what is the net charge of an ionic compound
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HESI A2

HESI A2 Chemistry Practice Questions

1. What is the net charge of an ionic compound?

Correct answer: A

Rationale: The correct answer is A: 0. Ionic compounds have a net charge of 0 because they are formed by the combination of positively charged ions (cations) and negatively charged ions (anions) in a way that neutralizes their charges. This balanced combination results in an electrically neutral compound. Therefore, the net charge of an ionic compound is typically 0. Choices B, C, and D are incorrect because ionic compounds are designed to have a total neutral charge, with the positive charges balancing out the negative charges.

2. In a local baseball team, 4 players, which represent 5% of the team, have long hair, and the rest have short hair. How many short-haired players are there on the team?

Correct answer: C

Rationale: Given that 4 players represent 5% of the team, let's denote the total number of players as x. The equation to represent this situation is 0.05x = 4. Solving for x, we get x = 80, which is the total number of players on the team. Since 4 players have long hair, the remaining players have short hair, which is 80 - 4 = 76. Therefore, there are 76 short-haired players on the team. Choices A, B, and D are incorrect as they do not consider the total number of players correctly, leading to inaccurate calculations.

3. Which phrase correctly completes the sentence? She went to the party ___ her dislike for the host.

Correct answer: D

Rationale: The correct phrase to complete the sentence is 'In spite of.' This phrase is used to indicate that an action is taken despite a particular circumstance or feeling. In this case, she went to the party in spite of her dislike for the host, meaning she attended the party regardless of her negative feelings towards the host. Choice A, 'Despite of,' is incorrect as the correct phrase is 'Despite,' without the preposition 'of.' Choice B, 'Even though,' is not the best fit in this context as it does not express the contrast between attending the party and disliking the host as effectively as 'In spite of.' Choice C, 'Although,' is also not the most suitable choice as it is used to introduce a contrast, but 'In spite of' provides a stronger emphasis on the contradiction between attending the party and disliking the host.

4. Which of the following is equivalent to 0.0009?

Correct answer: A

Rationale: The correct answer is A: 0.09%. To convert 0.0009 to a percentage, move the decimal point four places to the right and add a percentage sign. Therefore, 0.0009 is equal to 0.09%. Choice B (9%) is incorrect as it represents 0.09 without the decimal point adjustment. Choice C (0.01%) is incorrect as it represents 0.0009 with one less zero. Choice D (0.90%) is incorrect as it represents 0.9 not 0.0009.

5. Select the meaning of the underlined word in the following sentence. Quick action kept the disease from permeating the general population.

Correct answer: D

Rationale: In this context, the word 'permeating' indicates the process of spreading throughout or penetrating into. 'Infiltrating' is the most appropriate synonym for this meaning, as it captures the idea of the disease spreading into the general population. 'Conquering' (Choice A) means to overcome or defeat, which is not the meaning in this context. 'Wounding' (Choice B) means to cause injury, which is not relevant to the sentence. 'Deterring' (Choice C) means to discourage or prevent, which does not fit the context of the disease spreading.

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