8th grade Science EOG Review Part 1

Which is a compound?

• hydrogen

• air

• sugar

• calcium

Tags

NGSS.MS-PS1-1

Two different liquids are poured together. Bubbles and a mist forms. A few minutes later, the solution is weighed, and the weight is less than before the liquids were mixed. Why?

• Atoms were destroyed in the mist.

• Atoms became lighter when they turned into a gas.

• Some atoms escaped into the air.

• Some of the atoms became brand new substances that weigh less.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

• The product is greater than the reactant

• The product is less than the reactant

• The product is equal to the reactant

• The product destroyed the reactants.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which of the following is classified as an element?

• iron

• Salt

• water

• air

Which best describes the seqence of the elements in Period 5 of the Periodic Table?

• Highly reacive gases, relatively nonreactive metals, reactive gases, nonreactive metals

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

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

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

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

• Group 1

• Group 2

• Group3

• Group 7

Which is the best example of a chemical change?

• balloon popping

• crumpling up paper

• water evaporating

• a cake baking

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Fill in the blanks to show a reaction that represents teh Law of Conservation of Mass.

​ (a)   ​ ---> ​ (b)  

​

Tags

NGSS.MS-PS1-5

A geologist identifies the identical index fossils in rock layers from 2 different areas. What can be concluded?

• The deposition rate of the 2 layers was identical

• The fossil organism evolved independently in the 2 separate layers

• The two rock layers were deposited at approximately the same time.

• The index fossils will also occur in sediment deposited on top of these layers.

Tags

NGSS.MS-LS4-1

Which supports the theory that the same mountains were once at the bottom of the ocean?

• There are underwater mountains on the ocean floors today.

• Freshwater rivers flow to the ocean

• Fossils of marine organisms are found on top of some mountains

• Moth mountains and ocean floors have similar minerals

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3