Jc Chemistry Simarises

Question 1

Condensation

Answer 1

Changing of a gas to a liquid

Question 2

What is an element

Answer 2

A substance cannot be Broken down into similar substances

Question 3

What Is an atom

Answer 3

The smartest part of an element

Question 4

How is a compound formed

Answer 4

When two or more elements combined together chemically

Question 5

What is a molecule

Answer 5

Smartest part of an element that can survive on its own

Question 6

What is a mixture

Answer 6

Consist of two or more different substances mingled together but not chemically combined

Question 7

What is a solution

Answer 7

A mixture of a solute and solvent

Question 8

What is a solute

Answer 8

A substance which is dissolved

Question 9

What is a solvent

Answer 9

The liquid in which the solute dissolves

Question 10

What is a saturated solute

Answer 10

One which contains as much dissolved solute as possible at a certain temp

Question 11

What is a solubility curve

Answer 11

Shows how the solubility of a substance changes with increasing temp

Question 12

What is a concentrated solution

Answer 12

Has more solute than solvent

Question 13

What method is used to separate insoluble solids from a liquids

Answer 13

Filtration

Question 14

What method is used to separate soluble solids from a solution

Answer 14

Evaporation

Question 15

What is crystallization

Answer 15

Occurs when crystals appear from a solution when evaporated

Question 16

How do we separated two liquids with different boiling points

Answer 16

Distillation

Question 17

What method is used to separate a mixture of dissolved substances in a solution

Answer 17

Chromatography

Question 18

What are compounds formed by

Answer 18

A group of atoms

Question 19

What is a chemical bond

Answer 19

Holds atoms together in a compound

Question 20

What is matter

Answer 20

Anything that has mass and takes up space

Question 21

What is the octet rule

Answer 21

States that atom bonds together so that each atom ends up with an electron arrangement with 8 electrons

Question 22

How is an ionic bond formed

Answer 22

When electrons are given/taken from an atom

Question 23

What is an ion

Answer 23

Positively/negatively charged atom or group of atoms

Question 24

When an atom looses electrons

Answer 24

It’s becomes positively changed

Question 25

When an atom gains electrons,

Answer 25

it becomes negatively charged

Question 26

What is the atomic number

Answer 26

The amount of Protons it has in the atom

Question 27

How many electrons does the first she'll holds

Answer 27

2

Question 28

What is the maximum number of electrons a shell can hold

Answer 28

8

Question 29

What is the mass number of the atom

Answer 29

The number or protons plus the number of neutrons

Question 30

WHat is the mass number of the element

Answer 30

The larger number written below the element

Question 31

What do ionic compounds consist of

Answer 31

Many appositely charged ins held together strongly to form a crystal Lattice

Question 32

How do we test for an acid

Answer 32

Turns blue litmus paper red

Question 33

How do we test for a base

Answer 33

Turns red litmus paper blue

Question 34

What is an indicator

Answer 34

A chemical which shows if something is a base or acid

Question 35

What does air consist of (elements?)

Answer 35

Nitrogen,oxygen,argon,carbon dioxide and water vapor

Question 36

Why is air a mixture

Answer 36

The composition varies from place to place and the different gases condense as liquids at different temps.

Question 37

How to test for present of water

Answer 37

Turns colbakt chloride paper from blue to pink

Question 38

What is the test for carbon dioxide

Answer 38

Limewater is turned milky

Question 39

What is the equation of carbon dioxide

Answer 39

Limewater+Carbon dioxide ---- chalk + water

Question 40

How is oxygen prepared

Answer 40

By the breakdown of hydrogen peroxide in the presence of manganese dioxide

Question 41

What is a catalyst

Answer 41

Speeds up a chemical reaction

Question 42

Test for oxygen

Answer 42

Relight a flowing splint

Question 43

Properties of oxygen

Answer 43

Colour less,tasteless,odourless and heavier than air

Question 44

What is the freezing point of water

Answer 44

0

Question 45

What is the boiling point of water

Answer 45

100

Question 46

Water treatment 5 stages include

Answer 46

Screening,settling,filtration,chlorination and fluoridation

Question 47

What is soft water

Answer 47

Water that forms a lather easily with soap

Question 48

What is hardness in water caused by

Answer 48

The presence of calcium ions dissolved in water

Question 49

How can water hardness be removed

Answer 49

Ion exchange or distillation

Question 50

WHat are the elements of water

Answer 50

Hydrogen,oxygen and electrolysis

Question 51

What are electrolysis

Answer 51

The production of a chemical reaction by electricity

Question 52

What are the ration of hydrogen and oxygen in carbon dioxide

Answer 52

2:1 (H2O)

Question 53

Properties of metals

Answer 53

Dense,hard,shiny and high melting points

Question 54

What does ductile mean

Answer 54

Able to be in thin wires

Question 55

What dies malleable mean

Answer 55

Able to be hammered into shape without breaking

Question 56

What is the corrosion of iron or steel called

Answer 56

Rusting

Question 57

What is an alloy

Answer 57

A mixture of metals

Question 58

Examples of fossil fuels

Answer 58

Coal,oil and gas