A chemical reaction in which bonds are broken is usually associated with
forming a larger molecule
the consumption of energy
the release of energy
a synthesis
The Correct Answer is B
A. Forming a larger molecule: The formation of larger molecules occurs during synthesis reactions, where smaller molecules combine. Bond breaking is not linked with building larger molecules.
B. The consumption of energy: Breaking chemical bonds requires input of energy to overcome the attractive forces holding atoms together. This energy is absorbed from the surroundings, making bond breaking an endergonic process.
C. The release of energy: Energy release happens when new, more stable bonds are formed during reactions. Bond breaking itself does not release energy but instead requires energy.
D. A synthesis: Synthesis refers to constructing complex molecules from simpler ones, which usually involves bond formation rather than bond breaking.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. 37 protons and 37 neutrons: The atomic number defines the number of protons, so an atomic number of 74 corresponds to 74 protons, not 37. Neutron number can vary depending on the isotope.
B. 37 protons and 37 electrons: Similarly, the number of protons equals the atomic number, which is 74 in this case. Electrons in a neutral atom also equal 74, not 37.
C. 74 protons: The atomic number of an element specifies the number of protons in its nucleus. Therefore, an atom with an atomic number of 74 has 74 protons.
D. 74 neutrons: Neutron number is not directly determined by the atomic number; it varies among isotopes. The atomic number only defines the number of protons.
Correct Answer is D
Explanation
A. Sodium bicarbonate: Sodium bicarbonate has the chemical formula NaHCO₃, which is different from H₂CO₃. It acts as a base in buffering systems.
B. Glucose: Glucose is a carbohydrate with the formula C₆H₁₂O₆, and it does not contain the acidic hydrogen atoms found in H₂CO₃.
C. Sulfuric acid: Sulfuric acid has the chemical formula H₂SO₄. It contains sulfur and is a strong acid, unlike H₂CO₃.
D. Carbonic acid: H₂CO₃ is carbonic acid, formed when carbon dioxide dissolves in water. It plays an important role in maintaining blood pH and the bicarbonate buffering system.
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