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3 years ago

On a very hot day, could you cool your kitchen by leaving the refrigerator door open?

Chemistry

2 answers:

Scilla [17]3 years ago

8 0

Answer:c

Explanation:

timofeeve [1]3 years ago

7 0

Answer:

Hello There!!

Explanation:

The answer is C.No, the refrigerator would exhaust the same amount of heat into the room as it takes out of the room.

hope this helps,have a great day!!

~Pinky~

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What is the action force and the reaction force when you sit down on the chair

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The action force is you sitting on the chair and the reaction force is the gravity on the chair that is caused by you sitting on the chair

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3 years ago

A student environmental group is creating a campaign for locally sourced energy resources.

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Answer: The correct option is B. A farmer with a field of solar panels

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In a short paragraph, explain one thing you've learned from the course this year.

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Answer:

ive learned about the chart , ive learned about the coolest chemicle reactions and how. the can change colors , ive also learned that chenistrey is all around us since the beginning of life ,and how liquid can turn solid

Explanation:

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3 years ago

How many liters is in a gallon

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Bromine has two isotopes 79Br and 81Br, whose masses (78.9183 and 80.9163 amu) and abundances (50.69% and 49.31%, respectively)

Reika [66]

Answer:

Average atomic mass = 79.9034 amu

Explanation:

The formula for the calculation of the average atomic mass is:

$Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})$

Given that:

For first isotope:

% = 50.69 %

Mass = 78.9183 amu

For second isotope:

% = 49.31 %

Mass = 80.9163 amu

Thus,

$Average\ atomic\ mass=\frac{50.69}{100}\times {78.9183}+\frac{49.31}{100}\times {80.9163}\ amu$

$Average\ atomic\ mass=40.0036+39.8998\ amu$

Average atomic mass = 79.9034 amu

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3 years ago