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
denis23 [38]
3 years ago
15

Almost 99% of Earth's atmosphere is made up of two gases. What are the two gases and the percents of each?

Chemistry
1 answer:
mote1985 [20]3 years ago
3 0
D 21% carbon dioxide and 78% oxygen
You might be interested in
Some one help me please I'm stuck Show using two conversion factors how you would convert from 0.020 kg into mg.
julia-pushkina [17]

Answer:

=2.0x10^4mg

Explanation:

Hello there!

In this case, when performing units conversions involving two proportional factors we need to make sure we first convert to the base unit and then to the target one; thus, since 1 kg = 1000 g and 1 g = 1000 mg, we set up the following expression:

=0.020kg*\frac{1000g}{1kg} *\frac{1000mg}{1g} \\\\=2.0x10^4mg

Best regards!

4 0
3 years ago
Which of these claims about the way energy is transferred in Earth’s interior is supported by evidence ?
mr_godi [17]

Answer:

convection occurs in the inner core and crust

5 0
3 years ago
a 1. The electron configuration a particular metal contena de is [Ar]3d a) Identify the Corresponding metal b) write the electro
mario62 [17]

Explanation:

if it was meant for [Ar]4s²3d¹ :

1s²2s²2p⁶3s²3p⁶4s²3d¹

number of e‐ : 21

atomic number is 21.. element is scandium

ion: Sc³+

7 0
2 years ago
What is the atmospheric layer in which solar energy strips electrons from nitrogen and oxygen atoms, causing them to become posi
Vera_Pavlovna [14]

Answer:

thermosphere

Explanation:

  • The presence of the isolated molecules of gas in the thermosphere which includes the ionosphere is further broken into smaller ions particles by sun electrons that strip the oxygen and the nitrogen molecules and these ionized gases make up the ionosphere that about 80 o 400 km.
6 0
4 years ago
A beaker has 0.2 M of Na2SO4. What will be the concentration of sodium and sulfate ions?
enyata [817]

Answer:

Na+-0.0648M

SO4²-0.1352M

Explanation:

First find the R.A.M of the sodium sulphate

(23×2)+(32)+(16×4)=142

Find the portion of sodium ions=46/142×0.2

=0.0648M

Sulphate=

0.2-0.0648=0.1352M

8 0
3 years ago
Other questions:
  • Why is melting a physical property of the wax, but flammability is a chemical property?
    6·1 answer
  • What do the name and formula of a molecular compound describe?
    11·1 answer
  • A 5.0 g of copper was heated from 20°C to 80°C. How much energy was used to heat Cu? The specific heat of copper is 0.385 J/gC.
    6·1 answer
  • If I have 31 liters of helium in a balloon at 9°C and increase the temperature of the balloon to 28°C, what will the new volume
    8·1 answer
  • What volume of so2 is produced at 325 k and 1.35 atm when 15.0 grams of hcl reacts with excess k2so3?
    8·1 answer
  • Pleaseeeeeeeeeee helpppppppppppppppp
    8·1 answer
  • Which of the following of Dalton's theories do we no longer use today?
    9·1 answer
  • Ammonia will decompose into nitrogen and hydrogen at high temperature. Calculate the pressure equilibrium constant for the decom
    12·1 answer
  • Oxide. b) Silicon dio
    12·1 answer
  • Phương trình <br> BaCl2 + AgNO3
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!