Question

When performing a calorimetry experiment, a metal is heated to100^oC and then immersed in a Styrofoam cup containing100g of water at a temperature of 22^oC. Describe thetransfer of heat assuming none is lost to theenvironment.

Heat will transfer from the water to the metal increasing thetemperature of the metal.
Heat will transfer from the water to the metal decreasing thetemperature of the water.
Heat is transferred from the metal to the water in an endothermicfashion with respect to the metal.
Heat is transferred from the metal to the water in an exothermicfashion with respect to the metal.
No heat is transferred because heat is not lost to theenvironment.

The Ideal Gas Law is PV= nRT. Which of the following relationshipsis (are) true for gases?

1. The number of moles of a gas is directly proportional to itsvolume (at constant pressure).
2. The pressure of a gas is inversely proportional to itstemperature in Kelvins (at constant volume).
3. The volume of a gas is directly proportional to its pressure(at constant temperature).

1 only
2 only
3 only
1 and 2
2 and 3

Ammonia is prepared by reacting nitrogen and hydrogen gases athigh temperature according to the unbalanced chemical equationbelow.

_ N₂(g) + _H₂(g) →_NH₃(g)

What are the respective coefficients when the equation isbalanced with the smallest whole numbers?

1,1,1
1,3,1
1,3,2
2,1,2
2,3,2

The combustion of propane produces carbon dioxide and steam.

C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(g)

All the following statements concerning this reaction arecorrect EXCEPT

Three molecules of carbon dioxide are formed per one molecule ofpropane consumed.
Five molecules of oxygen are consumed per one molecule propaneconsumed.
Four moles of steam are formed per five moles of oxygenconsumed.
The combined mass of reactants consumed equals the mass of productsformed.
Three grams of carbon dioxide are formed per five grams of oxygenconsumed.