A liquid takes 10.14 x 10^6 j of energy to boil 28.47 kg at 298 k. using the latent heats of vaporization of 5 liquids below, determine what the substance is. acetone: 538,900 j kg-1 ammonia: 1,371,000 j kg-1 propane: 356,000 j kg-1 methane: 480,600 j kg-1 ethanol: 841,000 j kg-1

Answer:

thanks

Explanation:

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Among the following salts, when added to water, will result in a solution with pH = 7.00 is (b) NaNO₃

The chemical formula for sodium nitrate is NaNO₃, and it occurs in the form of a white solid that is crystalline. It is a nitrate salt that is inorganic and of an alkaline metal. It dissolves easily in water and has applications in the manufacture of things like fertilizers, glass, and solid rocket propellant, among other things. Sodium nitrate is a powerful oxidizing agent that does not support combustion and is safe to handle.

The chemical reaction between a strong base (NaOH) and a strong acid (HNO₃) results in the formation of the salt NaNO₃. They are neutral salts. Therefore, the pH level ought to be 7.

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Answer:

kwuil is oink

Explanation:

oink=kwuil

Pik onion has oinked therefore it is kwuil.

Pik onion is kwuil so he oinked.

kwuil is oink

I hope this helps.

Answer:

kwuil is oink

Explanation:

Oinking is kwuil and kwuiling is onink

onink  =< kwuil

=kwuil + oink < zee onhions

zee onions = kwuil oniking

=kwuil is oink

You can also solve this with trigonometry.

I hope this helps

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Answer:

disagree it wont be the same momentum

Explanation:

cuh

When omitting the sodium thiosulfate solution from the kinetic trials, the resultant solution from mixing solutions A and B will appear differently than a correctly completed experiment.

Without the sodium thiosulfate, a reaction between the two solutions would not occur, so the resultant solution would be that of an unmixed combination of A and B, rather than a reaction product.

This can be confirmed by running the experiment correctly and including the sodium thiosulfate solution in the kinetic trials.

Omitting the sodium thiosulfate solution can significantly affect the appearance of the resulting solution from a kinetic experiment by not neutralizing the excess iodine and leaving unreacted iodine present in the solution.

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Answer:

C

Explanation:

The reaction between carbon dioxide and lithium hydroxide can be represented by the equation:

\(\displaystyle \text{CO$_2$} + 2\text{LiOH} \longrightarrow \text{Li$_2$CO$_3$}+ \text{H$_2$O}\)

We want to determine the amount of moles of LiOH needed to react completely with 25.5 g of CO₂.

Determine the number of moles of CO₂ in 25.5 g of CO₂:

\(\displaystyle 25.5\text{ g CO$_2$} \cdot \frac{1\text{ mol CO$_2$}}{44.01\text{ g CO$_2$}} = 0.579\text{ mol CO$_2$}\)

Use stoichiometry to determine the amount of LiOH necessary. CO₂ and LiOH are in a 1:2 ratio. That is, for every one mole of CO₂ that reacts, two moles of LiOH must also react.

\(\displaystyle 0.579\text{ mol CO$_2$} \cdot \frac{2\text{ mol LiOH}}{1\text{ mol CO$_2$}} = 1.16\text{ mol LiOH}\)

In conclusion, our answer is C.

Answer:

4.54 * 10^-14 m

Explanation:

From Heisenberg's uncertainty principle, we can write;

Δp.Δx ≥ h/4π

Given that;

Δp =Δmv

So;

Δmv.Δx ≥h/4π

Δmv =2/100(3.5×10^7 m/s * 1.66 * 10^-27)

Δmv =1.162 * 10^-21 Kgms-1

Δx ≥6.63 * 10^-34 /4 * 3.142 * 1.162 * 10^-21

Δx ≥4.54 * 10^-14 m

Answer:

The correct option is D) Humidity levels will rise

Explanation:

A rise in humidity means that it is most likely there is going to be a rain.

When blue semi-circle lines with triangles approach red semi-circle lines it is a situation where cold front is approaching a warm front.

The resultant effect is that the warm and cold air both come to a standstill. This will most likely trigger cloud and fog and may even lead to rain.

Cheers

Due to the variations in the sun-earth distance.

