times 10 to the power of 10 m

Question 10

What is the relative mass and charge of a neutron

Answer 10

Mass one and charge Zero

Question 11

What are isotopes

Answer 11

Atoms of the same element with different numbers of neutrons

Question 12

What is relative atomic mass of an element

Answer 12

The average mass of the atoms of an element compared to 1/12 of the mass of a carbon -12 atom

Question 13

Why is loft insulation so effective

Answer 13

Because it traps air trapped air is a very good insulator

Question 14

What is the best material to wrap around a mug to keep the drink water as long as possible

Answer 14

Bubble wrap

Question 15

What happens to the molecules in a liquid as it gets hotter

Answer 15

They will speed up

Question 16

What happens to the molecules in a solid as it gets hotter

Answer 16

They vibrate faster

Question 17

How do metal atoms form ions

Answer 17

They lose electrons to form positive ions

Question 18

What does negative ions have

Answer 18

More electrons than protons

Question 19

What forces hold an ionic lattice together

Answer 19

Electrostatic forces

Question 20

What properties does an ionic compound have

Answer 20

High melting point and it conducts electricity when liquid

Question 21

What is a covalent bond

Answer 21

A bond formed when two atoms share pairs of electrons

Question 22

What is the greatest number of covalent bonds that are carbon atom can form

Answer 22

For

Question 23

How many electrons can share in a double bond

Answer 23

Four electrons

Question 24

When a substance made of small molecules boils what does the energy overcome

Answer 24

It overcomes inter-molecular forces. The strong con spent bonds are not broken

Question 25

Why do substances made of small molecules not conduct electricity

Answer 25

Because they have no charge particles that are free to move from place to place

Question 26

What is a triple bond

Answer 26

Three pairs of electrons are shared between two atoms

Question 27

What substance has a giant Covalent structure

Answer 27

Silicone dioxide

Question 28

What type of bond joins the atoms together in a Polymer molecule

Answer 28

Covalent bonds

Question 29

Why does diamond have a high melting

Answer 29

Because of the large amounts of energy that is needed to break it strong covalent bonds

Question 30

How are particles bonded together in metals

Answer 30

Attractive forces between atoms and delocalised electrons

Question 31

Why are electrons in the outer shell of metal atoms free to move through the whole structure

Answer 31

They are delocalised electrons

Question 32

Which part of metal is most important in transferring thermal energy

Answer 32

Delocalised electrons

Question 33

How are atoms arranged in metals

Answer 33

Layers

Question 34

How do metals have high melting points

Answer 34

They have strong metallic bonds

Question 35

Why can metals be bent and shaped

Answer 35

The atoms are arranged in layers which slide over each other

Question 36

What is the main energy transfer for an apple falling from a tree

Answer 36

Gravitational potential to kinetic energy

Question 37

What is the main energy transfer for long distance runner

Answer 37

Chemical energy into kinetic energy

Question 38

What happens to dissipated energy

Answer 38

It’s lost in the surroundings