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garik1379 [7]
3 years ago
14

If you hold your hand over a pot of boiling water, it feels hot. Explain how the boiling water is transferring heat to your hand

. Convection, because boiling water has enough energy to turn into water vapor, which rises through the air and transfers heat to your hand Conduction, because as the water boils, liquid water droplets splash out of the pot and hit your hand, transferring heat Radiation, because heat from the sun warms the top of your hand and that transfers to the water Radiation, because the heat energy moves from the pot to the air and from the air to your hand
Chemistry
2 answers:
scoray [572]3 years ago
5 0

Answer:

Convection, because boiling water has enough energy to turn into water vapour, which rises through the air and transfers heat to your hand.

Explanation:

When water boils, it forms hot water vapour (steam). The hot vapour is less dense than air, so it rises and carries its heat energy along. This process is called convection.

B is wrong. Unless the water is boiling quite vigorously, liquid water droplets do not splash out of the pot.

C is wrong. You may be indoors where the sun is not shining.

D is wrong. Radiant energy would move directly from the pot to your hand.

FinnZ [79.3K]3 years ago
3 0

Answer: by conduction, which is direct touch

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Answer:

Explanation:

The oxidation state, sometimes referred to as oxidation number, describes the degree of oxidation (loss of electrons) of an atom in a chemical compound. Conceptually, the oxidation state, which may be positive, negative or zero, is the hypothetical charge that an atom would have if all bonds to atoms of different elements were 100% ionic, with no covalent component. This is never exactly true for real bonds.

The term oxidation was first used by Antoine Lavoisier to signify reaction of a substance with oxygen. Much later, it was realized that the substance, upon being oxidized, loses electrons, and the meaning was extended to include other reactions in which electrons are lost, regardless of whether oxygen was involved.

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3 years ago
a scuba diver's tank contains 0.29g of oxygen compressed into volume of 2.3L. What is the pressure in the tank at 9C?
viva [34]

Answer:

The answer to your question is P = 0.18 atm

Explanation:

Data

mass of O₂ = 0.29 g

Volume = 2.3 l

Pressure = ?

Temperature = 9°C

constant of ideal gases = 0.082 atm l/mol°K

Process

1.- Convert the mass of O₂ to moles

                16 g of O₂ -------------------- 1 mol

                0.29 g of O₂ ----------------   x

                    x = (0.29 x 1)/16

                    x = 0.29/16

                    x = 0.018 moles

2.- Convert the temperature to °K

Temperature = 9 + 273 = 282°K

3.- Use the ideal gas law ro find the answer

              PV = nRT

-Solve for P

              P = nRT/V

-Substitution

              P = (0.018 x 0.082 x 282) / 2.3

-Simplification

              P = 0.416/2.3

-Result

               P = 0.18 atm

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MgCl2 will need less concentration to achieve same osmotic pressure as NaCl. If the MgCl2 solution is isotonic with NaCl, the concentration of MgCl2 would be lower than NaCl
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