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2 years ago

What kind of a system is a coffee held in a cup??don't spam..

Chemistry

2 answers:

trasher [3.6K]2 years ago

7 0

<h2>Open system.</h2>

Explanation:

<h3>Hope it helps you!! </h3>

bagirrra123 [75]2 years ago

3 0

Answer:

open system

Coffee held in a cup is an open system because it can exchange matter water vapors and energy heat with the surroundings.

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Define solute and solvent

dexar [7]

Solute - the substance that dissolves into the solvent to produce a homogenous mixture

Solvent - the substance in which a solute dissolves to produce a homogeneous mixture

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2 years ago

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How do you convert ounces to grams

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However many ounces you have, just multiply that by 28.34952. The answer to that is the conversion. so 5 ounces is 141.7476. Proof below.

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1. In general, the nucleus of a small atom is stable. Therefore, over very short distances, such as those in a small nucleus,

postnew [5]

<h3>1. <u>Answer;</u></h3>

a. the strong nuclear force is much greater than the electric force.

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

<em><u>For an atom to be stable it means it has enough amount of binding energy to hold its nucleus together permanently. </u></em>
Therefore, <em><u>an unstable atom lacks enough amount of binding energy to hold its nucleus permanently and thus undergoes decay to achieve stability. Unstable atoms are therefore referred to being radioactive.</u></em>
Small atoms are stable; <u>this is because they have equal number of protons and neutrons and thus the protons and neutrons fill up energy levels while maximizing the strong force binding the nucleus together. </u>

<h3>9.<u> Answer;</u></h3>

b. change into a different element altogether.

Uranium-238 undergoes alpha decay. Therefore, uranium-238 will <em><u>change into a different element altogether</u></em>.

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

Unstable atoms undergo radioactive decay in order to achieve stability of their nucleus.
<em><u>Uranium-238 is an example of such atom, which may undergo decay to achieve stability.</u></em>
<em><u>Alpha decay is one of the types of decays,</u></em> others being beta decay and gamma decay. <em><u>In alpha decay the radioactive isotope undergoes decay such that its mass number is decreased by four and its atomic number is decreased by two.</u></em>
Therefore, <em><u>Uranium-238 undergoes alpha decay to form a different element whose mass number is 234 and atomic number is 90, known as thorium-234. </u></em>

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3 years ago

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fish give off the compound ammonia which has a pH above 7 to which class of compounds does ammonia belong

jasenka [17]

<span><u><em>Answer:</em></u>
The compound ammonia given by fish is alkaline

<u><em>Explanation:</em></u>
<u>We can classify elements/compounds based on their pH values into three types:</u>
<u>acids:</u> these are compounds having pH value lower than 7
<u>neutral:</u> these are compounds having pH value equal to 7
<u>alkalies:</u> these are compounds having pH values higher than 7

This is shown in the attached image

We are given that the pH of the compound ammonia generated by the fish is above 7.
According to the above explanation, compound ammonia would be an alkaline compound.

Hope this helps :)</span>

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3 years ago

Scientists frequently use all of the following to support the theory that organisms change over time except.

Pie

Answer:

Explanation:

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What kind of a system is a coffee held in a cup??​don't spam..

What kind of a system is a coffee held in a cup??don't spam..