Q1 Practice Quiz 8th Grade

Sergio is learning about compounds. Which of the following best describes a compound?

• A substance made up purely of one element

• A group of substances that are either acids or bases

• A group of substances that can be separated by a physical change

• A substance made up of two or more elements that are chemically combined

Scientific theories are developed over time in all areas of science. Which statement best describes scientific theories?

• They are based on scientific laws that came first.

• They are pieces of scientific evidence that support a hypothesis.

• They are explanations of scientific events that may change based on continuous research.

• They are predictions of events that usually remain constant because scientific ideas rarely change.

Atoms are made up of subatomic particles, including neutrons. Which of the following describes a neutron?

• has a greater volume than the electron cloud

• has more mass than the nucleus

• has no charge

• has no mass

A space probe lands on a planet that has half the pull of gravity as Earth. What effect does this have on the space probe's weight and mass?

• Its weight is reduced to half its weight on Earth, and its mass remains the same as on Earth.

• Its weight remains the same as on Earth, and its mass is reduced to half its mass on Earth.

• Both its weight and mass are half of what they are on Earth.

• Both its weight and mass remain the same as on Earth.

Tags

NGSS.MS-PS2-4

Throughout history, scientific knowledge has changed. Which of the following resulted in an important change in scientific knowledge?

• the observation of phase changes of the Moon

• the discovery of the function of the DNA molecule

• the development of a hypothesis describing possible life on Mars

• the prediction of when a comet would be most clearly visible from Earth

Tags

NGSS.MS-ESS1-1

In 1980, a scientific journal published an article describing the observations that led to a hypothesis. The hypothesis stated that an asteroid striking Earth brought about the extinction of the dinosaurs. Which of the following would best provide support for a scientific hypothesis?

• opinions and personal beliefs

• new evidence and personal opinions

• new evidence and additional observations

• additional observations and informed predictions

Tags

NGSS.HS-LS4-5

A group of students slowly poured 100 mL of vegetable oil, 100 mL of colored water and 100 mL of corn syrup into a 500 mL beaker. The students observed the beaker after 5 minutes and recorded their observations. Which of the following are the students most likely trying to compare?

• the volume of the liquids

• the density of the liquids

• the weight of the liquids

• the color of the liquids

Jordan adds some soil and plants to a large glass jar to build a terrarium. He waters the plants and then adds two snails, two crickets, and an earthworm to the jar. Jordan then places the lid tightly on the jar and sets it on a sunny windowsill. Based on the law of conservation of mass, which of the following is expected to occur inside Jordan's terrarium?

• The mass will increase as the plants grow and decrease when the snails eat the plants.

• The mass will increase as the earthworm digests the soil.

• The mass will decrease when the crickets die.

• The mass will neither increase nor decrease.

Tags

NGSS.MS-PS1-5

An astronomer observes a sunspot. Which of the following describes this feature of the sun?

• a location where heat rises to the Sun's surface

• a location that produces most of the Sun's heat energy

• a location that is cooler than other parts of the Sun's surface

• a location where energy and matter leave the Sun's atmosphere

Scientists who investigate microscopic fossils are known as micropaleontologists. Which of the following would these scientists most likely study?

• the rocks that identify the location of ancient continents

• the evidence of changes in the climate of ancient Earth

• the different elevations of the surface of ancient Earth

• the rocks that contain evidence of ancient organisms

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2