cite specific situation that you experienced at home or in school where magnet used to seperate mixtures?​

Answer:

Polonium

Selenium

Sulfur

Oxygen

Explanation:

If you see in the Table S of the periodic Table there is a column that says First Ionization Energy (kJ/mol) and you can see the numbersof these elements so then you just put it in order

Polonium 812

Selenium 941

Sulfur 1000

Oxygen 1314

Answer:

d. all of the above are levels of organization

Explanation:

The followings are the levels of the organization in an ecosystem

1. Individual

2. Population

3. Community

4. Ecosystem

5. Biome

6. Biosphere

So as per the given situation, it involved all three levels that are mentioned in the question

hence, the correct option is d.

Therefore the same is to be considered

The given option are all consisting in the level of organization of ecosystem. Thus, option D is correct.

The ecosystem has been the geographical representation comprising plants, animals, and other biotic and abiotic components.

The ecosystem has been organized in the levels for the understanding of the working and the activity of the ecosystem. The levels of the ecosystem has been:

The organizational levels of the ecosystem have been comprised of community, population, and ecosystem. Thus all the given are level or organizations in the question. Thus, option D is correct.

For more information about the ecosystem, refer to the link:

https://brainly.com/question/1673533

Answer: selenium dichloride

Explanation:

Answer:

Ram Ranch

Explanation:

Answer: FLEXUP by lil yacthy and future and playboi carti one of the best songs right now

Explanation:

Answer:

λ = 0.029×10² m

f = 0.57×10¹⁷ s⁻¹

Explanation:

Given data:

Wavelength of wave = ?

Frequency of wave = 102.7×10⁶ s⁻¹

Solution:

Formula:

Speed of wave = Wavelength  × Frequency

speed of wave = 3×10⁸ m/s

by putting values,

3×10⁸ m/s = λ × 102.7×10⁶ s⁻¹

λ = 3×10⁸ m/s /  102.7×10⁶ s⁻¹

λ = 0.029×10² m

2nd)

Given data:

Wavelength of wave = 5.267 nm (5.267×10⁻⁹ m)

Frequency of wave =  ?

Solution:

Formula:

Speed of wave = Wavelength  × Frequency

speed of wave = 3×10⁸ m/s

by putting values,

3×10⁸ m/s = 5.267×10⁻⁹ m × f

f = 3×10⁸ m/s /  5.267×10⁻⁹ m

f = 0.57×10¹⁷ s⁻¹

Answer:

Distance of something it can be any type of distance

Answer:

uh A.)? [ZnCI2+H2]? /////////

Answer: 5000

Explanation:

Answer:

It should contain 32 hydrogen.

Answer:

You are right, it is the Engineer

Explanation:

Answer:

because the cells make drugs at the start of injury!

The mass of a single bromine molecule, Br₂ is 2.654 x 10⁻²² g.

Bromine is a diatomic element. It has a symbol Br and the atomic number is 35. Bromine is a naturally occurring element which is liquid at room temperature.

Molar mass of Br₂ is 159.808 g/mol. The molar mass of bromine is 79.904 g/mol. In Br₂, there are two bromine atoms.

To calculate the mass of a single bromine molecule -

In 1 mole of Br₂, there is Avogadro's number of molecules.

Avogadro's number = 6.022 x 10²³

Therefore, 1 mole = 6.022 x 10²³

1 mole of bromine has mass of 79.9 g/mol

So, it gives us -

1/6.022 x 10²³ = 1.66 x 10²³/79.9 = 2.654 x 10⁻²²g

For the mass of a single bromine molecule, Br₂ = 2.654 x 10⁻²² g

To learn more about bromine,

brainly.com/question/9080164

#SPJ1

Answer:

A and B

Explanation:

Trust me I just did it on a p e x

Answer: he’s correct it’s d and b for me but it’s the same answers

Explanation:

Explanation:

A chemical change is a change in which a new kind of substance is produced. Such changes are always accompanied by energy changes.

They are mostly reversible.

Some examples of such reactions are combustion, rusting of iron, precipitation, rancidity of butter, souring of milk.

