INTRODUCTORY CHEMISTRY TEST BANK: 50+ ESSENTIAL MCQS
(CHAPTERS 1-4)
1. A certain chemical reaction proceeds optimally at 299°C. What is this in °F?
A. 570.2
B. 482.0
C. 590.0
D. 212.0
Answer: A. 570.2
Explanation:** Use the formula °F = (°C × 9/5) + 32. Calculation: (299 × 9/5) + 32 =
570.2°F.
2. A nonmetal atom that gains an electron is known as a(n):**
A. Cation
B. Anion
C. Isotope
D. Free radical
Answer: B. Anion
Explanation: Nonmetals gain electrons to form negatively charged ions (anions).
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,3. The density of lead is 11.35 g/mL. Experimental values are 11.3, 11.3, and 11.4 g/mL.
This data is:
A. Accurate but not precise
B. Precise but not accurate
C. Both precise and accurate
D. Neither precise nor accurate *
Answer: C. Both precise and accurate
Explanation: The values are close to each other (precise) and near the true density
(accurate).
4. The phase change from a solid directly to a gas is called:
A. Condensation
B. Sublimation
C. Deposition
D. Evaporation
Answer: B. Sublimation
Explanation: Sublimation bypasses the liquid phase (e.g., dry ice or mothballs).
5. Which group in the periodic table forms ions with a +1 charge?**
A. Alkaline earth metals
B. Halogens
C. Alkali metals
D. Noble gases
Answer: C. Alkali metals
Explanation: Alkali metals (Group 1) lose one electron to form +1 ions.
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, 6. The human body is primarily composed of which element?
A. Carbon
B. Oxygen
C. Hydrogen
D. Nitrogen
Answer: B. Oxygen
Explanation: Oxygen makes up ~65% of body mass, mainly in water and biomolecules.
7. What is an endothermic reaction?**
A. Releases heat
B. Absorbs heat
C. Occurs spontaneously
D. Involves combustion
Answer: B. Absorbs heat
Explanation: Endothermic reactions require energy input (e.g., photosynthesis).
8. Which of the following is NOT a chemical change?
A. Burning wood
B. Rusting iron
C. Boiling water
D. Digesting food
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(CHAPTERS 1-4)
1. A certain chemical reaction proceeds optimally at 299°C. What is this in °F?
A. 570.2
B. 482.0
C. 590.0
D. 212.0
Answer: A. 570.2
Explanation:** Use the formula °F = (°C × 9/5) + 32. Calculation: (299 × 9/5) + 32 =
570.2°F.
2. A nonmetal atom that gains an electron is known as a(n):**
A. Cation
B. Anion
C. Isotope
D. Free radical
Answer: B. Anion
Explanation: Nonmetals gain electrons to form negatively charged ions (anions).
Please leave a review. Your review is my motivation. Success in your Exams
,3. The density of lead is 11.35 g/mL. Experimental values are 11.3, 11.3, and 11.4 g/mL.
This data is:
A. Accurate but not precise
B. Precise but not accurate
C. Both precise and accurate
D. Neither precise nor accurate *
Answer: C. Both precise and accurate
Explanation: The values are close to each other (precise) and near the true density
(accurate).
4. The phase change from a solid directly to a gas is called:
A. Condensation
B. Sublimation
C. Deposition
D. Evaporation
Answer: B. Sublimation
Explanation: Sublimation bypasses the liquid phase (e.g., dry ice or mothballs).
5. Which group in the periodic table forms ions with a +1 charge?**
A. Alkaline earth metals
B. Halogens
C. Alkali metals
D. Noble gases
Answer: C. Alkali metals
Explanation: Alkali metals (Group 1) lose one electron to form +1 ions.
Please leave a review. Your review is my motivation. Success in your Exams
, 6. The human body is primarily composed of which element?
A. Carbon
B. Oxygen
C. Hydrogen
D. Nitrogen
Answer: B. Oxygen
Explanation: Oxygen makes up ~65% of body mass, mainly in water and biomolecules.
7. What is an endothermic reaction?**
A. Releases heat
B. Absorbs heat
C. Occurs spontaneously
D. Involves combustion
Answer: B. Absorbs heat
Explanation: Endothermic reactions require energy input (e.g., photosynthesis).
8. Which of the following is NOT a chemical change?
A. Burning wood
B. Rusting iron
C. Boiling water
D. Digesting food
Please leave a review. Your review is my motivation. Success in your Exams
