Can someone help me understand how to balance chemical equations?

Here are some equations I need help wit: 1. CuSO4 + Aluminum -----> Al2(SO4)3 2. In a double displacement reaction, sodium sulfide, Na2S, reacts with silver nitrate, AgNO3, to form sodium nitrate, NaNO3, and silver sulfide, Ag2S. balance the equation. 3. Hydrogen peroxide, H2O2, is sometimes used as a bleach... show more Here are some equations I need help wit:
1. CuSO4 + Aluminum -----> Al2(SO4)3
2. In a double displacement reaction, sodium sulfide, Na2S, reacts with silver nitrate, AgNO3, to form sodium nitrate, NaNO3, and silver sulfide, Ag2S. balance the equation.
3. Hydrogen peroxide, H2O2, is sometimes used as a bleach or as a disinfectant. Hydrogen peroxide decomposes to give water and molecular oxygen. Write an balanced equation for the decomposition reaction
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