Chapter 1: Matter, Energy, Measurement

Question 1

What is Chemistry?

Answer 1

is the science that deals with matter: the structure and properties of matter and the transformations

Question 2

What is Matter?

Answer 2

Anything that takes up space (volume). Matter cannot be created or destroyed, but can undergo Chemical Change.

Question 3

What is Chemical Change?

Answer 3

more commonly called a chemical reaction, substances are used up (disappear) and others are formed to take their places. An example is the burning of the mixture of hydrocarbons usually called “bottled gas.” In this mixture of hydrocarbons, the main component is propane. When this chemical change takes place, propane and oxygen from the air are converted to carbon dioxide and water.

Question 4

What is a Physical Change?

Answer 4

These changes differ from chemical reactions in that the identities of the substances do not change. Most physical changes involve changes of state— for example, the melting of solids and the boiling of liquids. Water remains water whether it is in the liquid state or in the form of ice or steam. The conversion from one state to another is a physical—not a chemical—change. Another important type of physical change involves making or separating mixtures. Dissolving sugar in water is a physical change.