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physics/astronomy quiz 6

Question # 00601514
Subject: Astronomy
Due on: 10/10/2017
Posted On: 10/10/2017 02:59 AM

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Question 1 

Rusting of an iron nail is an example of a change of phase.

True/False

Question 2

Which of the following amounts is closest to the molar mass of C18H25NO?

1.9419 kg

200 g

128.44 g

1.30 lbs

Question 3 

Occasionally an asteroid will break into fragments due to a collision. These fragments, which often contain ice, can leave the asteroid belt and even make their way to Earth. Upon entering the Earth's atmosphere, such a fragment is heated to high temperature by frictional forces. Ice contained within a fragment typically liquefies or vaporizes. This type of change is considered a chemical change.

True/ False

Question 4 

The following chemical equation is not balanced: A + R2 ? A2R3. After balancing, this chemical equation is ____ .

4A + 3R2 ? 2A2R3

2A + R2 ? A2R3

A4 + R6 ? A4R6

A2 + R3 ? A2R3

Question 5 

Burning gasoline is an example of a physical change.

True/False

Question 6 

During a chemical reaction, atoms in the reactants rearrange their chemical bonds to make products. The new arrangement of bonds does not have the same total energy as the bonds in the reactants. Therefore, when chemical reactions occur, _____

energy is always released.

there will never be an accompanying energy change. Any change would violate the law of energy conservation.

energy is always absorbed.

there will always be an accompanying energy change.

Question 7 

Which of the following does not affect the rate of a reaction?

molar mass

surface area

temperature

catalyst

Question 8 

Given the following reaction: N2H4 ? 2H2 + N2, how many moles of H2 will be produced if 3.10 moles of N2H4 react?

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Question 9 

How many moles of caffeine are there in 378.0 g of caffeine?

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Question 10 

41.0 grams of F2 react according to the following balanced chemical equation: F2 + 2NaI ? I2 + 2NaF. As a result of this reaction _____ grams of I2 are produced.

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.


Tags quiz physicsastronomy energy answer following chemical change report includeunits numerical equation enter decimal bonds reaction make reactants does a2r3 moles temperature n2h4 fragment truefalsequestion example fragments grams placesquestion accompanying changequestion 7nbspwhich conservation

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physics/astronomy quiz 6

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Tutorial Preview …+ xx ? xxxx A4 + xx ? A4R6 xx + xx x A2R3 xxxxxxxx 5 Burning xxxxxxxx is an xxxxxxx of x xxxxxxxx change xxxx Correct Response xxxxx Question 6 xxxxxx a xxxxxxxx xxxxxxxxx atoms xx the reactants xxxxxxxxx their chemical xxxxx to xxxx xxxxxxxx The xxx arrangement of xxxxx does not xxxx the xxxx xxxxx energy xx the bonds xx the reactants xxxxxxxxxx when xxxxxxxx xxxxxxxxx occur, xxxxx energy is xxxxxx released there xxxx never xx xx accompanying xxxxxx…
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