What is the air we breathe composed of?

Answers

Answer 1

Answer:

oxygen

Explanation:


Related Questions

Which of the following is not a chemical change?
a. paper being shredded
b. steel rusting
c. charcoal burning
d. a newspaper yellowing in the sun

Answers

Answer:

paper being shredded

Explanation:

Answer:

its A

Explanation:

8. The size and shape of an object are some of its....

Answers

Answer:

Characteristics...

Explanation:

I hope that's right, if not super sorry. I'm not the smartest. I tried my best if it's wrong

Which force is equal but opposite to the one shown?

Answers

Answer:B

Explanation:

CuBr(s)⇄Cu+(aq)+Br−(aq)

Shown above is the chemical equation for the dissolution of the slightly soluble salt CuBr(s). Its Ksp value in pure water was experimentally determined. CuBr was found to be much less soluble in a 0.001MNaBr solution than in pure water. Which of the following correctly explains the decrease in solubility of CuBr in 0.001 M NaBr?

A.)The concentration of water is much less in the NaBr solution than in pure water, reducing the rate of dissolution of the salt.
B.)The presence of Na+ ions in the solution inhibits the dissolution of salts.
C.)The presence of additional Br− already in the solution decreases the value of the Ksp for CuBr , causing the solubility to decrease.
D.)The presence of additional Br− ions already in the solution means equilibrium will be reached when much less CuBr has dissolved.

Answers

Answer:

D) The presence of additional Br- ions already in the solution means equilibrium will be reached when much less CuBr has dissolved.

Explanation:

CuBr ⇄ [tex]Cu^+[/tex] + [tex]Br^-[/tex]

Because there is Br- in CuBr, when put into solution, those Br- ions become part of the products side of the equation, shifting the equilibrium back towards the CuBr side, meaning less CuBr will dissolve.

The decrease in the solubility of the CuBr in NaBr solution has been due to the presence of additional Br ions in the solution. Thus option C is correct.

The equilibrium position has been the condition when the concentration of the reactants and products has been equal. The solubility of the CuBr has been dependent on the ksp for the solution.

The ksp has been the solubility product and has been dependent on the concentration of the reactants. The NaBr solution will be dissociated in the form of Na ions and Br ions. The dissolution has been based on the equilibrium of the CuBr.

With the presence of additional Br ions, the equilibrium of the CuBr solution has been reached earlier, and thereby the solubility of the solution has been decreased.

The decrease in the solubility of the CuBr in NaBr solution has been due to the presence of additional Br ions in the solution. Thus option C is correct.

For more information about solubility, refer to the link;

https://brainly.com/question/4736767

chemical equation for cycloheptane (l)

Answers

Answer: C7H14 - PubChem.

Explanation:

How much energy is required to heat up a Styrofoam cup from 25oC to 40oC? The mass of the cup is 20 grams and the specific heat capacity of Styrofoam is 1.1 J/(g *oC). Group of answer choices

Answers

Answer:

[tex]Q=330J[/tex]

Explanation:

Hello!

In this case, since the energy involved during a heating process is calculated as shown below:

[tex]Q=mC(T_2-T_1)[/tex]

Whereas we consider the mass, heat capacity and temperature; we are able to plug in the given data to obtain:

[tex]Q = 20g*1.1\frac{J}{g\°C}(40\°C-25\°C)\\\\Q = 330J[/tex]

Best regards!

when a liquid is cooled the kinetic energy of the particles a)decrease b) increase c) stay the same​

Answers

Answer:

a) decrease

Explanation:

Hope this will help

Close friendships at work are often bad for the business. true or false and why?

Answers

Explanation:

true true true true true true

Answer:

False

Explanation:

Because that is your friend and your friend is helping you in other things that you need some help.

A simple circuit with a battery connected to a buzzer by electrical wires is placed on a table. When the buzzer sounds, the table begins to ratte. Which form of energy makes the table rattle?
chemical
ОО
electrical
heat
mechanical

Answers

Answer:

Mechanical

Explanation:

mechanical energy:

energy that an object has

because of its motion or

position

Section
1
2
7)
Given the equation representing a reaction:
203Pb + 5921 TECn + on
3
4
5
Which type of reaction is represented by this equation?
6
A)
neutralization
8
-9
B)
polymerization
C)
substitution
10
11
12
13
= 14
- 15
16
-17
D)
transmutation
18
19
20
21

Answers

Answer:

a

Explanation:

neutalize acidity level

Hey
here to help and to serve

Answers

Answer:

lol thx

Explanation:

53.0 g of silver (1) nitrate reacts according to the reaction shown below:
AgNO3 + KCI — AGCI + KNO3
Find the theoretical yield of AgCl. If the amount of AgCl actually produced is 38.5 grams,
what is the percent yield of the experiment?

