What effects the degree of polarisation of an anion?

Complete combustion of 8.00 g of a hydrocarbon produced 25.7 g of CO₂. The empirical formula for the hydrocarbon is C₄H₇.

The empirical formula of the molecule is the simplest whole number of atoms of a compound.

Moles of C in the compound:  27.8 g CO2 x 1 mol CO2/44 g x 1 mol C/mole CO2 = 0.632 moles of C

Moles of H in the compound:  9.96 g H2O x 1 mol H2O/18 g x 2 mol H/mol H2O = 1.11 moles of H

mass C = 0.632 mol C x 12 g/mol = 7.58 g C

mass H = 1.11 mol H x 1 g/mol = 1.11 g H

Sum = 8.69 g total mass (close enough to 8.70 so our assumption of no oxygen is correct)

To find the lowest whole number of moles, we can divide both by the lowest value (0.632) to obtain.

moles C = 0.632/0.632 = 1.0

moles H = 1.11/0.632 = 1.75

Now to get a whole number for H we can multiply both by 4 to obtain

moles C = 4

moles H = 7

Thus, the Empirical formula is C₄H₇.

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The percent  by volume of a solution : 19.23%

Given

50 ml of ethanol

210  ml of water

Required

The percent  by volume of a solution

Solution

Percent Volume (% v/v) : volume (ml) of solute/100 ml of solution ⇒ ratio of the volume of the solute to total volume of the solution

\(\tt \%solute(v/v)=\dfrac{solute~volume}{solution~volume}\times 100\%\)

solute= Ethanol

solvent=water

Solution = solute+solvent

Total volume of the solution :

\(\tt =volume~of~Ethanol+solume~of~water\\\\=50~ml+210~ml\\\\=260~ml\)

Percent by volume :

\(\tt \%volume=\dfrac{50}{260}\times 100\%\\\\\%volume=19.23\%\)

Answer: its blank???

Explanation:

Correct option is option C, C-O σ* bond.

Let's discuss it further below.

SNAc is an acronym for substitution nucleophilic acyl cyclic mechanism. The SNAc mechanism describes a nucleophilic substitution reaction in which an acyl group is transferred between two molecules, forming a cyclic intermediate.

In this reaction, the LUMO (lowest unoccupied molecular orbital) is the antibonding molecular orbital of the C-O σ bond, represented as C-O σ*.

This is because the LUMO is the orbital that accepts electrons during the nucleophilic attack, and the C-O σ* bond is the antibonding orbital involved in the breaking of the bond between the carbonyl carbon and the oxygen of the ester. Therefore, the correct answer is option C, C-O σ* bond.

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The complete ionic equation for the reaction between lithium sulfide (Li2S) and copper(II) nitrate (Cu(NO3)2) can be written as:

2Li+ (aq) + S2- (aq) + 2Cu2+ (aq) + 4NO3- (aq) -> 2Li+ (aq) + 2NO3- (aq) + Cu2S (s)

When aqueous solutions of lithium sulfide (Li2S) and copper(II) nitrate (Cu(NO3)2) are mixed, the following ionic reaction occurs:

Lithium sulfide dissociates into lithium cations (Li⁺) and sulfide anions (S²⁻), while copper(II) nitrate dissociates into copper(II) cations (Cu²⁺) and nitrate anions (NO₃⁻). In the reaction, the lithium cations and sulfide anions combine with the copper(II) cations and nitrate anions to form lithium cations and nitrate anions in the aqueous solution. Simultaneously, copper sulfide (Cu₂S) is produced as a solid precipitate which indicates a chemical reaction has taken place.

2Li+ (aq) + S2- (aq) + 2Cu2+ (aq) + 4NO3- (aq) -> 2Li+ (aq) + 2NO3- (aq) + Cu2S (s)

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0.05104 kcal/g is the calorific value of potato chips

Let the calorific value of potato be H cal/g

so, the heat of potato chips is 2.5g × H =2.5H

The specific heat of water is 1 cal g⁻1 °C⁻¹

The heat of water = 31.9 g × 1 cal g⁻1 °C⁻¹ ( 21.3-17.3)°C

                              = 31.9 × 4 cal

                              = 127.6 cal

hence, 2.5H = 127.6 cal

H = 127.6/2.5 = 51.4 cal/g = 0.05104 kcal/g

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Answer:

A.) Longer and Shorter

Explanation:

If the wavelength of a light wave is shorter that means the frequency will be higher.

