Changes in Matter

Which of the following is an evidence of a chemical change?

• change in color

• formation of a precipitate

• temperature change

• production of a gas

• all of the above

Tags

NGSS.MS-PS1-2

Which of the following must happen and be true for ALL chemical changes?

• change in color

• formation of a precipitate

• production of a new substance or material

• production of gas

• change in temperature

Tags

NGSS.MS-PS1-2

During a chemical reaction...

• atoms of reactants are different from atoms of products

• molecules of reactants are the same as molecules of products

• atoms of reactants are the same as the atoms of products

• atoms of reactants transform into one type of atom in a product

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If the reactants of a chemical reaction include sulfur (S) and oxygen (O₃), the products will consist of...

• one sulfur atom and one carbon atom

• one sulfur atom and three oxygen atoms

• one carbon atom and two oxygen atoms

• on sulfur atom, one carbon atom, and two oxygen atoms

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

If there is no clear evidence of a chemical reaction, what could you do to determine if a chemical reaction did occur?

• look at the reaction under a microscope

• test and compare the properties of the reactants and products (i.e solubility, conductivity, etc.)

• change the color of the reaction by adding dye

• heat up the reaction using a hot plate

Tags

NGSS.MS-PS1-2

In a chemical reaction, the reactants are soluble, therefore...

• the products are also soluble

• at least one of the products must be insoluble

• solubility does not correlate with chemical reactions

• the products are conductive

during a chemical reaction, if the reactants are not conductive, then

• the products are conductive

• the products are also not conductive

• conductivity has no correlation with chemical reactions

• the products are soluble