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
kondaur [170]
2 years ago
11

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

Chemistry
2 answers:
Gwar [14]2 years ago
6 0

Answer:

21% oxygen and 78%nitrogen

Explanation:

Gnoma [55]2 years ago
6 0

Answer:

Nitrogen and Oxygen

Explanation:

nitrogen - 78 %

oxygen - 21%

You might be interested in
Help quickly will give brainliestt
galben [10]

Answer:

Diffusion is driven by differences in concentration. When chemical substances such as perfume are let loose in a room, their particles mix with the particles of air. Diffusion in gases is quick because the particles in a gas move quickly. It happens even faster in hot gases because the particles of gas move faster.

5 0
3 years ago
Choose all that apply. Which of the following are included in the physical sciences? biology sociology physics geology
Bond [772]
Physics and biology are the correct answers
3 0
3 years ago
Read 2 more answers
What is the density of water if you have 50.0 grams of water and a volume of 50.0 millimeters
Gnom [1K]

Answer:

\boxed {\tt 1.0 \ g/mL}

Explanation:

Density can be found by dividing the mass by the volume.

d=\frac{m}{v}

The mass of the water is 50.0 grams.

The volume of the water is 50.0 milliliters.

m= 50.0\ g \\v=50.0 \ mL

Substitute the values into the formula.

d=\frac{50.0 \ g}{50.0 \ mL}

Divide.

d= 1.0  \ g/mL

The density of the water is 1.0 grams per milliliter. Also, remember that the density of pure water is always 1.0 g/mL or g/cm³

8 0
3 years ago
A que llamamos niveles y subniveles de energia?
Softa [21]

Answer:

agua

Explanation:

por que estamos en la planeta

4 0
3 years ago
The total concentration of ions in a 0.75 M solution of HCl is
EastWind [94]
<h3>Answer:</h3>

The total concentration of ions in a 0.75 M solution of HCl is 1.5 M

That is; 0.75 M H⁺ and 0.75 M Cl⁻

<h3>Explanation:</h3>
  • Concentration or molarity is the number of moles of a compound or an ion contained in one liter of solution. It is measured in moles per liter (M).
  • The concentration of ions making a compound is determined by the ratio of moles of the compound and the constituents ions.
  • For instance, HCl dissociates to give H⁺ and Cl⁻

       HCl(aq) → H⁺(aq) + Cl⁻(aq)

  • Therefore, since the mole ratio between HCl and the constituent ions H⁺ and Cl⁻ is 1:1, then 0.75 M of HCl dissociates to give 0.75 M H⁺ and 0.75 m Cl⁻
  • Hence the total concentration of ions in a 0.75 M solution of HCl is 1.5 M (0.75 M H⁺ and 0.75 M Cl⁻)
4 0
3 years ago
Other questions:
  • Which value indicate the strongest base?<br> 1. pH of 8<br> 2. pH of 5<br> 3. pH of 12
    7·1 answer
  • Which property describes a material's ability to conduct heat?
    8·2 answers
  • Convert 7.801,000,000 to scientific notation. x10 what is the exponent for that​
    7·1 answer
  • 2. On a summer day, you take a road trip through Moses Lake, WA, in a sports car. You start out at a temperature of 21°C in the
    5·1 answer
  • Which of these is an organism?<br> a virus<br> b heart<br> c bacteria<br> d lung
    8·2 answers
  • Select the correct answer.
    10·1 answer
  • What happens when you mix baking powder baking soda and hydrogen peroxide together?
    13·1 answer
  • The ratio of zinc to copper in some alloy is 2 to 5. If 60 kilograms of zinc are used, how many kilograms of copper are needed t
    11·1 answer
  • If you add sucrose to catalase when testing for reactivity, do you expect to see a reaction?.
    7·1 answer
  • A hydrocarbon is a compound that contains mostly carbon and hydrogen. Calculate the percent composition (by mass) of the followi
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!