In which field(s) is knowledge about how science works important?
A. Medicine
B. All of these are correct
C. Law
D. Politics
E. Agriculture

A substance that cannot be converted into another substance is known as an element. Each type of atom that makes up an element is unique. The correct option is A.

A substance whose atoms all contain the same number of protons is said to constitute an element; alternatively, all the atoms of a certain element must contain the same number of protons. Chemical reactions cannot degrade elements since they are the simplest chemical forms.

A compound is created when two or more components join chemically in a predetermined mass ratio.

Thus the correct option is A.

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Answer:

    The mass was there all along, it was just in the air. The weight of the oxygen from the air is not weighed in the beginning, only at the end as part of the product, making it seem like there is a total mass change.

8 minutes and 25 seconds is the same as 8.25 in decimal form.

Divide by 60 minutes.

60 / 8.25 = 7.27 miles per hour

Best of Luck!

Answer:

c

Explanation:

From the equation, we can say that we need thrice the number of hydrogen than that of nitrogen

we are given 3 moles of nitrogen and 11 moles of hydrogen

but thrice the number of moles of nitrogen is 9, hence we have hydrogen in excess or Hydrogen is the excess reagent

Since we had 11 moles of Hydrogen and we only needed 9, 2 moles of hydrogen are left over

From the equation, we can see that the moles of ammonia formed will be twice the moles of nitrogen

Since 3 moles of nitrogen are used, the reaction will give us 6 moles of Ammonia and NOT 12 moles, therefore c is the correct answer

Since we have hydrogen in excess, our reaction is being limited because we have less Nitrogen, Hence Nitrogen is the Limiting Reagent

Option C is the only false statement

The false statement is that "12.0 moles of ammonia are produced"

According to the equation of reaction:

N₂  +  3H₂  >>>>>  2NH₃

1  mole of N₂ reacts with 3 moles of H₂

3 moles of N₂ will react with 9 moles of H₂

Since 3 moles of N₂ is said to react with 11 moles of H₂ (instead of 9 moles of H₂), H₂ is in excess by 2 moles. That is, N₂ is the limiting reactant.

Since N₂ is the limiting reactant:

1 mole of  N₂ produces 2 moles of NH₃

3 moles of N₂ will produce 6 moles of NH₃

Therefore, we can conclude that:

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Answer:

128 neutrons

Explanation:

How many neutrons are there in 8 molecules of [tex]^{19} _9 F_2[/tex]?

Step 1: Calculate the number of neutrons in 1 atom of F.

The atomic number (z) of F is 9 and its mass number (A) is 19. We can calculate the number of neutrons using the following expression.

n⁰ = A - Z = 19 - 9 = 10

Step 2: Calculate the number of neutrons in 1 molecule of F₂.

1 molecule of F₂ contains 2 atoms of F. The number of neutrons in  1 molecule of F₂ is:

(8 n⁰/1 atom F) × (2 atom F/1 molecule F₂) = 16 n⁰/1 molecule F₂

Step 3: Calculate the number of neutrons in 8 molecules of F₂

8 molecule F₂ × 16 n⁰/1 molecule F₂ = 128 n⁰

Answer:

Bo

Explanation:

Bo is not a element

Explanation:

4hr 30 m = 270 min

270/ 26.1 = 10. 34

1 mile per 10.34 mins

Answer:

Copper(I) chloride, commonly called cuprous chloride, is the lower chloride of copper, with the formula CuCl. The substance is a white solid sparingly soluble in water, but very soluble in concentrated hydrochloric acid. Impure samples appear green due to the presence of copper(II) chloride.

Explanation:

Please mark me brainliest

Given :

Mass of object , M = 14 g .

Volume of object , V = 3.5 mL .

To Find :

The density of the object .

Solution :

Density of an object is given by :

[tex]Density=\dfrac{Mass}{Volume}\\\\\rho=\dfrac{M}{V}\\\\\rho=\dfrac{14}{3.5}\ g/mL\\\\\rho=4\ g/mL[/tex]

Therefore , the density is 4 g/mL .

Hence , this is the required solution .

Answer:All are chemical compounds.

Answer:

It is basic.

Explanation:

Bases can neutralize acids.

Answer:

First, the direct method requires recording the total mass of solution, and then evaporating off the solvent. The solid left behind is the solute, which is then weighed and used to calculate mass percent. Density can also be used to determine the mass percent of an unknown concentration.

in my opinion:)

Answer:

[tex]m=4.21g[/tex]

Explanation:

Hello,

In this case, by using the ideal gas equation:

[tex]PV=nRT[/tex]

We can compute the mass of neon gas at the given conditions by firstly computing the moles and also considering the temperature in kelvins (298K):

[tex]n=\frac{PV}{RT}=\frac{1.02atm*5.00L}{0.082\frac{atm*L}{mol*K}*298K}\\ \\n=0.209mol[/tex]

Finally, by using the atomic mass of neon gas (20.18g/mol) we compute the required mass to fill the 5.00-L container:

[tex]m=0.209mol*\frac{20.18g}{1mol}\\ \\m=4.21g[/tex]

Best regards.

