ATI Chemistry Practice Test 2 — Questions and Answers
Question 1: What is the pH of a solution with a hydrogen ion concentration of 1 x 10^-4 M?
- 4 (Correct answer)
- 10
- -4
- 14
Correct answer: 4
pH equals the negative log of [H+], so -log(1x10^-4) = 4.
Question 2: Which type of bond forms when electrons are transferred from a metal to a nonmetal?
- Ionic (Correct answer)
- Covalent
- Hydrogen
- Metallic
Correct answer: Ionic
Ionic bonds form when electrons transfer from a metal to a nonmetal, creating charged ions.
Question 3: What is the atomic number of an element determined by?
- Number of protons (Correct answer)
- Number of neutrons
- Number of electrons plus neutrons
- Atomic mass
Correct answer: Number of protons
The atomic number equals the number of protons in an atom's nucleus.
Question 4: A solution with a pH of 9 is best described as:
- Basic (Correct answer)
- Acidic
- Neutral
- Saturated
Correct answer: Basic
A pH above 7 indicates a basic (alkaline) solution.
Question 5: Which subatomic particle has a negative charge?
- Electron (Correct answer)
- Proton
- Neutron
- Nucleus
Correct answer: Electron
Electrons carry a negative charge and orbit the nucleus.
Question 6: What is the name of the process by which a solid changes directly into a gas?
- Sublimation (Correct answer)
- Evaporation
- Condensation
- Melting
Correct answer: Sublimation
Sublimation is the direct transition of a solid to a gas without becoming liquid.
Question 7: In the formula H2O, the subscript 2 indicates:
- Two hydrogen atoms (Correct answer)
- Two water molecules
- Two oxygen atoms
- A charge of +2
Correct answer: Two hydrogen atoms
The subscript 2 shows there are two hydrogen atoms in each water molecule.
ATI Chemistry Practice Test 2
What is the pH of a solution with a hydrogen ion concentration of 1 x 10^-4 M?