Matter Interactions Unit Test
11 of 1311 of 13 Items
Question
Use the unbalanced chemical equation to answer the question.
2NaHCO3 → Na2CO3 + CO2
Which of the following can be added to the products to balance the equation?
(1 point)
Responses
H2O
No, H2O cannot be added to balance the equation because it is not part of the equation and would not react with any of the substances in the equation.
Matter Interactions Unit Test
11 of 1311 of 13 Items
Question
Use the unbalanced chemical equation to answer the question.
2NaHCO3 → Na2CO3 + CO2
Which of the following can be added to the products to balance the equation?
(1 point)
Responses
H2O
H 2 O
O2
O 2
H2
H 2
CH2OH
CH 2 OH
Skip to navigation
H2O can be added to the products to balance the equation.
The image is a model of sulfuric acid that has a chemical formula of H2SO4. In 1-2 sentences, explain why creating models, like the one shown in the image above, is important in understanding substances.
(2 points)
Creating models is important in understanding substances because they provide a visual representation that helps us visualize the structure, composition, and arrangement of atoms in the substance, making it easier to comprehend its properties and behavior.
To balance the given chemical equation 2NaHCO3 → Na2CO3 + CO2, we need to add the appropriate coefficients in front of each molecule or compound to make sure that the number of atoms on both sides of the equation is equal.
In this case, we can see that there are 2 sodium atoms (Na) on the left side, but only 1 sodium atom (Na) on the right side. To balance this, we can add the coefficient 2 in front of Na2CO3:
2NaHCO3 → 2Na2CO3 + CO2
Now, there are 4 hydrogen atoms (H) on the left side, but only 2 hydrogen atoms (H) on the right side. To balance this, we can add the coefficient 4 in front of H2O:
2NaHCO3 → 2Na2CO3 + CO2 + 4H2O
Therefore, the correct answer is H2O, which can be added to the products to balance the equation.
To balance a chemical equation, you need to make sure that the number of atoms on each side of the equation is the same. In this case, we have 2 sodium bicarbonate (NaHCO3) molecules on the left side of the equation but only 1 sodium carbonate (Na2CO3) molecule on the right side.
To balance the equation, you need to add a coefficient in front of the Na2CO3 molecule, which represents the number of molecules involved. In this case, you can add a coefficient of 2 to balance the sodium atoms on both sides of the equation.
2NaHCO3 → 2Na2CO3 + CO2
Now, let's check the options. The question asks which of the following can be added to the products to balance the equation, so we're looking for a substance that can be added to the right side.
Among the options provided, H2O is the only choice. By adding water (H2O) to the right side, you can balance the number of oxygen atoms. Since there are three oxygen atoms in the reactant (2 in NaHCO3 and 1 in CO2), you can add 3 H2O molecules to the right side to balance it.
2NaHCO3 → 2Na2CO3 + 3H2O + CO2
Therefore, the correct answer is H2O.