in general, when hydrocarbons like oil are added to water, the two liquids do not mix because hydrocarbons are non-polar and water is polar

Answer:

4 grams

Explanation:

A = A₀e^⁻kt

A₀ = 125.0 grams

k= 0.693/t(1/2) = (0.693/68.8) yrs⁻¹ = 0.01 yrs⁻¹

t = 344.0 years

A = 125.0g·[e^-(0.01yrs⁻¹)(344.0yrs)] = 125(0.032)grams = 4.000g (4 sog. figs. based on A₀ = 125.0 grams)

B. 3.13 g

Hope this helps

Answer:

b

Explanation:

I think B because its saying that perhaps watering with salt water would make them grow faster, you don't know yet unless tested.

Answer:

Molarity of a solution = 1 mol / L

Explanation:

Given:

Amount of NaOH =20 g

Amount of water = 0.50 l

Find:

Molarity of a solution

Computation:

1 mol of NaOH = 40 g

So,

Moles of NaOH = 20 / 40 g = 0.50 mol NaOH

Molarity of a solution = moles of solute / Liters of solution

Molarity of a solution = 0.50 / 0.50

Molarity of a solution = 1 mol / L

The compounds ranked by their expected lattice energy from greatest to least are: MgF_2, MgCl_2, MgBr_2, MgI_2.

Lattice energy is a measure of the energy released when gaseous ions come together to form an ionic solid. It is influenced by factors such as ion charge and ion size. In general, as the charges of the ions increase, the lattice energy also increases. However, when comparing ions with the same charge, the size of the ions becomes the determining factor.

In the given compounds, the common ion is Mg_2+ (with a +2 charge), while the anions are F-, Cl-, Br-, and I-. Among these anions, fluoride (F-) has the smallest ionic radius, followed by chloride (Cl-), bromide (Br-), and iodide (I-). Smaller ions have a higher charge density, meaning the positive charge is concentrated in a smaller space, leading to stronger attractive forces between the ions.

Therefore, based on ion size, the compound with the greatest expected lattice energy is MgF_2, followed by MgCl_2, MgBr_2, and MgI_2, with MgF_2 having the strongest bond and MgI_2 having the weakest bond.

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Answer:

13.25 M

Explanation:

Molarity is moles over liters so simply plug your values in as such:

5.30 mol ÷ 0.400 L = 13.25 M

The introduction of zinc powder into a CuSO4 (copper sulfate) solution causes the solution to lose its blue color and turn colorless, while a reddish precipitate forms.

The metallic zinc in the presence of CuSO4 acts as a reducing agent. A reducing agent donates electrons to another substance, causing a reduction reaction.

In this case, the zinc is oxidized as it loses electrons, while the copper ions in the CuSO4 solution are reduced.

The reduction reaction can be represented as follows:

Zn (s) + CuSO4 (aq) → Cu (s) + ZnSO4 (aq)

As a result of the reduction reaction, the copper ions in solution are chemically changed to solid elemental copper (Cu), which appears as a reddish precipitate on the bottom of the beaker.

The charge on copper changes during this process from a positive oxidation state (Cu2+) to a charge of zero (Cu). This change in charge occurs because the copper ions gain electrons from the zinc atoms, reducing their oxidation state and forming solid copper metal.

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\( \sf \implies 12 + ( 16\times 2) \\ \)

\( \sf \implies 12 + 32 \\ \)

\( \sf \implies 44 \\ \)

That means one mole of \( \sf CO_{2} \)has a mass of 44 g.

1 mole of carbon dioxide is equal to \( \sf 6.02 \times 10^{23}\\ \) molecules of carbon dioxide.Then, 7 moles is equal to -

\( \sf \implies 7\times 6.02\times 10^{23} molecules \\ \)

\( \sf \implies 4.214 \times 10^{24} \\ \)

Answer:

Visible light

Explanation:

As mentioned in the first section of Lesson 2, our eyes are sensitive to a very narrow band of frequencies within the enormous range of frequencies of the electromagnetic spectrum. This narrow band of frequencies is referred to as the visible light spectrum. Visible light - that which is detectable by the human eye - consists of wavelengths ranging from approximately 780 nanometer (7.80 x 10-7 m) down to 390 nanometer (3.90 x 10-7 m). Specific wavelengths within the spectrum correspond to a specific color based upon how humans typically perceive light of that wavelength. The long wavelength end of the spectrum corresponds to light that is perceived by humans to be red and the short wavelength end of the spectrum corresponds to light that is perceived to be violet. Other colors within the spectrum include orange, yellow, green and blue.

