What percentage of air is oxygen ?

Hey there!:

Molar mass FeF3 = 112.84 g/mol

Number of moles  = mass of solute / molar mass

Number of moles = 24.0 / 112.84

Number of moles = 0.212 moles of FeF3

Hope that helps!

The reaction will produce C. 5 mol NH₃.  

N₂ + 3H₂ ⟶ 2NH₃

Moles of NH₃= 7.5 mol H₂ × (2 mol NH₃/3 mol H₂) = 5 mol NH₃

5 moles of ammonia, [tex]NH_3[/tex], can be made from 7.5 moles of [tex]H_2[/tex].

The mole is an SI unit used to measure the amount of any substance. The abbreviation for a mole is mol. One mole is exactly 6.02214076×[tex]10^{23}[/tex] particles.

Given data:

Moles of H₂ react = 7.5 mol

Moles of NH₃ formed =?

Chemical equation:

N₂ + 3H₂       →    2NH₃

Now we will compare the moles of ammonia with hydrogen.

            H₂              :           NH₃

             3               :             2

            7.5             :          [tex]\frac{2 X 7.5}{3}[/tex]  = 5

Hence, 5 moles of ammonia would be formed from 7.5 moles of hydrogen.

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Well if the candle lost half of its mass, and they are asking where the other half went. Most likely it is still hardened wax because the it says that you're candle lost half of its mass that means half is gone and the other half is still there. The chemical change would be liquid, and the chemical property would be Wax Vapour that is what i found.

-Hope it helps, if it does not help sorry.

B. Electrons move from metals from nonmetals creating ionic compounds.

that is called the Gulf Stream

question answered by

(jacemorris04)

Hey there!:

Number of moles =   ( number of atoms / 6.023*10²³ atoms )

given number of atoms = 5.03*10²⁴

Therefore:

Number of moles B = 5.03*10²⁴ / 6.023*10²³

Number of moles B = 8.35 moles

Hope that helps!

with his well-known gold foil experiment in which he demonstrated that the atom has a tiny and heavy nucleus.

Ernest Rutherford's most creative activity was his gold foil experiment conducted in 1909. This experiment demonstrated the structure of an atom, challenging existing models and earning Rutherford the title of 'father of nuclear physics'.

The activity that best demonstrates New Zealand physicist Ernest Rutherford's creativity is his gold foil experiment conducted in 1909. In this groundbreaking experiment, Rutherford and his colleagues bombarded a thin sheet of gold foil with a beam of high-energy alpha particles obtained from radioactive decay of radium. He then observed the subsequent velocities and trajectories of the particles, a method that led to revelations about the nuclear structure of the atom.

Rutherford's experimental design illuminated the small and dense nature of atomic nuclei. Rutherford placed a radioactive source in a lead container, producing a beam of alpha particles that struck a thin gold foil. The scattering of the alpha particles, observed by the glow they caused when they hit a phosphorescent screen, challenged existing beliefs about atomic structure. His seminal experiments with nuclear radiation and atomic structure earned him the title of "father of nuclear physics" and helped him win a Nobel Prize in Chemistry in 1908.

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1) Endothermic reactions:

a) The reaction between ammonium nitrate and water absorbs heat from the surrounding environment.

There are two types of reaction: endothermic reaction (chemical reaction that absorbs more energy than it releases) and exothermic reaction (chemical reaction that releases more energy than it absorbs).

b) Ammonium chloride dissolved in a beaker of water makes the beaker cold.

Dissolving this salt absorbs heat from beaker.

c) Water separates on hydrogen and oxygen when an electric current is run through it.

Electrolysis of water is the decomposition reaction (heat is required), because from one molecule (water) two molecules (hydrogen and oxygen) are produced. Water is separated into two molecules.

2) Exothermic reactions:

a) Three drops of concetrated sulfuric acid added to 100 milliliters in a beaker makes the beaker hot.

Energy is released, beaker absorbs that heat.

b) Uranium atoms are split to produce nuclear energy.

Nuclear energy is released.

c) Methane and oxygen are combined to produce methanol and heat.

Balanced chemical reaction: 2CH₄ + O₂ → 2CH₃OH + heat.

I think the correct answer from the choices listed above would be the last option. If a decrease in temperature accompanies a reaction, then energy was absorbed which means that the reaction is endothermic. Hope this answers the question. Have a nice day.

Answer:

It should be  endothermic reaction.

Explanation:

Because it absorbs more energy than release it.

I took the test before.  

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Chemical Reactions Learning for quiz Unit 3 Lesson 2 Physics

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You are right! That is true.

Explanation:

Elements of group 1 represented in the blue column are alkali metals.

Elements of group 2 represented in the peach column are alkaline earth metals.

Elements from scandium to zinc or all the elements represented in the green columns are transition metals.

Elements in coral pink boxes represent metalloids, that is, they show properties of both metals and non-metals.

Elements present in blue, peach, green and coral pink boxes are all metals.

Whereas elements present in pink, that is, group 18 are all noble gases.

And elements present in yellow boxes are all non-metals.

