WorksheetsChemistry L 2.1, 2.2, 2.3 Revision
Total questions: 24
Worksheet time: 6hrs 0mins
Sugar and water?
homogeneous
heterogeneous
Sand and water?
homogenous
heterogenous
Sugar and sand?
homogeneous
heterogeneous
what does soluble and insoluble mean?
soluble - can be dissolved
insoluble - can’t be dissolved
banana
what method should you use to separate mixtures with a soluble solid + liquid?
evaporation
filtration
In evaporation, what happened when the mixture was heated?
All the water was evaporated and lost when heated and (substance name) was left in the beaker
banana
In filtration, what happened when the mixture was poured through filter paper? (for sugar/salt + water)
both (sugar/salt) and water will pass through the filter paper
banana
In filtration, what happened when the mixture was poured through filter paper? (For sand and water)
sand was left as RESIDUE on the filter paper and water passed through the filter paper
banana
The 2 types of matter
pure substance & mixtures
berries & cream
describe homogenous
- all components are alike
- one form/phase
- we CANNOT recognize the components
- example: solutions
A
describe heterogenous
- components are recognized
- they don’t dissolve in each other
- examples: oil + water, sand + water
S
How could you improve results of the experiment unmixing sugar and sand?
larger funnel, bigger filter paper, less amount of water
S
what is orientation?
the place in space
banana
the 3 forms of representing a substance
1) chemical equation
2) structures
3) ball-and-stick models
fancy nancy
which shows nothing? no bonds
chemical equation
CH3CH2OH
meow
which shows bonds, atoms, orientation in space?
c
ball-and-stick models
which shows bonds and atoms?
structural formula
r
what is the filtrate (liquid or solution that has passed through a filter) in the unmixing experiment
water
croissant
How to calculate atoms?
example: CH6H12O6
diagram of 15 particles
How many atoms are there in all?
1) count the number of particles = 15
2) add numbers from the chemical equation = 6 + 12 + 6 = 24
3) multiply = 15 X 24 = 360 atoms
yippee
2 particles together then separating
intermolecular force
ok
one particle breaking down - breaking a bond
intramolecular force
y
where does the word chromatography come from?
Greek - chroma means "color" and graph means "writing"
oui
what is a solvent and an example
a substance that dissolves matter - water
k
what are molecules and molecular compounds held together by?
covalent bonds
and sharing electrons
s
