Holguin Unit 2 Assessment (10 questions)

Unit 2 Assessment (10 questions)

Multiple Choice

Jason wanted to explain the difference between mass and weight to his classmates. Which is a correct statement that Jason could include in his explanation? (8.P.8.2)

• Mass is the measure of the gravitational force on an object.

• Weight is a measure of the amount of matter in an object.

• Weight varies depending on where the object is in the Solar System.

• Mass varies depending on the location of the object.

Multiple Choice

Thomas performed an experiment to measure the temperature of water as he heated it on a hotplate. At the end of his experiment, he plotted the results as shown in the graph below.

Which of the following physical properties of water did Thomas measure? (8.P.8.4)

• densities and physical states of matter

• volume and thermal conductivity

• solubility and electrical conductivity

• melting point and boiling point

Multiple Choice

Owen wanted to determine the density of a wooden block. He made the measurements shown below. Owen knew he could use these measurements to calculate the amount of space occupied by the block.

What else must Owen determine in order to calculate the density of this block? (8.P.8.3)

• its volume

• its mass

• its surface area

• its number of sides

Multiple Choice

For a laboratory exercise in class, a student is given a mixture of small pieces of iron, sand, water, and salt. What physical property could be used to best separate the iron from the other ingredients? (8.P.8.4)

• electrical conductivity

• solubility

• melting point

• magnetism

Multiple Choice

This physical property is one that remains the same regardless of the amount of matter that is present. Which of the following physical properties of matter is described above? (8.P.8.4)

• density

• mass

• volume

• weight

Multiple Choice

Mario performed an experiment to investigate how certain substances dissolve in water.  He poured the substances in separate beakers of water and stirred each one using a glass rod. He then observed the results. What physical property of the substances did Mario investigate? (8.P.8.4)

• melting point

• solubility

• thermal conductivity

• density

Multiple Choice

Copper has a density of 9 g/cm3. Suppose you had a piece of copper that had a mass of 27 grams.

The formula for density (D) is D = m/v, where m is mass and v is volume.  What is the volume of this piece of copper metal? (8.P.8.3)

• 3 cm³

• 81 cm³

• 10 cm³

• 19.3 cm³

Multiple Choice

Physical properties can be used to classify and compare substances. The illustration below shows a physical property that is being investigated using different materials.What physical property is most likely being investigated in this illustration? (8.P.8.4)

• thermal conductivity

• magnetism

• melting point

• electrical conductivity

Multiple Choice

The ability to conduct an electric current, dissolve in water and melt are considered which of the following? (8.P.8.4)

• chemical properties

• physical changes

• physical properties

• chemical changes

Multiple Choice

Which of the following actions described below will change an object's weight, but not its mass? (8.P.8.2)

• Putting the object in a box

• Breaking the object

• Compressing the object

• Placing the object on a different planet

Multiple Choice

Sam finds a gold-colored rock on a hike. He takes it home and uses his digital scale to find its mass of 25g. Sam uses a graduated cylinder and water displacement to find the volume of the rock to be 5 cm3.  The formula for density (D) is D = m/v, where m is mass and v is volume.  What is the rock’s density? (8.P.8.3)

• 30 g/cm³

• 20 g/cm³

• 5 g/cm³

• 125 g/cm³