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2 years ago

What does the period number tell about the energy levels occupied bye electrons in an atom

Chemistry

1 answer:

anyanavicka [17]2 years ago

3 0

Answer:

The period number tells which is the highest energy level occupied by the electrons.

Explanation:

The period number (denoted by n) is the outer energy level that is occupied by electrons in an atom.
The period number that an element is in, is the number of energy levels that the element has.
When we move across a period from left to right in a periodic table the number of electrons in atoms increases within the same orbit.

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A 7.47 g sample of calcium carbonate [CaCO3 (s)] absorbs 85 J of heat, upon which the temperature of the sample increases from 2

Alex_Xolod [135]

Answer:

Specific heat of calcium carbonate(C) = 0.82 (Approx)

Explanation:

Given:

Energy absorbs (q) = 85 J

Change in temperature (Δt) = 34.9 - 21 = 13.9°C

Mass of calcium carbonate = 7.47 g

Find:

Specific heat of calcium carbonate(C)

Computation:

Specific heat of calcium carbonate(C) = q / m(Δt)

Specific heat of calcium carbonate(C) = 85 / (7.47)(13.9)

Specific heat of calcium carbonate(C) = 85 / 103.833

Specific heat of calcium carbonate(C) = 0.8186

Specific heat of calcium carbonate(C) = 0.82 (Approx)

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2 years ago

Which compound has the the highest melting point?

Kobotan [32]

The answer is
Al2(co3)3

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2 years ago

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Hersey chocolate company makes 80 million kisses daily how many chocolate kisses are made per second

Scrat [10]

Answer:

92.5925925926

Explanation:

8 million divided by the seconds in a day witch is 86400

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2 years ago

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As the [H+] in a solution decreases, what happens to the [OH–]? A. It increases and the pH increases. B. It increases and the pH

AleksAgata [21]

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

D. It decreases and the pH increases.

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

pH is a measure of the hydorgen ion concentration of a solution. Solutions with a high concentration of hydrogen ions have a low pH and solutions with a low concentrations of H+ ions have a high pH.
<em><u>[H+] and [OH-] are inversely related. Therefore; As the concentration of H+ increases the pH decreases. Since the concentrations of H+ and OH- are inversely proportional, as one goes up, the other goes down. </u></em>
<em><u>Therefore, an increase in OH- concentration will correspond to an increase in pH and a decrease in the concentration of H+.</u></em>

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2 years ago

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What causes hot air to rise, and cool air to sink?

nataly862011 [7]

Answer:

hot air rises because gases expand as they heat up.When air heats up and expands,its density also increases.The warmer,less dense air effectively floats on top of the colder, dense air below it. This creates a buoyant force that causes warmer air to rise.

cold air sinks because it is heavier as its more dense ( because of closely packed molecules) soits harder for them to move and they absorb less energy. Also, gravity pulls on it more strongly.

Hope it helps :)

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2 years ago