3.01

Signs of a chemical change could be:

• change in energy (temperature, light, sound

• 
  formation of gas (bubbles)

• a precipitate forms (a solid forms from 2 liquids)

• change in color

• all of these

Tags

NGSS.MS-PS1-2

Bubbles form when two or more substances are combined ...

• Chemical Change

• Physical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a covalent bond, one or more electrons are

• shared

• gain

• lost

• not given

what two types of atoms make a covalent bond?

• 2 nonmetals

• 2 metals

• 1 nonemetal and 1 Metal

• 2 Noble Gases

According to the octet rule most elements need ____ valence electrons

• 2

• 6

• 8

• 18

Tags

NGSS.HS-PS1-1

The law of conservation of mass state that matter

• cannot enter nto chemical reactions

• cannnot form different substances

• cannot be cresated or destroyed

• cannot be modeled

Tags

NGSS.MS-PS1-5

The large numbers before a chemical formula that are used as multipliers are known as __________________.

• element symbols

• exponents

• coefficients

• subscripts

The materials we start with in a reaction are known as __________________.

• chemicals

• products

• reactants

• creations

The materials we end with in a reaction are known as __________________.

• chemicals

• products

• reactants

• creations

Tags

NGSS.MS-PS1-5

• chemical formula

• chemical equation

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5