Unit 1 Test Review

Which of the descriptions describes how a particle picture would look for a solid?

• A diagram showing closely packed particles representing solid ice.

• A diagram showing widely spaced particles representing a gas.

• A diagram showing loosely packed particles representing a liquid.

• A diagram showing particles arranged randomly with large gaps between them.

What would a particle picture look like for a liquid?

• A diagram showing particles that are a bit spread out

• A diagram showing particles that are far apart

• A diagram showing particles that are tightly packed in a fixed position

Tags

NGSS.MS-PS3-4

What would a particle picture look like for a gas?

• A diagram showing particles spread far apart and spread throughout the whole container space

• A diagram showing particles closely packed in a regular pattern

• A diagram showing particles that are a bit spread out

Tags

NGSS.MS-PS1-4

The particle picture shows 2 liquids combined together to form a solid. Which correction should be made to the particle diagram, and why is the original not correct? Mass Before: 5.68g, Mass After: 5.68g.

• There should be 6 particles in the mass after picture since the mass is the same from before and after (conservation of matter)

• The diagram should show the two liquids remaining separate, because no reaction has occurred.

• The diagram should show a gas being formed, because the mass would decrease if gas escaped.

• The diagram should show fewer particles after the reaction, because mass is lost during the process.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the experiment below the students combine a solid and a liquid to form a new mixture. What would be the mass of the new mixture? This is a CLOSED system.

• 1.9g

• 1.2g

• 2.5g

• 0.8g

Tags

NGSS.MS-PS1-5

Using the graph above, determine the Density of Substance A. Show your work and include units.

• Density of Substance A = 20 g / 10 mL = 2 g/mL

• Density of Substance A = 50 g / 100 mL = 0.5 g/mL

• Density of Substance A = 100 g / 100 mL = 1.0 g/mL

• Density of Substance A = 100 g / 50 mL = 3.0 g/mL

Tags

NGSS.MS-PS1-2

What is the "Science" equation based on this graph for Substance A in terms of y = mx + b?

• Volume = 1.0 g/ml * Mass

• Mass = 2.0 g/mL * Volume

• Mass = 0.5 g/mL * Volume

• Mass = -1.0 g/mL * Volume

Which of the following best represents the line for water (density = 1.00 g/mL) on the mass vs. volume graph?

• A straight line passing through the origin (0,0) with a slope of 1

• A horizontal line at mass = 1 g

• A vertical line at volume = 1 mL

• A straight line passing through the origin with a slope of 0.5

The density of titanium is around 5 g/mL. The density of water is much, much smaller than this (1 g/mL). Which particle diagram best explains why titanium is denser than water when both have the same volume?

• Titanium (10 particles) are packed much closer together than water (2 particles), showing less empty space between them.

• Titanium (10 particles) are spread out with lots of empty space, while water (2 particles) are tightly packed.

• Both titanium and water particles are equally spaced, showing no difference in density and the same number of particles)

• Water (10 particles) are packed closer together than titanium (2 particles), showing less empty space between them.

Using Data Table 1, determine the mass for Aluminum if you had 15 mL. Show your work and include units.

• Mass = Density × Volume = 2.70 g/mL × 15 mL = 40.5 g

• Mass = Density × Volume = 1.00 g/mL × 15 mL = 15.0 g

• Mass = Density × Volume = 7.87 g/mL × 15 mL = 118.05 g

• Mass = Density × Volume = 2.70 g/mL × 10 mL = 27.0 g