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HESI CHEMISTRY PRACTICE QUESTIONS
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HESI CHEMISTRY PRACTICE QUESTIONS
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HESI CHEMISTRY PRACTICE QUESTIONSWhich of the following is not a polysaccharide? - Answers -Glucose
What percentage of an original sample of iodine-131 will remain after 64 days if iodine-
131 has a half-life of 8 days? - Answers -0.39 %
When ethylamine is added to water, it creates an alkaline solution. Which of option
below would best represent the pH of this solution? - Answers -11.9
Which of the following pairs would result in an acid-base neutralization reaction? -
Answers -KOH + H2SO4
Which of the following is correct? - Answers -0 Kelvin = -273.15 degrees Celsius
Which of the following is the SI unit of length? - Answers -meter
Normal body temperature is considered to be 98.6oF. What is the normal body
temperature in degrees Celsius? - Answers -37° C
What functional group do fatty acids contain? - Answers -Carboxylic acid
Which of the following is not a simple sugar? - Answers -Glycogen
F-21 has a half-life of 5 seconds. How long will it take a 50 g sample of F-21 to decay to
a mass of 12.5 g? - Answers -10s
Which of the following options correctly shows the products between the acid-base
reaction between NaOH and HCl? - Answers -NaCl + H2O
Which of the following represents a normal blood pH level? - Answers -7.40
Which of the following occurs during a redox reaction? - Answers -One species is
reduced, while another is oxidized
When methane (CH4) is heated in the presence of oxygen, water and CO2 are
produced. What type of reaction is this? - Answers -Combustion
Which of the following describes a decomposition reaction? - Answers -Chemicals are
broken apart to form products
Which intermolecular force is the strongest? - Answers -hydrogen bonds
What type of bonding exists in NaCl? - Answers -ionic
, When brass is created by mixing zinc and copper, what type of solution is created? -
Answers -Alloy
Which state of matter can contain a solution? - Answers -Solids, liquids, and gases
Which of the following describes a catalyst? - Answers -A substance that increases the
rate of a chemical reaction
Which of the following occurs when ice melts? - Answers -Water molecules gain kinetic
energy.
Which of the following isotopes of iron has 26 protons, 30 neutrons, and 26 electrons? -
Answers -56Fe
Which element on the periodic table has 8 protons? - Answers -Oxygen
Which of the following is the correct symbol for arsenic? - Answers -As
Which of the following is a property of noble gases? - Answers -They have a full octet of
valence electrons
What is the name given to a negatively-charged atom? - Answers -Anion
Which of the following does pH measure? - Answers -The concentration of hydrogen
ions
During oxidation, what happens to a chemical species? - Answers -It loses electrons
Which of the following shows a synthesis reaction? - Answers -A + B → AB
What atom property determines if a bond is polar or non-polar? - Answers -
Electronegativity
Which of the following describes a non-polar covalent bond? - Answers -An even
sharing of electrons between atoms
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? - Answers -2.5 moles
Which of the following is not an example of an alloy? - Answers -A mixture of bromine
and oxygen
Which of the following best describes what occurs when an equilibrium is established in
a reaction?' - Answers -The rate of the forward reaction is equal to the rate of the
reverse reaction.
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