Chemical reactions might be fast -- burning gasoline, or slow -- rusting. Usually the require two or more reactants. Most of these, along with requiring more than 1 substance, also requires something to get it started ... burning needs a spark to start it.
Nuclear decay only requires 1 thing, the radioactive element. Wait and it spontaneously undergoes decay.
Answer:
The time taken for the cross mark to disappear decreases steadily down the column.
Explanation:
Now if we look at the data provided, we will discover that the volume of the HCl was held constant while the volume of the thiosulphate was increased steadily and the volume of water decreased steadily.
Recall that a system is more concentrated when it contains less volume of water and more volume of reactants. Hence as the volume of water in the system is being reduced, the concentration of reactants is increased.
It has been established that an increase in the concentration of reactants lead to an increase in the rate of reaction. The disappearance of the cross shows the completion of the reaction between HCl and thiosulphate. The faster or slower the cross disappears, the faster or slower the rate of reaction.
Since increase in concentration of reactants increases the rate of reaction, it is observed that as the volume of the thiosulphate increases (reactant concentration increases) the cross disappears faster (rate of reactant increases). Hence as the volume of thiosulphate increases, it takes a shorter time for the cross to disappear. This implies that the time column in the table (refer to the question) will decrease steadily as the volume of thiosulphate increases.
0.9mole of Fe
Explanation:
Given parameters:
Mass of Fe = 50g
Unknown:
Number of moles of iron = ?
Solution:
The number of moles is the particle that contains the avogadro's number of particles.
It is a unit for reporting chemical measurement.
To find the number of moles of a substance;
Number of moles =
Molar mass of Fe= 56g/mol
Number of moles = = 0.9mole of Fe
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Answer:
Ethanoic or acetic acid.
Explanation:
Hello!
In this case, since the chemical formula of the compound excludes the hydrogen from the CHO form, we can infer it is a leaving group, which is likely to be bonded with an oxygen due to the high polarity of the O-H bond. In such a way, the most feasible condensed structure is:
Whereas the COOH stands for the carboxyl group; therefore the compound is ethanoic acid or acetic acid.
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In neutralisation reactions, acid and base reacts. Acid dissociates to give out H⁺ ions and bases dissociate to give out OH⁻ ions. These H⁺ ions and OH⁻ ions react to form H₂O molecules.
and the anion from the acid dissociation and cation from base dissociation form salts.
therefore in a neutralisation reaction acid reacts with base to form water and the corresponding salt
Mg(OH)₂ + 2HNO₃ ---> Mg(NO₃)₂ + 2H₂O
HCl + NaOH ---> NaCl + H₂O