HESI A2 Practice Test 3 Chemistry

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  • 1/25 Questions

    A researcher notices a positive correlation between the height of a plant and nutrient concentration over time. Based on this observation, what conclusion does he reach?

    • The height of a plant increases in the absence and presence of the nutrients.
    • When the amount of nutrients available to the plant decreases, its height increases.
    • The amount of nutrients available to a plant is independent of how tall the plant gets.
    • When the amount of nutrients available to the plant increases, its height also increases.
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HESI A2 Practice Test 3 Chemistry - Quiz

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  • 2. 

    What metric base unit is used to record mass?

    • Celsius

    • Gram

    • Meter

    • Volume

    Correct Answer
    A. Gram
    Explanation
    B. Gram is the metric base unit for mass. See Lesson: Designing an Experiment.

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  • 3. 

    Which of the following numbers has the smallest magnitude?

    • 5.14 x 10-27

    • 4.65 x 10-19

    • 2.87 x 10-16

    • 5.29 x 10-7

    Correct Answer
    A. 5.14 x 10-27
    Explanation
    A. All choices are written in scientific notation and have negative exponents, which means the decimal place moves to the left when converting to standard notation. Because its decimal place moves to the left more spaces than the others, answer A has the smallest magnitude. See Lesson: Scientific Notation.

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  • 4. 

    What is 189°C in Kelvin?

    • 0.692

    • 84

    • 271

    • 462

    Correct Answer
    A. 462
    Explanation
    D. Celsius can be converted to Kelvin by adding 273 to the Celsius value. In this case, 273 added to 189°C yields 462 K. See Lesson: Temperature and the Metric System.

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  • 5. 
    Out of the elements present in the Lewis structures below, which one has the greatest number of shared electrons? Consider only single atoms of each element. - ProProfs

    Out of the elements present in the Lewis structures below, which one has the greatest number of shared electrons? Consider only single atoms of each element.

    • Chlorine

    • Oxygen

    • Phosphorus

    • Silicon

    Correct Answer
    A. Silicon
    Explanation
    D. Silicon shares eight electrons, which is more than any of the others share. Phosphorus shares six electrons, oxygen shares four electrons, and each chlorine atom shares two electrons. See Lesson: Chemical Bonds.

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  • 6. 

    Some _____ properties of matter are color, solubility, mass, odor, hardness, density, and boiling point.

    • biological

    • chemical

    • physical

    • reactive

    Correct Answer
    A. physical
    Explanation
    C. None of the properties listed indicate a chemical change, so they are physical properties. See Lesson: Properties of Matter.

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  • 7. 

    The Celsius temperature scale

    • belongs to the English system.

    • can be converted to Kelvin using 273.

    • begins with 32°C as water’s boiling point.

    • is recognized as one of five temperature scales.

    Correct Answer
    A. can be converted to Kelvin using 273.
    Explanation
    B. Celsius is one of three temperature scales and the only one that belongs to the metric system. It can be converted to Kelvin using 273. See Lesson: Temperature and the Metric System.

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  • 8. 
    The graph below shows the energy of the species involved in a chemical reaction as the reaction proceeds. Which of the following has the lowest amount of energy? - ProProfs

    The graph below shows the energy of the species involved in a chemical reaction as the reaction proceeds. Which of the following has the lowest amount of energy?

    • The products

    • The reactants

    • The transition state

    • The activated complex

    Correct Answer
    A. The products
    Explanation
    A. The products are present at the end of the reaction (C + D). The relative energy of these products is 20 kJ, which is lower than all other species in the reaction. See Lesson: Chemical Solutions.

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  • 9. 

    Two silicon atoms have a length of 1 nanometer, which is equal to 1 × 10-9 meter. When this value is represented in standard notation, how many zeros are between the decimal point and the nearest non-zero digit?

    • 7

    • 8

    • 9

    • 10

    Correct Answer
    A. 8
    Explanation
    B. Because the exponent is negative, the decimal point moves to the left when converting to standard notation. After moving one space, it is on the other side of the 1. It moves eight more spaces to the left, and the spaces are filled in with zeros. See Lesson: Scientific Notation.

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  • 10. 

    The compound silver sulfide has the formula Ag2S. Which of the following best describes the meaning of the subscript 2 in the formula?

    • The silver ion has a charge of -2.

    • The silver ion has a charge of +2.

    • There are two silver ions for every one sulfide ion.

    • There are two sulfide ions for every one silver ion.

    Correct Answer
    A. There are two silver ions for every one sulfide ion.
    Explanation
    C. Because the 2 comes after the symbol for silver (Ag), it shows how many silver atoms are in one particle of the compound. See Lesson: Chemical Bonds.

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  • 11. 

    A fish in a large fish tank is fed 5 ounces of food once a day. The same type of fish in a second tank is fed 10 ounces of food each day. The same type of fish in a third tank is fed 2 ounces of food four times a day. This study lasts for a four-week period where fish weight is measured weekly. What is the dependent variable?

    • Weight of the fish

    • Type of food used

    • Number of fish tanks

    • Frequency of feedings

    Correct Answer
    A. Weight of the fish
    Explanation
    A. The weight of fish is the dependent variable because it is dependent on how much food is supplied to each fish tank over the four-week period. See Lesson: Designing an Experiment.

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  • 12. 
    Given the cooling curve below, what is the melting point of titanium? - ProProfs

    Given the cooling curve below, what is the melting point of titanium?

    • 500°C

    • 1500°C

    • 1700°C

    • 3300°C

    Correct Answer
    A. 1700°C
    Explanation
    C. In the cooling curve, the melting point is where the second plateau in temperature occurs, which is around 1700°C. See Lesson: States of Matter.

