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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
Explain clearly the properties of agood freezing agent basing the explanation vant hoffs factor and on colligative property.
Bonding in some solids does not fit neatly into one of the four categories. Explain why the bonding in Na2CO3 is not purely ionic.
A 0.0490 molal aqueous NaBr solution freezes at -0.173°C. What is its apparent percent dissociation in this solution? Kf = 1.86°C/m for water. NaBr -> Na+ + Br-
Osmium has a density of 22.6 g/cm3. What volume (in cm3) would be occupied by a 21.8 g sample of osmium?
The half-life of radon-222 is 3.8 days. How much of a 100 g sample is left after 15.2 days?
If two ideal gases are both placed in identical containers with at the same constant Volume and Temp and same number of moles of gas
The molar heat of neutralization from hydrochloric acid and sodium hydroxide is -57.3 kj/mol. What is the heat evolved during the neutralization of 655ml of 1.00M hydrochloric acid by 1.00M sodium hydroxide?
Identify the type of interactions involved in each of the following processes taking place during the dissolution of sodium chloride in water. -Interactions between water molecules
A vitamin C capsule is analyzed by tirating with 0.3M NaOH. It is found that 24.4 ml of base is required to react with a capsule weighing 0.55g.
If a mixture of gases contained 78% nitrogen at a pressure of and 22% carbon dioxide at 345 torr, what is the total pressure of the system?
if .025 grams of Pb(NO3)2 is dissolved in 100. grams of H2O, what is the concentration of the resulting solution in parts per million?
calculate the amount in grams of calcium sulfate which is formed when 185 grams of calcium fluoride are reacted with excess sulfuric acid.
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