What is the wavelength of a photon with an energy of 3.50 x 10^-19 J ?

Answer:

Atomic number is protons

Explanation:

Protons = positive charge

Answer:

B

Explanation:

In order for any conduction to take place it needs to go through a solid. Therefore it cannot travel through empty space

Answer:

b

Explanation:

Answer:

3.16g of the ester are produced

Explanation:

First, we need to determine the limiting reactant of the reaction converting each reactant to moles:

Moles CH3COOH (Molar mass: 60g/mol):

3.58g *  (1mol / 60g) = 0.05967moles

Moles C5H11OH (Molar mass: 88.15g/mol):

4.75g * (1mol / 88.15g) = 0.05389 moles

As the reaction is 1:1, limiting reactant is C5H11OH.

Theoretical moles of the ester CH3COOC5H11 is 0.05389 moles.

As only the 45.00% is produced:

0.05389 moles * 45.00% =

0.02425 moles of CH3COOC5H11 are produced.

In mass (Molar mass CH3COOC5H11: 130.1849g/mol):

0.02425 moles * (130.1849g / mol) =

Answer:

B

Explanation:

Particles in a solid have fixed locations in a volume that does not change. Solids have a definite volume and shape because particles in a solid vibrate around fixed locations.

Answer:

i am pretty sure it is

Development

Mining

Land reclamation

Explanation:

Answer:

its development, mining, and agriculture I just took the assignment and got it right.

Explanation:

Answer

The answer is: a hidden element, such as a valuable collectible item, or novelty item

Explanation:

Answer:

3.74 L

Explanation:

1.87 L of oxygen gas is used in the reaction

The reaction is

[tex]2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)[/tex]

2 moles of [tex]SO_2[/tex] reacts with 1 mole of [tex]O_2[/tex]

Same concept can be used for volume

2 L of [tex]SO_2[/tex] reacts with 1 L of [tex]O_2[/tex]

Now 1.87 L of [tex]O_2[/tex] is used so

[tex]2\times 1.87\ \text{L}=3.74\ \text{L}[/tex] of [tex]SO_2[/tex] reacts with 1.87 L of [tex]O_2[/tex].

The volume of sulfur dioxide that will react with the required amount of oxygen is 3.74 L.

The volume of sulfur dioxide gas, SO₂ needed to react completely with 1.870 L of oxygen gas at constant temperature and pressure is 3.74 L

We'll begin by calculating the volume of SO₂ that reacted from the balanced equation. This can be obtained as follow:

2SO₂(g) + O₂(g) → 2SO₃(g)

From the balanced equation above,

1 L of O₂ reacted with 2 L of SO₂

From the balanced equation above,

,1 L of O₂ reacted with 2 L of SO₂

Therefore,

1.870 L of O₂ will react with = 1.87 × 2 = 3.74 L of SO₂

Thus, the volume of SO₂ needed to react completely with 1.870 L of O₂ is 3.74 L

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Answer:

C7H9 + 3HNO3 → C7H6(NO2)3 + 3H2O

Explanation:

Answer:

T

Explanation:

Bacteria are prokaryotic cells. They do not have a nuclear membrane and chloroplast is also absent. In photosynthetic bacteria, there are lamellae called thylakoids which contain enzymes and bacterial chlorophyll necessary for photosynthesis.

Answer:

0.389 M

Explanation:

Using the formula; CaVa = CbVb

Where;

Ca = concentration of acid

Cb = concentration of base

Va = volume of acid

Vb = volume of base

Based on the provided information in the question, Va = 30mL, Ca=?, Vb = 27.83mL, Cb = 0.4190 M

Hence, CaVa = CbVb

Ca = CbVb/Va

Ca = 0.4190 × 27.83 ÷ 30

Ca = 11.6607 ÷ 30

Ca = 0.3886

Ca = 0.389 M

Therefore, the concentration of acetic acid in the vinegar is 0.389 M

Answer: its 4xb236.52

Explanation:

Answer:

[tex]m_{Zn(OH)_2}=38.4g[/tex]

Explanation:

Hello!