The mass of neon gas will be "4.21 g".

Given:

By using Ideal Gas Equation,

⇒ [tex]PV = nRT[/tex]

or,

⇒    [tex]n = \frac{PV}{RT}[/tex]

By substituting the values,

         [tex]= \frac{1.02\times 5.00}{0.082\times 298}[/tex]

         [tex]= 0.209 \ mol[/tex]

hence,

The Mass will be:

= [tex]0.209\times \frac{20.18}{1}[/tex]

= [tex]4.21 \ g[/tex]

Thus the above answer is right.

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The image of the bonds are missing, so i have attached it.

Answer:

A) - Sigma bond

-Sp³ and Sp³

- None

B) - Sigma and pi bond

- Sp² of C and p of O

- p of C and P of O

Explanation:

A) For compound 1;

- the molecular orbital type is sigma bond due to the end-to-end overlapping.

- Atomic orbitals in the sigma bond will be Sp³ and Sp³

- Atomic orbitals in the pi bond would be nil because there is no pi bond.

B) For compound 2;

- the molecular orbital type is sigma and pi bond

-Atomic orbitals in the sigma bond would be Sp² of C and p of O

- The Atomic orbitals in the pi bond will be; p of C and p of O

Answer:

D. Mathematical

Explanation:

Answer:

See explanation and image attached

Explanation:

When an alkene is reacted with cold, dilute and alkaline KMnO4, the product of the reaction is a 1,2-diol (vicinal diol). The products exhibit a “syn” stereochemistry with the addition of the two -OH groups to the same side of the alkene.

The reaction of cyclopentene with cold, dilute, alkaline KMnO4 is shown in the image attached.

In the given query, when cyclopentene is reacted with cold alkaline [tex]\rm KMnO_4[/tex], the product formed is cis-1,2-cyclopentanedicarboxylic acid (image attached below).

The reaction proceeds via oxidative cleavage of the double bond in cyclopentene to form two carboxylic acid groups.

The potassium permanganate ([tex]\rm KMnO_4[/tex]) acts as a strong oxidizing agent and cleaves the double bond to form two carboxylic acid groups.

The reaction can be represented as follows:

Cyclopentene + cold alkaline [tex]\rm KMnO_4 \rightarrow[/tex] cis-1,2-cyclopentanedicarboxylic acid

Therefore, the product, cis-1,2-cyclopentanedicarboxylic acid (refer to the attached image below), has a cyclopentane ring with two carboxylic acid groups attached to the 1 and 2 carbons, respectively.

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Answer:

C

Explanation:

its not A since its actually the atoms in exactly 12g of crabon-12

-not B since its grams not kilograms

-not D since it says "gram" which would mean that we measure the particles in a gram instead of a mole

Avogadro's number is the number of atoms, molecules, ions, formula units, or other particles in a mole of a substance. Therefore, option (c) is correct.

The Avogadro constant commonly denoted [tex]N_A[/tex] is the proportionality factor that the number of constituent particles such as molecules, atoms, or ions in one mole of a sample.

Avogadro's number is a constant with an exact value of 6.022 × 10²³ reciprocal moles. Avogadro's number is named by Stanislao Cannizzaro after the Italian scientist Amedeo Avogadro, who explained it four years after Avogadro's death.

The numerical value of the Avogadro constant is in reciprocal moles, a dimensionless number known as the Avogadro number. The value of the Avogadro constant, the mass of one mole of a chemical compound, in grams.

It is numerically equal to the average mass of one molecule of the compound in daltons. One dalton is 1/12 of the mass of one carbon-12 atom, which is the mass of one nucleon.

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Answer:

n = 1.3 x 10¹⁸ photons

Explanation:

First we need to calculate the amount of energy released in given time:

E = Pt

where,

E = Energy  = ?

P = Power = 4 mW = 0.004 W

t = time = 115 s

Therefore,

E = (0.004 W)(115 s)

E = 0.46 J

Now, this energy can be given in forms of photons as:

E = nhc/λ

where,

n = No. of photons = ?

h = Plank's Constant = 6.626 x 10⁻³⁴ J.s

c = speed of light = 3 x 10⁸ m/s

λ = wavelength of light = 5650 x 10⁻¹⁰ m

Therefore,

0.46 J = n(6.626 x 10⁻³⁴ J.s)(3 x 10⁸ m/s)/(5650 x 10⁻¹⁰ m)

n = (0.46 J)/(3.5 x 10⁻¹⁹ J)

n = 1.3 x 10¹⁸ photons

Answer:

1.308 x 10¹⁸ photons were emitted from the laser pointer.

