Answer:
A catalyst increases the rate of reaction by decreasing activation energy. ... Enzymes are highly substrate specific and catalyze reactions by providing an alternate pathway of lower activation energy.
Explanation:
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Answer:
Bring to the boil. Carefully place the can in the saucepan, ensuring there's enough water to completely cover the can at all times, topping up water frequently throughout the cooking process. Simmer, uncovered for 3 hours.
Answer: The specific heat capacity of the unknown metal given is
.
Explanation:
Given: Mass = 225 g
Change in temperature = 
Heat energy = 1363 J
The formula used to calculate specific heat is as follows.

where,
q = heat energy
m = mass of substance
C = specific heat
= change in temperature
Substitute the values into above formula as follows.

Thus, we can conclude that the specific heat capacity of the unknown metal given is
.