Which is a compound?

• hydrogen

• Water

• air

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?

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

• 
  Atoms were destroyed in the mist.

• Some atoms escaped into the air.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is classified as an element?

• iron

• Water

• Salt

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

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

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

Tags

NGSS.MS-PS1-1

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

• 
  Group 1

• 
  Group3

• Group 2

Which is the best example of a chemical change?

• balloon popping

• crumpling up paper

• water evaporating

• a cake baking

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

To show a reaction that represents the Law of Conservation of Mass for

water H₂O?

(Clue: Balance the Equation)

• 2HO

• 2H₂O

• 3H0

• HO

Tags

NGSS.MS-PS1-5

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

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

• The fossil organism evolved independently in the 2 separate layers

• The deposition rate of the 2 layers was identical

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

Tags

NGSS.MS-ESS2-3

NGSS.MS-LS4-1

Which is the most accurate method scientists use to predict the age of the earth?

• Radioactive Dating

• Relative Dating

• Comparing the ages of fossils

• investigating core samples

Tags

NGSS.HS-ESS1-6