Semester 1 Review

Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)

• H₃SO₄
• HSO₄
• H₄S₃O
• H₂O

How many Sodium (Na) are in 6NaCl?

• 1
• 12
• 6

Which of the following statements is true about the molecule below?
2NaC₂H₃O₂

• There are 3 Nitrogen atoms
• There are 2 Carbon atoms
• There are 6 Hydrogen atoms
• There are 2 Oxygen atoms

How many molecules are in 10MgCl₂?

• 10
• 2
• 30
• 13

Which of these models best represents water, H₂O?

• A
• B
• C
• D

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

• 6
• 3
• 9
• 1

How many Nitrogen atoms are in (NH₄)₂CrO₄?

• 1

• 2

• 8

• 16

What is the Law of Conservation of mass?

• Mass is created in a chemical reaction
• Mass is created in a physical change
• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
• Mass is never created or destroyed

10 g of a solid chemical reacts with a 10 g of a liquid chemical, the reaction bubbles and changes the color of the liquid.  The colored liquid weighs 13 g, what can be concluded?

• The gas produced from the bubbles weighed 5 g
• The bubbles were evidence of 7 g of matter being destroyed
• The gas produced weighed 7 g
• The gas produced weighed 13 g

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