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Answer:

Molar mass of the diprotic acid is 424 grams

Explanation:

[hint: diprotic acid only contains 2 hydrogen protons]

Ionic equation:

[tex]{ \bf{2OH { }^{ - } _{(aq)} + 2H { }^{ + } _{(aq)}→ 2H _{2} O _{(l)} }}[/tex]

first, we get moles of potassium hydroxide in 28.94 ml :

[tex]{ \sf{1 \: l \: of \: KOH \: contains \: 0.3021 \: moles}} \\ { \sf{0.02894 \: l \: of \: KOH \: contain \: (0.02894 \times 0.3021) \: moles}} \\ { \underline{ = 0.008743 \: moles}}[/tex]

since mole ratio of diprotic acid : base is 2 : 2, moles are the same.

Therefore, moles of acid that reacted are 0.008743 moles.

[tex]{ \sf{0.008743 \: moles \: of \: acid \: weigh \: 3.7066 \: g}} \\ { \sf{1 \: mole \: of \: acid \: weighs \: ( \frac{1 \times 3.7066}{0.008743}) \: g }} \\ = { \underline{423.95 \: g \approx424 \: grams}}[/tex]

for the molar mass:

Answer:For example, rain (hydrosphere) falls from clouds in the atmosphere to the lithosphere and forms streams and rivers that provide drinking water for wildlife and humans as well as water for plant growth (biosphere). River action erodes banks (lithosphere) and uproots plants (biosphere) on the riverbanks.

Explanation:b

We have that examples of a connection between the hydrosphere and the

lithosphere are

Option A and B

The hydrosphere bears rain that falls in the atmosphere and creates water bodies on earth  by combining with the lithosphere

Therefore

Are  examples of a connection between the hydrosphere and the

lithosphere.

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Answer:

2nd one

Explanation:

Big bang echo other ones make no sense.

Answer:

The metals are located on the left and the non-metals are located on the right.

Explanation:

Hope this helps :)

Answer:

It is a mixture of denatured alcohol, water, and agents added to make the alcohol unpalatable to drink.

Answer:

837.9

Explanation:

Answer:

It's A. 120 cubic meters

Answer:

[tex]\boxed {\boxed {\sf 928.8 \ grams}}[/tex]

Explanation:

Density is the mass per unit volume of a substance. The following formula is used for calculating density.

[tex]\rho= \frac{m}{v}[/tex]

We know the density of aluminum is 2.70 grams per milliliter. The mass is unknown, but we know the piece of aluminum has a volume of 344 milliliters.

Substitute these values into the formula.

[tex]2.70 \ g/mL = \frac {m}{344 \ mL}[/tex]

We are solving for the mass, so we must isolate the variable m. It is being divided by 344 milliliters. The inverse operation of division is multiplication. Multiply both sides of the equation by 344 mL.

[tex]344 \ mL *2.70 \ g/mL = \frac {m}{344 \ mL} * 344 \ mL[/tex]

[tex]344 \ mL *2.70 \ g/mL =m[/tex]

The units of milliliters cancel.

[tex]344 *2.70 \ g=m[/tex]

[tex]928.8 \ g =m[/tex]

The mass of the piece of aluminum is 928.8 grams.

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Explanation:

the atomic number is the number of protons in the atom

Answer: 50.7 moles

Explanation:

given mass/ molecular mass

= 50.7/1

=50.7

Answer:

[tex]\boxed {\boxed {\sf 25.1 \ mol \ H_2}}[/tex]

Explanation:

We are asked to calculate the number of moles in 50.7 grams of hydrogen gas. To do this, we will use the molar mass or the mass of 1 mole of a substance. These values are found on the Periodic Table because they are equivalent to the atomic masses, but the units are grams per mole instead of atomic mass units.

Look up the molar mass of hydrogen (H).

Note that we are given grams of hydrogen gas. This is a diatomic molecule with 2 hydrogen atoms. The formula is H₂. Multiply the molar mass by 2 to find hydrogen gas's molar mass.

Now we can convert using dimensional analysis. Set up a ratio using the molar mass.

[tex]\frac {2.016 \ g \ H_2}{1 \ mol \ H_2}[/tex]

We are converting 50.7 grams to moles, so we multiply the ratio by this value.

[tex]50.7 \ g \ H_2 *\frac {2.016 \ g \ H_2}{1 \ mol \ H_2}[/tex]

Flip the ratio so the units of grams of hydrogen gas cancel.

[tex]50.7 \ g \ H_2 *\frac{1 \ mol \ H_2} {2.016 \ g \ H_2}[/tex]

[tex]50.7 \ *\frac{1 \ mol \ H_2} {2.016 }[/tex]

[tex]\frac {50.7} {2.016 } \ mol \ H_2[/tex]

[tex]25.14880952 \ mol \ H_2[/tex]

The original value of grams (50.7) has 3 significant figures, so our answer must have the same. For the number we calculated, that is the tenths place. The 4 in the hundredth place to the right tells us to leave the 1 in the tenths place.

[tex]25.1 \ mol \ H_2[/tex]

50.7 grams of hydrogen gas is equal to approximately 25.1 moles of hydrogen gas.

Answer:

1°C rise in temperature is equal to a rise of 59°F

Answer:

Hence 1℃ rise in temperature is equal to the rise in 59℉.

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Answer:

d. 20 protons and 22 neutrons

Atomic nuclei containing 20 protons and 22 neutrons. Thus, option D is correct.

An electron is defined as a subatomic particle which is charged negatively either bound to an atom or not it means free. The nucleus of an atom is made up of electron, proton and neutron. The electron is a basic particle and electron is not made of anything.

The nature of electron is free it means they are present freely in nature and consist of an atom.The main function of electron is that they play the role of negatively- charged component of an atom.

