Q: Which is an example of a chemical reaction? OPTIONS:
- nails rusting
- glass melting
- sugar dissolving
- alcohol vaporizing
A: nails rusting

As the human population increases, more fossil fuels are being used. The burning of fossil fuels produces greenhouse gases. How might humans reduce greenhouse gases?
OPTIONS:
- Buy cars that use gasoline.
- Build power plants that use coal.
- Use renewable resources to generate power.
- Use nonrenewable resources to generate power.

Use renewable resources to generate power.

Q: Some businesses offer customers the option to pay for merchandise using their fingerprints as identification. Which of the following would most benefit customers that use this new technology? ---- OPTIONS:
- cost of product is reduced
- protection of private information
- ability to track customer preferences
- funds would be credited immediately

A: protection of private information

Which of the following is a characteristic of all chemical changes?
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OPTIONS:
- A different state of matter is produced.
- Some mass is converted to energy.
- Some form of light is given off.
- A new material is formed.

A new material is formed.

Question:
Heat from deep in Earth's interior is transferred to its crust by which of the following?
OPTIONS:
- conduction in the ocean
- convection in the mantle
- radiation from the solid core
- evaporation at mid-ocean ridges
Answer:
convection in the mantle

Question:
Which class of elements best conducts electricity?
OPTIONS:
- metals
- nonmetals
- semimetals
- noble (inert) gases
Answer:
metals