Separating Mixtures
What are the 4 ways to separate solids?
sieves, air, water, magnets
What is a solution?
A mixture where the solute is dissolved into a solvent.
What is required for a chemical reaction?
2 reacting ingredients.
What is a solid?
A state of matter which has definite shape and volume.
What is the name of the tool used to measure acidity?
A ph scale.
How might you separate nails from gumballs?
Using a magnet.
Is a mixture of lemon juice and water a solution?
Yes
How do you know when a chemical reaction has occurred?
Colour change, bubbling, odor, heat.
What is a gas?
A state of matter that takes the shape of its container. It will expand or contract with changes in temperature and pressure.
A liquid changes the cabbage indicator pink. Is it an acid, a base or neutral?
It is an acid.
Explain filtration.
A separation technique where the mixture is poured through a filter. The liquid separates into a container under the filter while the solids are left stuck in the filter.
If liquids layer, where will the most dense liquids be?
On the bottom.
What is ice melting into water an example of?
A reversible change.
What is a solute?
The substance that is dissolved in a solution.
A liquid changes the cabbage indicator blue. Is it an acid, a base or neutral?
It is a base.
If you have a solution of sugar and water, how can you separate the dissolved sugar from the water?
By using evaporation.
What makes carbon dioxide?
Vinegar and baking soda
What is adding Mentos to Diet Coke an example of?
A chemical reaction because the combination bubbles.
What is a solvent?
The substance that does the dissolving.
What number represents neutral on the ph scale?
7
How would you separate wood shavings, large rocks and staples?
You could use a magnet to separate the staples and wind or water to separate the rocks and wood shavings.
Is salad dressing a solution?
No
When adding blue food colouring to water, what is this?
Reversible change because the food colouring is merely a dye, not a new product.
What is surface tension?
The surface film of a liquid caused by the attraction of its molecules.
What is the most acidic item represented on the ph scale?
Battery acid.