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A 0.506 g sample of solid calcium hydroxide was dissolved in some water and then titrated with 28.85 mL of hydrochloric acid to neutralize, then the molarity of HCl is 0.471 M.

Molarity will be calculated by using the below equation as:

M = n/V, where

V = volume of solvent

n is the moles of solute and it will be calculated by using the below equation:

n = W/M, where

W = given mass

M = molar mass

Given chemical reaction is:

Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O

Moles of Ca(OH)₂ = 0.506g / 74.093g/mol = 0.0068 mol

From the stoichiometry of the reaction:

0.0068 moles of Ca(OH)₂ = reacts with 2×0.0068 = 0.0136 moles of HCl

Given volume of HCl = 28.85mL = 0.02885 L

On putting values on the molarity equation, we get

M = 0.0136 / 0.02885 = 0.471 M

Hence required molarity of HCl is 0.471 M.

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Answer:

Scientists discovered that when the locations of earthquakes were plotted on a world map, these locations occurred in a pattern, or variety of patterns.

Explanation:

1129.9 grams of rock salt, NaCl needs to be added to a 3.78 kg of ice, to get the temperature to drop to -19C .

Freezing point depression refers to a property of solutions where addition of a solute lowers the normal freezing point of the solvent.

The Blagden's Law given as the equation above is used to determine the freezing point depression of ice:

where;

For NaCl, i = 2

Kf for water/ice = 1.86 °C kg/mol

molalityof NaCl = (mass/molar mass

l)/kg of ice

molar mass of NaCl = 58.5

mass of ice = 3.78 kg

Let molality of NaCl = m

ΔT = 19 °C

Substituting the values:

19 = 2 x 1.86 °C kg/mol x m

m = 5.11 mol/kg

mass of NaCl = 5.11 × 3.78 × 58.5

mass of NaCl = 1129.9 g

Therefore, the mass in grams of rock salt, NaCl that needs to be added to a 3.78 kg of ice, to get the temperature to drop to -19C is 1129.9 g

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Answer:

D

Explanation:

Took the test!

Gluons act as exchange particles and are known as gauge bosons. They are involved in the forces within the atom as a strong nuclear force that binds the nucleus. Thus, option D is correct.

A strong nuclear force is a type of interaction that is present inside the atom and involves the nucleus. They bind the quarks to make the neutron and the proton, sub-atomic particles.

The strong nuclear force holds the atomic nucleus together and depends on the spin but not the charge. These forces are due to the interaction between the gluons and are stronger than the chemical bonds. The exchange of the mesons results in nucleons that lead to a strong nuclear force.

Therefore, option D. the gluons are responsible for the strong nuclear forces that bind the nucleus.

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Answer:

I think that A is the correct answer might not be

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The purpose of both mitosis and meiosis is to increase the number or population of cells in the body.

Mitosis produces two diploid (2n) cells that are identical to the original parent cell whereas meiosis produces four haploid (n) cells that are different from the original parent cell.

Mitosis occurs in somatic cells whereas meiosis occurs in reproductive cells.

So we can conclude that the purpose of both mitosis and meiosis is to increase the number or population of cells in the body.

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Answer:

contact process, modern industrial method of producing sulfuric acid; it has largely replaced the chamber, or lead-chamber, process. Sulfur dioxide and oxygen, passed over a hot catalyst, unite to form sulfur trioxide, which in turn combines with water to make sulfuric acid.

Answer:When ethanol is oxidised with alkaline potassium permanganate (alkaline KMnO 4) or acidified potassium dichromate (acidified K 2 Cr 2 O 7), ethanoic acid is formed. Alkaline potassium permanganate and acidified potassium dichromate are strong oxidising agents, as they provide oxygen for oxidising other substances in the reaction

Explanation:

Answer:

40.0 c

Explanation:

Answer:

29.09 degree Celsius is final temperature

Answer:

X-rays are a form of electromagnetic radiation, similar to visible light. Unlike light, however, x-rays have higher energy and can pass through most objects, including the body. Medical x-rays are used to generate images of tissues and structures inside the body.

