Unit 6 AP Chemistry

How do you write the balanced equation of burned propane (C₃H₈) in the presence of oxygen to produce water and carbon dioxide?

• C₃H₈ + O₂ → H₂O + CO₂

• C₃H₈ + O₂ → 4H₂O + 3CO₂

• C₃H₈ + 5O₂ → 4H₂O + 3CO₂

• C₃H₈ + 3O₂ → 2H₂O + 3CO₂

Tags

NGSS.MS-PS1-5

If the percentage yield for a chemical reaction is 80.0%, the 

• actual yield is 80.0g for every theoretical yield of 100g.

• actual yield is 80 times as much as the theoretical yield.

• theoretical yield is 80 times as much as the actual yield. 

• theoretical yield is 80.0 g for every actual yield of 100g.

How would you be able to separate the hydrogen from the oxygen in water?

• by using a filter

• distillation

• electolysis (using electricity)

• by using tweezers

Tags

NGSS.MS-PS1-5

If matter is not uniform throughout and can be separated by physical means it is a ________.

• a compound

• an element

• a heterogeneous mixture

• a homogeneous mixture

Which of the following is the largest mass?

• 3.4 x 10^15 ng

• 34 hg

• 3.4 x 10^12 pg

• 3.4 x 10^-3 mg

Look at this image.  Which object has the LOWEST density in water? How? 

• The Ping Pong Ball because it floats to the top 

• The bolt because it has sunk to the bottom

• The soda cap because it is not just full of air like the Ping Pong ball

What is the element?Mass Number = 197Number of Electrons = 79Number of Neutrons = 118

• Gold

• Copper

• Boron

• Silver

• Tin

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the mass number of this element?

• 17

• 18

• 35

• 7

Tags

NGSS.MS-PS1-1

An atom with 2 protons, 3 neutrons, and 4 electrons has a charge of ____.

• +2

• -2

• +3

• 0

Tags

NGSS.HS-PS1-2

Which problem is balanced?
(Check ALL answers)

• PbO₂ + 2H₂

• SO₂ + H₂0 --> H₂SO₄

• 2Na + 2H₂O --> 2NaOH + H₂

Tags

NGSS.HS-PS1-7