Why is ethylene an important raw material used in the production of plastics, but ethane is not?

The pH is the measure of hydrogen ion concentration in a solution. The hydrogen ion concentration at pH 1.25 is  \(\rm\bold{ 5\;\times 10^{-2}\;M}\).

The pH is the negative logarithmic value of the hydrogen ion concentration in the sample.

The pH can be expressed as:

\(\rm pH=-log[H^+]\)

The hydrogen ion concentration can be given as:

\(\rm [H^+]=10^{-pH}\)

The given pH is 1.25 The hydrogen ion concentration is given as:

\(\rm [H^+]=10^{-1.25}\\H^+=0.05\;M\\H^+=5\;\times\;10^-^2\;M\)

The hydrogen ion concentration in the solution is \(\rm 5\;\times\;10^{-2}\;M\).

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Answer: 5.62 x 10n M n=-2

(5.62) (-2)

Explanation:

Answer: Predominant tropical easterly winds sweep across the central and southern portions of the state, keeping the temperatures mild

Explanation:

bc

The concentration of diluted solution is 0.2 M.

The concentration and volume are related by the formula - \( M_{1}\) \( V_{1}\) = \( M_{2}\) \( V_{2}\), where \( M_{1}\) and \( M_{2}\) are initial and final concentration. \( V_{1}\) and \( V_{2}\) are initial and final volumes.

Keep the values in relation to find the concentration of final diluted solution.

0.652 × 20.6 = \( M_{2}\) × (44.2 + 20.6)

Performing addition on Right Hand Side

0.652 × 20.6 = \( M_{2}\) × 64.8

Performing multiplication and division

\( M_{2}\) = 13.43÷64.8

\( M_{2}\) = 0.2 M

Thus, the diluted solution is 0.2 M.

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Based on the data provided, the electric circuit is completed when the key is closed.

An electric circuit is a complete path through which electric current flows

An electric circuit can either be:

An electric circuit consists of :

Therefore, an electric circuit is completed when all the components are connected and the key closed.

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Answer:

Explanation: HAVE A GREAT DAY EVERYONE <3

The  things like magic, astrology and psychic predictions not considered science as it only consider on the proves given by the experiments and the theory not on the random predictions.

The science, any universe of source of knowledge that deals with the physical and chemical  world and its processes and that deals with the observations and experimentation with conclusion and results.

The magic is about the secret tricks done by magician and astrology is the observing the space and universe all above the earth and psychic deals with the human psychology.

Therefore, things like magic, astrology and psychic predictions not considered science as it only consider on the proves given by the experiments and the theory not on the random predictions.

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With 35.0 mL of a 0.1 M HCl solution neutralizing 25.0 mL of the NaOH solution, we find that the moles of NaOH are equal to the moles of HCl. Using this information, we calculate the molarity of NaOH to be 0.14 M.

To determine the concentration of the NaOH solution, we can use the concept of stoichiometry and the volume and concentration of the HCl solution used in the neutralization reaction. The balanced chemical equation for the reaction between HCl and NaOH is:

HCl + NaOH → NaCl + \(H_{2} O\)

From the equation, we can see that the mole ratio between HCl and NaOH is 1:1. This means that the number of moles of HCl used in the reaction is equal to the number of moles of NaOH present in the solution.

Given that it takes 35.0 mL of a 0.1 M HCl solution to neutralize 25.0 mL of the NaOH solution, we can use the equation:

Moles of HCl = Molarity of HCl × Volume of HCl solution

Moles of NaOH = Moles of HCl

Molarity of NaOH = Moles of NaOH / Volume of NaOH solution

Substituting the given values:

Moles of HCl = 0.1 M × 35.0 mL = 3.5 mmol

Moles of NaOH = 3.5 mmol

Volume of NaOH solution = 25.0 mL = 0.025 L

Molarity of NaOH = (3.5 mmol) / (0.025 L) = 140.0 mmol/L = 0.14 M

Therefore, the concentration of the NaOH solution is 0.14 M.

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The process by which the atoms of one or more substances are rearranged to form different substances is called a chemical reaction.

