If 8.2 g of sodium ethanoate produced 560 cm3 of methane (at s.t.p.). which one of the following is the percentage yield of the reaction;
A 2.5
B 4.0
C 12.0
D 25.0

Answer:

This is man made and natural

Answer:

True

Explanation:

It is true that every element in the periodic table follows the Aufbau's principle.

The principle states that "the sublevels with lower energies are filled up before those with higher energies".

Answer:False

Explanation:

Answer:

Explanation:

In creating this list, one will have to start from the atom (which is the smallest in the list) to the giant polymer (which is the largest in the group). The arrangement below will also be based on there molecular weight.

oxygen molecule (this is the first because it is an atom)

water molecule (this is lighter in weight than carbon dioxide)

carbon dioxide

amino acid molecule (most amino acids have a lesser molecular weight than glucose)

glucose (has a molecular weight of 180.156 g/mol)

protein molecule (several proteins have a lesser molecular weight than starch)

starch molecule (has a molecular weight of 359.33 g/mol)

The arrangement of molecules in the ascending order is: oxygen, water, carbon dioxide, amino acid, glucose, starch, and protein.  

• The size of the molecules can be determined by knowing their molecular weights.  

• The sum of the atomic weights of the atoms in the molecule is known as the molecular weight of the molecule.  

• The molecular weight of water is 18 gram per mole, glucose 180.2 g/mol, starch 360 g/mol, carbon dioxide 44 g/mol, protein 20000 g/mol, amino acid for example glycine 75 g/mol, and oxygen 16 g/mol.  

Thus, the molecules can be arranged with the smallest to the largest as oxygen, water, carbon dioxide, amino acid, glucose, starch, and protein.

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adaptation may be i guess

Answer:

270

Explanation:

Once you add more mass to something the mass doesn’t go away you add more mass.

hope this helps!

Answer:

7.62 plug into the equation for freezing

0= 592/7.62x x 90

0 = 77.69x x 90

x=0

therefore according to balton's law, it is required to have 0 + 27.222222222 (balton's number) to get the energy required.

answer is 27.222222 rounded 27. cheers.

d. Ba₃(PO₄)₂(s)+6HNO₃(aq)

Double-Replacement reactions. Happens if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product  

To predict whether this reaction can occur or not is one of them, the precipitation reaction. A precipitation reaction occurs if two ionic compounds which are dissolved reacted to produce one of the products of the ion compound does not dissolve. Formation of these precipitating compounds that cause reactions can occur  

Because A precipitate is formed, then compounds of CO₃²⁻ and PO₄³⁻ except for Compounds of Li +, Na +, K +, Rb +, Cs +, and NH₄ + are generally included in the insoluble compound

So the reaction :

3Ba(NO₃)₂(aq)+2H₃PO₄(aq)⇒Ba₃(PO₄)₂(s)+6HNO₃(aq)

A precipitate is formed ⇒ Ba₃(PO₄)₂

Answer:

Diversity?

Explanation:

Think thats bio

Answer:

LI

Explanation:

There is three Li in the start but One Li after

Answer: The Answer was D. These people trolling. Look at the attachments I put on

Explanation:

An oxidation half reaction is one in which electrons are lost. Hence the reaction, Cr^3+(aq) ----> Cr(s) + 3e is an oxidation reaction.

The term oxidation has to do with the loss of electrons. When an oxidation half reaction takes place, a specie loose electrons. We will now look out for the reaction in which electron loss takes place.

Now, in option D, the reaction is Cr^3+(aq) ----> Cr(s) + 3e. Three electrons where lost here hence this is an oxidation half reaction.

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Answer:

D

Explanation:

Because speed is a scalar quantity which he has only magnitude and no direction while velocity is a vector quantity because it has both magnitude and direction.

Answer:

0.025 moles of NO₂  will produced

Explanation:

Given data:

Moles of NO₂ formed = ?

Volume of HNO₃ = 25.0 mL

Molarity of HNO₃ = 2 M

Solution:

Chemical equation:

Cu + 4HNO₃   →        Cu(NO₃)₂ + 2NO₂ + 2H₂O

Number of moles of HNO₃:

Molarity = number of moles /  volume in L

2M = number of moles / 0.025 L

Number of moles = 2 M × 0.025 L

Number of moles = 0.05 mol

Now we will compare the moles of HNO₃  with NO₂  from balance chemical equation.

                                  HNO₃            :          NO₂

                                      4                :            2

                                 0.05               :         2/4×0.05 =0.025

0.025 moles of NO₂  will produced.

