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likoan [24]
3 years ago
7

1. What is one of the important roles of tropical rainforests in the earth's environment?

Chemistry
1 answer:
Makovka662 [10]3 years ago
3 0

Answer:

1.D

2.C

3.D

4.D

5.C

6 B

those are the answers, we must take care of our environment

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What are prevailing winds?
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Answer:

D) winds that blow in the same direction at a consistent speed

Explanation:

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What kinds of energy does the Sun provide earth
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 I am positive it is solar energy
 

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4. a compound called pyrene has the empirical formula c8h5. when 4.04 g of pyrene is dissolved in 10.00 g of benzene, the boilin
e-lub [12.9K]

The molecular mass of pyrene is 204.4 g/mol.

From;

ΔT = Kb m i

Where;

  • ΔT = boiling point elevation
  • Kb = boiling point constant
  • m = molality
  • i = Van't Hoff factor

Since the compound is molecular; i = 1

The number of moles of pyrene = 4.04 g/MM

Where; MM = molar mass of pyrene

molality = number of moles of pyrene/mass of solvent in Kg

The mass of solvent = 10 g or 0.01 Kg

molality =  4.04 g/MM/0.01

ΔT = Boiling point of solution - Boiling point of pure solvent

ΔT = 85.1°C - 80.1°C

ΔT = 5°C

5 = 2.53 × 4.04 g/MM/0.01 × 1

5 = 10.22 × 1/0.01 MM

0.05MM = 10.22

MM= 10.22/0.05

MM= 204.4 g/mol

Learn more: brainly.com/question/2292439

3 0
2 years ago
Which of the following would be expected to have the lowest first ionization energy?
scoundrel [369]

Explanation:

o2- Due to lowest Zeff.

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Which of the following properties increases down the periodic table?
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Answer: I think it’s atomic radius

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