7.2 Compounds Flashcards Preview

Year 8 Science Exam Semester 2 > 7.2 Compounds > Flashcards

Flashcards in 7.2 Compounds Deck (18):
1

What are compounds?

They are made up of more than one type of atom, every compound has a unique set of properties

2

How small are molecules in compounds?

Very small and they contain very few atoms

3

What can compound lattices form

Crystal lattices, in the lattices atoms bond very strong to each other

4

What's are the main differences between a mixture of elements or compounds?

Molecules in a mixture are not identical
No chemical formula can be written for a mixture

5

Can solids and gasses be mixed into gasses?

Yes, when small solid particles are mixed with gas, it is usually referred to as smoke/dust

6

What happens when a liquid mixes with a gas?

It is usually referred to as fog/mist

7

Can all liquids be mixed together?

No some can't

8

What is it called if something can be mixed together?

Miscible

9

What is it called if something can't be mixed together?

Immiscible

10

An gases and solids be mixed into liquids?

Yes

11

Can gases remain in the liquid?

Yes as bubbles in foam

12

What happens when solids dissolve in liquids?

They form solutions

13

What happens if a solid doesn't dissolve?

The particles become very small and the solid and liquid becomes a colloid

14

What happens if solid particles are bigger?

The mixture becomes a suspension

15

What happens in a suspension?

Particles will eventually fall to the bottom of the liquid

16

Does a colloid eventually separate out of the liquid?

No

17

What is an alloy?

A mixture of metal with other metals or non metals

18

Why are alloys important?

They are important because they have different and useful properties compared to pure metals