A(n) _____________ is a mixture of fuel and oxygen for which the masses of these two components are exactly those needed for complete combustion, with no residue.

If the energy of the photon of light emitted from a hydrogen atom has a magnitude of 4.084 x 10-19 j, and the electron starts at level n = 4 then  final state of the electron is n=2

Here given data is energy of the photon of light emitted from a hydrogen atom has a magnitude of 4.084 x 10-19 j and electron starts at level n = 4 then from ground state to excited state n=2 final state are seen from given data  energy of the photon = E= -2.18×10⁻¹⁸J (1/nf²-1/ni²) using this formula ans is to be 0.235 and this energy is n=2 are seen thats why final state of electron are seen in n=2

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It is true that metallic bonds are responsible for many properties of metals such as conductivity.

Metallic bond is a type of chemical bond.

Metallic bond is formed between electrons and positively charged metal ions.

Substances with metallic bond conduct an electric current in liquid and solid state, because they have mobile electrons.

Most metals (for example sodium, calcium, iron, silver) have strong metallic bond, because strong electrostatic attractive force between valence electrons (metals usually have low ionization energy and lose electrons easy) and positively charged metal ions.

Metallic bond increace electrical and thermal conductivity.

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Answer:

34.4

Explanation:

You would divide the mg by 1000 to get the number of grams.

Answer:

If there are 13 protons (positive charges), how many electrons are there in a neutral atom? Expert Answer 1)) given total number of protons =13 and electron =12 . For atom to be neutral total number of protons should be equal to total number of electrons.

Explanation:

The can be said about the mass of the 1M HCl and 1 M NaOH after they were combined

The combined mass of the 1 M HCl and 1 M NaOH was the sum of their respective masses.

So, hydrochloric acid reacts with sodium hydroxide approach to form sodium chloride and water. This response can be represented as: Hydrochloric acid + Sodium hydroxide → Sodium chloride + Water.

The mass of the 1.0 M HCl and 1.0 M NaOH solutions after they were combined is 76.5g.

HCl  +  NaOH ⇄ NaCl + H₂O

1 mole of HCl produces 1 mole of NaCl

36.5g of HCl produces= 58.5g of NaCl

36.5g of HCl produces= 18g of H₂O

Total mass after combining = 58.5g + 18g = 76.5g

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The density of the iron, given the data from the question is 7.85 g/mL

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

The following data were obtained from the question:

The density of the iron can be obtained as follow:

Density = mass / volume

Density of iron = 15 / 1.91

Density of iron = 7.85 g/mL

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When we double the quantities of reactants and products in a reaction,  the value of the equilibrium constant remains the same.

K = [P]/[R]

where,

[P]  is the concentration of the product.

[R] is the concentration of reactant.

If we double the quantities of reactants and products in the final concentration it'll become

[R]2=2×[R]1 and [P]2=2×[P]1

Now at initial stage

K1 =  [P1]/[R1]

at final stage after doubling the products

K2=[P2]/[R2]

Putting the given values

K2/K1 = 2×[P1]×[R1]/2×[R1]×[P1]

K2/K1=2/2

K2/K1=1

K2=K1

So, the value of equilibrium constant remains same.

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Bam's solution, 5.42 g of CsCl mixed with 35.31 ml of H2O, has a concentration of 15.3882 g CsCl/100 g H2O.

Concentration, in chemistry, is defined as the amount of solute in a particular amount of solvent or solution. Some of the most common ways to express concentration includes molarity, mass-to-mass and mass-to-volume.

To solve for the concentration of Bam's solution in g solute/100 g solvent, solve for the mass of the solvent first.

To solve for the mass of the solvent, use the density and volume:

mass solvent = density x volume

mass solvent = 0.9975 g/ml x 35.31 ml

mass solvent = 35.221725 g

Solving for the concentration of Bam's solution in g solute/100 g solvent, where the mass of the solute CsCl is 5.42 g:

concentration = mass solute/ 100 g solvent

concentration = 5.42 g/ (35.221725/100)

concentration = 15.38822985

concentration = 15.3882 g CsCl/100 g H2O

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The mass of NaCl produced is 0.117 g.

