How much heat is required to change temperature of 10g of water from 4°C to 8°C? (Water has a specific heat of 4.18)?
0 J 167.2 J 165.4 J 160.2 J

Explanation:

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use dimensional analysis and set up your equation like so:

[tex]=220g\ x\ \frac{cm^3}{55g}[/tex]

the unit grams would cancel which leaves the unit of cm³, which is the unit for volume in this case.

The volume of 220g of an object with a density of 55g/cm³ is 4 cm³.

Enthalpy change is the difference between energy used and energy gained. The change in enthalpy of the liquid mercury is 0.0231 kJ.

Enthalpy change is the difference between the energy used to break chemical bonds and the energy gained by the products formed in a chemical reaction.

The enthalpy change is given by,

[tex]\rm \Delta H_{rxn} = \rm q_{rxn}[/tex]

and,

[tex]\rm q = mc\Delta T[/tex]

Given,

Mass of the liquid mercury (m) = 11.0 gm

The specific heat of mercury (c) = 0.14 J per g per degree Celsius

Temperature change = 15 degrees Celsius

Enthalpy change is calculated as:

[tex]\begin{aligned} \rm q &= \rm mc\Delta T\\\\&= 11 \times 0.14 \times 15\\\\&= 23.1 \;\rm J\end{aligned}[/tex]

Therefore, 0.0231 kJ is the change in enthalpy.

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The answer is 285.33g nitrogen would be completely consumed in the reaction with 30.80 g of hydrogen gas.

A mole is defined as 6.02214076 × 10²³ atoms, molecules, ions, or other chemical units.

Write a balanced equation.

Calculate the moles of H₂ in 30.8 g.

Calculate the moles of N₂ required to react with H₂.

Calculate the mass of N₂.

Calculate the initial mass of N₂.

Start with a balanced equation.

N₂ + 3H₂ --> 2NH₃

Calculate the moles of H₂ in 30.8 g.

n = m/M; where n = moles, m = mass, and M = molar mass.

M(H₂) = 1.008 g/mol

n(H₂) = (30.8 g)/(1.008 g/mol) = 30.56 mol H₂

Calculate the moles of N₂ required to react with 30.56 mol H₂ , using the mole ratio between H₂ and N₂ in the balanced equation.

30.56 mol H₂ × 1 mol N₂/3 mol H₂ = 10.18 mol N₂

Calculate the mass of N₂ in 10.18 mol.

m = n × M

M(N₂) = 2 × 14.007 g/mol N = 28.014 g/mol N₂

m(N₂) = 10.18 mol × 28.014 g/mol = 285.33g N₂

Therefore 285.33g nitrogen would be completely consumed in the reaction with 30.80 g of hydrogen gas.

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In acidic solution, [H₃O ] > [OH⁻]. The correct option is C.

Hydronium ion is the simplest form of oxonium ion, and it is derived from the protonation of water. It is produced by dissolving the Arrhenius acid in water.

Hydroxide ion is a diatomic anion formed with oxygen and hydrogen with single covalent bond.

The concentration of hydronium ions in an acidic aqueous solution will be higher than the concentration of hydroxide (OH-) ions.

Thus, the correct option is C, [H₃O ] > [OH⁻].

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The pressure of the tyre after the temperature change is 0.89atm. Details about pressure can be found below.

The pressure of the tyre can be calculated using the following equation:

P1/T1 = P2/T2

Where;

According to this question, a tyre at 21°C (294K) has a pressure of 0.82 atm. Its temperature decreases to –3.5°C (269.5K).

0.82 × 294 = P2 × 269.5

241.08 = 269.5P2

P2 = 241.08 ÷ 269.5

P2 = 0.895atm

Therefore, the pressure of the tyre after the temperature change is 0.89atm.

