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2 years ago

True or false the melting of ice cubes is a exothermic reaction

Physics

1 answer:

DIA [1.3K]2 years ago

3 0

<h2>Hey There!</h2><h2>_____________________________________</h2><h2>Answer:</h2>

$\huge\boxed{False}$

<h2>_____________________________________</h2><h3>ENDOTHERMIC REACTIONS:</h3>

Endothermic Reaction are those reactions in which the reactants absorb the energy from their surrounding and forms the product.

<h2>_____________________________________</h2><h3>How to know endothermic reaction?</h3>

Those changes in which a substance goes from More-ordered state to less-oredered state are endothermic. Where they change from less ordered to more ordered is exothermic.

More ordered means that the movement of vibration of the particles of the substance is less and the are more close to each other. More to less ordered state is given as,

Solid>Liquid>Gas.

<h2>_____________________________________</h2><h2>Question:</h2>

In the question it asks about the melting of the ice cube. Ice cube is a solid, and when it will melt, it will change into the liquid water. As we know that, Solid is more ordered and Liquid is less ordered, and The change from more-ordered to less-ordered is endothermic thus the answer is ENDOTHERMIC.

<h2>_____________________________________</h2><h2>Best Regards,</h2><h2>'Borz'</h2><h2></h2>

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Audrey, an astronomer is searching for extra-solar planets using the technique of relativistic lensing. Though there are believe

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Answer:

- the expected value is 8

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Explanation:

Given the data in the question;

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∴ N(t) has distribution of poisson distribution with parameter (λt)

the mean is;

λ = 1 every month = 1/3 per month

E[N(t)] = λt

E[N(t)] = (1/3)(24)

E[N(t)] = 8

Therefore, the expected value is 8

For poisson process, Variance and mean are the same,

Var[N(t)] = Var[N(24)]

Var[N(t)] = E[N(24)]

Var[N(t)] = 8

so the standard deviation will be;

σ[N(24)] = √(Var[N(t)] )

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σ[N(24)] = 2.8284

Therefore, the standard deviation is 2.8284

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3 years ago

What is the equivalent resistance of the circuit?

Kaylis [27]

Answer:

80 Ω.

Explanation:

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3 years ago

Steve does 80 J of work to a rope threaded through a pulley and attached to a crate of anvils. The tension of the rope is 10 N a

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Answer:

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Explanation:

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3 years ago

Read 2 more answers

A constant-volume perfect gas thermometer indicates a pressure of 6.69 kPa at the triple point temperature of water (273.16 K).

mina [271]

Answer:

(a) ΔP=0.0245 kPa

(b) P=9.14 kPa

(c)ΔP=0.0245 kPa

Explanation:

(a) As it is perfect gas we can use

(P₁V₁)/T₁=(P₂V₂)/T₂

Since this constant volume so

P₁/T₁=P₂/T₂

T₂ is change in temperature

T₂=1.00+273.16

T₂=274.16 K

$P_{2}=(\frac{6.69}{273.16} )*274.16\\P_{2}=6.71449 kPa$

ΔP=6.71449-6.69

ΔP=0.0245 kPa

(b) As

$P_{2}=(\frac{6.69}{273.16} )*373.16\\P_{2}=9.14 kPa$

(c) Same steps as in part (a)

$P_{2}=(\frac{9.14}{373.16} )*374.16\\P_{2}=9.164kPa$

ΔP=9.164-9.14

ΔP=0.0245kPa

8 0

3 years ago