In this case, for the undergoing chemical reaction:

[tex]ZnO(s)+H_2O(l)\rightarrow Zn(OH)_2[/tex]

We evaluate the yielded moles of zinc hydroxide by each reactant as shown below:

[tex]n_{Zn(OH)_2}^{by ZnO}=35.4gZnO*\frac{1molZnO}{81.38gZnO}*\frac{1molZn(OH)_2}{1molZnO} =0.435molZn(OH)_2\\\\n_{Zn(OH)_2}^{by H_2O}=6.96gH_2O*\frac{1molH_2O}{18.02gH_2O}*\frac{1molZn(OH)_2}{1molH_2O} =0.386molZn(OH)_2[/tex]

In such a way, since the water yields a smaller amount of zinc hydroxide we conclude it is the limiting reactant so the maximum mass is computed below:

[tex]m_{Zn(OH)_2}=0.386molZn(OH)_2*\frac{99.424 gZn(OH)_2}{1molZn(OH)_2} \\\\m_{Zn(OH)_2}=38.4g[/tex]

Because the water limits the yielded amount of zinc hydroxide.

Best regards!

see the picture attached to my answer

Answer:

[tex]K_{2} O+2HNO_{3}--> 2K_{2} NO_{3} + H_{2} O[/tex]

Explanation:

Answer:

* No precipitate: [tex]LiOH(aq)+NaCl(aq)\rightarrow LiCl(aq)+NaOH(aq)[/tex]

* Precipitate: [tex]3BaCl_2(aq) +2Na_3PO_4(aq) \rightarrow Ba_3(PO_4)_2(s)+6NaCl(aq)[/tex]

* Precipitate: [tex]MgSO_4(aq)+2KOH(aq)\rightarrow Mg(OH)_2(s)+K_2SO_4(aq)[/tex]

Explanation:

Hello!

In this case, since these all are double displacement reactions, in which the cations and anions are exchanged, we can write the resulting chemical reactions as follows:

a. LiOH and NaCl: No precipitate is formed since LiOH and NaOH are both largely soluble in water:

[tex]LiOH(aq)+NaCl(aq)\rightarrow LiCl(aq)+NaOH(aq)[/tex]

b. BaCl2 and Na3PO4: barium phosphate precipitate is formed because it has a large molar mass which makes it insoluble in water:

[tex]3BaCl_2(aq) +2Na_3PO_4(aq) \rightarrow Ba_3(PO_4)_2(s)+6NaCl(aq)[/tex]

c. MgSO4 and KOH: magnesium hydroxide "milky" precipitate is formed because it is not soluble in water:

[tex]MgSO_4(aq)+2KOH(aq)\rightarrow Mg(OH)_2(s)+K_2SO_4(aq)[/tex]

Moreover, we can relate the solubility of a substance by considering its polarity, molar mass and nature; usually, heavy substances tend to be insoluble in water as well as nonpolar compounds.

Best regards!

The combinations which will make precipiate after mixing are BaCl₂ & Na₃PO₄ and MgSO₄ & KOH.

Precipitate is a solid substance, which is insoluble in water or in any given solutions and settle down at the bottom of the vessel.

Precipitate will form when substance have higher size of ions which are not attracted by the water ions because of smaller size of water ions.

        BaCl₂(aq) + Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + 6NaCl(aq)

       MgSO₄(aq) + 2KOH(aq) → Mg(OH)₂(s) + K₂SO₄

Because of the higher size of ions of Ba₃(PO₄)₂ & Mg(OH)₂ they are insoluble in water.

Hence combination of BaCl₂ & Na₃PO₄ and MgSO₄ & KOH will make precipitate.

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Answer:

This question appears incomplete

Explanation:

This question appears incomplete because of the absence of options. However, when a solid substance conducts electricity when dissolved in water (or in it's aqueous form) and has a high melting and boiling point, that substance is likely to be an electrovalent or ionic compound. This is because, ionic compounds are crystalline solids at room temperature with the properties above. Examples of ionic compounds are sodium chloride (NaCl) and potassium iodide (KI). The type of bond present in these compounds is what is referred to as the electrovalent/ionic bond.

Answer: Ice wedging

Explanation:

Irrelevant things

The number of molecules in 2.5 moles of sucrose is 1.5055 x 10²⁴.

Molecules are the smallest particle of a substance that retains the chemical and physical properties of that substance. They are made up of two or more atoms that are chemically bonded together.

It is required to use Avogadro's number, which is 6.022 x 10²³ molecules per mole.

Given information,

Moles = 2.5

Now,

The formula for sucrose is C₁₂H₂₂O₁₁, which means that each molecule contains 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms.

The equation to determine the number of molecules is:

Number of molecules = moles x Avogadro's number

Number of molecules = 2.5 mol x 6.022 x 10²³ molecules/mol

Number of molecules = 1.5055 x 10²⁴ molecules

Therefore, there are approximately 1.5055 x 10²⁴ molecules in 2.5 moles of sucrose.