Answer:rarrrrrrr

Explanation:

Answer:

The polyatomic cation that will react with MnO₄⁻ to form a neutral compound is NH₄⁺ (ammonium ion) to form NH₄MnO₄ (Ammonium permanganate).

Answer:

oxygen

Explanation:

plants use oxygen

Answer:

Basically, the more hot the state is, the more kinetic energy it will have. This means that answer D. would be right, as it goes from coldest to hottest states!

Answer:

The answer is D. solid, liquid, gas, plasma

Explanation:

Answer:  A wavelenghth is the distance between successive crests of one wave.

Answer:

B

Explanation:

Because , it is the answer .

Based on the information provided in the chart, the statement that is best supported is Atom X will donate electrons to Atom Y. Option A is the correct answer.

Atom X has 6 valence electrons, which means it has 6 electrons in its outermost energy level. Atom Y has 2 valence electrons, indicating that it has 2 electrons in its outermost energy level. In a chemical reaction, atoms tend to either donate or accept electrons to achieve a stable electron configuration. Option A is the correct answer.

Atom X has more valence electrons than Atom Y, suggesting that it is more likely to donate electrons. Since Atom Y has fewer valence electrons, it is more likely to accept electrons from Atom X. Therefore, based on the number of valence electrons, Atom X will donate electrons to Atom Y in order to achieve a stable electron configuration.

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Answer:

It’s caused by a disturbance.

It carries energy.

Explanation:

A wave is a disturbance that transmits energy from one point to another. It does no necessarily carry the particles or matter of the medium.

Waves usually carries energy. It is this energy they use in creating disturbances.

Not all waves carries matter; a good example is electromagnetic waves. Also, electromagnetic waves do not require a medium for propagation.

Answer:

Explanation:

Answer:

Element

Explanation:

It's C4 so there are four carbons.

Hope this helped! :))

Answer:

Explanation:

The new pressure can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we are finding the new pressure

[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]

From the question we have

[tex]P_2 = \frac{11.2 \times 0.86}{15} = \frac{9.632}{15} \\ = 0.64213333...[/tex]

We have the final answer as

Hope this helps you

Given:

Initial Volume [tex] \sf (V_1) [/tex] = 11.2 L

Initial Pressure [tex] \sf (P_1) [/tex] = 0.860 atm

Final Volume [tex] \sf (V_2) [/tex] = 15.0 L

To Find:

Final Pressure [tex] \sf (P_2) [/tex]

Concept/Theory:

[tex] \bf{ \underline{Boyle's \: Law} \: (Pressure - Volume \: Relationship)}[/tex]

"At constant temperature, the pressure of a fixed amount of gas varies inversely with the volume of the gas."

[tex] \bf{P \propto \dfrac{1}{V} \: (at \: constant \: T \: and \: n)}[/tex]

It can be also stated as "At constant temperature, the product of pressure and volume of fixed amount of a gas remains constant."

[tex] \bf{PV = Constant}[/tex]

If the initial pressure and volume of a fixed amount of gas at constant temperature are [tex] \sf (P_1) [/tex] & [tex] \sf (V_1) [/tex] and final pressure of the gas is [tex] \sf (P_2) [/tex] and volume occupied is [tex] \sf (V_2) [/tex], then according to Boyle's law;

[tex] \bf{P_1V_1 = P_2V_2 = Constant}[/tex]

OR

[tex] \bf{\dfrac{P_1}{P_2} = \dfrac{V_2}{V_1}}[/tex]

Answer:

By using Boyle's Law, we get:

[tex] \rm \longrightarrow \dfrac{0.860}{P_2} = \dfrac{15.0}{11.2} \\ \\ \rm \longrightarrow P_2 = \dfrac{11.2}{15.0} \times 0.860 \\ \\ \rm \longrightarrow P_2 = \dfrac{9.632}{15.0} \\ \\ \rm \longrightarrow P_2 = 0.642 \: atm[/tex]

[tex] \therefore [/tex] Final Pressure [tex] \sf (P_2) [/tex] = 0.642 atm

Wavelength  = 6.25 x 10⁻¹⁰ m

Energy=3.1805 x 10⁻¹⁶ J

Radiation energy is absorbed by photons

The energy in one photon can be formulated as

[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]

Where

h = Planck's constant (6,626.10⁻³⁴ Js)

f = Frequency of electromagnetic waves

f = c / λ

c = speed of light

= 3.10⁸

λ = wavelength

Frequency : 4.8 x 10¹⁷ /s

the wavelength  :

[tex]\tt \lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3.10^8}{4.8.10^{17}}=6.25\times 10^{-10}~m[/tex]

Energy :

[tex]\tt E=6.626.10^{-34}\times 4.8\times 10^{17}=3.1805\times 10^{-16}~J[/tex]

Sorry,for table 3 , I can't find it

Answer:

all of the above

Explanation:

a hypothesis is indeed the second step. it also can be tested since you made it beforehand. it also is supposed to be educated. so all of the above.

