1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vikki [24]
3 years ago
8

For the Earth's atmosphere, section number two in the pie graph BEST represents the percentage of A) argon B) oxygen C) nitrogen

D) carbon dioxide.
Chemistry
1 answer:
larisa86 [58]3 years ago
3 0

-<u><em>Oxygen</em></u>

According to Google these are the percentages of the <em>Earths Atmosphere</em>

<em>1</em> 78% - Nitrogen

<u>2</u> 21% - Oxygen

<em>3</em> 0.9% - Argon

<em>4 </em>0.3 - Carbon Dioxide with very small percentage of other elements.

You might be interested in
"A crosslinked copolymer consists of 57 wt% ethylene (C2H4) repeat units and 43 wt% propylene (C3H6) repeat units. Determine the
ch4aika [34]

Explanation:

Percentage ethylene by weight = 57%

Percentage propylene by weight = 43%

Suppose in 100 grams of polymer:

Mass of ethylene = 57 g

Mass of propylene = 43 g

Moles of ethylene = \frac{57 g}{28 g/mol}=2.036 mol

Moles of propylene = \frac{43g}{42g/mol}=1.024 mol

1 mole = N_A =6.022\times 10^{23} molecules/ atoms

Units of ethylene = 2.036 mol\times N_A

Units of propylene = 1.024 mol\times N_A

a) Fraction of ethylene units:

=\frac{2.036 mol\times N_A}{2.306 mol\times N_A+1.024 mol\times N_A}=\frac{509}{765}

b ) Fraction of propylene units:

=\frac{1.024mol\times N_A}{2.306 mol\times N_A+1.024 mol\times N_A}=\frac{256}{765}

3 0
3 years ago
I2 is an example of a
Free_Kalibri [48]

Answer:

number

Explanation:

5 0
3 years ago
Read 2 more answers
The half of the moon facing the sun is always lit, but the different phases happen because:
zvonat [6]

Answer:

we only see parts of the lit side as the moon goes around the earth

Explanation:

Unlike the sun, the moon orbits the Earth. This is the reason why we see the <em>different phases of the moon.</em> The reflection of the moon is being illuminated back to us with the help of the sun. So, as the moon circles the Earth, we only see parts of the lit side. Such changes helps us see the moon in different phases such as<em> </em>the <em>Third Quarter, Crescent, New Moon, Full Moon, etc.</em>

For example, during "Full Moon," <em>the moon's entire face is lit up by the sun</em>. Thus, we see the entire moon's lit portion.

Thus, this explains the answer.

7 0
3 years ago
The yttrium- nuclide radioactively decays by electron capture. Write a balanced nuclear chemical equation that describes this pr
evablogger [386]

Answer:

See explanation and image attached

Explanation:

Yttrium has many isotopes, the lowest mass number of Yttrium  is 89Y.

Recall that electron capture converts an electron into a proton and then into a neutron with a consequent emission of a neutrino (v).

In electron capture, the mass number of the daughter nucleus remains the same as that of the parent nucleus while the atomic number of the daughter nucleus is less than that of the parent by one unit.

8 0
3 years ago
Which of the following is the best example of heat transfer by convection
Ugo [173]
B seems like the correct answer stay safe!
6 0
2 years ago
Other questions:
  • Decide which of the following statements are True and which are False about equilibrium systems:A large value of K means the equ
    15·1 answer
  • What is the periodic table and why is it neccessary?
    6·1 answer
  • What is it called when particles travel from an area of high consentration to an area of low consentration?
    14·1 answer
  • Evaporation is a process that requires energy to occur. Evaporation is ain)<br> reaction
    6·1 answer
  • For the following questions, use a periodic table and your atomic calculations to find the unknown information about each isotop
    7·1 answer
  • If a gas has a molecular mass of 44.0, the volume of 88.0 grams of the gas at STP would be ..
    14·1 answer
  • How many sig figs are in 0.00205kg
    5·2 answers
  • What is heterogenous mixture​
    15·2 answers
  • True or False-- Siblings (brothers and sisters) may or may not have the same combination of traits.
    13·2 answers
  • A reaction in which an acid reacts with an alkali to produce a salt and water only is known as
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!