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HESI Practice Test 1 Chemistry

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Practice Test 1 (Diagnostic)
HESI Practice Test 1 Chemistry

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Question 1 of 25

1. Question

Which of the following reasons must researchers consider the placebo effect?

Monitor the outcome of the experiment
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Ensure a proper independent variable is chosen
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Account for the body’s response to fake treatments
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Create a baseline measure for experimental analysis
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Question 2 of 25

2. Question

Which of the following steps of the scientific method relies on logic reasoning to be formulated?

Asking a question
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Writing a conclusion
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Researching information
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Developing a hypothesis
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Question 3 of 25

3. Question

Which of the following terms is used interchangeably with negative variation?

Non-correlation
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Direct correlation
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Inverse correlation
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Positive correlation
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Question 4 of 25

4. Question

Look at the following image. Which of the following measuring tools are used?

Ruler, barometer
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Graduated cylinder, ruler
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Barometer, thermometer
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Thermometer, graduated cylinder
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Question 5 of 25

5. Question

Light travels at a speed of almost 3 × 10⁵ kilometers per second. How is this value written in standard notation?

0.000003 km/s
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0.00003 km/s
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30,000 km/s
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300,000 km/s
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Question 6 of 25

6. Question

Which of the following statements describes the mass of an electron?

The mass of an electron is less than the mass of a proton or neutron.
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The mass of an electron is about the same as the mass of a proton or neutron.
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The mass of an electron is greater than that of a neutron but less than that of a proton.
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The mass of an electron is greater than that of a proton but less than that of a neutron.
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Question 7 of 25

7. Question

Which of the following parts of an atom takes up the most space in terms of area?

Neutrons
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Electron cloud
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Individual electrons
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Protons and neutrons
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Question 8 of 25

8. Question

A neutral atom of aluminum has 13 electrons. How many electrons can be found in each shell in the electron cloud?

6 in the first shell, 7 in the second shell
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2 in the first shell, 11 in the second shell
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2 in the first shell, 8 in the second shell, 3 in the third shell
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3 in the first shell, 5 in the second shell, 5 in the third shell
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Question 9 of 25

9. Question

Which of the following is part of the metric system?

Celsius
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Feet
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Ounces
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Pound
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Question 10 of 25

10. Question

Which of the following is the Celsius value for 85K?

−145
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−188
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−205
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−358
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Question 11 of 25

11. Question

A patient has a fever of 105°C. Which of the following is this value in Fahrenheit?

137
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157
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189
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221
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Question 12 of 25

12. Question

What is the temperature of 35°C in Kelvin?

220
Correct Incorrect Correct answer

238
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308
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345
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Question 13 of 25

13. Question

Given the heating curve of iron, what are the approximate melting and boiling points?

900°C, 2300°C
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1500°C, 2900°C
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2300°C, 3100°C
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2900°C, 3400°C
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Question 14 of 25

14. Question

Compare the boiling points of the alcohols in the table below. Molecules of these alcohols are similar, but they have different numbers of carbon atoms in a chain and, therefore, different masses. Based on the boiling point data in the table, what conclusion can be drawn about the relationship between the number of carbon atoms in a molecule and the interaction of the molecules?

A higher number of carbon atoms makes it more difficult for particles to stick together.
Correct Incorrect Correct answer

As the number of carbon atoms increases, the intermolecular forces between the particles get weaker.
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A higher number of carbon atoms makes it easier for particles to spread out and move away from each other.
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As the number of carbon atoms increases, the strength of the intermolecular forces between the particles increases.
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Question 15 of 25

15. Question

A student is recording the temperature of a solid substance as he heats it over a Bunsen burner and notices that the temperature stays constant at 62°C for four minutes. How can the substance be described during these four minutes?

It is boiling.
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It is melting.
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It is entirely in the solid state.
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It is entirely in the liquid state.
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Question 16 of 25

16. Question

Flammability is an example of a _____.

polar substance
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weak substance
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physical property
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chemical property
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Question 17 of 25

17. Question

The process of diffusion of water molecules through a membrane in the direction of higher solute concentration describes which of the following?

Melting
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Osmosis
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Polarity
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Sublimation
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Question 18 of 25

18. Question

In the Lewis structure for carbon dioxide shown below, how many electrons is the carbon atom sharing with one oxygen atom?

2
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4
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5
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6
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Question 19 of 25

19. Question

Consider the carbon-carbon bonds that exist in the molecules shown below.

Which of the compounds below contains the strongest carbon-carbon bond?

Acetylene
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Ethane
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Ethylene
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Methanol
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Question 20 of 25

20. Question

According to the Lewis structure below, what is the formula for methanol?

CHO
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CH₃O
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CH₄O
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C₃HO
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Question 21 of 25

21. Question

In which reaction are both the reactants and the products heterogeneous mixtures?

2H₂O(g) → H₂(g) + O₂(g)
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2C₂H₂(g) + 5O₂(g) → 4CO₂(g) + 2H₂O(g)
Correct Incorrect Correct answer

2AgNO₃(aq) + Cu(s) → 2Ag(s) + Cu(NO₃)₂(aq)
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CaCl₂(aq) + MgSO₄(aq) → CaSO₄(s) + MgCl₂(aq)
Correct Incorrect Correct answer

Correct

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Question 22 of 25

22. Question

In the following single-replacement reaction, ______ replaces ______.

Cl₂ + 2NaI → 2NaCl + I₂

sodium, iodine
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chlorine, iodine
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chlorine, sodium
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sodium, chlorine
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Question 23 of 25

23. Question

What solution has a pH of 7?

Aniline
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Pyridine
Correct Incorrect Correct answer

Pure water
Correct Incorrect Correct answer

Sodium hydroxide
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Correct

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Question 24 of 25

24. Question

An acid that dissociates into hydrogen ions is defined as which of the following?

weak acid.
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Arrhenuis acid.
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conjugate acid.
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Br𝜙nsted-Lowry acid.
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Question 25 of 25

25. Question

What is the conjugate base of sulfuric acid?

HSO₄⁻
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HSO₂⁻
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HSO₃
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H₂SO₃
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HESI Practice Test 1 Chemistry

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