they are located between each of the atrium and ventricle to prevent blood from flowing backwards, what is it?​

Answer: c

Explanation: I took it

Answer:

IT WILL HOVER IN THE MIDDLE

Explanation:

In the above intermediate chemical equation, oxygen will appear as follows: O₂(g) as a reactant (option B).

A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

According to this question, an intermediate chemical equation is presented as follows:

As observed in the above chemical equation, oxygen will react in its gaseous form i.e. as a reactant.

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To determine the correct answer, we need to calculate the theoretical yield of aluminum chloride (AlCl3) based on the given reaction and the amount of aluminum (Al) provided.

The balanced chemical equation for the reaction is:

2 Al(s) + 3 Cl2(g) → 2 AlCl3(s)

From the equation, we can see that 2 moles of Al react with 3 moles of Cl2 to produce 2 moles of AlCl3.

First, let's convert the mass of aluminum (Al) to moles:

Molar mass of Al = 26.98 g/mol

Mass of Al = 13.5 g

Moles of Al = Mass of Al / Molar mass of Al

           = 13.5 g / 26.98 g/mol

          ≈ 0.5004 mol (approximately)

Now, using the stoichiometry of the balanced equation, we can calculate the moles of chlorine gas (Cl2) required:

From the balanced equation, we know that:

2 moles of Al react with 3 moles of Cl2

Moles of Cl2 = (3/2) * Moles of Al

           = (3/2) * 0.5004 mol

           = 0.7506 mol (approximately)

To convert moles of Cl2 to grams, we use the molar mass of chlorine (Cl2):

Molar mass of Cl2 = 35.45 g/mol (approximately)

Mass of Cl2 = Moles of Cl2 * Molar mass of Cl2

           = 0.7506 mol * 35.45 g/mol

           ≈ 26.62 g (approximately)

Now, let's calculate the theoretical yield of aluminum chloride (AlCl3) using the stoichiometry of the balanced equation:

From the balanced equation, we know that:

2 moles of Al react with 2 moles of AlCl3

Moles of AlCl3 = (2/2) * Moles of Al

              = (2/2) * 0.5004 mol

              = 0.5004 mol (approximately)

To convert moles of AlCl3 to grams, we use the molar mass of aluminum chloride (AlCl3):

Molar mass of AlCl3 = 133.34 g/mol (approximately)

Mass of AlCl3 = Moles of AlCl3 * Molar mass of AlCl3

             = 0.5004 mol * 133.34 g/mol

             ≈ 66.72 g (approximately)

Therefore, the correct answer is:

c) You will need 23.6 g of chlorine gas and will produce 66.7 g of aluminum chloride.

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Answer:“If we’ve covered all of the potential sources, and we know the unique signature of the sand from these different sources, and we find it on a beach somewhere, then we basically know where it came from,” explained Barnard.

Explanation:

Answer:

"Hey, Nate, how's life?"

I don't know, it's alright

I've been dealin' with some things like every human being

And really didn't sleep much last night (last night)

"I'm sorry", that's fine

I just think I need a little me time

I just think I need a little free time

Little break from the shows and the bus rides (bus rides), yeah

Last year I had a breakdown

Thoughts tellin' me I'm lost gettin' too loud

Had to see a therapist, then I found out

Somethin' funny's goin' on up in my house

Yeah, I started thinkin' maybe I should move out

You know, pack my car, take a new route

Clean up my yard, get the noose out

Hang up my heart, let it air out (air out)

I've been searchin'

"What does that mean, Nate?"

I've been learning

Grabbin' my keepsakes, leavin' my burdens

Well, I brought a few with me, I'm not perfect

Lookin' at the view like, this concerns me

Pickin' up the cues, right? I'm quite nervous

Hate it when I lose sight, life gets blurry

And things might hurt me

It's prolly gonna be a long journey, but hey (but hey)

It's worth it, though

Cold world out there, kids, grab your coats

Been a minute, I know, now I'm back to roam

Lookin' for the antidote to crack the code

Pretty vivid, I admit it, I'm in classic mode

Don't need pity given to me, but I can't condone

Talkin' down to me, I'ma have to crack your nose for crackin' jokes

I'm lookin' for the map to hope, you seen it? (You seen it?)

Been makin' a whole lot of changes

Wrote a song about that, you should play it

I get scared when I walk on these stages

I look at the crowd and see so many faces, yeah

That's when I start to get anxious

That's when my thoughts can be dangerous

That's when I put on my makeup and drown in self-hatred

Forget what I'm saying, and

Where'd the beat go?

Oh, ain't that somethin'?

