please answer the questions in the picture

Answer:

First, we need to determine the molar mass of HCl.

The molar mass of HCl = the mass of hydrogen (1.008 g/mol) + the mass of chlorine (35.45 g/mol) = 36.45 g/mol.

Next, we can use Avogadro's number (6.02 x 10^23 molecules/mol) to convert the number of molecules to moles:

6.02 x 10^24 molecules / 6.02 x 10^23 molecules/mol = 10 moles

Finally, we can use the molar mass to convert moles to grams:

10 moles x 36.45 g/mol = 364.5 grams

Therefore, the mass of 6.02 x 10^24 molecules of HCl is 364.5 grams.

The formula of the hydrate, given that 10.00 g of the hydrated was heated and 7.342 g of solid, (NH₄)₃PO₄ was leftover is (NH₄)₃PO₄.3H₂O (option B)

First, we shall determine the mass of the water in the hydrate. Details below:

Mass of water, H₂O = Mass of hydrate - Mass of anhydrous

Mass of water, H₂O = 10 - 7.342

Mass of water, H₂O = 2.658

Finally, we shall determine the formula of the hydrate. Details below:

Divide by their molar mass

(NH₄)₃PO₄ = 7.342 / 149.09 = 0.049

H₂O = 2.658 / 18 = 0.148

Divide by the smallest

(NH₄)₃PO₄ = 0.049 / 0.049 = 1

H₂O = 0.148 / 0.049 = 3

Thus, the formula of the hydrate is (NH₄)₃PO₄.3H₂O (option B)

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In this reaction 10.8 moles of carbon dioxide was produced. 10.8moles of carbon monoxide used in this reaction to produce such number of moles of carbon dioxide.

In chemistry, a mole, usually spelt mol, is a common scientific measurement unit for significant amounts of very small objects like molecules, atoms, or other predetermined particles. The mole designates 6.02214076 1023 units, which is a very large number.

For the Worldwide System of Units (SI), the mole is defined as this number as of May 20, 2019, according to the General Convention on Measurements and Weights. The total amount of atoms discovered through experimentation to be present in 12 grammes of carbon-12 was originally used to define the mole.

2CO(g)+O[tex]_2[/tex](g)=2CO[tex]_2[/tex](g)

moles of carbon dioxide= 10.8 moles

According to stoichiometry

moles of carbon monoxide=  (2/2)× 10.8 =10.8moles.

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The equilibrium constant, which indicates how far a chemical process progresses, is a thermodynamic quantity.

The equilibrium constant is a ratio of the concentrations (or partial pressures) of the products to the concentrations (or partial pressures) of the reactants.

1) The equilibrium constant is;

Keq = 1/(3.5) * (1.5)^2

Keq = 0.13

2) 0.15 = [0.25]/1 * [CO2]

[CO2] = [0.25]/0.15

[CO2] =1.67

3) Ksp = [Mg^+] [Cl^-]^2

4 * 10^-2 = [Mg^+] *  [3.5 * 10^-3]^2

[Mg^+] = 4 * 10^-2/ [3.5 * 10^-3]^2

= 3.3 * 10^-5 M

4) Ksp = x^2

Ksp = (2 * 10^-3)^2

= 4 * 10^-6

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If you mix 20.0 mL of 0.010 M MgCl[tex]_2[/tex] with 20.0 mL of 0.0020 M Na[tex]_2[/tex]CO[tex]_3[/tex],  magnesium carbonate will not precipitate out from the solution.

The byproduct of the condensing of atmospheric water vapour that falls from clouds as a result of gravitational pull is referred to as precipitation in meteorology. Rain, sleet, slush, ice pellets, graupel, drizzle, and hail are the main types of precipitation.

When a region of the outside world becomes completely saturated with water vapour, the water condenses or "precipitates" or falls. Because the water vapour does not enough condense to precipitate, fog and mist are instead colloids rather than precipitation. magnesium carbonate will not precipitate out from the solution.

Ksp =[Mg²⁺][CO₃²⁻]

[0.010][20] = C₂×40

C₂=0.001M

Q= 0.005×0.001

   = 5×10⁻⁶M

Q<Ksp

precipitation will not occur

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Using a more concentrated HCl solution would help make the acid-base neutralization reaction go faster in removing limescale (CaCO₃) from your faucet.

The rate of the reaction generally increases with the concentration of the reactants, so a more concentrated HCl solution will react more quickly with the limescale than a less concentrated one.

Using something abrasive to grind the limescale into smaller pieces might help expose more surface area of the limescale to the acid, but it would not directly affect the rate of the acid-base neutralization reaction.

