Deck 1: HESI-A2-Chemistry

Question 1

Which of the following is the atomic number for the element francium?

A)88
B)223
C)87
D)348

Answer 1

87
The atomic number of francium (Fr) is 87, which represents the number of protons in the nucleus of an atom of Fr.
223 amu is the atomic mass of Fr.

Question 2

If necessary, use the periodic table to answer the following question. Click here to open the periodic table in a new tab
How many elements are in period 3 of the periodic table?

A)3
B)8
C)4
D)10

Answer 2

8
Periods are the rows of the periodic table and are numbered increasing from top to bottom.
Period 3 contains 8 elements: sodium, magnesium, aluminum, silicon, phosphorous, sulfur, chlorine, and argon.
The columns of the periodic table are called groups.
Click here to view the periodic table with the groups and periods labeled.

Question 3

What is 540 Kelvin in degrees Celsius?

A)266.85 °C
B)813.15°C
C)366.85 °C
D)713.15 °C

Answer 3

266.85 ^oC
The equation to convert from Kelvin to Celsius is °K = °C + 273.15
We can plug in the Kelvin value we are provided in the problem and solve:
540 = °C + 273.15
540 - 273.15 = °C + 273.15 - 273.15
266.85 = °C

Question 4

Which of the following particles has a negative charge?

A)Proton
B)Neutron
C)Electron
D)Positron

Question 5

Which of the following is the metric system's basic measure of distance?

A)inch
B)mile
C)kilometer
D)meter

Question 6

Which of the following is the SI unit used to measure the amount of a substance?

A)Kilogram
B)Mole
C)Gram
D)Meter

Question 7

Which metric prefix is represented numerically by 10^-3?

A)kilo-
B)milli-
C)centi-
D)deci-

Question 8

Which of the following numbers does the prefix "deka" represent?

A)10
B)0)01
C)100
D)1,000

Question 9

Which of the following options represents the SI base unit of mass?

A)Pound
B)Ounce
C)Kilogram
D)Gram

Question 10

Which of the following is the SI unit of length?

A)Inches
B)Kilometer
C)Meter
D)Feet

Question 11

What is the other name for the metric system?

A)The Imperial System
B)International System of Units
C)The Official Measurement System
D)The English System

Question 12

Which of the following Kelvin temperatures represents the freezing point of water?

A)0 K
B)273.15 K
C)373.15 K
D)-273.15 K

Question 13

What is 85^oC in degrees Fahrenheit.

A)155 °F
B)54 °F
C)185 °F
D)23 °F

Question 14

If a temperature were to decrease by 100 Kelvins, how much would this temperature decrease on the Celsius scale?

A)37 degrees Celsius
B)0 degrees Celsius
C)273 degrees Celsius
D)100 degrees Celsius

Question 15

On which of the following temperature scales can a negative number not exist?

A)Kelvin
B)Fahrenheit
C)Celsius
D)Joule

Question 16

Normal body temperature is considered to be 98.6^oF. What is the normal body temperature in degrees Celsius?

A)37° C
B)100° C
C)32° F
D)21° C

Question 17

Which of the following is correct?

A)273.15 Kelvin = 100 degrees Celsius
B)100 Kelvin = 0 degrees Celsius
C)0 Kelvin = -273.15 degrees Celsius
D)0 kelvin = 32 degrees Celsius

Question 18

Which of the following occurs at 100°C?

A)Ice melts
B)Pure water sublimes
C)Pure water boils
D)Pure water freezes

Question 19

What is 6,987,000 in scientific notation?

A)6)987 x 10⁶
B)0)6987 x 10⁷
C)6)987 x 10⁵
D)69.87 x 10⁵

Question 20

Which of the following options correctly shows 4,752,100 in scientific notation?

A)4)7521 x 10⁶
B)4)7521 x 10^-5
C)4)7521 x 10^-6
D)4)7521 x 10⁵

Question 21

What is 6.5 × 10^-5 equal to in standard form?

A)0)000065
B)650,000
C)0)00065
D)0)0065

Question 22

Which option correctly translates 5.67 × 10⁸ into standard form?

A)0)0000000567
B)56,700,000
C)567,000,000
D)5,670,000,000

Question 23

The mass of a grain of sand is 1.672 × 10^-4 kg. Express this number in standard notation.

A)0)0001672 kg
B)1,672 kg
C)0)00001672 kg
D)1,672,000 kg

Question 24

Which option correctly converts 4.51 × 10^-5 to standard notation?

A)0)0000451
B)0)00000451
C)4,510,000
D)4,510

Question 25

Which option is the correct scientific notation of 734,000,000?

A)7)34 x 10⁸
B)7)34 × 10^-8
C)7)34 × 10^-7
D)7)34 × 10⁷

Question 26

What are the three main components of a number that is expressed in scientific notation?

