Elements and Compounds

The one or two letters used to represent elements 

• Yield sign
• Coefficient
• Chemical Symbol
• Subscript

Element or compound?
H₂O

• element
• compound

How many elements are in C₆H₁₂O₆?

• 1
• 2
• 3
• 24

A physical change is?

• It changes the object into something different
• Objects or substances undergo a change that does not change their chemical composition
• it is just like a chemical reaction
• Paper burning

Element or compound?
O₂

• Element
• Compound

A chemical change is?

• a shoe lace cut in half
• doesn't change anything
• changes the look of an object
• change that results in the formation of new chemical substances

How many Hydrogen atoms are in H₂O?

• zero
• one
• two
• three

How many atoms of carbon (C) are in C₆H₁₂O₆?

• 3
• 6
• 12
• 24

The small number that is written below the symbol and shows how many atoms of each element is present.  

• Compound
• Molecule
• Coefficient
• Subscript

Which of the following is a compound?

• Co
• O₂
• C
• CO₂