Walking Science Facts: Practice Quiz

Ten questions pulled at random. Regenerate any time for a fresh set.

1. 1. The density of air is roughly:

   13 g/L0.13 g/mL1 g/mL1.3 g/L

2. 2. An electron's mass is about:

   10⁻²³ kg10⁻³⁰ kg10⁻²⁶ kg10⁻¹⁸ kg

3. 3. Roughly how many times lighter is an electron than a proton?

   2002,000,000200020

4. 4. Hydrogen's electronegativity is:

   2.23.04.01.0

5. 5. Visible light spans about:

   3–7 µm30–70 nm300–700 µm300–700 nm

6. 6. Breaking a chemical bond is:

   Always exothermicSometimes exothermicAlways endothermicAlways neutral

7. 7. One mole of ideal gas at STP occupies:

   22.4 L1 L24.4 L2.24 L

8. 8. About how much does a single atom weigh?

   10⁻³ g10⁻³⁰ g10⁻²³ g1 g

9. 9. ΔH(vap) of methanol is closest to:

   400 kJ/mol35 kJ/mol80 kJ/mol5 kJ/mol

10. 10. One hydrogen bond is worth about:

    200 kJ/mol2 kJ/mol20 kJ/mol400 kJ/mol