Matt, erin, and lauren were having a challenge to see who could dissolve a one-pound cube of sugar the quickest. matt puts his sugar cube in a bucket of water and stirs it with a wooden spoon. erin heats up the water before putting it into her bucket and uses a wood spoon to stir it. what must lauren do to make her sugar cube dissolve quicker than matt and erin?

Generally speaking, there are three factors that affect how fast a solid dissolves in a liquid:

Matt uses the first one, while Erin uses the first two. In order to win, Lauren has to use all three, that is: Heat up the water, stirr it with a wooden spoon, and break up the cube of sugar into smaller portions (or a fine dust).

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e