NAME_________________________________________Date__________________
HOMEROOM_____________________
SCIENCE Answer Key 10/5/14
Relax! Take a deep breath! Count backwards from 10! Now
take your quiz!
1. When two substances combine chemically, the new substance that
forms has properties that
a)
b)
c)
d)
Are the same as those of the original two substances
Are different form those of the original two substances
Are a combination of those of the original two substances
Cannot be predicted
2. Which of the following is an alloy?
a)
b)
c)
d)
silver
nickel
gold
brass
3. Two different compounds can contain the same ________________.
(elements, molecule)
4. The compounds that makes up 60 percent of your body is________.
(CO2, H2O)
5. One property of most salts is that they melt at _______________
______________________. (high temperatures, low temperatures)
6. When hydrochloric acid and sodium hydroxide combine, they form
____________________. (table salt, sodium metal)
7. What is the least reactive element in Period 3?
Argon
8. What is the difference between a molecule and a compound?
Two or more atoms combine to make a molecule. Two or more elements
combine to make a compound. A molecule is the smallest part of a
compound that still has all the properties of a compound.
9. Give an example of a molecule that is a compound and one that is not a
compound.
1. Compounds H2O, CO2, C6H12O6, NaCl, etc.
2. Molecules that are not a compound O2, H2, carbon
molecule, etc.
10. List the properties of salts:
They are made from metals and non-metals
They form brittle crystals
All salts can dissolve in water
When salts are dissolved in water, they make good conductors of
electricity.
When acids react with bases they form salts and water