what pairs would form covalent bonds?

The empirical formula for the hydrocarbon is CH₂O.

First, we assume that we have 100g of formaldehyde

According to the question we have 40.0% of carbon, 6.70% of hydrogen, and 53.3% of oxygen. With help of this, we calculate the moles of individual elements.

Moles of C = 40.0 g of C × 1 mol of C / 12.01 g C = 3.331 mol C

Moles of H = 6.7 g of H × 1 mol of H / 1.008 g H = 6.65 mol H

Moles of O = 53.3 g of O × 1 mol of O / 16.00 g O = 3.331 mol O

To get the molar ratio we divide all the moles by the smallest moles which are 3.331. From here the ratio comes out to be C: H: O = 1:2:1.

Thus the empirical formula is, CH₂O.

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The melting point of a solution that is formed when 130 g of ethylene glycol (C2H6O2) dissolved in 1.00 kg of water is -6.518C.

What is melting point?

Melting point is the temperature at which substance changes state from solid to liquid. Different solids have different melting points. This depends on the pressure which is usually taken as standard pressure that is 1 atmosphere or 100kPa.

The melting point for the given solution can be calculated as,

Number moles of ethylene glycol is calculated as,

n = m / M = 130 g / 62 gmol^-1 = 2.096 mol.

m is mass, M is molecular mass.

Then the molality of the solution is calculated,

Molality = n / mass of solvent in Kg = 2.096 mol / 1 kg = 2.096 mol/kg

The Kf of ethylene glycol = -3.11

Melting point = Kf x molality = -3.11 x 2.096 = -6.518C.

Therefore, the melting point of a solution that is formed when 130 g of ethylene glycol (C2H6O2) dissolved in 1.00 kg of water is -6.518C.

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the mole fraction of the total ions in an aqueous solution prepared by dissolving 0.400 moles of caf2 in 850.0 g of water. is 0.00840 moles

The calculation of the mole fraction is as follow:

As we know that

Molar mass = Number of grams ÷ number of moles

Or

number of moles = Number of grams ÷ molar mass

from the question

Number of moles of CaI2 = 0.400

And, Molar mass of water = 18.0 g/mol

Now we can calculate  the  moles of water is

= 850.0 g ÷ 18.0 g/mol

= 47.22 mol

And, Total number of moles is

= 0.400 + 47.22

= 47.62

So, Mole fraction of CaI2 is

= 0.400 ÷ 47.62

= 0.00840 mole

hence, the mole fraction of the total ions in an aqueous solution prepared by dissolving 0.400 moles of caf2 in 850.0 g of water. is 0.00840 moles

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When using lithium-based batteries In order to enable optimal recharging, store the batteries in a fridge.

As long as there are no flaws as well as the cells are not damaged, lithium batteries are type of ethical and unlikely to malfunction. Lithium batteries may pose a fire and/or detonation risk if they are damaged or unable to function safely.

For reliable and high-power use, lithium-ion and battery packs are both appropriate. But compared to battery packs, battery packs are more effective and common. This is so that they may be used in large quantities due to their higher power levels.

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The mass of silver deposited in the electrode when a current of 3 ampere passes in 50 minutes is 6.71 g.

Electrolysis is the process of passing current through an electrolyte solution and results in the redox process where the reduced metal is deposited in the cathode.

The mass deposited w of a metal in electrolysis is can be calculated using the equation w = zit where, the z is the equivalent mass and t be the time I is the current passed.

The equivalent mass of Ag is 108 g. for one ampere the charge q will be 96500 C. Now,

w = 108 × 3 × ( 50 × 60 seconds) /96500 = 6.71 g.

Hence, the mass of silver deposited is 6.71 g.

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the concentration of lithium hydroxide in molarity was 8M

what are the properties of lithium hydroxide?

A transparent to water-white liquid with a possible strong odour is what lithium hydroxide solution looks like. Skin, eyes, and mucous membranes may have very irritating contact reactions. Through consumption, inhalation, or skin absorption, it may be harmful. Other compounds are created using it.

Given,

weight =48 g

No. of moles  =2448=2 moles

volume =250mL

Molarity Volume (in L)No. of moles=0.25L2=8M

=8M

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The new pressure will be 1.45atm.

