Reversible and irreversible changes & Earth and space

Which of these is a reversible change?

• grilling sweetcorn

• melting ice cream

• frying an egg

• toasting bread

Which of these is a irreversible change

• water boiling

• nails rusting

• ice melting

• sugar dissolving

Maria has a mixture of sand, salt, stones and water.

She pours the mixture through filter paper.

What will be left in the fi lter paper?

• sand

• salt

• stones

• sand and stones

Ben has a beaker containing sand, salt and water. He stirs the mixture. Which of these is a solution?

• salt and sand

• salt and water

• sand and water

• water only

Bill puts a sugar cube into his mug of hot coffee. What happens to the sugar cube?

• it turns to a gas

• it joins with the coffee

• it dissolves

• it melts

Tags

NGSS.MS-PS1-4

Ben stirs some salt into water. Name the glass container Ben uses.

• spoon

• scales

• beaker

• cylinder

Describe how Ben could get solid salt back from his salt and water mixture.

• sieve the solution

• filter the solution

• evaporate the solvent

• evaporate the solute

When you mix salt and water together, what is salt in this?

• mixture

• solute

• solvent

• solution

Jose stirs some salt into a beaker of water. Which statement is correct?

• salt dissolves in water to make a solvent

• salt is the solute and water is the solvent

• water is the solute and salt is the solvent

• salt is the solute and water is the solution

Which of these could be separated by sieving?

• flour and nuts

• sand and sugar

• flour and sand

• oil and vinegar