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The balanced redox reaction is:

6I2 + 42OH- → 6IO3- + 18H2O

We have to note that we can only say that a redox reaction have been balanced when the number of the electrons that were lost in the oxidation half equation is equal to the number of electrons that have been gained in the reduction half equation.

The balanced half reaction equations are;

I2 -→ IO3- + 6e (oxidation half-reaction)

6OH- + 6e- → 2H2O  (reduction half-reaction)

Thus adding the equations would give the balanced reaction equation.

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The number of molecules of silicon dioxide (SiO₂) present in 15 grams of the sample is 1.503×10²³ molecules (3rd option)

We'll begin by obtaining the mole of 15 g of SiO₂. This is shown below:

Mole = mass / molar mass

Mole of SiO₂ = 15 / 60.09

Mole of SiO₂ = 0.2496 mole

Haven obtain the mole, we shall determine the number of molecules. Details below:

From Avogadro's hypothesis,

1 mole of SiO₂ = 6.022×10²³ molecules

Therefore,

0.2496 mole of SiO₂ = 0.25 × 6.022×10²³

0.2496 mole of SiO₂ = 1.503×10²³ molecules

Thus, the number of molecules is 1.503×10²³ molecules (3rd option)

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Answer:

Chemistry B Semester Exam 5/4/2023

1. Cs-Br

2. K-C is ionic, and C-O is polar covalent

3. All molecules are in constant motion, so they all have some kinetic energy.

4. The reaction between substances A and B has a lower activation energy than the reaction between substances B and C.

5. More bond energy is absorbed on the reactants side than is released on the products side.

6. an exothermic reaction

7. Endothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants.

8. Heat must be released by the products in order to convert from the reactants.

9. Cooling a purple solution will turn it pink.

10.  Both are flexible, but one conducts electricity while the other insulates.

11. high pressure, high-temperature water extraction

12. steel + vanadium for shock absorption

13. 15

14. the number of atoms, type of elements, and mass of reactants and products are equal.

15. 64 grams

16. 1.503x10^23

17. The relative numbers of protons and neutrons can differ before and after the change, but the total number of those particles remains the same.

18. The plastic balls are a good representation of neutrons, but there is no splitting of nuclei as happens in fission.

19. beta minus decay

20. alpha decay

21. Greenhouse gases have more than two atoms, allowing them to vibrate and release radiation, warming the atmosphere.

22. cause: acid rain, consequence: destruction of crops

23. toxic bacteria in the water supply

24. it reaches hard to get to oil and gas deposits.

The partial pressure of the gas in a mixture is the pressure that the gas would exert if present alone in the vessel at the same temperature as that of the mixture. Here the partial pressure of Xe is

The pressure exerted by a mixture of two or more non-reacting gases enclosed in a definite volume is equal to the sum of the partial pressures of the component gases.

According to Dalton's law of partial pressures, total pressure is:

P = p₁ + p₂ + ...

2.10 = 0.250 + 0.300 + p

p = 1.55

Partial pressure of Xe = 1.55

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Answer:

17.4 mols

Explanation:

Use the ideal gas Law: Pv=nRt where P is pressure, V is volume, n is the number of mols, R is the Gas constant (0.08206 L*atm/mol*K), and T is the temperature in Kelvin.

Convert temperature to Kelvin: 43.65 C+273= 316.65 K

Pv=nRt -----> Plug in what is given and Solve the equation for n

7.07 atm*64.01 L= n *(0.08206 L*atm/mol*K)* 316.65 K

n= 17.4 mols

A gallon is a common volume measurement unit for measuring liquids and occasionally dry things. 5 gallon is equal to 18.925 L.

Thus, The US liquid gallon, US dry gallon, and Imperial gallon are the three different sorts of gallons. To measure and store commodities like fuel, oil, milk, paint, and many other things, these three types are frequently employed.

The English Parliament created the gallon in 1696 to be used for measuring dry goods. After gaining independence, the US adopted the Winchester gallon, which is now known as the US dry gallon.

Both are now referred to as US liquid gallon and US dry gallon, respectively. On the other hand, the Imperial gallon was adopted by the British Empire in 1834.

Thus, A gallon is a common volume measurement unit for measuring liquids and occasionally dry things. 5 gallon is equal to 18.925 L.

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Detergent enzymes are better because they help limit phosphate pollutants in the environment. Option 3.

Phosphates are a common ingredient in traditional laundry detergents, but they can have harmful effects on the environment.

When phosphate-containing detergents are used, the phosphates can end up in waterways and cause excessive algae growth, leading to decreased oxygen levels in the water and harm to aquatic life.

Enzyme-based detergents can be a more environmentally friendly option as they do not contain phosphates, reducing the amount of phosphate pollution released into the environment.