The pH of a solution is what tells us if the solution is acidic or basic. The solution is acidic if the pH of the solution is less than 7.

1) pH = - log(3.5 x 10^-5 M)

= 4.45

Thus the solution is acidic.

2) We can see that the concentration as given is the concentration of OH^-

[OH ] = 4.0 x 10^-3 M

pOH = -log (4.0 x 10^-3 M)

pOH = 2.39

pH = 14 -  2.39

pH = 11.61

The equation of the reaction is; [tex]NaOH + HCl ----- > NaCl + H2O[/tex]

Number of moles of NaOH =  0.40 M * 10/1000 = 0.004 moles

Number of moles of HCl = 0.20 M  * 10/1000 = 0.002 moles

We can see that HCl is the limiting reactant

Mass of NaCl produced ;

0.002 moles * 58.5 g/mol = 0.117 g

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If you have 9 moles of CaCl₂ and all the  Na₃PO₄i needed 18 moles of NaCl

In the chemical reaction here

CaCl₂ +  Na₃PO₄ → Ca₃(PO₄)₂ + NaCl if we balance this chemical reaction then

3CaCl₂ +  2Na₃PO₄ → Ca₃(PO₄)₂ + 6NaCl then Ca=1×3=3

,Cl=2×3=6,

Na=3,PO₄=1,

all this are in reactant Ca=3, Cl=1, Na=1, PO₄=2 all this are in product so NaCl produce 18 moles.

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You are given the sodium acetate, hcl (1 m), nahco3, and nahco3 we need na2co3

Here pKa Co=310.3⁴  buffer of pH =9.9

Use nahco3, and na2co3 to prepare 100mL of buffer with 0.1M of concentration here we calculate the given salt,

pH=pKa+log[salt]/[acid]  9.9=10.1+log[na2co3]/[nahco3][na2co3]/[nahco3] = 0.63

[na2co3]+[nahco3]=0.1M

0,63[nahco3]+[nahco3]=0.1 [nahco3]=0.0613M

Moles=molarity×volume=0,0613×100/1000=0.0613moles

[na2co3]=0.1-0.0613=0.938M

Moles=0.938M

Calculated moles will be prepared in buffer in 100 ml solution

Moles=mass/molecular weight

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Answer:

Explanation:

Magnetic field is the magnetism charge around a magnetic body

The binder found in high-fiber foods that inhibits the absorption of iron and zinc is oxalic acid Choose raw fruits and vegetables instead of juice, and consume the peels. Alternative fiber sources include whole buckwheat, whole wheat couscous, quinoa, bulgur, wheat germ, chia water seeds, hemp seeds, lentil pasta, and edamame pasta.

Popcorn is a complete grain. Serve it low-fat and without butter for a healthy snack option. It is a white crystalline substance that dissolves colorlessly in water. It got its name from the fact that early researchers obtained oxalic acid from blooming plants of the genus Oxalis, sometimes known as wood-sorrels.

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Covalent bonds predicted from an atom of Silicon (Si) are Four covalent bonds.

Covalent bonds are generally formed by the non-metals. These bonds are formed when electrons are shared between the atoms. To know the number of covalent bonds in any atom, you must know the number of valence electrons.

Those elements which belong to the period 2 forms covalent bond as-

                                  8 - number of valence electrons.

Those elements which are from period 3, they form covalent bonds exactly same as the number of valence electrons.This is because d-orbitals are present in the period.

Silicon is the 14th element which belong to period 3. The electronic configuration of 1s² 2s² 2p⁶ 3s² 3p²

Just like Carbon (C), Silicon (Si) is tetravalent in nature, which means that it can easily share all four of its valence electrons and form covalent bonds. To become stable, Silicon(Si) will form four covalent bonds.

Silicon has four valence electrons, so it will form four covalent bonds.

