Chemistry Unit Test

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FIRST NAME

Class Period

• 1
• 2
• 3
• 4
• 7

Which pair of elements are nonmetals and gases at room temperature and normal atmospheric pressure?

• Aluminum, Al, and neon, Ne
• Hydrogen, H, and nickel, Ni
• Chlorine, Cl, and Oxygen, O
• Cobalt, Co, and nitrogen, N

Students perform four experiments in which they combine different substances into a beaker. Their observations are shown in the table below. Which experiment most likely represents a chemical reaction?

• Experiment 1
• Experiment 2
• Experiment 3
• Experiment 4

Acetate is an ingredient used in many products, such as cleaning supplies, textiles, and cosmetics. The chemical formula for acetate is CH₃COO. How many carbon atoms are represented in this formula? Enter your answer below. Your answer must be a whole number.

A chemical equation in which two molecules of potassium chlorate, 2KClO₃, are decomposed results in the production of two simpler substances. The chemical equation for this reaction is shown below. What is the mass of 2KClO₃ that is decomposed in this reaction?

• 39.78 g
• 8.72 g
• 63.78 g
• 378.78 g

Students perform four investigations. Their observations are shown in the table below. In which investigation was a physical change observed?

• Investigation 1
• Investigation 2
• Investigation 3
• Investigation 4

Photosynthesis is the process that requires carbon dioxide, water, and sunlight to generate glucose and oxygen. The chemical equation for photosynthesis is shown below. Which statement accurately describes the atoms in the chemical equation for photosynthesis?

• Calcium, oxygen, and hydrogen atoms move closer together to form new substances.
• Carbon, helium, and oxygen atoms are rearranged to form new substances.
• Cobalt, oxygen, and hydrogen atoms move farther apart to form new substances.
• Carbon, oxygen, and hydrogen atoms are rearranged to form new substances.

Students performed a lab investigation on acids and bases. They recorded their observations in the table below. Based on this information, which sample most likely represents a base?

• Sample 1
• Sample 2
• Sample 3
• Sample 4