state modern periodic law ?arrange the element of halogen family in the increasing order of their number of Shell ?what type of Bond formation exists between the element of group 1 and 17 and why?​

Answer:

1.The law does not hold true if the different isotopes of the element are involved in making chemical compound.

2.The law is not applicable when elements combine in the same ratio but different compounds are formed.

Answer:

Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.

Answer:

12.3

Explanation:

Trust

Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore, 12.3L is the volume of a balloon that contains a 1.00 mol sample of oxygen with a pressure of 2.00 atm at 300.0 K.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature. There is no force of attraction between the particles.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of oxygen gas= 2.00 atm

V= volume of oxygen gas =?

n =number of moles of oxygen gas=1.00 mol

T =temperature of oxygen gas =300.0 K

R = Gas constant = 0.0821 L.atm/K.mol

Substituting all the given values, we get

2.00×V=1× 0.0821×300.0

On calculation we get

Volume=12.3L

Therefore, the volume of oxygen is 12.3L.

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The volume did not change, it remained at 20 ml

Given

20 ml a sample gas at STP(273 K, 1 atm)

T₂=546 K

P₂=2 atm

Required

The volume

Solution

Combined gas Law :

[tex]\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}[/tex]

Input the value :

[tex]\tt \dfrac{1\times 20}{273}=\dfrac{2\times V_2}{546}\\\\V_2=\dfrac{1\times 20\times 546}{273\times 2}\\\\V_2=20~ml[/tex]

The volume does not change because the pressure and temperature are increased by the same ratio as the initial conditions (to 2x)

Answer:

Gold is a relatively dense metal because its atoms have more

protons than atoms of many other metals.

Explanation:

Answer:

Subtract the number of electrons from the number of protons in an atom as a basic way of calculating the charge of the ion.

Explanation:

For example, if a sodium atom loses one electron, work out 11 - 10 = 1.

Answer:

Ground state means when n = 1

and here the electronic configuration is 2:8:2

The reactants react with oxygen and there is energy formed.

Answer:

Mass of CO₂ produced = 299.64 g  

Explanation:

Given data:

Mass of CO₂ produced = ?

Mass of propane (C₃H₈) = 100.0 g

Solution:

Chemical equation:

C₃H₈ + 5O₂     →        3CO₂ + 4H₂O

Number of moles of propane:

Number of moles = mass/molar mass

Number of moles = 100.0 g/  44.1 g/mol

Number of moles = 2.27 mol

Now we will compare the moles of propane and carbon dioxide.

                 C₃H₈          :          CO₂

                    1              :            3

                  2.27          :           3/1×2.27  = 6.81 mol

Mass of CO₂:

Mass = number of moles × molar mass

Mass = 6.81 mol × 44 g/mol

Mass = 299.64 g  

Answer:

Question 4 is 291.0346

Explanation:

Melting ice cubes. Melting solid salts. Evaporating liquid water

Answer:

ham nahi jante hai be happy

Answer:

B.

Explanation:

Answer:

The relative velocity is the velocity of an object or observer B in the rest frame of another object or observer A.

Answer:

Relative motion is defined as the calculation of the motion of an object with regard to some other moving or static object. Thus, the motion is not calculated with reference to the earth, but is the velocity of the object in reference to the other moving object as if it were in a static state.

Explanation:

Answer:

9.79740949850 moles

Explanation:

Side Note: Please let me know if you need any clarifications about this!

Answer:

im pretty sure the answer to your question is false sorry if its wrong.

Explanation:

Explanation:

charge = proton - electron

charge = 65-63

charge = +2

Answer:here is ur answer....

Explanation:

C) 2+

Water boils when the vapour pressure is least the atmospheric pressure.

The atmospheric pressure is equal at the top of the mountain.

The air around you has weight, and it presses against everything it touches. That pressure is called atmospheric pressure, or air pressure. It is the force exerted on a surface by the air above it as gravity pulls it to Earth.