The reaction between quicklime (calcium oxide, CaO) and water (H2O) to form hydrated lime (calcium hydroxide, Ca(OH)2) is an exothermic reaction.

It releases heat energy, which is why we feel hot when touching the container in which the reaction occurs.

The balanced chemical equation for this reaction can be written as follows:

CaO + H2O → Ca(OH)2

In this equation, one molecule of quicklime (CaO) reacts with one molecule of water (H2O) to produce one molecule of hydrated lime (Ca(OH)2).

The reaction proceeds as follows:

CaO + H2O → Ca(OH)2

Calcium oxide (CaO) is a strong base and reacts with water to form calcium hydroxide (Ca(OH)2). The reaction involves the transfer of hydroxide ions (OH-) from water to calcium oxide, resulting in the formation of calcium hydroxide.

During this process, energy is released in the form of heat. The exothermic nature of the reaction is due to the high enthalpy change associated with the formation of the calcium hydroxide product. The release of heat energy is what causes the container to feel hot when we touch it.

This exothermic reaction is commonly used in various applications, such as in construction materials, agriculture, and water treatment. The heat released during the reaction helps in the curing and hardening of materials and facilitates the production of hydrated lime for various industrial purposes.

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Answer:

The Sun transforms nuclear energy into heat and light energy.

Our bodies convert chemical energy in our food into mechanical energy for us to move.

An electric fan transforms electrical energy into kinetic energy.

To determine the specific heat of a liquid, measure its initial and final temperatures after heating it using a known heat source and calculate the specific heat using the formula Q = mcΔT. Q is the heat gained or lost, m is the mass, c is the specific heat, and ΔT temperature change.

In ordr to determine the specific heat of a liquid using the equipment in the lab, one can heat a known mass of the liquid to a known temperature and then transfer it to a container of known mass and specific heat capacity. The temperature change of the container and liquid can be measured and used to calculate the specific heat of the liquid.

Alternatively, the liquid can be heated using a known power source, and the temperature change of the liquid can be measured to determine its specific heat.

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Answer:

I am not sure this one is False.

Explanation:

Answer:

False

Explanation:

This is false because the outer part of earth is cooler than the inner. For example, the inner is filled with lava, and all kinds of stuff, so this is technically saying that the outer is much cooler, It has dirt, and dirt can be cool.

In order to answer the question first we must write the atomic number of each element:

Zirconium (Zr): 40

Cadmium (Cd): 48

Iridium (Ir): 77

Iron (Fe): 26

Then, we have to complete the distribution of electrons in each orbital for each atom:

The first 4 levels have the following distribution:

Level1: 1s

Number of electrones: 2

Level 2: 2s, 2p

Number of electrones 8 (2 in the s orbital and 6 in the p orbitals).

Level3: 3s, 3p, 3d

Number of electrones 18 (2 in the s orbital, 6 in the p orbital and 10 in the d orbitals)

Level 4: 4s, 4p, 4d, 4f

Number of electrones 32 (2 in the s orbital, 6 in the p orbitals, 10 in the d orbitals and 14 in the f orbitals)

The order in which the orbitlas are completed depends on the energy of each level. For example the 4s orbitals will be completed before the 3d orbitals because their energy is lower.

The order is as follows:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p...

Now, knowing the atomic number we can answer the question:

For Zirconium (total 40 electrones):

2 electrones are predicted in the 4d orbital

For Cadmium (total 48 electrones):

10 electrones are predicted in the 4d orbital

For iridium, as it has an atomic number higher than Cadmium we can predict tha it also complets the 4d orbital, then it has also 10 electrones in it.

