1st Nine Weeks Test Review

Which of the following best explains why CO₂ gas is easily compressible but solid CO₂ (dry ice) is incompressible?

• The molecules of CO₂ gas are much closer together than the molecules in dry ice.

• The molecules of solid CO₂ are much closer together than the molecules of CO₂ gas.

• The molecules of CO₂ gas are much smaller than the molecules of solid CO₂.

• The molecules of CO₂ gas attract one another, while the molecules of the solid CO₂ repel one another.

A student is doing an investigation with solids, liquids, and gases. They put each substance into a large syringe and press down. The student is not able to compress the solid or the liquid into a smaller volume. When they get to the gas, they notice that it will compress into a smaller volume. Why are gases more compressible than liquids and solids?

• Gas particles move slowly and this allows for them to be pushed together easily.

• The lower kinetic energy of solid particles makes their particles closer and less compressible.

• Since gas particles are spread so far apart, they are easily compressed.

• All of the above

Density refers to how heavy or how much matter is packed into a space. After comparing four liquids (liquid soap, maple syrup, olive oil, and water), a teacher wrote a statement about the liquids. "Olive oil is light and floats on the surface of the water. Liquid soap is lighter than the maple syrup. Maple syrup is more dense than water. Olive oil is less dense than liquid soap." Which of the following ranks the density of the liquids from least to greatest based on the teacher's statement?

• Olive oil, water, liquid soap, maple syrup

• Olive oil, liquid soap, water, maple syrup

• Water, olive oil, liquid soap, maple syrup

• Maple syrup, liquid soap, water, olive oil

Tags

NGSS.MS-PS1-2

The pictures above show a blue liquid being added to a clear liquid. Which is the best evidence that a chemical reaction may have occurred?

• The solution turned light blue.

• The temperature remained the same.

• Solid particles formed.

• The volume increased.

Tags

NGSS.MS-PS1-2

The table shows characteristics of three unknown materials. How could the materials BEST be classified?

• X: Metal Y: Metalloid Z: Nonmetal

• X:Metalloid Y: Metal Z: Nonmetal

• X: Metalloid Y: Metalloid Z: Nonmetal

• X: Metalloid Y: Metal Z: Nonmetal

Students were given a variety of materials to use to complete a simple electrical circuit. They discovered that paper clips, pennies, and nickels worked well, but that paper, erasers, and wooden pencils didn't. What physical property were the students testing?

• Luster

• Magnetism

• Conductivity

During a science discovery lesson, students learned that copper, aluminum, gold, and chromium can be bent, rolled out, or hit with a hammer and not shatter. What physical property were the students testing?

• luster

• scratch

• conductivity

• malleability

In science class today, a student describes the physical properties of metals, metalloids, and nonmetals. Which statement reflects an accurate description of the properties of metals, metalloids, and nonmetals?

• Nonmetals are not shiny, are not good conductors and are brittle solids or gases. Metals have a shiny luster, are good conductors of heat and electricity and are malleable. Metalloids can have the physical properties of both metals and nonmetals.

• Metals are shiny and brittle; they are good conductors of heat but not electricity. Metalloids can have the properties of both metals and nonmetals. Nonmetals would include gases and brittle solids; they are not good conductors and are not malleable.

• Metals have a shiny luster, are good conductors of heat and electricity and are bendable for wiring and jewelry. Metalloids are shiny; they can’t be used as conductors and are very malleable. Nonmetals are not shiny, are not good conductors and are brittle.

• Metalloids are shiny, malleable and make great conductors of heat and electricity. Metals are shiny, can be bent and are good conductors of electricity but not heat. Nonmetals do not have a shiny luster, do not make good conductors and are brittle solids and gases.

Two students make hot chocolate. One student pours the hot chocolate into a white foam cup. The other student pours the hot chocolate into a silver metal cup. The metal cup becomes too hot to touch, but the foam cup can be held comfortably. The best explanation for this difference in temperature is that the foam cup —

• heats up much faster than the metal cup

• is a better insulator than the metal cup

• is a better conductor of heat than the metal cup

• has a specific heat that is similar to that of the metal cup

Tags

NGSS.MS-PS1-4

When placed outside on a hot summer day, which of the following substances would feel the hottest to touch?

• Gold ring

• Sand

• Water

• Wood deck