Front

Number of H in 3(NH₄)₂CrO₄

Back

24

Front

Balance this equation:
P₄+O₂  -->  P₂O₃

Back

P₄+ 3 O₂ --> 2 P₂O₃

Front

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

Back

the mass is the same

Front

Balance this equation: Al₂O₃ --> Al + O₂

Back

2Al₂O₃ --> 4Al+3O₂

Front

Fill in the blanks with coefficient: PCl₅+_ H₂O→_ HCl+H₃PO₄

Back

4, 5

Front

PCl₅ + ___ H₂O → ___ HCl + H₃PO₄

Back

4, 5

Front

Balance the equation: __ Al + __ FeO → Al₂O₂ + __ Fe

Back

2, 2, 2

Front

 Mg  +  ___ HCl  →   MgCl₂  +   H₂

Back

2

Front

Which problem is balanced? Options: PbO₂ + 2H₂, SO₂ + H₂0 --> H₂SO₄, 2Na + 2H₂O --> 2NaOH + H₂

Back

2Na + 2H₂O --> 2NaOH + H₂

Front

What is the little number after an element in a chemical equation called?
Example: H₂

Back

Subscript