1s Sems Review B

Front

What is a compound?

Back

A chemical combination of elements.

Front

According to the Law of Definite Composition, how do elements in a compound combine?

Back

In the same proportion by mass.

Front

If you were to combine 80 grams of oxygen with some hydrogen, how much hydrogen would you need to completely use up all of the oxygen?

Back

20 grams.

Front

What is the accepted mass ratio for the mass of magnesium to the mass of oxygen?

Back

1.52.

Front

What is the mass ratio of hydrogen to oxygen in water?

Back

1:8.

Front

Define the term 'element'.

Back

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

Front

What is the difference between a mixture and a compound?

Back

A mixture is a physical combination of substances, while a compound is a chemical combination of elements.

Front

What is the significance of the Law of Conservation of Mass in chemical reactions?

Back

Mass is neither created nor destroyed in a chemical reaction; it is conserved.

Front

Explain the concept of molar mass.

Back

The mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

What is a chemical formula?

Back

A representation of a substance using symbols for its constituent elements and numerical subscripts to indicate the number of atoms.