The electrons are primary source of current conducting and electrons number as well as atomic number of an element is always same or equal. There is no size of electron but the mass of electron is 9×10^-31.

Therefore, Atomic nuclei containing 20 protons and 22 neutrons. Thus, option D is correct.

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Answer with explanation:

1) general word equation=acid + metal= salt + hydrogen gas

chemical/balanced equation= 2HCl+Mg=MgCl2+H2

2)The gas thus formed is an effervescent carbon di oxide when calcium chloride reacts with hydrochloric acid. the carbon di oxide gas also acts as an extinguisher for fires. Hence the burning candle is extinguished.

Answer:

Cô cạn dung dịch B thu được bao nhiêu gam muối khan.

Answer:

The correct answer is D

Explanation:

more protons in the nucleus cause an increase in effective nuclear charge ,

Answer:

i hope this helps, also you might want to put it into your own words because this was directly from the answer key :)

Explanation:

Faustus Faustus is the protagonist of the play. He is a brilliant scholar who makes a deal with Lucifer to exchange his soul for magical power. He later regrets his decision, but it’s too late and his soul is carried away to hell.

Mephastophilis Mephastophilis is a demon that Faustus calls upon to help him with magic. He turns into Faustus's servant in his pact with the devil.

Valdes and Cornelius Valdes and Cornelius are friends of Faustus who teach him the art of black magic.

three scholars The three scholars are friends of Faustus who are concerned about his welfare.

Lucifer Lucifer (the devil) is Mephastophilis’s master. He makes a deal with Faustus.

Wagner Wagner is Faustus’s servant. He learns how to work magic from his master’s books.

clown The clown becomes Wagner's servant. He provides comic relief in the story.

good angel The good angel is a spirit that tries to get Faustus to repent.

evil angel The evil angel is a spirit that tempts Faustus to rebel against God and make a pact with the devil.

the pope The pope is the head of the Roman Catholic Church and symbolizes the religious beliefs that Faustus has abandoned.

horse-courser The horse-courser is a horse trader who purchases a horse from Faustus.

old man The old man is a mysterious figure who takes the place of the good and evil angels in the last scene of the play.

Answer:

Magnetic separation

Explanation:

Sand is non-magnetic whereas iron fillings can be used as magnets. So, they can be separated by a method which uses a magnet for separating a mixture. Magnetic separation is the process which uses magnetic force for the extraction of magnetic material from a mixture.

through magnet

although not writable answer but for gk even a blow of wind shall do

Answer:

More generally, astronomy studies everything that originates beyond Earth's atmosphere. Cosmology is a branch of astronomy that studies the universe as a whole. Astronomy is one of the oldest natural sciences. The early civilizations in recorded history made methodical observations of the night sky.

Answer:

Sulfuric acid or sulphuric acid, also known as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen and hydrogen, with the molecular formula H₂SO₄. It is a colorless, odorless and viscous liquid that is miscible with water.

Explanation:

Explanation:

Sulfuric acid is a colourless oily liquid. It is soluble in water with release of heat. It is corrosive to metals and tissue. The major use of sulfuric acid is in the production of fertilizers . Sulfuric acid, sulfuric also spelled sulfuric (H2so4) , also called oil of vitrod. Sulfuric acid is a very important commodity chemical , and a nation's sulfuric acid production is a good indicator of it's industrial strength.

The  orbital is occupied by an electron with the quantum numbers n=3, l=2 will be 3d where n is orbit and l is band the d orbital have 5 degenerate orbitals.

Orbitals are the well defined circular paths into which electron revolve around the nucleus in 2D mostly denoted by K L M N etc and all of them will be circular in the shape and non directional as well.

Orbitals are the 3D space of the nucleus where the probability of finding the electron will always be greater or maximum denoted by s p d and f and having shapes like s orbital is spherical shaped p orbital is in some other shape.

Therefore, orbital is occupied by an electron with the quantum numbers n=3, l=2 will be 3d where n is orbit and l is orbital and the d orbital have 5 degenerate orbital's.

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Answer:  149.9 ml

Explanation:  Do as the formula suggests:  D = M/V

0.8 g/ml = 119.9 grams/V

V = (119.9 grams)/(0.8 grams/ml) = 212.8 ml

Note how the grams cancel and the ml moves to the top.

Answer:  Technically, this cannot be answered, since none of the H atoms have a mass number assigned.  With the assumption noted delow, I calculate 1.012 as the average atomic mass.

Explanation:

My answer is based on assumed masses for the three H isotopes:

1H :   1 AMU

2H:   2 AMU   Deuterium

3H:    3AMU   Tritium

     AMU   Rel Abund.    Wt. Avg

1H 1     99.00%      0.99

2H 2       0.80%      0.016

3H 3       0.20%       0.006

              Sum   1.012

Answer:

There are three amino acids that have basic side chains at neutral pH. These are arginine (Arg), lysine (Lys), and histidine (His). Their side chains contain nitrogen and resemble ammonia, which is a base. Their pKa's are high enough that they tend to bind protons, gaining a positive charge in the process.

Answer :

arginine is basic amino acid because it's side chain group contains a full positive charge at the physiological pH. Histidine is also considered basic but it can have a positive or a neutral charge on its side chain group at the physiological pH

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Answer:

[tex]{ \sf{CH_{3}C - (CH_{3})(OH)CH(CH_{3})CH_{2} CH_{2} CH_{2}CH_{3}}}[/tex]

The chemical formula for sulfuric acid is H2SO4.

Detailed explanation:

This means that there are 2 atoms of hydrogen, 1 atom of sulfur, and 4 atoms of oxygen in a single molecule. Hope this helps!

The answer is H2SO4.