Drums came in, you ain't see that comin'

Hands on my head, can't tell me nothin'

Got a taste of the fame, had to pump my stomach

Throw it back up like I don't want it

Wipe my face, clean up my vomit

OCD, tryna push my buttons

I said don't touch it, now y'all done it

I can be critical, never typical

Intricate with every syllable, I'm a criminal

Intimate, but never political, pretty visual

Even if you hate it, I'll make it feel like you're in it, though

You call me what you wanna, but never call me forgettable

Leave you deep in thought, I could never swim in the kiddie pool

Way that I been thinkin' is cinematic, it's beautiful

Man, I don't know if I'm makin' movies or music videos (videos, videos, videos)

Yeah, the sales can rise

Doesn't mean much though when your health declines

See, we've all got somethin' that we trapped inside

That we try to suffocate, you know, hopin' it dies

Try to hold it underwater but it always survives

Then it comes up out of nowhere like an evil surprise

Then it hovers over you to tell you millions of lies

You don't relate to that? Must not be as crazy as I am

The point I'm makin' is the mind is a powerful place

And what you feed it can affect you in a powerful way

It's pretty cool, right? Yeah, but it's not always safe

Just hang with me, this'll only take a moment, okay?

Just think about it for a second, if you look at your face

Every day when you get up and think you'll never be great

You'll never be great, not because you're not, but the hate

Will always find a way to cut you up and murder your faith (woo!)

I am developin', take a look at the benefits

Nothin' to meddle with, I can never be delicate

Am I even relevant? That depends how you measure it

Take a measurement, then bag it up and give me the evidence

Pretty evident, dependable can never be tentative

I'm a gentleman, depending on if I think you're genuine

Pretty elegant, but not afraid to tell you to get a grip

Proper etiquette, I keep it to myself when I celebrate, ah (ah)

It's that time again

Better grab your balloons and invite your friends

Seatbelts back on, yeah, strap 'em in

Look at me, everybody, I'm smilin' big

On a road right now that I can't predict

Tell me "Tone that down, " but I can't resist

Y'all know that sound, better raise your fist

The search begins, I'm back, so enjoy the trip, huh

Explanation:

The formula for the compound that forms between lithium and each polyatomic ion is \(Li_{2}CO_{3}\), \(Li_{3}PO_{4}\), \(Li_{2} HPO_{4}\) and \(CH_{3}COOLi\).

A substance made up of two or more different chemical elements together in a certain ratio is known as a compound in chemistry. When the elements interact with one another, chemical bonds are formed that are difficult to break.

Only a few of the elements on the periodic table have a second letter that is lowercase after their initial capital letter. Therefore, you can tell an ion is polyatomic if it contains two capital letters together.

So, from the question

The compound that lithium will form with carbonate is \(Li_{2}CO_{3}\)

The compound that lithium will form with phosphate is \(Li_{3}PO_{4}\)

The compound that lithium will form with hydrogen phosphate is \(Li_{2} HPO_{4}\)

The compound that lithium will form with acetate is \(CH_{3}COOLi\)

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Explanation:

{c}^C . {d}^D / {a}^A . {b}^B

The moles of hydrogen which are produced from 57.5 grams of lithium is 8.21 grams.

Stoichiometry of the reaction gives idea about the relative amount of product produced by the reactant in terms of moles.

Given chemical reaction is:

2Li(s) + H₂O(l) → 2LiOH(aq) + H₂(g)

Moles of lithium will be calculated as:

n = W/M, where

n = 57.5 / 7 = 8.21 mol

From the stoichiometry of the reaction:

Mass of H₂ = (4.105mol)(2g/mol) = 8.21g

Hence required mass of hydrogen gas is 8.21g.

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The molecular formula of the compound with an empirical formula of C2H4 is C13H52

The molecular formula of a substance can be calculated using the following expression;

Molecular formula = (empirical formula)n

According to this question, a compound has an empirical formula of C2H4. Its molar mass was determined experimentally to be 179g/mol. The molecular formula is as follows:

179 = 28n

n = 6.4 × 2 = 13

Molecular formula = C26H52

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

We have

\(n = \frac{2.4 {10}^{23} }{6.02 \times {10}^{23} } = \frac{2.4}{6.02} \\ = 0.3986...\)

We have the final answer as

Hope this helps you

The molar ratio of citric acid to sodium hydroxide is 1:3.

When answering questions on Brainly, a question-answering bot should always be factually accurate, professional, and friendly. The bot should be concise and not provide extraneous amounts of detail. The bot should also use the following terms in its answer if required by the question.Here is an answer to the given question:

What is the molar ratio of citric acid to sodium hydroxide (refer to the reaction equation)?The chemical equation for the reaction between citric acid and sodium hydroxide is given below:3 NaOH + H3C6H5O7 → Na3C6H5O7 + 3 H2OCitric acid reacts with sodium hydroxide in the ratio of 1:3. Therefore, for every 1 mole of citric acid, 3 moles of sodium hydroxide react.  