Explanation:

Answer:

b. single displacement

Answer:

0.1077 grams

Explanation:

First we will employ the ideal gas law to determine the number of moles of nitrogen gas.

PV=nRT

P=2 atm

V=20L

R=0.08206*L*atm*mol^-1*K^-1

T=323.15 K

Thus, 2atm*20L=n*0.08206*L*atm*mol^-1*K^-1*323.15K

K, atm, and L cancels out. Thus n=2*20mol/0.08206*323.15=1.5 moles

Lastly, we must convert the number of moles to grams. This can be done by dividing the number of moles by the molar mass of nitrogen gas, which is 14 grams.

1.5/14=0.1077 grams

Answer:

The one with higher specific heat

Explanation:

A metal with the highest specific heat will cause the greatest increase in temperature of water in a calorimeter because the metal would hold more heat, and then transfer it to the water.

Answer:

[tex] \sf \: \fbox{Metal \: with \: the \: higher \: specific \: heat.}[/tex]

Explanation:

HEAT:

In the universe there are only two mods of Transfer of Energy one is Heat and another is Work. That's why Heat and Work are well knowns Path function.

Specific Heat:

The specific Heat of any material is the heat gained or released by the material to raise or fall it's temperature by 1°C per unit mass of the material.

The heat gained or released (Q) is directly proportional to the mass of substance(m) and rise or fall of temp(∆T)

given by the equation,

[tex]\sf \: s = \frac{Q}{m \Delta T} [/tex]

Where S is the proportionality constant also known as specific Heat.

S.I. unit of s is joule/kg-K

C.G.S unit is cal/gm °C.

Specific heat of water: s = 4200 J/kg°C

Coming to the next important term calorimeter,

Calorimeter:

We already knew above that heat is not a form of energy it's a mod of transfer of energy, consider One Energy converted from State A to State B then the total heat(Transferred energy) during the process is measured by a device known as Calorimeter.

Now, coming to your question.

Consider a metal, with lower specific heat (s), the equation we derived above tells that specific heat is directly proportional to energy per unit change in temperature, that means if specific heat will be low, lesser amount of Energy(Heat) will be produced which will cause the minor increase in the temperature.

Which is a contradiction hence the answer would be Metal with the higher specific heat.

This is the final answer!

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Answer:

You gain sodium basically through the food you eat and lose it basically by excretion through urine,sweat

Answer:

H30,+ion is known as Hydroniom Ion

Explanation:

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brainless this answer is correct

Based on the drug dosage provided, cheapest drug for treating headache is Tylenol at a cost of 3.34×10^-23 $/molecule.

A drug dosage is the amount of a drug taken by an individual that produces a therapeutic effect.

The dosage of each drug is given below:

Amount of each drug required by individual is as follows:

Acetaminophen = 240 mg/35 × 130 = 891.43 mg

Ibuprofen = 113 mg/25 × 130= 587.6 mg

Paracetamol = 102mg/15 × 130 = 884 mg

Cost of drug per mg of active ingredient is as follows;

Excedrin =  $15.51/(200 * 250 mg) = 0.0003102 $/mg

Advil = $15/(300 * 200mg) = 0.00025 $/mg

Tylenol = $14.97/(500mg × 225) = 0.000133 $/mg

Cost of each drug for treatment of headache:

Excedrin = 0.0003102 $/mg × 891.43 mg = $0.278

Advil = 0.00025 $/mg × 587.6 mg = $0.147

Tylenol = 0.000133 $/mg × 884 mg = $0.118

Thus, Tylenol is the cheapest drug for treating headache.

Molar mass of paracetamol = 151 g = 151000 g

There are 6.02 × 10^23 molecules in 151000 mg of paracetamol.

