Pretest Review 8.3.2

Mary and John were conducting an experiment to determine the effect of temperature on how fast milk spoils. Half of the milk was placed in the refrigerator, while they placed the other half of the milk on the counter. Which of the following statements best explains the outcome of their experiment?

• The cooler temperature increases how fast the milk spoils.

• The warmer temperature increases how fast the milk spoils.

• The cooler temperature has no effect on how fast the milk spoils.

• The warmer temperature has no effect on how fast the milk spoils.

Tags

NGSS.MS-LS1-5

Dennis investigated physical and chemical changes in science class and then classified his changes into two columns shown below.

Which of the following statement best describes the information in the table?

• Column B represents physical changes because they cannot be reversed.

• Column A represents chemical changes because new substances are formed.

• Column A represents physical changes because the original substances have not changed.

• Column B represents chemical changes because the shape of the substances has changed.

Tags

NGSS.MS-PS1-2

Ernest is observing and measuring the properties of a substance. He heats the substance and

observes that the substance turns from a blue cube to a gray powder. He then measures the

properties of the gray powder and compares them to the properties of the blue cube. He

finds that the properties of the blue cube and gray powder are different. Which option below

best summarizes his observation?

• The blue cube changed color and size when he added heat, which means he observed a physical change.

• The blue cube became a new substance when he added heat, which means he observed a physical change.

• The blue cube became a new substance when he added heat, which means he observed a chemical change.

• The blue cube changed color when he added heat, which means matter was destroyed by a chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Which option below accurately describes the correct arrangement of physical and chemical changes?

• Baking brownies is a physical change. Mixing the flour and sugar in a bowl for the brownies  is a chemical change.

• Sticks are burnt in a fire to produce a physical change. Sticks are broken into pieces to produce a chemical change.

• Potatoes are chopped and put into a salad as a physical change. Potatoes are chopped and cooked on the stove is a chemical change.

• Two pale liquids are mixed and a yellow mixture is formed which is a physical change. Blue and yellow paint is mixed to form green paint is a chemical change.

Tags

NGSS.MS-PS1-2

Mrs. Smith decides to do a demonstration for her class with a piece of charcoal. Using a balance, Mrs. Smith determines that the mass of the charcoal is 20 grams (g). She then takes the piece of charcoal and crushes it into a fine powder and measures the mass of the powder. What would be the result of Mrs. Smith's demonstration?

• The mass of the powder would be less than the mass of the charcoal because of a change of state.

• The mass of the powder would be less than the mass of the charcoal because of a change in particle size.

• The mass of the powder would be greater than the mass of the charcoal because of a change in shape of the matter.

• The mass of the powder would be the same as the mass of the charcoal because the matter changed in size but not amount.

Alison has completed an experiment in her science class. The procedure she followed is

below.

1. Measure the total mass of a sample of baking soda, a zipper bag, and two plastic cups

2.  Add the baking soda to a plastic cup.

3. Add Vinegar into the second cup.

4. Place both cups into the zipper bag

 5. Pour the baking soda into the vinegar and observe the bag.

6.  Measure the total mass of the system again.

What statement below best describes the results she will find?

• The total mass will be different because a chemical change occurred.

• The total mass will not be different because a physical change occurred.

• The total mass will be different because some gas is destroyed during the change.

• The total mass will not be different because the total mass is conserved during the change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Two samples of water at different temperatures are shown below:

An Antacid  tablet is dropped into each sample of water at the same time and a timer is started to measure the rate of reaction. Which statement below best describes what should be expected in this investigation?

• Sample A will have an increased rate of change because the temperature in Sample A is lower than in Sample B.

• Sample B will have an increased rate of change because the temperature in Sample B is lower than in Sample A.

• Sample A will have an increased rate of change because the temperature in Sample A is greater than in Sample B.

• Sample B will have an increased rate of change because the temperature in Sample B is greater than in Sample A.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS3-4

Principal Agudo asked Jamani to explain what he was learning about in science class. Jamani decided that a demonstration would be best, so he safely lit a candle, and they observed what happened. What statement would best describe the outcome of Jamani’s demonstration?

• A physical change occurred and mass and matter was created.

• A physical change occurred and mass and matter was conserved.

• A chemical change occurred and mass and matter was destroyed.

• A chemical change occurred and mass and matter was conserved.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When a substance in a closed system changes from a solid to a gas, which of the following describes the mass of the changed substance?

• The mass increases.

• The mass decreases.

• The mass becomes zero.

• The mass does not change.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Which of the following correctly describes an example of the Law of Conservation of Mass?

• An unlit candle has a greater total mass than after it has been lit.

• As the jello in a container becomes more solid, the mass of the jello increases.

• After a piece of bread goes bad and changes color, its total mass decreases.

• After a stick has burned and turned to ash, the total mass does not change.

Tags

NGSS.MS-PS1-5