Topic 2 Physical and Chemical Changes

A part or ingredient in something

A mixture in which one or more substances dissolve in another

Trail mix is a great example of this, because you can see and separate the different components.

This kind of change produces a new type of matter different from its components.

A student measures the amount of matter for a beaker of water and an antacid tablet before it dissolves (trial 1) and gets 51.05g. Then, 30 minutes later, they measure the amount of matter in the beaker after the tablet has dissolved. (Trial 2). Which end amount of matter measurement for trial 2 would be correct?

• 51.05 g, the total amount of matter is conserved even though the tablet dissolved.

• 50 g, the amount of matter for the tablet vanishes when it dissolves in the water.

• 100 g, because the amount of matter for the tablet changed the amount of matter for the water.

A scientist performs an experiment and mixes sugar and water in a beaker. The sugar dissolves in the water. The amount of matter for the water is 100 g. The amount of matter for the sugar s 150 g. What is the total amount of matter for the sugar and water mixture after the sugar dissolves?

• 150 g

• 250 g

• 50 g

• 100 g