Cost per molecule = 0.000133 $/mg × (15000 mg/6.02 × 10^23)

Cost per molecule = 3.34 × 10^-23 $/molecule

Therefore, the cheapest drug for treating headache is Tylenol at a cost of 3.34×10^-23 $/molecule.

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A precipiatate of mass 0.013 g is formed when you mix 75.0 mL of a NaOH solution with pOH of 2.58 and  125.0 mL of a 0.0018 M MgCl2 solution

In stoichiometry, calculations are made based on mass - mole or mole - volume relationships. First we must put down the balanced reaction equation; 2NaOH(aq) + MgCl2(aq) -----> Mg(OH)2(s) + 2NaCl(aq)

Now Ionically;

2OH^-(aq) + Mg^2+(aq)  -----> Mg(OH)2(s)

Concentration of OH^- = Antilog (-2.58) = 2.6 * 10^-3 M

Number of moles of OH^- = 2.6 * 10^-3 M * 75/1000 = 0.000195 moles

Concentration of Mg^2+ = 0.0018 M

Number of moles of Mg^2+ =0.0018 M * 125/1000 = 0.000225 moles

Since;

1 mole of Mg^2+ reacts with 2 moles of  OH^-

x moles of Mg^2+ reacts with 0.000195 moles of  OH^-

x = 0.0000975 moles

Mg^2+  is the limiting reactant.

1 mole of Mg^2+ yields 1 mole of the precipitate

0.000225 moles of Mg^2+ yields 0.000225 moles of precipitate.

Hence, a precipitate is formed.

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When the pressure decreases from left to right, the acceleration also decreases.

This is defined as the rate at which velocity changes with time and it has a direct relationship with pressure.

This however means that when pressure decreases there will be a corresponding decrease in acceleration and vice versa.

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The false statement from the above is that: Temporary charge imbalances in the molecules lead to London dispersion forces.

Generally, the factors which affects the London dispersion forces a dispersion force are as follows:

However, London dispersion forces simply refers to a sort of temporary attractive force formed when electrons in two adjacent atoms occupy positions that make the atoms form dipoles.

So therefore, temporary charge imbalances in the molecules lead to London dispersion forces is a false statement

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Answer:

113 ml

Explanation:

PV = nRT      remember T must be in Kelvin  Volume in L  

270 * .4 =  n 62.4*  338.15

n = .005118

1.4 atm = 1.4 * 760 = 1064 mm

1064 * V = .005118 * 62.4 * 373.15

V = .113 l

Answer: pressure exerted by vapor

Explanation:

Answer:

0.109

Explanation:

0.4-0.291=0.109

Answer:

14.23

Steps given below in the picture

I hope my answer helps you.

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Actually Welcome to the concept of Physical chemistry, and Stochiometry.

So we balance the equation as,

2Na + Cl2 ===> 2NaCl

The required reaction is as:

2Na+ Cl2 = 2NaCl

2 moles Na = 2×23 g = 46g,1 mole Cl2 = 2×35.5g=71g

Now,71g Cl2 reacts with 46g Na,

Therefore, 67.2g Cl2 reacts with 46×67.2/71= 43.54g Name

The rest Na = (55–43.54)g=11.46g

That means Cl2 is a limiting reactant.

Again,2 moles NaCl=2(23+35.5)g=117g

Then,71g Cl2 produce 117g NaCl

Therefore,67.2g Cl2 produce 117×67.2/71 = 110.74g NaCl

hence the correct option is, b.) 111 g NaCl

No of molecules

Note that

Answer:

One gram of carbon dioxide contains 13.6 x 10²¹ number of molecules.

Explanation:

Answer:

1.50 moles

Explanation:

use dinemential analysis

find the molar mass

The compound name for the compound structure given in the question is 2, 3-dimethlypentane

The international union of pure and applied chemistry (IUPAC) has organised a principle by which organic compounds are named. This principle includes:

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