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

Answers

Answer 1

Answer:

21% oxygen and 78%nitrogen

Explanation:

Answer 2

Answer:

Nitrogen and Oxygen

Explanation:

nitrogen - 78 %

oxygen - 21%


Related Questions

PLEASE DON'T PUT ANSWER AGAINST GUIDELINES!!!

Answers

Answer:

160.3 g S

Explanation: there you go

how to tell if something is a strong or weak acid or base

Answers

Answer:

It basically depends upon the pH value of that acid or Base. That's how you can determine whether the substance is a strong or weak acid/base. We have a pH scale ranging from 1 to 14, where 7 is the neutral point. Any substance having a pH of 7 means it is neither an acid nor a Base, but neutral in nature, such as water([tex]H_{2}O[/tex]). Now, if the pH is less than 7, the substance is an acid, similarly if the pH is more than 7, it is a base. As the pH DECREASES, the substance becomes more acidic, on the other hand as the pH INCREASES, the substance becomes more basic. This way you can compare between pH values of two substances and tell which one is stronger or weaker.

For Acids:

If a substance's pH is between 1 and 7 it is an acid. If it is more towards 1, it's a strong acid and if it's more towards 7 it is a weak acid.

For Bases:

If a substance's pH is between 7 and 14 it is a base. If it is more towards 14, it's a strong base and if it's more towards 7 it is a weak base.

Hope that helps...

Alkaline batteries adopted their name from the _____ that is present in the reactions at both the zinc anode and the MnO2 cathode.

Answers

Answer:

hydroxide ion

Explanation:

The alkaline battery got this name because it has an alkaline electrolyte of potassium hydroxide.

Different isotopes of an element have different numbers of:

Answers

Explanation:

Different isotopes of an element have different numbers of mass number

how many atoms of mercury are in 50.15 g of mercury?

Answers

Answer:

please mark brainliest

Explanation:

The correct answer to this question is 0.2500 mol

Formula to calculate moles:

Moles = mass ÷ molar mass (n=m/M)

Mass = 50.15g

Atomic mass: 200.59 amu

Moles = 50.15g/200.59

= 0.2500 mol.

what is the speed of a skater who travels a distance of 210 m in a time of 10 seconds

Answers

Answer:

Speed =d/t. 200÷10=21÷1000=0.021 km/h

Explanation:

S=D/T

A student makes an aqueous solution of sodium hydroxide. Which statement correctly identifies the two ions present in the solute of this mixture?
The sodium ion is positive, and the hydroxide ion is negative.
The sodium ion is neutral, and the hydroxide ion is neutral
ОООО
The sodium ion is positive, and the hydroxide ion is

Answers

Answer:

PLEASE DO IT PROPERLY I WELL ANSWER IT BUT I CAN'T "I CANNOT UNDERSTAND" I'M VERY SORRY

Explanation:

Question:A student makes an aqueous solution of sodium hydroxide. Which statement correctly identifies the two ions present in the solute of this mixture?

A student makes an aqueous solution of sodium hydroxide. Which statement correctly identifies the two ions present in the solute of this mixture?The sodium ion is positive, and the hydroxide ion is negative.

A student makes an aqueous solution of sodium hydroxide. Which statement correctly identifies the two ions present in the solute of this mixture?The sodium ion is positive, and the hydroxide ion is negative.The sodium ion is neutral, and the hydroxide ion is neutral

A student makes an aqueous solution of sodium hydroxide. Which statement correctly identifies the two ions present in the solute of this mixture?The sodium ion is positive, and the hydroxide ion is negative.The sodium ion is neutral, and the hydroxide ion is neutralОООО

A student makes an aqueous solution of sodium hydroxide. Which statement correctly identifies the two ions present in the solute of this mixture?The sodium ion is positive, and the hydroxide ion is negative.The sodium ion is neutral, and the hydroxide ion is neutralООООThe sodium ion is positive, and the hydroxide ion is

Answer:The litmus paper test is a simple test in order to determine whether a given solution is acidic or basic. One will have to place a drop of a solution on the litmus paper. If it changes a red litmus paper to blue, the solution is basic. If it changes a blue litmus paper to red, the solution is acidic.

the are 2 answers

2nd² answer:It's because of 7-hydroxyphenoxazone. When exposed to acids below pH 4.5, the molecule looks like the image below and this gives litmus paper its red color. As the pH of the test solution moves towards alkaline, one of the hydrogen atoms (white hemispheres) starts to break off (disassociate).

