Fast and Curious: Unit 7 Lesson 4 (Chemical Reactions)

What is the definition of Independent Variable?

• A variable that is measured in response to changes in the independent variable.
• An independent variable is a variable that is changed or controlled in a scientific experiment to test its effects on the dependent variable.
• A variable that is not related to the experiment's outcome.
• A variable that remains constant throughout the experiment.

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What is the definition of Dependent Variable?

• A dependent variable is the variable that does not change regardless of the independent variable.
• A dependent variable is the variable that is manipulated by the researcher.
• A dependent variable is the variable that is measured in an experiment, which is affected by changes in the independent variable.
• A dependent variable is the variable that remains constant in an experiment.

What is the definition of an experiment Control?

• An experiment control is a variable that is manipulated during the experiment.
• An experiment control is the main hypothesis being tested.
• An experiment control is the group that receives no treatment at all.
• An experiment control is a standard used to ensure that the results of an experiment are due to the independent variable.

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What is the definition of Chemical Formula?

• A method to calculate the mass of a substance.
• Combination of chemical symbols and numbers to represent a substance.

• A visual representation of molecular structures.
• A technique for balancing chemical reactions.

What is the definition of Chemical Equation?

• A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products.

• A chemical equation describes the physical state of matter.
• A chemical equation is a visual diagram of molecules.
• A chemical equation is a list of all known chemicals.

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What is the definition of Reactant?

• A substance that participates in a chemical reaction.

• A reactant is a type of energy released during a reaction.
• A reactant is a catalyst that speeds up reactions.
• A reactant is a product of a chemical reaction.

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What is the definition of a chemical Product?

• A chemical product is a type of physical change.
• A chemical product is a mixture of different elements.
• Substance that forms in a chemical reaction.

• A chemical product is a naturally occurring substance.

What is the definition of an Endothermic Reaction?

• An endothermic reaction releases heat.
• An endothermic reaction occurs without any heat exchange.
• An endothermic reaction is a reaction that absorbs heat.
• An endothermic reaction is a process that generates energy.

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What is the definition of an Exothermic Reaction?

• An exothermic reaction is a reaction that releases energy, usually in the form of heat.
• An exothermic reaction occurs only in gases.
• An exothermic reaction is a process that does not involve heat transfer.
• An exothermic reaction absorbs energy from the surroundings.

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What is the Law of Conservation of Energy?

• Energy can be destroyed but not created.
• States that energy cannot be created or destroyed but can be changed from one form to another.

• Energy is always lost in transformations.
• Energy can be created from nothing.

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NGSS.MS-PS3-5