Which of the following representations is correct for a chemical equation? Reactants=products Reactantsarrow Products Productsarrow Reactants Reactants+productsarrow Products+reactants

The number of moles of C in 3 moles of ethanol (CH_(3)CH_(2)OH) is __ 6.02times 10^23mol 6 mol 18 mol 4.5times 10^23mol

The number of moles present in 180 grams of hydrochloric acid is approximately __ 4.75 5.00 4.25 4.50

How many moles contain 5.75times 10^24 atoms of Al? 9.55times 10^2 2.13times 10^23 mol 9.55 mol 2.13 mol

How many atoms does a mole of atoms contain? 6.022times 10^23atoms 60.22times 10^23atoms 6.202times 10^23atoms 6.082times 10^23atoms

Which among the following statements is NOT TRUE regarding a mole? A mole is the SI unit to measure the amount of substance. 1mole=6.02times 10^23representative particles=Avogadro's number The representative particle of most of the elements is a molecule. A "representative element"refers to the species present in the substance.

How many molecules are there in 75 grams of aluminum triflouride? 5.68times 10^23 5.38times 10^23 5.98times 10^23 6.23times 10^23

Carnotite (K_(2)(UO_(2))_(2)(VO_(4))_(2)) and is one of 3 common vanadium ores. Vanadium metal can be extracted from this ore as pure vanadium. If you start with 985 g of carnotite, what is the maximum number of grams of V that can be extracted? A. 59.2 grams B. 98.5 grams C. 118 grams D. 120 grams E. 130 grams

2 mol of an ideal diatomic gas are cooled at constant volume until the pressure is reduced to 1/3 the initial pressure . What is the entropy change of the gas? A. -63.9J/K B +63.9J/K C. -9.13J/K D. 0 E. -45.6J/k

True or False Question The two primary iodine preparations are free iodine and iodophors. True False

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Hydrogen sulfide is: A) Odorless B) Colorless C) Not flammable D) Red in color

Question 21 Calculate $\Delta _{r}G^{\circ }$ at $25.0^{\circ }C$ for the reaction below. $2Na(s)+2H_{2}O(l)\rightarrow 2NaOH(aq)+H_{2}(g)$ Given: $\Delta _{r}H^{\circ }=-314kJ$ and $\Delta _{r}S^{\circ }=-117J/K$ (Report your answer in units of kJ, to one decimal place, i.e xxx.x, and no units are necessary in the answer.) (Remember to include a negative sign, if necessary.)

Which type of reaction is represented by the generic equation $AB+CD\rightarrow AD+CB$ combustion decomposition single replacement double replacement

Given the equilibrium constants for the following reactions: $4Cu(s)+O_{2}(g)\rightleftharpoons 2Cu_{2}O(s),K_{1}=6.19$ $4CuO(s)\rightleftharpoons 2Cu_{2}O(s)+O_{2}(g),K_{2}=0.16$ what is K for the system $2Cu(s)+O_{2}(g)\rightleftharpoons 2CuO(s)$ equivalent to? (Report your answer to four decimal places, i.e.xxxx) $\square $

What is the pH of a solution made by combining 0.484 m $NaC_{2}H_{3}O_{2}$ with 0.042 M $HC_{2}H_{3}O_{2}$ ? The $K_{a}$ of acetic acid is $1.75\times 10^{-5}$ (Report your answer to three decimal places, i.e x.xxx)

As pure molecular solids , identify the types of intermolecular forces in each: $PH_{3}$ $\square $ HF $\square $ $CO_{2}$ $\square $

What is the molality of ethanol $(C_{2}H_{5}OH)$ in an aqueous solution that is $48.2\% $ ethanol by mass? (Report your answer to two decimal places, i.e xx.xx, and no units are necessary in the answer.)

What is the molality of ethanol $(C_{2}H_{5}OH)$ in an aqueous solution that is $48.2\% $ ethanol by mass? (Report your answer to two decimal places, ite xxxx, and no units are necessary in the answer.)

Continue to shake until no more salt will come out of the shaker. What happens to the last several crystals of salt that come out? The sodium ions dissolve while the chloride ions sink to the bottom. The salt crystals react with the water to form a new compound. All of the ions separate from each other and dissolve into the water. The salt crystals don't dissolve in the water and fall to the bottom unchanged.

Consider the reaction of magnesium silicide with water shown below: $Mg_{2}Si(s)+4H_{2}O(l)\rightarrow 2Mg(OH)_{2}(aq)+SiH_{4}(g)$ In the reaction of 13.13 g $Mg_{2}Si$ with excess water, 16.03 g $Mg(OH)_{2}$ were produced. Calculate the percent yield of $Mg(OH)_{2}$ Enter the answer rounded to 2 decimal places.Units are not necessary. Answer: $\square $