TCI Lesson 13: Atoms in Chemical Reactions

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that involves the rearrangement of the molecular or ionic structure of a substance.

Front

What does the law of conservation of mass state?

Back

The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction.

Front

How many atoms are in a molecule of water (H2O)?

Back

There are 3 atoms in a molecule of water: 2 hydrogen (H) and 1 oxygen (O).

Front

What is the chemical formula for sulfuric acid?

Back

The chemical formula for sulfuric acid is H3SO4.

Front

How many oxygen atoms are in the compound 3H2C3O4N5?

Back

There are 4 oxygen atoms in the compound 3H2C3O4N5.

Front

What is the significance of coefficients in a chemical equation?

Back

Coefficients indicate the number of molecules or moles of a substance involved in a reaction.

Front

What is the formula for calculating the total number of atoms in a compound?

Back

To calculate the total number of atoms, sum the coefficients multiplied by the subscripts of each element in the compound.

Front

How many sodium (Na) atoms are in 6NaCl?

Back

There are 6 sodium (Na) atoms in 6NaCl.

Front

What happens to the mass of reactants in a chemical reaction?

Back

The mass of the reactants is equal to the mass of the products in a chemical reaction.