Apply Its_Middle School Physical Science - Mastery Assess It_6

10/20/2016 Apply Its_Middle School Physical Science Mastery Assess It_6

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Mastery Assess It 6

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1. The equation shows a summary of the chemical reactions of photosynthesis.

What is missing from the product side of the equation?

a. 2 water molecules

b. 6 carbon atoms

c. 12 hydrogen atoms

d. 12 oxygen atoms

2. Which of the following is an example of a base?

a. lemon Great effort, but lemons are acidic!b. soap

You are correct! Soap is a base, which is why it is good at removing dirt and grease!c. vitamin C

Great effort, but, believe it or not, vitamin C is an acid!d. lime

Great effort, but a lime is acidic!

3. Which is an example of a chemical reaction?

a. the pressure of heating and cooling air molecules Chemical reactions change the chemical properties of the substance. Is this a good example?b. wind blowing

Chemical reactions change the chemical properties of the substance. Is this a good example?c. ice melting into water

Chemical reactions change the chemical properties of the substance. Is this a good example?d. photosynthesis

Correct! Photosynthesis is indeed a chemical reaction!

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4. When water mixes with ammonium nitrate, which of the following is true?

a. This is a chemical reaction that is endothermic. Correct! The substance has changed chemically, and heat is released, which happens in an exothermic reaction.b. This is a physical reaction that is exothermic.

Great effort, but chemical reactions change the chemical properties of the substance. Physical reactions do not.Endothermic means that heat is absorbed. Exothermic means that heat is released.

c. This is a chemical reaction that is exothermic.


d. This is a physical reaction that is endothermic.


5. Choose all of the substances that are bases.

a. dishwashing soap Great effort! Dish soap is a base, but it is not the only one listed. b. laundry detergent

Great effort! Laundry soap is a base, but it is not the only one listed. c. shampoo

Great effort! Shampoo is a base, but it is not the only one listed. d. vitamin C

Great effort, but vitamin C is also known as ascorbic acid.

6. Which substance is probably the least acidic?

a. orange juice Great effort, but orange juice is not the least acidic substance here.b. milk

Correct! Milk is not very acidic.c. lemon juice

Great effort, but lemon juice is very acidic.d. vinegar

Great effort, but vinegar is not the least acidic substance.

7. Choose all of the following household products that are harmful to humans or animals.

a. antifreeze Antifreeze is harmful to humans and animals. Is it the only one?b. mothballs

Mothballs are harmful to humans and animals. Are any of the other substances harmful?c. chlorine bleach

Chlorine is harmful to humans and animals. Is it the only one?d. ammonia

Ammonia is harmful to humans and animals. Is it the only one?

8. What happens when baking soda, dish soap, and vinegar are added together?

a. A physical and a chemical reaction occur. Great effort, but there is no evidence of a physical change.b. A chemical reaction occurs.

Correct! A chemical reaction has occurred!c. No reaction occurs.

Great effort, but a reaction does indeed occur. What type is it?d. A physical reaction occurs.

Great effort, but there is no evidence of a physical change.



9. Choose the best example of a chemical property.

a. shape Great effort, but remember, physical properties do not change the chemical properties of the substance.b. weight

Great effort, but remember, physical properties do not change the chemical properties of the substance.c. texture

Great effort, but remember, physical properties do not change the chemical properties of the substance.d. flammability

Correct! Flammability would change the chemical properties of the substance.

10. Chemical reactions result in the formation of a new substance with the same physical and chemical properties after two or more substances arecombined.

a. True

Great effort, but the statement is false. A chemical reaction will result in the formation of a new substance with different physical and chemicalproperties.

b. False You are correct! A chemical reaction involves the production of new substances with different physical and chemical properties!

