you weigh out a 0.282 gram piece of metal and combine it with 60.6 ml of 1.00 m hcl in a coffee-cup calorimeter. if the molar mass of the metal is 56.21 g/mol, and you measure that the reaction absorbed 111 j of heat, what is the enthalpy of this reaction in kj per mole of limiting reactant?

An atom Y has atomic number 13, so the no. of electrons and protons in it is 13 and after loses it will form cation and no. of electrons will become 10.

Atomic number of an atom is equal to the number of electrons or protons present in that atom.

Number of protons and electrons in the atom before loses electron is 13, as given atomic number is 13.

Number of elctrons in the atom is 10 and number of protons is 13, as protons are present in the nucleus.

So, number of protons is always same i.e. 13 within the atom and no. of electrons after losing 3 electrons is 10.

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The compound that is a strong electrolyte among the given options is c. KOH (potassium hydroxide). An electrolyte is a substance that dissociates into ions when dissolved in water, enabling it to conduct electricity.

Strong electrolytes dissociate completely into ions, while weak electrolytes partially dissociate. Water (H2O) is a polar molecule but does not dissociate significantly into ions, making it a weak electrolyte. Ethanol (CH3CH2OH) is a covalent compound and does not dissociate into ions when dissolved in water, making it a non-electrolyte.

KOH (potassium hydroxide) is a strong base and dissociates completely into K+ and OH- ions when dissolved in water, making it a strong electrolyte. CH3COOH (acetic acid) is a weak acid and partially dissociates into H+ and CH3COO- ions when dissolved in water, making it a weak electrolyte. Therefore, the correct answer is c. KOH.

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Among the compounds given, KOH (potassium hydroxide) is a strong electrolyte because it completely ionises into K+ and OH- ions when dissolved in water.

The question is asking which among the given compounds is a strong electrolyte. An electrolyte is a substance that dissociates into ions when dissolved in water, and the degree to which it dissociates determines whether it is a strong or weak electrolyte.

Considering the options:
a. H2O (water) is not an electrolyte
b. CH3CH2OH (ethanol) is a weak electrolyte as alcohol molecules only slightly ionises in water
c. KOH (potassium hydroxide) is a strong electrolyte as it completely ionises into K+ and OH- ions when dissolved in water.
d. CH3COOH (acetic acid) is a weak electrolyte as it does not fully ionise in water.

Therefore, KOH is the strong electrolyte among the given compounds.

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Answer:

CH3CH2CH2CH3

Explanation:

The boiling point of a compound depends on the nature of intermolecular interaction between the molecules of the compound.

If a molecule is nonpolar and has a low molecular mass, then its molecules are most likely held together only by weak intermolecular bonds such as dispersion forces. These forces are easily broken and the molecules move apart hence the molecule possess a low boiling point.

Polar molecules and molecules having higher molecular mass tend to have higher boiling points.

Among all the compounds listed, CH3CH2CH2CH3 is non polar and has the lowest molecular mass hence it exhibits the least boiling point.

Answer:

Gold

Hope it helps

have a good day

Answer:

This is an example of Avogadro equation

But why is love so important? Scientific studies have shown that being in love causes our body to release feel-good hormones and neuro-chemicals that trigger specific, positive reactions. We love our children, relatives and friends, and want to be with them, and that makes our lives more meaningful.

(a) The principal organic product of the reaction between cyclopentyllithium and formaldehyde in diethyl ether, followed by dilute acid, is 2-methylcyclopentan-1-ol.

(b) The principal organic product of the reaction between tert-butylmagnesium bromide and benzaldehyde in diethyl ether, followed by dilute acid, is 1-phenyl-1,1-dimethylethanol.

(c) The principal organic product of the reaction between lithium phenylacetylide and cycloheptanone in diethyl ether, followed by dilute acid, is 1-phenyl-1-cycloheptanol.

(a) The principal organic product of the reaction between cyclopentyllithium and formaldehyde in diethyl ether, followed by dilute acid, is 2-methylcyclopentan-1-ol. The reaction involves the addition of the nucleophilic cyclopentyllithium to the carbonyl group of formaldehyde, followed by protonation of the resulting alkoxide intermediate.

(b) The principal organic product of the reaction between tert-butylmagnesium bromide and benzaldehyde in diethyl ether, followed by dilute acid, is 1-phenyl-1,1-dimethylethanol. The reaction involves the addition of the nucleophilic tert-butylmagnesium bromide to the carbonyl group of benzaldehyde, followed by protonation of the resulting alkoxide intermediate.

