1. Which of the following states of matter has a definite shape and volume?
Answer:
Explanation:
Solids have a fixed structure with a definite shape and volume.
2. The intermolecular force of attraction in gases is:
Answer:
Explanation:
Gases have weak intermolecular forces, allowing them to expand and fill their container.
3. Which state of matter is characterized by fluidity and almost incompressibility?
Answer:
Explanation:
Liquids flow and have a definite volume, but they cannot be easily compressed.
4. Which law states that the volume of a gas is directly proportional to its absolute temperature at constant pressure?
Answer:
Explanation:
Charles's law relates volume and temperature of a gas at constant pressure.
5. The process of a solid directly converting into a gas is called:
Answer:
Explanation:
Sublimation is the direct transition of a substance from the solid phase to the gas phase.
6. In which state of matter do particles have the maximum kinetic energy?
Answer:
Explanation:
Particles in the gaseous state move rapidly and have the highest kinetic energy.
7. The process of a gas directly converting into a solid is called:
Answer:
Explanation:
Deposition is the direct transition of a substance from the gas phase to the solid phase.
8. Which law states that equal volumes of all gases contain the same number of molecules under identical conditions of temperature and pressure?
Answer:
Explanation:
Avogadro's law states that volume and the number of molecules are directly proportional under constant temperature and pressure.
9. The process by which a liquid turns into a gas upon heating is called:
Answer:
Explanation:
Vaporization is the process by which a liquid becomes a gas due to an increase in temperature.
10. What is the predominant intermolecular force in noble gases?
Answer:
Explanation:
Noble gases are nonpolar and exhibit weak London dispersion forces.
11. The temperature at which the vapor pressure of a liquid equals the atmospheric pressure is called:
Answer:
Explanation:
At the boiling point, a liquid starts converting into a vapor at atmospheric pressure.
12. Which state of matter has no definite shape but a definite volume?
Answer:
Explanation:
Liquids take the shape of their container but have a constant volume.
13. Which law relates the pressure and volume of a gas at constant temperature?
Answer:
Explanation:
Boyle’s law states that pressure is inversely proportional to volume at a constant temperature.
14. The phenomenon where a substance in the solid state transforms directly into the gaseous state upon heating without passing through the liquid state is observed in:
Answer:
Explanation:
Iodine undergoes sublimation upon heating.
15. Which state of matter is considered to be superheated and electrically charged?
Answer:
Explanation:
Plasma is a hot, ionized state of matter containing equal numbers of positive ions and electrons.
16. When a gas is cooled or compressed at constant temperature, it condenses to form:
Answer:
Explanation:
Cooling or compressing a gas leads to its condensation into a liquid.
17. The attraction between molecules of different substances is called:
Answer:
Explanation:
Adhesion refers to the attraction between different kinds of molecules.
18. What is the SI unit of pressure?
Answer:
Explanation:
The SI unit of pressure is Pascal (Pa).
19. The process in which a solid changes directly into a liquid upon heating is called:
Answer:
Explanation:
Melting is the process by which a solid becomes a liquid upon heating.
20. The gaseous state of a substance that is generally found in the liquid state at room temperature is called:
Answer:
Explanation:
A substance in the gaseous state, which is normally liquid at room temperature, is termed as vapor.