Matter Unit 1a

Lucy noticed that her coin collection had begun to tarnish. Some of the metal in the coins had begun to change color. The formation of tarnish is most similar to which of the following changes?

• Melting ice cubes in a glass of juice

• Dropping a dinner plate on a floor

• Shredding a piece of paper into hundreds of tiny strips

• Burning a piece of paper to ashes in a fireplace

Tags

NGSS.MS-PS1-2

If 1kg of the compound toluene melts at -950C, then 500g of toluene will

• Boil at 47.5 0C

• Boil at 95 0C

• Melt at -47.5 0C

• Melt at -950C

Tags

NGSS.MS-PS1-4

Helium balloons! Fun at a party. But do you know one chemical property of helium? Helium is an odorless, colorless gas at room temperature. It is less dense than air. That's why helium balloons float. It is a non-reactive gas. Its melting point is -272.2 oC and its boiling point is -268.93 o Consider the paragraph above. What is one chemical property of helium?

• Less dense than air

• Colorless

• Boiling point is -268.93 oC

• Non-reactive

Which of the following is an example of a situation in which exothermic chemical reactions occur?

• Boiling pots of water turn into steam

• Fireworks explode on the 4th of July

• The sublimation of dry ice

• Ice cubes melt into water

Tags

NGSS.HS-PS1-4

Silver is a white metal that is an excellent conductor of heat and electricity. The density of silver is 10.49 g/cm3. Silver does not react with water but does react with nitric acid. Silver tarnishes when exposed to air.

A physical property of silver is

• Silver tarnishes when exposed to air.

• Silver reacts with nitric acid.

• The density of silver is 10.49 g/cm3.

• Silver does not react with water.

Tom places four objects in a tank of water. He makes the following observations:

A cork floats

A rock sinks

A soda can float

A piece of chalk sinks

Which statement is correct based on Tom’s observations?

• The cork and the soda can have a density greater than water.

• The rock and chalk have a density greater than water.

• The cork and the soda can have a density equal to water.

• he rock and chalk have a density less than water.

A student has a ball of wax. The student removes a small piece of wax from the ball. Which of the following statements is TRUE about what happens to the mass and melting point of the ball of wax after the piece is removed?

• Both the mass and melting point of the ball of wax change.

• The mass of the ball of wax changes, and its melting point stays the same.

• Both the mass and melting point of the ball of wax stay the same.

• The melting point of the ball of wax changes, and its mass stays the same.

Tags

NGSS.MS-PS1-4

Students measured and recorded the density of 4 samples. Using the density column and the data table shown above, which of the samples will probably float on top of the oil?

• Sample B

• Sample C

• Sample D

• Sample A

Tags

NGSS.MS-PS1-2

Consider these diagrams representing particle arrangements. Which correctly matches the diagrams with the three phases of matter?

• X, gas; Y, liquid, Z solid.

• X, solid: Y, Liquid; Z gas.

• X, solid; Y, gas; Z, liquid.

• X, gas; Y, solid, Z, liquid.

Which letter represents the portion of the phase change diagram during which the temperature of the liquid is rising?

• C

• E

• B

• D

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4