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victus00 [196]
3 years ago
13

Why is a thermos considered a (mostly) closed system? Question 3 options: different types of liquids stay hot thermoses come in

different shapes and sizes different types of hot or cold items can be stored in a thermos matter and energy cannot enter or leave the system when the thermos lid is on tightly
Chemistry
1 answer:
cestrela7 [59]3 years ago
4 0

Answer:

Different types of hot or cold items can be stored in a thermos and power cannot enter or exit the system when the thermos lid is tightly closed

Explanation:

Closed systems are those that do not interact or do not exchange energy with the environment that surrounds them, that is why internal temperatures and conditions are maintained.

The human body is an open system, that is, it would be the opposite of the thermos since we constantly exchange energy with the environment through sweating, emission of gases, urine, feces, and the ingestion of food.

Thermoses are systems specially created to maintain a medium, it will be maintained if its lid is hermetically closed to prevent heat leakage or entry in situations of cold fluids.

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Go'=30.5 kJ/mol
makvit [3.9K]

Answer:

a) Keq = 4.5x10^-6

b) [oxaloacetate] = 9x10^-9 M

c) 23 oxaloacetate molecules

Explanation:

a) In the standard state we have to:

ΔGo = -R*T*ln(Keq) (eq.1)

ΔGo = 30.5 kJ/moles = 30500 J/moles

R = 8.314 J*K^-1*moles^-1

Clearing Keq:

Keq = e^(ΔGo/-R*T) = e^(30500/(-8.314*298)) = 4.5x10^-6

b) Keq = ([oxaloacetate]*[NADH])/([L-malate]*[NAD+])

4.5x10^-6 = ([oxaloacetate]/(0.20*10)

Clearing [oxaloacetate]:

[oxaloacetate] = 9x10^-9 M

c) the radius of the mitochondria is equal to:

r = 10^-5 dm

The volume of the mitochondria is:

V = (4/3)*pi*r^3 = (4/3)*pi*(10^-15)^3 = 4.18x10^-42 L

1 L of mitochondria contains 9x10^-9 M of oxaloacetate

Thus, 4.18x10^-42 L of mitochondria contains:

molecules of oxaloacetate = 4.18x10^-42 * 9x10^-9 * 6.023x10^23 = 2.27x10^-26 = 23 oxaloacetate molecules

3 0
4 years ago
Find mass of 4.5 moles of co2​
Kobotan [32]

Answer:

198g

Explanation:

Molar Mass of CO2 = 12 + (2x16) = 12 + 32 = 44g/mol

Number of mole of CO2 = 4.5moles

Mass of CO2 =?

Mass = number of mole x molar Mass

Mass of CO2 = 4.5 x 44 = 198g

5 0
3 years ago
What is kinetic energy?
oee [108]

Answer: Kinetic energy is energy possessed by an object in motion. ... Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v².

3 0
3 years ago
Read 2 more answers
Water freezes at _____. <br> A. 273°C<br> B. -273°C <br> C. 273 K<br> D. -273 K
BartSMP [9]
Correct answer is A
6 0
3 years ago
select the common word on the outside of a shipping container that will alert you to the fact that the material inside is hazard
Paha777 [63]

The common word on the outside of a shipping container that will alert you to the fact that the material inside is hazardous is caution.

<h3>What are hazardous statements?</h3>

Hazardous statements are those words or phrases that are labelled against chemicals which shows the degree of how dangerous the chemical are.

The common words that are used as hazardous statements which shows that a chemical is dangerous include the following:

  • Danger,

  • Caution and

  • Warning.

Therefore, the common word on the outside of a shipping container that will alert you to the fact that the material inside is hazardous is caution.

Learn more about hazard statements here:

brainly.com/question/2875871

#SPJ1

3 0
2 years ago
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