Physics, 04.12.2020 17:20 allisondelp6

Suppose a log’s mass is 5 Kg. After burning, the mass of the ash is 1kg. Make a claim about what may have happened to the other 4kg. Provide evidence, and explain your reasoning

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Oxidization

While burning any material, any constituent element that can be oxidized to gaseous state oxides like Carbon, Hydrogen, Nitrogen, Sulfur(These are the most common elements found in plant and animal body) etc. are oxidized to their corresponding oxides. This is what constitutes the major part of smoke. The black particles you see in smoke are unburnt small carbon particles which get detached during burning.
Smoke inhalation thus becomes dangerous to humans because relatively oxygen content of the smoke is less when compared to Atmosphere.
C
O
2
,
S
O
2
,
N
O
2
etc are harmful to health.
If you stop the burning before the log becomes ash the remains has unburnt Carbon materials which is why it is black.
The ash you see are metal oxides and other non combustible substances together.

Answer from: Quest

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

Answer from: Quest

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

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Suppose a log’s mass is 5 Kg. After burning, the mass of the ash is 1kg. Make a claim about what may...