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:
a. True
b. True
c. False
d. True
Explanation:
a). A a very low substrate concentration , . Thus according to the Machaelis-Menten equation becomes
Here since the varies directly to the substrate concentration [S], the initial velocity is lower than the maximal velocity. Thus option (a) is true.
b). The Michaelis -Menten kinetics equation states that :
Here the initial velocity changes directly with the substrate concentration as is directly proportional to [S]. But
is same for any particular concentration of the enzymes. Thus, option (b) is true.
c). As the substrate concentration increases, the initial velocity also increases. Thus option (c) is false.
d). Option (d) explains the procedures to estimate the initial velocity which is correct. Thus, option (d) is true.