Norman: 6.6E: Evidence of Chemical Changes

Which of the following is always true about a chemical change?

• It only changes the shape of a substance.

• It results in the formation of a new substance.

• It is always reversible.

• It only changes the temperature.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the term for a solid that forms when two liquids react chemically?

• Solution

• Precipitate

• Solvent

• Gas

Which of the following is NOT evidence of a chemical change?

• Change in color

• Change in shape

• Production of a gas

• Formation of a precipitate

Tags

NGSS.MS-PS1-2

What does the presence of bubbles during a reaction usually indicate?

• A physical change

• Production of a gas

• Formation of a solid

• Change in mass

Tags

NGSS.MS-PS1-2

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

• Melting ice

• Dissolving sugar in water

• Burning wood

• Breaking glass

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A clogged drain due to hard water is an example of which evidence of a chemical change?

• Color change

• Production of a gas

• Production of a precipitate

• Change in temperature

Tags

NGSS.MS-PS1-2

Which of the following is a sign that a chemical reaction has produced a new substance?

• The substance is cut into pieces.

• The substance changes color.

• The substance is mixed with water.

• The substance is frozen.

Tags

NGSS.MS-PS1-2

If two clear liquids are mixed and the solution turns yellow, what evidence of a chemical change is this?

• Production of a gas

• Change in temperature

• Color change

• Formation of a precipitate

Tags

NGSS.MS-PS1-2

Which of the following is an example of a chemical change involving temperature?

• Water boiling

• Ice melting

• Vinegar and baking soda reacting and getting cold

• Salt dissolving in water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS3-4

A student observes bubbles and a new smell when mixing two substances. What can the student conclude?

• Only a physical change has occurred.

• A chemical change has likely occurred.

• The substances have evaporated.

• The substances have frozen.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5