(c) The principal organic product of the reaction between lithium phenylacetylide (CHC≡CLi) and cycloheptanone in diethyl ether, followed by dilute acid, is 1-phenyl-1-cycloheptanol. The reaction involves the addition of the nucleophilic lithium phenylacetylide to the carbonyl group of cycloheptanone, followed by protonation of the resulting alkoxide intermediate.

The question is incomplete and the completed question is given as,

Given the reactants in the preceding problem, write the structure of the principal organic product of each of the following. (a) Cyclopentyllithium with formaldehyde in diethyl ether, followed by dilute acid. (b) tert-Butylmagnesium bromide with benzaldehyde in diethyl ether, followed by dilute acid. (c) Lithium phenylacetylide (CH,C=CLI) with cycloheptanone in diethyl ether, followed by dilute acid.

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Answer: 8

Explanation: k*4O=2*4O=8O

Answer: 40

Explanation: On your periodic table the number above the element(the number is still inside the box) is the atomic number. It is also the protons for that element. This applies to every element

Dose of gamma radiation: e. Independent variable

The production rate of amino acids: c. Dependent variable

Sealing the solution in glass tubes: d. Level of treatment

Ammonia and formaldehyde: b. Control treatment

Ammonia and formaldehyde are used as a control treatment in the experiment. A control treatment is a condition or treatment that is used as a reference or a standard against which the results of the experiment can be compared.

The independent variable was the dose of gamma radiation, and the dependent variable was the production rate of amino acids. The level of treatment was sealing the solution in glass tubes, and the control treatment was ammonia and formaldehyde.

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Answer:

378mL

Explanation:

The following data were obtained from the question:

Pressure (P) = 99.19 kPa

Temperature (T) = 28°C

Number of mole (n) = 0.015 mole

Volume (V) =...?

Next, we shall convert the pressure and temperature to appropriate units. This is illustrated below:

For Pressure:

101.325 KPa = 1 atm

Therefore, 99.19 kPa = 99.19/101.325 = 0.98 atm

For Temperature:

T(K) = T(°C) + 273

T(°C) = 28°C

T(K) = 28°C + 273 = 301K.

Next we shall determine the volume of N2. The volume of N2 can be obtained by using the ideal gas equation as shown below:

PV = nRT

Pressure (P) = 0.98 atm

Temperature (T) = 301K

Number of mole (n) = 0.015 mole

Gas constant (R) = 0.0821atm.L/Kmol.

Volume (V) =...?

0.98 x V = 0.015 x 0.0821 x 301

Divide both side by 0.98

V = (0.015 x 0.0821 x 301) /0.98

V = 0.378 L

Finally, we shall convert 0.378 L to millilitres (mL). This is illustrated below:

1L = 1000mL

Therefore, 0.378L = 0.378 x 1000 = 378mL

Therefore, the volume of N2 collected is 378mL

Answer:

While the Affordable Care Act (ACA) has made health insurance more affordable for ... for the majority of Americans who have coverage through employer-based plans. ... Why Average Americans Cannot Afford Health Care ... Almost half of our nation's income goes to the top 10 percent of the population.

Explanation:

Here are three ideas based on affordability:

Public transportation

Meal planning and cooking at home

Renting textbooks

Public transportation: Using public transportation such as buses and trains can be a more affordable option compared to owning and maintaining a personal vehicle.

Meal planning and cooking at home: Eating out at restaurants or buying pre-made meals can be expensive, especially if done frequently. Planning meals ahead of time and cooking at home can be a more affordable option.

Renting textbooks: Instead of purchasing new textbooks for each class, consider renting textbooks for the duration of the semester. This can be a more affordable option than buying new textbooks, especially if the textbooks are only needed for a short period.

These ideas are generally less expensive because they involve reducing unnecessary expenses and finding more affordable alternatives. By using public transportation instead of owning a car, you can save on the cost of purchasing and maintaining a vehicle.

Similarly, by cooking at home and renting textbooks, you can avoid the cost of eating out at restaurants and buying new textbooks.

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Explanation:

Atoms in the equation are already in balance.

Answer:

it is d, got it right on EDG

Explanation:

2. 2Al(s) + 6HCl(aq) + 2AlCl3(aq) + 3H2(g) represents a single replacement reaction

A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds

Not all of these reactions can occur. We can use the activity series(voltaic series), which is a list of elements that can replace other elements below / to the right of them in a single replacement reaction.

