purity

What is an alloy?

What is the meaning of Carat?

• A unit of weight

• A measurement of purity

• A vegetable

• A measurement of gold

What percentage of 9 carat gold is gold?

• 37.5%
• 41.6%

• 45.8%

• 33.3%

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 carat. The higher the carat, the purer the gold. How much is the concentration of gold in a 10 carat necklace?

• 99.5 %

• 75.6 %

• 50.3 %

• 41.7 %

Which of the following is not a pure substance?

• sea water

• salt

• water

• 24-carat gold

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

• pured

• compound

• impured

• atom

Which is a mixture of compounds?

• 
• 
• 
• 

Which is a pure substance?

• 
• 
• 
• 

What type of substance is pictured?

• element

• compound

• mixture

• solution