1.Easy
What is an alpha particle made of?
- APure electromagnetic energy
- B1 proton and 1 electron
- CA single high-energy electron
- D2 protons and 2 neutrons
2.Easy
Which three elements make up carbohydrates?
- ACarbon, nitrogen and sulfur
- BHydrogen, nitrogen and phosphorus
- CCarbon, hydrogen and oxygen
- DCarbon, hydrogen and nitrogen
3.Easy
Which property is typical of metals?
- AThey conduct electricity well
- BMost of them are gases at room temperature
- CThey are poor conductors of heat
- DThey are brittle solids that shatter
4.Medium
Which coefficients balance __N₂ + __H₂ → __NH₃?
- A2, 3, 2
- B1, 3, 2
- C1, 1, 1
- D1, 3, 1
5.Medium
Normal saline (0.9% NaCl) is used for IV fluids. How is it described compared with blood?
- AIsotonic
- BHypertonic
- CHypotonic
- DSaturated
6.Medium
At STP (0 °C and 1 atm), what volume does 1 mole of an ideal gas occupy?
- A273 L
- B1.0 L
- C22.4 L
- D6.02 L
7.Hard
An unknown element is shiny, conducts electricity, and reacts vigorously with water to form a basic solution and hydrogen gas. In which group is it most likely?
- AGroup 1 (alkali metals)
- BGroup 14 (carbon group)
- CGroup 18 (noble gases)
- DGroup 17 (halogens)
8.Hard
Vitamin C is water-soluble and vitamin D is fat-soluble. What does this suggest about their molecules?
- AVitamin C is polar, while vitamin D is mostly nonpolar
- BBoth are equally polar
- CBoth are ionic compounds
- DVitamin C is nonpolar, while vitamin D is strongly polar
Answer key
- 1. D · 2 protons and 2 neutrons
- 2. C · Carbon, hydrogen and oxygen
- 3. A · They conduct electricity well
- 4. B · 1, 3, 2
- 5. A · Isotonic
- 6. C · 22.4 L
- 7. A · Group 1 (alkali metals)
- 8. A · Vitamin C is polar, while vitamin D is mostly nonpolar
Full step-by-step solutions: practise this topic on examproblems.com.