here are the solubilities of four substances at 0c in grams of solute per 100 ml of water if the temperature increases to 20c what would you expect to

HESI A2

HESI A2 Chemistry

1. Here are the solubilities of four substances at 0°C, in grams of solute per 100 mL of water. If the temperature increases to 20°C, what would you expect to happen to the solubility figures?

A. Citric acid and potassium phosphate will decrease; nitrogen and oxygen will increase.
B. Citric acid and potassium phosphate will increase; nitrogen and oxygen will decrease.
C. All four figures will increase.
D. All four figures will decrease.

Correct answer: C

Rationale: Solubility generally tends to increase with temperature for most solid solutes in liquid solvents due to higher kinetic energy leading to better solute-solvent interactions. As the temperature increases from 0°C to 20°C, all four solubility figures are expected to increase. Choice A is incorrect because solubility tends to increase with temperature. Choice B is incorrect as well for the same reason. Choice D is incorrect because the solubility of solid solutes typically increases with temperature.

2. What does Debilitating mean?

A. Incapacitating
B. Weakening
C. Empowering
D. Strengthening

Correct answer: A

Rationale: The correct answer is A: 'Incapacitating.' Debilitating means causing incapacity or weakness, making choice A the most appropriate. Choices B, C, and D are incorrect because they represent the opposite of what debilitating means. Weakening (choice B), Empowering (choice C), and Strengthening (choice D) all convey a sense of increasing strength or ability, which is the opposite of the meaning of debilitating.

3. The physician ordered 20 mg of Tylenol per kg of body weight; on hand is 80 mg per tablet. The child weighs 44 lb. How many tablets will you give?

A. 5 tablets
B. 5.5 tablets
C. 4.5 tablets
D. 3 tablets

Correct answer: A

Rationale: First, convert the child's weight from pounds to kilograms: 44 lb ÷ 2.2 = 20 kg. Next, calculate the required dosage: 20 kg × 20 mg/kg = 400 mg. Since each tablet contains 80 mg, divide the total dosage by the dosage per tablet: 400 mg ÷ 80 mg/tablet = 5 tablets. Therefore, the correct answer is 5 tablets. Choice B is incorrect because it does not account for the actual number of tablets needed. Choice C is incorrect as it is an underestimation of the required tablets. Choice D is incorrect as it is an underestimation of the required tablets.

4. What percentage of her income is left after Mary spent 15%?

A. 12%
B. 85%
C. 75%
D. 95%

Correct answer: B

Rationale: To determine the percentage of income remaining after spending 15%, subtract the percentage spent from 100% (100% - 15% = 85%). Therefore, Mary has 85% of her income left, which aligns with answer choice B. Choice A (12%) is incorrect because it represents the remaining amount after spending 88% of her income. Choice C (75%) is incorrect as it does not account for the 15% already spent. Choice D (95%) is incorrect as it does not consider the amount spent by Mary.

5. What is the meaning of Contrite?

A. Guilty
B. Regretful
C. Shameful
D. Pleased

Correct answer: B

Rationale: The correct answer is B: 'Regretful.' Contrite means feeling regret or remorse. 'Guilty' (A) refers to being responsible for a wrongdoing, not necessarily feeling remorseful. 'Shameful' (C) means feeling ashamed, which is related but not the same as feeling regret. 'Pleased' (D) means feeling satisfied or happy, which is the opposite of contrite.