Express in scientific notation. Choose the answer with the proper number of significant figures.
9.10^9
4.5 x 10

Answer:

B)

Explanation:

The layers of the atmosphere are classified by changes in temperature in accordance with height.

Answer:

340.8mL

Explanation:

The following data were obtained from the question:

P1 = 740.0mmHg

V1 = 350.0mL

P2 = at stp = 760mmHg

V2 =?

Using Boyle's law equation P1V1 = P2V2, we can easily find the new volume as illustrated below:

P1V1 = P2V2

740 x 350 = 760 x V2

Divide both side by 760

V2 = (740 x 350) /760

V2 = 340.8mL

The new volume is 340.8mL

To convert the volume at a different pressure to its new volume at standard pressure, use Boyle's Law. Substituting the given values into the equation, the new volume at standard pressure is 343.42 mL.

To convert the volume at a different pressure to its new volume at standard pressure, we can use Boyle's Law. Boyle's Law states that the pressure and volume of a gas are inversely proportional at constant temperature.

We can use the equation:

P1V1 = P2V2

Where P1 and V1 represent the initial pressure and volume, and P2 and V2 represent the new pressure and volume. Rearranging the equation, we get:

V2 = (P1V1) / P2

Substituting the given values into the equation, we have:

V2 = (740.0 mmHg * 350.0 mL) / (760.0 mmHg)

V2 = 343.42 mL

Therefore, the new volume at standard pressure is 343.42 mL.

Answer:a

Explanation: duh man

Answer:

To answer your first question, when the outer layer of aluminum interacts with oxygen, it forms an aluminum oxide layer that is passive. While the outer layer corrodes, it provides a protective coating that protects the inner layer from further deterioration. As a result, aluminum corrosion is beneficial.

To answer your second question, corrosion of iron is a serious problem because almost all things in our civilization is made of iron or one of its alloys, from automobiles to homes, tools to prosthetics.

When you look back at the past of corrosion research, you'll notice that it all began with the question "why does iron rust?" The most powerful organization of corrosion engineers, NACE, crunched the numbers, and the total amount of iron (only in the United States) is in the billions!

When you consider how inexpensive iron is in comparison to other metals, you can see why it is so widely used; and when you consider all of the developments in metallurgy over the last century, you can see how scientists have worked to improve its sturdiness: new alloys with improved corrosion resistance and strength; treatments to postpone corrosion and even attempt to replace it.

Explanation:

I deeply apologize if this is a late or overdue answer. I also hope this answers your original question and if it doesn't, I deeply apologize.

Other than that, I hope this was helpful and I hope you have a pleasant evening :)

Answer:

NH3 + H2SO4 ---> ((NH4)2)SO4 + H2O

Explanation:

This is a common reaction; ammonia and sulfate make ammonium sulfate and the excess hydrogen and oxygen(not part of a polyatomic ion) get into the form of H2O

I hope this helps!

(This can commonly be confused as double replacements but hydrogen is in both reactants.)

Answer:

14.64 grams of carbon

Explanation:

The Molecular formula of Glucose is C₆H₁₂O₆.

From the molecular formula, the Molar mass of Glucose is,

Mass of Carbon in Glucose = 6*12 = 72.

Mass of Hydrogen in Glucose = 12*1 = 12.

Mass of Oxygen in Glucose = 6*16 = 96.

Molar mass of Glucose = 72+12+96 = 180 grams.

180 grams of Glucose contains 72 grams of Carbon.

How many grams of Carbon are there in 36.6 grams of Glucose.

180 --> 72

36.6 --> ?

Let it be 'x' grams

Then, by Criss Cross, (x)(180) = (36.6)(72) => x = 14.64 grams.

Therefore 14.64 grams of carbon are there in 36.6 grams in glucose.

the answer is: Ground water is water beneath the earth’s soil stored in soil pore spaces and in fractures of rock formations. :)

Answer:

The neutral atoms of the element have an oxidation number of 0. When the atoms loose their three valence electrons to form ions they then have an oxidation number of +3

Explanation:

The oxidation number of aluminum, which has 3 valence electrons, is typically +3. This represents the charge held by the atom when it loses these valence electrons in reactions, demonstrating the notion of oxidation.