Explanation:

Given;

wavelength of the photon, λ = 5650  Å = 5650 x 10⁻¹⁰ m

power emitted by the source, P = 4 mW = 4 x 10⁻³ W

time of photon emission, t = 115 s

The energy of a single photon is given by;

E = hf

f = c / λ

[tex]E = \frac{h c }{\lambda}[/tex]

where;

c is speed of light = 3 x 10⁸ m/s

h is Planck's constant = 6.626 x 10⁻³⁴ Js

[tex]E = \frac{(6.626 *10^{-34}) (3*10^8) }{5650*10^{-10}}\\\\ E = 3.518*10^{-19} \ J[/tex]

Energy of the source (laser pointer) = P x t

                                                           = (4 x 10⁻³ W) (115 s )

                                                           = 0.46 J

If no energy is lost, then emitted energy by the source must be equal to total energy of then photons;

[tex]E_T = n E_{photon}\\\\n = \frac{E_T}{E_{photon}}\\\\n = \frac{0.46}{3.518*10^{-19}}\\\\n = 1.308*10^{18} \ photons[/tex]

Therefore, 1.308 x 10¹⁸ photons were emitted from the laser pointer.

Answer: [tex]\Delta H_{vap}[/tex] = 55.1 kJ/mol

Explanation: Molar Enthalpy of Vaporization([tex]\Delta H_{vap}[/tex] ) is the energy needed to change 1 mol of a substance from liquid to gas at constant temperature and pressure.

For the 2-hydroxybiphenyl, there two temperatures and 2 pressures. In this case, use Clausius-Clapeyron equation:

[tex]ln\frac{P_{2}}{P_{1}}=\frac{\Delta H_{vap}}{R} (\frac{1}{T_{1}}-\frac{1}{T_{2}} )[/tex]

[tex]\Delta H_{vap}[/tex] is in J/mol:

1) Temperature in K

[tex]T_{1}=[/tex] 286  +273 = 559K

[tex]T_{2}[/tex] = 145 + 273 = 418K

2) Both pressure in Pa

[tex]P_{1}[/tex] = 101325Pa

[tex]P_{2}[/tex] = 14*133 = 1862Pa

Since molar enthalpy is in Joules, gas constant R is 8.3145J/mol.K

Replacing into the equation:

[tex]ln\frac{1862}{101325}}=\frac{\Delta H_{vap}}{8.3145} (\frac{1}{559}-\frac{1}{418} )[/tex]

[tex]ln(0.0184)=\frac{\Delta H_{vap}}{8.3145} (\frac{141}{233662} )[/tex]

[tex]\Delta H_{vap}=\frac{-3.9954*1942782.7}{-141}[/tex]

[tex]\Delta H_{vap}=55051.02[/tex]

[tex]\Delta H_{vap}=55051.02[/tex]

[tex]\Delta H_{vap}=55.1[/tex] kJ/mol

Using those values, molar enthalpy is 55.1 kJ/mol

Comparing to the CRC Handbook, which is [tex]\Delta H_{vap}=71[/tex] kJ/mol:

[tex]\frac{55.1}{71}[/tex] = 0.78

The calculated value is 0.78 times less than the CRC Handbook.

Answer:

4

Explanation:

there is a decimal place present. so you would take away any zeros before the number.

Answer:

4 i think

Explanation:

Lead 214 emits then beta electrons to transform into bismuth 214 and polonium 214, which produces lead 210 through the emission of a third alpha particle. This series of transformations take place in a time span roughly equal to an hour.

Hope this helps, if I am right, brainliest? :))))

Answer:

The answer is

Explanation:

In order to calculate the volume needed we use the formula

[tex]V_2 = \frac{C_1V_1}{C_2} [/tex]

where

C1 is the concentration of the stock solution

V1 is the volume of the stock solution

C2 is the concentration of the diluted solution

V2 is the volume of thevdiluted solution

From the question

C1 = 1.45 M

V1 = 25 mL

C2 = 0.0245 M

So we have

[tex]V_2 = \frac{1.45 \times 25}{0.0245} = \frac{36.25}{0.0245} \\ = 1479.59...[/tex]

We have the final answer as

Hope this helps you

Answer: To evaluate the claim in the advertisement, Travis should look at the data for the control group to see how much the fish grew without the new food.

Explanation:

Answer:

It will melt everything and if lava goes into water it will become rock.

Hope this helped you!

Explanation:

Answer:

Explanation:

the formula of the compound containing sodium and oxide ion is

NaOH the charge on sodium is partial positive and the charge on hydroxide ion is partial negative

another compound containing sodium and oxide ion is Na2O here the charge on sodium oxide is neutral

Answer:Boiling water is a physical change, as it rearranges molecules but does not affect the internal structures. Boiling water forces the water molecules away from each other as the liquid changes to vapor. In a chemical change, new chemical substances are created or formed. Advertisement. Physical changes affect the state of an item, and a chemical change happens at a molecular level.

Explanation:

hope it helps:))

Answer:

gragsgv

Explanation:

cwnbcsjhbvcd

most reactive among them is fluorine because it is the most electronegative element

Answer:

fluorine (F)

Explanation:

I took the test on edge