Help pleasee !! Chemistryy is realy Hardd:/

1. ___ May be changed to balance an equation.
A. Subscripts B. Coefficients C. Reactants D. Products

2. In the reaction CH4+2O2-->CO2+2H2O , oxygen is a ___?
A. Subscript B. Coefficient C. Reactant D. Product

3. In the equation 2C2H2(g)+5O2(g)-->4CO2(g)+2H2O(l) , the coefficient for oxygen is ___ ?
A. 5 B. 2 C. (g) D. 10

B. Coefficients
C. Reactant
A. 5

1. B
2. C
3. A