Log in
Sign up for FREE
arrow_back
Library
year 9 Science Homework Week 2
By Naomi Arthur
star
star
star
star
star
Share
share
Last updated over 4 years ago
17 questions
Add this activity
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Question 1
1.
Question 2
2.
Question 3
3.
Question 4
4.
Question 5
5.
Question 6
6.
Question 7
7.
Question 8
8.
Question 9
9.
Question 10
10.
Question 11
11.
Question 12
12.
Question 13
13.
Question 14
14.
Question 15
15.
Question 16
16.
Question 17
17.
What is filtration used to separate?
An insoluble solid from a compound
An insoluble solid from a liquid
An soluble solid from a solution
What is crystallisation used to separate?
An insoluble solid from a mixture
An insoluble solid from a solution
An soluble solid from a liquid
What is distillation used to separate?
A liquid from a soluble solid
An insoluble solid from a solution
A liquid from a soluble sol
What is chromatography used to separate?
Dissolved substances from a compound
Dissolved substances from an element
Dissolved substances from a mixture
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
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
A.What is the stationary phase?
Paper
Solvent
Solute
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)
Who’s atomic model described an atom as a solid sphere?
Rutherford
Thompson
Dalton
What was discovered that led Thompson to change the atomic model?
Positive protons
Neutral neutrons
Negative electrons
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
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
What is the relative mass of protons and neutrons?
1
0
-1
What is the relative charge of electrons?
+1
0
-1
What is the relative charge of protons?
+1
0
-1
How many protons does oxygen have?
8
16
24
How many electrons does a boron atom have?
5
11
6