Chemical Reactions Quiz

An electrical circuit can be used to break down water into hydrogen and oxygen. In this process, electrical energy produces

• kinetic energy.

• physical changes.

• chemical changes.

• potential energy.

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Which of these is an example of a chemical reaction?

• storing milk by putting it into the freezer

• milk turning sour when left in a warm place

• mixing milk into a glass with chocolate powder

• allowing milk to evaporate, leaving behind powdered milk

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A student placed a solid in a liquid, which produced the results shown in the following diagram. Which of the following most likely took place?

• a chemical reaction

• a phase change

• a nuclear reaction

• a destruction of mass

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A student mixed some yellow sulfur powder with some iron filings. She was able to take the iron out of the sulfur by using a magnet. She then remixed the iron and sulfur in a test tube and heated it. After it cooled, she removed the substance from the test tube but could not separate the iron from the sulfur using the magnet. Which type of change occurred in the material when it was heated?

• a physical change because the iron reacted with the sulfur

• a chemical change because a new substance was formed

• a physical change because a compound was formed

• a chemical change because a magnet had to be used

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Emily made a chart that included physical changes and chemical changes. Which change should be categorized as a chemical change?

• iron becomes rusty

• a gold bar is melted

• lake water evaporates

• a granite rock is polished

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Matter can undergo different changes. Which best demonstrates a chemical change?

• salt dissolving

• wood burning

• water boiling

• ice melting

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Which is evidence of a chemical reaction?

• the light produced by magnesium when burned

• the evaporation of water from a solution

• the fizzing of a soft drink

• the heat from a light bulb

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Lighting a match and baking a cake are two actions that involve chemical changes. Why are these actions considered chemical changes?

• They change the state of matter.

• They create new substances.

• They change volume.

• They create energy.

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During photosynthesis, carbon dioxide and water combine according to the general equation: Carbon Dioxide + Water → Sugar + Oxygen. Why is photosynthesis a chemical reaction?

• because new substances are formed

• because an input of energy is required

• because the reactants are compounds

• because the products include an element

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Mr. Martin adds vinegar to baking soda. Which shows that the vinegar and baking soda react chemically?

• The mass of the products increases.

• The substances form a solution.

• One of the reactants is a liquid.

• One of the products is a gas.

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