Reactants and Products review

Front

What is a subscript in a chemical formula?

Back

A subscript is a number written below and to the right of an element symbol in a chemical formula, indicating the number of atoms of that element in a molecule.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula in a reaction, indicating how many molecules of that substance are present.

Front

What are reactants in a chemical reaction?

Back

Reactants are the starting substances in a chemical reaction that undergo change to form products.

Front

What are products in a chemical reaction?

Back

Products are the substances formed as a result of a chemical reaction.

Front

In the reaction 2H₂ + O₂ → 2H₂O, what are the reactants?

Back

The reactants are 2H₂ (hydrogen gas) and O₂ (oxygen gas).

Front

In the reaction 2H₂ + O₂ → 2H₂O, what is the product?

Back

The product is 2H₂O (water).

Front

What does the law of conservation of mass state?

Back

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

Front

If the mass of the reactants is 18g, what is the mass of the products?

Back

The mass of the products is also 18g, according to the law of conservation of mass.

Front

What is the difference between a molecule and an atom?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

Front

What does the chemical formula CH₄ represent?

Back

The chemical formula CH₄ represents methane, a molecule consisting of one carbon atom and four hydrogen atoms.