The oxidation number of an atom is the charge that atom would have if the compound was entirely ionic. Aluminum, a metallic element with 3 valence electrons, typically loses these electrons in reactions, resulting in a positive oxidation number. In the case of aluminum, because it loses its three valence electrons, its oxidation number is usually +3. This means an aluminum atom, after ionizing, has lost three electrons and carries a charged of +3. The loss of electrons is represented as oxidation in chemistry.

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Explanation:

hydrogen + oxygen = water

Word equation that shows hydrogen reacting with oxygen to form water is Hydrogen + oxygen → Water

In a chemical reaction the compounds that are present in the left hand side of the reaction is reactants and those present on the right hand side are products.

Given options are-

O oxygen + water → hydrogen

O hydrogen + oxygen→ Water

O oxygen + water → hydrogen + 'water

O hydrogen + water → oxygen

Therefore, Word equation that shows hydrogen reacting with oxygen to form water is Hydrogen + oxygen → Water.

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Theoretical yield is 216.88 grams when reacting with 100.0 grams of Cl2 with excess CS2.

Explanation:

Theoretical yield is the complete conversion of a limiting reagent in product.

In the equation given

3Cl2 +  CS2 ⇒ CCl4

100 grams of Cl2 will give

number of moles = [tex]\frac{mass given}{atomic mass}[/tex]

                             = [tex]\frac{100}{70.906}[/tex]

                              = 1.41 moles

3 moles of Cl2 gives 1 mole of CCl4

1.41 moles of Cl2 will give x moles of CCl4

[tex]\frac{1}{3}[/tex] = [tex]\frac{x}{1.41}[/tex]

0.47 moles of CCl4 is formed

Theoretical yield is 0.47 x 153.82

= 216.88 grams.

 100 gram of Cl2 is the limiting reagent in the reaction which produced 216.88 grams of CCl4.

Hey there!

Molar mass of CaCl₂:

Add the molar masses of each element multiplied by the amount of that element we have.

Ca: 1 x 40.078

Cl: 2 x 35.453

---------------------

           110.98 grams

The molar mass of calcium chloride is 110.98 grams.

Hope this helps!

The molar mass of Calcium Chloride (CaCl2) is 111.0 grams per mole.

To calculate the molar mass of calcium chloride, which is represented by the formula CaCl2, you must add the molar masses of calcium (Ca) and chlorine (Cl) atoms. Calcium has a molar mass of 40.0 grams per mole, while chlorine has a molar mass of 35.5 grams per mole. Since there are two chlorine atoms in calcium chloride, you must multiply the molar mass of chlorine by 2. Therefore, the total molar mass of calcium chloride is the sum of the molar mass of calcium plus two times the molar mass of chlorine: Ca (40.0 g/mol) + 2 × Cl (35.5 g/mol) = 111.0 g/mol.

Answer:

Answer is D

Explanation:

xrays would be far more efficient at detecting objects through solids.

X-rays would be best because they are high-energy waves that can penetrate solids ( D )

X-rays have shorter wavelengths and higher frequency when compared to radio waves therefore they have higher energy which is required to penetrate solids at the Airport.

Therefore X-rays would be a better suited electromagnetic wave to be used by Airport security to see items inside a luggage.

Hence we can conclude that The type of electromagnetic wave that would be the best for airport security to use is  X-rays.

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Answer:

The importance of crystal structure. The graphite-diamond mineral pair is an extreme example of the importance of crystal structure. These two very different minerals have exactly the same chemical formula (C), but the crystal structure of the two minerals is very different. In graphite, carbon atoms are bonded together along a flat plane, as shown in Figure 3.

Explanation:

The importance of crystal structure. The graphite-diamond mineral pair is an extreme example of the importance of crystal structure. These two very different minerals have exactly the same chemical formula (C), but the crystal structure of the two minerals is very different. In graphite, carbon atoms are bonded together along a flat plane, as shown in Figure 3.

The different minerals that are formed in different environments can be used to illustrate that different environments possess unique environmental properties which are vital in making up matter.