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Answer:

??????????????????????????????‽??????????‽??‽?‽

Dependent variables could be height, number of leaves, biomass, etc. The constants could be the amount of water fed to the plants and other environmental conditions apart from the temperature.

Experimental variables could be independent, dependent, or constant.

Independent variables are supplied by the researcher and are often varied or manipulated to produce different effects on experimental systems or subjects.

Dependent variables are measured. Their values are often affected by whatever independent variable the researcher supplies.

Constant variables are uniform throughout the experimental groups or subjects.

Thus, in this case, the aim is to test the effect of temperature on the growth of a plant. The independent variable is the different temperatures.

The dependent variable would be any feature of the experimental plants that indicate growth. It could the height, the number of leaves, etc.

The constant variable would be other conditions the experimental plants are subjected to.

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The formula for pH at a weak acid-strong base titration's equivalence point must be used to determine the pH at each stage of the titration:

\(pH = pK_a + log \frac{[A^-]}{[HA]}\)

where pK a is the weak acid's acid dissociation constant, [A-] is the concentration of the acid's conjugate base, and [HA] is the acid's concentration.

The weak acid (formic acid) is at a concentration of 0.100 M at the start of the titration (0 mL of additional base), and the conjugate base (formate ion) is at a concentration of 0.00 M, resulting in a pH of:

\(pH = pK_a + log \frac{[A^-]}{[HA]} \)

\(= pK_a + log \frac{0}{0.100} \)

= pK_a + log(0)

We are unable to determine the pH at this time since the logarithm of 0 is undefinable.

The weak acid concentration falls as the titration goes along and more base is added, while the conjugate base concentration rises. The concentration of the weak acid is 15.0 mL when 15.0 mL of additional base is used.

\(0.100 M - \frac{0.200 M \times15 mL }{50 mL} \)

= 0.080 M,

and the concentration of the conjugate base is

\( \frac{0.200 M \times 15 mL}{50 mL} \)

= 0.060 M. The pH at this point is:

\(pH = pK_a + log \frac{[A^-]}{[HA]}\)

\(= pK_a + log \frac{0.060}{0.080} \)

= pK_a + log(0.75)

= pK_a + (-0.122)

You may use the same formula and the appropriate numbers for [A-] and [HA] to determine the pH at the other points in the titration.

It should be noted that the pH at the equivalence point (when the ratio of acid to base is equal) will be the same as the weak acid's pK a. Since the concentration of the weak acid is zero at the equivalence point, the pH is:

\(pH = pK_a + log \frac{[A^-]}{[HA]}\)

\(= pK_a + log \frac{[A^-]}{0}\)

\(= pK_a + log([A^-])\)

The pH at the equivalence point will be lower than the pK a of the weak acid since the logarithm of a number less than 1 has a negative value. Beyond the equivalence point, adding more base will cause the pH to continue to drop.

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Answer:

On average, agriculture accounts for 70 percent of global freshwater withdrawals. In the last 30 years, food production has increased by more than 100 percent. FAO estimates that about 60 percent more food will be needed by 2050 to meet the food requirements of a growing global population.

Explanation:

Because i learnt this before and i aced a test about it dont worry

A. the main group element with the valence electron configuration 3s23p1 is in the periodic group p- block element. it forms a monatomic ion with a charge of +3.

B. the main group element with the valence electron configuration 2s22p4 is in periodic group 4, p block element. it forms a monatomic ion with a charge of +4.

The periodic table, also known as the periodic table of the elements, is a rows and columns association of the chemical factors. it's miles widely used in chemistry, physics, and other sciences, and is typically visible as an icon of chemistry.

Periodic table, inside the full periodic desk of the factors, in chemistry, the organized array of all of the chemical factors in order of growing atomic wide variety—i.e., the whole wide variety of protons inside the atomic nucleus.

An atom includes a relevant nucleus which is surrounded by way of one or more negatively charged electrons. The nucleus is undoubtedly charged and consists of one or greater exceedingly heavy particles called protons and neutrons. Atoms are the primary building blocks of depend.

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Answer: 10.99

Explanation: because you take the Cao 13.9 and take CO2 which is 10.99 and it makes 24.8 . Which is CaCO3.

Decomposition reactions are the breakdown of chemical species into simpler parts. Decomposition reactions typically require energy input.

The mass of the CO2 gas that escaped  = 10.99 g.

Molecular mass of CaO = 56.07 g

                              CO\(_2\)  = 44.01 g

the mass of the CO2 gas that escaped  = 13.9 x 44.01/ 56.07

                            = 10.99 g.

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Answer:

Yes, you can apply water-based polyurethane over oil-based stain.