Answer is: false, carbon tetrachloride contains four single bonds.

Carbon tetrachloride or tetrachloromethane (CCl₄) is an organic nonpolar compound.

Electron configuration of carbon atom: ₆C 1s² 2s² 2p².

Electron configuration of chlorine atom: ₁₇Cl 1s² 2s² 2p⁶ 3s² 3p⁵.

Chlorine atoms have one unpaired electron, carbon atom is sp3 hybridized (has four unpaired electrons).

False, The molecule CCl4 contains only four single bonds.

Answer: The period of the FM wave [tex]1.1299\times 10^{-8} seconds[/tex].

Explanation:

Frequency of the wave = [tex]8.85\times 10^{7} Hertz[/tex]

Frequency is inverse of time period that is :

[tex]Frequency=\frac{1}{\text{Time period}}[/tex]

[tex]\text{time period}=\frac{1}{frequency}[/tex]

[tex]=\frac{1}{8.85\times 10^{7} Hertz}=0.11299\times 10^{-7} seconds=1.1299\times 10^{-8} seconds[/tex]

The period of the FM wave [tex]1.1299\times 10^{-8} seconds[/tex].

In the KLMN electronic configuration style of writing K denotes the first shell which can hold up to two electrons, L denotes the second shell which can hold up to eight (2 + 6) or 8 electrons, M denotes the third shell which can hold up to eight (2 + 6 + 10) or 18 electrons etc.

The KLMN style of writing  only indicates the number of electrons in each principal quantum number, however the spdf electronic configuration style of writing subdivides each shell into its subshells.

For instance the 3rd principal quantum number has s,p and d subshells, wherein s, p and d orbitals can have a maximum of 2, 6 and 10 electrons respectively.

Answer:- 21.4 grams of [tex]Li_3N[/tex] are formed.

Solution:- The balanced equation is:

[tex]6Li+N_2\rightarrow 2Li_3N[/tex]

From this equation, lithium and nitrogen reacts in 6:1 mol ratio. Limiting reactant gives the theoretical yield of the product. We will calculate the grams of the product for the given grams of both the reactants and see which one of them gives the limited amount of the product. This limited amount of the product will be the theoretical yield.

The molar mass of Li is 6.94 gram per mol and for [tex]N_2[/tex] It is 28.02 gram per mol. The molar mass of [tex]Li_3N[/tex] is 34.83 gram per mol. The calculations for the grams of the product for given grams of both the reactants are shown below:

[tex]12.8gLi(\frac{1molLi}{6.94gLi})(\frac{2molLi_3N}{6molLi})(\frac{34.83gLi_3N}{1molLi_3N})[/tex]

= [tex]21.4gLi_3N[/tex]

[tex]34.9gN_2(\frac{1molN_2}{28.02gN_2})(\frac{2molLi_3N}{1molN_2})(\frac{34.83gLi_3N}{1molLi_3N})[/tex]

= [tex]86.8gLi_3N[/tex]

From above calculations, Li gives least amount of the product. So, 21.4 g of [tex]Li_3N[/tex] are formed.

The theoretical yield of Li3N is 21.58 grams when 12.8 grams of Li is heated with 34.9 grams of N2. This is determined by first identifying the limiting reactant through mol calculations and then using the balanced chemical equation to calculate the theoretical yield.

To find the theoretical yield of Li3N, we first need to determine which is the limiting reactant. The balanced chemical equation is: 6Li + N2 -> 2Li3N.

From the periodic table, we find that the molar mass of Li is about 6.94 g/mol, and that of N2 is about 28.01 g/mol. Therefore, we have:

According to the balanced chemical equation, 6 moles of Li react with 1 mole of N2 to produce 2 moles of Li3N. Thus, the actual amount of Li can react with 1.85 / 6 = 0.3 mol N2, which is less than the existing amount of N2. Therefore, Li is the limiting reactant.

According to the reaction equation, 6 mol Li reacts to generate 2 mol Li3N, then 1.85 mol Li will generate 1.85 *(2 / 6) = 0.62 mol Li3N. Given that the molar mass of Li3N is about 34.83 g/mol, the theoretical yield is 0.62 * 34.83 = 21.58 g Li3N. Therefore, the theoretical yield of Li3N is 21.58 grams when 12.8 grams of Li is heated with 34.9 grams of N2.

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so one liter is about 2. something gallons so at 12.8 km/l you would get about 30 mpg which is insane but yeah

Answer: The mileage rating of the car is 30.05 miles per gallon

Explanation:

We are given:

Mileage rating = 12.8 km/L

To convert this level into milligrams per deciliters, we use the conversion factor:

1 mile = 1.61 km

1 gallon = 3.78 L

Converting the above rating into miles per gallon, we get:

[tex]\Rightarrow (\frac{12.8km}{L})\times (\frac{1mile}{1.61km})\times (\frac{3.78L}{1 gallon})\\\\\Rightarrow 30.05miles/gallon[/tex]

Hence, the mileage rating of the car is 30.05 miles per gallon

Answer:- [tex]C_4H_1_0>C_3H_8>C_2H_6>CH_4[/tex]

Explanations:- Alkanes are non polar molecules as these only have carbons and hydrogens. Electron negativity difference of C and H is very low and it makes them non polar. These have weaker London dispersion forces.