The manner of reorganizing atoms via way of means of breaking one set of chemical bonds and forming a brand new set is called a chemical reaction. A chemical change is a change in count wherein the materials that make up that count change into materials with specific chemical and bodily properties. In a chemical change, additionally known as a chemical reaction, atoms rearrange to shape new materials, which ends up in specific bodily properties, as well.

Thus, the process is known as chemical reaction.

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Answer:

I believe it would be 2

Explanation:

if there are 2 nitrogen molecules then there would have to be 2 hydrogen molecules but this could be completely wrong

if this happens to be right, ur welcome :3 here's a Jay Jay pic for u cuz why not

Answer:

Anwer is A  0.60

Explanation:

It is true that according to Hubble's law, the farther away a galaxy is, the faster it is moving away from us.

It is true that the formation of a star occurs when nuclear fusion begins to fuse light elements into heavier ones;

The distance to the nearest stars can be determined by parallax, the apparent shift of a start against background stars observed as the earth moves along its orbit. (Option B)

Based on the accompanying H-R Diagram, the type of start that has the greatest temperature is the blue giants (Option C)

Two hydrogen atoms come together in a nuclear fusion reaction to produce Helium Gas. (Option A).

Hubble's law, which essentially states that the velocity of a galaxy (or, as it is commonly plotted, its redshift) is precisely proportionate to its distance, also reveals crucial information about the condition of the universe. There should be no relationship between distance and velocity if the cosmos is static and unchanging.

Hubble's law is the physical cosmology observation that galaxies move away from Earth at a rate proportionate to their distance. In other words, the farther they are from Earth, the quicker they are travelling away.

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On the basis of their chemical and physical characteristics, the elements in the periodic table can be divided into groups or families.

Chemists can predict how elements will interact based on their positions in the periodic table by understanding elemental families. For example, alkali metals such as sodium and potassium are extremely reactive because they have a single valence electron.

Alkali metals, alkaline earth metals, halogens, noble gases, transition metals, and other substances are included in these families.

Because all members of a family have the same number of valence electrons—the outermost electrons involved in chemical bonding—the elements in that family share comparable chemical characteristics.

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Answer:

Explanation:

The question requires us to determine a proper equation to calculate the enthalpy change for the following reaction:

Considering the generic reactions and their associated enthalpy change given:

According to Hess' Law, enthalpy is a function of state, which means it does not depend on the path by which reactants are converted to products. Using this definition, we can rearrange the reactions 1 and 2 given (and apply all the changes required to their associated enthalpy change) in order to obtain the required reaction, and then calculate the enthalpy change of the final reaction considering the rearranged enthalpies of reactions 1 and 2.

Our final objective is to obtain a chemical equation that presents 1 mol of reactants A and B on the left side, and 1 mol of product C on the right side.

First, let's guarantee that we will have product C by multiplying reaction 2 by -1:

Next, we need to make sure that

Answer:

299792458/(485x10^-9)=6.181x10^14Hz    =  618.1THz

Frequency x Wavelength = Speed of Light

therefore  

Speed of light / Wavelength = Frequency

Answer:

C.) Lactobacillus

Explanation:

Is a prokaryote with a simple rod shaped structure. Similar to other prokaryotic bacterium of its shape it has a cell wall, and capsule.

If a blood sample has a relatively high carbaminohemoglobin content, you should expect the pH of that sample to be lower.

Carbaminohemoglobin is formed when carbon dioxide (CO₂) binds to hemoglobin in the blood. This process occurs primarily in tissues where metabolic processes produce CO₂ as a waste product. The CO₂ then diffuses into the blood, where it reacts with water to form carbonic acid (H₂CO₃). Carbonic acid dissociates into hydrogen ions (H⁺) and bicarbonate ions (HCO₃⁻).

A higher carbaminohemoglobin content indicates that there is an increased level of CO₂ in the blood. This results in a higher concentration of carbonic acid and, subsequently, a higher concentration of hydrogen ions. Since pH is a measure of the concentration of hydrogen ions in a solution, a higher concentration of hydrogen ions corresponds to a lower pH value. Therefore, a blood sample with a high carbaminohemoglobin content is expected to have a lower pH, which may be indicative of conditions such as acidosis or respiratory disorders affecting the CO₂ exchange between the blood and the lungs.