1. 2Al(s) + 3Cl2(g) → 2AlCl3(s)

Syntesis/combination reaction

2. 2Al(s) + 6HCl(aq) ⇒2AlCl3(aq) + 3H2(g)

Single replacement reaction

3. 2AlCl3(s) → 2Al(s) + Cl2(g)

Decomposition reaction

4. AlCl3(aq) + 3KOH(aq) + Al(OH)3(s) + 3KCl(aq)

Double  replacement reaction

In a single replacement reaction, one element replaces another one. The reaction that shows the single replacement reaction is:

\(\bold { 2Al(s) + 6HCl(aq) \rightarrow 2AlCl_3(aq) + 3H_2(g)}\)

\(\bold { 2Al(s) + 6HCl(aq) \rightarrow 2AlCl_3(aq) + 3H_2(g)}\)

In the given reaction, aluminum replaces the hydrogen from hydrochloric acid to form Aluminum chloride.

Therefore, the reaction that shows the single replacement reaction is:

\(\bold { 2Al(s) + 6HCl(aq) \rightarrow 2AlCl_3(aq) + 3H_2(g)}\)

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The molar mass is 53.56 g/mol.

The molar mass of a substance is the mass of the substance which contains one mole of a substance.

Given data:

Given volume of flask = V = 247.3 mL = 0.2473 L

Temperature = T = 100 = 373 K

Pressure of the gas = P = 745 mmHg  = 0.9802 atm

Mass of acetone = 0.424 g

R= 0.0821 L.atm \(mol^-^1\)\(K^-^1\)

Assuming the molar mass of acetone to be M g/mol

The ideal gas equation is shown below:

PV=nRT

\(PV=\frac{mass}{M} RT\)

Putting all the above data.

M= 53.56 g/mol

Hence, the molar mass is 53.56 g/mol.

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Answer:

I'm pretty sure it's A

Explanation:

Answer:

for the  a p e x  quiz:

it dissociates completely in solution.

Explanation:

a p e x

Answer:

72 Newton

Explanation:

force=mass x acceleration due to gravity

Force applied on object is 72 Newton​

Given that;

mass of thing = 6 kg

Acceleration = 12 m/s²

Find:

Force applied on object

Computation:

Force = mass × acceleration

Force applied on object = 6 × 12

Force applied on object = 72 Newton​

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The question requires us to calculate the volume of hydrogen gas in a balloon, given the number of moles of hydrogen, temperature and pressure in the balloon.

We can collect the following information from the question:

number of moles of H2 = n = 0.24 mol

temperature = T = 35°C

pressure = P = 1.05 atm

Since we need to calculate the volume of a gas and the temperature and pressure given are not the under the STP (Standard Temperature and Pressure), we'll need to apply the Ideal Gas Law equation:

Rearranging the equation above to find volume (V), we have:

where n is the number of moles of hydrogen gas, T and P are the temperature and pressure given, and R is a the constant of gases (R = 0.0821 L.atm/mol.K)

Note that we need to use the units following the constant of gases - L for volume, atm for pressure, mol for number of moles and K for temperature. Thus, we need to convert the temperature given (35°C) into Kelvin degrees:

T = 35 + 273.15 = 308.15 K

Now that we have all required variables to calculate the volume, we replace them in the equation:

Therefore, the volume of hydrogen in the ballon, under the given temperature and pressure, is 5.78 L.

As the question requires the answer expressed with two signifcant figures, we can write that the volume of hydrogen is 5.8 L.

the volume of hydrogen is 5.8 L

The order of the reaction with respect to nitrate ion is 2.3. The activation energy for this reaction is Ea = 148 kJ/mol.

1. The basic form of rate law for the given reaction is as follows:

\(Rate = k [NO3-][I-]^3[H+]^22\).

Given: doubling the concentration of nitrate ion causes the rate of reaction to quadruple.The order of reaction with respect to nitrate ion can be calculated using the formula;

\(k2/k1 = (2^n)\)

where,n is the order of reaction with respect to nitrate ion k1 and k2 are rate constants of reaction at the respective concentrations of nitrate ion.Substituting the values given in the question;

\(4 = (2^n)\)

The value of n can be obtained by solving the equation.

n = 2

Therefore, the order of the reaction with respect to nitrate ion is 2.3.

We can use the Arrhenius equation to calculate the activation energy of the reaction.

\(k = Ae^{(-Ea/RT)}ln\)

\(k = ln A - (Ea/RT)\)

Taking the natural logarithm of both sides of the Arrhenius equation will give the equation of the line in the form y = mx + b,

where y = ln k, x = 1/T, m = -Ea/R, and b = ln A.

The slope of the straight line is -Ea/R.

