2014 8th Exam 26-30

The diagram below represents two atoms in a molecule of oxygen that combine chemically with one atom of carbon to form a carbon dioxide molecule. Carbon dioxide is an example of

• a mixture
• an element
• a solution
• a compound

Which weather condition commonly occurs along a cold front?

• clear skies
• precipitation
• warm temperatures
• dry air

Letters A, B, C, and D in the diagram below represent four positions of the Moon in its orbit around Earth. At which Moon position would a person on Earth see the entire lighted half of the Moon (full-Moon phase)?

• A
• B
• C
• D

 The arrows in the diagrams below represent the path of light as it strikes four different objects. Which diagram best represents the refraction of light?

• 1
• 2
• 3
• 4

To the left of the orange line, an incomplete periodic table is shown. To the right of the line, some information about the element lead (Pb) is shown. Which empty space on the periodic table should be where lead goes?

• A
• B
• C
• D