Question 19
Balance the following the chemical equation
_Na2O + _ CaBr2 → _ NaBr + _ CaO
A. 1:1:2:1
B. 1:1:1:2
C. 1:2:1:1
D. 2:1:1:1
A. 1:1:2:1
To balance the chemical equation, we need to make sure that there is an equal number of each type of atom on both sides of the equation. Let's go through each element step by step.
On the left side of the equation, we have:
Na: 2
O: 1
Ca: 1
Br: 2
On the right side of the equation, we have:
Na: 1
Br: 1
Ca: 1
O: 1
To balance the sodium (Na) atoms, we need to put a coefficient of 2 in front of NaBr:
Na2O + _ CaBr2 -> 2 NaBr + _ CaO
Now, the sodium atoms are balanced:
Na: 2 -> 2
Next, let's balance the bromine (Br) atoms. We have 2 bromine atoms on the left side, but only 1 on the right side. To balance this, we need to put a coefficient of 2 in front of CaBr2:
Na2O + 2 CaBr2 -> 2 NaBr + _ CaO
Now, the bromine atoms are balanced:
Br: 2 -> 2
Finally, let's balance the oxygen (O) and calcium (Ca) atoms. We have 2 oxygen atoms on the left side and 1 on the right side. To balance this, we need to put a coefficient of 2 in front of CaO:
Na2O + 2 CaBr2 -> 2 NaBr + 2 CaO
Now, the oxygen atoms are balanced:
O: 2 -> 2
And the calcium atoms are also balanced:
Ca: 1 -> 2
The balanced chemical equation is:
Na2O + 2 CaBr2 -> 2 NaBr + 2 CaO
Therefore, the answer is A. 1:1:2:1
To balance a chemical equation, you need to ensure that the number of atoms of each element is equal on both sides of the equation.
Let's start by counting the number of atoms for each element in the given equation:
On the left side:
- Sodium (Na): 2
- Oxygen (O): 1
- Calcium (Ca): 1
- Bromine (Br): 2
On the right side:
- Sodium (Na): 1
- Bromine (Br): 1
- Calcium (Ca): 1
- Oxygen (O): 1
Now, we can see that the number of atoms of each element is not balanced yet. We need to adjust the coefficients (the numbers written in front of each compound or element) to balance the equation.
To balance the equation, we start by adjusting the coefficients for the compounds that have the larger number of atoms. In this case, that is Na2O and CaBr2.
Let's start with adjusting the sodium atoms. Since there are 2 sodium atoms on the left side and only 1 on the right side, we need to multiply NaBr by 2 to balance the sodium atoms.
Now the equation becomes:
Na2O + CaBr2 → 2 NaBr + CaO
Next, let's balance the bromine atoms. Since there are 2 bromine atoms on the left side and only 1 on the right side, we need to multiply CaBr2 by 2 to balance the bromine atoms.
Now the equation becomes:
Na2O + 2 CaBr2 → 2 NaBr + CaO
Finally, let's check the oxygen and calcium atoms. The oxygen atoms are already balanced, but the calcium atoms are not. There is only 1 calcium atom on the left side, so we need to multiply CaO by 2 to balance the calcium atoms.
The final balanced equation is:
Na2O + 2 CaBr2 → 2 NaBr + 2 CaO
So, the correct answer is D. 2:1:1:1