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The concentration of the solution in g per dm cube is 35.24 g/dm cube.

The amount of sand in grams is 0.2 g and the volume of the solution is two-thirds of a litre. We have to find the concentration of the solution in g per dm cube.To find the concentration of the solution in g per dm cube, we need to know the concentration of ethanol. As the concentration of ethanol is not given in the question, let us assume the concentration of ethanol is 100%. Therefore, the volume of ethanol in the solution is

(1 - 2/3) litres= 1/3 litres= 1000/3 mL.

As the density of ethanol is 0.789 g/mL,

the mass of ethanol in the solution is:

0.789 g/mL × 1000/3 mL= 789/3 g

The mass of the solution is:

789/3 g + 0.2 g= 2367/9 g

The volume of the solution in dm cube is:

2/3 L= 0.67 dm cube

The concentration of the solution in g per dm cube is: (2367/9 g)/(0.67 dm cube)≈ 35.24 g/dm cube.

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Explanation:

it helps in when the kidney has used the needful nutrients been taken then the unwanted waste product it sends it to the nervous system then the nervous system passes the waste product to the bladder in form of urine

Approximately 20.0 mL of 0.5 M NaOH will be used to completely neutralize 3.0 g of acetic acid (HC2H3O2) in the vinegar sample.

To determine the volume of NaOH required to neutralize the given amount of acetic acid, we need to use the stoichiometry of the balanced chemical equation between acetic acid and NaOH.

The balanced equation for the neutralization reaction between acetic acid and sodium hydroxide is:

HC2H3O2 + NaOH → NaC2H3O2 + H2O

From the equation, we can see that the stoichiometric ratio between acetic acid and sodium hydroxide is 1:1. This means that 1 mole of acetic acid reacts with 1 mole of NaOH.

First, we need to calculate the moles of acetic acid using its molar mass:

Molar mass of HC2H3O2 = 60.05 g/mol

Moles of HC2H3O2 = 3.0 g / 60.05 g/mol ≈ 0.04997 mol

Since the stoichiometric ratio is 1:1, the moles of NaOH required will be the same as the moles of acetic acid.

Now, we can calculate the volume of 0.5 M NaOH needed using the formula for molarity:

Molarity = Moles of solute / Volume of solution (in liters)

0.5 M = 0.04997 mol / Volume (in liters)

Rearranging the equation to solve for volume, we have:

Volume (in liters) = 0.04997 mol / 0.5 M = 0.09994 L

Since 1 L is equal to 1000 mL, we can convert the volume to milliliters:

Volume (in mL) = 0.09994 L * 1000 mL/L ≈ 99.94 mL

Rounding to the appropriate number of significant figures, we find that approximately 20.0 mL of 0.5 M NaOH will be used to completely neutralize 3.0 g of acetic acid in the vinegar sample.

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Yes, I am agree with the evaporating dish is not preheated, then the mass of the anhydrate will be heavier, resulting in a greater value for the anhydrate and a smaller value for "z" in this formula:

CuxCly • zH2O

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Answer: different metal salt being heated I believe

Explanation:

The reaction gives off different color for example barium chloride gives a green color

Answer:

They’re created by the use of metal salts. These salts are different from table salt, and in chemistry ‘salt’ refers to any compound that contains metal and non-metal atoms. Some of these compounds produce intense colors when they are burned, which makes them ideal for fireworks.

Explanation:

Answer:

C.) 4.85 x 10⁻¹⁹ J

Explanation:

To find the energy, you need to use the following equation:

E = hc / w

In this formula,

-----> E = energy (J)

-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)

-----> c = speed of light (3.00 x 10⁸ m/s)

-----> w = wavelength (m)

Once you have converted nanometers to meters, you can plug the given values into the equation and solve.

410 nm                1 m
-------------  x  ----------------------  =  4.10 x 10⁻⁷ m
                        1 x 10⁹ nm

E = hc / w

E = (6.626 x 10⁻³⁴ J*s)(3.00 x 10⁸ m/s) / (4.10 x 10⁻⁷ m)

E = 4.85 x 10⁻¹⁹ J

The ionic equation for dissolution and the solubility product (ksp) expression for each of the following slightly soluble ionic compounds.

