แผ่นงานBalancing Chemical Equations
คำถามทั้งหมด: 20
According to the Law of Conservation of Mass (Matter), Matter cannot be (a) or (b) , it can only be (c) . This means however many atoms of an element we have before a reaction must be (d) to the number after a reaction.
If 100 grams of vinegar and 5 grams of baking soda are poured in a container, a small amount of gas will be produced. What will the final mass of the products be if the gas is trapped in the container?
100 g
104 g
105 g
110 g
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
Example: H2
Coefficient
Subscript
Atom
Equation
Ex: 2H2 + O2 --> 2H2O
The coefficient in 3H2O is
6
5
2
3
In 3P2O5, there are (a) phosphorus (P) atoms and (b) oxygen (O) atoms.
(OH)2
What's unbalanced about this equation?
Al + O2 --> Al2O3
Oxygen (O) only
Aluminum (Al) only
Both oxygen and aluminum
Nothing; it is balanced.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
yes
no
4Fe + 3O2 --> 2Fe2O3
Al + O2 --> 2Al2O3
2C2H2 + 5O2 --> 4CO2 + 2H2O
What coefficient should be used to make the following equation balanced?
N2+O2--> __?__NO
1
2
3
4
How many HCl molecules do you need to balance this equation?
2Mg + (a) HCl ---> 2MgCl2 + 2H2
Drag and drop the coefficients that balance this equation 2 Fe + (a) Cl2 ----> (b) FeCl3
Balance this equation (a) N2 + (b) H2 --> (c) NH3
แป้นคำตอบBalancing Chemical Equations
คำถามทั้งหมด: 20
105 g
Subscript
3
Both oxygen and aluminum
no
2
