Clues of a Chemical Reaction

Which of the following is ALWAYS produced in a chemical change (but not a physical change?)

• a compound

• a reversible change

• a new substance

• an element

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Check any answer(s) that are chemical reaction clues.

• expected color change

• fizzing due to a gas

• precipitate formation

• temperature increase/decrease

Tags

NGSS.MS-PS1-2

Which of the following is NOT an example of a chemical reaction?

• burning a piece of firewood

• an apple slice turning brown

• yellow and blue liquids producing green liquid

• milk and vinegar produce a chunky solution

Tags

NGSS.MS-PS1-2

Which of the following clues of a chemical change prove that a chemical reaction is occurring in the image?

• temperature change

• precipitate formation

• unexpected color change

• gas production

Tags

NGSS.MS-PS1-2

Which of the following is NOT a chemical change?

• oxygen (O) and iron (Fe) produce rust

• red Koolaid crystals and water produce a red solution

• solid baking soda and liquid vinegar cause fizzing

• Na (sodium) + Cl (chloride) --> NaCl (salt)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which statement explains why two dangerous elements (Na & Cl) can react to produce an edible substance (NaCl?)

• chemical reactions produce new substances that always have the same properties

• chemical reactions change color, mass, or volumes of the new substances

• chemical reactions produce a new substance with different properties

• chemical reactions result in the same substance with some different properties

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which clue of a chemical reaction is shown in the image?

• temperature change

• precipitate formation

• expected color change

• light or sound production

Tags

NGSS.MS-PS1-2

Which of these is NOT a common type of chemical change?

• oxidation (Statue of Liberty turned green)

• flammability (a match burns)

• size change (a head is shaved)

• reactivity (bleach discolors a towel)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Professor snape creates polyjuice potion. Why is this a chemical reaction?

• It is reversible and produced the same substance.

• It is irreversible and produced the same substance.

• It is reversible and produced a new substance.

• It is irreversible and produced a new substance.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which clues of a chemical reaction do glow sticks display?

• temperature change

• precipitate formation

• light production

• gas generation

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5