Search
A 0.50 g sample of a Group 2 metal, M, was added to 40.0 cm3 of 1.00 mol dm–3 hydrochloric acid (an excess).
equation 1 M(s) + 2HCl (aq) → MCl 2(aq) + H2(g)
When the reaction had finished, the resulting solution was made up to 100 cm3 in a volumetric flask.
A 10.0 cm3 sample of the solution from the volumetric flask required 15.0 cm3 of 0.050 mol dm–3 sodium carbonate solution, Na2CO3, for complete neutralisation of the remaining hydrochloric acid.
Calculate the total amount, in moles, of hydrochloric acid remaining after the reaction shown in equation 1.
amount = ... mol
Use your answers to (a) and (b)(iv) to calculate the amount, in moles, of hydrochloric acid
that reacted with the 0.50 g sample of M.
amount = ... mol
Use your answer to (v) and equation 1 to calculate the amount, in moles, of M in the 0.50 g sample.
amount = ... mol Calculate the relative atomic mass, Ar, of M and identify M.
Ar of M = ... identity of M = ...
Two identical metallic spheres are suspended as bobs of a simple pendulum. Each of the bobs has a charge of If each string is 1m long and makes an angle of 12 degrees to the vertical, (a) what is the electric force between the spheres? (b) The bobs touched each other and then separated. What then is the electric force between the sphere?
An ice cube of mass 65 g is taken from a freezer at - 15 degrees * C and dropped into 125 cm ^ 3 of water at 85 degrees * C What will be the final temperature of the mixture? The specific heat of ice is 0.5 cal/g.^ C and latent heat of fusion of ice is 80 cal/g.
The density of salt is 2.16 g/cc. If you used 3.00 cc on your food, how much in ug is that?
A survey found that the average hotel room rate in New Orleans is $88.42 and the average room rate in Phoenix is $80.61. Assume that the data were obtained from two samples of 50 hotels each and that the standard deviations of the populations are $5.62 and $4.83, respectively. At α 0.05, can it be concluded that there is a significant difference in the rates?
1. What is the magnitude of the electric field at a field point 2 m from a point charge q0 = 4 nC?
2. Determine the electric field of a –60-nC charge that is experiencing an electric force of 2.75 x 10–4 N.
3. Suppose two point charges, q1 = + 43 nC and q2 = –17 nC, are separated by a distance of 6 cm. Determine the:
(a) electric force interacting between the two charges; and
(b) electric field of each charge.
4. Determine the electric field strength and potential in air at a distance of 3 cm from a charge of 5 X 10-8 C.
- What is the magnitude of the electric field at a field point 2 m from a point charge q0 = 4 nC?
- Determine the electric field of a –60-nC charge that is experiencing an electric force of
2.75 x 10-4 N.
- Suppose two point charges, q1 = + 43 nC and q2 = –17 nC, are separated by a distance of 6 cm. Determine the:
(a) electric force interacting between the two charges; and
(b) electric field of each charge.
- Determine the electric field strength and potential in air at a distance of 3 cm from a charge of 5 X 10-8 C
You are given a list L. Write a program to print all numbers in the list which are exactly repeated twice. The order of numbers should be same as in list.(for example if 3 appeared before 2 3 should be printed first.)
If no such number exist do not print anything. (input will be handled by us)
Input
[2,2,3,4,5,6,6,7,8,8,8,10, 3]
output
2
3
6
Explanation
Since 2, 3 and 6 is repeated 2 times output is 2, 3 and 6, whereas 8 is repeated 3 times so it is not printed.
The origin, structure and function of a root apex
A market consists of four individuals A, B, C and D whose demand functions are: -
QA=70-2P
QB=200-4P
QC=20-0.5P
QD=240-4P
If the industry supply equation is given by 𝑄5 =40+3.5𝑃
Compute the equilibrium price and quantity and determine the quantities that will be
purchased by each individual.
#340153 on Dec 2023