It should be noted that life on Earth follows a cyclical nature such that the energy that is gotten from the sun is recycled back into space. Also, the terrestrial, aquatic, and arboreal environments all have different energy that circulates in the ecosystem.

Furthermore, there are several factors such as climate that helps in the formation of soil which is a required constituent in some minerals.

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265.2 mmHg is the partial pressure of oxygen in 780 mmHg of total pressure.

Explanation:

The partial pressure of a gas is defined as the individual pressure of the gas in total mixture. In an ideal gas all the constituent gases have partial pressure some of which will give total pressure of the gas.

The partial pressure of a gas is calculated by

total pressure x mole fraction of the gas.

Mole fraction of the oxygen present is 0.34 as it is 34% of the total gas.

[tex]\frac{34}{100}[/tex] = 0.34  is the mole fraction

Total pressure is given as 780 mm Hg

The partial pressure can be calculated using the above formula:

Putting the values in equation:

780 x 0.34

= 265.2 mm Hg is the partial pressure of oxygen.

Answer:

The density of the gas is 0.00125 g/cc and the gas is Air.

Explanation:

Given,

mass of gas = 1.25 grams

Volume = 1000 cc.

Density = ?

Density of the gas can be found by using the formula

Density = Mass/Volume

Substituting the values we get,

Density = 1.25/1000 = 0.00125 g/cc.

The gas is air because at room temperature and pressure air has a density of 0.00125 g/cc.

Answer:

D

Explanation:

Answ

D

Explanation:

Any ones whos job requires chemical

Answer:

Click on the picture to get full view! This is what I had on mine!

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Approximately 68.4 grams of KCI should be dissolved in 200 grams of water at 60°C to make a saturated solution.

To find the amount of KCI that must be dissolved in 200 grams of water to make a saturated solution at 60°C, we need to use the solubility data for KCI. At 60°C, the solubility of KCI in water is approximately 34.2 grams per 100 grams of water. Therefore, in 200 grams of water, the amount of KCI that needs to be dissolved would be:

(34.2 grams / 100 grams) x 200 grams = 68.4 grams

So, 68.4 grams of KCI must be dissolved in 200 grams of water to make a saturated solution at 60°C.

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Answer:

D

Explanation:

the answer is d as the law of conservation must be hold good during the equation

Answer:

Polarizing Power is the basis of Fajan's rules of covalent character generally in ionic compounds.

Charges and radius are a function of Polarizing Power, because the higher the charge is, the larger the polarizing power is for cations with the same radius. Also the smaller the radius is, the larger the polarizing power is for cations with the same charge.

Explanation:

Answer:

A

Explanation:

heat energy is transfered through a hot object touching a cold object

Final answer:

Heat energy is the transfer of energy due to a temperature difference between two systems, such as from a warm hand to a colder ice cube. This transfer occurs spontaneously and can result in the change of state of matter, like melting. Heat flows from a higher to a lower temperature and can play a role in various chemical and physical processes.

Explanation:

Energy transfer due to a temperature difference is known as heat energy. This kind of energy transfer occurs because heat is the spontaneous transfer of energy that happens when there is a difference in temperature between two systems. For instance, when an ice cube is held in your hand, the heat from your hand is transferred to the ice cube, causing it to melt.

Thermodynamically, heat energy is the energy that is transferred from one system to another that is not work. This might occur during various processes, such as when electrical energy is converted into light energy in a light bulb and some energy is lost as heat, or during cellular metabolic reactions. Additionally, matter has thermal energy due to the kinetic energy (KE) of its molecules, and temperature corresponds to the average KE of those molecules. Heat energy flows from a higher to a lower temperature, and it can be absorbed or released during chemical and physical processes.

Final answer:

Li3N, or lithium nitride, is primarily an ionic compound formed by the transfer of electrons from lithium to nitrogen, resulting in Li+ cations and N3- anions.

Explanation:

The compound Li3N (lithium nitride) is primarily considered to be ionic in nature. Lithium (Li), being in Group 1 of the periodic table, is a metal, and nitrogen (N2), being in Group 15, is a nonmetal. The electronegativity difference between them is significant, which leads to the formation of ionic bonds as lithium donates electrons to nitrogen, forming cations (Li+) and an anion (N3-). Although lithium can form polar covalent bonds due to its high charge density and the polarizing effect it has on its bonding partners, in the case of lithium nitride, the overwhelmingly dominant type of bonding is ionic.

