Q3 - Friday Quiz 1 - Properties & Changes of Matter

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

• digesting food

• cooking an egg

• water evaporating from a rock

• a metal bike reacting with oxygen and turning red

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Ashley wants to compare the solubility of three materials: salt, sand, and flour. She fills three beakers with 500 mL of water each. She then adds the same amount of each solute to the beaker. The picture below shows the particles left after mixing.

Based on Ashley’s observations, what statement can she make about the solubility of the three materials?

• Sand is more soluble than salt and flour.

• Flour is more soluble than salt and sand.

• Sand is the least soluble when compared to flour and salt.

• Salt is the least soluble when compared to flour and sand.

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Ethan is observing and measuring the properties of a substance. He heats the substance and observes that the substance turns from a brown solid to a black powder. He then measures the properties of the black powder and compares them to the properties of the brown solid. He finds that the properties of the brown solid and black powder are different. Which option below best summarizes Ethan's observation?

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

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

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

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

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When a substance in a closed system changes from a liquid 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.

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Kayla combines a black liquid and a clear liquid. She observes that the two liquids do not mix. Kayla allows the mixture to settle for 30 minutes.

Which of the statements below best describes the properties of the two liquids?

• The clear liquid is less dense than the black liquid.

• The clear liquid is more dense than the black liquid.

• The volume of the clear liquid is less than the black liquid.

• The volume of the clear liquid is greater than the black liquid.

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The table below shows the same chemical change conducted at different temperatures.

Which trial would result in the slowest chemical change?

• Trial A

• Trial B

• Trial C

• Trial D

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James fills a graduated cylinder with 50 mL of water. He then drops a 60g key into the graduated cylinder. The water level inside the graduated cylinder rose to 53 mL as shown below.

If Density = Mass / Volume, what is the density of the key ?

• 60 g/mL

• 20 g/mL

• 2.05 g/mL

• 0.05 g/mL

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Ernesto is given two samples of wood as shown below.

He needs to determine if the samples are the same type of wood. Which property should Ernesto measure?

• The mass because it will depend on the size of the sample.

• The volume because it will depend on the size of the sample.

• The weight because it does not depend on the size of the sample.

• The density because it does not depend on the size of the sample.

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A principal wants to replace the playground equipment after several students complained of suffering burns on a hot day. The table provides information on several material options.

Which material should the principal choose to prevent future burns?

• Iron because it is the strongest due to its density.

• Stainless steel because it has the greatest density.

• Plastic because it has the lowest thermal conductivity.

• Aluminum because it has the greatest thermal conductivity.

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Which of the following best describes density?

• The amount of matter an object contains

• The amount of volume an object takes up

• The amount of gravitational force acting on an object

• The amount of matter within a specific amount of volume

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