CARRY ON LEARNING

THANKS FOR THE POINTS I HOPE YOU'LL UNDERSTAND ME.

P I E C K N P I E C K __________________

for the reaction, Pb(no3)2 + 2kI yields pbi 2 + 2 kno3, how many moles of lead iodine are produced from 300 g of potassium iodine

Answers

Good its true no problem plus 222-333

Read this sentence from Chapter One of Jack London’s The Call of the Wild.

Buck rushed at the splintering wood, sinking his teeth into it, surging and wrestling with it. Wherever the hatchet fell on the outside, he was there on the inside, snarling and growling, as furiously anxious to get out as the man in the red sweater was calmly intent on getting him out.

What is a good prediction question to ask after reading this excerpt?

Answers

Answer:

b)

Explanation:

It shows the natrual proggresion of a story and helps blend the narrtive together.

Answer:B

Explanation: i took the quiz on edge

What is the mass number (A) of an atom that has an atomic number (Z=26) with 29 neutrons and 26 electrons?​

Answers

Answer:

A = 55

Explanation:

The atomic number is the number of protons also = the number of electrons, so basically we have 29 neutrons, 26 electrons and 26 protons. Anyway, it's asking the mass number which is the neutrons + the protons, so you just take 29+26 = 55

Atomic number=26

Neutrons=29

Electrons=26

Mass number=Proton+neutron

Protons=26

Mass number=26+29

=55

noble gases are used in many situations where a safe and constant environment must be maintained. for example, helium is used to provide a protective atmosphere for making fiber optics and semiconductors. argon is used to fill incandescent and flourescent light bulbs to prevent oxygen from corroding the hot filament. why are noble gases used in these situations?

Answers

Answer:

Noble gases have a complete valence electron shell making them stable and nonreactive.

Explanation:

20 points be right this is my final!!!

Answers

I think it’s c hope it helps.

which particle diagram shown above best represents the strongest intermolecular force between two ethanol, c2h6o, molecules?

Answers

The strongest intermolecular bonding in ethanol is hydrogen bonding.

Intermolecular forces are the forces that hold two molecules of a substance together in a given state of matter. For ethanol, the strongest intermolecular force is hydrogen bonding.

Hydrogen bonding occurs when hydrogen is directly linked to a highly electronegative element such as oxygen, nitrogen, fluorine or sulfur. The existence of intermolecular hydrogen bonds accounts for unusual properties such as abnormally high melting and boiling points.

Learn more about intermolecular forces: https://brainly.com/question/17111432

Multiply or divide to find the equivalent fraction.

51/120=□/360

Answers

Answer

153

Explanation:

51/120 = x/360

51(360) = 120x

18360 = 120x

18360/120x = 120x/120x

153 = x

Answer:

153

Explanation:

Is mercury an electrolyte at room temperature?​

Answers

Answer:

No

Explanation:

Despite mercury being a metal, it is a liquid at room temperature. It cannot be an electrolyte. This is because most of the liquids that can conduct electricity or acids bases and salts whereas mercury is a metal.

no, mercury is a liquid at room temperature it is a metal. it cannot be an electrolyte

name a metal and non metal which are liquid at normal pressure and temperature

Answers

Answer:

metal : Mercury(Hg)

non metal : bromine (Br)

Explanation:

mercury is liquid at room temperature and pressure and the same as bromine

Elements that become cations during bonding become smaller as a result.
A.
True

B.
False

Answers

It’s False sorry if it’s wrong but I hope it help

How many moles is 2.50 grams of oxygen?

Answers

Answer:

Mole is a number that connects mass of a substance with its number of particles. 2500 g of O2 = 1/32 x 2500 = 78.125 moles

Explanation:

have a great day

How does thermal energy flow?

Answers

Answer:

Thermal energy typically flows from a warmer material to a cooler material.

Explanation:

people tint their car windows to stop what

Answers

Answer:

Reflection

Explanation:

Answer:

b

Explanation:

the atomic number is the same as the number of which subatomic particle?

Answers

Protons, hope this helps

Look at the graph. Which part of the line shows a time
when the object was not moving?

Answers

B.