Answer:

All of the above

Explanation:

1. Q = 112.8 kJ

2. Q = 5.01 kJ

The heat to change the phase can be formulated :

Q = mLf (melting/freezing)

Q = mLv (vaporization/condensation)

Lf=latent heat of fusion

Lv=latent heat of vaporization

1. m=50 g=0.05 kg

Lv for water = 2256 kJ/kg

[tex]\tt Q=m.L_v\\\\Q=0.05\times 2256\\\\Q=\boxed{\bold{112.8~kJ}}[/tex]

2. m=15 g=0.015 kg

Lf for water = 334 kj/kg

[tex]\tt Q=m.L_f\\\\Q=0.015\times 334\\\\Q=\boxed{\bold{5.01~kJ}}[/tex]

Answer:

Newton's third law

Explanation:

A fish swimming uses its fins to push the water backward making it swim forward is obeying Newton's third law of motion.

Newton's third law of motion states that "action and reaction are equal and opposite".

When the fish uses its fin to push the water backward, it reacts by being propelled in the opposite direction which is in the forward sense.

The third law is clear indicator that forces are always in pairs. As the fish swims, a net force between the oppositely directed forces do not cancel out.

Answer:

Any type of Ferromagnetic metals a quick and easy example is a nail made out of iron, where as a penny made out of zinc and copper both of them being non magnetic.

Explanation:

Answer:

The galaxies outside of our own are moving away from us, and the ones that are farthest away are moving the fastest. This means that no matter what galaxy you happen to be in, all the other galaxies are moving away from you.

However, the galaxies are not moving through space, they are moving in space, because space is also moving. In other words, the universe has no center; everything is moving away from everything else. If you imagine a grid of space with a galaxy every million light years or so, after enough time passes this grid will stretch out so that the galaxies are spread to every two million light years, and so on, possibly into infinity. The universe encompasses everything in existence, from the smallest atom to the largest galaxy; since forming some 13.7 billion years ago in the Big Bang, it has been expanding and may be infinite in its scope. The part of the universe of which we have knowledge is called the observable universe, the region around Earth from which light has had time to reach us.

One famous analogy to explain the expanding universe is imagining the universe like a loaf of raisin bread dough. As the bread rises and expands, the raisins move farther away from each other, but they are still stuck in the dough. In the case of the universe, there may be raisins out there that we can’t see any more because they have moved away so fast that their light has never reached Earth. Fortunately, gravity is in control of things at the local level and keeps our raisins together.The American astronomer Edwin Hubble made the observations in 1925 and was the first to prove that the universe is expanding. He proved that there is a direct relationship between the speeds of distant galaxies and their distances from Earth. This is now known as Hubble’s Law. The Hubble Space Telescope was named after him, and the single number that describes the rate of the cosmic expansion, relating the apparent recession velocities of external galaxies to their distance, is called the Hubble Constant. It might be easier to explain about the beginning of the universe and the Big Bang Theory, than to talk about how it will end. It is possible that the universe will last forever, or it may be crushed out of existence in a reverse of the Big Bang scenario, but that would be so far in the future that it might as well be infinite. Until recently, cosmologists (the scientists who study the universe) assumed that the rate of the universe’s expansion was slowing because of the effects of gravity. However, current research indicates that the universe may expand to eternity. But research continues and new studies of supernovae in remote galaxies and a force called dark energy may modify the possible fates of the universe.

Explanation:

I hope I help :))

The big bang theory states that the universe started from a single dense point. This single point stretched and inflated gradually because of the expansion. The light from the galaxy shows an increase in the wavelength due to this expansion.

By looking at ultraviolet light, astronomers can tell which stars are forming in different galaxies and where they’re forming inside those galaxies. The ultraviolet and visible light coming from the most distant galaxies is converted into infrared light on its way through the expanding universe.

As the universe is expanding the galaxies are moving away from us. There is a shift in the wavelength of the light coming from these galaxies. This shift in the wavelength is referred to as redshift. This is because an expansion of the universe causes an increase in the distance between the two crests of the wave which results in the wavelength increase.

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