PHYSCI REVIEW QUARTER 3

How many moles of NO2 can be produced from 4.3 moles of N2O5?

• A. 2.1 moles NO2

• B. 2.2 moles NO2

• C. 8.6 moles NO2

• D. 7.0 moles NO2

How many grams of N2O5 are needed to produce 75.0 grams of O2?

• A. 506 grams N2O5

• B. 126 grams N2O5

• C. 44 grams N2O5

• D. 5.5 grams N2O5

Which of the following represents a mole?

• A. 3 g of NaCl

• B. 5.01 x 1023 CH4 molecules

• C. 6.02 x 1023 F atoms

• D. 25 g graphite, C-atom

What is the greatest amount of NH3 (in moles) that can be made with 3.2 moles of N2 and 5.4 moles of H2?

• A. 1.8 mols of NH3

• B. 3.6 mols of NH3

• C. 6.4 mols of NH3

• D. 9.6 mols of NH3

What is the limiting reactant in the reaction?

• A. H2

• B. N2

• D. both N2 and H2

• C. NH3

How many moles of it are left over?

• A. 1.4 mols of N2

• B. 1.4 mols of H2

• C. 1.8 mols of N2

• D. 1.8 mols of H2

The uses of sports equipment, medical devices, and household gadgets depend on their

• A. Properties

• B. Intermolecular forces

• C. Bond

• D. Melting point

How many grams of NH3 are present in the 5.28 x 1023 molecules of NH3? N=14 g

• A. 14.9 grams

• C. 1.49 grams

• B. 15 grams

• D. 1.50 grams

Which of the following does NOT explain why composite materials are normally used in sports equipment?

• A. They have soft, rubber-like or jelly properties.

• B. They have lightweight and allow easy movement for the user.

• C. They have two or more constituents joined together by different bonding forces.

• D. Durable enough for longer time of usage.

The boiling point of substance X is higher than that of substance Y. What does this mean?

• A. Substance X is less viscous than substance Y.

• B. Substance X evaporates faster than substance Y.

• C. Substance Y has greater surface tension than substance X.

• D. Substance Y has weaker intermolecular forces than substance X.