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Molarity is an important method which is used to calculate the concentration of a solution. The molarity of 0.499 g of NaOH dissolved in 150.00 mL of water is  0.082 M.

Molarity of a solution is defined as the number of moles of the solute present per litre of the solution. The unit of molarity is mol L⁻¹ and it is represented as 'M'.

Molarity = Number of moles of solute / Volume of solution in L

150.00 mL = 0.15 L

Number of moles:

n = 0.499 / 40.00 = 0.0124 moles

M = 0.0124 / 0.15

M = 0.082

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Answer:

Yeah, it's B.

Explanation:

Homeostasis is when the body maintains a near constant internal environment.

The number of mole of Ba₃(PO₄)₂ you can make from 3.54 L of 0.373 M BaCl₂ is 0.44 mole

First, we shall determine the mole in 3.54 L of 0.373 M BaCl₂. Details below:

Molarity = Mole / Volume

Cross multiply

Mole = molarity × volume

Mole of BaCl₂ = 0.373 × 3.54

Mole of BaCl₂ = 1.32 mole

Finally, we can determine the mole of Ba₃(PO₄)₂ produced. Details below:

3BaCl₂ + 2H₃PO₄ -> Ba₃(PO₄)₂ + 6HCl

From the balanced equation above,

3 moles of BaCl₂ reacted to produce 1 mole of Ba₃(PO₄)₂

Therefore,

1.32 mole of BaCl₂ will react to produce = (1.32  × 1) / 3 = 0.44 mole of Ba₃(PO₄)₂

Thus, the number of mole of Ba₃(PO₄)₂ you can make from the reaction  is 0.44 mole

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Answer:

The Correct answer is 15

Answer:

B). 15

Explanation:

The volume in mL of 0.567 M Ca(OH)₂ needed to neutralize 42.8 mL of 0.490 M H₃PO₄ in a titration is 36.98ml.

A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form a salt and water as products.

In a reaction to water, neutralization results in excess hydrogen or hydroxide ions present in the solution. The pH of the neutralized solution depends on the strength of the acid or base involved in it.

Given,

Concentration of calcium hydroxide = 0.567M

Volume of phosphoric acid = 42.8 moles

Concentration of phosphoric acid = 0.49M

During neutralization, the number of moles of acid and base remain same,

                                                 M₁V₁ = M₂ V₂

i.e. Moles of acid = moles of base

        0.49 × 42.8 = 0.567 × V₂

                      V₂ = 36.98 ml

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Answer:

Please mark me brainliest

Explanation:

The answer is false.

opaque materials do not reflect any light because they absorb or trap all light that comes in contact with them. No light is able to return from within an opaque material or reflect off its inner surface. Opaqueness is defined by a lack of light reflection, transmission or scattering. Light either disappears or is converted into other forms of energy within opaque substances.

Please let me know if this helps explain why opaque materials do not reflect light or if any part of the description is unclear. I can also provide any additional examples or details if needed.

Answer: 19) False. A totally opaque material does not let any light pass through it.

The resultant solution has a molarity of 1 M.

To find the molarity of the resulting solution, calculate the total amount of moles of Kool-Aid and the total volume of the solution.

The moles of Kool-Aid in each cup can be calculated as:

moles = concentration (M) × volume (L)

Cup 1: moles = 0.05 L × 0 M = 0 mol

Cup 2: moles = 0.05 L × 2.5 M = 0.125 mol

Cup 3: moles = 0.05 L × 0.5 M = 0.025 mol

The total amount of moles is:

total moles = moles in cup 1 + moles in cup 2 + moles in cup 3

total moles = 0 mol + 0.125 mol + 0.025 mol

total moles = 0.15 mol

The total volume of the solution is:

total volume = volume in cup 1 + volume in cup 2 + volume in cup 3

total volume = 0.05 L + 0.05 L + 0.05 L

total volume = 0.15 L

Now calculate the molarity of the resulting solution:

molarity = total moles ÷ total volume

molarity = 0.15 mol ÷ 0.15 L

molarity = 1 M

Therefore, the molarity of the resulting solution is 1 M.

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If liquid carbon disulfide reacts with 4.5x10²ml of oxygen to produce the gases carbon dioxide and sulfur dioxide. 300mL  is the volume of each product is produced.

A measurement of three-dimensional space is volume. It is frequently expressed quantitatively using SI-derived units, like the cubic metre or litre, or different imperial or US-standard units, including the gallon, quart and cubic inch.

Volume and length (cubed) have a symbiotic relationship. The volume more a container is typically thought of as its capacity, not as the amount of space it takes up. In other words, the volume is the quantity of fluid (liquid or gas) that the container may hold.

