What change is ice melting into water an example of?
A physical change
Is adding blue food colouring to water so it turns blue and example of a reversible or irreversible change?
Physical because you can separate the food colouring because the new colour is not a new product.
When separating mixtures, are all ways equally as effective?
No; Some methods are better than others.
Is Diet Coke and Mentos and example of a chemical change?
Yes, because there are bubbles formed
What are some ways you can tell liquids apart? Name at least 2.
colour, odour, surface tension, and density.
Marbles in a bag of sand is an example of a _________ (homogeneous/heterogeneous) mixture?
Heterogeneous mixture.
How do you know a chemical change has happened?
There is a new substance formed, there is a colour change, there are bubbles or energy is released.
What is surface tension?
The top layer of atoms in a liquid which stick together to form 'beads'.
Is salad dressing a solution?
A gas fireplace is turned on and then turned off. Is this an example of an irreversible or reversible change?
A chemical change because there is a change in colour and energy is released.