Comp 3 PMA #2 Review

Directions: Select each correct entry in the table.

Kelly has a sample of an unknown substance. Which properties of the substance will be the same no matter how large or small her sample is?

• Melting point

• Mass

• Solubility

• Conductivity

• Density

Federico has two samples of pure water—sample X and sample Y. Sample X has a volume of 1 L, and sample Y has a volume of 10 L. How do the boiling points of these two samples compare?

• Whichever sample receives heat first will have a lower boiling point.

• Sample Y will boil at a lower temperature because it has more volume.

• Sample X and sample Y will boil at the same temperature.

• Sample X will boil at a lower temperature because it has less volume.

Tags

NGSS.MS-PS1-4

A 10 g sample of butter will melt at a temperature that is _______ the melting point of a 5 g sample of butter.

• double

• equal to

• less than

• triple

Tags

NGSS.MS-PS1-4

A piece of plastic (sample Q), was heated at a constant rate. After 20 minutes of adding heat, the plastic melted. When an identical piece of plastic (sample R), was heated with twice as much heat per minute, the plastic melted in 10 minutes.

How do the melting points of the two pieces of plastic compare?

• The melting points of sample Q and sample R are the same.

• The melting point of sample Q is higher than sample R's.

• The melting point of sample R is slightly higher than sample Q's.

• The melting point of sample R is double that of sample Q.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Each student in Ms. Major's class was given an unknown substance. Ms. Major gave her students a list, shown below, of substances and their properties to help them identify their unknown.

If a student's unknown is a white solid and its density was calculated to be about 1.7 g/mL, it is most likely _______.

• water

• ethanol

• phosphoric acid

• sodium hydroxide

What is the identity of a sample that has a volume of 0.56 cm3 and a mass of 10.8 g?

• lead

• gold

• silver

• mercury

True or false. Gas particles never touch each other.

• True; gas particles move too rapidly to ever touch.

• False; gas particles are constantly touching each other.

• False; gas particles can touch each other when they collide.

• True; gas particles are located too far apart to ever touch.

Tags

NGSS.MS-PS2-1

What state of matter is best represented by the diagram below?

• liquid

• solid

• gas

• all of these

When substances go through chemical changes, which of the following will always happen?

• A gas will form or a white solid will precipitate.

• One or more substances will be completely destroyed.

• Exactly one new substance will form and one will be destroyed.

• One or more substances with different chemical properties will form.

Tags

NGSS.MS-PS1-2

Mario places 10 mL of water in a test tube and heats the liquid over a Bunsen burner for 2 minutes. After removing the test tube from the Bunsen burner, there are 6 mL of water left in the test tube. This experiment is a good example of a

• chemical change involving chemical reactions.

• chemical change involving phase changes.

• physical change involving phase changes.

• physical change involving chemical reactions.

Tags

NGSS.MS-PS1-4