1. Which of the following statements about compounds is correct?

a. At least one of the elements in a mixture must be a gas.

b. The elements in a compound are always present in the same ratio.

C. It is easy to separate a compound into the elements that makes it up.

d. The properties of compound are the same as the properties of the elements of which they made of.

2. What substance is made up of only one type of atom?

a. Gas b. mixture c. element d. compound

3. When a substance is analyzed using an electron microscope, it is found to contain only one type of atom. What substance is this?

a. A mixture b. an element c. a compound d. neither of the three choices

4. Which of these substances is a compound?

a. Iron b. Oxygen c. Hydrogen d. Sodium fluoride

5. How many types of atom are present in a compound?

a. One b. any number c. two or more d. less than three

6. A student is researching an element that is not a conductor of heat or electricity but is shiny like a metal. Which category does the metal belong?

a. Metal b. metalloid c. non-metal d. compounds

7. Which of these has a shiny luster?

a. Metal b. metalloid c. non-metal d. compounds

8. Which of the following is true about non-metals?
a. Found along the stair step line
b. Conductors of heat and electricity
c. On the left side of the periodic table
d. Found to the right of the stair step line

9. Which property is true for metalloids?

a. They are not elements
b. They never conduct electricity and is usually dull.
c. They always conduct electricity and is shiny
d.They are semiconductors with properties of both metals and nonmetals.

10.If an elemt is a semi-conductor, which classification correctly describes it?

a.Metal b.nonmetal c.metalloid d.compound


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