That means that longer wavelengths have a lower frequency.

Answer:

1. Lanthanum-139 atom is the stable isotope of lanthanum with relative atomic mass 138.906348, 99.9 atom percent natural abundance and nuclear spin 7/2.

2. In fact, over 80% of electric cars sold globally utilized permanent magnet-based motors in 2019. These magnets are typically made with rare-earth materials such as neodymium and dysprosium, which have a very geographically constrained supply chain.

3. It is the second most reactive of the rare-earth metals after europium. Lanthanum oxidizes in air at room temperature to form La2O3. It slowly reacts with water and quickly dissolves in diluted acids, except hydrofluoric acid (HF) because of formation of a protective fluoride (LaF3) layer on the surface of the metal.

Explanation:

The acid must always be added to water with constant stirring because the process is highly exothermic and it can be dangerous. Therefore, the assertion is correct but the reason is incorrect.

1.Acid is thoroughly diluted with water before being added.

2.It should be introduced very gradually while being stirred continuously.

3.Acid addition to water is a highly exothermic reaction, releasing a lot of heat in the process.

4.The heat produced by the stirring is absorbed by the water, making the situation safer.

5.The amount of ions in a given volume are more concentrated when an acid and water are combined. However, it has nothing to do with continuously swirling acid into water.

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The equilibrium vapor pressure with respect to water (eow) is 259.9 Pa. assume that saturation vapor pressure is same as equilibrium vapor pressure.

Therefore, the RH at the frost point is  

RH = (eow / saturation vapor pressure) × 100

= (259.9 Pa / 259.9 Pa) × 100

= 100%

b) At T = -11 °C, we need to compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi) to determine if ice particles will form. From the given table, at T = -11 °C, the equilibrium vapor pressure with respect to water (eow) is 237.7 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 165.3 Pa.

The air is supersaturated with respect to ice, and the presence of Kaolinite particles can provide surfaces for water droplets to condense onto, leading to the formation of ice particles.

c) At T = -12 °C, we compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi). From the given table, at T = -12 °C, the equilibrium vapor pressure with respect to water (eow) is 217.3 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 181.2 Pa.

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The concept Boyle's law is used here to determine the new pressure of air inside the balloon. For a gas the relationship between volume and pressure is expressed using Boyle's law. The new pressure is 400 kPa.

The Boyle's law states that at constant temperature, the volume of a given mass of gas is inversely proportional to its pressure. The product of pressure and volume of a given mass of gas is constant.

Mathematically PV = k

P₁V₁ = P₂V₂

P₂ = P₁V₁ / V₂

100 × 4 / 1 = 400 kPa

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The samples with silver concentrations above the 100 ppb threshold are:

1x10⁻⁶ M:

1x10⁻⁵ M:

1x10⁻⁴ M:

1x10⁻³ M:

1x10⁻² M:

0.10 M:

To convert the silver concentrations from molarity (M) to parts per billion (ppb) by mass, we need to use the molar mass of silver and the density of the solution.

The molar mass of silver is 107.87 g/mol.

For the first, we can calculate the mass of silver in 1 liter of solution, second,  to convert a concentration from g/L to ppb, you can multiply the value by 10^6.

For 1x10⁻⁷ M:

Molar mass of Ag = 107.87 g/mol

Mass concentration = (1x10⁻⁷  M) x (107.87 g/mol) = 1.08x10⁻⁵ g/L x 10⁶ = 10.8 ppb (parts per billion)

For 1x10⁻⁶ M:

Mass concentration = (1x10⁻⁶ M) * (107.87 g/mol) = 1.0787 x 10⁻⁴ g/L  x 10⁶ = 107.87 ppb

For 1x10⁻⁵ M:

Mass concentration = (1x10⁻⁵ M) * (107.87 g/mol) = 1.0787x10⁻³ g/L x 10⁶ = 1078.7 ppb

For 1x10⁻⁴ M:

Mass concentration = (1x10⁻⁴ M) * (107.87 g/mol) = 1.0787x10⁻² g/L x 10⁶ = 10,787 ppb

For 1x10⁻³ M:

Mass concentration = (1x10⁻³ M) * (107.87 g/mol) = 0.108 g/L x 10⁶  = 107,870 ppb

For 1x10⁻² M:

