WORKSHEET

Name: ________________________________ Date: _________________________________

WORKSHEET

1. Chemical formulas can have three components.

a) The ________________ which are represented by a single uppercase letter, or represented by an uppercase letter followed by a lowercase letter. This tells you the types of elements in the compound.

b) The ________________ which are numbers that are found on the lower ________________- hand side of each element symbol. This tells you the number of ________________ of this element in the molecule. If an element symbol has no subscript next to it, then this indicates that there is only ________________ atom of this element in the molecule.

c) The ________________ which surround some groups of atoms indicate that the numbers of all of the atoms inside the bracket need to be ________________ by the ________________ on the outside of the bracket found on the lower ________________ - hand side of that bracket.

2. Record the number of each atom in each molecule, then record the total number of atoms in the molecule:

1) NaOH Element # of Atoms

2) HNO3 Element

# of Atoms

3) Li2O Element

# of Atoms

Total

4) Li2SO4 Element

# of Atoms

Total

5) NH4Cl Element

# of Atoms

Total

6) CaClO3 Element # of Atoms

Total

7) H2COCH2 Element # of Atoms

Total

8) Mg(OH)2 Element # of Atoms

Total

9) Al(OH)3 Element # of Atoms

Total

10) NH4C2H3O2 Element # of Atoms

Total

11) NaC2H3O2 Element # of Atoms

Total

12) (NH4)3PO4 Element # of Atoms

Total 13) Ca3(PO4)2

Element # of Atoms

Total

Total 14) Fe2(CO3)3

Element # of Atoms

Total

Total 15) Al2(SO3)3

Element # of Atoms

Total

ANSWER KEY Name: ________________________________

Date: _________________________________

WORKSHEET

1. Chemical formulas can have three components.

a) The _e_l_e_m__e_n_t_s_y_m_b_o_l_s_ which are represented by a single uppercase letter, or represented by an uppercase letter followed by a lowercase letter. This tells you the types of elements in the compound.

b) The ____su_b_s_c_r_ip_t_s_____ which are numbers that are found on the lower _______ri_g_h_t______- hand side of each element symbol. This tells you the number of ____a_to__m_s________ of this element in the molecule. If an element symbol has no subscript next to it, then this indicates that there is only ______o_n_e________ atom of this element in the molecule.

c) The _____b_r_a_c_k_e_ts_____ which surround some groups of atoms indicate that the numbers of all of the atoms inside the bracket need to be ___m__u_lt_ip__li_e_d_____ by the ___s_u_b_s_c_r_ip_t______ on the outside of the bracket found on the lower _______r_ig_h_t______ - hand side of that bracket.

2. Record the number of each atom in each molecule, then record the total number of atoms in the molecule:

1) NaOH Element Na O H Total

# of Atoms 1 1 1 3

2) HNO3 Element H N O Total

# of Atoms 1 1 3 5

3) Li2O Element Li O

# of Atoms 2 1

Total

3

4) Li2SO4 Element Li S O Total

# of Atoms 2 1 4 7

5) NH4Cl Element N H Cl Total

# of Atoms 1 4 1 6

6) CaClO3 Element Ca Cl O Total

# of Atoms 1 1 3 5

7) H2COCH2 Element # of Atoms

H

4

C

2

O

1

Total

7

8) Mg(OH)2 Element # of Atoms

Mg

1

O

2

H

2

Total

5

9) Al(OH)3 Element Al O H Total

# of Atoms 1 3 3 7

10) NH4C2H3O2

Element # of Atoms

N

1

H

7

C

2

O

2

Total

12

11) NaC2H3O2

Element # of Atoms

Na

1

C

2

H

3

O

2

Total

8

12) (NH4)3PO4

Element # of Atoms

N

3

H

12

P

1

O

4

Total

20

13) Ca3(PO4)2

Element # of Atoms

Ca

3

P

2

O

8

Total

13

14) Fe2(CO3)3

Element # of Atoms

Fe

2

C

3

O

9

Total

14

15) Al2(SO3)3

Element # of Atoms

Al

2

S

3

O

9

Total

14

Created by Anh-Thi Tang ? Tangstar Science Copyright ? May 2013 Anh-Thi Tang (a.k.a. Tangstar Science)

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