Science SCA #3 Review

Coefficients in chemical formulas...

• Multiply just the first atom

• Add to the subscripts at the end of the molecule

• Multiply elements without subscripts

• Multiply EVERYTHING!

How many atoms are there TOTAL in H₂SO₄ ?

• 6

• 5

• 7

• 3

What is C₂H₈O ?

• Element

• Letters

• Numbers

• Compound

How many Oxygen atoms are in Al₂(SO₄)₃?

• 4

• 12

• 7

• 24

Day and night is caused by the _____________ of earth on its axis.

• revolution
• orbit
• rotation
• space

What motion of the Earth takes 365 days?

• Rotation
• Tilting 
• Revolution
• Spinning

How many Neutrons are in Neon

• 10

• 21

• 20

• 30

How many electrons are in Potassium

• 19

• 39

• 20

• 58

The atomic number is the same as......

• the number of protons

• the number of electrons

• the number of neutrons

• the number of protons plus neutrons

Which of the following is an example of a precipitate?

• liquid evaporating into gas
• a solid formed from a frozen liquid
• a chunk solid formed from two liquids combining
• a liquid solution that contains two substances