Answers

Answer:

Percent yield = 86.09%

Theoretical yield of AgCl = 44.72 g

Explanation:

Given data:

Mass of silver(1) nitrate = 53.0 g

Actual yield of AgCl = 38.5 g

Theoretical yield of AgCl = ?

Percent yield = ?

Solution:

Chemical equation:

AgNO₃ + KCl    →   AgCl + KNO₃

Number of moles of AgNO₃:

Number of moles = mass/molar mass

Number of moles = 53.0 g/ 169.87 g/mol

Number of moles = 0.312 mol

now we will compare the moles of AgNO₃ and AgCl

               AgNO₃         :           AgCl

                   1               :                1

                0.312          :           0.312

Theoretical yield of AgCl:

Mass = number of moles × molar mass

Mass = 0.312 mol × 143.32 g/mol

Mass = 44.72 g

Percent yield:

Percent yield = (actual yield / theoretical yield) × 100

Percent yield = ( 38.5 g / 44.72 g ) × 100

Percent yield = 86.09%

How often is Earth's surface being changed?

1 every hundred years
2 never
3 at all times
4 once a year

Answers

Answer:

I believe it is 3.

Explanation:

because the earth is constantly shifting.

It is changing all the time.

The Earth's surface is constantly changing.
3

how many grams are in 5.12 moles of Al

Answers

Answer:

138.14547456

Explanation:

How many moles Aluminium in 1 grams? The answer is 0.037062379468509.

We assume you are converting between moles Aluminium and gram.

You can view more details on each measurement unit:

molecular weight of Aluminium or grams

The molecular formula for Aluminium is Al.

The SI base unit for amount of substance is the mole.

1 mole is equal to 1 moles Aluminium, or 26.981538 grams.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between moles Aluminium and gram.

Answer:

[tex]\boxed {\boxed {\sf About \ 138 \ grams \ of \ aluminum}}[/tex]

Explanation:

To convert from moles to grams, we must use molar mass.

This can be found on the Periodic Table, so look for the symbol for aluminum: Al

Al: 26.981538 g/mol

We can use this number as a ratio.

[tex]\frac { 26.981538 \ g \ Al} { 1 \ mol \ Al}[/tex]

Multiply by the given number of moles: 5.12

[tex]5.12 \ mol \ Al *\frac { 26.981538 \ g \ Al} { 1 \ mol \ Al}[/tex]

Multiply. The moles of aluminum will cancel.

[tex]5.12*\frac { 26.981538 \ g \ Al} { 1}[/tex]

[tex]138.145475 \ g \ Al[/tex]

Round. The original measurement of moles has 3 significant figures, so our answer must also have 3 sig figs.

For the number we calculated, that is the ones place. The 1 in the tenth place tells us to leave the 8.

[tex]138 \ g \ Al[/tex]

There is about 138 grams of aluminum in 5.12 moles.

Jesim wants to help Nancy understand the movement that happens during one Earth year, Jassim holds a small globe representing Earth, and Nancy holds a large ball representing the Sun. What should Jessim do to show
Nancy what happens during one Earth year?
Jessim should not move except to slowly spin the globe
Jesim should slowly spin the globe and walk away from Nancy
Jessim should have Nancy walk around him while spinning the ball
Jessim should spin the globe quickly while walking in a circle around Nancy

Answers

the answer is D jessim should spin the glove quickly while walking in a circle around nancy.

Answer:

The answer is D jessim should spin the glove quickly while walking in a circle around nancy.

Explanation:

A pure sample of gold has a volume of 25.0 cm3 and a mass of 483 g. What is the density of gold?

Answers

Answer:

19.4 g/cm^3

Explanation:

how many oxygen atoms are in 1 mol of CO2

Answers

Answer:  2 atoms

Explanation: A molecular formula of the compound carbon dioxide is CO 2 . One molecule of carbon dioxide consists of 1 atom of carbon and 2 atoms of oxygen.

__C + __H2O → __CO + H2

Answers

Answer:

It is balanced

Explanation:

There is 1 Carbon, 2 Hydrogen, and 1 Oxygen on the right and 1 Carbon, 1 Oxygen and 2 Hydrogen on the left. This equation is balanced.

100 POINTS AND BRAINLIEST FOR HELP
Write a paragraph that explains diffusion and osmosis and how it relates to the circulatory system. Each sentence should be typed in the appropriate color.

It should include an introductory sentence that restates the question. A sentence that explains diffusion. A sentence that explains osmosis and at least 2-3 sentences that explain the relationship between diffusion, osmosis and the circulatory system. And, lastly, a conclusion sentence.

Answers

Materials are transferred between individual cells and their internal environment through the cell membrane by diffusion, osmosis, and active transport. During diffusion and osmosis, molecules move from a higher concentration to a lower concentration. Osmosis: Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution. Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. This would be the diffusion.

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