Can someone please help me with this chemistry hw plzzzzz I really need help

Chemistry

2 answers:

Viktor [21]4 years ago

7 0

Hey I can't see the questions properly

castortr0y [4]4 years ago

4 0

Me too. I already made that clear

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C. Another radioisotope of americium exists which has an atomic mass of 242.

ollegr [7]

Answer:

1 g

Explanation:

The half-life of Am-242 (16 h) is the time it takes for half of it to disappear.

We can make a table of the mass left after each half-life.

$\begin{array}{cccc}\textbf{No. of} & & \textbf{Percent} & \textbf{Mass}\\\textbf{Half-lives} & \textbf{Time/h} & \textbf{Remaining} & \textbf{Remaining/g}\\0& 0 & 100 & 8\\1 & 16 &50 & 4\\2 & 32 & 25 & 2\\3 & 48 & 12.5 & 1\\4 & 64 & 6.25 & 0.5\\\end{array}$

The mass remaining after 48 h is 1 g.

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3 years ago

CARBOHYDRATES are found primarily in plant-based foods and are a major source of energy in the body (4 kcals per gram). If you c

SVETLANKA909090 [29]

Answer:

The 200 grams of carbohydrate would this convert to 800 kcals in a day.

Explanation:

Carbohydrates are the source of energy. The metabolism of 1 gram of carbohydrates gives 4 kcals of energy.

If 200 grams of carbohydrate is consumed in a day, then the energy provided by it is:-

$Energy\ provided\ by\ the\ carbohydrate = 200\times 4\ kcals=800\ kcals$

<u>The 200 grams of carbohydrate would this convert to 800 kcals in a day.</u>

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Why was Niels Bohr’s atomic model superior to all the earlier models?

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1) it explains about stability of an atom by including stationary state.
2) it explains tge quantization of energy.
3) it gives the concept of angular momentum of a revolving electron.

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<span>B. Osmosis is movement of proteins, and diffusion is movement of water.
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