Chemistry Review

Which of these is a chemical change?

• Liquid water freezing

• Salt and water are mixed together

• Iron rusting

• An apple is cut up

When two liquids are mixed together, the mixture's temperature increases rapidly. Is this a chemical or physical change?

• Physical

• Chemical

• Neither

• Both

Is metal rusting a physical or chemical change?

• Physical

• Chemical

• 1

• 3

• 4

• 20

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

• 3
• 6
• 12
• 24

How many atoms of Oxygen are in Fe(NO₃)₃ ?

• 6
• 3
• 9
• 1

How many Hydrogen atoms are in 4H₂O?

• 6

• 8

• 2

• 4

The Law of Conservation of Mass states Matter is NEITHER created nor destroyed.

• True

• False

If a reaction starts with a total 75g of reactants it should produce 

• a total of 40g of products
• a total of 75g of products
• a total of 180 g of products
• None of the above

24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride

• 62 
• 38
• 24
• 14