As we go up in altitude the air pressure becomes less. When the pressure decreases, it takes less energy to get the water molecules to escape the surface. So the temperature is less than it would be at sea level.

Air pressure is higher or greater at the bottom of a mountain. This is because the height of the air above that level is thicker than at the top.

Pressure is given by the equation, P=rho*g*h, where rho is the air density, g is the gravity value and h is the thickness of the air layer on top of the level where we are considering the pressure.

Therefore, as we can see, at the bottom of the mountain, the thickness h of air is greater, and so is the pressure.

Hence, water boils when the vapour pressure is least the atmospheric pressure and the atmospheric pressure is equal at the top of the mountain.

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Answer:

C!!!!!!!!!!!!!!!!!!!!

Explanation:

Hope this helps!!!!!!!!!

I'm pretty sure it's a series circuit because all components are connected end-to-end, forming a single path for current flow.

Answer:

It's true

Explanation:

Uhhh, the internet! lol.

Answer:

Explanation: Because the order of elements is based on atomic number, vertical families share similar chemical properties.

Answer:

Possibly a bad reaction as some people's immune systems are weaker than others

Explanation:

Answer:

After the water has evaporated, the white crystals in the beaker have a mass of 20.0g.

The pieces of experimental evidence would best help the student to confirm that a new compound had not been made and that only a physical change occurred is of 20.0 g of white KCl crystals.

Physical changes are defined as a modification to a sample of material when some of the substance's attributes change but the composition of the sample remains the same. The digestion of food, combustion, osmosis, and phase transitions are just a few examples of how these changes play a crucial role in our daily lives.

Crystals are defined as a solid substance whose elements such as atoms, molecules, or ions are grouped in a highly organized microscopic structure to create an all-pervasive crystal lattice. Crystals are formed when molecules in a liquid group together to stabilize when it starts to cool and solidify.

Thus, the pieces of experimental evidence would best help the student to confirm that a new compound had not been made and that only a physical change occurred is of 20.0 g of white KCl crystals.

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Answer:

18.01528 grams.

Explanation:

Ther are 0.84 moles of [tex]H_{2}O[/tex] in 15.2 g of pure ice.

The molar mass of [tex]H_{2}O[/tex] is 18g.

To calculate the number of moles of a substance in a given mass of the sample, we divide the given mass by the molar mass of the sample,

Number of moles = given mass / molar mass

It is given that we have 15.2g of pure ice. Then the number of moles of [tex]H_{2}O[/tex] will be:

n = 15.2/18

n = 0.84 moles.

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Answer:  lone pair of electrons

Explanation: A bonding electron domain is a pair of electrons shared between two atoms and a nonbonding is a lone pair of electrons

The difference between the bonding electron domain and a nonbonding electron domain should be explained below.

A bonding electron domain refers to the region that lies between the two bonded atoms that comprise one or more pairs where the electrons should be bonded.

While on the other hand, the non-bonded electron contains on the single-atom also comprise of one pair of lone pair.

In this way, it should be differentiated.

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Answer:

6.624× 10²³ molecules      

Explanation:

Given data:

Mass of KOH = 60 g

Number of molecules = ?

Solution:

First of all we will calculate the number of moles.

Number of moles = mass/molar mass

Number of moles = 60 g/ 56.1 g/mol

Number of moles = 1.1 mol

Now number of molecules are determine by using Avogadro number.  

1 mole = 6.022 × 10²³ molecules

1.1 mol × 6.022 × 10²³ molecules / 1mol

6.624× 10²³ molecules        

Avogadro number:

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

Answer: I believe -3

Explanation:

Anser:

Explanation:

hope this helps

Answer:

Halogens i think. hope this help

Explanation:

Answer:

I NEED TO KNOW THIS TOO

Explanation:

IVE BEEN LOOKING FOR THE ANSWER

Answer:

B. chemical

Explanation:

Chemical change cannot go back to its original form

Answer:

B

Explanation:

bubbles is a form of chemical change :)