robert

Define the following terms 
a. Dative bond
 b. Alkali earth metals 
c. Alkali earth metals 
d.Irreversible reaction 
e. Chemical equilibrium 

What mass of Ca(OH)2 is required to prepare 200mL of 0.2N solution? (Relative atomic mass are Ca=40smu , H=1amu , O=16amu)

Calculate the molality of 20% w/w aqueous solution of H2SO4 (Relative atomic mass are: H=1amu, S=32amu, O=16 amu )

What mass of H2SO4 is contained in 25g of 15% w/w solution? (Relative atomic mass are H=1amu , S=32amu, O=16amu)

Phosphorus and nitrogen are in the same group of the periodic table. The boiling point of phosphine (PH3, −85°C) is much lower than that of ammonia (NH3, −33.5°C). In just one statement give a reason for this different in boiling points 

To push a 25 kg crate up a 27° inclined plane, a worker exerts a force of 120 N, parallel to the incline. As the crate slides 3.6 m, how much is the work done by the worker and by the force of gravity?

Copper is made up of two isotopes, Cu−63 (62.9296amu) and Cu−65 (64.9278amu). Given copper’s atomic weight of 63.546, what is the percent abundance of each isotopes?

What is the escape velocity of earth?

What is the age of earth?

50mL of 2% (W/W) solution of NaOH is neutralized completely with 0.50M H2SO4. Given a density of 1.08g/ml  Calculate a) molarity of NaOH solution b) Molality c) volume of 0.50M H2SO4. d) Concentration of Na+ in parts per million.

The atomic number of the elements A , X, T, R and Q are 16, 23 , 27, 46 and 82 respectively. Without referring to periodic table 

a)Write the electronic structure of A, X, T, R and Q

b) To which group of periodic table does element A belong ?

c)To which period of the periodic table does R belong ?

d) Which of the elements are noble gases ?

e) Which of the elements is diamagnetic?

f) Which of the elements belong to f− block?

Tin(II) fluoride (SnF2) is often added to toothpaste as an ingredient to prevent tooth decay. How many moles of F are there in 24.6 g of the compound? ( Atomic masses are : Sn =118.7amu ,F = 19amu).

The direction of acceleration in uniform circular motion is along the -
1) direction of motion
2) tangent to the circle at the point of observation
3) direction of velocity
4) direction perpendicular to velocity

Which one of the following laws of electromagnetism does not give the direction of magnetic field?
1) Right-hand thumb rule
2) Fleming's left-hand rule
3) Fleming's right-hand rule
4) Faraday's law of electromagnetic induction

The atomic weight of naturally occurring neon is 20.18 amu. Naturally occurring neon is composed of two isotopes

(i)Ne−20 (19.99amu)

(ii)Ne−22(21.99amu)

Calculate the number of Ne−22 atoms in 12.55g sample of naturally occurring neon?

Pb has an average atomic mass of 207.19amu. The three major isotopes of Pb are Pb−206(205.98amu); Pb−207(206.98 amu) and Pb−208(207.98 amu). If the isotopes of Pb −207 and Pb−208 are present in equal amounts, calculate the percentage abundance of Pb−206, Pb−207,  Pb−208

 A non-spherical shining spoon can generally be considered as a -
1) Spherical mirror
2) Parabolic mirror
3) Plane mirror
4) Lens

A sample of naturally occurring silicon consists Si−28(amu=27.9769), Si−29(amu=28.9765) and Si−30(amu=29.9738). If the atomic mass of silicon is 28.0855 and the natural abundance of Si−29 is 4.67%, what are the natural abundance of Si−28 and Si−30?

Show if Energy Density and Young’s Modulus have the same dimensions.

Can a thesis title be started with "Desing and implement ................technique using...................."?

After spending 2 weeks’ holiday in China, Ken buys a saloon car weighing 40 piculs in the local unit of mass: given that 1 picul = 100 gins, 1 gin = 16 tahils, 1 tahil = 10 chees and 1 chee = 12 hoons. The weight of 1 hoon corresponds to a mass of 0.4 g. How much mass in tonnes will Ken declare on the shipment of the car?

Solve the following differential

x^•• –x^• –30=0

Solve the following differential 

dx/dt= t³/(x²+1)

Nitrogen is made up of two isotopes, 14-N and 15-N. Given the nitrogen’s atomic weight of 14.007, what is the percent abundance of each isotope?

The working principle of transformer is -
1) Self - induction
2) Mutual induction
3) Electromagnetic induction
4) Lorentz law

For the statements below, answer: True or false and justify your choice. 
A. If firms’ revenues just cover all its opportunity cost, then total revenue equals its explicitly cost. 
B. Total production will be maximum when marginal production is maximum
C. Average fixed cost is u-shaped
D. Total cost and total variable cost curves increase in a parallel way
E. Fuller utilization of fixed factors is one way of increasing returns to scale.

Differentiate the following terms as used in physics:

a) Metric units and SI units

b) Dimension and Dimensions

c) Accuracy and Precision

d) Error and Limit of precision

e) Systematic error and Gross error

Horses are to race over a certain English meadow for a distance of 4.0 furlongs. If 1
furlong = 201.168 m, 1 rod = 5.0292 m and 1 chain = 20.117 m, calculate the distance in:

a) Rods
b) Chains

0.100mole of sodium chloride [ NaCl] is dissolved into 100 grams of pure water H2O. What is the mole fraction of sodium chloride [ NaCl]?

What mass of K3PO4 is required to prepare 400mL solution that contains 6 x 10^21 K3PO4 particles per liter of solution?  ( atomic masses are  K=39amu, P=31amu  O=16amu)

Does the negative mass of antimatter mean that it's gravitationally repelled from stars?

How can an electron leap between atomic levels without passing through all the space in between? 

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Questions:

What information would they have obtained if they had conducted a need analysis?

1) A needs analysis would have determined the exact requirements, as per the province's human rights
codes, the club needed to implement.

2) A needs analysis may or may not have validated the decision to provide sensitivity training to staff, but
it would have almost certainly helped in determining whether or not staff were conversant with the
province’s human rights code.

3) A needs analysis would have provided the necessary data to design and develop a training framework
focused on organizational goals independent of the human rights code.

4) A needs analysis would have validated the decision to provide sensitivity training to staff, and it would
have helped determine that the staff were not conversant with the province’s human rights code.

5) None of the above.

Using the above thought cycle as a guide, we are able to consistently analyze the case study: 

13. List the major glands of the endocrine system.

(y - 3) (y - 6) = 0

y equals what ?

Symplify n! /(n-3)!