Elevate Science Topic 6

The state in which one object’s distance from another is changing

• force

• motion

• work

• power

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The energy of stretched or compressed objects

• kinetic energy

• gravitational potential energy

• elastic potential energy

• potential energy

The internal stored energy of an object; also the energy an object has because of its position

• kinetic energy

• positional energy

• energy of motion

• potential energy

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The ability to do work or cause change

• energy

• force

• power

• work

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During a science experiment in a closed container, Ava claims that the mass of the products is less than the mass of the reactants. How would you evaluate this claim?

• Agree, because mass is often lost as energy

• Disagree, because the law of conservation of mass states that mass is conserved

• Agree, because some mass is converted to gas

• Disagree, because mass is always gained in a reaction

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William and Priya are in a chemistry lab. How can they model a chemical reaction using a chemical equation?

• By writing the names of the reactants and products

• By using symbols and formulas to represent the reactants and products

• By drawing pictures of the reactants and products

• By listing the physical properties of the reactants and products

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During a science experiment, Benjamin and Maya mixed two chemicals in a sealed container. Which statement best describes the law of conservation of mass in this scenario?

• Mass can be created or destroyed in a chemical reaction

• The mass of the reactants is equal to the mass of the products in a chemical reaction

• Mass is always lost in a chemical reaction

• Mass is always gained in a chemical reaction

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Avery left her iron bicycle outside in the rain. Explain why the rusting of the bicycle is considered a chemical change.

• It involves a change in the physical state of iron

• It results in the formation of a new substance, iron oxide

• It can be easily reversed by physical means

• It only affects the appearance of iron

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Ava and Lily are conducting an experiment in their kitchen to demonstrate the conservation of mass in a chemical reaction. Describe how they would use a model to show this principle.

• By showing that the number of atoms of each element is the same before and after the reaction

• By showing that the volume of the reactants is equal to the volume of the products

• By showing that the temperature of the reactants is the same as the temperature of the products

• By showing that the color of the reactants is the same as the color of the products

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Samuel is baking a cake. What is a chemical change in this process?

• A change in the state of matter

• A change that affects the physical properties of a substance

• A change that results in the formation of new substances

• A change that can be easily reversed

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