Counting Atoms

Definitions

100

What is a coefficient? 

The regular sized numbers that tell how many molecules there are 

200

What is a Subscript? 

The smaller numbers that tell how many atoms there are. 

300

a group of chemical symbols and numbers that represent the elements and the number of atoms of each element that make up a compound or a molecule is what?

chemical formula

400

a substance that consists of only one type of atom is what?

Element

500

a small particle that is the building block of matter is what?

Atom

Counting Atoms #1

100

How many atoms are in this formula? 

3H₂O

9

200

How many atoms are in this formula? 

Ba(OH)₂

5

300

How many atoms are in this formula? 

Ca₃(PO₄)₂

13

400

How many atoms are in this formula? 

K₂CO₃

6

500

How many atoms are in this formula? 

3Na₂SO₄

21

Counting Atoms #2

100

How many atoms are in this formula? 

2 H₂O

6

200

True or false, this equation = 100 atoms 

4 C₆H₁₂O₆           

FALSE 

For an extra 100 points, can any team give the actual number of atoms? 

300

How many atoms are in this formula?

2H(S₂O₄)₂

26

400

Is the total number of atoms in this formula 25?

 5Ca(OH)₂                            

YES! 

500

How many atoms are in this equation? 

 4Pb(NO₃)₂

36

Elements

100

What is this Element

H

Hydrogen

200

What is this element?

C

Carbon

300

What is the name of this element Symbol?

Al

Aluminum

400

Element or Compound?

H₂O

Compound

500

What is the name of these elements?

NaSO

Sodium, Sulfur, Oxygen

Mystery

100

How many Molecules?

3H₂O

3

200

How many Molecules are in 5Ca(OH)₂ 

5

300

Is water an Element or a compound?

Compound

400

What is the atomic number of the Chemical Symbol H

1

500

What is a Molecule?

two or more atoms that are held together and that act as a unit.