Counting Atoms

Front

What is the chemical formula for water?

Back

H₂O

Front

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

Back

2

Front

What is the law of conservation of mass?

Back

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

Front

How do you determine the number of atoms of an element in a compound from its chemical formula?

Back

Count the subscript next to the element's symbol in the formula.

Front

What is the total number of atoms in the compound C₂H₈O?

Back

11 (2 Carbon, 8 Hydrogen, 1 Oxygen)

Front

How many sodium atoms are present in 6NaCl?

Back

6 sodium atoms.

Front

What does a subscript in a chemical formula indicate?

Back

The number of atoms of the element in one molecule of the compound.

Front

If a reactant has a mass of 50g and produces a product of 40g, what can be inferred about the missing mass?

Back

The missing 10g likely escaped as gas.

Front

How many elements are present in the compound Na₂CO₃?

Back

3 (Sodium, Carbon, Oxygen)

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.