1. Week 6 1. A group of identical atoms would be classified as
A solution.
A compound.
An element.
A mixture

2. 2. How do compounds differ from elements?
Compounds contain only one kind of atom and elements contain more than one kind of atom.
Elements contain only one kind of atom and compounds contain more than one kind of atom.
Compounds form only ionic bonds.
Compounds form only covalent bonds.

3. 3. Which of the following does not create a mixture?
Melting ice
Stirring flour in water
Salting ice
Making a salad

4. 4. An unknown substance is provided in a science class
4. An unknown substance is provided in a science class. It consists of particles that are different colors and different sizes and are unevenly distributed throughout the substance. This substance is
An element.
A compound.
A mixture.
A solution.

5. 5. Marsol mixes olive oil and red wine vinegar together with spices in a bottle. She closes the cap and agitates the mixture. What does she end up with?
A solution of olive oil, vinegar and spices.
A mixture of olive oil, vinegar and spices
A solution of olive oil and vinegar, with spices mixed in.
A compound of olive oil and vinegar, with spices mixed in.

6. 6. Which statement is MOST accurate?
A pure substance contains just one kind of matter.
A pure substance has the same composition throughout.
A pure substance can be broken down by physical means.
A pure substance is less stable than a compound.

7. Turn in your homework! 7. Which of these statements is true?
The particles in a mixture are from the same element.
The particles in a solution can be seen in bright light.
The particles in a mixture can be separated only by chemical means.
The particles in some mixtures can be separated by filtration.

8. 8. The vegetable matter in Pierre’s compost pile changes into black “soil.” He observes that the compost pile is always warmer than the outside air temperature. Which of the following describes this changes?
The vegetable matter undergoes a physical change that releases energy.
The vegetable matter undergoes a chemical change that releases energy.
The vegetable matter undergoes a physical change that absorbs energy.
The vegetable matter undergoes a chemical change that absorbs energy.

9. 9. Which of these statements about mixtures is false?
A mixture is made up of two or more pure substances.
A mixture can be separated by physical means.
One of the substances in a mixture must be a liquid.
A mixture does not have a definite makeup.

10. 10. Which of the following correctly places the phases of water from MOST dense to the LEAST dense?
Solid, liquid, gas, plasma
Solid, gas, plasma, liquid
Liquid, solid, gas, plasma
Plasma, solid, liquid, gas