Answers to the 8th Grade Science Quiz

Posted: April 25, 2015 in Articles
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Here are the answers to the science quiz we posted on Wednesday. This article has the questions, in case you didn’t see them.

1. Define atom. The smallest stable unit of matter in creation.

2. Define molecule. Two or more atoms linked together to make a substance with unique properties.

3. Fifty grams of a carbon disulfide can be broken down into 42.1 grams of sulfur and 7.9 grams of carbon. Is carbon disulfide made up of atoms or molecules? Carbon disulfide is a molecule

4. If you put iron near a magnet, the iron will be attracted to the magnet. Rust is made up of molecules which contain iron atoms, oxygen atoms, and hyrdrogen atoms. Rust is not attracted to a magnet. If rust contains iron atoms, and iron is attracted to a magnet, why isn’t rust attracted to a magnet? Because when an atom is a part of a molecule, the molecule doesn’t pick up every characteristic of the atoms. The atoms join together to make a new substance with unique qualities.

5. A statue is made out of copper and displayed outside. After many years, what color will the statue be? It will turn green over time.

6. Have scientists actually seen atoms? No, they have not.

7. Give the numerical meaning for the prefixes centi, milli, and kilo. Kilo means 1,000, centi means .01, and milli means .001.

8. If you wanted to measure an object’s mass, what metric unit would you use? What English unit would you use? In the metric system you would use grams and in the English system you would use slugs.

9. If you wanted to measure an objects length, what metric unit would you use? What English unit would you use? Metric: meters. English: feet, yards, inches, or miles.

10. If you wanted to measure an object’s volume, what metric unit would you use? What English unit would you use? Metric: liters. English: gallons, pints, or quarts.

If you want explanations for some of the answers, you can comment to ask. Hope you did well and had fun!

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