Counting Atoms

Front

What is the total number of Hydrogen (H) atoms in the compound 3(NH₄)₂CrO₄?

Back

24

Front

How many Hydrogen (H) atoms are present in 4H₂O?

Back

8

Front

What is the number of Sodium (Na) atoms in 6NaCl?

Back

6

Front

How many Oxygen (O) atoms are in a single molecule of H₂O?

Back

1

Front

What is the number of Nitrogen (N) atoms in the compound (NH₄)₂CrO₄?

Back

2

Front

Define a molecule in chemistry.

Back

A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

Front

What is the significance of subscripts in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule. For example, in H₂O, the '2' indicates there are two hydrogen atoms.

Front

Explain the difference between a compound and a mixture.

Back

A compound is a substance formed when two or more elements chemically bond together, while a mixture is a combination of two or more substances that retain their individual properties.

Front

What does the term 'coefficient' refer to in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula in an equation that indicates how many molecules or moles of that substance are involved.

Front

How do you determine the number of atoms in a compound with parentheses?

Back

Multiply the number of atoms inside the parentheses by the coefficient outside. For example, in 3(NH₄)₂, multiply 2 by 3 to get 6 nitrogen atoms.