A)Mathematical sign, significand, and exponential
B)Exponential, logarithm, and mathematical sign
C)Significant digit, mathematical sign, and exponential
D)Mathematical sign, root, and exponential

Question 27

Use the periodic table to answer the following question, if needed.
What is the identity of an atom with 24 protons, 30 neutrons, and 24 electrons?

A)Vanadium
B)Chromium
C)Zinc
D)Xenon

Question 28

Which of the following isotopes of iron has 26 protons, 30 neutrons, and 26 electrons?

A)⁵⁵Fe
B)²⁶Fe
C)⁵⁶Fe
D)³⁰Fe

Question 29

How many neutrons are in germanium-62?

A)62
B)31
C)30
D)32

Question 30

How many electrons does a neutral atom of nitrogen have?

A)6
B)8
C)5
D)7

Question 31

What does the mass number of an atom represent?

A)Protons, electrons, and neutrons
B)Protons and neutrons
C)Protons and electrons
D)Protons

Question 32

Which of the following correctly defines the term isotope?

A)Atoms with the same number of neutrons and electrons, but a different number of protons.
B)Atoms that have the same number of protons and neutrons, but a different number of electrons.
C)Atoms with the same number of protons and electrons, but a different number of neutrons.
D)Atoms that have different numbers of neutrons, electrons, and protons.

Question 33

How many neutrons does ⁵⁸Cr have?

A)35
B)58
C)34
D)36

Question 34

Which element on the periodic table has 8 protons?

A)Carbon
B)Nitrogen
C)Boron
D)Oxygen

Question 35

Which element is located in both Group 2 and Period 4?

A)Barium
B)Magnesium
C)Potassium
D)Calcium

Question 36

Which of the following is located in Group 2 of the periodic table?

A)Barium
B)Hydrogen
C)Neon
D)Lithium

Question 37

Which of the following elements is a non-metal?

A)Lead
B)Zinc
C)Chlorine
D)Lithium

Question 38

Which of the following elements is located in period 2 of the periodic table?

A)Oxygen
B)Helium
C)Hydrogen
D)Magnesium

Question 39

Which of the following is the correct symbol for arsenic?

A)Ar
B)Al
C)At
D)As

Question 40

Which of the following elements is a metal?

A)Bromine
B)Strontium
C)Neon
D)Helium

Question 41

Elements in the modern periodic table are arranged by increasing what?

A)Number of electrons
B)Atomic number
C)Atomic mass
D)Atomic radius

Question 42

How many protons does the element xenon (Xe) have?

A)55
B)18
C)54
D)53

Question 43

Which of the following is a property of noble gases?

A)They have a full octet of valence electrons
B)They are highly reactive
C)They have a -1 charge
D)They are easily ionized

Question 44

Which of the following elements is a halogen?

A)Ne
B)H
C)Al
D)Cl

Question 45

Which of the following exists as a diatomic element?

A)Sodium
B)Chlorine
C)Xenon
D)Helium

Question 46

What does the atomic mass of an element represent?

A)The number of protons and neutrons in one atom
B)The average mass of all isotopes of that element
C)The number of protons in one atom
D)The number of protons, neutrons, and electrons in one atom

Question 47

Which of the following best describes an atom with a charge?

A)Ion
B)Isotope
C)Radiation
D)Compound

Question 48

Which of the following best describes a cation?

A)An atom that has more protons than electrons
B)An atom that has more electrons than protons
C)An atom with a negative charge
D)An atom that has more neutrons than protons

Question 49

Which subatomic particle has a positive charge?

A)Electrons
B)Protons
C)Photons
D)Neutrons

Question 50

An atom with 7 protons, 8 neutrons, and 10 electrons has which of the following charges?

A)0
B)-1
C)+3
D)-3

Question 51

What is the name given to a negatively-charged atom?

A)Anion
B)Cation
C)Isotope
D)Ion

Question 52

Which element does the electron configuration 1s² 2s² 2p⁴ represent?

A)Oxygen
B)Nitrogen
C)Fluorine
D)Carbon

Question 53

Which of the following is not a subatomic particle?

A)Neutron
B)Ion
C)Proton
D)Electron

Question 54

Which of the following represents the correct electron configuration for sodium (Na)?

A)1s² 2s² 2p⁶
B)2s¹ 2s²
C)2s² 2p⁶ 3s¹
D)1s² 2s² 2p⁶ 3s¹

Question 55

Which of the following orbits the nucleus of an atom?

A)Neutron
B)Electron
C)Proton
D)Gamma particle

Question 56

Which of the following best describes an ion?

A)A neutral atom
B)A charged atom
C)An atom that does not react
D)A pair of atoms with different mass numbers

Question 57

Which of the following is a true statement?

