NAMEAnswer Key
Date__________________
HOMEROOM_____________________
SCIENCE Answer Key week of Oct 13
Relax! Take a deep breath! Count backwards from 10! Now
take your quiz!
1. What happens when a metal is heated to a high temperature?
a)
b)
c)
d)
It crumbles
It explodes
It catches on fire
It melts
2. Two different compounds can contain the same ________________.
(elements, molecule)
3. All salts can form_______________. (cubes/crystals)
4. The compounds in a _____________ are not chemically combined.
(solute, mixture)
5. One property of most salts is that they melt at _______________
______________________. (high temperatures, low temperatures)
6. Which of these is a solute in seawater?
a)
b)
c)
d)
Salt
Water
Sand
Fish
7. What is the difference between a molecule and a compound?
A molecule is the smallest part of compound that still has all the same
properties of that compound. When two or more atoms combine they
make a molecule. When two or more elements combine they make a
compound.
8. Give an example of a molecule that is a compound and one that is not a
compound. Answers will vary
1. Molecule that is not a compound: Oxygen molecule
2. Molecule that is also a compound: Water molecule
9. List five properties of metals:





Luster
Malleability
All metals are ductile
They are good conductors of heat and electricity
All metals are solid at room temperature except for Mercury
10. What is an alloy? Give an example of an alloy and tell why it is better
than a pure metal.
An alloy is a mixture of a metal and non-metal or two metals. Alloys usually
have properties that are more useful that just the metal itself. For example
Stainless steel is an alloy of iron that does not rust.