2.03 Conservation of Mass (BrainPop)

In science, a law is:

• A rule governing what you are permitted to do.

• A generalization about how the physical universe works.

• A legal document that describes a rule of conduct.

• A statute enacted by a legislative body.

What is true of a substance with a lot of mass?

• It contains a lot of matter

• It has a large volume

• It has a high density

• It has a low frequency

The law of conservation of mass says substances can neither be _______ nor ___________.

• Built; torn down

• Blended together; separated

• Created; destroyed

• Condensed; extracted

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How is weight different from mass?

• Weight changes depending on gravity; mass stays constant throughout the universe.

• Weight is measured in grams; mass is measured in newtons.

• Weight can be converted to energy; mass cannot.

• Weight is measured with a scale; mass is measured with a triple-beam balance.

Sodium and chlorine combine to form sodium chloride, or table salt. Sodium and chlorine are:

• Producers

• Products

• Reactionaries

• Reactants

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When sodium and chlorine combine to form sodium chloride, sodium chloride is the:

• Originator

• Reactant

• Product

• Produce

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4 grams of hydrogen and 32 grams of oxygen will combine to form:

• 36 grams of water

• 28 grams of hydroxide

• 32 grams of oxygen

• 36 grams of deuterium

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In a chemical reaction, 4 grams of sodium must combine with how many grams of chlorine to produce 10 grams of table salt?

• 4 grams

• 6 grams

• 8 grams

• 10 grams

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What was Antoine Lavoisier's contribution to the law of conservation of mass?

• He was the first person to think of it

• He was the first person to propose it in a scientific way

• He came up with a widely-read, precise description

• He was the first person to perform a chemical reaction

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Which of the following describes a chemical reaction?

• Oxygen interacts with iron to form rust

• Ice melts into water

• Carbon dioxide freezes to make dry ice

• Rocks split apart over many years due to weathering

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