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Sindrei [870]
2 years ago
11

HELP PLEASE (If you cant answer all, that okay! First to answer all will be mark BRAINLIEST!)

Chemistry
1 answer:
Yakvenalex [24]2 years ago
4 0

Answer:

<em>Hope this helps :)</em>

Explanation:

Antoine Lavoisier- used patterns to predict undiscovered elements

John Newlands- Arranged elements according to their atomic

Johann Wolfgang- created groups of three elements, each based on Johann Wolfgang Dobereiner

Dmitri Mendeleev- divided elements into four categories

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Answer:

x = 33.52 amu

Explanation:

It is given that,

Isotope A has a mass of 34 amu and an abundance of 52%, isotope B has a mass of 33 amu and an abundance of 48%.

Let x is the average atomic mass of this element. It can be calculated as follows :

x=52\%\ \text{of}\ 34+48\%\ \text{of}\ 33\\\\x=\dfrac{52}{100}\times 34+\dfrac{48}{100}\times 33\\\\x=0.52\times 34+0.48\times 33\\\\x=33.52\ \text{amu}

So, the average atomic mass of this element is 33.52 amu.

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3 years ago
Mrs. Lewis gives you a piece of iron and asks you to determine the physical and chemical properties of the metal. She wants you
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Which statement describes the light reaction of photosynthesis?
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Answer:

A

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What do you think is meant by the statement "the digestive system is very different
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Seaweed attached to rocks in the ocean performs photosynthesis underwater. Which statement best explains how some seaweed can su
tia_tia [17]

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Seaweeds are able to perform photosynthesis underwater because they are efficient users of sunlight energy. Hence, they require only a small amount of sunlight that penetrates the ocean to perform photosynthesis.

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