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Question 1: What is the chemical formula for water?
- NaCl
- CH4
- CO2
- H2O
Answer: D. H2O
Explanation: Water is a fundamental chemical compound composed of two hydrogen atoms covalently bonded to a single oxygen atom, resulting in the formula H2O.
Question 2: Which gas do humans breathe in to support respiration?
- Acetic acid
- Methane
- Oxygen
- Carbon dioxide
Answer: C. Oxygen
Explanation: Humans breathe in oxygen, which travels in pairs as O2 to support the vital process of respiration in our cells.
Question 3: What gas is released when humans breathe out and provides fizz in soda?
- Oxygen
- Glucose
- Carbon dioxide
- Methane
Answer: C. Carbon dioxide
Explanation: Carbon dioxide is the gas we exhale and is also responsible for the carbonation or fizz found in many soda drinks.
Question 4: What is the primary component of natural gas?
- Acetic acid
- Glucose
- Methane
- Calcium carbonate
Answer: C. Methane
Explanation: Methane, represented by the chemical formula CH4, is the simplest alkane and serves as the primary combustible component found in natural gas supplies.
Question 5: Which molecule is a sugar vital for energy production in cells?
- Calcium carbonate
- Sodium chloride
- Glucose
- Acetic acid
Answer: C. Glucose
Explanation: Glucose is a simple sugar molecule with the chemical formula C6H12O6 that acts as a vital energy source for cellular respiration in living organisms.
Question 6: What is the chemical name for common table salt?
- Sodium chloride
- Acetic acid
- Glucose
- Calcium carbonate
Answer: A. Sodium chloride
Explanation: Sodium chloride, chemically denoted as NaCl, is the ionic compound commonly known as table salt, which is widely utilized in food seasoning and preservation.
Question 7: Which molecule is found in vinegar?
- Calcium carbonate
- Methane
- Acetic acid
- Sodium chloride
Answer: C. Acetic acid
Explanation: Acetic acid is the primary organic compound found in vinegar, providing the liquid with its characteristic sour taste and acting as a common preservative.
Question 8: Which substance is found in chalk and some antacids?
- Calcium carbonate
- Acetic acid
- Glucose
- Sodium chloride
Answer: A. Calcium carbonate
Explanation: Calcium carbonate is a common chemical compound found in rocks like limestone and chalk, and it is used in some antacids.
Question 9: What do plants convert carbon dioxide into during photosynthesis?
- Water and chalk
- Vinegar and gas
- Methane and salt
- Glucose and oxygen
Answer: D. Glucose and oxygen
Explanation: During photosynthesis, plants use carbon dioxide from the air to produce glucose for food and release oxygen as a byproduct.
Question 10: Which molecule is the primary component of the air we breathe, making up about 78% of the atmosphere?
- Oxygen
- Nitrogen
- Carbon dioxide
- Argon
Answer: B. Nitrogen
Explanation: Nitrogen gas (N2) is the most abundant gas in Earth's atmosphere, accounting for approximately 78% of the air by volume.