Question

question 51 (0.0862 points)
group ia elements are also called
○ halogens
○ noble gases
○ alkaline earth metals
○ alkali metals
question 52 (0.0862 points)
what is the correct formula for ammonium hydrogen carbonate?
○ $\ce{nh4co3}$
○ $\ce{(nh4)2co3}$
○ $\ce{nh4co4}$
○ $\ce{nh4hco3}$

Explanation:

Question 51

Group IA elements (Li, Na, K, etc.) are known as alkali metals. Halogens are Group 17, noble gases are Group 18, and alkaline earth metals are Group 2.

Step1: Identify ions

Ammonium ion is $\text{NH}_4^+$, hydrogen carbonate (bicarbonate) ion is $\text{HCO}_3^-$.

Step2: Balance charges

The charge of $\text{NH}_4^+$ is +1, and $\text{HCO}_3^-$ is -1. So, one of each ion balances the charge.

Step3: Write formula

Combine the ions: $\text{NH}_4\text{HCO}_3$.

Answer:

D. alkali metals

Question 52