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WorksheetsQuiz on Pure and Impure Substances & Metal Reactivity
Total questions: 20
Worksheet time: 10mins
Which of the following best describes a pure substance?
A substance containing two or more types of atoms chemically bonded
A substance made of only one type of atom or compound
A mixture of different elements and compounds
A solution with dissolved particles
Which of the following is an example of an impure substance?
Distilled water
Gold
Air
Oxygen gas
Which characteristic distinguishes a pure substance from a mixture?
Pure substances have variable compositions
Mixtures have sharp melting and boiling points
Pure substances have sharp melting and boiling points
Mixtures contain only one type of atom
What is the main cause of impurities in a chemical reaction?
Excess reactants
Low temperature
Pre-existing impurities in reactants
All of the above
Which of the following is an example of a solvent?
Sugar
Water
Salt
Carbon dioxide
What is the term for the number of solute particles dissolved in a solvent?
Purity
Concentration
Dissociation
Solubility
Why does solubility increase with temperature?
Solvent particles move slower
Solid particles vibrate more and spread out
Less collisions occur
The solvent becomes denser
What is chromatography used for?
Separating metals
Determining boiling points
Identifying substances in a mixture
Changing chemical compositions
Which of the following is an application of chromatography?
Measuring air pressure
Checking food contamination
Separating oxygen from nitrogen
Filtering bacteria from water
Which of the following will show a chromatogram with multiple spots?
Pure gold
Distilled water
Ink from a marker pen
Table salt
Which statement best defines reactivity?
The ability of a metal to conduct electricity
The rate at which a substance reacts with others
The mass of a substance in a chemical reaction
The density of a metal
Which metal is the most reactive?
Gold
Silver
Potassium
Copper
What is formed when a metal reacts with oxygen?
Metal hydroxide
Metal carbonate
Metal oxide
Metal sulfate
Which of the following metals burns in oxygen with a bright flame?
Gold
Sodium
Copper
Iron
What is the general word equation for the reaction of metals with water?
Metal + Water → Metal hydroxide + Hydrogen
Metal + Water → Metal oxide + Hydrogen
Metal + Water → Metal chloride + Oxygen
Metal + Water → Metal sulfate + Carbon dioxide
Which metal reacts violently with water, producing hydrogen gas and catching fire?
Copper
Iron
Potassium
Zinc
What is the general word equation for the reaction of metals with acids?
Metal + Acid → Metal hydroxide + Oxygen
Metal + Acid → Metal chloride + Hydrogen
Metal + Acid → Metal sulfate + Water
Metal + Acid → Metal carbonate + Carbon dioxide
Why are highly reactive metals stored in oil?
To improve their conductivity
To prevent reaction with oxygen and water
To keep them clean
To increase their density
Which metal does not react with acid?
Magnesium
Zinc
Silver
Calcium
What determines the placement of metals in the reactivity series?
Atomic number
Density
Reactions with oxygen, water, and acid
Boiling points
