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3 years ago

When calculating specific heat, what does the variable 'Q' represent?

Chemistry

2 answers:

dlinn [17]3 years ago

7 0

Answer:

Thermal Energy

Explanation:

Educere Founders Education Answer

LekaFEV [45]3 years ago

4 0

Answer:

Heat Energy

Explanation:

Specific heat is the a thermodynamic property of the substances. When we have to raise the temperature of unit mass of a given substance by one degree, the heat we will require for this purpose is known as Specific Heat.

Specific heat is calculated using the following formula which relates the specific heat with Heat Energy and Temperature

$Q=mc$ Δ $T$

Where,

$Q$ = Heat energy,

$m$ = mass of the substance in Kg.,

$c$ = Specific heat, and

Δ $T$ = change in temperature in kelvins.

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A tank contains 200 gallons of water in which 300 grams of salt is dissolved. A brine solution containing 0.4 kilograms of salt

Nadusha1986 [10]

Answer:

<h3>Therefore, after long period of time 80kg of salt will remain in tank</h3>

Explanation:

given amount of salt at time t is A(t)

initial amount of salt =300 gm =0.3kg

=>A(0)=0.3

rate of salt inflow =5*0.4= 2 kg/min

rate of salt out flow =5*A/(200)=A/40

rate of change of salt at time t , dA/dt= rate of salt inflow- ratew of salt outflow

$dA/dt=2-(A/40)\\\\dA=2dt-(A/40)dt\\\\dA+(A/40)dt=2dt$

integrating factor

$=e^{\int\limits (1/40) \, dt}$

integrating factor $=e^{(1/40)t}$

multiply on both sides by $=e^{(1/40)t}$

$dAe^{(1/40)t}+(A/40)e^{(1/40)t} dt =2e^{(1/40)t}t\\\\(Ae^{(1/40)t})=2e^{(1/40)t}t$

integrate on both sides

$\int\limits(Ae^{(1/40)t})=\int\limits2e^{(1/40)t}dt\\\\(Ae^{(1/40)t})=2*40e^{(1/40)t}+C\\\\A=80+(C/e^{(1/40)t})\\\\A(0)=0.3\\\\0.3=80+(C/e^{(1/40)t}^*^0)\\\\0.3=80+(C/1)\\\\C=0.3-80\\\\C=-79.7\\\\A(t)=80-(79.7/e^{(1/40)t})$

after long period of time means t - > ∞

${t \to \infty}\\\\ \lim_{t \to \infty} A_t \\\\ \lim_{t \to \infty} (80)-(79/{e^{(1/40)t}}\\\\=80-(0)\\\\=80$

<h3>Therefore, after long period of time 80kg of salt will remain in tank</h3>

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3 years ago

An ion always has a ________ or ________ charge. While a covalent bond always has no _________, meaning it is __________.

almond37 [142]

An ion has a positive or negative charge. While a covalent bond always has no charge, meaning it is neutral.

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4 years ago

What is the atomic number and name of an element that has 15 protons in its nucleus?

just olya [345]

Answer:

phosphorus.

Explanation:

The atomic number of phosphorus is 15 so the protons will be 15.

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3 years ago

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mrs_skeptik [129]

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