What is the formula for calculating density?

Density = mass / volume

Fill in the blank: The ability of a material to float or sink in water is determined by its ______.

Density

True or False: All materials with high density sink in water.

False. While many dense materials sink, some can float if their overall structure allows for lower average density.

Which of the following has the highest density? A) Helium B) Water C) Osmium D) Aluminium

C) Osmium

Riddle: I am a process that occurs when hot air rises and cold air sinks, creating a cycle. What am I?

Convection

What is the typical density of water?

1.0 g/cm³

Fill in the blank: In solids, conduction is most effective because particles are ______ packed together.

Tightly

True or False: Radiation requires a medium for heat transfer.

False. Radiation can occur through empty space.

Which of the following materials is a poor conductor of heat? A) Metal B) Wood C) Water D) Air

B) Wood

Riddle: I am the energy that flows from a hotter object to a colder one. What am I?

Heat

What phenomenon explains why a sparkler burning at 1000 °C does not cause severe burns?

The spark has a very small mass and contains less thermal energy.

Fill in the blank: Gases have lower densities than ______ or ______.

Liquids, solids

True or False: Evaporation cools the remaining liquid by increasing its temperature.

False. Evaporation cools the remaining liquid by decreasing its temperature.

Which of the following methods does NOT transfer thermal energy? A) Conduction B) Convection C) Radiation D) None of the above

D) None of the above

Riddle: I have a silver coating to reflect heat, and I keep drinks hot or cold. What am I?

Vacuum flask