Science Teks 8.5d Quiz - Lewis

What is a chemical reaction?

• A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

• A chemical reaction is a process that leads to the destruction of chemical substances.

• A chemical reaction is a process that leads to the separation of chemical substances.

• A chemical reaction is a process that leads to the formation of new elements.

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NGSS.MS-PS1-5

NGSS.MS-PS1-1

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Why is it important to balance chemical equations?

• To make the equation look more balanced

• To ensure the law of conservation of mass is obeyed and to show the correct ratio of reactants and products.

• To confuse students

• To waste time

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NGSS.MS-PS1-5

How do you balance a chemical equation?

• By adjusting the coefficients in front of the chemical formulas.

• By changing the subscripts in the chemical formulas.

• By adding or removing elements from the equation.

• By changing the order of the chemical formulas.

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What is the law of conservation of mass?

• Mass can change form in a chemical reaction.

• Mass cannot be created or destroyed in a chemical reaction.

• Mass can be destroyed in a chemical reaction.

• Mass can be created in a chemical reaction.

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NGSS.MS-PS1-5

What is the difference between reactants and products in a chemical equation?

• Reactants and products are the same thing in a chemical equation.

• Reactants are the substances formed as a result of a chemical reaction, while products are the substances present at the beginning of the reaction.

• Reactants are the substances present at the beginning of a chemical reaction, while products are the substances formed as a result of the reaction.

• Reactants and products are both formed as a result of a chemical reaction.

What is the coefficient in a chemical equation?

• The coefficient in a chemical equation is the number that appears after a chemical formula.

• The coefficient in a chemical equation is the sum of the reactants and products.

• The coefficient in a chemical equation is the number of atoms in a molecule.

• The coefficient in a chemical equation is the number that appears in front of a chemical formula.

What is the subscript in a chemical equation?

• A number written below and to the right of a chemical symbol

• A symbol written above and to the right of a chemical symbol

• A letter written below and to the right of a chemical symbol

• A number written above and to the left of a chemical symbol

What is the purpose of counting atoms in a chemical equation?

• To determine the stoichiometry of the reaction.

• To determine the temperature of the reaction.

• To calculate the molar mass of the compound.

• To balance the equation.

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NGSS.MS-PS1-5

What are the steps to count atoms in a chemical equation?

• Write down the unbalanced chemical equation, identify the subscripts, multiply by the coefficients, and add up the total number of atoms.

• Write down the balanced chemical equation, identify the subscripts, multiply by the coefficients, and add up the total number of atoms.

• Write down the unbalanced chemical equation, identify the coefficients, multiply by the subscripts, and add up the total number of atoms.

• Write down the balanced chemical equation, identify the coefficients, multiply by the subscripts, and add up the total number of atoms.

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NGSS.MS-PS1-1

What is the difference between a chemical formula and a chemical equation?

• A chemical formula represents the composition of a substance, while a chemical equation represents a chemical reaction.

• A chemical formula is written in words, while a chemical equation is written in symbols.

• A chemical formula is used in organic chemistry, while a chemical equation is used in inorganic chemistry.

• A chemical formula represents a chemical reaction, while a chemical equation represents the composition of a substance.

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