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Questions in chemistry

[Done] Which energy conversion must occur in an operating electrolytic cell? 1. Electrical energy to chemical energy 2. Electrical energy to nuclear energy 3. Chemical energy to electrical energy 4. Chemical energy to nuclear energy

[Done] Which compound is classified as a hydrocarbon? 1. butanal 2. butyne 3. 2-butanol 4. 2-butanone

[Done] Which element is a liquid at STP (Standard Temperature and Pressure)? 1. Bromine 2. Francium 3. Cesium 4. Iodine

[Done] How many moles of water (H2O) would be produced if 10 moles of O2 gas reacted completely with excess H2 gas? \[2 \, \text{H}_2(g) + \text{O}_2(g) \rightarrow 2 \, \text{H}_2\text{O}(g)\] A. 5 B. 10 C. 20 D. 30

[Done] Which chemical equation best describes the reaction of potassium metal with fluorine gas to form solid potassium fluoride? A. K(s) + F2(g) → KF2(s) B. K(s) + F(g) → KF(s) C. K2(g) + F2(g) → 2 KF(s) D. 2 K(s) + F2(g) → 2 KF(s)

[Done] What is the color of the indicator thymol blue in a solution that has a pH of 11? A. red B. pink C. blue D. yellow

[Done] Which compound yields \( \text{H}^+ \) ions as the only positive ions in an aqueous solution? 1. \( \text{KOH} \) 2. \( \text{NaOH} \) 3. \( \text{CH}_3\text{OH} \) 4. \( \text{CH}_3\text{COOH} \)

[Done] The concentration of a solution can be expressed in: 1. Milliliters per minute 2. Parts per million 3. Grams per Kelvin 4. Joules per gram

[Done] Calculate the number of oxygen atoms in 2.00 moles of [tex]$Mn_2O_7$[/tex].

[Done] As water evaporates from an open container at 40°C, which one of the following is true? A. The water becomes warmer as the kinetic energy of the liquid water molecules increases. B. The water molecules decompose into hydrogen and oxygen molecules. C. The water molecules return to the surface as fast as they leave. D. The water vapor molecules have greater kinetic energy than the liquid water molecules.