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3 years ago

Can someone please help me !!- It would mean a lot ❤️

Chemistry

2 answers:

Reptile [31]3 years ago

6 0

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<h2 /><h2 /><h2>Kendall</h2>

If something is heretic, it refers to certain characteristics that is coded in our DNA. In science we know that this is possible through understanding the workings of the chromosomes & their functions.

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MrRissso [65]3 years ago

6 0

B. Carla is correct.

Why? - is the passing on of traits from parents to their offspring; either through asexual reproduction or sexual reproduction, the offspring cells or organisms acquire the genetic information of their parents. Heredity is the passage of genetic information from one generation to another. For offspring to inherit traitsthere must be a reliable mechanism for transferring genetic information from one generation to the next.

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Based on the periodic table, what do we now call the element mendeleev called eka-manganese?

myrzilka [38]

Based on the periodic table, the element mendeleev called eka-manganese is now called technetium. Technetium<span> is a silvery-gray metal that tarnishes slowly in moist air. Hope this answers the question. Have a nice day. Feel free to ask more questions.</span>

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3 years ago

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2 points

erica [24]

9 grams of hydrogen gas (H2) will SC Johnson need to react in order to make 1 bottle of Windex.

Explanation:

Balance equation for the formation of ammonia from H2 gas.

N2 + 3H2 ⇒ 2 $NH_{3}$

Given

mass of ammonia in 1 bottle of windex = 51 gram

atomic mass of ammonia 17.01 gram/mole

number of moles = $\frac{mass}{atomic mass of 1 mole}$

number of moles = $\frac{51}{17.01}$

= 3 moles of ammonia is formed.

in 1 bottle of windex there are 3 moles of ammonia 0r 51 grams of ammonia.

From the equation it can be found that:

3 moles of hydrogen reacted to form 2 moles of ammonia

so, x moles of hydrogen will react to form 3 moles of ammonia.

$\frac{2}{3}$ = $\frac{3}{x}$

x = 4.5 moles of hydrogen will be required.

to convert moles into gram formula used:

mass = atomic mass x number of moles (atomic mass of H2 is 2grams/mole)

= 2 x 4.5

= 9 grams of hydrogen.

7 0

2 years ago

Varvara68 [4.7K]

Answer:

Option C.

Ilegal dumping of waste

Explanation:

This is because non point source of pollution refers to source of pollution that are many and not directly one which is illegal or does not meet the legal term. This type of pollution does not have a point source, it has many sources and this type of pollution is cause by rainfall or precipitation. Where when the rain fall, it wash away the waste through to water bodies, causing pollution and endangering water bodies.

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3 years ago

CHEM HELP PLEASE (:<br><br> How many grams do <br> 1.3 x 10^21 atoms of sodium weigh?

Yuliya22 [10]

1.3 x 10^21 atoms Na is 4.63230769231 mol Na

4.63230769231 mol Na * 23g/mol Na = 106.543076923g

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3 years ago

Very urgent/easy chem question easy points

aev [14]

Sodium chloride is the answer

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3 years ago

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