11. Why is the mass of product always equal to the mass of the reactants in a chemical reaction?

a. because of Boyle's law Great effort, but Boyle's law explains the relationship between temperature and pressure. b. because of the law of conservation of mass

You are correct! Because of the law of conservation of mass, which states that matter can neither be created nor destroyed, so the mass of thereactants will always be equal to the mass of the product in any chemical reaction!

c. because of the law of universal gravitation Great effort, but the law of universal gravitation explains why all matter is attracted to other matter. d. because of Archimedes' principle

Great effort, but Archimedes' principle explains the upward force applied to a body in a fluid.

12. A chemical reaction is accompanied by the production of which of the following? Select all that apply:

a. change in shape Great effort, but change in shape is not usually considered to be indicative of a chemical reaction. b. change in color

You are correct! A change in color is usually indicative of a chemical reaction!c. change in odor

You are correct! A change in odor is usually indicative of a chemical reaction!d. production of gas

You are correct! The production of gas is usually indicative of a chemical reaction!e. change in temperature

You are correct! A change in temperature is usually indicative of a chemical reaction!

13. Which statement BEST describes the change to an ice cube as it melts?

a. The change is physical because the substance remains the same.

b. The change is chemical because ice has a lower density than water.

c. The change is chemical because water has a different pH than ice.

d. The change is physical because the mass remains the same.



14. Which example is a physical change?

a. Milk turns to sour milk. Great effort, but a physical change does not change what the substance is chemically.b. Paper burns and turns to carbon.

Great effort, but a physical change does not change what the substance is chemically.c. Water freezes and turns to ice.

Correct! Water is still the same chemically, even if it is ice or steam.d. Iron turns to rust.

Great effort, but a physical change does not change what the substance is chemically.

15. Who was "The Father of Modern Chemistry?"

a. Robert Boyle Great effort, and Robert Boyle made huge contributions to chemistry, but he is not credited with being the "Father of Modern Chemistry."b. Isaac Newton

Great effort, but Isaac Newton was the "Father of Phsyics."c. Gregor Mendel

Great effort, but Gregor Mendel was the "Father of Genetics."d. Antoine Lavoisier

You are correct! Lavosier's law of conservation of mass revolutionized the world's understanding of matter and how it interacts with other matter!

16. Which of the following examples provide proof that a chemical change has occurred?

a. color change This is an indicator of a chemical change. Is it the only one?b. formation of a precipitate

This is an indicator of a chemical change. Is it the only one?c. production of gas

This is an indicator of a chemical change. Is it the only one?d. change in temperature

This is an indicator of a chemical change. Is it the only one?

17. Sodium sulfate and barium chloride react with each other to form sodium chloride and barium sulfate as shown.

Which statement MOST accurately describes the mass of the reactants compared to the mass of the products?

a. The reactants have a greater mass because some of the mass was converted to heat.

b. The products have a greater mass because matter was created during the reaction.

c. The mass of the reactants is the same as the mass of the products.

d. The reactants have a greater mass because some matter was destroyed by the reaction.



18. When baking soda, calcium chloride, and water are combined in a zipclose bag, a chemical reaction occurs. From the choices below, select theone that does NOT correctly describe the chemical reaction.

a. When you add calcium chloride and baking soda to water, you produce calcium carbonate.

Great effort, but this is the equation for the chemical reaction: baking soda NaHCO3(s) + calcium chloride CaCl2(s) > calcium carbonateCaCO3(s) + salt NaCl(aq) + hydrochloric acid HCl(aq), then baking soda NaHCO3(s) + hydrochloric acid HCl(aq) > water H2O(l) + carbondioxide CO2(g) + salt NaCl(aq). Identify the substances being produced, and figure out which option is incorrect.

b. When you add calcium chloride and baking soda to water, you produce sodium chloride.


c. When you add calcium chloride and baking soda to water, you produce table salt, water, and carbon dioxide gas.


d. When you add calcium chloride and baking soda to water, you produce sodium dioxide and carbon dioxide gases. Correct! No sodium dioxide gas is produced!

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Apply Its_Middle School Physical Science - Mastery Assess It_6