Ideal gas equation gave a relation between pressure, temperature and volume. It can be expressed as:

PV=nRT

Where, P is pressure, V is volume and T is temperature

The given data:

[tex]T_{1}[/tex] = 280K

[tex]T_{2}[/tex]= 406K

[tex]P_{1}[/tex] = 1 atm

[tex]P_{2}[/tex] = ?

The amount of unknown pressure can be determined by using the formula:

P1/T1=P2/T2....(i)

Now, put the values of given data in above equation.

P2= P1T2/T1

P2=1×406K / 280

P2 = 1.45atm

Therefore, the new pressure will be 1.45atm

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Answer:

Chemistry Secondary School answered Mg (OH)₂ + HCl→ MgCl₂ + H₂O balance it Answer 5.0 /5 6 Diabolical Answer: The answer will be; = Mg (OH)₂ + 2 HCl → MgCl₂ + 2 H₂O That's all. Find Chemistry textbook solutions? Class 12 Class 11 Class 10 Class 9 Class 8 Class 7 Class 6 Preeti Gupta - All In One Chemistry 11 3080 solutions

The statements that best describe Bridget's recorded observations are:

1 A television is a device that converts electrical energy into heat and light energy.

2 Electrical energy may be converted into other types of energy.

3 Sound energy is created by combining heat and light energy.

4 Electrical energy may be converted into motion energy.

Energy transfer is the process of transferring energy from one system to another, such as by heat, work, or mass transfer.

Energy is required for living organisms to grow, breathe, reproduce, and move. Because energy cannot be created from a vacuum or a void, it must be transported via the biosphere. The sun is the principal source of energy for practically every ecosystem on Earth.

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Full Question:

Bridget performed an investigation to determine if a television set transformed electrical energy into other types of energy. She recorded her observations in a table. What statement best describes the results?

Question Observation

Does it transform into heat energy?

Does it transform into light energy?

Does it transform into sound energy?

Does it transform into energy of motion?

In a chemical reaction, 0. 3 moles of H2O result in the production of 0.2 moles of CO2. Chemical reactions are the means through which one group of chemical compounds are changed into another.

Chemical reactions are typically defined as changes that only affect the positions of electrons in the formation and breakage of chemical bonds between atoms, with no change to the nuclei (i.e., no change to the elements present). These types of changes are often included in the term chemical reactions.

Number of moles Definition We utilize this enormous quantity to measure atoms. Additionally, it equals the 6.022* 10 23 atoms that make up 12 grammes of carbon-12, or atoms.

C2H6 + 7/2O2 = 2CO2 + 3H2O,

where moles(CO2)=(2*0,3)/3=0.2 mol,

and n(CO2)=(2*0,3)/3=n(H2O);

n(CO2)=n(CO2)=n(H2O).

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The answer is 0.0055 grams of glucose (c6h12o6) are in 4.9 moles of glucose

The formula weight is a quantity calculated in chemistry by multiplying each element's atomic weight (measured in atomic mass units) by the number of atoms it has in the formula, and then adding up the results. Sometimes referred to as equation weights, these relative weights computed from the chemical equation. This is how isotropically weighted averages are used to get the molar mass(of glucose) (average molecular weight). This differs from molecular mass, which is the weight of a single molecule made up of distinct isotopes.

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NaCl would be the best choice to substitute in the reaction

The transfer of electrons from one reactant to another occurs during an oxidation-reduction (redox) reaction.

Numerous processes that you have already examined, such as single replacement, combustion, and combination, are redox processes. The loss of electrons is called oxidation. Gaining electrons is what reduction is. In the process, electrons are lost and gained simultaneously. For instance, when oxygen and elemental calcium react, calcium oxide is the result.

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The density of the material would be 1.75 gm/cc.

p = n'∑Ac + ∑AA/VcNA

= n'(∑Ac + ∑AA)/9³NA

=n'(∑Ac + ∑AA)/(2(rA + rX))³ NA

n' = number of atoms per unit cell

= 4(assumption)

rA = 0.137 × 10⁻⁷ cm

rX = 0.241 × 10⁻⁷ cm

NA = Avagadros number

= 6.022 × 10²³

∑Ac = Atomic weight of all cations

∑AA = Atomic weight of all anions

p = n'(∑Ac + ∑∑AA)/(2(rA + rx))³NA

= 4(22.7 + 91.4/(2(0.137 × 10⁻⁷ + 0.241 × 10⁻⁷))³ 6.022× 10²³

= 1.75 gm/cc

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Energy levels are the fixed distances of electrons from the nucleus, sublevel is a level that is lower than another level whereas an orbital is the most likely location of an electron present around an atom.

