HESI Chemistry Practice Test 1
What is the atomic number of an unknown element with 45 protons and an atomic mass of 64?
Correct answer: 45
The number of protons in an atom's nucleus is also the atom's atomic number. In this example, we are told that there are 45 protons present and that the atomic mass is 64; nevertheless, we do not require the atomic mass when looking for the atomic number. As a result, the atomic number is 45.
What is the sodium charge in the compound NaCl?
Correct answer: +1
The chemical interaction between sodium and chlorine is an ionic one, in which sodium transfers an electron to chlorine to form sodium chloride. The donation of one electron results in a charge of +1 for sodium and a charge of 1 for chlorine.
What is the number of monosaccharides in an oligosaccharide?
Correct answer: Three to six
Monosaccharides are made up of just one sugar unit.
Disaccharides are made up of two monosaccharides.
Oligosaccharides are made up of three to six monosaccharides.
Polysaccharides are made up of at least six monosaccharides.
An atom having an electrical charge is referred to as a(n):
Correct answer: Ion
An ion is an atom that has an electrical charge.
Which of the following does not represent a state of matter?
Correct answer: Lattice
Matter consists of 3 states: gases, liquids, and solids.
Citric acid is found in lemon juice. Which of the following pH levels is most likely for lemon juice?
Correct answer: 2
Because lemon juice includes an acid, its pH will most likely be acidic. The only acidic pH among the above possibilities is 2. Citric acid, in reality, has a pH of 2.2.
Which of the following causes cramps during strenuous exercise?
Correct answer: Lactate
Lactate, commonly known as lactic acid, is responsible for the burning or cramping sensation experienced after hard activity.
What do you call substances that cannot be broken down into simpler forms of matter?
Correct answer: Elements
An element is a material that cannot be broken down into simpler forms of matter.
What does -COOH mean?
Correct answer: Carboxyl group
A carbonyl and a hydroxyl group are linked to the same carbon atom in the carboxyl group.
In degrees Celsius, a typical human body temperature is
Correct answer: 37 degrees
Because the average human temperature ranges from 36.5 to 37.5 degrees Celsius, 37 degrees is the optimum response.
What is the usage of scientific notation?
Correct answer: The plan is to make it easier to deal with both tiny and large quantities.
Scientific notation helps us to more easily explain little and large numbers.
Unstable nuclei, given enough time, will:
Correct answer: decay into a stable form
Unstable nuclei will decay into stable nuclei given enough time.
If a specific reversible process reached equilibrium, what would happen if more reactants were added?
Correct answer: The equilibrium would change in favor of the formation of additional products.
According to LeChatlier's principle, every disruption to an equilibrium system causes the system to adapt itself to offset the effect of the disturbance.
What is the molarity of an aqueous solution containing 0.40 moles of sugar in 5 liters of water?
Correct answer: 0.08 M
Molarity is measured in mol/L units and is defined as moles of solute divided by liters of solution. Simply divide the number of moles by the amount in liters to obtain this answer: 0.40 mol/5 L equals 0.08 M
Which of the following states of matter has a definite volume?
Correct answer: Liquid and solid
A solid has a distinct form as well as volume.
A liquid has a fixed volume but no fixed form.
A gas has neither a fixed volume nor a fixed form.
What is the definition of freezing point?
Correct answer: Point at which a liquid turns to a solid
The freezing point at which a liquid transforms into a solid.
