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WorksheetsMock-Unit1 Test
Total questions: 26
Worksheet time: 18mins
What is the difference between an element and a compound?
Elements are pure substances and compounds are mixtures.
Compounds are pure substances and compounds are mixtures.
Elements are made of only one type of atom and compounds of two or more types of atoms chemically combined.
Compounds are made of only one type of atom and elements of two or more types of atoms chemically combined.
What happens when two different types of atoms combine chemically?
A new pure substance is produced.
A homogeneous mixture is produced.
A heterogeneous mixture is produced.
An element is produced.
Which option is true about mixtures.
They have a constant composition.
They cannot be separated into pure substances.
They have unique properties.
They are made by physical combination of pure substances.
Which substance is an element?
Helium (He)
Copper Sulphate (CuSO4)
Water (H2O)
Sodium Chlorine (NaCl)
Which substance is a compound?
Magnesium (Mg)
Hydrogen (H)
Glucose (C6H12O6)
Calcium (Ca)
Which mixture is homogeneous?
Water and oil
Alcohol and water
Water and rocks
Sand and cereal
Which mixture is heterogeneous.
Air
Alcohol and water
Gravel and sugar
Sugar and water
What type of mixture is inside the glass?
Homogeneous, because it has a constant composition.
Homogeneous, because it has a uniform appareance.
Heterogeneous, because it forms sediments.
Heterogeneous, because it has unique properties.
The tubes in the picture are made from a mixture of two metals: iron and carbon. What type of mixture is it?
Homogeneous, because it has unique properties.
Homogeneous, because it has a uniform appereance
Heterogeneous, because you can distinguish the substances in the mixture.
Heterogeneous, because the substances form substances.
Which substance is made of two types of atoms?
C6H12O6
CuO
H2SO4
He
Which molecule has in total two atoms?
H2O
CO2
N2
He
Which substance(s) is(are) an element?
Only 1
1 and 6
1, 2 and 6
1, 3, 4, 5 and 6
Which substance(s) is(are) a compound?
3, 4 and 5
2 and 7
2, 3, 4, 5 and 7
3 and 5
Which substance(s) is(are) a homogeneous mixture?
2, 4 and 7
2 and 7
2, 3, 4, 5 and 7
Only 4
Which substance(s) is(are) a heterogeneous substance?
2, 4 and 7
2 and 7
2, 3, 4, 5 and 7
Only 4
Which separation technique is shown in the picture?
Sieving
Filtration
Decantation
Evaporation
Which separation techniques works because liquids have different boiling points?
Sieving
Decantation
Evaporation
Distillation
Which technique is best (easy and fast) to separate a heterogeneous mixture of a solid with a liquid?
Sieving
Filtration
Decantation
Evaporation
Which separation technique is best (easiest and fastest) to separate a mixture of salt and water?
Sieving
Decantation
Evaporation
Distillation
Which separation technique is best (easiest and fastest) to separate a mixture of oil and water?
Filtration
Decantation
Evaporation
Distillation
Which separation technique is best (easiest and fastest) to separate a mixture of alcohol and water?
Filtration
Decantation
Evaporation
Distillation
If a heterogeneous mixture is made by substance 1 with a density of 2 mg/ml and substance 2 with a density of 1.5 mg/ml, which substance will settle on the bottom if it is separated by decantation?
Substance 1
Substance 2
You cannot use decantation to separate this substance.
It depends on the state of the substances (solid, liquid or gas)
You have a homogeneous mixture of three liquids with the following boiling points: liquid 1 (75°C), liquid 2 (50°C) and liquid 3 (92°C). Which one will be separated first if you use distillation?
Liquid 1
Liquid 2
Liquid 3
This mixture cannot be separated with distillation.
Which is the correct separation procedure to separate a mixture of: water, soil, marbles and alcohol?
Sieving, filtration and evaporation.
Sieving, filtration and decantation.
Sieving, filtration and distillation.
Filtration, decantation and distillation
Which is the correct separation procedure to separate a mixture of: Rocks, oil, alcohol and water?
Sieving, filtration and distillation.
Filtration, decantation and evaporation.
Sieving, decantation and evaporation.
Filtration, decantation and distillation.
A group of students separated a mixture of water, rocks, sand and oil using the folowing procedure: sieving, filtration and evaporation. What was their mistake?
They should have use distillation instead of evaporation.
They should have ised decantation instead of sieving.
They did not need to use filtration.
They should have use decantation instead of evaporation,
