The elements iron (Fe), copper (Cu), and mercury (Hg) are classified as metals. Which physical property of metals do they all share? A. They are all magnetic.
B. They are all shiny, reddish color.
C. They all have the same melting points.
D. They all have thermal and electrical conductivity.

16. SC.8.P.8.5 (3 questions for this standard): Bill left a hammer out in the rain all day. The next morning it had rust on it. Oxygen and a metal chemically combine to form rust. What is rust an example of?
A. A mixture C. An element
B. A solution D. A compound

17. SC.8.P.9.2 (2 questions for this standard): Michael decides to bake bread one morning. He measures ingredients, mixes them other to make a dough, and cooks the dough in an oven. As the dough cooks, Michael observes the bread rising. Which of the following is evidence of the chemical change in Michael’s break-making process?
A. Sugar dissolving in the liquid batter.
B. The bread rising as carbon dioxide is released.
C. Water in the dough being released as water vapor.
D. The dry ingredients mixing with the wet ingredients.

18. SC.7.P.10.1: When solar radiation crosses space and moves toward Earth, it consists of many types of radiation. Together, these radiation types are known as the electromagnetic spectrum. Which of the following properties differentiates among the different types of radiation found in the electromagnetic spectrum?
A. Amplitudes C. Temperatures
B. Wavelengths D. Chemical makeup

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