Answer:
41.03 %
Explanation:
Given that,
The actual length of a strip of aluminum is 2.12 m
Observed length of a strip of aluminum is 1.25 m
We need to find the student's percent error. The percentage error on any value is given by :

Putting all values, we get :

So, the percent error of the student is 41.03 %.
Answer:
Why is the unit of force called a derived unit? That's because the Newton is defined in terms of other units which are more fundamental. One Newton is the force required to accelerate a mass of one kilogramme at the rate of one metre per second squared.
Answer:its already balanced I.e.
Nacl+AgNO3=Agcl+NaNO3
is a balanced chemical reaction.
Explanation:
Actual yield / theoretical yield * 100
1.9g/3.5g * 100
=54.28571429%
= 54.3% to 1d.p
the element is Ca with atomic number 20