Worksheet: Balancing Equations Name KEY I. Fill in the ...

Worksheet: Balancing Equations

Name ________K_E_Y________

I. Fill in the blanks with the most appropriate term:

A ________ch_em_i_ca_l ____ _____e_qu_a_tio_n_______ tells the story of a chemical

reaction. ______R_ea_c_ta_nt_s _____ are the starting substances in the reaction

while ______p_ro_d_uc_ts______ are the new substances that are formed. The

large numbers in front of some of the formulas are called

_____c_o_ef_fic_ie_nt_s_____. These numbers are used to ______b_a_la_nc_e______ the

equation because chemical reactions must obey the Law of

_____C_on_s_er_va_ti_on_____ of Matter. The number of atoms of each element on

both sides of the equation must be _______eq_u_al_______ because matter

cannot be ______c_re_a_te_d ______ or ______de_st_ro_y_ed______. When balancing

equations, the only numbers that can be changed are _____c_oe_ff_ic_ie_nt_s _____;

remember that ___fo_rm_u_la_s_/ _su_b_sc_ri_pt_s __ must never be changed in order to

balance an equation.

II. Balance the following equations:

1.

4Al + 3O2 2Al2O3

2.

C3H8 + 5O2 3CO2 +

4H2O

3.

Al(NO3)3 +

3NaOH

Al(OH)3 +

3NaNO3

CHEMISTRY: A Study of Matter

? 2004, GPB

6.24a

4.

2KNO3

2KNO2 +

O2

5.

3O2 +

CS2

CO2 +

2SO2

6.

2KClO3

2KCl +

3O2

7.

3BaF2 +

2K3PO4

Ba3(PO4)2 +

6KF

8.

H2SO4 +

Mg(NO3)2

MgSO4 +

2HNO3

9.

2Al +

3H2SO4

Al2(SO4)3 +

3H2

10.

WO3 +

3H2

W +

3H2O

CHEMISTRY: A Study of Matter

? 2004, GPB

6.24b

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