CS[tex]_2[/tex] (l) + 3O[tex]_2[/tex] (g) → CO[tex]_2[/tex](g) + 2SO[tex]_2[/tex] (g)

3 moles of oxygen gas form one mole of carbon dioxide

4.50 x 10² mL, or 450. mL

150. mL of CO2 (g)

Since 3 moles of oxygen produce 2 moles of sulfur dioxide,

450. mL×(3/2) =300 mL of SO2 (g).

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If you increase the pressure of the reaction 2A(g) + B(g)C(g) + 2D(g)the reaction will shift forward to the side with little moles of gas.

Le Chatelier's principle states that if pressure is raised, the reaction will favor the direction with a lower number of gas moles.

On this  case, the cleared out side includes a add up to of three gas moles (two moles of A and one mole of B), whereas the correct side covers four gas moles (one mole of C and two moles of D). In this way, the balance will move towards the left-hand side in arrange to diminish the collective gas particles and relieve the rise in weight. The levels of A and B will rise, as the levels of C and D will decrease.

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The total number of atoms in 3.75 mol of ammonium nitrate, NH4NO3, is equal to the Avogadro's number, which is 6.022 x 10^23, times the number of moles, which is 3.75 in this case.

Thus, the total number of atoms in 3.75 mol of ammonium nitrate is equal to 2.26 x 10^24 atoms.

This number can be further broken down into the number of atoms of each element present in the compound. Ammonium nitrate is composed of two elements, nitrogen (N) and hydrogen (H). For each mole of ammonium nitrate, there are 4 moles of hydrogen atoms and 2 moles of nitrogen atoms.

Therefore, in 3.75 moles of ammonium nitrate, there are 15 moles of hydrogen atoms and 7.5 moles of nitrogen atoms, which is equal to 9 x 10^24 hydrogen atoms and 4.05 x 10^24 nitrogen atoms.

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The solubility product of a sparingly soluble salt is defined as the product of molar concentrations of its ions in a saturated solution of it at a given temperature. The two important factors that affect the solubility product are pressure and temperature.

Using an electrical conductivity measurement, determine the ion concentration in a saturated solution and use this number to compute the solubility product.

Using a colorimetric technique, determine the ion concentration in a saturated solution and use this number to compute the Ksp.

It is the pressure which affects the solubility of gases only.

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Answer:

HCI: H has an oxidation number of +1 and Cl has an oxidation number of -1.

NH3: N has an oxidation number of -3 and each H has an oxidation number of +1.

NO3: N has an oxidation number of +5 and each O has an oxidation number of -2.

K₂Cr₂O7: K has an oxidation number of +1, Cr has an oxidation number of +6, and each O has an oxidation number of -2.

Hg₂Cl2: Each Hg has an oxidation number of +1 and each Cl has an oxidation number of -1.

HgCl2: Hg has an oxidation number of +2 and each Cl has an oxidation number of -1.

Al(OH)3: Al has an oxidation number of +3, each O has an oxidation number of -2, and each H has an oxidation number of +1.

Na3PO4: Na has an oxidation number of +1, P has an oxidation number of +5, and each O has an oxidation number of -2.

The compound oxygen difluoride is quite reactive, giving oxygen and HF when treated with water. -126kj is the bond dissociation energy of the O–F bond in OF[tex]_2[/tex].

The amount of energy necessary to homolytically shatter a chemical bond is known as bond dissociation energy. Radical species are often produced by a homolytic fracture. The abbreviations BDE, D0, and DH° are used to denote this energy.

Bond dissociation power is frequently used to gauge a chemical bond's strength as well as for contrasting different bonds. Be aware that the enthalpy change depends on the temperature. Bond dissociation energy is often measured in kJ/mol or kcal/mol.

-318 kJ/mol = BDE for OF[tex]_2[/tex]+ BDE for H[tex]_2[/tex]O - BDE for O[tex]_2[/tex] - 2 x BDE for HF.

Substituting all the values, we get

BDE of O–F bond = -126kj

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Answer:  46.07 °C.

Explanation:

The relationship between a reaction's products and reactants with regard to a certain unit is expressed by the equilibrium constant, K.

Thus, When a reaction is homogeneous, all of the products' and reactions' states of matter are the same (the prefix "homo" means "same"). The solvent typically controls the reaction's overall state of matter.

When a reaction is in chemical equilibrium, the concentrations of the reactants and products do not significantly fluctuate over time. A double arrow between the reactants and products denotes these reversible reactions.

As described, this reaction is endothermic, therefore when heat is added, the equilibrium constant moves to the right.  In turn, this turns the solution blue.  Cl- is drawn out of solution by the addition of AgNO3.

Thus, The relationship between a reaction's products and reactants with regard to a certain unit is expressed by the equilibrium constant, K.

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