23. The boiling point of a substance is the temperature at which it changes from

Question

23. The boiling point of a substance is the temperature at which it changes from .a liquid to a solid. a liquid to a gas. a solid to a liquid. a gas to a solid. 24. Which one of the following is not a property of gases? They can diffuse. . They have no definite shape. . They have a definite mass. They have a definite volume 25. All solids, liquids and gases are made up of .volumes . colours . temperatures particles 26. Which one of the following is a state of matter? Air . Particle Creature · Liquid 27. Dry ice is used in fire extinguishers. The dry ice is stored in the cylinder in a solid form. When sprayed on a fire it quickly changes into the gas known as carbon dioxide (CO2) What is this change of state called? . Sublimation . Condensation Distillation Evaporation 28. Melting is the change in state ofa . solid to a liquid. liquid to a gas. . solid to a gas. liquid to a solid 29. Which one of the following is not considered to be one of the three states of matter? Mass · Liquid Solid .Gas

Explanation / Answer

23. Boiling point of a substance is the temperature at which it changes from solid to liquid.

24. Gases do not have definite volumes and take the volume of the container.

25. All solids liquids and gases are made up of particles.

26. Liquid is a state of matter.

27. Sublimation.conversion of solid directly to gas is called sublimation.

28. Melting is the change in state of a solid to liquid.

29. Mass is not a state of matter.

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