Answer: The Avagadro constant = 6.022 x 10²³ denotes the no of molecules in one mole of the substance

Explanation:

Answer:

vapor pressure of methanol at 12.0C = 75.09 torr

Explanation:

Using Clausius Clapeyron equation

, we have that

ln (P2/P1)= (ΔHvap /R) (1/T1 - 1/T2)

Given

At Normal boiling point,

Temperature T1= 64.6°C = 64.6 + 273 = 337.6 K, Pressure,P1 = 1 atm

Heat of vaporization  = 35.2 kJ/mol

Changing to  J/mol

=35.2 x 1000= 35200 J/mol

Temperature , T2 = 12.0oC = 12 + 273 = 285 K

Using gas constant, R = 8.314 J/mol.K

ln (P2/P1)= -(ΔHvap /R) (1/T1 - 1/T2)

ln (P2/ 1 atm) = (35200 J/mol/ (8.314 J/mol.K) X( 1/337.6 - 1/285)

ln (P2/ 1 atm) =4,233.822 X (0.00296-0.003508)

ln (P2/ 1 atm)  = 4,233.822468  x-0.0005466866

ln (P2/ 1 atm)=  -2.31457

P2 = e^⁻2.31457 x 1 atm

P2=0.098808atm

= 0.098808atm  x760 = 75.09 torr

Answer:

B) 6

Explanation:

Methylcyclopentane consist of 3 types of hydrogen which are 1° (primary), 2° (secondary) and 3° (tertiary) hydrogen atoms. In the chlorination of methylcyclopentane, there are four monochlorinated products possible and two stereoisomers.

Answer:

ΔH°rxn = -780kJ

Explanation:

It is possible to find enthalpy change of a reaction by the sum of analogue reactions (Hess's law).

Using the reactions:

1. 2Al(s) + 3/2O2(g) → Al2O3(s)  ΔH°rxn = −1601 kJ/mol

2. 2Fe(s) + 3/2O2(g) → Fe2O3(s)  ΔH°rxn = −821 kJ/mol

1 - 2:

2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s)

ΔH°rxn = ΔH°rxn(1) - ΔH°rxn(2)

ΔH°rxn = −1601 kJ/mol - (-821 kJ/mol)

ΔH°rxn = -780kJ

Considering the Hess's Law, the enthalpy change for the reaction is -780 kJ.

Hess's Law indicates that the enthalpy change in a chemical reaction will be the same whether it occurs in a single stage or in several stages. That is, the sum of the ∆H of each stage of the reaction will give us a value equal to the ∆H of the reaction when it occurs in a single stage.

In this case you want to calculate the enthalpy change of:

2 Al(s) + Fe₂O₃(s) → 2 Fe(s) + Al₂O₃(s)

which occurs in two stages.

You know the following reactions, with their corresponding enthalpies:

Equation 1:  2 Al(s) + [tex]\frac{3}{2}[/tex] O₂(g) → Al₂O₃(s)      ΔH = −1601 kJ/mol  

Equation 2:  2 Fe(s) + [tex]\frac{3}{2}[/tex] O₂(g) → Fe₂O₃(s)      ΔH = −821 kJ/mol

Because of the way formation reactions are defined, any chemical reaction can be written as a combination of formation reactions, some going forward and some going back.

To obtain the enthalpy of the desired chemical reaction you need 2 moles of Al(s) on reactant side and it is present in first equation so let's write this as such.

Now, 1 mole of Fe₂O₃(s)   must be a reactant and is present in the second equation. Since this equation has 1 mole of Fe₂O₃(s)   on the product side, it is necessary to locate the Fe₂O₃(s)  on the reactant side (invert it). When an equation is inverted, the sign of ΔH also changes.

