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WorksheetsFormative Assessment
Total questions: 20
Worksheet time: 5mins
1. Most of the gas is actually empty space.
TRUE
FALSE
2. Hydrochloric acid will effuse faster than iodine gas.
TRUE
FALSE
3. Lithium has a higher ionization energy than sodium.
TRUE
FALSE
4. An atom with 6 valence electrons will likely form an ion with a +2 charge.
TRUE
FALSE
5. When gas particles hit each other, they lose a lot of energy and slow down.
TRUE
FALSE
6. The nonmetals tend to gain an electron because they have low ionization energy.
TRUE
FALSE
7. Nonmetals on the right side of the periodic table usually have a strong desire to gain electrons.
TRUE
FALSE
8. If the molar mass of a compound is twice than ammonia, the effusion rate will be reduced by a factor of 1/√2.
TRUE
FALSE
9. Lower temperature reduces molecular kinetic energy, so the pressure inside the football to decrease during winter.
TRUE
FALSE
10. Ionization energy is the energy supplied to remove an electron while electron affinity is the energy released to gain an electron.
TRUE
FALSE
11. Two gases at the same temperature: hydrogen and oxygen. Which has faster molecular speeds, and why?
Hydrogen because lighter molecules move faster while average kinetic energy is the same.
Both move at the same speed because they share the same temperature.
Neither because speed depends only on pressure.
Oxygen because it has higher mass.
12. A gas of molar mass 4 g/mol effuses compared to one of 64 g/mol. According to Graham's law, how much faster is the lighter gas?
2 times faster
4 times faster
8 times faster
16 times faster
13. Why does chlorine have higher electron affinity than fluorine?
Chlorine has fewer protons.
Fluorine is less electronegative.
Chlorine's nucleus is weaker than fluorine's.
Fluorine's small size causes electron repulsion when adding an electron.
14. Why does oxygen form O2- rather than O-?
Oxygen is a noble gas when O-.
One added electron is unstable.
Oxygen cannot hold just one extra electron.
Oxygen needs two electrons to complete its octet
15. In an experiment, NH3 and HCl gases meet in a tube to form a white ring of NH4Cl. Why does the ring form closer to the HCl side?
HCl molecules are smaller and faster.
NH3 diffuses faster because it is lighter.
NH3 diffuses slower because it is lighter.
Both gases diffuse equally, but HCl reacts sooner.
16. Why does the balloon shrink instead of collapsing completely when cooled in liquid nitrogen?
Air leaks out during cooling.
Gas molecules stop moving at low temperature.
The balloon material becomes stiffer in the cold.
Some molecular motion remains, so pressure inside is not zero.
17. Why does heating a sealed gas container increase pressure?
Molecules gain kinetic energy and hit walls harder and more often.
Molecules stick to the walls at higher temperatures.
Volume increases while mass decreases.
Gas expands to fill the container.
18. Which of the following gas effuses twice faster than chlorine gas?
Oxygen
Ammonia
Sulfur dioxide
Carbon monoxide
19. At the same temperature, Neon effuses through a small hole. Another unknown gas effuses at half the rate of neon. What is the molar mass of the unknown gas?
10 g/mol
20 g/mol
40 g/mol
80 g/mol
20. Why does magnesium have a higher ionization energy than sodium?
Magnesium has a larger radius.
Magnesium has more shielding.
Magnesium's electrons are held more tightly.
Sodium has a smaller effective nuclear charge.
