Elements Compounds & Mixtures

Question 1

What is an element?

Answer 1

Pure substance that cannot be broken into simplest substances via chemical processes

Question 2

Elements can be classified into

Answer 2

metal, non metallic properties

Physical state at room temperature

Question 3

What is an atom?

Answer 3

The smallest particles that has the property of the element

Question 4

What are noble gases that exist as individual atom called?

Answer 4

Monatomic elements

Question 5

What is molecules?

Answer 5

Two or more atom chmeically combined together

Question 6

What is a polyatomic molecule?

Answer 6

Three or more atom chemically combined together

Question 7

Give 3 reasons why pure copper is a good choice for making wire?

Answer 7

Ductility
Malleability
Good electrical conductivity

Question 8

What elements has a high melting point 120 degree Celsius and is a non conductor of electricity

Answer 8

oxygen
bromine
carbon

Question 9

What is a compound?

Answer 9

Pure substances that contain 2 or more elements that are chemically bond together

Question 10

Composition of compound is made up of?

Answer 10

Molecules

Ion

Question 11

Magnesium + oxygen =

Answer 11

Magnesium oxide

Question 12

What is the ratio of hydrogen to oxygen in water

Answer 12

hydrogen : oxygen = 2 : 1

Question 13

What is the ratio of Hydrogen Chloride?

Answer 13

H :Cl

1 : 1

Question 14

What is the ratio of Carbon Dioxide?

Answer 14

C : O

1 : 2

Question 15

What is the ratio of Carbon Monoxide?

Answer 15

C : O

1 : 1

Question 16

What is the ratio of Sulfuric Acid?

Answer 16

H : S : O

2 : 1 : 4

Question 17

What is the ratio of ethanol?

Answer 17

C : H : O

2 : 6 : 1

Question 18

Decomposition of compounds can be done via

Answer 18

Electrolysis

Thermal decomposition

Question 19

What is a mixture?

Answer 19

A mixture is made up of 2 or more substances that are not chemically combined

Question 20

What is the difference between compound and mixture in terms of separation?

Answer 20

Compound - only via chemical

Mixture - physical

Question 21

What is the difference between compound and mixture in terms of properties?

Answer 21

Compound - different

Mixture -has the properties of substances

Question 22

What is the difference between compound and mixture in terms of energy/change?

Answer 22

Compound - heat/light given in/out

Mixture - NA

Question 23

What is the difference between compound and mixture in terms of composition?

Answer 23

Compound - fixed proportion

Mixture - not fixed

Question 24

What is the appearance of Aluminium?

Answer 24

silvery solid

Question 25

What is the appearance of Copper?

Answer 25

Reddish brown solid

Question 26

What is the appearance of Iron?

Answer 26

Grey solid

Question 27

What is the appearance of Magnesium?

Answer 27

Silvery solid

Question 28

What is the appearance of Mercury?

Answer 28

Silvery liquid

Question 29

What is the appearance of Zinc?

Answer 29

Greyish solid

Question 30

What is the appearance of Carbon?

Answer 30

Black solid

Question 31

What is the appearance of Hydrogen?

Answer 31

Colourless Gas

Question 32

What is the appearance of Iodine?

Answer 32

Black solid

Question 33

What is the appearance of Nitrogen?

Answer 33

Colorless Gas

Question 34

What is the appearance of Oxygen

Answer 34

Colorless Gas

Question 35

What is the appearance of Sulphur?

Answer 35

Yellow solid

Question 36

What is the common usage of Copper?

Answer 36

Waterpipes | brass

Question 37

What is the common usage of Aluminium?

Answer 37

Aircraft construction cans

Question 38

What is the common usage of Iron?

Answer 38

Steel | construction work

Question 39

What is the common usage of Magnesium?

Answer 39

firework | medicine

Question 40

What is the common usage of Mercury?

Answer 40

Amalgam filling | thermometer

Question 41

What is the common usage of zinc?

Answer 41

casings | dry celss

Question 42

What is the common usage of carbon?

Answer 42

Charcoal lead diamond

Question 43

What is the common usage of Hydrogen?

Answer 43

Balloon | Rocket fuel

Question 44

What is the common usage of Iodine?

Answer 44

Antiseptic | medicine

Question 45

What is the common usage of Nitrogen?

Answer 45

fertilizers | freezing frozen food

Question 46

What is the common usage of Oxygen?

Answer 46

oxygen tank

Question 47

What is the common usage of Sulphur?

Answer 47

Insecticide | drugs

Question 48

Compounds can be formed via

Answer 48

Combustion Reaction of element with other compound Reaction of compound with other compound Decomposition of compound

Question 49

What are the types of compound

Answer 49

Covalent | ionic

Question 50

What is the difference in covalent and ionic compounds?

Answer 50

Colvalent particles share the same electron | Ionic is strong electrostatic particles