2026 HESI A2 Chemistry Practice Test (40 Questions And Complete Answers)
1 / 39
Terms in this set
39
An unknown element is found to contain 45 protons and an atomic mass of 64, what is its atomic number?
1. It cannot be determined
2. 19
3. 45
4. 64
1. It cannot be determined
2. 19
3. 45
4. 64
45
Elements that are in the same column of the periodic table are in the same
1. period
2. group
3. row
4. classification
1. period
2. group
3. row
4. classification
group
What is the purpose of scientific notation?
1. There is no purpose
2. The purpose is to handle bigger numbers more easily
3. The purpose is to handle smaller numbers more easily
4. The purpose is to handle both smaller and bigger numbers more easily
1. There is no purpose
2. The purpose is to handle bigger numbers more easily
3. The purpose is to handle smaller numbers more easily
4. The purpose is to handle both smaller and bigger numbers more easily
The purpose is to handle both smaller and bigger numbers more easily
What is the metric prefix meaning one billionth?
1. Nano
2. Milli
3. Micro
4. Pico
1. Nano
2. Milli
3. Micro
4. Pico
Nano
A normal human body temperature in Celsius is:
1. 32 degrees
2. 35 degrees
3. 37 degrees
4. 39 degrees.
1. 32 degrees
2. 35 degrees
3. 37 degrees
4. 39 degrees.
37 degrees
Which of the following statements about atoms is false?
1. Electrons do not orbit an atom’s nucleus; they exist in electron clouds surrounding the nucleus
2. As each orbital of an atom is filled to capacity, electrons begin occupying a higher energy orbital
3. Most of the volume of an atom is empty space
4. Atoms are most stable when their outer electron shell (valence shell) is incomplete.
1. Electrons do not orbit an atom’s nucleus; they exist in electron clouds surrounding the nucleus
2. As each orbital of an atom is filled to capacity, electrons begin occupying a higher energy orbital
3. Most of the volume of an atom is empty space
4. Atoms are most stable when their outer electron shell (valence shell) is incomplete.
Atoms are most stable when their outer electron shell (valence shell) is incomplete.
What are isotopes?
1. Elements which have the same number of protons but a different number of neutrons
2. Elements with the same atomic number but different atomic mass numbers
3. Elements which have a different number of protons than electrons
4. Both A and B are correct.
1. Elements which have the same number of protons but a different number of neutrons
2. Elements with the same atomic number but different atomic mass numbers
3. Elements which have a different number of protons than electrons
4. Both A and B are correct.
Both A and B are correct.
What is the charge on sodium in the compound NaCl ?
1. −1
2. 0
3. +1
4. +2
1. −1
2. 0
3. +1
4. +2
+1
A student is observing a chemical reaction occurring with visible bubbling. The bubbling eventually stops. The student can see that some of the original reactants are still intact inside the beaker, so he knows that not all the reactant has been used up. Therefore, the student knows he is now observing
1. A failed reaction
2. Equilibrium
3. A decrease in temperature
4. A completed reaction
1. A failed reaction
2. Equilibrium
3. A decrease in temperature
4. A completed reaction
Equilibrium
Which of the following is the atomic mass of an atom containing 31 protons 31 electrons and 37 neutrons?
1. 62
2. 68
3. 70
4. 99
1. 62
2. 68
3. 70
4. 99
68
Showing the first 10 terms. Use the flashcard player above to study all 39 terms!