Radioactive decay of Mg, by graphical method prove that this is a first-order reaction

The number of CaSO4 molecules in 2.9 moles is 17.458 x 10^23.

Avogadro's number or Avogadro's constant refers to the quantity of units contained in one mole of any substance. The value is 6.0221408571023. Depending on the nature of the reaction and the substance, the units may be electrons, ions, atoms, or molecules.

Number of moles X Avogadro’s number => Number of molecules

number of CaSO4 molecules => 2.9 x 6.02 x 10^23

                                                  => 17.458 x 10^23 molecules.

The amount of atoms, molecules, or other particles that make up one mole of a substance is known as Avogadro's Number. One mole of hydrogen, for instance, is represented by 6.022 x 1023 hydrogen atoms.

Thus, the mole and the number 6.022 1023 mol1 were invented by Avogadro, Horstmann introduced the idea of the mole into science/chemistry, and Loschmidt and Than were the researchers who first determined Avogadro's number.

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The volume of the gas decreases as it is cooled, while maintaining a constant pressure.

What is pressure?

Pressure is defined as the force exerted per unit area. It is a scalar quantity and is measured in units of force per unit area, such as pascals (Pa) or pounds per square inch (psi). Pressure can be exerted by a gas, liquid, or solid on a surface, and it can be exerted in any direction. It is the ratio of force to the area over which that force is distributed. This means that a small force exerted over a large area will have the same pressure as a larger force exerted over a smaller area.

When an ideal gas is cooled from 100°C to -43°C at a constant pressure, the temperature decreases and the volume of the gas decreases. This is because the gas molecules lose energy and move slower, which means they take up less space.

The ideal gas law, PV = nRT, states that the product of pressure and volume is directly proportional to the number of moles of gas and the absolute temperature. As the temperature decreases and the pressure remains constant, the volume of the gas decreases.

The other statements are not true:

-The number of moles of gas decreases as it is cooled.

-The pressure of the gas decreases as it is cooled.

-The number of gas molecules decreases as it is cooled.

As long as the volume is kept constant and the temperature is lowered, the pressure of the gas decreases.

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Answer:

the boiling point of solution at 3 decimal point is 100.329०C Ans.

Explanation:

given data -

molality of Nacl = 0.321 m

molal boiling point elevation constant (Kb) =0.512०C/m

# formula of change of boiling point of sample =

∆ Tb =i × Kb × m

Kb = molal boiling point of elevation constant

m = molality

i = vont's hoff factor.

Nacl is strong electrolyte and its 100% dissociate so the value of i for Nacl is 2

put value in the formula

∆ Tb = 2 × 0.512 ०C/m × 0.321m

= 0.3287

= 0.329०C

∆Tb = T'b - Tb

T'b = boiling point of solution

Tb= boiling point of solvent( water)

0.329०C = T'b - 100०c ( boiling point of water = 100०C)

T'b = 0.329०C + 100०C

= 100.329०C

hope this helps

Answer:

a. 480 kilojoules

Explanation:

good luck have a nice day

Answer:

The inner core is solid, the outer core is liquid, and the mantle is solid/plastic. This is due to the relative melting points of the different layers (nickel–iron core, silicate crust and mantle) and the increase in temperature and pressure as depth increases.

Explanation:

The centrifuge is an instrument which is mainly used in research and clinical laboratories. All the given equipment are used in laboratories. But Centrifuge is not a common piece of lab equipment. The correct option is B.

The laboratory equipment is mainly used to perform experiments and to take measurements and to collect data. The most common laboratory equipment includes Bunsen burners, burettes, pipette, microscope, calorimeters, etc.

A centrifuge is a system which is used to separate the components of a liquid using centrifugal force. It is not a common laboratory equipment.

Thus the correct option is B.

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The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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The activation energy of the reaction is the difference between the highest point on the reaction profile and the energy of the reactants.

A potential energy diagram or a reaction profile shows us the energ change between the reactants and the products.

As we look at the reaction profile, we observe that the products have a greater energy than the reactants hence the reaction is endothermic. The enthalpy chamgeis obtained by subtracting the energy of the products from the energy of the reactants.

The activation energy of the reaction is the difference between the highest point on the reaction profile and the energy of the reactants.

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The change in internal energy of the gas in the cylinder is +5000.84989kJ.

Energy is described as the quantitative property that is transferred to a body or to a physical system or simply the ability to do work.

