An example of a chemical property of formaldehyde (CH20) is_ it is flammable. it

Question

An example of a chemical property of formaldehyde (CH20) is_ it is flammable. it has a density of 1.09 g/mL. it dissolves in water. it is a gas at room temperature. As a summer intern at the National Institute of Standards and Technology, a student performed three measurements to determine the density of water at 25degreeC to four significant figures. She obtained the following results. The known density of water at 25degreeC to three significant figures is 0.958 g/mL The measurements were_ sufficiently precise but not accurate. sufficiently accurate but not precise. both sufficiently precise and accurate. neither sufficiently precise nor accurate. not repeated an adequate number of times. Dalton's law of multiple proportions can be applied to H2O and CO2. CO and NO. PF3 and PF5. SO2 and CO. O2 and O3.Zinc oxide is found in ointments for the skin. What formula best describes this compound, which has Zn as a doubly charged cation? ZnO Zn20 Zn02 Zn202 Zn203 A fuel cell works on the same principle as a battery but is continually fed with fuel. In one fuel cell, methanol (CH3OH) enters on one side of the unit, and air enters on the other side. Both circulate past electrodes, and a chemical reaction occurs that produces electricity plus carbon dioxide and water as byproducts. Which chemical reaction equation best represents the reaction that occurs in this fuel cell? CH3OH RIGHTARROW CO2 + H2O CH3OHRIGHTARROW CH3 + OH CH3OH RIGHTARROW CH2 + H2O CH3OH + O2 RIGHTARROW CO2 + H2O 2CH3OH + 3O2 RIGHTARROW 2CO2 + 4H2O The average adult exhales about 1.0 kg of carbon dioxide each day. How much glucose (C6Hi206, 180 g/mol) is consumed to make that much carbon dioxide? 3.8 kg 4.1kg 0.43 kg 0.68 kg 0.18 kg In terms of the enthalpy of formation, which of the following compounds is the most unstable compared to its elements under standard conditions? KCl(s), DELTA H DEGREE F = - 435.9 kJ/mol PH3(g),DELTA DEGREE F = +5.4 kJ/mol Fe3O4(S), DELTA H DEGREE F = 1117.1 kJ/mol NiO(s), DELTA H DEGREE F = - 239.7 kJ/mol ICI (g), DELTA H DEGREE F = + 17.8 kJ/mol

Explanation / Answer

1)

a. it is flammable

2)

a. sufficiently precise but not accurate

8)

b. CO and NO

10)

a. ZnO

13)

e. 2CH3OH + 3O2 = 2CO2 + 4H2O

14)

Equation for cellular respiration:

C6H12O6 + 6O2 = 6CO2 + 6H2O

Moles of CO2:

1.0 kg x 1,000 g/1 kg x 1 mol/44.01 g = 22.7 moles

Moles of C6H12O6:

22.7 moles of CO2 x (1 mole of C6H12O6 / 6 moles of CO2) = 3.78 moles

Mass of C6H12O6:

3.78 moles x 180 g/mol x 1 kg/1,000 g = 0.680 kg

The answer is d. 0.680 kg

27)

The compound with the highest enthalpy of formation is least stable.

The answer is e. ICl(g)

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