You know that two equations with their corresponding enthalpies are:

Equation 1:  2 Al(s) + [tex]\frac{3}{2}[/tex] O₂(g) → Al₂O₃(s)      ΔH = −1601 kJ/mol  

Equation 2:  Fe₂O₃(s)  → 2 Fe(s) + [tex]\frac{3}{2}[/tex] O₂(g)   ΔH = 821 kJ/mol

Adding or canceling the reactants and products as appropriate, and adding the enthalpies algebraically, you obtain:

2 Al(s) + Fe₂O₃(s) → 2 Fe(s) + Al₂O₃(s)     ΔH= -780 kJ

Finally, the enthalpy change for the reaction is -780 kJ.

Learn more:  

Answer:

Wrong

Explanation:

Because they are non metals and tends to form negative charged ions

The theoretical yield (in kilograms) of water produced from this reaction : 0.285 kg

Reaction

2C₁₂H₂₄O₁₁ + 25O₂ → 24CO₂ + 24H₂O

mass of C₁₂H₂₄O₁₁ - isomaltitol = 454 g

mol C₁₂H₂₄O₁₁(MW=344.31 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{454}{344.31 g/mol}\\\\mol=1.319[/tex]

mol H₂O based on C₁₂H₂₄O₁₁ as limiting reactant(O₂-oxygen as an excess)

From the equation above, mol ratio of C₁₂H₂₄O₁₁  : H₂O = 2 : 24, so mol H₂O:

[tex]\tt mol~H_2O=\dfrac{24}{2}\times 1.319=15.828[/tex]

then mass H₂O (MW=18 g/mol) :

[tex]\tt mass=mol\times MW\\\\mass=15.828\times 18=284.904~g=0.285~kg[/tex]

Answer:

1.59 molal

Explanation:

The definition of molality is:

So first we calculate the moles of solute (D-glucose, C₆H₁₂O₆), using its molar mass:

Then we convert grams of water into kg:

Finally we calculate the molality:

Answer:

C. A technological society has both a positive and negative impact on the environment

Explanation:

It is correct to suggest and to acclaim that a technological society has both a positive and negative impact on the environment.

The environment is the region of space where living organisms and non-living components can be found.

We see that technology has both negative and positive effects on the environment.

Answer:

See explanation

Explanation:

Nucleosynthesis is the process that creates new atomic nuclei from pre-existing ones via nuclear reactions.

A nuclear reaction involves the nucleus of atoms. It means the transformation of one element to another.

In the image attached i have shown the equations representing the nucleosynthesis of O, Ne, Na and Mg.

The nucleosynthesis of O involves the bombardment of C-12 with alpha particles, gamma rays are produced.

The nucleosynthesis of Ne involves the bombardment of O-16 with alpha particles, gamma rays are produced.

The nucleosynthesis of Na involves the bombardment of Ne-20 with alpha particles, protons are produced.

The nucleosynthesis of Mg involves the bombardment of Ne-20 with alpha particles, gamma rays are produced.

Answer:

C7H8N4O. The molecular formula C7H8N4O2 (molar mass: 180.16 g/mol) may refer to: Paraxanthine. Theobromine.

Answer:

180 g Ca

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

4.4 mol Ca

Step 2: Identify Conversions

Molar Mass of Ca - 40.08 g/mol

Step 3: Convert

[tex]4.4 \ mol \ Ca(\frac{40.08 \ g \ Ca}{1 \ mol \ Ca} )[/tex] = 176.352 g Ca

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

176.352 g Ca ≈ 180 g Ca

Answer:A

Explanation:Binary Fission, meaning ‘getting divided into half’ is a type of asexual reproduction where a single living cell grows twice its size and then splits to form two identical daughter cells, each carrying a copy of the parent cell’s genetic material. Examples of cells that use binary fission for division

Answer:

i think its a

Explanation:

Answer:

30 g/mol

Explanation:

Step 1: Given data

Step 2: Calculate the moles corresponding to 11.2 L of gas

At normal temperature and pressure (1 atm, 293.15 K), 1 mol of a gas has a volume of 24.05 L.

11.2 L × 1 mol/24.05 L = 0.466 mol

Step 3: Calculate the molecular mass of the gas

0.466 moles of the gas weigh 14 g. The molecular mass is:

M = 14 g/0.466 mol = 30 g/mol