Counting Atoms Flashcard

Front

What is the chemical formula for glucose?

Back

C6H12O6

Front

How many different elements are present in the chemical formula C6H12O6?

Back

3 (Carbon, Hydrogen, Oxygen)

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances, e.g., rusting of iron.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition, e.g., ripping paper.

Front

What are reactants in a chemical reaction?

Back

Substances that undergo change during a chemical reaction, e.g., in the reaction of methane and oxygen, CH4 and O2 are reactants.

Front

What is a coefficient in a chemical formula?

Back

A number placed in front of a chemical formula to indicate how many molecules are involved, e.g., in 2H2O, the coefficient is 2.

Front

What is the difference between a chemical and a physical change?

Back

Chemical changes result in new substances, while physical changes do not change the substance's chemical identity.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it is conserved.

Front

What is the significance of the subscript in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule, e.g., in H2O, the subscript 2 indicates there are 2 hydrogen atoms.

Front

What does the term 'element' mean in chemistry?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.