Periodic table 50 elements with thier valancies​

Answer:

Borax bead test

Explanation:

Another test that can be used to identify colored ions in a specific compound such as salt is called "Borax bead test".

This test involves use of a clear glassy bead of borax that is joined together in a wire loop which is going to be involved in chemical reaction with the salts of certain metals.

This reaction will produce colors that we can use to identify the exact metal ions that are present.

Answer:

The molarity will be "0.26 M".

Explanation:

The given values are:

Mass,

= 2.00 g

Volume of solution,

= 100 mL

or,

= [tex]\frac{100}{1000}[/tex]

= [tex]0.1 \ L[/tex]

Molar mass of KCl,

= 74.5 gm

Now,

Moles of KCl will be:

=  [tex]\frac{Given \ mass}{Molar \ mass}[/tex]

=  [tex]\frac{2}{74.5}[/tex]

=  [tex]0.026[/tex]

hence,

The molarity will be:

=  [tex]\frac{Moles \ of \ solute}{Volume \ of \ solution}[/tex]

On substituting the values, we get

=  [tex]\frac{0.026}{0.1}[/tex]

=  [tex]0.26 \ M[/tex]

Answer:

Oxidation - reduction reaction which is called redox reaction.

Explanation:

The type of reaction that is a part of another type but treated separately is called Oxidation - reduction reaction.

Thus is because they usually involve 2 separate half reactions which are oxidation reactions that involve loss of electrons and then reduction equations which involve gain of electrons.

They are treated separately for example when sodium reacts with chlorine to form sodium chloride.

2Na + Cl2 = 2NaCl

Now, sodium undergoes oxidation by loosing elctrons and it's half reaction is;

2Na → 2Na​^(+) + 2e^(-)

​​Meanwhile chlorine undergoes reduction by gaining electrons and its half reaction is;

Cl2 + 2e^(-) → 2Cl^(-)

Answer:

2HBr + Ba(OH)2 → BaBr2 + 2H2O

Explanation:

Hydrogen Bromide + Barium Hydroxide = Barium Bromide + Water

The balanced chemical equation with the correct coefficients is 2HBr + Ba(OH)₂ → BaBr₂ + 2H₂O.

First balancing the barium (Ba) atoms first. There is one barium atom on the left side and one on the right side, so no coefficients are needed for barium.

HBr + Ba(OH)₂ → BaBr₂ + H₂O

There is one hydrogen atom on the left side and two hydrogen atoms on the right side. To balance the hydrogen, place a coefficient of 2 in front of HBr:

2HBr + Ba(OH)₂ → BaBr₂ + H₂O

There are two bromine atoms on the left side and two bromine atoms on the right side, so they are already balanced.

2HBr + Ba(OH)₂ → BaBr₂ + H₂O

There is one barium atom on the left side and one barium atom on the right side, so they are already balanced.

Balance the oxygen (O) atoms. There are two oxygen atoms on the left side and only one on the right side. To balance the oxygen, place a coefficient of 2 in front of H₂O.

2HBr + Ba(OH)₂ → BaBr₂ + 2H₂O

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Answer:

c Density

Explanation:

I don'tknow if I am right if I am wrong correct me

Answer:

i dont lnow you heat alcohol over an open flame

Answer:

the ice starts melting and turns into water

From the relative atomic mass of each element, it is possible to determine each element's molar mass by multiplying the molar mass constant (1 g/mol) by the atomic weight of that particular element. The molar mass value can be used as a conversion factor to facilitate mass-to-mole and mole-to-mass conversions.

Answer:

A substances molar mass is determined by increasing its relative nuclear mass by the molar mass constanttt (1 g/mol). So the molar mass consistent can be utilized to change mass over to moles. So by duplicating a given mass by the molar mass, the measure of moles of the substance can be determined.

Explanation:

From the general nuclear mass of every component, it is feasible to decide every component's molar mass by duplicating the molar mass steady (1 g/mol) by the nuclear load of that specific element.The molar mass worth can be utilized as a change factor to work with mass-to-mole and mole-to-mass transformations.

Brainliest?

Answer:

Volume is the quantity of three-dimensional  

Explanation:

Answer:

The limiting reactant is CuSO₄.

Explanation:

The reaction is:

Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s)      (1)

To find the limiting reactant we need to find the number of moles of the reactants.

[tex] \eta_{Fe} = \frac{m}{A_{r}} [/tex]

Where:

m: is the mass of iron = 3.26 g  

[tex]A_{r}[/tex]: is the standard atomic weight of iron = 55.845 g/mol

[tex]\eta_{Fe} = \frac{3.26 g}{55.845 g/mol} = 0.058 moles [/tex]

[tex] \eta_{CuSO_{4}} = M*V [/tex]                

Where:

M: is the concentration of the CuSO₄ = 0.200 mol/dm⁻³

V: is the volume of the solution = 80.0 cm³

First, we need to convert the units of the volume to dm³ knowing that 1 dm = 10 cm and 1 L= 1 dm³.

[tex] V = 80.0 cm^{3}*\frac{1 dm^{3}}{(10 cm)^{3}} = 0.080 dm^{3} [/tex]

Now, the number of CuSO₄ moles is:

[tex] \eta_{CuSO_{4}} = M*V = 0.200 mol/dm^{3}*0.080 dm^{3} = 0.016 moles [/tex]            

So, to determine the limiting reactant we need to use the molar ratio from equation (1), Fe:CuSO₄ = 1:1

[tex]\eta_{Fe} = \frac{1 mol Fe}{1 mol CuSO_{4}}*0.016 moles \: CuSO_{4} = 0.016 moles[/tex]

Since we need 0.016 moles of Fe to react with 0.016 moles of CuSO₄ and initially we have 0.058 moles of Fe, then the limiting reactant is CuSO₄.  

