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3 years ago

A hot sun warms the surface of a lake on a calm day. What will happen to the cold water at the bottom of the lake?

Chemistry

2 answers:

Shkiper50 [21]3 years ago

8 0

Answer:

the answer is is the warm water at the top will sink down and mix with the cold water at the bottom

Juli2301 [7.4K]3 years ago

3 0

Answer:

C:the cold water will remain at the bottom and won't mix very much with the warm water at the top because warm and cold water don't mix

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I am fueled by the warm water of the ocean. As the warm water evaporates it rises until there is an enormous amount of heated mo

DedPeter [7]

It's a definitely a hurricane.

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3 years ago

Which of these is the best definition of a fuel cell?

oksian1 [2.3K]

Answer:

A voltaic cell that uses the oxidation of a fuel to produce electricity

Explanation:

A fuel cell is a voltaic cell that converts the chemical energy of a fuel and an oxidizing agent into electricity.

A. is wrong. This definition is so broad that it could include a candle in a cup.

C is wrong. The batteries in flashlights and cell phones are not fuel cells.

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3 years ago

*What type of circuit is this in the picture?

galben [10]

Answer:

B: parallel

Explanation:

because a parallel circuit has two or more paths for current to flow through. Voltage is the same across each component of the parallel circuit. The sum of the currents through each path is equal to the total current that flows from the source.

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2 years ago

Which of the following would form an anion? He H N B

vagabundo [1.1K]

<h3><u>Answer;</u></h3>

Nitrogen (N)

<h3><u>Explanation;</u></h3>

Atoms may lose or gain electrons to achieve stability. Metal atoms lose electrons to attain stable configuration, and as a result they form positively charged ions called cations.
<u>Non-metals on the other hand gain electrons to attain stable configuration, and as a result form negatively charged ions called anions.</u>
<u>Among the elements given above nitrogen (N) gains electrons to form a negatively charged ion called anion. </u>

4 0

3 years ago

Read 2 more answers

Instead of using ratios for back titrations we can also use molarities, if our solutions are standardized. A 0.196 g sample of a

kvv77 [185]

Answer:

The mass percent of Al(OH)₃ is 15.3%

Explanation:

The reaction is:

Al(OH)₃ + 3HCl = AlCl₃ + 3H₂O

The excess acid is neutralized with a solution of sodium hidroxide, in the reaction:

NaOH + HCl = NaCl + H₂O

The total moles of HCl is:

$n_{HCl,total} =M_{HCl} *V_{HCl} =0.111*0.025=2.78x10^{-3} moles$

From the second titration, the moles of excess of HCl is:

$n_{HCl,excess} =n_{NaOH} =M_{NaOH} *V_{NaOH} =0.132*0.01105=1.46x10^{-3} moles$

The difference between the total and excess of HCl, it can be know the moles that reacts with the aluminum hydroxide, is:

$n_{HCl,reacts} =n_{HCl,total}-n_{HCl,excess} =2.78x10^{-3} moles-1.46x10^{-3} moles=1.32x10^{-3} moles$

The ratio between HCl and Al(OH)₃ is 3:1. The MW for aluminum hydroxide is 78 g/mol, thus:

$m_{Al(OH)3} =1.32x10^{-3} molesHCl*\frac{1molAl(OH)3}{3molesHCl} *\frac{78gAl(OH)3}{1molAl(OH)3} =0.03g$

The percentage of Al(OH)₃ is:

$Percentage-Al(OH)3=\frac{m_{Al(OH)3} }{m_{antiacid} } *100=\frac{0.03}{0.196} =15.3$ %

3 0

3 years ago