HELP!!!! I need help with number 11 and 12

Answer:

Oxygen is an element.

Explanation:

Out of the choices listed, oxygen is the only element. The other choices are incorrect because air is a mixture of nitrogen, oxygen, carbon dioxide, water vapors, and some other gases; water is a compound of hydrogen and oxygen; and sodium chloride is a compound of sodium and chloride ions; meanwhile, oxygen is a pure element.

A flower vase placed on the table

Explanation:

A laborer pushing a crate on the table

A 16.0 L container at 333 K holds a mixture of two gases with a total pressure of 7 atm. If there are 2.72 mol of Gas A in the mixture, no. of moles of Gas B are 1.376.

The combined gas law is the law of of gaseous state which is made by combination of Boyle's law, Charle's law, Avogadro's law and Gay Lussac's law.

It is a mathematical expression that relates Pressure, Volume and Temperature.

(P1 × V1)÷T1 = (P2 × V2)÷T2

We can also use the following relation-

PV = nRT

Let n be the total no. of moles.

Given,

P = 7 atm

R = 0.0821

T = 333K

V = 16 L

n = PV / RT

n = 4.096

n = no. of moles of A gas + no. of moles of gas B

4.096 = 2.72 + x

x = 1.376

Therefore, A 16.0 L container at 333 K holds a mixture of two gases with a total pressure of 7 atm. If there are 2.72 mol of Gas A in the mixture, no. of moles of Gas B are 1.376.

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Answer:

(Hope this helps can I pls have brainlist (crown)☺️)

Explanation:

Because the atoms in metals form a matrix through which outside electrons may easily travel, metals are good conductors of electricity and heat. They generate a sea of electrons around the positive nuclei of the interacting metal ions, rather than circling their particular atoms.

The free flow of shared electrons can carry an electric current through a metal. Carbon atoms join with iron atoms to create bonds.

Answer:

A right? I'm pretty sure it's A

Answer:

hyrogen,Lithium,beryllium

Answer:

It is possible to separate several distinct compounds according to their varying volatilities by altering the temperature of the distillation process. A nonvolatile solute, on the other hand, will always remain in the solution if you have a nonvolatile solute in your solution.

Explanation:

Hope it helps:)

Answer:

The reason for this is that the composition of the vapor that is distilling varies continuously during the distillation

Answer:

Separation techniques

Separating Funnel - Separation techniques

Explanation:

if you look this up this should help i think

Answer:

the plan is:

Explanation:

Howler and warnibers is answer

Answer:

22 electrons

Explanation:

correct answer correct answer correct answer

Answer:

i honestly dont know how this is showing up on my thing i am 13

Explanation:

sorry i dont know at all

Answer: Lactate!

Explanation:Hope this helps!!!

Answer:

C, Truck B will have a greater stopping distance. Took the test got it right.

Explanation:

Answer:

the answer is c

Explanation: the truck with less kg means that it will be more likely to stop fast but if you have a high kg it will slide till it stops thus the answer is c

Answer:

419 grams of CO are needed.

Explanation:

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take a few cups of water in a pan and and heat it on a gas burner . the hot water , add some dark brown mixture . then add sugar and milk. sugar is a solute which dissolves in hot water to form a solution . after boiling put some more time , mixture is filtered through a tea - strainer . the prepared tea passes through the tiny holes of the tea - strainer and collects as of filtrate in the cup placed below. the used tea - leaves , being isoluble , collect as a Residue in the the tea - strainer .

〽hope it helps you ✅

Answer: remove a H2 molecule from the left side of the equation

Explanation:

In the chemical equation and concept of balancing of equations if to ensure that no diatomic hydrogen  is left over remove a H₂ molecule from the left side of the equation.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

pH=2 soda

Explanation:

There are more H+ ions in more acidic (lower on the pH scale) solutions. There are more H3O+ ions in more basic (higher on the pH scale) solutions.

Hope this helps!

Answer:

b. lemon juice pH=2

Explanation:

-i effect required here

Let's see which oxide shows more -i effect

P lies below Al

And -i effect increases down the group so acidity increases

Answer:

d

Explanation:

Generally, it is transported through pipes so I think statement d is incorrect.

Answer:

In chemistry, the law of conservation of mass states that the mass of the products (the chemical substances created by a chemical reaction) will always equal the mass of the reactants (the substances that make the chemical reaction). Think of it as being similar to balancing an algebraic equation.

Explanation:

(winks and runs off)

Answer:

Mass cannot be created or destroyed.

Explanation:

        Conservation of mass is "a principle stating that mass cannot be created or destroyed" (Oxford Languages).

Have a nice day! (there is not much rewording/etc you can do here as it is a simple principle, but I hope this will still help!)

    I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)

- Heather

Answer:

B. hydrochloric acid and lithium hydroxide

Explanation:

Answer:

thank you!

the answer is B) hydrochloric acid and lithium hydroxide.

Explanation:

have a rest of your day.

Answer:

square of it's speed

Explanation:

Answer:

kinetic energy increases as the square of its speed.

Answer:

wer

c=3.00×108 m/s (the speed of light in a vacuum) λ = wavelength in meters ν = frequency in Hertz (Hz) or 1s or s−1 .

Explanation:

I might be wrong also you don't have to give me brainliest save it for someone else who knows I might be wrong

Answer:

The more substituted alkene will be the major product.

Explanation:

Answer:

Carbon: 18, Hydrogen: 16, Oxygen: 8

Explanation:

Total # of atoms = 42

Organic

1 silver, 1 nitrogen and 3 oxygen

Subscripts show the number of atoms of each element in a compound

There is no subscript after Ag which shows there is only one silver atom. There is no subscript after N which shows there is only one nitrogen atom. However, there is a 3 in the subscript after O which shows there are 3 oxygen atoms

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\[/tex]

From the question

mass = 13 g

density = 19.3 g/cm³

We have

[tex]volume = \frac{13}{19.3} \\ = 0.673575...[/tex]

We have the final answer as

Hope this helps you

Baking soda is a salt of sodium and bicarbonate ions. In a soda test, the breath will raise the temperature as it contains water vapor and decomposes the soda.

The baking soda is also called sodium bicarbonate, and the test uses sodium bicarbonate as a reactant. It is also a leavening agent that is used in the preparation of food.

Breath contains some amount of water vapor that alters the test by diluting it and resulting in the clouding of the test. The water vapor decomposes the baking soda and alters the test results.

Therefore, breath contains water vapor.

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