The sublevels contain carry orbitals. Orbitals are spaces that have a high prospect of containing an electron. An orbital is an area or location where the electrons are present. There can be two electrons in one orbital extreme. Each energy level or shell is divided into many sublevels. Both sublevel and subshell are used interchangeably. The sublevels are constituted by the letters s, p, d, and f. Each energy level has certain sub-levels. Therefore, these circular orbits are called as energy levels or energy shells. The orbits of an atom act for the energy levels of the electrons in it.

So we can conclude that Orbitals and sublevels are both concepts used in chemistry to describe the energy states of electrons.

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According to combined gas law:

[tex]P_{1}V_{1}/T_{1}=P_{2}V_{2}/T_{2}[/tex]

So, given [tex]P_{1}=95kpa,V_{1}=4l,P_{2}=101kpa,V_{2}=6l,T_{2}=471k[/tex]

After substituting values in the formula,

[tex]95*4/T_{1}=101*6/471[/tex]

[tex]T_{1}=295k[/tex]

What is the Combined Gas Law?

        PVT=k (k being the proportionality constant)

Thus, the original temperature is 295k.

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Answer:

Argon Gas

Explanation:

:)

Answer:

Explanation:

[He]2s²2p⁶

The correct answer is option D.

The statement that formed the basis of Dalton’s atomic theory is atoms are the smallest particles of matter and cannot be divided farther.

In 1808, Dalton presented a theory named atomic theory which suggests that atoms are the smallest particles of an element and it is impossible to divide them further.

According to his theory every element is composed of these tiny particles.

Furthermore, his theory suggests that atoms neither can be divided nor destroyed.

In a particular matter, for example gold, all atoms have similar properties while their mass varies for every single different element.

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The complete question is:

Which of these statements is one of the conclusions that formed the basis of Dalton’s atomic theory?

a. Atoms can only change into atoms of another element through nuclear reactions.

b. Atoms of gases have less mass than atoms of liquids and solids.

c. Atoms of a particular element all have the same number of protons.

d. Atoms are the smallest particles of matter and cannot be divided farther.

The correct mole ratio of the reaction is 1 mol of carbonate to 2 mol of acid. Option B

We know that the ratio of the reactants that are involved in a reaction is what we call the mole ratio. We have to note that a neutralization reaction is the type of reaction that occurs between an acid and a base. We also have to recall that is vita to be able to write the balanced reaction equation before we can be able to find the mole ratio.

Now, we have the balanced reaction equation as;[tex]CO_{3} ^2-(aq) + 2H^+(aq) ----- > H2O(l) + CO2(g)[/tex]. The reaction is thus a 1:2 reaction for the carbonate and acid.

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Answer:

Afferent or sensory neurons

Explanation:

They collect stimuli received by receptors throughout the body, including the skin, eyes, ears, nose, and tongue as well as pain and other receptors in the internal organs. Sensory information is transmitted to the central nervous system, which includes the brain and spinal cord.

There are [tex]1.77 * 10^{24}[/tex] atoms of sulfur in 60.0 g of aluminum sulfide.

How do you calculate the number of atoms in a gram?

What is the purpose of aluminum sulfide?

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Carbon Dioxide.

A presumptive test called phenolphthalein reacts with the heme molecule found in blood. Pink is produced when a reaction is favorable. While bloodstains typically have a reddish-brown hue, the color of the substrate or the stain's age can have an impact on how visible or noticeable the stain is.

A technique for separating substances or metal complexes based on their relative solubilities in two different immiscible liquids, typically water (polar) and an organic solvent, is known as liquid-liquid extraction (LLE), also known as solvent extraction and partitioning (non-polar).

Precipitin Test confirmation is required for positive results. The serologist must determine whether a stain is actually blood after a presumptive test suggests it might be blood. A precipititin test can detect proteins that are only present in human blood.

The Ouchterlony test compares the responses of a blood sample to particular antibodies to identify if it is human or animal. A sample of the unidentified bloodstain is put in an agar gel well.

