1. Pure substances are characterized by:
a. Variable Melting Point
b. Variable properties
c. Non-uniform composition
d. Fixed melting point

2. A pure. substance can only be a/an:
a.Compound
b. Element and compound
c. Element
d. Heterogeneous mixture

3. Which of the following is NOT a property of a mixture?
a.The components can be easily separated
b.The original properties of the combined substances are changed
c.The proportion of the components is variable
d.Two or more substances are chemically combined

4.This contains a variety of elements and compounds that ARE NOT chemically combined.
a.Water
b.Elements
c.Mixture
d.Compounds

5.A mixture that does not look the same throughout: _______________________

6.The parts of mixture:
a.Cannot be separated
b.Can be separated
c.Have a new properties after they are mixed
d.Form a chemical combination of two or more atoms

7.Indicate which of the following is not a mixture.
a.Seawater
b.Natural orange
c.Oxygen gas
d.Salads

8.Which of these common substances is a Homogeneous mixture?
a.Table salt
b.Pure water
c.Carbon
d.Salt water

9. “Fruit Cocktail” is a mixture. It is made up of:
a. Many substances one kind of materials
b.Many substances but have one phase
c.Only one substance
d.Many substances thus, have two or more phases

10.Choose the correct statement that describes sea water.
a.Seawater is a Heterogeneous mixture
b.Seawater is formed only of one phase
c.Seawater consists of only one substance
d.Seawater is a pure substance

11.Choose the correct statement that describes fruits salads.
a.Fruit Salads consists of one type of substance
b.Fruit Salads is a Homogeneous mixture
c.Fruit salads is formed one phase
d.Fruit salad formed many phases

12.A liquid hast the following properties: one-phase colorless, boils at varying temperature. Which of the following BEST describes the liquid?
a.Compound
b.Substance
c.Element
d.Mixture

13.Which of the following lists of materials are composed of mixtures?
a.Vinegar, 70% alcohol solution, carbon
b.Blood, orange juice, air
c.Nitrogen, soldium chloride,water
d Carbon dioxide, bleach, oil

14.Which of the following is an example of a Homogeneous mixture?
a.Air
b.Ethyl alcohol
c.Sand and water
d.Mixed nuts

15.Which of the following is an example of a Heterogeneous mixture?
a.Black coffee
b.Spaghetti
c.Vinegar
d.40% ethyl alcohol​