Li + HCl → H2 + Lici

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

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.

Learn more about Avogadro's number,here:

https://brainly.com/question/11907018

#SPJ2

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:

metal and nonmetal it always include

Answer: Electrovalent bonds are produced when electrons are transferred from atoms of one element to atoms of another element, producing positive and negative ions. The bond which is formed by the transfer of electrons between the atoms is called electrovalent bond or ionic bond. Electrovalent bonds are only formed between metals and non-metals. Electrovalent bonds are not formed between two non-metals.

In simple words electrovalent bond involves the transference of a certain number of electrons to another dissimilar atom which has a tendency to gain electrons so that both acquire stable inert gas configurations. The electrostatic attraction always tends to decrease the potential energy. Hence, the potential energy of the system is much less than it was before the formation of an ionic bond.

Explanation: An Ionic bond is the bond formed by the complete transfer of valence electron to attain stability.

This type of bonding leads to the formation of two oppositely charged ions – positive ion known as cations and negative ions are known as anions.

The presence of two oppositely charged ions results in a strong attractive force between them. This force is an ionic or electrovalent bond.

Ionic bonds form between atoms with large differences in electronegativity, whereas covalent bonds formed between atoms with smaller differences in electronegativity.

The compound formed by the electrostatic attraction of positive and negative ions is called an ionic compound.

Answer:

I would say the purple one!

Explanation:

Answer:

If a substance can be dissolved it is called soluble.

if a substance cannot be dissolved it is called insoluble

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.

Learn more about atom:

https://brainly.com/question/13234098

Answer:

Reflection involves a change in direction of waves when they bounce off a barrier; refraction of waves involves a change in the direction of waves as they pass from one medium to another; and diffraction involves a change in direction of waves as they pass through an opening or around a barrier in their path.

Explanation:

https://www.physicsclassroom.com/class/waves/Lesson-3/Reflection,-Refraction,-and-Diffraction#:~:text=Diffraction%20of%20Waves-,Reflection%20involves%20a%20change%20in%20direction%20of%20waves%20when%20they,a%20barrier%20in%20their%20path.

Reflection of sound wave differs from diffraction of sound wave in that a reflected sound wave bounces back to the place of origin while a diffracted sound wave changes direction as it passes through an opening.

Reflection is the bouncing back of a wave when it hits an obstacle along its path.

Diffraction is the spreading out of a wave in a circular path as it passes through a tiny opening.

Therefore, the difference between reflection and diffraction is that a reflected sound wave bounces back to the place of origin while a diffracted sound wave changes direction as it passes through an opening.

Learn more about reflection and diffraction at: https://brainly.com/question/11176463

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:

Answer: The new volume is 95.45 mL.

Explanation:

Given: [tex]V_{1}[/tex] = 45.0 mL,         [tex]P_{1}[/tex] = 0.98 atm

[tex]P_{2}[/tex] = 2.1 atm,               [tex]V_{2}[/tex] = ?

According to Boyle's law, at constant temperature the pressure of a gas is inversely proportional to its volume.

Therefore, formula used to calculate the new volume is as follows.

[tex]\frac{P_{1}}{V_{1}} = \frac{P_{2}}{V_{2}}[/tex]

Substitute the values into above formula as follows.

[tex]\frac{P_{1}}{V_{1}} = \frac{P_{2}}{V_{2}}\\\frac{0.98 atm}{45.0 mL} = \frac{2.1 atm}{V_{2}}\\V_{2} = 95.45 mL[/tex]

Thus, we can conclude that the new volume is 95.45 mL.

Answer:

(ii) 1 dye

(iii) Food coloring F is insoluble in the solvent

(iv) 'E' and 'H'

(b) Food colouring G

Explanation:

Paper chromatography principle is based on the rates of migration of chemicals across a sheet of paper which are different and it consists of a stationary phase such as the water in the paper and a mobile phase such as the solvent resulting in the partitioning of the components of the mixture across the paper

The solution components are positioned to start in one place from where they migrate and separate out on the chromatography paper

(ii) The number of components into which the food colouring 'H' separates into = 1

Therefore, the number of dyes in food colouring 'H' = 1 dye

(iii) Food coloring 'F' does not move because it is insoluble in the solvent, which is the mobile phase

(iv) The food colouring that contains the dye that is likely to be most soluble in the solvent are does for which the dyes travel furthest, which are;

Food coloring 'E' and 'H'

(b) Using a similar question solution found on 'tutor my self' website, we have;

The [tex]R_f[/tex] values are given as follows;

[tex]R_f = \dfrac{Distance \ moved \ by \ dye}{Distance \ moved \ by \ solvent}[/tex]

The distance moved by the solvent = 5 units

The distance moved by dyes in food colouring 'E' and 'H' = 4 units

The distance moved by dye in food colouring 'G' = 3.3 units

The distance moved by the second dye in food colouring 'E' = 2.7 units

By inspection, we get;

[tex]R_f[/tex] dye in food colouring 'G' = 3.3/5 = 0.66,

Therefore, the dye with [tex]R_f[/tex] value closest to 0.67 is the dye in food colouring 'G'.

Answer:

iodine

Explanation:

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

Na2SO3 – Sodium sulfite

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: (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

Answer: The statement, chemicals that you begin with found on the left side of the equation, describes reactant and where they are in a chemical equation.

Explanation:

An equation that includes symbolic formulas and represents chemical reaction between the substances initially present forming new substances is called a chemical equation.

For example, [tex]N_{2} + 3H_{2} \rightarrow 2NH_{3}[/tex]

Here, substances [tex]N_{2}[/tex] and [tex]H_{2}[/tex] are the reactants. Reactants in a chemical equation are always present on the left side as these are the chemicals we begin with.

Also here, [tex]NH_{3}[/tex] is the product. Product(s) in a chemical equation are always present on the right side as these are the chemicals we end with.

Thus, we can conclude that the statement, chemicals that you begin with found on the left side of the equation, describes reactant and where they are in a chemical equation.

Answer:

3,2,3,4

Explanation:

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

Answer:

they are all planets

Explanation:

Answer:

B. 460 NM

Explanation:

THAT THE ANSWER

Answer: Mg and O

Explanation: just took the test. Trust

Answer:

34752.6 Pa.

Explanation:

Applying,

P/T = P'/T'............... Equation 1

Where P = Initial Pressure, T = Initial Temperature, P' =  Final pressure, T' = Final temperature.

make P' the subject of the equation

P' = (PT'/T).............. Equation 2

From the question,

Given: P = 33.7 kPa = 33700 Pa, T = 98.4°C = (273+98.4) = 371.4 K, T' = (110+273) = 383 K

Substitute these values into equation 2

P' = (33700×383)/371.4

P' = 34752.6 Pa.

Answer:

Explanation:

The pH of a solution can be found by using the formula

[tex]pH = - log [ {H}^{+} ][/tex]

From the question we have

[tex]ph = - log(9.3 \times {10}^{ - 11} ) \\ = 10.0315...[/tex]

We have the final answer as

Hope this helps you