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Q1. The elements of group 1 (Li-Cs) are very electropositive because of A. they all have small atomic radii B. they all have high second ionisation energies C. their ions all have a high charge density D. they all have low first ionisation energies Q2. Radium occurs below barium in group 2. On the basis of the trends in the chemistry of group 2, which of the following statements is true? [explain your answer] A. radium sulfate is more soluble in water than Magnesium sulfate B. radium carbonate is more easily decomposed by heating than magnesium carbonate C. radium hydroxide is more soluble in water than calcium hydroxide D. radium carbonate is very soluble in water
Periodicity in the ionization energy and balancing the equation - Complete the following chemical reactions by writing the product(s) and balancing the equations:
Aerosol cans carry clear warnings against incineration because of the high pressures that can develop upon heating. Suppose a can contains a residual amount of gas at a pressure of 755mm Hg and a temperature of 25 C
Butadiene, C4H6(used to make synthetic rubber and latex paints) dimerizes to C8H12 with a rate law of rate=0.038L/(mol*s)[C4H6]^2. What will be the concentration of C4H6 after 2.0 hours if the initial concentration is 0.044M?
sodium hydroxide do you need to add to the volumetric flask before you dilute the solution to volume with distilled water?
Nitrogen dioxide is obtained in a cylinder, but exists in equilibrium with dinitrogen tetrooxide. A 5.00g sample of this mixture is transferred to a 0.5L flask at 298K.
A zero-order reaction has a constant rate of 2.90×10-4 M/rm s. If after 65.0 seconds the concentration has dropped to 9.00×10-2 M, what was the initial concentration.
When the two substances reach thermal equilibrium, the final temperature is 24.2 degrees celcius. What is the mass of the copper block?
if you dissolve the weighed mass of zinc in water which had not been deionized, how would the volume of EDTA required to reach the indicator end-point
if there are 45 drops of alcohol/mL, and the density of alcohol is 0.789g/mL. what is the blood alcohol concentration?
At 450 K the rate constant is 15.4 atm-1s-1. How much time (in s) is needed for NOCl originally at a partial pressure of 46 torr to decay to 25.8 torr?
By what factor (how many times) will the rate constant increase when the temperature is raised from 10°C to 28°C?
The initial temperature of the water was 25.4 C and the final temperature of both the water and metal was 36.6 C. If the specific heat "c"
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