Question

1. if the pressure of 100 cm³ of a sample of air is doubled at constant temperature, what would be its new volume? a. 250 cm³ b. 150 cm³ c. 200 cm³ d. 50 cm³ 50. if the hydrogen of a dibasic acid is partially replaced by a metal, it forms a. a neutral oxide. b. an acid salt. c. an amphoteric oxide. d. a salt.

Explanation:

Step1: Identify the gas - law

At constant temperature, Boyle's law applies, $P_1V_1 = P_2V_2$. Let the initial pressure be $P_1$, initial volume $V_1=100\ cm^3$, and the new pressure $P_2 = 2P_1$.

Step2: Substitute values into the formula

Substitute into $P_1V_1 = P_2V_2$, we get $P_1\times100=2P_1\times V_2$.

Step3: Solve for $V_2$

Divide both sides of the equation $P_1\times100 = 2P_1\times V_2$ by $2P_1$. Since $P_1
eq0$, we have $V_2=\frac{100}{2}=50\ cm^3$.

A dibasic acid has two replaceable hydrogen atoms. When only some of the hydrogen atoms are replaced by a metal, an acid - salt is formed. For example, in $H_2SO_4$, when one hydrogen is replaced by sodium, $NaHSO_4$ (sodium bisulfate), an acid - salt, is formed.

Answer:

D. $50\ cm^3$