Exam 2: Particles of Matter

Someone wants to sell you a piece of gold that they say is nearly pure. Before buying the piece, you measure its mass to be 52.3 grams and you find that it displaces 4.16 mL of water. Calculate its density and assess its purity given the fact that pure gold has a density of 19.3 g/mL.

In which are the molecules moving faster: a swimming pool of boiling water or a cup of boiling water?

If all of the above images represents the same material, which has the highest temperature?

A block of wood that weighs 10. g is immersed in water. The total amount of water displaced is 12 mL. What is the density of the block of wood?

Which of the following represents the largest quantity of mass?

What is temperature a measure of?

Heat Is a measure of ________.

When water freezes, it expands. What does this say about the density of ice compared with the density of water?

A post-1982 penny is made with zinc, but its density is actually greater than that of zinc because ________.

Which of the following units of measurement could be used to describe density?

Which would you rather have: a decigram or a kilogram of gold?

The diagram on the left in box A shows the interface of solid and liquid phases of a single substance where each sphere represents a molecule of that substance. Which box, A, B, or C, best represents what the molecules of this substance would look like if heat were added? Which box best represents what the molecules substance would look like if heat were taken away?

Red colored Kool-Aid crystals are added to a still glass of hot water. The same amount of crystals are added to a second still glass filled with the same amount of cold water. With no stirring, which of the following would occur?

Based on the Law of Mass Conservation, Lavoisier hypothesized that ________.

What state (or states) of matter does this diagram of submicroscopic particles represent?

Place a card over the open top of a glass filled to the brim with water, and then invert it, as is shown below. Why does the card stay in place? How about when the glass is held sideways?

A piece of aluminum weighing 10.0 grams is placed into a graduated cylinder that has an initial volume (before immersion) of 35.0 mL. After immersion, the volume on the cylinder reads 38.7 mL. What is the density of the metal sample?

According to John Dalton, atoms of a given element ________.

A TV screen looked at from a distance appears as a smooth continuous flow of images. Up close, however, we see this is an illusion. What really exists are a series of tiny dots (pixels). This is similar to a chemist's view of matter in that ________.

The scanning probe microscope creates images of atoms by ________.