Mass concentration = (1x10⁻² M) * (107.87 g/mol) = 1.08 g/L x 10⁶ = 1, 078,700 ppb

For 0.10 M:

Mass concentration = (0.10 M) * (107.87 g/mol) = 10.787 g/L x 10⁶  = 10,787,000 ppb

Based on the conversions above, the samples with silver concentrations above the 100 ppb threshold are:

For 1x10⁻⁶ M:

For 1x10⁻⁵ M:

For 1x10⁻⁴ M:

For 1x10⁻³ M:

For 1x10⁻² M:

For 0.10 M:

These samples have silver concentrations that exceed the 100 ppb threshold set by the EPA for safe drinking water.

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Answer:

Concept of chemi-fluorescence

Explanation:

A glow stick usually consists of two chemicals in a larger plastic tube: , a base catalyst (mostly sodium salicylate), and a suitable dye (sensitizer, or fluorophor). This creates an exergonic reaction when mixed together.

When a glow stick is bent, the flurophor which is a chemical that easily re-emits light upon excitation in smaller capsules is released into the other substance, there by causing it to emit radiation/light in the uv-visible region. The brightness and longevity of the glow stick is determined by varying the concentration of these chemicals.

I hope this explanation clarifies things.

Answer:

Explanation:

To be accurate, it must be able to make measurements that are close to the actual value.

Answer:

Answer: To be accurate, it must be able to make measurements that are close to the actual value.

Explanation:

Answer:

Many plants have thorns on their stems or leaves. What is the MOST likely explanation for the evolution of thorns?

A) Thorns help plants produce more food from photosynthesis.

B) Thorns are an example of a mutation that arises in the genetic code of plants.

C) Thorns help plants to conserve resources like water and soil nutrients that may be used by other organisms.

D) Thorns are an adaptation that some plants have evolved in order to discourage herbivores from eating the plant.

2)

Explanation:

option a is the answer

10

Answer:

I feel like the answer is A) true

Explanation:

you create a model to help your audience understand your complex idea. There have been models made to represent ideas that we cannot see.

Answer:

Yes

Explanation:

You can have 2s and have part of the 2p of the row in the p section.

The Types of Friction are;

Static Friction is a type of friction that stops objects from moving when a force is added and they aren't moving.

Kinetic friction happens when two things are rubbing against each other while they are moving. It tries to stop things from moving too fast.

Rolling friction happens when something rolls on a surface. Like a wheel moving on the ground. When objects move, it is easier for them to keep going because rolling friction (friction when something rolls) is usually less than kinetic friction (friction when something slides).

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______________________________________

The different types of friction are:

______________________________________

Friction is often called a necessary evil because it can be both helpful and harmful. On the one hand, friction is what allows us to walk, drive, and write, and it prevents objects from slipping and sliding out of our hands. On the other hand, friction can cause wear and tear on machines and vehicles, generate heat that can damage materials, and slow down or stop moving objects.

______________________________________

Friction should be reduced in certain situations to increase efficiency and reduce wear and tear. For example, reducing friction in engines and machines can increase fuel efficiency and decrease maintenance costs. However, friction should not be reduced in situations where it is necessary for safety, such as in car brakes or shoes.

______________________________________

Answer:

element

Explanation:

24 carat gold is an example of element.

A fundamental object that is difficult to divide into smaller pieces is known as an element. An element is a substance that cannot be broken down by non-nuclear reactions in chemistry and physics.

The atomic number, or quantity of protons in an element's nucleus, is used to categorize each element. Isotopes can be produced depending on the amount of neutrons in the nucleus.

Isotopes will have different physical properties although sharing the same chemical ones. Deuterium contains one proton and one neutron, tritium has one proton and two neutrons, but normal hydrogen has one proton and no neutrons.  

Therefore, 24 carat gold is an example of element.