Therefore,-6114 = (-Ea/R)

Solving for Ea,

Ea = 148 kJ/mol

The activation energy for this reaction is Ea = 148 kJ/mol.

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Explanation:

solute is the substance being dissolved so that is the 2 tablespoons of lemonade and the 2 cups of water is the solvent.

The values of x and y are 0.73 cm3 and 0.27 cm3. The masses are obtained by multiplying these values by the densities giving us with 6.54 g and 3.06 g.

First, from reliable sources we get the densities of both the copper and lead. This will give us 8.96 g/cm3 and that of lead is 11.34 g/cm3. We assume that 1 cm3 of this certain mixture is composed of x cm3 of copper and y cm3 of zinc. Such that,

x + y = 1

and 9.60 = x(8.96) + y(11.34)

The values of x and y are 0.73 cm3 and 0.27 cm3. The masses are obtained by multiplying these values by the densities giving us with 6.54 g and 3.06 g.

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*sorry I can't give a full explanation.*

g = 9.8 m/s²

w = m*g

Weight of cat: 55 N = m*9.8

m = 5.61 kg

Weight of dog: 110 N = m*9.8

m = 11.22 kg

There is gravitational potential energy (GPE) acting on the cat since it's at the very top.

GPE of cat = m*g*h = 5.61*9.8*2 = 109.96 J

GPE of dog = m*g*h = 11.22*9.8*0 = 0 J (it's 0 m height because it's on the floor instead of in the tree)

But, if the dog was also 2 m up in the tree, its GPE would be 219.91 J.

As you can see, it's GRAVITATIONAL potential energy is bigger than the cat because it weighs more. Generally, if you were just trying to find the force which is w = m*g (since weight is a force), you would see that the bigger the mass, the bigger the force, and gravity stays the same.

Hope this helped

Answer:

Biochemistry is the discipline that studies the chemistry of life, and its objective is to explain form and function based on chemical principles. Organic chemistry is the discipline devoted to the study of carbon-based chemistry, which is the foundation for the study of biomolecules and the discipline of biochemistry. Both biochemistry and organic chemistry are based on the concepts of general chemistry, some of which are presented in Fundamentals of Physics and Chemistry Important to Microbiology.

Explanation:

Answer:

Explanation:

Find the answer below

Answer:

a. 87.33 g

b. 2.30 g

Explanation:

1 mole of LiCl has 42.394 g

=> 2.060 x 42.394 = 87.33164 g or 87.33 g

1 mole of C2H2 has 26.04 g

=> 0.0885 x 26.04 = 2.30454 g or 2.30 g

Answer:

An energy pyramid shows the flow of energy at each trophic level in an ecosystem. A pyramid shape is used because energy is lost at each trophic level when organisms use it up.

Explanation:

The final composition of the resulting solution of 10^-2 M NH4Cl and NaHS will have a pH of 9.36.

We are given the concentration of NH4Cl and NaHS as 10^-2 M.The ammonium ion (NH4+) will undergo hydrolysis in water and form NH3 and H+.NH4+ + H2O ⇌ NH3 + H+ (acid-base reaction)The reaction shows that the ammonium ion is an acid and will produce hydrogen ions in an aqueous solution.On the other hand, sodium hydrogen sulfide (NaHS) is a weak base and undergoes hydrolysis in an aqueous solution.NaHS + H2O ⇌ NaOH + H2SThe equation shows that hydrogen sulfide (HS-) is a weak acid and will produce hydroxide ions in an aqueous solution.The hydrolysis reactions of the two salts lead to an increase in hydroxide ions (OH-) in the solution, leading to a basic solution.

We can calculate the pH of the solution using the Kb values of NaHS and the Ka value of NH4+.NH4+ + H2O ⇌ NH3 + H+Ka = [NH3][H+]/[NH4+]Kb = [HS-][OH-]/[NaHS]We can assume the concentrations of NH3 and HS- to be the same, let's assume it is x, then the equilibrium constant can be expressed as:Kw = Ka × Kb[H+][OH-] = Ka × Kb[H+][OH-] = (1.8 × 10^-5) × (1.2 × 10^-13) = 2.16 × 10^-18pH + pOH = 14pH + pOH = 14pH = 14 - pOHpOH = -log[OH-] = -log(1.47 × 10^-8) = 7.83pH = 14 - 7.83 = 6.17We can conclude that the pH of the resulting solution will be 9.36 and the final composition of the resulting solution of 10^-2 M NH4Cl and NaHS will be basic.

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Answer: 0.048 kPa

Explanation: no clue i just looked it up you’re welcome y’all:)