The given parameters include:

q = +5001J (gained is +)

P =  750Torr ( 1atm /760 (Torr) = 0.987atm

w = −PΔV

w = −0.987atm(1.846L − 0.345L)

w = −1.481L • atm (101.325J/1atm)

w = −150.11J = −0.15011kJ

we know that

ΔU = w + q

ΔU = 5001kJ − 0.15011kJ = +5000.84989kJ (The positive sign denotes that system increased in internal energy)

The first law of thermodynamics dealt on energy and explained that

Energy is conserved and under normal circumstances, the total amount of energy is constant. It is difficult to measure total energy within a system because there are so many different forms of energy, but we can measure energy changes.

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If number of bonds is three (3) then bond angle is 120° and structure is trigonal and if number of bonds is four( 4) then bond angle will be 109° 28' and structure is tetrahedral.

The angle between two bonds in a complex molecule or between two orbitals that include bonding electron pairs encircling the core atom is the bond angle. It is calculated and represented in degrees using a spectroscopic method.

When a single electron pair there at central atom begins to resist the bound pair of electrons, the bond angle decreases and the bonds are slightly shifted inward. When there is a increase in back bonding, the bond angle increases.

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Answer:

Divide the mass of the water lost by the mass of hydrate and multiply by 100. The theoretical (actual) percent hydration (percent water) can be calculated from the formula of the hydrate by dividing the mass of water in one mole of the hydrate by the molar mass of the hydrate and multiplying by 100.

Answer:

A.

1. a. 11.28L O2

b. 24.3L O2

c. 19.83L O2

2. a. 5.6 grams CaCl2

3. a. 2Mg + O2 = 2MgO

b. 8.06 grams MgO

c. 8.06 grams MgO

d. 8.06 grams MgO

e. 100%

4. a. 2Na + Br2 = 2NaBr

b. Excess reagent: Bromine; 0.5 moles

c. 10.6 grams NaBr

Answer: 212

Explanation:

Answer:

Reflecting telescopes take up less space, is the suitable answer.

Answer:

B, or 2: Reflecting telescopes produce clearer images.

Explanation:

Took the test

Answer:

\(t=9.7s\)

Explanation:

Hello,

In this case, we have a second order kinetics given the second power of the concentration of chlorine (V) oxide in the rate expression, thus, the integrated equation for the concentration decay is:

\(\frac{1}{[Cl_2O_5]}=kt+\frac{1}{[Cl_2O_5]_0}\)

Thus, the final concentration for a 94% decrease is:

\([Cl_2O_5]=0.600M-0.600M*0.94=0.036M\)

Therefore, we compute the time for such decrease:

\(kt=\frac{1}{[Cl_2O_5]}-\frac{1}{[Cl_2O_5]_0}=\frac{1}{0.036M}-\frac{1}{0.60M} =26.1M^{-1}\)

\(t=\frac{26.1M^{-1}}{k}= \frac{26.1M^{-1}}{2.7M^{-1}*s^{-1}}\\\\t=9.7s\)

Regards.

Based on the balanced chemical equation, the theoretical yield of MgO is equal to the amount of Mg used in the reaction.

In this lab, we used stoichiometry to determine the theoretical yield of MgO that could be produced from a given amount of Mg.

If a company is producing MgO with the same cost of materials as in this lab and is averaging a 92 percent yield, we can compare the actual yield of MgO they are producing to the theoretical yield we calculated in this lab to determine if their process is efficient.

Let's say the company uses 10 grams of Mg in their production process. Based on our calculations from the lab, the theoretical yield of MgO would be 13.12 grams. If the company is averaging a 92 percent yield, this means they are producing:

0.92 x  13.12 = 12.06 grams of MgO.

To determine if the company should continue their process or update, we need to compare the actual yield of MgO they are producing (12.06 grams) to the theoretical yield we calculated in the lab (13.12 grams). The actual yield is about 92% of the theoretical yield, which is close but slightly lower.

If the company can improve their process to increase the yield closer to the theoretical yield, they may be able to produce more MgO with the same amount of Mg and cost of materials. However, if the cost of updating the process exceeds the potential benefits of increasing the yield, it may not be worth it for the company to update their process.

In summary, based on the information provided, I would recommend that the company continue their process but consider ways to improve their yield if possible. It would also be important to consider the costs and benefits of updating their process before making any changes.

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71. The broad, painless, pink-gray, wart-like infectious lesions that may develop on the vulva, perineum, or anus in syphilis are called "condyloma lata."

72. In suspected syphilis infection, the term RPR stands for "Rapid Plasma Reagin." It is a blood test used to screen for syphilis.

73. The recommended dosage of Benzathine Penicillin in an adult in Zambia may vary depending on the stage and severity of the syphilis infection. It is best to consult local guidelines or a healthcare professional for the specific recommended dosage in Zambia.

74. The recommended drug for the treatment of gonorrhea when using syndromic management may vary depending on local guidelines and antibiotic resistance patterns. Commonly used antibiotics include ceftriaxone in combination with azithromycin or doxycycline.

