Which of the following is a characteristic of a chemical reaction?
Change in color
Formation of a precipitate
Release of gas
Change in temperature
All of the above
The Correct Answer is E
Choice A reason: A color change during a chemical reaction indicates the formation of new substances with altered molecular structures, affecting light absorption. For instance, iron reacting with oxygen forms iron oxide, shifting from silver to reddish-brown. This reflects a chemical transformation where new compounds with distinct optical properties are produced, confirming a reaction at the molecular level.
Choice B reason: Precipitate formation signifies a chemical reaction as soluble reactants produce an insoluble solid. In a double displacement reaction, such as silver nitrate combining with sodium chloride, silver chloride precipitates. This occurs due to ion exchange, forming a new compound with low solubility, providing visible evidence of a chemical change driven by molecular restructuring.
Choice C reason: Gas release during a reaction indicates a chemical change, as new gaseous products form from reactants. For example, sodium bicarbonate reacting with acetic acid produces carbon dioxide gas. This results from molecular bond rearrangement, where reactants break and reform into new molecules, including a gas, confirming a chemical transformation.
Choice D reason: Temperature changes often accompany chemical reactions, reflecting energy shifts. Exothermic reactions, like combustion, release heat, increasing temperature, while endothermic reactions absorb heat, decreasing it. These changes occur as chemical bonds break and form, redistributing energy. This energy dynamic is a hallmark of chemical reactions, indicating molecular-level transformations.
Choice E reason: This choice is correct as all listed signs—color change, precipitate formation, gas release, and temperature change—are indicators of chemical reactions. Each reflects molecular rearrangements, such as new compound formation or energy shifts. By encompassing all these observable phenomena, this option accurately represents the diverse physical manifestations of chemical changes.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: Family history of hypertension is relevant for cardiovascular risk but less critical than smoking for estrogen therapy. Estrogens increase blood pressure slightly, but smoking directly amplifies thromboembolism risk, a major contraindication, making this choice secondary for immediate safety assessment.
Choice B reason: Soft lens use may cause discomfort with estrogens due to corneal changes, but this is a minor side effect. Thromboembolism risk, heightened by smoking, is far more severe, requiring priority assessment, as lens issues do not pose life-threatening risks.
Choice C reason: Sunlight exposure is unrelated to conjugated estrogens, which do not cause photosensitivity. Hormone therapy affects clotting and cardiovascular risk, not skin reactions to UV light, making this choice irrelevant for assessing safety before initiating estrogen treatment.
Choice D reason: Cigarette smoking history is critical, as smoking increases thromboembolism risk with conjugated estrogens, which promote clotting by altering coagulation factors. This risk is especially high in women over 35, necessitating smoking cessation or alternative therapies to prevent potentially fatal complications.
Correct Answer is A
Explanation
Choice A reason: Digoxin toxicity can cause visual disturbances, like seeing yellow halos, due to its effect on retinal cone cells. The client’s comment about a yellow uniform suggests this side effect. Evaluating for toxicity, including checking serum digoxin levels, is critical, as toxicity can lead to life-threatening arrhythmias.
Choice B reason: Withholding furosemide and forcing fluids is inappropriate, as the client’s visual symptom points to digoxin toxicity, not furosemide-related issues. Furosemide causes diuresis, but no evidence suggests dehydration here. This choice does not address the likely digoxin-induced visual disturbance.
Choice C reason: Assuming the client is joking ignores a potential digoxin toxicity symptom. Visual changes, like yellow-tinted vision, are serious and require investigation, not dismissal. Administering medications without evaluation risks exacerbating toxicity, making this choice unsafe and incorrect.
Choice D reason: Additional potassium-rich foods are unnecessary, as the client is already receiving potassium chloride. The visual symptom suggests digoxin toxicity, not hypokalemia. Potassium levels may influence digoxin toxicity, but the priority is evaluating digoxin’s effects, not dietary intervention.
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