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Mass of water is 45.2 grams.

Overall chemical equation for reaction of combustion a propane (C₃H₈):

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.

m(C₃H₈) = 53.5 g; mass of the propane

m(O₂) = 15.0 g; mass of oxygen

m(CO₂) = 23.3 g; mass of carbon dioxide

m(H₂O) = ?; mass of water

Conservation of matter states that the mass of the reactants have to be equal to the mass of the products.

m(C₃H₈) + m(O₂) = m(CO₂) + m(H₂O)

53.5 g + 15.5 g = 23.3 g + m(H₂O)

m(H₂O) = 69.0 g - 23.3 g

m(H₂O) = 45.2 g; mass of water

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3 structural isomers can be drawn to represent the chemical formula C5H12.

When two or more organic compounds have the same molecular formula but different structures, they are said to be structural isomers, also referred to as constitutional isomers. The two molecules below share the same chemical formula, however they are distinct due to variations in the methyl group's placement.

It is an alkane, C5H12. There are 2 to the power (n-4)+1 isomers of an alkane, where n is the number of carbon atoms. Therefore, there are three structural isomers that might exist for C5H12 using the formula. They are methyl butane, n-pentane, and isopentane (dimethyl propane).

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The empirical formula of the metal iodide is Cr2I.

Mass of Chromium = 23.98

Molar Mass of Chromium = 51.9961

= 0.461 mol

Molar Mass of iodide = 126.9

= 199.6-23.88/126 = 1.394

The ratio between

Chromium and iodinei is1:2.So, the empirical formula is therefore Cr2I

Empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound.[1] A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the empirical formula of disulfur dioxide, S2O2. Thus, sulfur monoxide and disulfur dioxide, both compounds of sulfur and oxygen, have the same empirical formula. However, their molecular formulas, which express the number of atoms in each molecule of a chemical compound, are not the same.

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Sparrows with average-sized wings survive severe storms better than those with longer or shorter wings illustrates Stabilizing selection.

Stabilizing selection is a natural selection in which stabilized traits are selected rather than any extreme traits by the nature. Nature do not favors any drastic change in the traits over the years.

Stabilizing selection is often confused with or misunderstood as negative or purifying selection.

Stabilizing selection favors intermediate variants promoting survival of the species.

Average phenotype is selected and continuously dominates in coming generations.

This natural selection helps species to adapt stable phenotype for better survival rate.

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The chemical formulas and groups of the given minerals are as follow:

Quartz : Sio2 (Silicate)

Calcite : CaCO3 (Carbonate)

Pyrite : FeS2 (Sulfide)

Gold : Au (Native Elements)

Copper : Cu (Native Elements)

A piece of quartz can scratch a sample of calcite, however calcite can't scratch quartz. If you have a sample if each, attempt to scratch one sample with the other to look at the distinction in the hardness. You also can take a look at the hardness of these two minerals using a pocketknife.

Quartz is the second most abundant mineral in Earth's crust after feldspar. It occurs in nearly all acid igneous, metamorphic, and sedimentary rocks. It is an essential mineral in such silica-rich felsic rocks as granites, granodiorites, and rhyolites.

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The reaction of benzaldehyde with acetone and sodium hydroxide produces DibenzalacetoneThis is an example of an aldol condensation reaction.

A physical reaction is a reaction in which a change in the physical properties of matter or substances occurs. Physical properties include density, mass, and volume. The definition of a physical reaction is a reaction in which molecules undergo molecular rearrangements but do not change chemically.

A response, although technically a reaction, takes into account the desired outcome of the interaction. Reactions can produce positive or negative results, but reactions are designed to produce positive or negative results. To react is emotional, to react is emotional intelligence.

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The molar mass of anthroquinone is 208g/mol. The empirical formula of anthraquinone is C₇H4O₁. And the molecular formula of anthraquinone is C₁₄H₈O₂

The empirical formula is only a ratio of the moles of the various chemicals expressed in whole numbers. They are the elements that make up the compound.