A)Electrons have a positive charge.
B)Electrons are located in the nucleus.
C)Neutrons orbit the nucleus.
D)Protons have a positive charge.

Question 58

H₂O is an example of which of the following:

A)Atom
B)Element
C)Sub-atomic particle
D)Compound

Question 59

Which of the following states of matter for a certain substance is generally the densest?

A)All are equally dense.
B)Solid
C)Liquid
D)Gas

Question 60

Which of the following states of matter take the shape of the container they are placed in?

A)Liquid and gas
B)Gas and solid
C)Liquid and solid
D)Gas, liquid, and solid

Question 61

Which of the following occurs when ice melts?

A)Water molecules lose kinetic energy.
B)Water molecules gain kinetic energy.
C)The kinetic energy of water molecules does not change.
D)None of these

Question 62

What is meant by the phrase "the equilibrium lies far to the right"?

A)The equilibrium greatly favors the products.
B)The reaction has gone to completion.
C)The equilibrium greatly favors the reactants.
D)The equilibrium has been destroyed.

Question 63

What generally happens to a reaction when the temperature increases?

A)Temperature generally has no effect on the rate of a reaction.
B)The reaction rate increases.
C)The reaction rate decreases.
D)A precipitate usually forms.

Question 64

Why does increasing the surface area of reactants or catalysts increase the rate of a reaction?

A)It introduces charges on the surface of the particles, which makes them more reactive.
B)It reduces the amount of precipitate that is formed during the reaction.
C)The activation energy of the reaction is lowered.
D)It increases the likelihood of molecules encountering one another.

Question 65

Which of the following best describes what occurs when an equilibrium is established in a reaction?'

A)The rate of the forward reaction is equal to the rate of the reverse reaction.
B)All reagents have been consumed.
C)The catalyst is fully consumed, terminating the reaction.
D)All products have precipitated from the solution.

Question 66

Which of the following describes a catalyst?

A)A substance that slows down a reaction.
B)A substance that increases the rate of a chemical reaction
C)A gas that evolves from the reaction
D)A solid that precipitates out of a reaction

Question 67

A chemist wants to make 5 L of a solution of NaCl that has a molarity of 0.5. How many moles of NaCl do they need?

A)1)25 moles
B)5)0 moles
C)2)5 moles
D)25 moles

Question 68

What is the molarity of an aqueous solution with 0.40 moles of sugar dissolved in 5 liters of water?

A)800.0 M
B)8)0 M
C)0)08 M
D)0)04 M

Question 69

Which of the following best describes a saturated solution?

A)An unstable solution where crystals form
B)A solution where more solute can dissolve
C)A solution where no more solute can dissolve
D)A solution that contains salt

Question 70

When brass is created by mixing zinc and copper, what type of solution is created?

A)Alloy
B)Compound
C)Liquid-liquid
D)Emulsion

Question 71

Which of the following is not an example of a solution?

A)Alloy
B)Emulsion
C)Unsaturated
D)Saturated

Question 72

Which state of matter can contain a solution?

A)Solids and liquids
B)Liquids and gases
C)Gases and solids
D)Solids, liquids, and gases

Question 73

Which of the following is the correct formula for sodium chloride?

A)SbCl
B)NaCl
C)SnCl
D)SrCl2

Question 74

What does a double arrow mean in a chemical reaction?

A)The reaction proceeds to completion
B)The reaction does not proceed
C)The reaction is reversible
D)A combustion reaction has occurred

Question 75

Which of the following is the correct term for chemicals on the left side of the reaction arrow?   

A)Equation
B)Products
C)Reactants
D)Ions

Question 76

In a chemical equation, what do (aq), (l), (g), and (s) represent?

A)Products
B)States of matter
C)Solubility of reactants
D)Reactants

Question 77

Which type of reaction below represents an acid-base reaction?

A)3 HBr + Al(OH)₃ → 3 H₂O + AlBr₃
B)2 NH₃ + H₂SO₄ → (NH₄)₂SO₄
C)MgCl₂ + Li₂CO₃ → MgCO₃ + 2 LiCl
D)2 NaBr + Ca(OH)₂ → CaBr₂ + 2 NaOH

Question 78

What type of reaction is shown below:
2C₅H₅ + Fe → Fe(C₅H₅)₂

A)Synthesis
B)Decomposition
C)Double displacement
D)Single displacement

Question 79

What is another term for a displacement reaction?

A)Decomposition
B)Metathesis
C)Combustion
D)Synthesis

Question 80

Which of the following shows a double displacement reaction?

A)Fe + Pb(NO₃)₂ → Pb + Fe(NO₃)₂
B)Fe + CuSO₄ → Cu + FeSO₄
C)CH₄ + 2O₂ → 2H₂O + CO₂
D)AgNO₃ + NaCl → AgCl + NaNO₃