A. True.
Very true. The quicker or slower the reactants are used up the faster or slower the rate of reaction, and the faster or slower the products are formed, the faster or slower the rate of reaction.
Answer: The relative error of the resulting quantity is 0.018.
Explanation: Relative error of the quantities when are multiplied together is usually less than or equal to the sum of each relative error. Mathematically, it is represented as
According to the question,
Let us assume that the three quantities are 
Taking log on both the sides, we get
Relative error is calculated by:
This value has 3 significant figures only, so the resulting relative error is 0.018.
The ball isn't magnetic, therefore, the nail wasn't attracted towards the ball, but rather towards the magnet.
Answer:
Barometric pressure will be 
Explanation:
We know, 
where P is barometric pressure, h is height of liquid inside barometer, 
is density of liquid and g is gravitational constant
If barometric pressure is x cm 
for 805 mm Hg then-
So, 
Hence barometric pressure will be
Answer:
B. Identify solutions to the problem.
Explanation:
In the case described above, the engineer has already designed and attempted to manufacture a prototype for the process. The design of the process must have also been carefully researched and planed.
However, he identified the problem of low yield and is now working towards identifying solutions to the problem. One option he seeks to explore according to the question is to change the catalyst used in the reaction.
