Separating Mixtures
What is a way to separate a mixture of solids?
sieves, wind, buoyancy, magnets
What is a solution?
A mixture where the solute is dissolved into a solvent
What change is ice melting into water an example of?
A physical change or reversible change
What is a solute?
The substance that is being dissolved
Is a mixture of salt and water a solution or suspension?
Solution
How can you separate nails from gumballs?
Using a magnet
Is a mixture of lemon juice and water a solution?
yes
Is adding blue food colouring to water so it turns blue and example of a reversible or irreversible change?
Reversible because you can separate the food colouring because the new colour is not a new product.
What is a solvent?
The substance doing the dissolving
Is a mixture of oil and water a solution or suspension?
Suspension
Explain decanting
A separation technique where part of the mixture is poured out and the other part remains in the original container.
Is cold water or hot water better for dissolving solutes?
hot water
Is Diet Coke and Mentos and example of a chemical change?
Yes, because there are bubbles/foam is formed
What is the definition of dissolving?
A process where the particles of one substance become completely intermingled with another substance and remain that way indefinitely
Is a mixture of cornstarch and water a solution or suspension?
Suspension
If you have a solution of sugar and water, how can you separate the dissolved sugar form the water?
By using evaporation.
What makes carbon dioxide?
Vinegar and baking soda
Melting ice cream is an example of a chemical or physical change?
Physical, because a new substance has not been created
What does a suspension look like?
A suspension will look cloudy because the solid has not completely dissolved in the water. Very small particles of a solid will remain suspended without dissolving.
Is a mixture of kool-aid and water a solution or suspension?
Solution
Give three means of recovering a substance from a suspension
Decanting, Filtering, Buoyancy
Give three means of recovering a substance from a solution
Evaporation, Distillation, Crystallization
How do you know when a chemical reaction has occurred?
There is an irreversible change
A new substance has been created
What is a chemical reaction?
A reaction between two substances that creates a new substance.
Is a mixture of hot chocolate mix and hot water a solution or suspension?
Solution