8th Grade Science EOG

If a substance is composed of one type of atom that is arranged in one particular way, how is this substance best classified

• element

• compound

• mixture

• gas

Tags

NGSS.MS-PS1-1

In the current model of the Periodic Table of Elements, the elements have been placed in groups or families. Why have the elements been organized in such a way?

• Elements in each group have similar densities.

• Elements in each group all have similar boiling points.

• Elements in each group have similar physical and chemical properties.

• Elements in each group have the ability to chemically react with the other elements within that group.

A science teacher mixes calcium chloride and vinegar in a test tube. He passes the test tube around for his students to feel. The students notice that the test tube is hot. The science teacher asks the students to decide if the mixing of the two chemicals involved a physical or chemical change. He also asks the students to justify their answer. Which student gave the correct response?

• Student 1: The change was physical because a temperature change occurred.

• Student 2. The change was chemical because a temperature change occurred.

• Student 3: The change was physical because the two chemicals mixed.

• Student 4: The change was chemical because the two chemicals mixed.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

A scientist performed an investigation using the following substances:

Based on the investigation and the packing of sample C, which measurement would most likely be the mass of the crystal?

• 25 grams

• 71 grams

• 110 grams

• 117 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is a concern related to the production of electricity using nuclear power?

• Nuclear power produces too much excess heat and causes global warming.

• Nuclear power produces radioactive wastes that are difficult to eliminate.

• Nuclear power is not as efficient in producing electricity as are other forms of energy.

• Nuclear power plants take up too much space for the amount of electricity they produce.

Tags

NGSS.HS-ESS3-4

The U.S.A. and other countries are often promoting the conservation of electricity and fossil fuels. Which is an advantage of these conservation efforts?

• Conservation will allow electricity to be produced more cheaply.

• Conservation will help scientists find more uses for nonrenewable resource.

• Conservation will give scientists more time to find renewable alternatives to produce electricity.

• Conservation will provide all people on Earth access to electricity.

Tags

NGSS.MS-ESS3-3

NGSS.MS-ETS1-1

How are estuaries connected to oceanic organisms?

• Estuaries provide a nursery founds for oceanic organisms

• Estuaries provide sunlight for oceanic organisms.

• Estuaries provide primary food for oceanic organisms.

• Estuaries provide excess dissolved oxygen for oceanic organisms.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4

How would excessive increases in nitrate and phosphorus concentration affect freshwater systems?

• It would cause excessive algal blooms.

• It would cause increased dissolved oxygen.

• It would cause increased water clarity.

• It would cause extremely cold water.

Tags

NGSS.MS-LS2-4

If your community was planning to build a new sanitary landfill, what would be the most important environmental consideration in locating the landfill?

• cost of the land

• location of the groundwaer

• proximity to an industrial park

• accessibility to a major highway

Tags

NGSS.MS-ESS3-1

NGSS.MS-ESS3-3

This diagram shows a cross section of land that has not been overturned and includes a fossil. What can be concluded about the age of the fossil?

• It is younger than the shale.

• It is older than the shale.

• It is older than the sandstone.

• It is younger than the sandstone.

Tags

NGSS.MS-ESS1-4