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Explanation:

for reactions to occur, the reactants must've reach a certain amount of energy for collisions to occur. hence, if a reaction has a lower activation energy, this energy can be reached sooner therefore, reaction would occur faster.

Given that boron has an atomic mass of 10.81 amu, which is closer to 11 than 10, boron-11 is more common. This indicates that boron-11 is more prevalent.

The quantity of protons and neutrons in a specific element's nucleus is known as the atomic mass. This number of electrons in an object's nucleus is often indicated by its atomic number. It is an element's typical weight. The mass of the neutrons and protons can be added to determine the isotopes of an atom in an element.

The term "atomic mass" refers to the weight of a molecule or atom. To determine the average weight of elements and macromolecules as well as to resolve stoichiometry issues, the number of protons is used.

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For the necessary concentration, 500 ml distilled water must be added here.

You can consume distilled water, of course. Because it is flatter and less flavored as tap and bottled waters, you might not enjoy the taste. Businesses boil water, collect the steam, and then condense the liquid back to liquid to create distilled water. Minerals and pollutants are taken out of the water by this method.

Briefing:

Molarity= Volume /Moles​

Moles of HCl present =100×10 −3 ×3=0.3

Required molarity =0.5

∴0.5= Volume /0.3

​∴Volume=0.6 L=600 mL

Here, 600 mL total, 100 mL at the beginning

For the necessary concentration, 500 ml distilled water must be added here.

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The missing item which would complete this alpha decay reaction is: C. ²⁵³Fm₉₈.

In Science, there are three (3) main types of radioactive decay and these include the following:

An alpha decay can be defined as a type of radioactive decay in which the atomic nucleus of a radioactive element emits an alpha particle, thereby, producing chemical elements that have different atomic nucleus.

During an alpha decay, a radioactive element such as fermium (Fe) with a mass number of 257 would be decreased by four (4) while its atomic number (number of protons) of 100 is decreased by two (2), to produce an isotope and an atom of Helium (⁴He₂), as illustrated in the chemical reaction below:

²⁵⁷Fe₁₀₀  ---->   ²⁵³Fm₉₈ + ⁴He₂

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The pressure of the flask under these final conditions is 13 atm .

What are moles ?

The current SI definition of moles and the "new SI" draft definition will be reviewed. Current textbook treatments of moles are compared to these official definitions. From a historical perspective, in 1971 he reviews the treatment of moles and material quantities in textbooks before and after the introduction of these quantities in SI. Textbook definitions do not always match official definitions, but reflect common usage by chemists. This is because when the new SI is adopted, the textbook definition will likely be closer to the official definition, and the draft definition more closely matches what is found in many textbooks than the current official definition. However, SI-based quantities of substances are likely to continue to cause problems for chemistry teachers and, if retained, are largely ignored by chemistry practitioners.

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josh has 10 g of element a and 10 g or element b. when finished with the experiment, josh has 20 g of element a and b combined. This demonstrates ' Law of conservation of mass'.

In a closed system, mass cannot be created or destroyed, but it can be changed from one form to another. Thus, mass of a system remains same before and after the reaction.

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The valence electrons and oxidation number and the total no. of dot is given below.:

a) Ca -    2       0      2

b) Ca⁺² -      0    + 2     0

c) Cl             7       0     7

c) Cl⁻            8       -1    8

d) Li               1       0    1

e) Al³⁺            3     +3    0

             Valence electrons      Oxidation number     total number of dots

a) Ca                     2                                   0                                 2

b) Ca⁺²                   0                                  + 2                             0

c) Cl                        7                                   0                                 7

c) Cl⁻                      8                                    -1                                8

d) Li                        1                                      0                               1

e) Al³⁺                     3                                    +3                               0

Thus, the total number of valence electron , oxidation number and the total number of dots is given as:

a) a) Ca -    2       0      2

b) Ca⁺² -      0    + 2     0

c) Cl             7       0     7

c) Cl⁻            8       -1    8

d) Li               1       0    1

e) Al³⁺            3     +3    0

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Answer:

Electronic configuration An element's atomic number tells you the number of protons in the nucleus. The number of protons in an atom is equal to the number of electrons. In the first shell of an atom there are 2 electrons. In the third shell there are 18 electrons.