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WorksheetsHomework 1
Total questions: 25
Worksheet time: 28mins
Why was the gold leaf important in the alpha scattering experiment?
Gold can be hammered into incredibly thin sheets.
Gold has no nucleus.
Alpha particles can be stopped by air.
Why was the vacuum important in the alpha scattering experiment?
Alpha particles are positive.
Alpha particles can be stopped by air.
Alpha particles cannot be stopped by air.
4.After the alpha scattering experiment, the scientists concluded that:
most of the atoms must have a very small nucleus, why?
Some of the particles deflected.
a). Only a very small number of particles rebounded completely.
Some of the particles deflected
After the alpha scattering experiment, the scientists concluded that:
the nucleus must be positively charged, why?
Some of the particles went straight through.
Some particles were deflected.
Some of the particles rebounded
After the alpha scattering experiment, the scientists concluded that: most of the atom is an empty space , why?
Some of the particles deflected.
Some of the particles rebounded
Most particles went through the atoms in the gold leaf.
Describe one reason the nuclear model first developed was different to: The plum pudding model
The nuclear lacks energy levels.
The nuclear model included a negative proton.
The nuclear model included a nucleus.
Describe one reason the nuclear model first developed was different to, the nuclear model as we know it today.
a)The nuclear model today includes protons, neutrons in energy levels.
a)The nuclear model today includes protons, neutrons and electrons in energy levels.
a)The nuclear model today includes neutrons and electrons in energy levels.
Describe Democritus’ beliefs about atoms
Everything was made of atoms, and
(particles) which were indivisible (cannot be divided).
Everything was made of atoms with
several sub structures
Everything was made of protons.
Why was the alpha-scattering experiment accepted by scientists?
Because Three scientist conducted the experiment.
It was not reproducible – other scientists were not able to repeat it and get the same results.
It was reproducible – other scientists were able to repeat it and get the same results.
What is the charge of alpha particles?
positive
negative
neutral
Which of the following is MOST reactive?
Magnesium
Lead
Tin
Copper
Zinc
Which metal is more reactive than calcium?
magnesium
potassium
silver
aluminum
Choose the least reactive metal
calcium
magnesium
iron
copper
Choose the most reactive metal
calcium
magnesium
iron
copper
Which are the signs of chemical change?
Change in size
Colour change
Precipication
Change in state
Effervescence / Gas produced
What does displacement mean?
A chemical reaction where a less reactive metal takes the place of a more reactive metal in a compound.
A chemical reaction where a more reactive metal takes the place of a less reactive metal in a compound.
A more reactive metal is removed from a compound.
Magnesium chloride + Sodium → ?
Sodium chloride + Magnesium
Magnesium chloride + Sodium (No change)
Sodium magnesium + Chlorine
Zinc sulphate + Magnesium → ?
Magnesium + Sulphur + Hydrogen
Zinc sulphate + Magnesium
Magnesium sulphate + Zinc
Lithium chloride + Iron → ?
Lithium chloride + Iron (No change)
Iron chloride + Lithium
Lithium oxide + hydrogen
Which is least reactive?
gold
Calcium
Magnesium
Which can displace Calcium from calcium sulphate?
Sodium
Copper
Iron nails + copper oxide → ?
Iron nails + copper oxide
Iron oxide + copper oxide
Iron oxide + copper
Magic