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Answer: 0.75 atm

Explanation: just did test on edge

The number of mole present in 0.116 grams of barium sulphate, BaSO₄ is 0.0005 mole

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

From the question given above, the following data were obtained:

Mole = mass / molar mass

Mole of BaSO₄ = 0.116 / 233

Mole of BaSO₄ = 0.0005 mole

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Answer:

See below

Explanation:

A  Reactants

B  Activation energy

C  transition state

D  enthalpy change

E   products

The result of 554.3x10^117 - 5044x10^116 in standard form is  -4988.57 x10^116

The term standard form refers to a way in which mathematical notation is made much easier. It is always a number multiplied by 10 raised to a given power.

As such, the problem 554.3x10^117 - 5044x10^116 can be written as; 55.43x10^116 - 5044x10^116 = -4988.57 x10^116

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The description that correctly describes the acidity or the basicity of a solution is that:

The higher the pH is, the more the hydroxide ion concentration increases and the more basic the solution becomes.

The pH of a solution is determined by the strength of the acid and the base pair. Both of these are dependent on the same chemical reaction.

As the pH rises, the the hydroxide ion is increased in concentration and the solution gets to be more basic.

acidity -the amount of H+ ions can be produced by a compound determines the acidity

pH range:less than 7

acidity increase with decrease in pH number

basicity- the amount of OH- ion can be produced by a compound determines basicity

pH range : 8 to 14

7 is neutral

Basicity increases with increase in number.

Therefore the higher the pH is, the more the hydroxide ion concentration increases and the more basic the solution becomes.

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Destroying the wetlands will reduce the bay's water quality and vegetation will not grow effectively near bay as a result of which ecosystem will also destroy.

All species and the physical environment with which they interact make up an ecosystem.

As it is already mentioned that, water of the wetlands was carry nutrients which in turn was taken up by plants and vegetation, and if it will destroyed near a bay then the vegetation of that place will destroy as they will not get proper nutrients, which in turn also affects the ecosystem.

Hence destroying the wetlands will reduce the bay's water quality and vegetation will not grow effectively near bay as a result of which ecosystem will also destroy.

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Answer:

First The Answer

Destroying The Wetlands would drastically destroy the ecosystem and water quality in it.

Explanation:

Second. I ALSO go by the name Beanieboi! LOL One of us is an Imposter! (I hope not me, Because the full name is The Green-Haired Beanie Boi...

Anyhow...

THE BEANIE ARMY GROWS!!!!!!!

Answer:

A.) DNA is a double helix, and RNA is a single strand.

C.) DNA is involved only in transcription, and RNA is involved in both transcription and translation.

E.) DNA does not have uracil as a nitrogen base, but RNA does have uracil as a nitrogen base.

Explanation:

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Answer:

1.48 m solution would have a higher boiling point

Explanation:

It is harder to boil larger bodies of water than it is to boil a small body of water. This is because there is more surface area in the small body of water than the bigger one.

As surface area increases, reaction time increases.

Reactions would become slower.

Answer:

A.8g O² and 32g SO²

[tex] \bold \pink{Hope \: it \: Helps!}[/tex]

The quantities that contain the same number of molecules would be 2g [tex]H_2[/tex] and 44g [tex]CO_2[/tex].

According to Avogadro, 1 mole different substances contain the same number of molecules.

Thus, the quantities with the same number of moles will be the ones with the same number of molecules.

8g of [tex]O_2[/tex] (molar mass 32) and 32g of [tex]SO_2[/tex] (molar mass, 64) do not equate to the same number of moles.

2g of [tex]H_2[/tex]  (2/2 = 1 mole) and  44 g of [tex]CO_2[/tex]  (44/44 = 1 mole) have the same number of moles.

28g of CO (molar mass, 28) and 14g of [tex]N_2[/tex] (molar mass 28) do not equate to the same number of moles.

Also, 48 g  and 16 g of [tex]O_2[/tex] do not equate to the same mole.

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Mass is the multiplication product of moles and the molar mass. The mass of the lead chloride formed from 1.50 M potassium chloride is 10.42 gm.

