Q: Which is a chemical change? OPTIONS:
- Element 1 is hammered into a thin sheet.
- Element 2 is heated and turns into a liquid.
- Element 3 turns a greenish color as it sits in air.
- Element 4 is ground up into a fine, slippery powder.
A: Element 3 turns a greenish color as it sits in air.

Lemon juice turns litmus paper red, is corrosive and tastes sour. Lemon juice is classified as
OPTIONS:
- an acid.
- a base.
- an element.
- More information is needed to classify lemon juice.

an acid.

Q: Which scientific model could be used to predict the properties of an element? ---- OPTIONS:
- closed loop system
- Punnett square
- Periodic Table
- water cycle chart

A: Periodic Table

What is a galaxy?
===
OPTIONS:
- a moon that orbits a planet
- a planet that orbits the Sun
- a very large system of stars that is held together by gravity
- a very large system of planets that is held together by the Sun

a very large system of stars that is held together by gravity

Question:
A scientist combines oxygen and hydrogen to form water. This combination illustrates that water is
OPTIONS:
- an atom.
- an element.
- a mixture.
- a compound.
Answer:
a compound.

[Q]: Several interchangeable parts are used in the manufacture of automobiles. Some examples of these parts are batteries, windshield wiper blades, spark plugs, and tires. Which of the following is an advantage of interchangeable parts over non-interchangeable parts on automobiles?
===
OPTIONS:
- Interchangeable parts are generally more expensive than custom-made parts for automobiles.
- Interchangeable parts break more often now than in years past on most automobiles.
- Interchangeable parts are plentiful for custom-made automobiles.
- Interchangeable parts can fit many kinds of automobiles.
****
[A]:
Interchangeable parts can fit many kinds of automobiles.