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allochka39001 [22]
3 years ago
5

The Case of the Missing Mass: Students have completed the experiment of combining vinegar and baking soda. They notice that thei

r beginning mass in the video does not match the ending one. Use the equation(below) and the Law of Conservation of Mass to explain why the students have NOT destroyed atoms in their experiment. This is the chemical equation for the experiment:
Chemistry
1 answer:
RSB [31]3 years ago
5 0
They notice that their beginning mass in the video does not match ... Use the equation(below) and the Law of Conservation of ... This is the chemical equation for the experiment:.
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Group 17 is called the halogen family, and the group to its right is called the noble gases. How are the elements in these group
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Answer: they all have 7  electrons they have different atom sizes

Explanation: hope it helps

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What element is used in bright flashing advertising signs
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The element used in advertising signs is neon.
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How many standard amino acids are there in the human body?
Whitepunk [10]

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2 years ago
Strontium-90 is one of the products of the fission of uranium-235. This strontium isotope is radioactive, with a half-life of 28
Firlakuza [10]

Answer:

67.6 years is the time the isotope take to decay from 0.900g to 0.170g

Explanation:

The radioactive decay follows first order law:

Ln [A] = -kt + ln[A]₀

<em>Where [A] is concentration after time t,</em>

<em>k is decay constant:</em>

<em>k = ln 2 / t(1/2)</em>

<em>k = ln2 / 28.1 years</em>

<em>k = 0.02467 years⁻¹</em>

<em>[A]₀ = Initial concentration.</em>

<em />

We can replace concentration and use the mass of the isotope:

Ln [A] = -kt + ln[A]₀

Ln [0.170g] = -0.02467 years⁻¹t + ln[0.900g]

-1.667 = -0.02467 years⁻¹t

t =

<h3>67.6 years is the time the isotope take to decay from 0.900g to 0.170g</h3>
5 0
3 years ago
Where does energy travel to? *<br> 1 point<br> HOT to COLD<br> COLD to HOT
Slav-nsk [51]

Answer:

Hot to cold

Explanation:

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3 years ago
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