75. The causative organism for chancroid is called "Haemophilus ducreyi."

76. The commonest type of HIV is "HIV-1."

77. The assertive, problem-solving approach to the identification and treatment of the patient's problems is called "clinical decision-making."

78. A tumor arising from the cells producing melanin is also known as "melanoma."

79. The type of sound described as drum-like, loud, and empty quality felt over a gas-filled stomach, intestine, or pneumothorax during percussion is called "tympany."

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Answer:

Hmmmm

Explanation:

Hard,

Rough,

Dusty.

Answer:

This matter is a solid because it has a definite shape and volume and are tightly packed together.

Hope this helps!! <3

Answer:

No, We cannot change a gravitational field directly. Gravity is due or caused by the energy in objects with mass. ... Either way, once a particle, it is an object thus a source of gravitational potential.

Hope it helps,

Please mark me as the brainliest

Thank you

there are no current practical outer space applications of artificial gravity for humans due to concerns about the size and cost of a spacecraft necessary to produce a useful centripetal force comparable to the gravitational field strength on Earth.

Answer:

El pepe

Explanation:

ete sech xd uwu o ni chan

Answer : The net ionic equation will be,

\(Ba^{2+}(aq)+SO_4^{2-}(aq)\rightarrow BaSO_4(s)\)

Explanation :

In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

The given balanced ionic equation will be,

\(Ba(OH)_2(aq)+H_2SO_4(aq)\rightarrow 2H_2O(aq)+BaSO_4(s)\)

The ionic equation in separated aqueous solution will be,

\(Ba^{2+}(aq)+2OH^-(aq)+2H^{+}(aq)+SO_4^{2-}(aq)\rightarrow BaSO_4(s)+2H^+(aq)+2OH^{-}(aq)\)

In this equation, \(H^+\text{ and }OH^-\) are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

\(Ba^{2+}(aq)+SO_4^{2-}(aq)\rightarrow BaSO_4(s)\)

The average atomic mass of the element is 12.0107 amu.

To calculate the average atomic mass of the element in question, we can use the following formula:

average atomic mass = (mass of isotope 1 x abundance of isotope 1) + (mass of isotope 2 x abundance of isotope 2)

where "mass of isotope 1" is the mass of the first stable isotope (13 amu in this case), "abundance of isotope 1" is the percentage of that isotope in the element (1.07% in this case), "mass of isotope 2" is the mass of the second stable isotope (12 amu in this case), and "abundance of isotope 2" is the percentage of that isotope in the element (98.93% in this case).

Substituting the given values in the formula, we get:

average atomic mass = (13 amu x 1.07%) + (12 amu x 98.93%)

average atomic mass = (0.1391 amu) + (11.8716 amu)

average atomic mass = 12.0107 amu

Therefore, the average atomic mass of the element is 12.0107 amu.

This means that on average, one atom of this element weighs 12.0107 atomic mass units (amu), which is slightly heavier than the most abundant isotope (12 amu) due to the presence of the less abundant isotope (13 amu). This concept is important in chemistry because the mass of atoms plays a crucial role in determining their chemical and physical properties. The knowledge of the average atomic mass of an element is important in a wide range of applications, including analytical chemistry, geochemistry, and nuclear physics.

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Answer:

A

Explanation:

Answer:

Homogeneous mixture.

Explanation:

On mixing with water, it dissolves completely in it, hence, being a homogenous mixture.

Hope it helps.

Answer:

Fresh milk has several chemical properties. It is a good source of nutrients such as carbohydrates, proteins, and fats, as well as vitamins and minerals. It is also a source of enzymes and hormones. One important enzyme found in fresh milk is lactase, which helps to digest lactose, a type of sugar found in milk. Fresh milk also contains lactic acid, which gives it a slightly sour taste. It also has a pH of around 6.5-6.7, which is slightly acidic. Milk also contains a number of antimicrobial agents, such as lactoferrin and lysozyme, which help to protect against the growth of harmful bacteria.

Explanation:BRAINLIEST PLS

Answer:

0.34 x 0.568 = [0.19312]

Explanation:

just multiply it

Answer: 0.19

Explanation: 0.34 x 0.568 = 0.19312. this answer does not have the correct amount of significant figures though, so you have to round. 0.568 has 3 significant figures, and 0.34 has 2 significant figures. you always want to round to the smaller amount of significant figures, which is two in this case. 0.19312 rounds down to 0.19.

Answer: 21 lawns per week

Explanation:

The average weekly rate refers to how many lawns were mowed per week given that 233 were done in 11 weeks.

Rate will be given by;

= Lawns mowed / Weeks taken

= 233 / 11

= 21 lawns per week