For the period of B, the line didn’t go up or down, it stayed still.
this shows that time was still passing but the car didn’t move.

how many grams are in 4.07x10^15 molecules of calcium hydroxide

Answers

There are 5.01 × 10-⁷grams in 4.07 x 10¹⁵molecules of calcium hydroxide.

HOW TO CALCULATE MASS:

The mass of a substance can be calculated by multiplying the number of moles in the substance by its molecular mass.

However, given that the number of molecules in calcium hydroxide is 4.07 x 10¹⁵molecules, we need to calculate the number of moles in Ca(OH)2 as follows:

no. of moles of Ca(OH)2 = 4.07 x 10¹⁵ ÷ 6.02 × 10²³

no. of moles = 0.676 × 10-⁸

no. of moles = 6.76 × 10-⁹ moles.

Molar mass of Ca(OH)2 = 74.093 g/mol

Mass of Ca(OH)2 = 74.093 × 6.76 × 10-⁹ moles

Mass = 5.01 × 10-⁷grams.

Therefore, there are 5.01 × 10-⁷grams in 4.07 x 10¹⁵molecules of calcium hydroxide.

Learn more about how to calculate mass at: https://brainly.com/question/8101390?referrer=searchResults

A molecular compound is found to consist of30.4% nitrogen and 69.6% oxygen. Ifthe molecule contains 2 atoms of nitrogen, what is the molar mass of the molecule

Answers

Answer:

92.01 g/mol

Explanation:

So first you need to find the empirical formula by the percents. That would be, assuming that you have 100 grams of the the sample, divide each quantity of each element found by its respective molar mass.

30.4 g of N ÷ 14 g/mol N= 2.17 mol of N

69.6 g of O ÷ 16g/mol= 4.35 mol of O

You can establish now the empirical formula.

N2.17O4.35,

but since you can't have a decimal subscript, you divide each subscript by the minimum subscript

NO2

So then you're said that the molecular formula derived from that empirical formula has 2 nitrogen, so you multiply all the subscripts, by 2:

N2O4

-Dinitrogen Tetraoxide

-Nitrogen oxide (IV)

Then all you have to do is find the molecular mass of the compound using the periodic table and what you obtain is the molar mass.

remember: molecular mass is correspondent to molar mass.

9
Ammonia is manufactured from nitrogen and hydrogen by the Haber process.
N2(g) + 3H2(g)2NH3(g)
What is the percentage yield when 60 kg of ammonia is produced from 60 kg of hydrogen?
A
5.9%
B
17.6%
с
35.3%
D
50.0%

Answers

Answer:

B

17.6%

Explanation:

1. Percentage yield = (Actual yield/theoretical yield) x 100

2. You know actual yield of ammonia (60kg) so you need to work out theoretical yield.

3. mols of hydrogen = m/mr = 60,000/2 = 30,000 mols.

4. 3:2 ratio so (30,000/3) x 2 = 20,000 mols of Ammonia.

5. Therefore mass of ammonia = mr x mols = 20,000 x 17 = 340,000 grams

6. So percentage yield is (60,000/340,000) x 100 = 17.6

This is my class group-work with my friends but we are stuck on this question.

Answers

Explanation:

It has to be C, because Carbon can bond with four other atoms and is like a four-hole wheel.

(Sorry if my elplanation was kinds choppy Oof, helpfully it makes sense?)

Write a balanced equation and name the products of the reaction CaCl2+Na3(PO4)

Answers

Answer:

3CaCl2 + 2Na3(PO4) → Ca3(PO4)2 + 6NaCl

Explanation:

DOUBLE REPLACEMENT REACTION

CaCl2 + Na3(PO4) → Ca3(PO4)2 + NaCl

3CaCl2 + 2Na3(PO4) → Ca3(PO4)2 + 6NaCl

calcium chloride + sodium phosphate → calcium phosphate + sodium chloride

Hope that helps

Which of the following compounds will have the highest boiling point?


MgCl2



CO2


C12H22O12

,

H2O

Answers

MgC12 has the highest boiling point

explain why almunium is often used for long distance over head electric cables (high voltage)​

Answers

Answer:

because it does not cost much and can be found easily.  due to their low resistance and excellent conductivity.

Explanation:

If a sample of gas at constant temperature has its pressure doubled, what will happen to its volume?

Answers

Answer:

it'll halve

Explanation:

the gas is compressed with twice the pressure. The volume will be halved.

im certain

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