Physical Science 20 Final Exam

When a ray of light enters a second medium at 90 degrees, the incident is called the ______

• incident angle

• critical angle

• reflected angle

• refracted angle

when a ray of light goes from one type of material into another at an angle of 0 degrees to the normal, at what angle will the light pass through the second material?

• 90 degrees

• 45 degrees

• 22.5 degrees

• 0 degrees

What is the difference in electron interaction between ionic and covalent compounds?

Ionic electrons are _____

• Shared

• Transferred

What is the difference in electron interaction between ionic and covalent compounds?

Covalent electrons are _____

• Shared

• Transferred

The formula for an acid always starts with?

• H

• OH

• Metal

• Non-Metal

The formula for a base always ends with?

• H

• OH

• Metal

• Non-Metal

Which of the following is NOT a sign that a chemical change has taken place?

• precipitate formed

• heat/light change

• change in state

• bubbles produced

Combustion reactions of a hydrocarbon always produce which product(s)?

• Oxygen

• Carbon dioxide

• water

• Both carbon dioxide & water

Endothermic

• absorbs heat

• releases heat

Exothermic

• absorbs heat

• releases heat