Chemistry Basics

Which of the following is an example of a Chemical Property of water?

• is transparent

• reacts with calcium

• has no odor

• boils at 100 degrees Celsius

Which of the following is an example of a physical property of hydrogen?

• reacts with oxygen

• is less dense than air

• forms hydrochloric acid

• is highly flammable

Two students mix vinegar and baking soda. They observe bubbles forming, baking soda dissolving and vinegar turning cloudy. They infer that a chemical change has occurred. Which data supports this inference?

• bubbles formed

• vinegar evaporated

• baking soda dissolved

• color of vinegar changed

The scientific discovery of the chemical and physical properties of atoms took place over several centuries. Why was it important for scientists to find out about the properties of different substances?

• So people knew how they could use the substances.

• So our understanding of time and space could be complete.

• So atoms could be seen and their parts identified.

• So that the books written about them would have complete information.

A student finds and interesting substance and test in several ways. The substance is a liquid, dark in color and does not react with baking soda or metals. The students looks on the internet to see if he can find out what it is. How is this student using the scientific method?

• he is using the internet to look up information

• he is doing an experiment with a controlled variable

• he is looking for and finding new things

• he is classifying a substance based on its characteristics

What is the atomic number of Carbon

• 14

• 6

• 12.001

• 8

What is the symbol for Gold?

• Ag

• G

• Au

• Go

What is the atomic mass of Oxygen?

• 8

• 15.999

• 16

• 3

How many Valence Electrons does Boron have?

• 3

• 5

• 6

• 1

How many electrons does Helium have?

• 2

• 8

• 4

• 6