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vitfil [10]
3 years ago
9

What happens to the pH of an aqueous solution of HF when solid KF is added?

Chemistry
1 answer:
Murrr4er [49]3 years ago
7 0

It stays the same, because the concentration of H+ ions doesn't change.

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The moon is in a synchronous orbit with earth. What is a result of this type of orbit?
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Synchronous rotation is the result of tidal forces that over time slow the rotation of the smaller body until it is synchronized with its period of revolution around the larger body.

Explanation:

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True or false: Some parasites have complex life cycles where they live in different species of hosts at different stages
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Answer:

true

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If a physical or chemical change gives off heat energy, it is (4 points) an endothermic process a chemical process an exothermic
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<span>it is an exothermic process as the heat is released from the system and ΔH < 0
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4 years ago
Correct order of the levels of classification in the ecosystem
Dimas [21]
Numa máquina térmica uma parte da energia térmica fornecida ao sistema(Q1) é transformada em trabalho mecânico (τ) e o restante (Q2) é dissipado, perdido para o ambiente.



sendo:

τ: trabalho realizado (J) [Joule]
Q1: energia fornecida (J)
Q2: energia dissipada (J)


temos: τ = Q1 - Q2

O rendimento (η) é a razão do trabalho realizado pela energia fornecida:

η= τ/Q1

Exercícior resolvido:
Uma máquina térmica cíclica recebe 5000 J de calor de uma fonte quente e realiza trabalho de 3500 J. Calcule o rendimento dessa máquina térmica.

solução:

τ=3500 J
Q1=5000J

η= τ/Q1
η= 3500/5000
η= 0,7 ou seja 70%

Energia dissipada será:



τ = Q1 - Q2
Q2 = Q1- τ

Q2=5000-3500
Q2= 1500 J

Exercicio: Qual seria o rendimento se a máquina do exercicio anterior realizasse 4000J de trabalho com a mesma quantidade de calor fornecida ? Quanta energia seria dissipada agora?



obs: Entregar foto da resolução ou o cálculo passo a passo na mensagem
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3 years ago
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maw [93]
Nonrenewable resources include crude oil, natural gas, coal, and uranium.
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3 years ago
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