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3 years ago

• identify early ideas about evolution

1 answer:

7 0

There is two ideas about evolution.

1.) Religious
2.) Scientific

In the religious one, people believe that we were created through god.

In the scientific one, people believe that we were created from apes and that throughout time we became humans.

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Which set of work should be used to solve the following problem?

VladimirAG [237]

Answer:

C. 65.5 g PF3 x (1 mole / 87.97 g PF3)

Explanation:

Dimensional analysis can be used to find the amount of moles in 65.5 grams of PF3 gas.

First we would need to determine relevant conversions.

We would need to find the molar mass of PF3 which is already given ( 87.97 g / mol )

So 1 mole of PF3 = 87.97g

From there we can create the dimensional analysis table which will look something like the attached image.

This table correspond with answer choice C.

Reasons it's not the other answer choices.

It wouldn't be A because the units must cancel out and they don't as grams is being multiplied by grams

It would be B because it doesn't use correct units.

There are not 87.97 moles in 1 gram of PF3. There are 87.97 grams in 1 mole of PF3

7 0

2 years ago

What is chemistry about

mr Goodwill [35]

Answer:

Explanation:

Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything.

6 0

3 years ago

Read 2 more answers

How would you make 100.0 mL of a 0.150 M NaCl solution?

Andrews [41]

There are a number of ways to express concentration of a solution. This includes molarity. It is expressed as the number of moles of solute per volume of the solution. For example, we are given a solution of 2M NaOH this describes a solution that has 2 moles of NaOH per 1 L volume of the solution.

0.150 M NaCl = 0.150 mol NaCl / L solution

mass of NaCl needed = 0.150 mol NaCl / L solution ( .100 L ) (58.44 g/mol) = 87.66 g NaCl needed

Hope this answers the question. Have a nice day.

8 0

3 years ago

Why when we chew a minty pice of gum your mouth and tounge is cold when you suck in air and when you drink moderaters help!!!!!!

il63 [147K]

Because gum is unhealthy

3 0

2 years ago

Plz help me!!!!plzzz!

yulyashka [42]

Answer:

Explanation:

Since the new moon is behind the earth, It is sun, earth, moon

4 0

3 years ago