A small coil of magnesium ribbon is placed in a crucible. The crucible and cover have a mass of 21.35 grams. Measuring the mass, including the magnesium gives 21.63 grams. The crucible, cove and contents are heated and then cooled and treated with water, A second heating and measuring of the final product (magnesium combined with oxygen) gives a mass of 21.82 grams. Determine the empirical formula of this oxide of magnesium.

Answer:

0.714Jg^-10C^-1.

Explanation:

According to specific heat capacity, the specific heat of graphite is -0.714 J/g°C.

Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.

It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.

It is given by the formula ,

Q=mcΔT

In the given example, it is calculated as, c=Q/mΔT

Substituting values in above equation, c= 815.1/15×(-76.1)

c=-0.714 J/g°C

Thus, the specific heat of graphite is -0.714 J/g°C.

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Answer:

Rubidium

Explanation:

Add the exponents: 2+2+6+2+6+2+10+6+1=37

Look for the atomic number 37

The element having electronic configuration 1s₂, 2s₂, 2p₆, 3s₂, 3p₆, 4s₂, 3d₁₀, 4p₆, 5s₁ is rubidium .

A chemical element is a species of atoms, including the pure substance made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.

They can be identified by their particular atomic number. The periodic table groups the elements according to their atomic number and draws attention to those with related qualities.

The most vital ingredient for life is carbon. Life as we know it would not exist without this element. You'll see that carbon is the main component of the chemicals required for life.

Thus, The element having electronic configuration 1s₂, 2s₂, 2p₆, 3s₂, 3p₆, 4s₂, 3d₁₀, 4p₆, 5s₁ is rubidium .

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Answer:

Option A, A-light bends around the edges of the slit.

Answer:

Resolution is the ability to distinguish two objects from each other. Light microscopy has limits to both its resolution and its magnification.

Answer:

Rhodium is used to make electrical contacts, as jewelry and in catalytic converters, but is most frequently used as an alloying agent in other materials, such as platinum and palladium. These alloys are used to make such things as furnace coils, electrodes for aircraft spark plugs and laboratory crucibles.

Explanation:

Answer:

Metal name (charge in roman numerals) Non metal

for example Iron (III) chloride

Explanation:

The rule for naming special transition metal are as follows -

a) First name the transition metal

b) Now write the name of the non metal in the chemical formula.

c) Write the charge for the non metal.

d) If there is a polyatomic ion, write the Common Ion Table ,its formula and charge.

e) Based on the total charge on the non-metal or polyatomic ion, deduce the total charge on the transition metal

f) Write the charge of transition metal after the name of metal in Roman Numeral in parentheses

Answer:

there are four peaks in the 13c NMR (B)

To solve this we must be knowing each and every concept related to NMR. Therefore, the correct option is option B among all the given options.

NMR spectroscopy is a form of spectroscopy that may be used to evaluate the quality or purity of such a sample as well as the molecular weight of a substance.

It really is based on the observation that now the nuclei among most atoms have spin and that all nucleus are electrically charged. NMR spectroscopy relies on the electromagnetic radiation absorption in the radiofrequency range 3kHz-300 GHz. There are four peaks in the 13C NMR  spectrum of 1,4-dimethylbenzene.

It occurs at such a wavelength that corresponds to radio frequencies, and when an electron recovers from such an excited state back ground state, it produces the same frequency radio wave.

Therefore, the correct option is option B.

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Answer: 0.5 atm

Explanation:

you would want to use Boyles law which is P1P2=P2V2

or in this case, 1.00atm x 5.00L=P2 x 10.0L

                       1.00x5.00/10.00= 0.50atm

Answer:

This is true

Explanation:

Even at the atomic level when an element is heated up, the atoms continue to move faster and continue colliding.

The opposite happens with the cooling of elements.

Answer:

Atom 1 after gaing 2 electrons have -2 charge

And atom 2 after donating 2 electrons have +2 charge

Explanation:

Answer:

GGCATTACGTA

Explanation:

Complimentary pairs are G-C and A-T

non-Metals:

Nitrogen.

Oxygen.

Helium.

Sulfur.

Chlorine.

Explanation/Answer:

Metal atoms have only a few electrons in their outer shell whereas non-metal atoms have lots of electrons in their outer shell. This means that metals tend to react with non-metals. When a metal reacts with a non-metal, electrons transfer from the metal to the non-metal.

HOPE I HELPED!!

Answer:

hydrogen is collected at negative chose and oxygen is collected at positive anode. Hydrogen is double in volume than oxygen. 2H2O = 2H2 + O2.

Explanation:

and GAMER PHROG

Answer:

Human exhale

Explanation:

When humans exhale-carbon is that which all humans produce=18% of all carbon output

Answer:

its bacteria

Explanation:

Single-celled organisms can directly take in nutrients from their outside ... Figure 1. The digestive systems of representative animals. Images from ... There are two types of animal body plans as well as two locations fordigestion to occur

Answer:

A bacteria

Explanation:

i did it LOL

Answer:

Not necessarily.

Explanation:

Answer:

1kg= 1000 grams hope it helps

Answer:

Hot magma rises from the mantle at mid-ocean ridges pushing the plates apart. Earthquakes occur along the fractures that appear as the plates move apart.:

1. Nickel (II) Bromide

2. Iron (II) Oxide

3. Iron (III) Oxide

4. Tin (IV) Chloride

5. Lead (IV) tetrachloride

6. Tin (II) Bromide

7. Chromium (III) Phosphide

8. Iron (II) Fluoride

9. Gold (III) Chloride

I hope this helps. I'm more than 100% sure that all the answers except for number 7 are correct. I knew all of them off the top of my head except for this one. I hope the other answer has the correct answer for that one. Good luck and have a great day.

Answer:

Number of representative particles of a substance can be converted to moles of that substance by multiplying it by Avogadro's number as 1 mole=6.023 ×10²³.

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

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According to the enthalpy diagram true statement is that Arrow C indicates that third intermediate reaction is exothermic in nature.

Enthalpy of the reaction gives idea about the exchange of heat during the whole chemical reaction process.

Hence Arrow C indicates that the third intermediate reaction is exothermic is true statement.

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Answer: c

Explanation:

Answer:

I already am

Explanation:

Answer:

They are both letters?

Explanation:

Answer: The water vapor, carbon dioxide, methane, and other trace gases in the earth's atmosphere absorb the longer wavelength. These are all reasons why infrared waves hit the ground.

The water vapor, carbon dioxide, methane, and other trace gases in the earth's atmosphere absorb the longer wavelength. These are all reasons why infrared waves a part of electromagnetic spectrum  hit the ground.

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.

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Molar mass:-

[tex]\\ \sf\longmapsto LiCN[/tex]

[tex]\\ \sf\longmapsto 7u+12u+14u[/tex]

[tex]\\ \sf\longmapsto 21u+12u[/tex]

[tex]\\ \sf\longmapsto 33u[/tex]

[tex]\\ \sf\longmapsto 33g/mol[/tex]

No of moles=Given Mass/Molar mass

[tex]\\ \sf\longmapsto \dfrac{83}{33}[/tex]

[tex]\\ \sf\longmapsto 2.5mol[/tex]

Answer:

trigonal planar geometry

Explanation:

The molecule, formaldehyde , has three regions of electron density around the molecule. The carbon atom is the central atom in the molecule of formaldehyde.

Recall that each bond around the central carbon atom in formaldehyde- both single and double are counted as a single region of electron density. Molecules having three regions of electron density around the central atom have a trigonal planar geometry.

Answer: Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction.

Explanation: