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Archy [21]
4 years ago
10

How did life begin? need asap

Chemistry
2 answers:
3241004551 [841]4 years ago
5 0

From KimbeKimbe21 in a comment section found on the page:

"The earth began to be formed over 4.5 billion years ago,but for millions of years nothing could live here.Gradually,the earth's crust and the atmosphere formed.The simplest fo…rm of life, bacteria and algae,probably began to grow less than four billion years ago.Human beings did not appear until about two million years ago."

stealth61 [152]4 years ago
4 0
Birds and bees. Adam and Eve
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How many atoms are in TWO water (H20) molecules?
WINSTONCH [101]

Answer:

6

Explanation:

There are two atoms of hydrogen and one atom of oxygen in each water molecule, making the formula H 2 O.  So in two there would be 4 hydrogen and 2 oxygen

6 0
3 years ago
Read 2 more answers
A liquid is cooled during an investigation causing it solidify.Which of the following most likely occurred? A.Absorption of heat
mojhsa [17]

Answer:

C. A physical change.

Explanation:

A liquid is cooled during an investigation causing it solidify.Which of the following most likely occurred?

A. Absorption of heat. NO. Heat was released.

B. A chemical change. NO. It was a physical change

C. A physical change. YES. The physical change is called solidification.

D. Formation of a new compound. NO. This would be a chemical change.

6 0
3 years ago
Methanol is the simplest alcohol. How are larger alcohol molecules formed?
bazaltina [42]

Answer:

Methanol, also known as methyl alcohol amongst other names, is a chemical with the formula CH₃OH. It is a light, volatile, colourless, flammable liquid with a distinctive alcoholic odour similar to that of ethanol.

Explanation:

7 0
3 years ago
Read 2 more answers
Consider this reaction mechanism:
tester [92]

Answer:

c)Mo(CO)6 + P(CH3)3  Mo(CO)5P(CH3)3 + CO

-cause i took the test on engenuity

8 0
3 years ago
How many grams of NH3 will have the same number of molecules as 26.2 g of C6H?
Effectus [21]

Answer: 2 grams

Explanation:

chemical formula of C6H:

C6H

relative atomic mass of

C:12

H:1

C6:72

H1:12

relative formula mass of

C6H1=73

molar mass of glucose:

73g

the molar mass is the mass of one mole of a substance.

in

26.2g

of C6H there are

26.2 divide by 73g moles present.

there are 0.358 or 35.8*10-1

I gram of NH3 is 17.03052

2 grams of NH3 is 35

3 0
4 years ago
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