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Daniel [21]
3 years ago
13

And active alkaline earth Metal with 56 protons

Chemistry
1 answer:
snow_tiger [21]3 years ago
4 0
Protons can't change in stable elements so its means that is Barium
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The radioactivity due to carbon-14 measured in a piece of a wood from an ancient site was found to produce 20 counts per minute
ss7ja [257]

Answer:

The answer is "17200 years".

Explanation:

Given:

A = 20 \ \frac{counts}{minute}\\\\A_{o} = 160\ \frac{counts}{minute}

Let the half-life of carbon-14, is beta emitter, is T = 5730\ years

Constant decay \ w = \frac{0.693}{ T}

= 1.209 \times 10^{-4} \ \frac{1}{year}\\

The artifact age t= ?

A = A_{o} e^{-wt} \\\\e^{-wt} = \frac{A}{A_{o}}\\\\-wt = \ln \frac{A}{A_{o}}\\\\= -2.079\\\\t = 1.7199 \times 10^{4} \ years\\\\\sim \ 17200\  years\\

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3 years ago
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Answer: taken from plants

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The troposphere is the area where most sheathed occurs.
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juin [17]

Answer:

Explanation:

This is the Difference Between a Hypothesis and a Theory. In scientific reasoning, a hypothesis is an assumption made before any research has been completed for the sake of testing. A theory on the other hand is a principle set to explain phenomena already supported by data.

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4 years ago
Starch and cellulose are both produced by plants, yet one is easily digested by animals and the other is not. Discuss the differ
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<span>Starch and cellulose have the same substance but different structures. They are both polysaccharides. The basic unit of a polysaccharide is the glucose. Glucose, which contains carbon, hydrogen, and oxygen, have two forms. The alpha-glucose with an alcohol group attached to carbon 1 is down and the beta-glucose with the alcohol group attached to carbon 1 is up. Starch is the alpha-glucose while cellulose is the beta-glucose. Starches are linked into a straight chain whereas the cellulose are connected like a pile of stack paper. When the human body eats starch, it can digest the starch but not the cellulose because it has no enzyme that can break it down. </span>
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