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levacccp [35]
3 years ago
7

20950 joules of heat are added to a container with 400 g of water. how much does the temperature change??? Show work and formula

.
Chemistry
1 answer:
sp2606 [1]3 years ago
3 0

Answer:

Temperature change is 12.5°C

Explanation:

Let's apply the calorimetry formula for this problem

Q = c . m . ΔT

Where Q is heat (energy)

c is, the specific heat ( for water this value is 4.18 J/g°C) -  A constant that is specific to each substance / compound that determines how easy it is to heat or cool that substance

m = mass

ΔT = T° change

20950 J = 4.18 J/°C . 400 g . ΔT

20950 J 7 (4.18 J/°C . 400 g) =  ΔT → 12.5°C

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175 ml of a 1.6 m solution of kcl is diluted to a new volume of 1.0 l. what is the new concentration of the solution? (3 points)
djyliett [7]

175 ml of a 1.6 m solution of KCl is diluted to a new volume of 1.0 L. The new concentration of the solution is 0.28 m KCl.

Hence, Option (B) is correct answer.

<h3>What is Concentration ?</h3>

Concentration is defined as the measure of how much substance there is mixed with another substance.

<h3>How to find the concentration ?</h3>

To find the concentration use the dilution formula

C₁V₁ = C₂V₂

where,

C₁ = Concentration of starting solution

C₂ = Concentration of final solution

V₁ = Volume of the starting solution

V₂ = Volume of the final solution

Now put the values in above formula we get

C₁V₁ = C₂V₂

1.6 × 0.175 = C₂ × 1.0

0.28 = C₂ × 1.0

C₂ = 0.28

Thus from the above conclusion we can say that 175 ml of a 1.6 m solution of KCl is diluted to a new volume of 1.0 L. The new concentration of the solution is 0.28 m KCl.

Hence, Option (B) is correct answer.

Learn more about the Concentration here: brainly.com/question/17206790

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3 0
2 years ago
According to the law of conservation of matter, which statement about chemical reactions is true?
olga55 [171]

Answer:

B = Atoms can not be created or destroyed by chemical reaction.

Explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.

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3 years ago
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Answer:

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152 2s22p6 3s2 3pó 452 3d5
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Answer:

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We are given that when θ = 38.7°, the angle of refraction in the liquid is θ = 26.3°. Thus, from Snell's law, the index of refra
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Answer:1.4

Explanation:

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