Apply Its_Middle School Physical Science - Mastery Assess It_5

10/20/2016 Apply Its_Middle School Physical Science Mastery Assess It_5

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Mastery Assess It 5

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1. What makes water a polar molecule?

a. There is a slight negative charge near the hydrogen atoms and a slight negative charge near the oxygen atom. Great effort, but there is a slight positive charge near the hydrogen atoms in a water molecule. b. There is a slight positive charge near the hydrogen atoms and a slight negative charge near the oxygen atom.

You are correct! The differences in the charge of the atoms make water a polar molecule!c. There is a slight positive charge near the helium atoms and a slight negative charge near the oxygen atom.

Great effort, but helium is not an element of a water molecule. d. There is a slight positive charge near the carbon atoms and a slight negative charge near the oxygen atom.

Great effort, but carbon is not an element of a water molecule.

2. Which statement best describes the behavior of water molecules?

a. Water molecules are in constant motion. Correct! Water molecules are constantly in motion!b. Water molecules move intermittently.

Great effort, but water molecules move constantly.c. Water molecules are still.

Great effort, but molecules are rarely completely still, unless they are at extremely low temperatures.d. all of the answers listed are correct

Great effort, but at least one of the above answers is incorrect.

3. From the choices below, select the substance that is not a crystalline solid?

a. Coffee grinds Correct! Coffee grounds are made of materials that are not crystalline.b. Table salt

Great effort, but salt does have a crystalline structure. c. Sugar

Great effort, but sugar does have a crystalline structure. d. Epson salt

Great effort, but salt does have a crystalline structure.

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4. Which physical property has the ability to transmit light?

a. Luster Great effort, but luster is the ability to reflect light, not produce it.b. Structure

Great effort, but structure is not a function of light.c. Electrical conductivity

Great effort, but electrical conductivity is not a function of light. d. Luminescence

You are correct! Luminescence is a physical property that has the ability to transmit light!

5. Rocks can be crushed then sorted many times for which purpose?

a. Smaller rocks are used to make asphalt. This is one use of rocks. Are there any more?b. Rock dust and rock chips are used for landscaping.

This is one use of rocks. Are there any more?c. Gravel is used for pathways.

This is one use of rocks. Are there any more?d. all of the answers listed are correct

Correct! All of the options are uses for rocks.

6. A solute can return to its original state through which process?

a. Chromatography Great effort, but this is not the only way that a solute can return to its original state. b. Magnetic attraction

Great effort, but this is not the only way that a solute can return to its original state. c. Filtration

Great effort, but this is not the only way that a solute can return to its original state. d. all of the answers listed are correct

You are correct! All options are ways of returning solutes to their original state.

7. How should the water level in a graduated cylinder be measured?

a. by the meniscus

You are correct! To take an accurate measurement of water in a graduated cylinder, you should look at the meniscus, or the bottom of the curvedsurface of the water.

b. by the edge of the water closest to the side of the cylinder

Great effort, but you should measure the level of water in a graduated cylinder by looking at the bottom of the curved surface of the water, called themeniscus.

8. If a patient in the hospital is unable to eat or drink anything, what mixture might a doctor use to help hydrate and provide nutrients to a patient?

a. Saline solution Great effort, but this option would provide hydration, but not nutrients.b. Saline and dextrose solution

Correct! This option provides both nutrients and hydration!c. Dextrose

Great effort, but this option would provide nutrients, but not hydration.d. Sodium chloride

Great effort, but sodium chloride is salt. Too much salt in your system can kill you.



9. Centrifuges are commonly used in which type of laboratory? Choose all that apply.

a. chemical Centrifuges are used in chemical labs. Are they used in any other kind of labs?b. biological

Centrifuges are used in biological labs. Are they used in any other kind of labs?c. medical

Centrifuges are used in medical labs. Are they used in any other kind of labs?d. correct answer not shown

At least one of the options above is correct.

10. Sterile saline solution, which is typically used in the medical field, contains about how many grams of sodium chloride per liter of water?

a. 9 You are correct! Saline solution contains exactly 9 grams of sodium chloride per liter of water!b. 12

Great effort, but saline solution contains a less than 12 grams of sodium chloride per liter of water. c. 1

Great effort, but saline contains quite a bit more than 1 gram of sodium chloride per liter of water. d. 5

Great effort, but saline contains quite a bit more than 5 grams of sodium chloride per liter of water.

11. A scientist is trying to solve a crime. If a scientist wants to prove that a person was at the scene of a crime, which option would provide the mostsolid evidence?

a. Use a piece of hair from the suspect. Great effort, but a forensic scientist would need another hair for comparison from the crime scene.b. Use a piece of hair from the crime scene.

Great effort, but a piece of hair is nothing unless the owner can be located.c. Compare the DNA by using gel electrophoresis.

Correct! Comparing the DNA from both samples would be a good way to provide evidence.d. Extract the DNA from both samples of hair.

Great effort, and this is a good start, but there is a better way!

12. Identify the possible symptoms of eating MSG.

a. Dehydration Great effort, and while this is indeed a side effect of eating MSG, it is not the only one. b. Extreme sweating

Great effort, and while this is indeed a side effect of eating MSG, it is not the only one. c. Headache

Great effort, and while this is indeed a side effect of eating MSG, it is not the only one. d. all of these

Correct! All of the above are side effects!

13. Which of the following is NOT a physical property of matter?

a. pH You are correct! pH is a chemical property of matter!b. volume

Great effort, but volume, a measurement of how much space matter takes up, is a physical property.c. density

Great effort, but density, a measure of how tightly packed matter is in a given space, is a physical property.d. mass

Great effort, but mass, a measure of how much matter is contained in a substance, is a physical property.



14. Which method is used to get clumps out of a mixture?

a. Filtering Filtering removes liquids from mixtures. Clumps are a little bigger.b. Evaporating

Evaporating would involve dissolving the mixture in water. This would not remove the clumps.c. Crushing

Crushing would not remove the clumps. It would blend them into the mixture.d. Sifting

Correct! Sifting the mixture will separate the clumps from the rest.

15. Hardness is a chemical property that can be used to identify a substance.

a. True Great effort, but the statement is false. Hardness is a physical property that can be used to identify a substance. b. False

You are correct! The statement is false! Hardness is a common physical property of matter that can be used to identify a substance!

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