Balance the following chemical equation. Choose the correct coefficients in the balanced equation in order. *
4, 3, 2
2, 4, 2
1, 1, 1
3, 2, 3

Answer:

los metales alcalinotérreos: berilio (Be), magnesio (Mg), calcio (Ca), estroncio (Sr), bario (Ba) y radio (Ra).

o simplemente llamado grupo 2A

Explanation:

Answer: (A) a cobalt atom contains 27 protons, and most cobalt atoms contain 32 neutrons.

Explanation: just answered the question and that was the correct answer

Answer:     The answer is :     A cobalt atom contains 27 protons and MOST  neutral cobalt atoms contain 32 electrons

Explanation:   I took the test

it is held every 4-5 years

Answer:

they are all planets

Explanation:

Answer:

its a

Explanation:

a

Answer:

When the ambulance is coming towardss you the waves are smushed together and sound higher pitched but then it passes you and when tracveling away the waves are scretched out so the whee whoo sounds lower and that is because of the doppler effect

Answer:

Deci trebuie sa te aplici cu 2 din3 pe suprafata pamanyului chinez

Explanation:

Deci 1287+2086+2762+7:5

A blue light is shined on objects X and Y. Object X appears to be blue, and object Y appears to be black when Object X reflects blue light, and object Y absorbs blue light. Hence option B is correct.

Visible light spectrum is nothing but the range of wavelength of radiation from 4000 angstrom to 7000 angstrom(Violet to Red). light is a energy packet. Every Photon having different wavelength travels with same velocity c (velocity of light). When we focus numbers of colors from visible spectrum to a point, that point appears as a white light. hence white light is composed of numbers of Colors in it.

When we pass white light through a prism, as white light enters in the prism all the colors having different wavelength travels with different velocity in the prism due to that there is separation of colors from the white light. Therefore we get different colors of white light in the prism this phenomenon is know as dispersion of light.

Light can be reflected, absorbed, transmitted diffracted and scattered etc.

α + β + ν = 1 where α, β, ν are coefficient of absorption, reflection and transmission.

When any object appears to be black it means that radiation has been absorbed by that body, it has high absorption coefficient. and when a body appears to be colored, it means that object has reflected the particular color, it having high reflection coefficient.

Hence option B is correct.

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Answer:

3,2,3,4

Explanation:

try this answer, it's syits best to the question

Answer:

Alkynes are saturated hydrocarbons

Explanation:

Alkynes are groups of hydrocarbons that have the general formula of {Cn H2n - 2}. They have a triple carbon to carbon bond (C≡C) in their structure. Ethyne (HC≡CH) is the first member of the alkyne series.

Alkynes like alkenes are unsaturated hydrocarbons because of their triple and double carbon bonds respectively. Unsaturated hydrocarbons do not have a complete hydrogen atom in their structural composition. Hence, the statement that "Alkynes are saturated hydrocarbons" is FALSE.

Answer:

If a substance can be dissolved it is called soluble.

if a substance cannot be dissolved it is called insoluble

Answer:

I think it's

there are the same number of molecules on each side of the equation, then a change of pressure makes no difference to the position of equilibrium

Answer:

338.38 K

Explanation:

Applying,

PV = nRT............... Equation 1

Where P = pressure, V = Volume, R = Temperature, n = number of moles, T = temperature.

Make T the subject of the equation,

T = PV/nR............. Equation 2

From the question,

Given: P = 1.95 atm, V = 12.3 L, n = 0.854 moles

Constant: R = 0.083 L.atm/K.mol

Substitute these values into equation 2

T = (1.95×12.3)/(0.854×0.083)

T = 338.38 K

Answer:

0.113 liters

Explanation:

5.41 M / 47.71 moles = 0.113 liters

Answer:

[tex]p_2=2.655kPa[/tex]

Explanation:

Hello there!

In this case, according to the Dalton's law, which states that the total pressure is equal the sum of the pressures of the gases in the mixture, we write the following for this system:

[tex]P_T=p_1+p_2[/tex]

Thus, we solve for the partial pressure of the gas #2 as shown below:

[tex]p_2=P_T-p_1\\\\p_2=5kPa-2.345kPa\\\\p_2=2.655kPa[/tex]

Best regards!

Answer:

iodine

Explanation:

Answer:

I would say the purple one!

Explanation:

Answer:

The period number on the Periodic table tells you the total number of orbits that the atom will have. In other words, the period number indicates the number of energy levels (or energy orbit) of an atom. For example, 1st period indicates that these elements possess 1 energy shell (or energy orbit).

Explanation:

Explanation:

4.5×6.022×10²³

27.099×10²³

According to Avogadro's number, there are 27.10×10²³ atoms in  4.5 moles of Al.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.As 1 mole =6.023×10²³ atoms , thus,4.5 moles =4.5×6.023×10²³ = 27.10×10²³  atoms.

Thus, there are 27.10×10²³ atoms in  4.5 moles of Al.

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Answer:

Because Sulphuric acid(H2SO4) is one of the substance which have a very high vigourous reaction if mix with chemicals thats why we take the same sulphuric acid but having lighter effects known to be as Dil.Sulphuric And so it is generally use for precaution while during experimentations Thats why we use it.

Hope it helps

Answer:

B. 460 NM

Explanation:

THAT THE ANSWER

Answer:

600 mL

Explanation:

molarity 1 * volume 1 = molarity 2 * volume 2. So this means 12 * 250 = 3000 and divide that by 5 to get 600 mL.

Answer:

Synthesis Reaction

Explanation:

A synthesis reaction occurs when two or more reactants combine to form a single product. In a decomposition reaction, one reactant breaks down into two or more products. This is the reverse of a synthesis reaction. Replacement reactions occur when elements switch places in compounds.

Answer:

An atom with a neutral charge has an equal number of protons and electrons.

Explanation:

The three main subatomic particles in the atom are neutrons, protons and electrons.

Protons are positively charged particles, electrons are negatively charged particles while neutrons are not charged particles.

An atom is neutral if the number of protons and electrons are equal. This is the condition for neutrality in the atom.

The number of protons will be the same for all isotopes of Carbon.  Options A and C are correct.

What made an atom?

An atom is made up of central nucleons (positive protons and neutral neutrons) and surrounding negatively charged electrons.

In a neutral atom, the number of electrons and protons is the same because opposite charges neutralize each other.

The number of protons is the same in all isotopes of an element because changing the proton changes the identity of the element.

Therefore, the number of protons will be the same for all isotopes of Carbon.

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Answer: What is the mass of disulfur pentoxide (S2O5)?

Explanation:144.14g/mol