Counting Atoms
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• Question 1
300 seconds
Q.

What does the subscript in a chemical formula tell you?

How many molecules are present

How many atoms are present

How many elements are present

How many neutrons are present

• Question 2
300 seconds
Q.

How many elements are in this chemical formula?

HCl

1

2

3

4

• Question 3
300 seconds
Q.

How many atoms of Carbon are in this formula? $C_{6\ }H_{12}O_6$

6

1

12

• Question 4
300 seconds
Q.

What elements are represented in this chemical formula?  $Fe_2O_3$

Iron, Oxygen

Francium, Europium, Oxygen

Ferrium, Oxygen

Berylium, Oxygen

• Question 5
300 seconds
Q.

What is the total number of atoms in this formula? $H_2O_2$

2

4

3

• Question 6
300 seconds
Q.

How many more atoms of Oxygen than than Magnesium are in this formula? $MgSO_4$

4

3

2

6

• Question 7
300 seconds
Q.

Which of the following elements is least likely to form a compound?

Hydrogen

Sodium

Argon

Potassium

• Question 8
300 seconds
Q.

Which of the following is a molecule of a compound?

$H_2$

$Cl_2$

$H_2O$

$F_2$

• Question 9
300 seconds
Q.

Which does not belong in the group?

Sodium

Glucose

carbon

Element

• Question 10
300 seconds
Q.

Is this an element or a compound?  $CaSO_4$

Element

Compound

• Question 11
300 seconds
Q.

Which chemical formula correctly displays 1 atom of nickel and 2 atoms of Fluorine?

niF2

NIF2

Ni1F2

NiF2

• Question 12
300 seconds
Q.

What is the total number of atoms in this chemical formula? $C_8H_3NaBr_{12}$

18

12

25

24

• Question 13
300 seconds
Q.

Which element has the greatest number of atoms?  $AgNO_3$

Silver

Gold

Nitrogen

Oxygen

• Question 14
300 seconds
Q.

Molecules that are made of more than one type of atom are called?

Molecules

Elements

Mixtures

Compounds

• Question 15
300 seconds
Q.

How many elements are in this chemical formula?  $NaHCO_3$