Chemical and Physical Changes Review

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What is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances with different properties, often accompanied by energy changes.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition, such as changes in state or shape.

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What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

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NGSS.MS-PS1-5

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How many atoms of phosphorus are in the equation P4 + 5O2 → P4O10?

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There are 4 phosphorus atoms.

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NGSS.MS-PS1-1

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How many atoms of oxygen are in the equation P4 + 5O2 → P4O10?

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There are 10 oxygen atoms.

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What is the purpose of balancing a chemical equation?

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To satisfy the law of conservation of mass by ensuring the number of atoms for each element is the same on both sides of the equation.

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NGSS.MS-PS1-5

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What happens when bubbles form during a reaction?

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The formation of bubbles indicates a chemical change, often due to the production of gas.

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NGSS.MS-PS1-2

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How many hydrogen atoms are in the reactants of the equation CH4 + 2O2 → CO2 + 2H2O?

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There are 4 hydrogen atoms in the reactants.

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NGSS.MS-PS1-1

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What is the total number of hydrogen atoms in the formula H6 + CO2 + 4CH + PO4 + 3Na + C2H5OH?

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There are 16 hydrogen atoms.

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NGSS.MS-PS1-1

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What is a reactant in a chemical reaction?

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A reactant is a substance that undergoes change during a chemical reaction, appearing on the left side of a chemical equation.

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