Practice Test: Matter & Energy

Which pair of elements are nonmetals and gases at room temperature and normal atmospheric pressure? Use the Periodic Table to find the elements location. Rembember the staircase divides the Metals and Nonmetals.

• 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.

• 1 carbon atom
• 2 carbon atoms
• 3 carbon atoms
• 10 carbon atoms

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? HINT: Find the missing mass. Remember the mass (g) of the reactants must remain equal on both sides of the arrow. USE A CALCULATOR.

• 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.

The names and chemical formulas of four substances are shown in the table. Which substance listed in the table is made up of the most atoms?

• Calcium carbonate
• Carbonic acid
• Silver phosphate
• Zinc sulfate

Which chemical equation contains the fewest oxygen atoms? HINT: Youn only have to count one side. Reactant or Product side. Remember R ----> P

• A
• B
• C
• D

Methane is burned in power plants to generate electricity. The chemical reaction for burning methane is represented by the chemical equation shown below. Which statement provides evidence that a chemical reaction occurred?

• The atoms move closer together.
• No new substances were created.
• The atoms are rearranged to create new substances.
• The number of atoms increased as the reaction took place.

Two solutions are mixed and react to produce the solid precipitate Fe(OH)3. The chemical reaction is shown by the balanced chemical equation. According to the Law of Conservation of Mass, what happens to the total mass as the reaction takes place?

• The total mass increases.
• The total mass decreases.
• The total mass doubles.
• The total mass remains the same.