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  • 13. 

    Which ions from a base react with hydrogen ions in a neutralization reaction?

    • CH3+

    • OH-

    • H3O+

    • COOH-

    Correct Answer
    A. OH-
    Explanation
    B. When hydroxide ions (OH-) from a base react with hydrogen ions from an acid, both water and salt are formed. See Lesson: Acids and Bases.

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  • 14. 

    A stick of butter is melted in a dish in the microwave. After it melts, which of the following statements describes the butter?

    • It has both the shape and volume of the dish.

    • It has the shape but not the volume of the dish.

    • It has the volume but not the shape of the dish.

    • It has neither the shape nor the volume of the dish.

    Correct Answer
    A. It has the shape but not the volume of the dish.
    Explanation
    B. As the butter melts, it goes from a solid to a liquid, which takes the shape but not the volume of its container. See Lesson: States of Matter.

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  • 15. 

    What is the Celsius value for 350°F?

    • 162

    • 177

    • 194

    • 398

    Correct Answer
    A. 177
  • 16. 
    The graph below shows the energy of the species involved in a chemical reaction as the reaction proceeds. How much energy is released in this reaction? - ProProfs

    The graph below shows the energy of the species involved in a chemical reaction as the reaction proceeds. How much energy is released in this reaction?

    • 10 kJ

    • 20 kJ

    • 30 kJ

    • 40 kJ

    Correct Answer
    A. 10 kJ
    Explanation
    A. The amount of energy released is the difference in energy between the reactants and the products. Overall, the reactants released 10 kJ to get from 30 kJ to 20 kJ in the products. See Lesson: Chemical Solutions.

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  • 17. 

    Which of the following pairs of elements contains two elements in the same group?

    • Iron and cobalt

    • Fluorine and bromine

    • Hydrogen and helium

    • Sodium and magnesium

    Correct Answer
    A. Fluorine and bromine
    Explanation
    B. Fluorine and bromine are the only pair located in the same group (column) of the periodic table, group 17. See Lesson: Scientific Notation.

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  • 18. 

    What product is formed when acetic acid (CH3COOH) reacts with water?

    • H2

    • OH-

    • CH3COO-

    • CH3COOH

    Correct Answer
    A. CH3COO-
    Explanation
    C. When acetic acid dissolves in water, it forms an aqueous solution that contains hydronium ions and acetate ions (CH3COO-). See Lesson: Acids and Bases.

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  • 19. 

    What metric prefix has a multiplying factor of 106?

    • Deci-

    • Deca-

    • Mega-

    • Micro-

    Correct Answer
    A. Mega-
    Explanation
    C. In the metric system, the multiplying factor of 106 corresponds to a metric prefix of mega-. This means there are 1,000,000 grams in one megagram. See Lesson: Temperature and the Metric System.

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  • 20. 

    How do silicon and oxygen form a chemical bond?

    • Silicon and oxygen will share electrons.

    • Oxygen will transfer electrons to silicon.

    • Silicon will transfer electrons to oxygen.

    • Oxygen and silicon cannot form chemical bonds together.

    Correct Answer
    A. Silicon and oxygen will share electrons.
    Explanation
    A. Because silicon and oxygen are both nonmetals, they will share electrons, forming a covalent bond. See Lesson: Chemical Bonds.

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  • 21. 

    A researcher wants to determine the impact of sunlight on plant growth. Which measuring tool should she use?

    • Clock

    • Barometer

    • Thermometer

    • Triple beam balance

    Correct Answer
    A. Thermometer
    Explanation
    C. Because the researcher is studying the effects of sunlight on plant growth and sunlight radiates heat to the plant, she should use a thermometer to measure temperature. See Lesson: Designing an Experiment.

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  • 22. 

    Which of the following elements is in the same family as calcium?

    • Potassium

    • Scandium

    • Strontium

    • Yttrium

    Correct Answer
    A. Strontium
    Explanation
    C. Families in the periodic table are associated with groups (columns). Strontium is the only element listed that is in group 2 with calcium. See Lesson: Scientific Notation.

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  • 23. 

    Properties that do not depend on the amount of matter that is present are _____ properties.

    • chemical

    • extensive

    • intensive

    • physical

    Correct Answer
    A. intensive
    Explanation
    C. Intensive properties do not depend on the amount of matter that is present. See Lesson: Properties of Matter.

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  • 24. 
    Given the cooling curve below, what state(s) of matter were present between 20 and 30 minutes? - ProProfs

    Given the cooling curve below, what state(s) of matter were present between 20 and 30 minutes?

    • Solid only

    • Liquid only

    • Liquid and gas

    • Solid and liquid

    Correct Answer
    A. Solid and liquid
    Explanation
    D. Between 20 and 30 minutes, the temperature is constant, which means there is a phase change occurring. Since this is the second phase change of a cooling curve, the substance must be freezing. Therefore, the sample is a mixture of solid and liquid. See Lesson: States of Matter.

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  • 25. 

    What happens to a Brønsted-Lowry base in an aqueous solution?

    • Donates hydrogen ions

    • Accepts a pair of electrons

    • Dissociates to hydronium ions

    • Increases hydroxide ion concentration

    Correct Answer
    A. Increases hydroxide ion concentration
    Explanation
    D. When a Brønsted-Lowry base dissociates in an aqueous solution, it accepts hydrogen ions and increases hydroxide ion concentration. See Lesson: Acids and Bases.

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  • Apr 10, 2019
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