Explanation:

(1) they are heterogenous mixture

(2) the size of particles of colloids is too small to be seen by bare eyes.

(3) they scatter light passing through them making it's path visible.

The pH of an aqueous solution is 11.11

The pH scale, which previously stood for "potential of hydrogen," is used to describe how acidic or basic an aqueous solution is. The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.

            CN-  + H2O ↔ HCN  + OH-

initial  0.09                        0          0

change -X                        +X          +X

Equ    (0.09-X)                    X            X

so from the equilibrium equation, we can get Ka expression

when Ka = [HCN] [OH-]/[CN-]

when Ka = Kw/Kb

              = (1 x 10^-14) / (4.9 x 10^-10)

              = 2 x 10^-5

So, by substitution:

2 x 10^-5 = X^2 / (0.09 - X)

X= 0.0013

∴ [OH] = X = 0.0013

∴ POH = -㏒[OH]

           = -㏒0.0013

           = 2.886

∴ PH = 14 - POH

        = 14 - 2.886 = 11.11

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Answer:

6 Energy levels

Explanation:

First Energy Level: 2

Second Energy Level: 8

Third Energy Level: 18

Fourth Energy Level: 25

Fifth Energy Level: 8

Sixth Energy Level: 2

Hope this helps.

Electron pair repulsion is the repulsion of electron pairs in a molecule which determines the molecular geometry. This repulsion is caused by negative charges, which causes electron pairs to move away from each other. As a result, the molecular shape that allows for the maximum separation between electron pairs is the most stable.

Electron pair repulsion theory (VSEPR) is a technique used to explain how molecules take on their shapes. This theory is based on the idea that electrons repel each other, and the way they are arranged around the central atom determines the molecular shape. This theory states that the arrangement of atoms, along with the lone pairs around a central atom, is mainly determined by the electrostatic repulsion between the electrons, especially in the valence shell.In brief, electron pair repulsion is the theory that explains how electrons behave when they are in close proximity to each other. The theory, in turn, helps to explain the molecular shape that is produced when certain atoms bond together to form molecules.There are various different geometries and shapes of molecules depending on how the electrons are arranged. The molecular geometry is dependent on the position of atoms surrounding the central atom. In summary, the electron pair repulsion theory is the backbone of the VSEPR model which is useful in predicting the shapes and arrangements of molecules.

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According to the forces of attraction, heating mantles and tapes, oil baths, salt baths, sand baths, air baths, hot-tube furnaces, hot-air guns and microwave ovens, bunsen burners are used for heating liquids.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:A

Explanation:

Answer

Ultraviolet

Explanation

The types of radiation and their wavelength are:

Gamma < 10⁻¹² m

X-rays 1 nm - 1 pm

Ultraviolet 400 nm - 1 nm

Visible 750 nm - 400 nm

Near-infrared 2.5 μm - 750 nm

Infrared 25 μm - 2.5 μm

Microwaves 1 mm - 25 μm

Radio waves > 1 mm

Hence, the given wavelength of 2.86 X 10⁻⁸ m corresponds to Ultraviolet.

A person with a history of chemical dependency on controlled substances who desires to obtain A License. A license to practice Nursing students may be required to show proof of current sobriety and fitness to practice.

This rule is from the Texas Board of Nursing’s (BON) Administrative Rules. It is stated that any nurse who has a chemical dependency diagnosis or a history of controlled substance abuse must demonstrate the following through "objective, verifiable evidence" of current sobriety and fitness to practice to get a license.

This objective, verifiable evidence could be obtained through AA records, negative drug tests, an assessment by a specialist in addiction, and testimonies from group members, colleagues, and other close friends.

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Answer:

You may be saving someone from a rock slide, where the rocks will fall at any time, before they fall they have potential energy.

The one way that potential energy might be involved in rescue team missions to save someone to fall is potential energy is used to hold one.

Gravity is the interaction that is because of the force of energy between the surface of the earth to the mass or any energy present on the earth's surface and the force becomes double with the weight.

The potential energy is a form of energy that is used against gravity to do the work which required energy and in rescue, the energy is needed in every coss to save one.

Therefore, one way that potential energy might be involved in rescue team missions to save someone to fall is because gravitational potential energy is used to hold one.

