PLEASE ANSWER ILL GIVE BRAIN!!!

Answer:

B. 6

Explanation:

Isotope given:

                      ¹⁴₆C

In specie written as this;  

  Superscript  = Mass number

  Subscript  = Atomic number

To find the protons, it is the same as the atomic number;

               Protons  = Atomic number  = 6

Neutrons have no charges;

Neutrons  = Mass number - Atomic number  =

 Neutrons  = 14 - 6  = 8

The number of electrons is the same as the atomic number = 6

Answer:

λ  =  1.5 m

Explanation:

Given data:

Speed of wave = 1500 m/s

Frequency of sound = 1000 Hz

Wavelength of sound = ?

Solution:

Speed of wave = frequency × wavelength

by putting values,

1500 m/s  = 1000 Hz ×  λ

λ  =  1500 m/s  / 1000 s⁻¹     (Hz =  s⁻¹ )

λ  =  1.5 m

Answer: 1.5

Explanation:

Well first you do

1500/ 1000= 1.5 which mean

The wavelength is 1.5

Answer:

0.967mole

Explanation:

Given parameters:

Volume of NH₄Cl  = 21.67L

Unknown:

Number of moles  = ?

Solution:

We assume that the volume was taken at standard temperature and pressure,

 Then;

  Number of moles  = [tex]\frac{volume }{22.4L}[/tex]  

 Number of moles  = [tex]\frac{21.67}{22.4}[/tex]   = 0.967mole

Answer:

(c) only solute present

Explanation:

In chemistry, the mole fraction, denoted by X, refers to the number of moles of a substance in a compound/mixture divided by the total number of substances in the same compound or mixture.

In this case, we can say that mole fraction represents the number of solutes to the number of solutes and solvent in the solution i.e. X = nA/nA + nB

Where; nA = number of solutes

nB = number of solvent

X = mole fraction.

Based on this analogy, When the mole fraction of solute is 1, there is only solute present. That is; X = 1 / 1 + 0

X = 1/1 = 1.

Pair of compounds have the same empirical formula :C₂H₂ and C₆H₆

Given

Carbon compound

Required

The same empirical formula

Solution

The empirical formula is the smallest comparison of atoms of compound forming elements.  

A molecular formula is a formula that shows the number of atomic elements that make up a compound.  

(empirical formula) n = molecular formula  

C₂H₂ and C₆H₆

Empirical formula CH

(CH)₂=C₂H₂

(CH)₆=C₆H₆

C₂H₆ and C₃H₈

C₂H₆: Empirical formula CH₃

C₃H₈: Empirical formula C₃H₈

C₂H₅OH and CH₃OH ⇒ Empirical formula

CH₃CHO: Empirical formula : CH₃CHO

CH₃COOH: Empirical formula CH₂O

Answer:

Oxygen receives two electrons from magnesium.

Explanation:

Hello!

In this case, considering the chemical reaction by which magnesium oxide is produced:

[tex]2Mg+O_2\rightarrow 2MgO[/tex]

In that case, if we show up the oxidation states, we have:

[tex]2Mg^0+O_2\rightarrow 2Mg^{2+}O^{2-}[/tex]

In such a way, since metals, like magnesium, have the capacity to lose electrons, rather than receive them, we infer why it turns out with +2 rather than -2; thus, we the correct answer is "oxygen receives two electrons from magnesium." because it results with -2 in MgO.

Best regards!

Answer:

Oxygen receives two electrons from magnesium.

Explanation:

Answer:

xii. B. Smelting

xiii. D. Carbon

Explanation:

Smelting is known to be a process by which a metal is gotten. It is gotten either as the element or as a simple compound. This is obtained from metal's ore by heating. The heating can be done ordinarily in the presence of oxidizing agents, like air, or reducing agents, carbon e.g coke.

Zinc is gotten after Zinc oxide is heated in the presence of carbon.

This process is smelting.

Concentrated tetraoxosulphate acid is a strong dehydrating agent. It has the ability to char wood, paper, or sugar, leaving a carbonaceous residue. The charring effect is as a result of the carbon that is found in the wood.

The acid sucks in the oxygen and hydrogen, leaving behind the carbon; this results in the charring effect.

Answer: There are [tex]10.5\times 10^{23}[/tex] formula units in 1.75 mol sample of NaCl.

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

1 mole of NaCl contains = [tex]6.023\times 10^{23}[/tex] formula units

Thus 1.75 mol of NaCl contains = [tex]\frac{6.023\times 10^{23}}{1}\times 1.75=10.5\times 10^{23}[/tex] formula units

Thus there are [tex]10.5\times 10^{23}[/tex] formula units in 1.75 mol sample of NaCl.

Answer:

The postulate that all pure samples of a particular chemical compound contain the same elements  combined in the same proportion by mass.

Explanation:

The law of constant composition (or definite proportion) states that all pure samples of a particular chemical compound contain the same elements  combined in the same proportion by mass.

