Chemical formula

How are elements and compounds different?

• An element is a pure substance while a compound is two or more elements combined in a fixed ratio.
• Elements are represented by a chemical formula and compounds are represented by a chemical symbol 
• Elements are NOT pure substance and compounds are pure substances 
• elements are made of two or more substance and compounds are made of one substance 

Which of the following is not a compound?

• HCl
• Cl
• NaCl
• CO2

Tags

NGSS.MS-PS1-1

How many different elements are in this chemical formula: C₂H₂ClK₃

• 6
• 8
• 2
• 4

Tags

NGSS.MS-PS1-1

Which statement best describes an element?

• made from mixture 
• thousands in the world
• pure, made of only one thing
• can be separated 

Which of the following is a compound?

• Co
• He
• CO
• H

Tags

NGSS.MS-PS1-1

Which best describes a compound? 

• found on the periodic table 
• made from two or more elements
• a pure substance 
• only 100 in the world 

Compounds are represented by a...

• Capital Letter
• Chemical symbol 
• Chemical formula 
• Chlorine 

Tags

NGSS.MS-PS1-1

A new compound has been discovered. Here is the chemical formula:
CHOFeNaNPb 

How many elements are in this compound?

• 5
• 6
• 7
• 10

Tags

NGSS.MS-PS1-1

Which one can be found on the periodic table?

• Compound 
• Element

Which one has more than one type of atom in it?

• Element
• Compound 

Tags

NGSS.MS-PS1-1