Exploring Elements and Compounds

Which of the following is an element?

• Water

• Oxygen

• Salt

• Sugar

What is the chemical symbol for sodium?

• S

• Na

• So

• N

Which of the following is a compound?

• Iron

• Hydrogen

• Carbon dioxide

• Gold

Tags

NGSS.MS-PS1-1

Which of the following best describes a compound?

• A substance made of only one kind of atom

• A mixture of two or more elements that are not chemically combined

• A substance made of two or more elements chemically combined

• A substance that cannot be broken down

Which of the following is NOT an element?

• Helium

• Nitrogen

• Ammonia

• Silver

Which of the following is a correct chemical formula for water?

Tags

NGSS.MS-PS1-1

Which statement correctly explains the difference between elements and compounds?

• Elements are made of molecules, compounds are made of atoms.

• Elements cannot be broken down into simpler substances, but compounds can.

• Compounds are found only in nature, elements are man-made.

• Elements are always gases, compounds are always solids.

If you mix iron filings and sulfur powder together, what type of substance do you create?

• An element

• A compound

• A mixture

• A solution

Which of the following is an example of a compound being formed from its elements?

• Melting ice to form water

• Mixing sand and salt

• Burning hydrogen in oxygen to form water

• Dissolving sugar in water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Why is salt (NaCl) considered a compound and not an element?

• It is made of only one kind of atom

• It is a mixture of two elements

• It is made of two elements chemically combined in a fixed ratio

• It can be separated by physical means

Tags

NGSS.MS-PS1-1