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Chemistry for Changing Times

Chemistry

Quiz 2 :

Atoms

Quiz 2 :

Atoms

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Which one of the following statements is NOT a correct statement of the Law of Conservation of Mass?
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Answer:

A

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Which of the following statements about atoms is NOT true?
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Answer:

D

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Leucippus and Democritus believed that all of the following statements about matter were true EXCEPT
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Answer:

C

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Lavoisier performed many of the same experiments as his predecessors. The one thing that most distinguished Lavoisier's work was
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The "father of modern chemistry" is
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The Greek word atomos means
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The ancient Greeks believed that matter was composed of four basic elements. Which one of the following was NOT one of the four?
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Which philosopher believed that matter was continuous and was not made up of atoms?
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A student measures 10.5 g of mercury(II) oxide into an open test tube and heats the tube. The heat causes the mercury(II) oxide to decompose into mercury and oxygen. After reaction, the student finds the mass of the contents of the tube to be 9.7 g. Which one of the following describes these observations?
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Approximately how many elements occur naturally on Earth?
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A mixture containing 50 grams of carbon and 75 grams of oxygen is sealed in a flask. The total mass of the system is 225 grams. The flask is heated to cause the carbon and oxygen to react. The sealed flask is massed. What is the mass of the sealed flask?
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The amount of carbon on the earth, including the atmosphere,
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How many years ago was an atomic view of matter was first proposed?
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32 g of sulfur will react with 48 g of oxygen to produce 80 g of sulfur trioxide. If 16 g of sulfur and 100 g of oxygen are placed into a sealed container and allowed to react, what is the mass of the material in the container after the reaction is completed?
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Hydrogen peroxide decomposes into water and oxygen when exposed to heat or light. A tightly capped bottle of hydrogen peroxide is placed on a mass scale (a balance) and exposed to light for three weeks. The mass reading on the scale does not change. This is an example of
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The amount of aluminum on the earth today relative to the amount 100 years ago when Al was first commercially extracted from bauxite, an aluminum containing ore,
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Leucippus and Democritus proposed the "first" atomic view of matter. They arrived at this view based on
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32 g of sulfur will react with 48 g of oxygen to produce 80 g of sulfur trioxide. If 16 g of sulfur and 100 g of oxygen are placed into a sealed container and allowed to react, what is the mass of sulfur trioxide in the container after the reaction is completed?
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By definition, which of the following can be broken down into simpler substances?
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Lavoisier measured the mass of substances before and after chemical reactions and summarized his observations in a(n)
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