123s of Chemistry Review

cutting down a tree is an example of a:

• physical change

• chemical change

photosynthesis is an example of a:

• physical change

• chemical change

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

NGSS.MS-PS1-5

making a sand castle is an example of:

• physical change

• chemical change

an apple turning brown is an example of:

• physical change

• chemical change

Tags

NGSS.MS-PS1-2

coloring is an example of:

• physical change

• chemical change

The substance that is made AFTER a chemical reaction has occurred is known as the __________________. It is found to the right of the yield sign (arrow).

• product

• reactant

• mass

• stuff

Tags

NGSS.MS-PS1-5

The ____________ tells us how many ATOMS are needed in the equation.

• subscript

• coefficient

• product

• mass

One molecule of hydrogen peroxide contains 2 HYDROGEN AND 2 OXYGEN atoms. The chemical formula for hydrogen peroxide is:

• H₂O

• HO₂

• H O

• H₂O₂

Tags

NGSS.MS-PS1-1

Water (H₂O) is made up of the elements:

• helium and carbon

• hydrogen and oxygen

• sodium and chlorine

• hydrogen and chlorine

Tags

NGSS.MS-PS1-1

In a chemical symbol:

• all the letters are capitalized

• only the first letter of the symbol is capitalized

• none of the letters are capitalized

• scientists do not use letters in a chemical symbol