Explanation:

is OK to use a water-based polyurethane over an oil-based finish in good condition. You should remove grease, dirt and wax by scrubbing the surface with a wood prep/cleaner/de-glosser, or mineral spirits and synthetic steel wool. ... Apply the new water-based finish per label directions

water is to gas as liquid is to solid

I'm sure when you meant heat you meant energy

we can use the formula

energy = specific heat capacity × mass × difference in temperature

the specific heat capacity of water is 4200J

specific heat capacity by the way is the amount of energy needed to raise the temperature of a substance by one degree

so plugging in our values

energy = 4200 × 0.093 × 40 = 16129 joules

why you may ask is the mass 0.093 and not 93

Well because we must convert grams into kilograms by dividing by 1000 since 1000 grams is one kilogram

HOPE THIS HELPSS

Answer:

The correct answer is - 75 grams.

Explanation:

Half-life is the amount of time that is used by the given amount of substance or element to make it half of the initial amount of a particular radioactive substance.

Equation for alpha decay for radon

\(^222_{86}Rn\Rightarrow^{218}_{84}Po  \)

we need to calculate the left amount of radon after given time

using formula half life

\(N(t)=N_{0}e^{-\lambda t}\)

\(\lambda =\dfrac{0.693}{3.82}\)

\(\lambda=0.1814\)

\(N(3.82)=150\times e^{-0.1814\times3.82}\)

\(N(3.82)=75.0\ g\)

Thus, the left amount of radon is - 75 grams.

The options given, let's analyze each group to determine if they are both electron donating by resonance and electron withdrawing by induction when attached to a benzene ring, This group is electron-withdrawing by both resonance and induction, so it doesn't meet the criteria.

This group is electron-donating by resonance (due to the presence of lone pair electrons on the oxygen atom) and electron-withdrawing by induction due to the electronegativity of the oxygen atom. Therefore, it meets the criteria.
This group is electron-donating by both resonance lone pair electrons on the nitrogen atom) and induction (due to the partial positive charge on the nitrogen atom). Thus, it doesn't meet the criteria. This group is electron-donating by resonance lone pair electrons on the oxygen atom and electron-withdrawing by induction (due to the electronegativity of the oxygen atom. Therefore, it meets the criteria. This group is electron-withdrawing by both resonance and induction due to the high electronegativity of the fluorine atom, so it doesn't meet the criteria.

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Answer:

Aluminum, a member of the IIIA family, loses three electrons to form a 3+ cation. ... And all of them form an anion with a single negative charge. The VIA elements gain two electrons to form anions with a 2- charge. The VA elements gain three electrons to form anions with a 3- charge.

Answer:

(with reference to a solid) become or cause to become incorporated into a liquid so as to form a solution.

The molarity of the K2CrO4 solution would be 0.001254 M.

The molarity of a solution is defined as the number of moles of solute per liter of solution. To calculate the molarity of the K2CrO4 solution, we need to first determine the number of moles of K2CrO4 present in the 184.6 mg sample.

Calculate the number of moles of K2CrO4:

The molar mass of K2CrO4 is 294.19 g/mol.

mass of K2CrO4 = 184.6 mg = 0.1846 g

number of moles = mass/molar mass

number of moles = 0.1846 g / 294.19 g/mol = 0.000627 mol

Calculate the volume of the solution in liters:

We are given that the solution is made up to a final volume of 500.0 mL. To convert milliliters to liters, we divide by 1000.

volume = 500.0 mL ÷ 1000 mL/L = 0.500 L

Calculate the molarity:

Molarity = number of moles / volume of solution

Molarity = 0.000627 mol / 0.500 L = 0.001254 M

Therefore, the molarity of the K2CrO4 solution is 0.001254 M.

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Calculate the molarity. A 184.6-mg sample of K2CrO4, is dissolved in enough water to make 500.0 mL of solution.

Answer:

The iron present in the solution is reduced because of the presence of SCN⁻ ions in solution

Explanation:

The clue in this problem is the color of the solution:

A solution of Fe³⁻ is yellow but when the Fe³⁺ is reduced by an oxidant to Fe²⁺ the solution change to orange color.

The SCN⁻ ion is a reducing agent than, in presence of a substance that can be reducted as Fe³⁺ ion will promote the reaction. That means the best explanation is:

The percent composition of the carbon in the C₆H₁₂O₆ is 40 %.

The chemical compound is  C₆H₁₂O₆.

The molar mass of the compound  C₆H₁₂O₆ = 180 g/mol

The mass of the carbon = 12 g

The percent composition is as follows :

Percent composition of the carbon = ( mass of the carbon / total mass of the compound ) × 100 %

Percent composition of the carbon = ( 72 / 180 ) × 100 %

Percent composition of the carbon  = 40 %

Thus the percentage composition if the carbon is 40 percent in the chemical compound  C₆H₁₂O₆ that is glucose.

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