Chemical Equations & Solutions

The law of conversation of mass states...

• Mass can be created but never destroyed

• Mass can't be created or destroyed

• Mass is dependent on matter

• Mass can't be created but is destroyed in chemical reactions

Tags

NGSS.MS-PS1-5

knowing the law of conversation of mass, which of the following is true?

• Mass can be lost to the environment

• Mass is rearranged in chemical reactions

• Mass is relative

• Mass is only conserved in physical changes

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student is balancing an equation in her chemistry class. What fact is she using to check her work?

• The number of atoms on each side of the reaction arrow must be the same.

• The number of molecules on each side of the reaction arrow must be the same.

• The number of letters on each side of the reaction arrow must be the same.

• The number of atoms on each side of the reaction arrow must be different.

Tags

NGSS.MS-PS1-5

• Balanced

• Unbalanced

Tags

NGSS.MS-PS1-5

A chemical reaction takes place in a sealed container. Which of the following must be the same after the reaction has finished?

• Color

• Shape

• State of Matter

• Mass

Tags

NGSS.MS-PS1-5

An unknown element loses an electron to become positive and then bonds to a relatively negative element. The two elements have created

• A covalent polar bond

• A covalent nonpolar bond

• An ionic bond

• A metallic bond

Tags

NGSS.HS-PS1-3

An unknown element is located in group 13. This element wants to...

• Gain electrons

• Lose electrons

• Lose protons

• Gain neutrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following will not help a solute dissolve into a solvent

• Aggitation

• Adding metals

• Increasing the K.E. of the solution

• changing the surface area

In polar covalent bonds...

• Electrons are stolen

• Electrons are shared evenly

• Electrons are shared unevenly

• Electrons are transformed

In nonpolar covalent bonds...

• Electrons are shared evenly

• Electrons are shared unevenly

• Electrons are stolen

• Electrons are transformed