CHM 1142 Chapter 3 Quiz 1

Question 1: Balance this equation by providing the missing coefficients:

$\underline{\hspace{1cm}} \text{CaCO}_3(s) + \underline{\hspace{1cm}} \text{HCl}(aq) \rightarrow \underline{\hspace{1cm}} \text{CaCl}_2(aq) + \underline{\hspace{1cm}} \text{CO}_2(g) + \underline{\hspace{1cm}} \text{H}_2\text{O}(l)$

Question 2: Balance this equation by providing the missing coefficients:

$\underline{\hspace{1cm}} \text{Al}(s) + \underline{\hspace{1cm}} \text{HCl}(aq) \rightarrow \underline{\hspace{1cm}} \text{AlCl}_3(aq) + \underline{\hspace{1cm}} \text{H}_2(g)$

Question 3: The white spheres are hydrogen atoms and the blue spheres are nitrogen atoms. The two reactants combine to form ammonia, $\text{NH}_3$.

How many $\text{NH}_3$ molecules should be shown as the product?
A. 2
B. 4
C. 6
D. 9

Question 4: The white spheres are hydrogen atoms and the blue spheres are nitrogen atoms. The two reactants combine to form ammonia, $\text{NH}_3$. Write a balanced chemical equation for the reaction.

Question 5: Balance this equation by providing the missing coefficients:

$\underline{\hspace{1cm}} \text{Fe}(s) + \underline{\hspace{1cm}} \text{O}_2(g) \rightarrow \underline{\hspace{1cm}} \text{Fe}_2\text{O}_3(s)$

Question 6: The white spheres are hydrogen atoms, the black spheres are carbon atoms, and the red spheres are oxygen atoms. Write a balanced chemical equation for the reaction.

Question 7: Determine the number of $\text{O}_2$ molecules that should be shown in the left (reactants) box.

A. 9
B. 12
C. 18
D. 32

Question 8: The unbalanced equation for the reaction between methane and bromine is:

$\underline{\hspace{1cm}} \text{CH}_4(g) + \underline{\hspace{1cm}} \text{Br}_2(l) \rightarrow \underline{\hspace{1cm}} \text{CBr}_4(s) + \underline{\hspace{1cm}} \text{HBr}(g)$

Once this equation is balanced what is the value of the coefficient in front of bromine $\text{Br}_2$?