What is the law that states mass is conserved in a chemical reaction?

• Law of Conservation of Energy

• Law of Conservation of Mass

• Law of Conservation of Momentum

• Law of Conservation of Charge

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NGSS.MS-PS1-5

• 6

• 12

• 18

• 24

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NGSS.MS-LS1-6

NGSS.MS-PS1-5

Which of the following is a basic concept of the conservation of mass in chemical reactions?

• Mass can be created or destroyed.

• Mass is lost in chemical reactions.

• Mass is conserved and remains constant.

• Mass is only conserved in physical changes.

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NGSS.MS-PS1-5

In a chemical reaction, if the mass of the reactants is 50 grams, what should be the mass of the products?

• 25 grams

• 50 grams

• 75 grams

• 100 grams

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following best describes a chemical equation?

• A representation of a chemical reaction using symbols and formulas.

• A mathematical equation involving numbers.

• A description of physical changes.

• A list of elements in the periodic table.

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NGSS.MS-PS1-5

What is the role of coefficients in a balanced chemical equation?

• They indicate the number of molecules or moles of a substance.

• They show the speed of the reaction.

• They represent the temperature at which the reaction occurs.

• They indicate the color of the substances involved.

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NGSS.MS-PS1-5

• 1

• 2

• 4

• 6

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which of the following is an example of a simple procedure in balancing chemical equations?

• Changing the subscripts of compounds.

• Adding coefficients to balance the number of atoms.

• Removing elements from the equation.

• Altering the chemical formulas of reactants.

What does the subscript in a chemical formula represent?

• The number of molecules.

• The number of atoms of an element in a molecule.

• The mass of the element.

• The charge of the element.

• 3

• 6

• 12

• 18

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NGSS.MS-PS1-1