Which process is an example of a chemical change?
2 answers:
Answer:
The correct answer is :<u><em>a metal railing rusting in damp weather</em></u> is an example of a chemical change.
Explanation:
Physical property is defined as the property of a substance which becomes evident during physical changes. Example: Melting point
A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.
Example: Melting of ice
Chemical property is defined as the property of a substance which becomes evident during chemical changes. Example: Reactivity with other substances
A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.
Example: Corrosion of iron called as rusting.
Rust is ferric oxide .
A metal railing rusting in damp weather is an example of chemical change because composition of an iron rail is changing.
Where as other examples given are the examples of physical change.
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Answer:
28.93 g/mol
Explanation:
This is an extension of Graham's Law of Effusion where
We're only talking about molar mass and time (t) here so we'll just concentrate on . Notice how the molar mass and time are on the same position, recall effusion is when gas escapes from a container through a small hole. The time it takes it to leave depends on the molar mass. If the gas is heavy, like Xe, it would take a longer time (4.83 minutes). If it was light it would leave in less time, that gives us somewhat an idea what our element could be, we know that it's atleast an element before Xenon.
Let's plug everything in and solve for M2. I chose M2 to be the unknown here because it's easier to have it basically as a whole number already.
The square root is easier to deal with if you take it out in the first step, so let's remove it by squaring each side by 2, the opposite of square root essentially.
M2= 0.22 x 131
M2= 28.93 g/mol