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Since all species appear on both side of the ionic equation, there was no reaction.

Same ions present in both side of complete ionic equation are omitted to write net ionic equation. These ions are called the spectator ions.

first step - write down molecular equation as follows:

Al(C2H3O2)3(aq) + 3LiNO3 (aq) --> 3Li(C2H3O2)(aq) + Al(NO3)2(aq)

second step - write complete ionic equation;

Al3+ (aq) + 3(C2H3O2)^- (aq) + 3Li^+(aq) + 3N03^-(aq) -----> 3Li^+(aq) + 3(C2H3O2)^-(aq) + Al^3+(aq) + 3N03^-(aq)

You can see that all ions that appeared on the left hand side of the reaction equation also appeared on the right hand side of the reaction equation, thus thet are omitted. Hence there was no reaction.

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Approximately 7.98 grams of silver chromate will precipitate when 150 mL of 0.500 M silver nitrate is added to 100 mL of 0.400 M potassium chromate.

To determine the amount of silver chromate that will precipitate when 150 mL of 0.500 M silver nitrate is added to 100 mL of 0.400 M potassium chromate, we need to identify the limiting reagent and calculate the corresponding amount of silver chromate formed.

First, we can calculate the number of moles of silver nitrate and potassium chromate using their respective concentrations and volumes:

Moles of silver nitrate = concentration × volume = 0.500 M × 0.150 L = 0.075 mol

Moles of potassium chromate = concentration × volume = 0.400 M × 0.100 L = 0.040 mol

From the balanced chemical equation:

2 AgNO3 + K2CrO4 → Ag2CrO4 + 2 KNO3

We can see that the stoichiometric ratio between silver nitrate and silver chromate is 2:1. Therefore, the moles of silver chromate formed will be half the moles of silver nitrate used:

Moles of silver chromate formed = 0.075 mol / 2 = 0.0375 mol

Finally, we can calculate the mass of silver chromate using its molar mass:

Mass of silver chromate = moles × molar mass = 0.0375 mol × (2 × 107.87 g/mol) = 7.98 g

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The best practice recommended in the safety video for mixing an acid or a base with a solvent is to add the acid or base to the solvent.

In the safety video, it is emphasized that adding acid or base to the solvent is the safest method. This is because if the solvent is added to the acid or base, there is a higher chance of splashing or overflowing, which could lead to a dangerous situation. It is important to also stir the mixture slowly and carefully while adding the acid or base to the solvent to ensure it is fully mixed before using it.

Additionally, wearing appropriate personal protective equipment such as gloves and safety goggles is crucial when handling chemicals. By following these safety guidelines, the risk of accidents or injury can be minimized while mixing acid or base with a solvent.

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a) 25.0 mL of the compound has a mass of 17.95 g.

b) The cost of this amount of the compound is $31.43 ($1.75 x 17.95 g).

The excess reactant remains after the reaction is  1.76 g.

A limiting reagent in a chemical reaction is a reactant that is completely consumed. When that reactant is gone, the reaction will not proceed. It, therefore, limits the response to the sequel. Excess reagents are reactants that could continue to react if other reagents had not been consumed.

calculation:-

NH3 = 17 , O2 = 32 , H2O = 18

4 NH3 + 5 O2 ⇒ 4 NO + 6 H2O

68 g ⇒ 160 g ⇒ 108 g

3.25g = 3.5g (limiting reagent = O2, because 3.5/3.25 is smaller than 160/68)

68 g ⇒ 160 g

x ⇒ 3.5 g

x = 1.49 g of NH3 reacts with 3.5 g of O2

Remaining excess reagent(NH3) = 3.25–1.49 = 1.76 g

160 g  108 g of H2O

3.5 g ⇒  x

x = 2.36 g of H2O formed.

The reactant that produces less product is the limiting reagent. A reactant that produces a large amount of product is an excess reagent. To determine the amount of excess reactant remaining, subtract the mass of excess reagent consumed from the total mass of excess reagent specified. Determine which reactants are limited by dividing the number of moles of each reactant by the stoichiometric coefficient of the balanced chemical formula.

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Answer:

climate:the weather conditions prevailing in an area in general or over a long period.

2 main factors: temperature and precipitation

Explanation: