Question

1. the elements iron (fe), copper (cu), and mercury (hg) are classified as metals. which physical property of metals do they all share?

a. they are all magnetic.
b. they are all shiny, reddish color.
c. they all have the same melting points.
d. they all have thermal and electrical conductivity.

1. mike wants to compare the densities of two types of rock. she knows that the formula for density is d = m/v. mike finds two rock samples that have the same mass. to find the volume in milliliters (ml) of the samples, she first fills two beakers with equal amounts of water. then she puts one rock sample in each beaker. the picture below shows how the two samples displaced the water in the beakers.

based on these results, which of the following is true about the densities of the two rock samples?
a. the two rock samples have equal densities.
b. it is not possible to compare the densities based on this information.
c. the sample in beaker b has a higher density than the sample in beaker a.
d. the sample in beaker a has a higher density than the sample in beaker b.

1. water has a melting point of 0°c and a boiling point of 100°c. between these temperatures, it exists as a liquid. look at the graphs below.

which of the following is true, based on the data in the graphs above?
a. substance b is a liquid at room temperature.
b. substance b has a higher boiling point than water.
c. substance b does not change states as water does.
d. substance b has a higher melting point than water.

Explanation:

Step1: Analyze question 1

Metals like Fe, Cu, Hg have thermal and electrical conductivity. Copper and mercury aren't magnetic, they don't have same color or melting - points.

Step2: Analyze question 2

Using density formula $D = \frac{m}{v}$, same mass samples. Beaker A has less volume displacement, so higher density as density is inversely proportional to volume for same mass.

Step3: Analyze question 3

From the graphs, substance B has a higher boiling - point than water.

Answer:

1. d. They all have thermal and electrical conductivity.
2. d. The sample in Beaker A has a higher density than the sample in Beaker B.
3. b. Substance B has a higher boiling point than water.