Which of the following is a chemical change?

A molecule is:

• the smallest particle that can exist.

• the smallest particle of an element that can exist.

• two or more atoms chemically joined together.

• the same as an atom.

When some salt is dissolved in plenty of water, which statement is most likely TRUE about the resulting solution?

• the solution becomes more concentrated the longer it is boiled.

• the boiling point decreases the longer the solution is boiled.

• the freezing point is higher than pure water.

• the boiling point is lower than pure water.

Which order of the three words matches the three substances salt, sodium, seawater ?

• compound, element, mixture

• mixture, compound, element

• element, compound, mixture

• element, mixture, compound

Which is the best way to get the salt back from some salty water?

• Sieving

• Using a magnet

• Letting the water evaporate

• Filtering

The best way to separate sand from iron filings is:

• adding water and then filtering

• using a magnet

• filtering

• sieving

Name the PROCESS you would use to obtain a sample of SOLID SALT from some sea water

• Filtration

• Electrolysis

• Evaporation

• Distillation

A boy dissolved some salt in warm water. What do we call the resulting mixture?

• a filtrate

• a solution

• a solute

• a solvent

What process would be used to obtain the solvent from a solution?

• Chromatography

• Distillation

• Filtration

• Evaporation

Which of the following would you use filtration for?

• Separating the solute from a solution

• Making a solution more concentrated

• Separating a suspension from a solution

• Separating the solvent from a solution

Put the following processes into the correct order if you wished to obtain pure salt from rock salt.

• 1. Evaporate the water 2. Dissolve the salt in water 3. Filter the solution

• 1. Dissolve the salt in water 2. Filter the solution 3. Evaporate the water

• 1. Filter the solution 2. Dissolve the salt in water 3.Evaporate the water

After filtering a mixture what do we call the liquid that drips through the filter paper?

• Distillate

• Filtrate

• Residue

Crude oil can be separated into different substances using what method of separation?

• Fractional distillation

• Chromatography

• Simple distillation

• Filtration