Question

question 18 (0.0862 points)
how many neutrons are in cl-37?
17
37
35.35
20
question 19 (0.0862 points)
the solubility of gases in water:
increases with increase pressure
decreases with decrease pressure
decreases with increase temperature
all of these are true

Explanation:

Question 18

Step1: Recall neutron calculation formula

The number of neutrons in an atom is calculated by the formula: \( \text{Number of neutrons} = \text{Mass number} - \text{Atomic number} \). For chlorine (Cl), the atomic number (number of protons) is 17. The mass number of Cl - 37 is 37.

Step2: Calculate the number of neutrons

Substitute the values into the formula: \( 37 - 17 = 20 \).

• For gas solubility in water: According to Henry's law, solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid (so solubility increases with increase in pressure and decreases with decrease in pressure). Also, the solubility of most gases in water decreases as temperature increases (gases are less soluble at higher temperatures). So all the given statements about gas solubility in water are true.

Answer:

20

Question 19