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covalent bonds can form between two nonmetal atoms

covalent bonds can form between atoms of the same element

covalent bonds can form between atoms of different elements

Considering the definition of covalent bonding, the correct answers are:

Chemical bonds are the forces that hold atoms together within compounds.

A covalent bond occurs when atoms share electrons in equal parts, forming a molecule.

In other words, in a covalent bond, the atoms stay together in order to be able to share the electrons in their outermost shell (called the valence shell) to achieve the stability of the molecule that has been formed with the bond. When atoms are joined by this type of bond, new entities are formed, made up of the joined atoms: molecules.

Covalent bonding occurs between atoms of non-metallic elements, which can be the same or different.

In summary, the correct answers are:

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Answer:

Mercury

Explanation:

Hope this Helps!

Mercury has the most elliptical orbit.

We have Solar System.

We have to find out which planet has the most elliptical orbit.

An ellipse is the set of all points on a plane whose distance from two fixed points (called foci) add up to a constant.

According to the question -

Whether the ellipse will be more flattened or round it depends upon the eccentricity of the ellipse. The eccentricity of the ellipse is the ratio of distance between focal points and length of major axis. Mathematically-

[tex]$e=\frac{c}{a}[/tex]

Now -  e is [tex]\alpha[/tex] a (c = constant). Greater is the a, larger will be e and

0 < e < 1.

In the solar system mercury has the most elliptical orbit with the maximum eccentricity of 0.2056.

Hence, Mercury has the most elliptical orbit.

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Answer:

b. 1.5 atm.

Explanation:

Hello!

In this case, since the undergoing chemical reaction suggests that two moles of A react with one moles of B to produce two moles of C, for the final pressure we can write:

[tex]P=P_A+P_B+P_C[/tex]

Now, if we introduce the stoichiometry, and the change in the pressure [tex]x[/tex] we can write:

[tex]P=1.0-2x+1.0-x+2x[/tex]

Nevertheless, since the reaction goes to completion, all A is consumed and there is a leftover of B, and that consumed A is:

[tex]x=\frac{1.0atm}{2}=0.5atm[/tex]

Thus, the final pressure is:

[tex]P=1.0-2(0.5)+1.0-(0.5)+2(0.5)\\\\P=1.5atm[/tex]

Therefore the answer is b. 1.5 atm.

Best regards!

The question is incomplete, the complete question is;

Suppose 0.981 g of iron (II) iodide is dissolved in 150. mL of a 35.0 m M aqueous solution of silver nitrate. Calculate the final molarity of iodide anion in the solution, You can assume the volume of the solution doesn't change shen th s sove m Be sure your answer has the correct number of significant digits

Answer:

0.014 M

Explanation:

We have to first obtain the number of moles of FeI2

Molar mass of FeI2= 310 g/mol

So n = 0.981/310 = 0.0031 mol

Volume of solution = 150mL or 0.15L

Concentration of AgNO3 = 35mM * 10^-3 = 0.035M

number of moles of AgNO3 =  0.035 x 0.15 = 0.00525 mol

es

Equation of the reaction;

2AgNO3 + FeI2 -------> 2AgI + Fe(NO3

)2

Amount of excess FeI2 = 0.00525 - 0.0031 = 0.00215mol

Concentration of excess iodide in solution = Concentration of excess FeI2/volume of solution = 0.00215/0.15 =  0.0143M

Answer:

Because during the observation, 2 moles of gold were present, while 4 moles were added to silver.

Explanation:

In the chart, the amount of moles of silver was more than the moles of gold.....therefore it takes more heat to melt all 4 moles of silver versus only 2 moles of gold.

The molar fusion of gold is 12.6, and the molar fusion of silver is 11.3. When adding the moles as seen in the chart, we simply multiply both elements by their according moles:

12.6 kJ/mol x 2–> 25.2 kJ/mol of gold.

11.3 kJ/mol x 4–>45.2 kJ/mol of silver.

Silver has a lower molar heat of fusion compared to that of gold. The silver sample required the most added heat to melt because it has a higher melting point.

The molar heat of fusion is the amount of heat required to melt one mole of a substance. A lower molar heat of fusion means that less heat is required to melt a mole of the substance. However, the melting point of a substance is the temperature at which it melts, and silver has a higher melting point than gold. This means that even though silver has a lower molar heat of fusion, it requires more heat to melt because it has a higher melting point.

