Elements and Compounds

What is the chemical formula for table salt?

• NaCl

• H2O

• CO2

• N2

Tags

NGSS.MS-PS1-1

Which chemical formula represents water?

• HCl

• O2

• H2O

• C6H12O6

Tags

NGSS.MS-PS1-1

What is the chemical formula for oxygen gas?

• CO2

• NaOH

• O2

• HCl

Which chemical formula represents nitrogen gas?

• N2

• NaCl

• H2O

• C6H12O6

Tags

NGSS.MS-PS1-1

What is the chemical formula for carbon dioxide gas?

• HCl

• CO2

• NaOH

• O2

Tags

NGSS.MS-PS1-1

Na is a(n) ​ ​ ​ (a)  

• Element
• Compound

When is a chemical symbol used?

• To represent a chemical formula

• To represent a chemical element

• To represent a chemical equation

• For when you're feeling lazy and don't want to write it out

The chemical equation shown below represents a reaction that produces fuel for certain cars.

Which substance represented in this equation is classified as an element?​ (a)  

• CO
• H2O
• CO2
• H2

Tags

NGSS.MS-PS1-1

Which of the following is not a compound?

• Water
• Salt
• Oxygen
• Carbon Dioxide

Tags

NGSS.MS-PS1-1

Some students are using samples of different substances for a lab investigation. They plan to observe the physical properties of each substance and record their observations in a table like the one below.

Which of the substances observed are compounds?

• S, N2O4, O2

• N2O4, LiF

• S, Fe, Sr, Al

• Fe, LiF, Sr, Al

Tags

NGSS.MS-PS1-1