Ore is a deposit in Earth's crust of one or more valuable minerals. The most valuable ore deposits contain metals crucial to industry and trade, like copper, gold, and iron. Copper ore is mined for a variety of industrial uses. Copper, an excellent conductor of electricity, is used as electrical wire.
How does activation energy affect a chemical reaction ?
2 answers:
Answer: Option (B) is the correct answer.
Explanation:
Activation energy is the minimum amount of energy required to start or initiate a chemical reaction.
More is the activation energy more difficult is it for the reactants to participate in reaction.
Whereas a catalyst helps in increasing the rate of a reaction by increasing the energy of reactant molecules so that they can cross the activation energy barrier and therefore, formation of products become faster.
Thus, we can conclude that activation energy affect a chemical reaction as it determines how difficult it is to start the reaction.
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Answer:- Mass of the alloy is 2.8 kg.
Solution:- Mass of Cr in the alloy is 325 g and mass of Fe in the alloy is 2.5 kg. Mass of alloy would be the sum of masses of constituent metals.
Masses of the metals are not in the same units. So, we need to make the units equal. The want answer in kg so let's convert mass of Cr from g to kg.
Since, 1000 g = 1 kg
So,
= 0.325 kg
Mass of alloy = mass of Cr + mass of Fe
mass of alloy = 0.325 kg + 2.5 kg = 2.825 kg
If we consider significant figures then as per the rules, the answer should not have more than one decimal place.
So, 2.825 kg is round off to 2.8 kg and hence the mass of the alloy is 2.8 kg.