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The balanced chemical equations are shown below:

1. Al (s) + 3HCI (aq) → AlCl3 (aq) + 3H2(g)

2. 2K (s) + 2H2O (1) → 2KOH (aq) + H2 (g)

3. 3Mg (s) + N2 (g) → Mg3N2 (s)

4. 2NaNO3 (s) → 2NaNO2 (s) + O2(g)

5. Ca(OH)2 (s) + 2H3PO4 (aq) → Ca3(PO4)2 (s) + 6H2O (1)

6. C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (g)

7. 4NH3 (g) + 5O2 (g) → 4NO (g) + 6H2O (g)

8.  N2 (g) + 3H2 (g) → 2NH3 (g)

9. Na2CO3 (s) + 2HCI (aq) → 2NaCl (aq) + CO2 (g) + H2O (1)

10. C3H5OH (1) + 9O2 (g) → 3CO2 (g) + 4H2O (g)

11. 2NH3 (g) + 3CuO (s) → N2 (g) + 3Cu (s) + 3H2O (g)

Step 1. count the atoms on each side.

step 2. change the coefficient of one of the substances.

step 3.  count the numbers of atoms again and, from there,

step 4. repeat steps two and three until you have  balanced the equation.

A chemical equation is described as the symbolic representation of a chemical reaction in the form of symbols and chemical formulas.

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Answer: 8/9

Explanation: took the quiz gang

Question a

Step 1

The average atomic mass of the element is calculated as:

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

Step 2

Information provided:

Isotope 1:

10.0 % abundant and 23.8 amu.

Isotope 2:

40.0 % abundant and 24.6 amu.

Isotope 3:

25.8 amu, the % abundant = 100 % - 10.0 % - 40.0 % = 50.0 %

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

Step 3

Procedure:

Average atom mass = (10.0% x 23.8 amu + 40.0% x 24.6 amu + 50.0 % x 25.8 amu)/100 = 25.12 amu

Answer: 25.12 amu

The weight of each stopper can vary based on the material, size, and manufacturing process used, so it is not possible to determine the number of rubber stoppers needed without more information.

Weight is a measure of the force of gravity on an object and is typically measured in units of Newtons (N), pounds (lb), or kilograms (kg).

Average weight, on the other hand, refers to the sum of the weights of a group of objects divided by the number of objects in the group. It provides an estimate of the typical or central value of the weights in the group. The units of average weight are the same as the units used to measure weight.

The number of rubber stoppers needed to contain the same number of stoppers as there are corks in 1.0 kg of corks would depend on the average weight of each type of stopper.

The weight of each stopper can vary based on the material, size, and manufacturing process used, so it is not possible to determine the number of rubber stoppers needed without more information.

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Rewriting the above question in a clearly manner,

"If the size of a radioactive sample is doubled, what happens to the activity of the sample in Becquerel (Bq)? Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer.

The activity of the sample ________.

The number of ________ per second ________ to the number of ________ gram(s)."

ANSWER: The activity of the sample increases.

The number of decays per second doubles to the number of atoms/gram.

Radioactive decay is the process of spontaneous decay of a nucleus into another nucleus.
In a radioactive decay, the parent nuclide disintegrates into a different daughter nuclide while emitting an alpha particle, beta particle, or gamma rays.

When radioactive decay occurs, radiation is emitted as particles or electromagnetic radiation. The amount of radioactive substance in a sample, as well as the radioactive isotopes present in it, determine the activity of a radioactive sample. This is the rate at which radiation is emitted by the sample.

In a nuclear reaction, the activity of a radioactive substance is expressed in Becquerel (Bq). This is the amount of radioactive substance that decays in one second. One Bq equals one radioactive decay per second.

In summary, if the size of a radioactive sample is doubled, the activity of the sample in Bq is also doubled.

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Answer:

2

Explanation:

Because 2 oxygen atoms in reactant are balanced only when 2H2O is produced.

This is defined as a chemical substance which can react with a base to form a salt in a reaction.

The appropriate acid suffixes and conditions is however correctly given above.

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Answer:

a

Explanation:

becuse the way is look

Answer:

Valence electrons are the electrons on the outermost energy level of an

atom.

The correct answer will be Valence electrons are the electrons on the outermost energy level of an atom.

No precepitate formed because all salt formed in the reaction are soluble in water.

Balanced chemical reaction: 2FeCl₃(aq) + 3Na₂SO₄(aq) → Fe₂(SO₄)₃(aq) + 6NaCl(aq)

This chemical reaction is double displacement reaction - cations and anions of the two reactants switch places and form two new compounds.

FeCl₃ is iron(III) chloride and it is soluble in water

Na₂SO₄ is sodium sulfate and it is soluble in water

Fe₂(SO₄)₃ is iron(III) sulfate and it is soluble in water

NaCl is sodium chloride and it is soluble in water

aq means soluble in water

In this chemical reaction, there are no acids and bases, only the salts.

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