Therefore, the limiting reactant is CuSO₄.  

I hope it helps you!

The limiting reactant would be CuSO4

Looking at the equation of the reaction:

Fe (s) + CuSO4 (aq) → FeSO4 (aq) + Cu (s)

The mole ratio of Fe to CuSO4 is 1:1. Thus, every 1 mole of Fe will require 1 mole of CuSO4 for reaction.

Recall that: mole = mass/molar mass

Also: mole = molarity x volume

mole of Fe = 3.26/55.8

                    = 0.058 moles

mole of CuSO4 = 0.200 x 80/1000

                            = 0.016

The mole of Fe in the reaction is more than the mole of CuSO4. Thus, CuSO4 is the limiting reactant of the reaction. Fe is in excess.

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Answer:

Option b (V1/T1 = V2/T2) is the right alternative or the new volume will be "0.048 L".

Explanation:

The given values are:

Temperature,

T₁ = 25°C

or,

   = 298.15 K

T₂ = 50°C

or,

    = 323.15 K

Volume,

V₁ = 45 mL

or,

    = 0.045 L

V₂ = ?

As we know,

⇒  [tex]\frac{V_1}{T_1} =\frac{V_2}{T_2}[/tex]

Or,

⇒  [tex]V_2=\frac{V_1\times T_2}{T_1}[/tex]

On substituting the values, we get

⇒       [tex]=\frac{0.045\times 323.15}{298.15}[/tex]

⇒       [tex]=\frac{14.541}{298.15}[/tex]

⇒       [tex]=0.048 \ L[/tex]

Answer:

Explanation: Snow forms in clouds at temperatures below freezing. As snow falls through the atmosphere, the air remains at least 32° F or colder. ... It then re-enters another pocket of cold air before reaching the surface. The snowflake refreezes and becomes an ice pellet we call sleet.

Answer:

Title.

Abstract.

Introduction.

Method.

Results and analysis.

Discussion.

Conclusion.

References.

Answer:

the brain

Explanation:

drugs mainly affect the brain to keep the addiction going

Answer:

In pituitary gland addiction causes to drugs

Mark me as brainliest

Answer:

[2 ]Na+[2 ]H2O -> [ 2] NaOH + [1]H2

Answer:

K = 250 J.

Explanation:

Hello there!

In this case, by knowing that the kinetic energy is such energy associated to the movement of an object, it is possible for us to recall the formula for its calculation in terms of mass and velocity as shown below:

[tex]K=\frac{1}{2} mv^2[/tex]

Thus, given the mass and velocity, it is possible to obtain the following kinetic energy:

[tex]K=\frac{1}{2} (5kg)(10m/s)^2\\\\K=250J[/tex]

Regards!

Answer:

557.3J is the work of expansion of the CO2 gas

Explanation:

The work of expansion of a gas under constant temperature and pressure (Isobaric pressure) is:

W = P*ΔV

Where W is work

P is pressure = 1.0atm

ΔV = Final volume - Initial Volume = 6.5L - 1.0L = 5.5L

Replacing:

W = 1.0atm*5.5L

W = 5.5atmL

In Joules (1atmL = 101.325J):

5.5atmL * (101.325J / 1atmL) =

Answer:

WHEA O IN AN EREM STATO. PETUA TOT low 6 EN 6ACY STATE ... Determine both the total number of protons and the total number of neutrons in an atom of the naturally occurring carbon isotope with the largest mass number.

Explanation:

ok

they involve tie sharing of 2 electrons pairs.

Answer:

[Cl-18]⁻ & [Cl-20]⁻

Explanation:

By definition isotopes are elements with the same number of protons by different number of neutrons. Elements X-18 & X-20 have 17 protons and represent Chlorine isotopes Cl-18 & Cl-20 each with 17 protons and 18 electrons to give the isotopes a -1 oxidation state. Both isotope of chlorine have 7 electron in its valence shell and 10 electrons in its core structure.  Gaining 1 electron fills the valence octet and establishes a -1 oxidation state.

Answer:

A - A fruit of vegetable will begin to grow

Answer:

ligma

Explanation:

Answer:

a

Explanation:

Explanation:

Sorry i cant see the mass number of Lithium.

And fyi if the N in question refers to Neutron number, the answer is as i stated.

But, if the N refers to Nucleon number the answer is proton number + mass number

Answer:

200

Explanation:

got it right on the test

Answer:

200

Explanation:

Answer:

In natural selection, organisms adapt to the environment to best suit nature's needs to survive. In selective breeding, it's as if nature were humans and the humans can choose which organisms can survive and die. They do it so they can develop organisms with desirable characteristics.

"Fog forms in a valley", a physical process called condensation occurs when a gas or vapour transforms into a liquid state.

On a chilly soda can, water gathers. As the air cools around the container, water vapor in the atmosphere reaches its dew point and condenses into liquid droplets. Condensation is the conversion of water vapor into liquid. On the outside of a chilly glass or container, water vapor condenses and turns into liquid water (sweat).

Aldol condensation, Knoevenagel condensation, Claisen condensation, and Dieckman condensation (intramolecular Claisen condensation) are a few examples of common condensations that produce alcohols as a by-product.

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Answer:

It has 1 carbon atom and 4 hydrogen atoms

Explanation:

hope this helps :)