To illustrate this, let's say we have a sample of silver and a sample of gold, both with a mass of 1 mole. The silver sample has a molar heat of fusion of 11.3 kJ/mol, while the gold sample has a molar heat of fusion of 12.6 kJ/mol. The silver sample also has a melting point of 961°C, while the gold sample has a melting point of 1064°C.

To melt the silver sample, we would need to add 11.3 kJ of heat. To melt the gold sample, we would need to add 12.6 kJ of heat. Even though the silver sample has a lower molar heat of fusion, it requires more heat to melt because it has a higher melting point.

Therefore, the silver sample required the most added heat to melt because it has a higher melting point, even though it has a lower molar heat of fusion.

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Answer:

It travel's about 4,000 km through the Earth in 13 minutes.

Answer:

4,000 km is the correct answer!!!

Answer:

How many electrons does each gold atom gain?

  Answer:3

How many electrons does each iodine atom lose?

   Answer:1

What is the total number of electrons that are moved in the oxidation-reduction reaction?

   Answer:6

Complete the final balanced equation based on the half-reactions.

2Au(OH)3+6 HI 2 Au +1 3I2 +6 H2O

For the reaction 2 Au(OH)₃ + 6 HI ⇒ 2 Au + 3 I₂ + 6 H₂O,

Each gold atom gains 3 electrons, each iodine atom loses 1 electron. The total number of electrons that are moved in the oxidation-reduction reaction is 6.

Let's consider the following unbalanced redox reaction.

Au(OH)₃ + HI ⇒ Au + I₂ + H₂O

The reduction half-reaction is:

Au⁺³ + 3 e⁻ ⇒ Au

As we can see each gold atom gains 3 electrons.

The oxidation half-reaction is:

2 I⁻ ⇒ I₂ + 2 e⁻

As we can see each iodine atom loses 1 electron.

We can balance the equation by multiplying the reduction by 2, the oxidation by 3, and adding them. The total number of electrons exchanged is 6.

2 (Au⁺³ + 3 e⁻ ⇒ Au)

3 (2 I⁻ ⇒ I₂ + 2 e⁻)

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

2 Au⁺³ + 6 I⁻ ⇒ 2 Au + 3 I₂

The balanced redox reaction is:

2 Au(OH)₃ + 6 HI ⇒ 2 Au + 3 I₂ + 6 H₂O

For the reaction 2 Au(OH)₃ + 6 HI ⇒ 2 Au + 3 I₂ + 6 H₂O,

Each gold atom gains 3 electrons, each iodine atom loses 2 electrons. The total number of electrons that are moved in the oxidation-reduction reaction is 6.

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Answer:

vinegar or stomach acid im not quite sure

Explanation:

Answer:

neon is about five times more massive than helium.

Explanation:

got this one right lol

Answer:

A.  any absorbance of light by the solvent AND the cuvette needs to be accounted for

Explanation:

Blank calibrations are usually carried out on the spectrometer to eliminate and account for any readings that would come from absorptions of the curvette, solvents/reagents or anything that is not the main analyte we are testing for.

Hence the blank solution does not contain the analyte itself. Fingerprints should be removed from the curvette as practice. Hence the most suitable answer amongst the options is A.

I hope this was clear ad most of all, helpful.

The blank has been resulted in for accounting the absorbance of light by the solvent and the cuvette. Thus, option A is correct.

For performing the spectroscopic measurement of an analyte, the system has been blanked with the cuvette and the solvent. This has been performed as the solvent medium, the environment and the cuvette have their own absorption.

The analysis of the analyte without performing blank has consisted of the absorbance of the solvent and cuvette as well. Thus, in order to attain a pure analyte absorbance, the spectrometer has been analyzed with the blank.

The blank has been resulted in for accounting the absorbance of light by the solvent and the cuvette. Thus, option A is correct.

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Answer:

15.0 g

Explanation:

Step 1: Given and required data

Step 2: Calculate the mass (m) of water

334 kJ are required to melt 1 kg of ice at 0°C (melting point of water). We can calculate the mass of ice melted by 5.01 kJ using the following expression.

Q = ΔH°fus × m

m = Q / ΔH°fus

m = 5.01 kJ / (334 kJ/kg)

m = 0.0150 kg = 15.0 g

Answer:

What are the following substances?

Explanation:

Answer:

since,hydrogen bonding requires a strongly electronegative atom bonded to a hydrogen atom,only HF willexhibit hydrogen bonding,as afluorine is sufficiently partially positive hydrogen that can form bondwith a lone pair an oxygen in water .

Hope this help u