While lithium can form more covalent type bonds in organometallic compounds, when combined with a nonmetal such as nitrogen, the result is an ionic compound. It is important to consider that while the distinction between ionic and covalent bonds is taught, in reality, there is often a continuum with many compounds exhibiting characteristics of both ionic and covalent bonding. However, based on lithium nitride's composition and attributes, it falls closer to the ionic side of the spectrum.

Answer: 3.06m/s

Explanation:

Distance covered by swimmer = 220 m

Time taken by swimmer = 72 s.

Velocity = ?

Recall that velocity is the rate of change of distance per unit time. it is measured in metres per second.

Velocity = Distance / time taken

Velocity = 220m / 72seconds

Velocity = 3.055 m/s (approximate to 3.06m/s)

Answer:

Explanation:

The reaction is:

       [tex]PCl_5(g)+heat\rightleftharpoons PCl_3(g)+Cl_2(g)[/tex]

The application of LeChatelier's principle leads to consider the heat as a reactant or a product depending on if it is on the left side or the right side.

In this reaction, the heat is on the left side, thus it must be considered a reactant.

Decreasing the temperature is equivalent to remove or consume heat. Thus, the reaction must shif to the left to compensate that reduction of heat. That is the reverse reaction shall be favored.

In conclusion, there will be a shift toward the reactants.

Answer:

Tungsten atom has 6 energy level

Explanation:

6 energy levels of tungsten atom

Energy level 1 - 2

Energy level 2 - 8

Energy level 3 - 18

Energy level 4 - 32

Energy level 5 - 12

Energy level 6 - 2

What's a tungsten atom

Is a chemical element with the symbol W and with an atomic number 74.

Answer:

100 atm

Explanation:

Answer:

Option B. 100atm

Explanation:

The following data were obtained from the question:

n = 2moles

V = 0.5L

T = 310K

R = 0.0821 L.atm/mol.K

P =?

The pressure can obtained by doing the following:

PV = nRT

P = nRT /V

P = (2 x 0.0821 x 310)/0.5

P = 100atm

Answer:

Weak bonds require more energy to form than strong bonds. is the right answer

Explanation:

The correct statement regarding the strength of chemical bonds is Weak bonds require more energy to form than strong bonds.

Chemical bonds associates atoms with molecules, ions, crystals, and other stable species that make up the familiar compounds.

When atoms come close together, their nuclei and electrons interact and tend to distribute themselves in space in such a way that the total energy is lower than in any other configuration.

There are different types of chemical bonds like; ionic bonds, covalent bonds, hydrogen bonds, etc.

Thus, the correct option is D. Weak bonds require more energy to form than strong bonds.

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Answer:

Bromine has one half filled orbital.

Explanation:

The elements of group 17 are called halogens. These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine. Halogens are very reactive these elements can not be found free in nature. Their chemical properties are resemble greatly with each other. As we move down the group in periodic table size of halogens increases that's way fluorine is smaller in size as compared to other halogens elements. Their boiling points also increases down the group which changes their physical states. i.e fluorine is gas while bromine is liquid and iodine is solid.

Electronic configuration of bromine:

₃₅Br = [Ar] 3d¹⁰ 4s² 4p⁵

As it in known that p sub-shell consist of 3 orbitals px, py, pz and each orbital can accommodate only two electrons.

In bromine there are 5 electrons in 4p it means two electrons are present in px two in py ans one in pz. So the half filled orbital is only one.

Answer:

1. relative time

2.absolute time

Explanation:

Time that is measured in definite periods such as minutes, days, and years is called

a. Relative time.

b. absolute time.

Answer: true

Explanation: matter can’t be created or destroyed, none the less

Answer:

The amount of electrons in each atom of the element

Explanation:

Answer:

The amount of electrons in each element of the atom.

Explanation:

your protons will likely go towards (2)

leaving you with

FSbF6^-2+ H2C6H4C4