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year 9 Science Homework Week 2
By Naomi Arthur
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Last updated over 4 years ago
17 questions
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Question 1
1.
What is filtration used to separate?
An insoluble solid from a compound
An insoluble solid from a liquid
An soluble solid from a solution
Question 2
2.
What is crystallisation used to separate?
An insoluble solid from a mixture
An insoluble solid from a solution
An soluble solid from a liquid
Question 3
3.
What is distillation used to separate?
A liquid from a soluble solid
An insoluble solid from a solution
A liquid from a soluble sol
Question 4
4.
What is chromatography used to separate?
Dissolved substances from a compound
Dissolved substances from an element
Dissolved substances from a mixture
Question 5
5.
What is chromatography used to separate?
different coloured inks or dyes with different solvents
different coloured inks or dyes with different solubility
different coloured inks or dyes with the same solubility
Question 6
6.
Why do different inks travel different distances?
different solubilities and so move at different levels through the paper
different solubilities and so move at different times through the paper
different solubilities and so move at different speeds through the paper
Question 7
7.
A.What is the stationary phase?
Paper
Solvent
Solute
Question 8
8.
D.What is the correct equation for Rfvalue?
R_f = (time taken for substance) / (time taken for solvent)
R_f= (distance travelled by solvent) / (distance travelled by substance)
R_f= (distance travelled by substance) / (distance travelled by solvent)
Question 9
9.
Who’s atomic model described an atom as a solid sphere?
Rutherford
Thompson
Dalton
Question 10
10.
What was discovered that led Thompson to change the atomic model?
Positive protons
Neutral neutrons
Negative electrons
Question 11
11.
What does the plum-pudding model show?
Positively-charged protons embedded in a sphere of negative charge
Negatively-charged electrons embedded in a sphere of positive charge
Negatively-charged neutrons embedded in a sphere of positive charge
Question 12
12.
If the plum-pudding model was accurate what would have happened in the alpha-particle scattering experiment?
All the alpha particles should have passed directly through the gold foil
All the alpha particles should have been deflected
All the alpha particles should have been reflected straight backwards
Question 13
13.
What is the relative mass of protons and neutrons?
1
0
-1
Question 14
14.
What is the relative charge of electrons?
+1
0
-1
Question 15
15.
What is the relative charge of protons?
+1
0
-1
Question 16
16.
How many protons does oxygen have?
8
16
24
Question 17
17.
How many electrons does a boron atom have?
5
11
6