Malleability is the ability of a material to be pounded into thin sheets without breaking, as demonstrated in the process of papermaking.
Explanation:The ability of a material to be pounded into thin sheets is called malleability. This is a key characteristic of many metals, which allows them to deform under pressure without breaking or cracking. Malleability is demonstrated in the art of papermaking where materials such as the bark from the mulberry tree and hemp rags are pounded into a pulp and spread as sheets to dry, creating paper or parchment. Some materials, like rubber, exhibit plastic behavior, meaning they deform irreversibly and do not return to their original shape and size when the load is removed.
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FeCO3 → FeO + CO2 is what kind of reaction?
Double replacement
Decomposition
Synthesis
Single replacement
The molar volumes of solid and liquid lead at the normal melting temperature of lead are, respectively, 18.92 and 19.47 cm3. calculate the pressure
We use the formula:
ΔP = (ΔH / ΔV) ln(T2 / T1)
where,
ΔH = change in enthalpy from solid to liquid = 4810 J/mol
ΔV = change in volume from solid to liquid = 0.55 cm^3/mol
T2 = 620 K, T1 = 600 K
So,
ΔP = (4810 / 0.55) ln(620 / 600)
ΔP = 286.76 J/cm^3
or converting to atm:
ΔP = 2830 atm
Answer:
ΔP = (ΔH / ΔV) ln(T2 / T1)
Explanation:
Which of the following indicates a chemical change?
Question 7 options:
A.an exploding firecracker
B.a freezing ice cube
C.wood breaking into splinters
D.a wire conducting electricity
Answer: Option (A) is the correct answer.
Explanation:
Chemical changes are defined as the change which tend to show difference in chemical composition of a substance.
For example, toxicity, reactivity, combustion etc are all chemical properties.
A chemical change will always lead to the formation of a new compound and this change is irreversible in nature by any physical means.
When we explode a fire cracker then it is a chemical change.
On the other hand, a change which is unable to bring any difference in chemical composition of a substance is known as a physical change.
For example, change in shape, size, mass, volume etc are all physical properties.
Physical changes are reversible in nature.
Thus, we can conclude that out of the given options an exploding firecracker indicates a chemical change.
at 20 degrees celsius, how much sodium chloride could be dissolved in 2L of water
In this exercise we are going to deal with the solubility of a solution in which the amount of diluted sodium is 718 g.
What is the definition of a solution?Solutions are homogeneous systems formed by mixing two or more substances. Solutions are made up of two components: the solute, which is the one that dissolves and is found in the smallest amount, and the solvent, which is the component in the largest amount and acts by dissolving the solute.
In this way we have that:
35.89g of NaCl dissolve in 100 g of water at 20 °C.Making the calculus we have:
[tex](35.89g / 100 mL) * (2000) = 718 g[/tex]
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