Q: Sound will not travel in a OPTIONS:
- solid
- liquid
- gas
- vacuum
A: vacuum

A boy pulls a sweater off over his head. His hair is attracted to the sweater due to
OPTIONS:
- a magnetic force
- a heat transfer
- a chemical change
- an electrical charge

an electrical charge

Q: Which is the best example of a pure substance? ---- OPTIONS:
- peanuts
- milk
- gold
- air

A: gold

Which of the following changes occurs as a solid is heated?
===
OPTIONS:
- The kinetic energy of the solid decreases.
- The average density of the solid increases.
- The specific heat capacity of the solid decreases.
- The average molecular speed in the solid increases.

The average molecular speed in the solid increases.

Question:
Use The Periodic Table of the Elements and the information below to answer the question. Magnesium metal (Mg) is grayish-white in color and reacts actively with water. Fluorine (F2) is a greenish-yellow gas at room temperature and is a member of the halogen family. These two elements react to produce magnesium fluoride (MgF2), a chemical commonly used in making windows and lenses. How do the elements magnesium (Mg) and fluorine (F2) produce the compound magnesium fluoride (MgF2)?
OPTIONS:
- by nuclear connection
- by physically combining
- by magnetic connection
- by chemically combining
Answer:
by chemically combining

Q: Which of the following organisms produces energy from sunlight? OPTIONS:
- worm
- rabbit
- hawk
- grass
A:
grass