Chapter 7 pretest

Front

What does it mean to conserve atoms in a chemical equation?

Back

Conserving atoms means that the number of each type of atom on the reactant side of a chemical equation must equal the number on the product side, reflecting the law of conservation of mass.

Front

Can subscripts in a chemical formula be fractions?

Back

No, subscripts in a chemical formula must be whole numbers, as they represent the number of atoms of each element in a molecule.

Front

Can coefficients in a chemical equation be fractions?

Back

Yes, coefficients can be fractions, but they are typically expressed as whole numbers for simplicity in balancing equations.

Front

What are some clues that a chemical reaction has occurred?

Back

Clues include color change, temperature change, gas production, formation of a precipitate, and change in odor.

Front

What does the equation N2 + 3H2 -> 2NH3 represent in terms of mass?

Back

The equation indicates the molar relationship between the reactants and products, not the mass. It does not mean that 1g of N2 reacts with 3g of H2 to form 2g of NH3.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has equal numbers of each type of atom on both sides of the equation, adhering to the law of conservation of mass.

Front

What is the difference between a reactant and a product in a chemical reaction?

Back

Reactants are substances that undergo a chemical change, while products are the substances formed as a result of the reaction.

Front

What is the significance of coefficients in a balanced equation?

Back

Coefficients indicate the relative amounts of reactants and products involved in the reaction, allowing for stoichiometric calculations.

Front

What is a chemical reaction?

Back

A chemical reaction is a process in which one or more substances are converted into different substances with distinct properties.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it remains constant.