NC 8th Grade Science EOG Review

What is a compound

• sodium

• sugar

• nitrogen

• air

Tags

NGSS.MS-PS1-1

Which is the best estimate of the melting point of Rubidium (Rb)?

• 25* C

• 40* C

• 75* C

• 184* C

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

This is a chemical reaction for the decomposition of carbonic acid into water and carbon dioxide.

How does this reaction support the Law of Conservation of Mass?

• Several molecules of water are produced.

• The mass of carbon atoms is reduced during the reaction.

• The mass of the atoms in the reactant equals the mass of the atoms in the products.

• The mass of hydrogen atoms is the only thing that remains the same before and after the reaction.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which is classified as an element?

• carbon dioxide

• iron

• vinegar

• water

Which best describes the sequence o the elements in Period 5 of the periodic table?

• highly reactive gases, relatively non reactive metals, metalloids, very nonreactive gases, nonreactive nonmetals

• highly reactive metals, relatively nonreactive metals, metalloids, reactive nonmentals, reactive gases

• nonreactive gases, metalloids, nonreactive metals, highly reactive metals, highly reactive gases

• nonreactive gases, nonreactive metals, highly reactive metals, metalloids, reactive nonmetals, reactive gases

Which statement is true about a chemical reaction?

• The physical states of the atoms in the reactants determine the products.

• Some of the atoms in the reactants will be a part of the products.

• The number of atoms in the reactants determines the products.

• All of the atoms in the reactants will be a part of the products.

Tags

NGSS.MS-PS1-5

Chlorine has 7 valence electrons. With what group of elements will chlorine most readily bond?

• group 1

• group 2

• group 16

• group 18

Tags

NGSS.MS-PS1-1

Which is the best example of a chemical change?

• butter melting

• egg cooking

• paper tearing

• water evaporating

Tags

NGSS.MS-PS1-2

Which chemical equation best represents the Law of Conservation of Mass?

•  $H\ +\ O\ \rightarrow\ H_2O$  
  

•  $H_2\ +\ O_2\ \rightarrow\ H_2O$  

•  $2H_2\ +\ O_2\ \rightarrow\ 2H_2O$  

•  $H_2\ +\ O_2\ \rightarrow\ 2H_2O_2$  

Tags

NGSS.MS-PS1-5

In some environments, wolves prey on deer for their source of food. If all of the wolves were taken from the environment, what would most likely happen to the deer population?

• The deer population would increase and begin to compete for food.

• The deer population would become larger and healthier animals.

• The deer population would decrease, because there would be an increase in disease.

• The deer population would change color, because they would not have to hide from wolves.

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-1