SC 8 P 9 3

Adding heat to a reaction would_______(SC.8.P.9.3)

• Cause it to stop

• Cause it to speed up

• Cause it to slow down

• Not effect it at all

Tags

NGSS.MS-PS1-4

Three examples of physical changes are ______________________.(SC.8.P.9.3)

• boiling of water, bursting of a balloon, and crumpling a piece of paper

• burning of gasoline, rotting of an egg, and exploding fireworks

• freezing of water, evaporation of gasoline, and rusting a nail

• sawing of wood, crushing a can, and toasting a marshmallow

Jack and Jill are doing an experiment in science class with baking soda and vinegar. Their teacher is happy with the results of their experiment; however, she wants to make sure that Jack and Jill can get the rest of their trials done before the end of class. What is one way that Jack and Jill can speed up the reaction without affecting the results? (SC.8.P.9.3)

• They can add more baking soda

• They can add ice to the vinegar

• They can do the experiment in front of a window

• They can do the experiment on a hot plate

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

As the temperature in a chemical reaction ________the reaction rate ______(SC.8.P.9.3)

• rises, lowers

• lowers, rises

• rises, rises

• none of the above

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the following is NOT an example of a chemical change? (SC.8.P.9.3)

• color changes

• shape changes

• bubbles are produced

• heat or light produced

Tags

NGSS.MS-PS1-2

Which of the following best describes how chemical changes differ from physical changes? (SC.8.P.9.2)

• Physical changes produce no new substances and chemical changes do.

• Physical changes always involve the formation of a gas while chemical changes may not.

• Physical changes can occur inside or outside the substance; chemical changes always occur outside.

• Physical changes involve a change of state; chemical changes involve a change of shape.

Joey is performing an experiment in science class. He mixes two liquids in a test tube, and gas bubbles appear at the surface of the test tube. What type of changes are most likely taking place? How do you know? (SC.8.P.9.2)

• Physical change because you can separate the mixture

• Physical change because it still is a liquid

• Chemical change because he used chemicals

• Chemical change because a gas formed.

Tags

NGSS.MS-PS1-2

How can the law of conservation of mass apply to a burning log, if all that remains of it is ash?

• The ash has the same mass as the log, although a large percentage of it blows away

• The law of conservation of mass applies to changes of state but not to chemical

  reactions

• The law of conservation of mass applies to substitution and displacement reactions but not to combustion reactions.

• The masses of the gases and water vapor released into the air by the reaction, plus the

  ash, equal the mass of the log before burning.

Tags

NGSS.MS-PS1-5

During a chemical reaction, matter cannot be __________ or created. (SC.8.P.9.1)

• Changed

• Destroyed

• Created

• Moved

Tags

NGSS.MS-PS1-5

Shelby filled three empty soda bottles with 5 g of steel wool, a material used for cleaning that also rusts quickly. She added 100 mL of water to each bottle and then resealed the bottle. She placed each bottle in one of three different locations: in a refrigerator at 3 °C, in a room at 25 °C, and in a warm kitchen at 30 °C. She observed the bottles every day for a week and recorded the amount of rust that formed on the steel wool. Which research question does this experiment best investigate?

• Does a gas form when steel wool rusts?

• Does the temperature in a room vary widely over time?

• Does the amount of water effect how quickly steel wool rusts?

• Does temperature affect the amount of rust that forms on steel wool?