Review Chemical Reactions

Which observation does not indicate a chemical rxn has taken place?

• formation of a precipitate

• production of gas

• production of heat and/or light

• freezing

Tags

NGSS.MS-PS1-2

A solid produced as a result of the reaction between two aqueous solutions is

• a precipitate

• a reactant

• a molecule

• a soluble product

Tags

NGSS.MS-PS1-2

What does the symbol "g" beside a formula in a chemical equation represent?

• the substance is a gas

• the chemical produces heat

• the chemical is dissolved

• the chemical is a catalyst in water

What type of reaction would occur when the reactants are Sn + AgN?

• synthesis

• decomposition

• single displacement

• double displacement

Tags

NGSS.MS-PS1-2

To balance a chemical equation it may be necessary to adjust the

• subscripts

• coefficients

Tags

NGSS.HS-PS1-7

A chemical equation is considered balanced when the

• coefficients of the reactants equal the coefficients of the products

• same number of each kind of atom appears in the reactants and products

• products and reactants are the same chemicals

• subscripts of the reactants equal the subscripts on the products

Tags

NGSS.MS-PS1-5

What type of change produces a new substance?

• physical

• chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What kind of change would melting be?

• physical

• chemical

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What kind of change would burning be?

• physical

• chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

You spray paint a calculator to yellow, this is an example of a _________ change.

• physical

• chemical