The molarity of the solution is the ratio of the moles to the volume of the solution.

The double displacement reaction is shown as,

[tex]\rm 2KCl + Pb(NO_{3})_{2} \rightarrow PbCl_{2} + 2KNO_{3}[/tex]

From the reaction, it can be said that the stoichiometry ratio of potassium chloride and lead chloride is 2:1.

Given,

Molarity of potassium chloride = 1.50 M

1 L of potassium chloride = 1.50 moles

So, 50.0 ml will have,

[tex]\dfrac{1.50 \times 50}{1000} = 0.075\;\rm moles[/tex]

Moles of lead chloride formed will be:

[tex]\begin{aligned} &= \dfrac{1}{2} \times \text{number of KCl moles reacted}\\\\&= \dfrac{0.075}{2}\\\\&= 0.0375\;\rm moles\end{aligned}[/tex]

Given,

Moles of lead chloride = 0.0375 moles

Molar mass of lead chloride =  278 g/mol

Mass of lead chloride is calculated as:

[tex]278 \times 0.0375 = 10.42 \;\rm gm[/tex]

Therefore, 10.42 gm of lead chloride is formed.

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Answer:

This theory(Collision theory) was proposed by Max Trautz and William Lewis.

Answer:

Explanation:

a) v=w*lambda

wavelength=5/2.5

wavelength=2m

b)342/320=1.06875m

c)342/1.5=228 Hz

d)4.6153=v/wave

Answer:

All of these are part of an atom.

Answer:

helium ................

Here you go hope this helps :))

The colon removes water and some nutrients and electrolytes from partially digested food.

All it means is that there's an intimate physical mixture of the specified components in a solid or liquid phase.

The large intestine has 3 primary functions: absorbing water and electrolytes, producing and absorbing vitamins, and forming and propelling faeces toward the rectum for elimination.

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Answer: I think this one is the boiling water

sorry if wrong

Explanation:

Answer:

.135 L

Explanation:

P1V1 = P2V2

1*2=.27*V2

(1*2)/.27 = V2

V2 = .27 ÷ 2 = .135

Answer:

Chlorine has 18 neutrons.

Explanation:

Mass number = Atomic number + No. of neutrons

No. of neutrons = Mass number - Atomic  number

                          = 35  -17

                          = 18 Neutrons

Answer:

11 A

Explanation:

⇒ V = IR

⇒ 110 V = I * 10 Ω

⇒ I = 110/10

⇒ I = 11 A

The current flowing through the frying pan is equal to when 110 Volts are connected to the circuit.

Ohm’s law can be described as the voltage difference across any conductor being directly proportional to the electric current passing through that conductor. Assuming temperature and other conditions remain constant.

Ohm’s law can be applied only if the temperature will be constant. Ohm’s S.I. unit is rho (Ω), and the electric current raises the temperature.

The mathematical expression of voltage difference provided by Ohm's law is:

V = IR

Where V is the voltage difference and R is the resistance and I the electric current flowing.

Given, the voltage difference of the circuit,  V = 110 V

The resistance flowing through the circuit, R = 10 Ω

The electric current flowing through the frying pan can be calculated as:

I = V/R

I = 110/10

I = 11 A

Therefore, the electric current across the circuit is equal to 11 A.

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[tex]\text{Molarity,}~ S= 2.1~mol/L\\\\\text{Molar mas of}~ NaHCO_3, ~M=84~~ g/mol\\\\\text{Volume,}~~ V = 1 ~L\\\\\text{Mass,} ~w = ?[/tex]

[tex]\text{ We know that,}\\\\~~~~~S = \dfrac{n}V\\\\\implies n = SV\\\\\implies \dfrac{w}{M} = SV\\\\\implies w = SVM\\\\\implies w= 2.1 \times 1 \times 84\\\\\implies w =176.4 ~ g[/tex]