What is the freezing point of lead

Answers

Answer 1

Answer:

The freezing point of lead is 621.5 fahrenheit (327.5 celsius). The freezing point is the temperature at which a substance transitions from its liquid to its solid state, typically under normal atmospheric pressure.

The temperature at which a substance changes from its liquid phase to a solid phase, normally under normal atmospheric pressure, is referred to as the freezing point. It is a physical attribute of matter. This transition takes place when the attraction interactions between the substance's molecules outweigh their kinetic energy, leading the molecules to organise themselves in a predictable way and create a solid lattice. The nature of the substance, pressure, and contaminants in the substance are some of the elements that affect the freezing point. Different intermolecular forces of varying types and strengths give different substances different freezing points. Thefreezing pointof lead is 621.5 fahrenheit (327.5 celsius).

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Answer 2

Answer: The freezing point of lead is 621.5 fahrenheit (327.5 celsius)

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True or false. The synthesis of giant molecules from components of repeating units is polymerization.
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The reaction AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq) is a_________reaction. please help
A solution is considered basic or alkaline if its pH is _________ 7.A. equal toB. less thanC. greater than
The part of the atom that carries a positive charge is the _____, and the part that carries a neutral charge is the _____.neutron; protonelectron; protonproton; electronproton; neutron

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Answers

Answer:

1)conduction

2) convection

3) conduction

4) radiation

5) radiation

6) radiation

7) conduction

8) conduction

9) radiation

10) convection

Explanation:

not 100% sure

For each of the following strong base solutions, determine [OH−],[H3O+], pH, and pOH of 1.13×10^−2 M Ba(OH)2, 1.8x10^-4 M KOH, and 5.3x10^-4 M Ca(OH)2

Answers

pH calculations of strong base solutions are pretty direct. It all depends on how many OH- ions are dissociated and the concentration of the solution.

Ba(OH)2:

Since there are 2 OH- ions, the concentration of [OH-] is twice the concentration of the solution. Take the pOH by using the equation pOH = -log[OH-]. From here, you can get the pH by subtracting the pOH from 14. Finally, calculate the [H3O+] or [H+] concentration by using the equation pH = -log[H+] or [H+] = 10^(-pH)

[OH-] = 2 x 1.13x10^-2 M = 2.26x10^-2
pOH = -log[OH-] = 1.65
pH = 14 - 1.65 = 12.35
[H3O+] = 10^(-12.35) = 4.47x10^-13

Follow the same rule for the other compounds.

KOH:

[OH-] = 1.8x10^-4 M
pOH = -log[OH-] = 3.74
pH = 14 - 3.74 = 10.26
[H3O+] = 10^(-10.26) = 5.50x10^-11

Ca(OH)2:
[OH-] = 2 x 5.3x10^-4 M = 1.06x10^-3 M
pOH = -log[OH-] = 2.97
pH = 14 - 2.97 = 11.03
[H3O+] = 10^(-11.03) = 9.33x10^-12

How does temperature, pressure and surface area affect the dissolving process

Answers

If I am correct, yes. As I was told in chemistry, the surface area affects the dissolving of the "sugar". If you put regular Surat in a hot cup of coffee, it will dissolve at a quick pace, but what if you put the same amount of sugar in the same amour of coffee, but the sugar was fine powder? It would dissolve even faster since it has more surface area. So temperature does affect the dissolving. Hope this helps!

Temperature : - DIssolving process is fastened by increase in temperture.( directly proportional)

Pressure : - Dissolving process is fastened by decrease in pressure.( inversely proportional)

Surface area - Dissolving process is fastened by increase in surface area. ( directly proportional)

Plants perform photosynthesis during the night

only during an eclipse

only when the sun is not out

during the day

Answers

The correct answer is the fourth option. Plants perform photosynthesis during the day. Photosynthesis is the process in plants to make their food. This involves the use carbon dioxide to react with water and make sugar or glucose as the main product and oxygen as a by-product.

The first major source of oxygen gas was _____.a. volcanic outgassing
b. meteorite impacts
c. cyanobacteria
d. banded iron formations

Answers

The first major source of life on Earth was c. cyanobacteria. These organisms produce food by using energy from the sun; they are photosynthetic organisms. Over millions of years these organisms used CO2 in the air for photosynthesis and released oxygen as a byproduct. Over time oxygen concentrations rose high enough to support life.

The word that best fits in the blank in the sentence, "The first major source of oxygen gas was _____" is cyanobacteria. Thus, the answer is letter C. Cyanobacteria are blue-green algae and they are believed to have caused the "great Oxidation Event".

What else is produced when sodium carbonate decomposes? Na2CO3 Na2O +