(a) For PbCl2:
Dissolution: PbCl2 (s) → Pb²⁺ (aq) + 2Cl⁻ (aq)
Ionic equation: PbCl2 (s) ⇌ Pb²⁺ (aq) + 2Cl⁻ (aq)
Solubility product (Ksp) expression: Ksp = [Pb²⁺][Cl⁻]²

(b) For Ag2S:
Dissolution: Ag2S (s) → 2Ag⁺ (aq) + S²⁻ (aq)
Ionic equation: Ag2S (s) ⇌ 2Ag⁺ (aq) + S²⁻ (aq)
Solubility product (Ksp) expression: Ksp = [Ag⁺]²[S²⁻]

(c) For Sr3(PO4)2:
Dissolution: Sr3(PO4)2 (s) → 3Sr²⁺ (aq) + 2PO₄³⁻ (aq)
Ionic equation: Sr3(PO4)2 (s) ⇌ 3Sr²⁺ (aq) + 2PO₄³⁻ (aq)
Solubility product (Ksp) expression: Ksp = [Sr²⁺]³[PO₄³⁻]²

(d) For SrSO4:
Dissolution: SrSO4 (s) → Sr²⁺ (aq) + SO₄²⁻ (aq)
Ionic equation: SrSO4 (s) ⇌ Sr²⁺ (aq) + SO₄²⁻ (aq)
Solubility product (Ksp) expression: Ksp = [Sr²⁺][SO₄²⁻]

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Answer:

B. The rock gained mass because new rock formed around

the edge.

26 °C /

80 °F

Rock sample

Answer:

Explanation:

B. The rock gained mass because new rock formed around the edge

26 °C

80 °F

Answer:

Formaldehyde, ozone, carbon monoxide, and radon are common indoor air contaminants. Formaldehyde can come from building materials and household products, ozone can be produced by electronic devices, carbon monoxide can be produced by gas appliances, and radon can seep into homes from the ground. Sulfur oxides, on the other hand, are more commonly found in outdoor air pollution, particularly from industrial emissions and fossil fuel combustion.

When 1-propanol is heated in the presence of an acid, the reaction produces two products: 1-propene and water.

This reaction is known as an ether cleavage, and it is commonly used in the production of propene and other hydrocarbons.

It is an exothermic reaction, meaning that the heat generated from the reaction increases the rate of the reaction.

The other product of this reaction is water, which is produced when hydrogen from the 1-propanol molecule is removed and replaced with a hydroxyl group.

This reaction is an example of an acid-catalyzed dehydration, where an alcohol molecule is converted into an alkene molecule by the removal of the OH group and the addition of a hydrogen atom from the acid. The overall reaction is: C3H7OH + H2O → C3H6 + H3O+.

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Answer:

1.04 L.

Explanation:

What is given?

Temperature 1 (T1) = 240 K.

Pressure 1 (P1) = 670 mmHg.

Volume 1 (V1) = 1.28 L.

Temperature 2 (T2) = 198 K.

Pressure 2 (P2) = 680 mmHg.

What do we need? Volume 2 (V2).

Step-by-step solution:

To solve this problem, we have to use the combined gas law. The combined gas law expresses the relationship between the pressure, volume, and absolute temperature of a fixed amount of gas. For a combined gas law problem, only the amount of gas is held constant. The formula of combined gas law is:

We need to find the volume 2 (V2), so let's solve for this unknown value and let's replace the given data that we have:

The final volume for this case would be 1.04 L, the volume is being reduced.

The catalyst in the given reaction mechanism is O.(g) (atomic oxygen).

O3(g) → O2(g) + O(g) NO(g) + O3(g) → NO2(g) + O₂(g) O(g) + NO2(g) → O2(g) + NO(g). The correct answer is option: C .

The reaction mechanism involves the formation and consumption of O atoms at various steps. Ozone (O3) decomposes to produce O2 and O atoms. These O atoms then react with NO2 to form NO and O2, which are further involved in the formation of O3. Therefore, the O atoms produced from the decomposition reaction of O3 act as a catalyst in this reaction mechanism. The correct answer is option: C.

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Answer:

c

Explanation:

Answer:

its actually d

Explanation:

I dont know why all I know is c was wrong and d was correct