The forces of attraction becomes stronger in alkanes as the number of carbon increases because the surface area as well as molecular weight of the alkanes increases with an increase in number of carbons.

Butane has four carbons, propane has three carbons, ethane has two and methane has only one carbon, So, the strongest to weakest order of inter molecular forces is butane > propane > ethane > methane .

Answer:

The answer is C4H10-C3H8-C2H6-CH4

Explanation:

100% CORRECT

1) The type of bond in metalloids to metal is metallic bond.

Metallic bond is a type of chemical bond.  

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

Metallic radius is defined as one-half of the distance between the two adjacent metal ions.  

Metallic bond increace electrical and thermal conductivity.  

Metals conduct heat, because when free moving electrons gain energy (heat) they vibrate more quickly and can move around.  

2) The type of bond in nonmetal is covalent bond.

Nonmetals have low electrical and thermal conductivity.

Hello,

Question - Which of the following is plotted on the y-axis of a distance versus time graph?

Answer - A. Distance

Why - The reason its distance is because the fact that distance is a dependant variable and always will remian on the y axis.

The Ideal Gas Law allows us to assume that at constant volume the variation in pressure is proportional to the variation in temperature.

Hence,

[tex]\frac{P1}{T1} = \frac{P2}{T2}\\ \\

\frac{4.50}{200} =\frac{P2}{250} \\ \\

P2 = \frac{4.50 * 250}{200}\\ \\

P2 = 5.63 atm[/tex]

Using Gay-Lussac's Law,  we get [tex]P_2[/tex]  [tex]5.625 atm[/tex] at [tex]250 K[/tex].

To find the new pressure of a gas at constant volume when the temperature changes, we use Gay-Lussac's Law, which states that pressure is directly proportional to temperature for a given mass of gas at constant volume. The formula for Gay-Lussac's Law is:

[tex]\frac{P_1}{T_1} = \frac{P_2}{T_2}[/tex]

Where:

Given:

[tex]P_1 = 4.50 \, \text{atm}[/tex]

[tex]T_1 = 200 \, \text{K}[/tex]

[tex]T_2 = 250 \, \text{K}[/tex]

[tex]P_2 = P_1 \times \frac{T_2}{T_1}[/tex]

[tex]P_2 = 4.50 \, \text{atm} \times \frac{250 \, \text{K}}{200 \, \text{K}}[/tex]

[tex]P_2 = 4.50 \, \text{atm} \times 1.25 \\ \implies P_2= 5.625 \, \text{atm}[/tex]

The new pressure of the gas at [tex]250 K[/tex] will be [tex]5.625 atm[/tex].

Answer:

1.   A model in the universe in which the sun, moon, stars, and planets all revolve around Earth.

2. Why did stars and planets get brighter at different times of the year if they were all moving in perfect circles around the earth? Why do some planets seem to stop and reverse direction in the sky?

3. Not all astronomical bodies revolve around Earth. Only the moon orbits earth, but that's all. In fact, Earth revolves around the sun just like all the other planets.

4. The parts about the planets revolving around something and the fact that they revolve.

5. Mass and distance.

6. The law of universal gravitation states that every mass attracts other masses with a force that is directly proportional to the product of the two masses and is inversely proportional to the square of the distance separating them.

7.

    1. All objects with mass (no matter how small) exert a gravitational attraction.

    2. The more massive an object is, the stronger its gravitational force.

    3. The greater the distance between the objects, the weaker the gravitational force.

Explanation:

Formula for water? There is no formula, but there is a symbol, if that's what you meant. The symbol for water is H2O. It means 2 Hydrogen molecules, because the symbol is H. And the O stands for Oxygen. So it meands two hydrogen molecules bonded with one oxygen molecule. Hope I helped :)

Answer:

Explanation:

what do you mean do you mean H2O

Answer:

A.C. and E.

Explanation:

i just got it right so that's it.

Anything in orbit around the Sun is basically moving fast enough to be in a constant state of freefall towards it. If the planets, for example, suddenly stopped moving they would immediately be pulled towards the Sun and fall into it.

The density of Jena’s smoothie is 0.667 g/mL.

Mass = 200 g

Volume = 300 mL

Density = mass/volume = 200 g/300 mL = 0.667 g/mL

Answer:

rounded it is 0.67 g/ml

Explanation: i took the test it was a bit confusing but i figured it out

Answer:

D

Explanation:

Edge trust me

The electron domain geometries that result in a bent molecular shape are:

A bent molecular shape occurs when there are two bonded atoms and one or more lone pairs around the central atom.

A common example of a molecule with a bent shape is water. In a water molecule, the central oxygen atom is bonded to two hydrogen atoms and has two lone pairs of electrons, resulting in a bent molecular shape with a bond angle of approximately 104.5 degrees.

Thus, the shapes are;

Trigonal Planar with two atoms and one lone pair

Tetrahedral with two atoms and two lone pairs.

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