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WorksheetsC3 Know It
Total questions: 20
Worksheet time: 10mins
What does 'conservation' mean?
A glass room some houses have
Keeping things the same
Allowing things to change
Going from a gas to a liquid
What is the Law of Conservation of Mass in a chemical reaction?
Matter cannot be created or destroyed, so mass of reactants must equal mass of products
Matter cannot be created but it can be destroyed, so mass in a reaction can change
Matter can be created but not destroyed, so mass in a reaction can change
Matter cannot be created or destroyed, but mass in a reaction can change
What is the reason for a change in mass in a reaction?
Matter has been destroyed
New matter has been created
A gas has been used or made
A solid has melted away
How many elements are in NaCl?
1
2
3
4
How many atoms are in one molecule of NaCl?
1
2
3
4
How many atoms are in one molecule of H2O?
1
2
3
4
How many atoms are in one molecule of H2SO4?
3
5
6
7
What does the atomic number tell us about an atom?
How many electrons are in the outer shell
How many protons and neutrons it has
How many protons it has
How radioactive it is
What does the atomic mass tell us about an atom?
How many electrons are in the outer shell
How many protons and neutrons it has
How many protons it has
How radioactive it is
Hydrogen has an atomic mass of 1.
Oxygen has an atomic mass of 16.
What is the relative formula mass of H2O?
3
16
18
32
What is an isotope?
A radioactive version of an element
An element with the same atomic mass but a different number of protons
An element with the same atomic number but a different number of neutrons
A charged particle
What is 'concentration'?
The mass of a substance in a given volume
The volume of a substance per mass
The heaviness of a substance per volume
How powerful a substance is
What is concentration measured in?
mg/cm3
m/s
g/dm3
km/h
How many cm3 is in 1dm3?
10
100
1000
They are the same measurement
How many dm3 is 7000cm3?
1000dm3
1dm3
700dm3
7dm3
What is the equation for concentration?
concentration = mass ÷ volume
concentration = mass x volume
concentration = mass x force
concentration = speed ÷ time
1g of salt is dissolved in 1dm3 of water.
What is the concentration?
0.100g/dm3
1g/dm3
100g/dm3
100g/cm3
Which state of matter is the most dense?
Solid
Liquid
Gas
Which state of matter has the most energy in its particles?
Solid
Liquid
Gas
What is the state change from gas to liquid?
Evaporation
Freezing
Melting
Condensation