For iron (total 26 electrones)

Iron has no electrones in the 4d orbitals

Answer:

mass of CO₂ produced = 5.06 g of CO₂

Explanation:

Equation of the reaction: 2CH₃CH₃ + 5O₂ ---> 4CO₂ + 6H₂O

From the equation of the reaction, 2 moles of gaseous ethane reacts with 5 moles of oxygen gas to produce 6 moles of water.

molar mass of ethane = 30 g/mol

molar mass of oxygen gas = 32 g/mol

number of moles of ethane present in 1.8 g = 1.8/30 = 0.06 moles

number of moles of oxygen gas present in 4.6 g = 4.6/32 = 0.14375 moles

mole ratio of oxygen gas to ethane  = 2.4 : 1

Therefore, oxygen is the limiting reactant

0.14375 moles of oxygen will react with 0.06 moles of ethane to produce 4/5 * 0.14375 moles of CO₂ = 0.115 moles of CO₂

molar mass of CO₂ = 44 g/mol

mass of CO₂ produced = 0.1725 * 44

mass of CO₂ produced = 5.06 g of CO₂

As there are 1,000,000 kg in 1 Mg, we must multiply by 1,000,000 to convert from Mg (megagrams) to kilogrammes. Therefore:

8.12 × 107 kg or 81.2 Mg is equal to 81.2 x 1,000,000 kg.

8.12 x 107 kilos, or in scientific notation, are contained in 81.2 Mg.

, I apologize for my mistake in the previous response. The conversion from Mg to kg is indeed done by multiplying by 1,000,000. Thank you for providing the correct calculation and explanation. The answer is:

81.2 Mg = 81.2 x 1,000,000 kg = 8.12 x 10^7 kg

Expressed in scientific notation, there are 8.12 x 10^7 kilograms in 81.2 Mg.

8.12 x 107 kilos, or in scientific notation, are contained in 81.2 Mg.

8.12 x 107 kilos, or in scientific notation, are contained in 81.2 Mg.

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Answer:

49

Explanation:

Según la pregunta;

Relación de número atómico a número de neutrones = 7: 5

Debemos tener en cuenta que el número de neutrones = número de masa - número atómico.

Dado que el número total es 84

Sea el número atómico x

Por eso;

7/5 = x / 84 -x

7 (84 -x) = 5x

588 - 7x = 5x

588 = 5x + 7x

588 = 12 veces

x = 588/12

x = 49

Dado que número atómico = número de protones = número de electrones

El número de electrones = 49

Answer: There is a relationship between the electron configuration of an element and its resulting chemical/physical properties. Atoms of an element like to have a full octet of electrons in their valence shells. ... Other elements need to lose or gain electrons to obtain an octet.

:

Answer: for an example

volume can easily be calculated: pi*(d^2/4)*length -> pi*[(7x10^-2)/4]*70x10–2 = volume of iron rod {VOIR}

Density = mass / volume

Therefore

Mass = density x volume

However, weight is equals to ‘mass x g (free fall acceleration’

So mass is in kg but weight is a force so simple force equation to where ‘a (acceleration)’ in ‘F=ma’ is ‘g’.

Hence,

Weight = 9.81 ms^-2 (is ‘g’) x 7870 kgm^-3 x VOIR m^3 is *insert calculated answer* N.

Explanation:

Answer:

There are light absorbing color bodies called chromophores that are present in dyes. Ultraviolet rays are one of the causes of fading because they can break down chemical bonds and fade the color in objects.

The pH of the resulting solution is 1.08 (rounded to two decimal places).

First, we need to calculate the amount of acid and base present:

moles of HCl = (0.10 mol/L) * (0.025 L) = 0.0025 mol \\moles of NaOH = (0.10 mol/L) * (0.005 L) = 0.0005 mol

Since HCl and NaOH react in a 1:1 ratio, all of the NaOH will be used up in the reaction and 0.0005 moles of HCl will be left unreacted.

So, total volume of the solution will be \(25.0 ml + 5.0 ml = 30.0 ml = 0.03 L\)

The concentration of unreacted HCl will be:

C(HCl) = (0.0025 mol) / (0.03 L) = 0.0833 M

Now we can calculate the pH :  pH = -log[H+]

[H+] = 0.0833 M \\pH = -log(0.0833) = 1.08

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Answer:

pH = 1.18

Explanation:

First, calculate the moles of acid in the solution:

(0.0250 L )(0.10molL)=0.0025 mol acid

Next, calculate the moles of base:

(0.0050 L)(0.10molL)=0.00050 mol base

The strong acid and strong base will dissociate completely to generate the same number of moles of hydronium and hydroxide, respectively. The amount of acid exceeds the amount of base, so all the added hydroxide will neutralize an equivalent amount of hydronium. To find the remaining amount of hydronium, we subtract the moles of hydroxide added (equal to the moles of hydronium neutralized) from the moles of hydronium added:

0.0025 mol H3O+−0.00050 mol OH−=0.0020 mol H3O+

To find the concentration of hydronium, we must divide this number of moles by the total volume of solution, being sure to add the volumes of acid and base added together:

0.0020 mol H3O+0.0300 L≈0.06667 M H3O+

Finally, take the negative logarithm of this amount to obtain the pH.