The total number of atoms of an element in a compound is indicated by the molecular formula. It is the total atoms.

Thus, the mpirical formula of anthraquinone is C₇H4O₁. And the molecular formula of anthraquinone is C₁₄H₈O₂.

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The pH of the solution after dilution is 1.125.

HCl is hydrochloric acid. It is known by the name muriatic acid. It is among the strong acids. It has a pungent smell and is colorless. It has a molar mass of 36.4 g/mol. It's a common reagent used in pharmaceutical industries. It is also used in other industries such as textile, rubber, and metal.

The volume of HCl added to the solution = 3.0 ml

The molar concentration of HCl = 2.5 M

Let the molar concentration of the solution after dilution is x.

The volume of the diluted solution = 100 ml.

The molar concentration of the solution after dilution is,

[tex]M _{1} V _{2} = M_{2} V _{2} [/tex]

[tex]M_{2} = \frac{ M _{1} V _{2}}{V _{2} }[/tex]

[tex]M_{2} = \frac{2.5 \times 3}{100} [/tex]

[tex] = 0.075 \: M[/tex]

Thus, the molar concentration of the solution after dilution is 0.075 M.

The pH of the solution after the dilution is,

[tex][HCl] = [H ^{ + } ] = 0.075 \: M[/tex]

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

[tex]pH = - log(0.075)[/tex]

[tex]pH = 1.125[/tex]

Therefore, the pH of the solution after dilution is 1.125.

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The ph scale is based on the number of hydroxyls in the solution.

What are hydroxyls?

Chemistry and biochemistry both use the hydroxy group extensively. The chemical product generated on the largest industrial scale, sulfuric acid, among many other inorganic substances, contains hydroxy groups.

In the dehydration events that form lengthy chains out of simple biological molecules, hydroxy groups take part. A fatty acid's carboxy terminus loses its OH group when it is joined to glycerol to create a triacylglycerol. The carboxy group at the aldehyde end of one sugar loses its OH group when two aldehyde sugars are joined to create a disaccharide. The carboxy group of one amino acid loses the OH when a peptide bond is formed to join two amino acids to form a protein.

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Answer:

Explanation:

b. 3 sig figs

c. 3 sig figs

d. 2 sig fig

e. 4 sig fig

f. 4 sig fig

g. 4 sig fig

h. 2 sig fig

i. 5sig fig

Technique that are used to measure the freezing point of a solution is the osmometer it uses the solution's freezing point depression to put up its brawn. It is used to manage the level of osmotically felicitous body fluid in a lot of chemicals mixed in the blood operate the relationship which a mole of mixed substance lessen the freezing point of water(H2O) by 1.86 °C (35.35 °F).

The Rast method is also there.

Beckmann thermometer

When added to ice, salt first bring to an end in the film of liquid water that is always near by on the surface, thereby clouded its freezing point below the ices temperature. Ice in contiguity with salty water therefore melts, produce more liquid water, which mixed more salt, thereby lead to more ice to melt, and so on.

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The atomic number of oxygen is 8. The mass number of an oxygen atom with 7 neutrons is 15.

Atomic mass is the average mass of the atom. It is measured in atomic mass units, that is Dalton. The mass number is calculated by the number of neutrons and atomic number.

The atomic number is the number of protons present in the atoms. The atomic number of oxygen is 8

The mass number can be calculated by adding those units

atomic number + number of neutrons

Mass number = 8 + 7 = 15

Thus, the mass number of an oxygen atom with 7 neutrons is 15.

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Answer:

Which problem ??

Explanation:

Can you write your problem ??

The compound with the most exothermic lattice energy in each of the following pairs of ionic substances is Ca3N2.

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Answer:

average speed = 32

Explanation:

the formula is speed = distance / time

so s = d / t

s = 16 m / 0.5 s

s = 32 meter per second

The immediate effect of hyperventilation on the CO₂ concentration in the blood is low levels of carbon dioxide in the blood.

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