Purity

Which one describes purity or pure element?

• it has two or more different types of atom

• it has one and the same type of atoms all throughout

• it is made up of sub-atomic particles

• it is a matter and has the different subatomic particles

Gold is divided into 24 parts, with each single unit called a karat. The higher the karat, the purer the gold. How much is the concentration of gold in a 10 K neclace?

• 99.5 %

• 75 %

• 50 %

• 41.7 %

Gold is divided into 24 parts, with each single unit called a karat. The higher the karat, the purer the gold. How much is the concentration of gold in a 14 K neclace?

• 99.5 %

• 75 %

• 58.3 %

• 41.7 %

If a diamond has 1000 parts, it is said to be pure diamond. If the diamond is mixed with parts of other atoms, what is the concentration of a diamond if it has at least 800 parts?

• 50 %

• 60 %

• 70 %

• 80 %

When there is more than one product they are mixed up together, this means that the product produced is ______.

• pured

• compound

• impured

• atom

Some reactions would lead to impurity because it has two or more products during the reaction. Why do you think it is hard to produce pure product?

Select two correct responses.

• because some different types of atoms of compounds are mixed up

• because reactants are made up of two different compounds reacting together

• atoms do not react each chemically

• atoms are attracted to each other