CHAPTER 3 SCIENCE Flashcards
(13 cards)
1
Q
what is a compound
A
- pure substance made out of two or more elements which are chemically combined
- cannot be broken down using physical methods
2
Q
what is an element
A
- it can be found in the periodic table
- they are basic building blocks for living and non living matter
- cannot be decomposed or broken down into simpler substances
3
Q
what are mixtures
A
- substances made out of two or more elements or compounds which are physically combined together
- not a pure substance
4
Q
what are alloys
A
- alloys are mixtures of metals with another element (can be non metal or metal)
- examples: brass, Bronze, steel, pewter
5
Q
what is a soultion
A
when a solute is dissolved by a solvent into a mixture
6
Q
what is a suspension
A
when a insoluble solute is mixed in a solvent
7
Q
what is solubility
A
solubility is the how much of solute that can be dissolved in a unit/volume solvent
8
Q
factors affecting rate of dissolving
A
- temperature increases ( rate increases)
- stirring increases( rate increases)
- surface area decrease (rate of dissolving increases)
9
Q
what are the seperation techniques
A
- magnetic attraction
- filtration
- evaporation
- simple distillation
- paper chromatography
10
Q
what is magnetic attraction used to seperate
A
- it is used to seperate magnetic substances with non magnetic substances
11
Q
explain filtration
A
- filtration is used to seperate insoluble solids with liquid mixture
- filtrate is the solvent and residue is the insoluble soild
12
Q
explain evaportation
A
- evaporation is to seperate solute from solvent
- the solvent will change state from liquid to gas at a much lower temperature, leaving the solute.
13
Q
simple distillation
A
- to seperate substances with different boiling points
1. the solution in the flask is heated until it boils.
2. water changes into steam which passes through the condenser
3. steam pass
