CFE Practice 1

A student adds a white powder to water. She stirs it until she can no longer see the powder. She leaves it in the science laboratory and returns the next morning. She notices there is no liquid in the beaker, but only a white powder is at the bottom. Which of the following would provide evidence that a physical change occurred and not a chemical change?

• showing that the flammability of the white powder is different than it was before mixing it with the water

• showing that the melting point of the white powder is the same as it was before mixing it with the water

• showing that the density of the white powder is different than it was before mixing it with the water

• showing that the temperature of the laboratory is the same as it was before mixing the powder with the water

Tags

NGSS.MS-PS1-2

The Sun, Earth, and Moon interact in many ways. The image below shows an alignment of the Sun, Earth and Moon.

• a third quarter moon

• a lunar eclipse

• a solar eclipse

• a new moon

Tags

NGSS.MS-ESS1-1

Stars have several characteristics to help astronomers classify them. The table compares two stars, Canopus and Arcturus. Canopus is farther from the Earth than Arcturus. Why does it appear brighter to a viewer on Earth than Arcturus?

• It emits light that travels at a greater speed.

• It has a greater apparent brightness.

• It emits more infrared and ultraviolet light.

• It reflects more visible light.

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

• less than

• equal to

• double

• triple

Tags

NGSS.MS-PS1-4

A scientist wants to know how individual lions within a pride interact with each other in their own environment.

To do this, the scientist sedates and tags all of the lions within a pride. Then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. He collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.

This example shows that:

• conditions and variables are best controlled in observational field studies.

• not all scientific knowledge is gained through controlled laboratory experiments.

Tags

NGSS.MS-LS2-4

Mars, like the other seven planets of the Solar System, orbits the Sun. What keeps Mars in orbit around the Sun?

• the rotation of Mars

• the Sun's gravity

• the Sun's thermal energy

• the temperature of Mars

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

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

• gas

• solid

• liquid

• all of these

Tags

NGSS.MS-PS1-4

All materials are made up of elements. Which of the following best describes elements?

• Elements combine in several different ways to make many kinds of compounds.

• Mixtures combine in several different ways to make many kinds of elements.

• Elements are unable to combine in order to make different compounds.

• Compounds combine in several different ways to make a limited number of elements.

Using only information from the table, which statement correctly describes the density of the metal rods?

• There is not enough information to calculate the density of the metal rods.

• The copper rod has the greatest density of all of the metal rods.

• The iron rod has the lowest density of all of the metal rods.

• The density is the same value for all of the metal rods.

The Earth has a mass of about 6x10^24 kg and orbits about the Sun. As it orbits, it moves at over 60,000 miles per hour. With such great mass and speed, what keeps the Earth from moving away from the Sun and out of the Solar System?

• the Sun's rate of rotation

• the Sun's gravitational force

• the amount of heat that is continuously released from the Sun

• the speed at which the Sun moves in the galaxy

Tags

NGSS.MS-ESS1-1

NGSS.MS-ESS1-2

NGSS.MS-PS2-4