8th grade Science NC EOG Review

A student is asked to categorize the following items as elements, compounds, or mixtures: copper wire, salt, aluminum foil, baking soda, a piece of granite, and sugar water.  He lists ELEMENTS as copper wire, aluminum foil, and baking soda; COMPOUNDS as salt; MIXTURES as the piece of granite and sugar water.  Which is in the wrong category? 

• copper wire
• sugar water
• baking soda
• salt

Why is water classified as a compound?

• Because it is an element, which consists of only one type of atom.
• Because it is a substance, which can easily be separated.
• Because it is a substance composed of two or more kinds of atoms bonded together.
• Because it is an unevenly mixed solution, or a heterogeneous mixture.

Tags

NGSS.MS-PS1-1

A student is designing an experiment for the science fair.  She needs to find a material that conducts an electric current, and her teacher has provided her with samples of the following elements.  Which of them should she choose?

• argon
• copper
• fluorine
• phosphorous

The mass of the products in a chemical reaction is the same as the mass of the reactants in the reaction.  Which law best describes this statement?

• The Law of Conservation of Angular Momentum
• The Law of Superposition
• The Law of Conservation of Matter
• The Law of Entropy

Tags

NGSS.MS-PS1-5

Which is an example of a chemical reaction?

• a pot of water boiling
• an iron nail rusting
• a piece of ice melting
• a sugar cube dissolving in tea

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A scientist recognizes a white powder as sugar due to its white crystals and its sweet taste.  However, the scientist notices that the elements that make up the sugar - carbon, hydrogen, and oxygen - look nothing like sugar, nor are they sweet.  What is the best explanation for this?

• Sugar is a compound, and compounds usually have a different appear
• Sugar is an element, so its properties are unique.
• Sugar is a heterogeneous mixture, so its appearance is unique.
• Substances in nature change randomly and it is impossible to predict those changes.

Tags

NGSS.MS-PS1-1

Which statement supports the theory of evolution?

• All living cells come from previous cells.
• All plants and animals have DNA.
• Matter cannot be created or destroyed during chemical reactions.
• Fossils provide evidence that vertebrates share a common ancestor.

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

What is one way scientists analyze the health of a river?

• by measuring its depth
• by measuring the speed at which the river flows
• by measuring its dissolved oxygen
• by measuring the distance the river travels to reach an ocean

Tags

NGSS.MS-PS1-2

Which example BEST represents an interconnection between an aquatic food web and a terrestrial food web?

• Fish eat insects that land on the surface of a pond.
• Snakes eat bird eggs.
• Bats eat mosquitos.
• Mountain lions catch and eat deer.

Tags

NGSS.MS-LS2-2

What is one way the government of the United States attempts to reduce pollution in the oceans?

• create new desalination plants
• discontinue sewage treatment programs
• increase oil and gasoline production
• enforce laws limiting trash dumping

Tags

NGSS.MS-ESS3-3