This law implies that irrespective of the source of the sample of the compound or the method by which the sample was prepared, as long as the sample is pure, the elements present in the compound are always combined in a specific ratio by mass. For example, water has the molecular formula H₂O. Irrespective of the water source, for example, tap-water, lake, stream, river or rainfall, each pure sample of water will have the constant composition of 2 atoms of hydrogen to one atom of oxygen.

The given compound exists as XO in nature. Therefore, irrespective of the source or method of preparation, every sample of this compound should have the formula XO. Since the compound prepared by the scientist was XO₂, therefore, the postulate that all pure samples of a particular chemical compound contain the same elements  combined in the same proportion by mass was violated by the scientist. The scientist must have prepared a different compound of the elemental compositions.

Answer:

D. 2NO2(g) → N204(9)

Explanation:

A p e x

2NO[tex]_2[/tex](g) → N[tex]_2[/tex]O[tex]_4[/tex](g) reactions would have a decrease in entropy. Therefore, the correct option is option D.

Entropy is a measureable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty. From classical thermodynamic, where it was originally recognized, towards the microscopic explanation of nature within statistical physics, the name and concept are employed in a variety of disciplines.

It has numerous applications in physics and chemistry, biological systems and how they relate to life, cosmology, economics, society, weather science, and information systems, especially the exchange of information. 2NO[tex]_2[/tex](g) → N[tex]_2[/tex]O[tex]_4[/tex](g) reactions would have a decrease in entropy.

Therefore, the correct option is option D.

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Answer:

False

Explanation:

I took the quiz and got it right

The given orbital diagram are iron and symbol for the element is Fe

Orbital diagrams are a pictorial description of electrons in an atom and where electron go in atom then we have to follow three rules, and the first one being the Auf bau Principle, the Auf bau Principle states that each electron occupies the lowest energy orbital  first filled and the second is pauli exclusion principle in which only two electron are present which is in opposite spin and third is hunds rule of maximum multiplicity in which pairing of electron is not possible until orbital are singly occupied this rules are used for filling the electron here given orbital diagram in which 1s²2s²2p⁶3s²3p⁶4s²3d⁶ means the element is iron and symbol of this element is Fe

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Answer:

yes, some can

Explanation:

because like salt an other compounds by being decomposed

Answer:

720 pencils

Explanation:

The parameter given are;

The unit quantity by which the pencils are sold = 1 gross

The number of pencils Daffodil orders = 5 gross of pencils

One gross is a quantity equal to twelve dozens

Therefore, we can write;

1 gross = 12 × 12 = 144

From which we have;

5 gross = 5 × 144 = 720

Which gives;

For the 5 gross of pencils Daffodil orders, she receives 720 pencils

Answer:

I'm not sure but I think the answer is electrons, protons and neutrons.

In the given question, 136293840 seconds are present in 4.3 years.

A second is a unit of time that is equal to 1/60th of a minute and is used to measure short periods of time.

To convert 4.3 years to seconds, we can use the following conversion factors:

1 year = 365.25 days (accounting for leap years)

1 day = 24 hours

1 hour = 60 minutes

1 minute = 60 seconds

So, we can start by multiplying the number of years by the number of days per year:

4.3 years [tex]\times[/tex] 365.25 days/year = 1577.475 days

Next, we can multiply the number of days by the number of hours per day:

1577.475 days [tex]\times[/tex] 24 hours/day = 37859.4 hours

Then, we can multiply the number of hours by the number of minutes per hour:

37859.4 hours [tex]\times[/tex] 60 minutes/hour = 2271564 minutes

Finally, we can multiply the number of minutes by the number of seconds per minute to get the total number of seconds:

2271564 minutes [tex]\times[/tex] 60 seconds/minute = 136293840 seconds

Therefore, in 4.3 years there are approximately 136293840 seconds.

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Answer:

answer is a because drugs do so to the person.

Answer:

Cr2O3

Explanation:

To find the empirical formula, which is the smallest whole number ratio of a compound, the following is done:

68.4% Cr = 68.4g of Chromium

31.6% O = 31.6g of Oxygen

Since, Cr = 52, O = 16, divide each mass by their respective atomic mass to convert to moles.

Cr = 68.4/52 = 1.315 mol

O = 31.6/16 = 1.975 mol

- Next, we divide each mole value by the smallest value (1.315mol)

Cr = 1.315/1.315 = 1

O = 1.975/1.315 = 1.50

The ratio or Cr to O is 1:1.5

We multiply this ratio by 2 to get the whole number ratio as follows:

2 × 1: 2 × 1.5

2:3

Hence, the empirical formula of Cr and oxygen is Cr2O3.

Answer:

The answer is B. Van der Waals forces are weaker than ionic and covalent bonds.

Explanation:

In general, if we arrange these molecular forces from the strongest to weakest, it would be like this:

Covalent bonds > Ionic bonds > Hydrogen bonds > Dipole-Dipole Interactions > Van der Waals forces

Covalent bonds are known to have the strongest and most stable bonds since they go deep and into the inter-molecular state. A diamond is an example of a compound with this characteristic bond.