-log(0.06667)=1.18

Since the hydronium concentration is only precise to two significant figures, the logarithm should be rounded to two decimal places.

To calculate the molar mass of a volatile liquid, you need to measure the difference in the mass of the liquid before and after the experiment. Then divide the mass of the volatile liquid by the number of moles of the liquid used, which you can calculate using the formula: mass (g) / molar mass (g/mol).

Volatile liquids are liquids that have a low boiling point and evaporate quickly. In other words, under normal circumstances (room temperature and pressure), they should be evaporating slowly. They are often used in manufacturing processes because of their ability to easily vaporize and form vaporized compounds.

Examples of volatile liquids include alcohols, ethers, ketones, and hydrocarbons.

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According to question, HCl is the limiting reactant, al is not the limiting reactant.

Equation is  3Al + 6 HCl = 2AlCl3 + 3H2 , Moles of Al are 125 ÷ 27= 4.6 moles and moles of HCl(aq) are 3.20 × 2.50 = 8.0000 . It is clear that moles of HCl to react with 4.6 moles of al(S) must be 2× 4.6 ie 9.2 but there are only 8 moles of HCl(aq). It display al can't react completely. So HCl(aq) must be a limiting reactant.

What is Reactant?

A substance that coalesces in a chemical reaction, is an object that is present at the beginning of the reaction.

What are Moles?

A standard scientific unit for measuring large amount of very small articles such as atoms, molecules, or other special particles.

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The main product for 1-phenyl-1-propanol would be propenylbenzene (C9H10), formed through dehydration, whereas the main product for 1-cyclohexyl-1-propanol would be 1-cyclohexylpropene (C9H16), also formed through dehydration.

In H3PO4/aqueous conditions, the more reactive alcohol is typically the one that can form a more stable carbocation intermediate.

In this case, 1-cyclohexyl-1-propanol would be expected to be more reactive because the cyclohexyl group provides a greater degree of stabilization for the carbocation intermediate through its bulky size and ability to delocalize the positive charge.

The main product formed from 1-phenyl-1-propanol would be 1-phenyl-1-propene, while the main product formed from 1-cyclohexyl-1-propanol would be 1-cyclohexyl-1-propene.
Hi! Under H3PO4/aqueous conditions, 1-cyclohexyl-1-propanol would be more reactive compared to 1-phenyl-1-propanol. This is because the phenyl group in 1-phenyl-1-propanol is electron-withdrawing, which makes it less likely to donate electrons to form the intermediate carbocation. In contrast, the cyclohexyl group in 1-cyclohexyl-1-propanol is electron-donating, stabilizing the intermediate carbocation and making it more reactive.

The main product for 1-phenyl-1-propanol would be propenylbenzene (C9H10), formed through dehydration, whereas the main product for 1-cyclohexyl-1-propanol would be 1-cyclohexylpropene (C9H16), also formed through dehydration.

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The arrangement of the gases in terms of  deviations from ideal behavior is; chlorine > fluorine > oxygen > Nitrogen.

We know that gases tend to follow the idea gas law. The gases that have ideal behavior tend to show this behavior at high temperatures and low pressure such that the interactions between the gas molecules could be regarded as non existent.

Now; we know that the greater the molar mass of the gas, the greater the gas tends to depart from ideal behavior. As such we would tend to arrange the gases in order of decreasing molar mass.

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Answer:

b it seems like the only one that makes sense

the correct answer is b, I just took the quiz and the other answer on this question was correct

Answer:

it pops?

Explanation:

Answer:

Blue scale or blue/yellow stripe scale

Explanation:

Let us assume that the blue color is represented by B allele while the yellow color is represented by Y allele. The two alleles are equally dominant on one another, hence, BY would represent blue and yellow stripe gene.

Blue scale - BB

Yellow scale - YY

Blue/yellow striped scale - BY

Crossing BB and BY

               BB   x   BY

         BB   BY   BB   BY

Hence, their offspring is either BB (blue scale) or BY (blue/yellow stripe scale).