Atoms and Compounds

Which of the following is a compound?

• Si

• CO₂

• Cl

• He

• Ti

Which of the following represents an element?

• H₂O

• HCl

• NaCl

• Au

• CaCO₃

Which of the following could be a symbol on the periodic table of elements?

• CC

• Cc

• cc

• CcC

• CK1

Which of the following is an element?

• Gold

• Air

• Water

• Carbon Dioxide

• Nitrous Oxide

How many elements are there in CuSO₄?

• 1

• 2

• 3

• 4

• 5

What is a substance made of two or more elements that are chemically combined called?

• A. element

• B. compound

• C. mixture

• D. solution

Is salt (NaCI) a compound or an element?

• Compound

• element

What is the definition of a compound?

• The smallest part of any substance which can exist on its own

• Two or more atoms chemically joined together (can be the same or can be different)

• A simple substance in which all the atoms are identical

• Two or more different elements chemically joined together

All matter is made of .....

• energy 
• atoms 
• air
• chemistry

A substance that cannot be broken down into any other substance by ordinary chemical means is called

• a molecule.

• a mixture.

• an element.

• a compound.