Ionic bonds are the next strongest molecular bond following covalent bonds. This is due to the protons and electrons causing an electro-static force which results to the strong bonds. An example would be Sodium Chloride (NaCl), which when separated is Na⁺ and Cl⁻.

Van der Waals forces, also known as Dispersion forces, are the weakest type of molecular bonds. They are only formed through residual molecular attractions when molecules pass by each other. It doesn't even last long due to the uneven electron dispersion. It can be made stronger by adding more electrons in the molecule. This kind of molecular bonds appear in non-polar molecules such as carbon dioxide.

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The change that Hydrogen Bonds are most likely responsible for would be:

B). Causes salts to quickly dissolve in water.

Thus, option B is the correct answer.

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Answer:

  B)  2.87 L

Explanation:

A mole of any gas at STP has a volume of about 22.412 liters. So, 0.128 moles of gas will have a volume of ...

  0.128 · 22.412 L ≈ 2.87 L

Answer:

Explanation:

Answer:

See explanation

Explanation:

You see, we must cast our minds back to Charles' law. Charles' law gives the relationship between the volume of a gas and temperature of the gas.

Now, Micheal left the balloon outside at a particular temperature and volume the previous night. Overnight, the temperature dropped significantly and so must the volume of the gas in the balloon!

Remember that Charles' law states that, the volume of a given mass of gas is directly proportional to its absolute temperature at constant pressure. Since the pressure was held constant, the drop in the volume of gas in the balloon can be accounted for by the drop in temperature overnight.

Answer:

O Trilobites

Explanation:

The first mass extinction that occurred between the Paleozoic and the Mesozoic era caused the extinction of the trilobites.

Extinction are catastrophic events that causes the loss of organisms on the earth surface. Several factors can lead to extinction.

Boyle's law states that the pressure of the given quantity inversely varies with its volume at a constant temperature.

Answer:

because I make eggs and they taste delicious

Answer:

Conclusion

Explanation:

Answer:

3

Explanation:

Answer:

See explanation

Explanation:

Number of moles of glucose in 566g = 566g/180g/mol = 3.14 moles

Number of moles of oxygen atoms in 1 mole of glucose= 6 * 16g/16g/mol = 6 moles.

There are 6 moles of oxygen in 1 mole of glucose

x moles of oxygen is therefore present in 3.14 moles of glucose

x = 6 * 3.14/ 1 = 18.84 moles of oxygen

1 mole of oxygen  contains 6.02 * 10^23 atoms of oxygen

18.84 moles of oxygen contains 18.84 *  6.02 * 10^23 atoms = 1.14 * 10^25 atoms of oxygen.

Number of moles of sodium hydroxide in 43g of NaOH = 43g/40g/mol = 1.075 moles

1 mole of NaOH contains 6.02 * 10^23 molecules of NaOH

1.075 moles of NaOH contains 1.075 moles  * 6.02 * 10^23 molecules / 1 mole of NaOH = 6.47 * 10^23 molecules of NaOH

Number of moles of atoms fluorine in SF6 = 6 * 19 g/19 g/mol = 6 mole of F atoms

1 mole of SF6 contains 6.02 * 10^23 molecules of SF6

x moles of SF6 contains 5.5 x 10^24 molecules of SF6

X = 5.5 x 10^24 molecules * 1/ 6.02 * 10^23 molecules

X = 9 moles of SF6

If 1 mole of SF6 contains 6 atoms of F

9 moles of SF6 will contain 9 * 6/1 = 54 atoms of F

Balanced equation :

2Al +6HCI⇒ 3H₂ + 2AlCI₃

Given

Reaction (unbalanced)

Al +HCI⇒ H₂ + ALCI₃

Required

Balanced equation

Solution

Give a coefficient

aAl +bHCI⇒ cH₂ + AlCI₃

Al, left = a, right=1⇒a= 1

Cl, left = b, right=3⇒b=3

H, left = b, right=2c⇒b=2c⇒3=2c⇒c=3/2

The equation becomes :

Al +3HCI⇒ 3/2H₂ + AlCI₃ x 2

2Al +6HCI⇒ 3H₂ + 2AlCI₃

Answer:

Where are all my chemistry geniuses at?

1. The pattern of electronegativities would increase as you go across a period and would decrease as you go down a group in the periodic table.

2.  There is a correlation between electronegativity and atomic radius.  As electronegativity increases, atomic radius decreases. As electronegativity decreases, atomic radius increases. This would make sense because as a atomic radius increases, them more farther away the electrons are away from the nucleus because of their many subshells  making it less electronegative. As atomic radius decreases, the electrons are more closer to the nucleus because of their few subshells making the element more electronegative.

3. There is a correlation between ionization energy and electronegativity.  As electronegativity increases, ionization energy increases as well. If it decreases, ionization energy decreases too. This makes sense because the more electronegativity the element, the more they are closer to the nucleus(making them harder to remove) and the more desperate for an electron the atom is.

Explanation:

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