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3 years ago

What example involves a phase change in which heat energy is released by the substance

1 answer:

7 0

Spontaneous phase changes that leads to an increase in the stability of a substance would release energy. For example, converting a gas to its liquid state such as cooling water vapor below its boiling point releases energy. Cooling allows water molecules to establish intermolecular hydrogen bonds to produce a liquid while releasing energy. The formation of bonds between water molecules is so exothermic that a steam scald can be significantly more serious to treat than a hot water scald.

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if, on average a person drinks eight glasses of water each day, and each glass contains 300 mL. a. how many liters of water will

yulyashka [42]

A.)

300 ml * 8 = 2.4 gallons a day.

now time to see how much a year..

2.4 * 365 = 876 liters

B.)

one liter = 2.2 pounds

876 x 2.2 = 1927.2 pounds

Answers:

A.) 2.4 * 365 = 876 liters

B.) 876 x 2.2 = 1927.2 pounds

5 0

3 years ago

Who was Charles Darwin and what theory is he best known for?

Alona [7]

Answer:

Charles Darwin, in full Charles Robert Darwin, (born February 12, 1809, Shrewsbury, Shropshire, England—died April 19, 1882, Downe, Kent), English naturalist whose scientific theory of evolution by natural selection became the foundation of modern evolutionary studies.

Charles Darwin's theory of evolution states that evolution happens by natural selection. Individuals in a species show variation in physical characteristics. ... As a consequence those individuals most suited to their environment survive and, given enough time, the species will gradually evolve.

Explanation:

please mark me brainliest please

8 0

3 years ago

Heat is most closely related to which kind of energy?

atroni [7]

Answer:

I'm very sure it's thermal energy.

Explanation:

3 0

3 years ago

Read 2 more answers

a flask was filled with SO2 at a partial pressure of 0.409 atm and O2 at a partial pressure of 0.601 atm. The following gas-phas

jarptica [38.1K]

Answer:

The equilibrium partial pressure of O2 is 0.545 atm

Explanation:

Step 1: Data given

Partial pressure of SO2 = 0.409 atm

Partial pressure of O2 = 0.601 atm

At equilibrium, the partial pressure of SO2 was 0.297 atm.

Step 2: The balanced equation

2SO2 + O2 ⇆ 2SO3

Step 3: The initial pressure

pSO2 = 0.409 atm

pO2 = 0.601 atm

pSO3 = 0 atm

Step 4: Calculate the pressure at the equilibrium

pSO2 = 0.409 - 2X atm

pO2 = 0.601 - X atm

pSO3 = 2X

pSO2 = 0.409 - 2X atm = 0.297

X = 0.056 atm

pO2 = 0.601 - 0.056 = 0.545 atm

pSO3 = 2*0.056 = 0.112 atm

Step 5: Calculate Kp

Kp = (pSO3)²/((pO2)*(pSO2)²)

Kp = (0.112²) / (0.545 * 0.297²)

Kp = 0.261

The equilibrium partial pressure of O2 is 0.545 atm

3 0

4 years ago

Looking at the different chemical structures, which one(s) might be able to hold

Romashka-Z-Leto [24]

Answer:

c) Fullerene and carbon nanotubes because they have empty spaces inside the molecules

Explanation:

Fullerene and carbon nanotubes would be the most desired in order to hold the cancer fighting drugs and to carry them through the body safely.

These molecules have empty spaces in them.
The cavities makes it possible for storage.
As they pass through the body, they can be held perfectly well to their target site of action.

3 0

3 years ago