Test Prep / CustomExam Practice Test - 11/3/2025

CustomExam Practice Test - 11/3/2025

Practice test covering 10 questions in 20 minutes. All questions are multiple-choice.

The CustomExam Practice Test - 11/3/2025 is designed to help students practice with exam-style questions and improve their test-taking skills. This practice test covers 10 questions in 20 minutes, allowing learners to experience the format and timing of real assessments while identifying areas that need further review.

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1

In which state of matter are particles tightly packed and vibrate in fixed positions?

A:Solid
B:Liquid
C:Gas
D:Plasma
2

What kind of bond results from the electrostatic attraction between oppositely charged ions?

A:Ionic Bond
B:Covalent Bond
C:Metallic Bond
D:Hydrogen Bond
3

What is the difference in the percentage of nitrogen and oxygen in dry air?

A:Nitrogen: 78%, Oxygen: 21%
B:Nitrogen: 21%, Oxygen: 78%
C:Nitrogen: 78%, Oxygen: 20%
D:Nitrogen: 20%, Oxygen: 78%
4

Which of the following best describes an exothermic reaction?

A:A reaction that absorbs energy, decreasing temperature
B:A reaction that releases energy, increasing temperature
C:A reaction that does not involve a temperature change
D:A reaction that changes the state of matter
5

What is the general formula for alkenes?

A:CnH2n
B:CnH2n+1
C:CnH2n+2
D:CnHn
6

What is the process of using electricity to decompose ionic substances called?

A:Electrolyte
B:Electrolysis
C:Electrode
D:Electrostatic
7

What is the pH range for acids?

A:Greater than 7
B:Less than 7
C:Between 0 and 14
D:Equal to 7
8

Which of the following is not one of the main components of air?

A:Nitrogen (78%)
B:Oxygen (21%)
C:Argon (0.9%)
D:Helium (10%)
9

What is the purpose of a catalyst in a chemical reaction?

A:To increase the activation energy
B:To lower the activation energy
C:To speed up the reaction
D:To slow down the reaction
10

Which gas is mainly responsible for the greenhouse effect?

A:Carbon dioxide (CO2)
B:Methane (CH4)
C:Nitrous oxide (N2O)
D:Water vapor (H2O)