Elements Compounds & Mixtures Flashcards Preview

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Flashcards in Elements Compounds & Mixtures Deck (50)
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1

What is an element?

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

2

Elements can be classified into

metal, non metallic properties
Physical state at room temperature

3

What is an atom?

The smallest particles that has the property of the element

4

What are noble gases that exist as individual atom called?

Monatomic elements

5

What is molecules?

Two or more atom chmeically combined together

6

What is a polyatomic molecule?

Three or more atom chemically combined together

7

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

Ductility
Malleability
Good electrical conductivity

8

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

oxygen
bromine
carbon

9

What is a compound?

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

10

Composition of compound is made up of?

Molecules
Ion

11

Magnesium + oxygen =

Magnesium oxide

12

What is the ratio of hydrogen to oxygen in water

hydrogen : oxygen = 2 : 1

13

What is the ratio of Hydrogen Chloride?

H :Cl
1 : 1

14

What is the ratio of Carbon Dioxide?

C : O
1 : 2

15

What is the ratio of Carbon Monoxide?

C : O
1 : 1

16

What is the ratio of Sulfuric Acid?

H : S : O
2 : 1 : 4

17

What is the ratio of ethanol?

C : H : O
2 : 6 : 1

18

Decomposition of compounds can be done via

Electrolysis
Thermal decomposition

19

What is a mixture?

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

20

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

Compound - only via chemical
Mixture - physical

21

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

Compound - different
Mixture -has the properties of substances

22

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

Compound - heat/light given in/out
Mixture - NA

23

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

Compound - fixed proportion
Mixture - not fixed

24

What is the appearance of Aluminium?

silvery solid

25

What is the appearance of Copper?

Reddish brown solid

26

What is the appearance of Iron?

Grey solid

27

What is the appearance of Magnesium?

Silvery solid

28

What is the appearance of Mercury?

Silvery liquid

29

What is the appearance of Zinc?

Greyish solid

30

What is the appearance of Carbon?

Black solid