S Block - Group 2 Questions and Answers

Ethanethiol and dimethyl sulfide share the same chemical formula C H6S but different bonding arrangements Ethanethiol has a central carbon whereas dimethyl sulfide has a central sulfur Draw their Lewis structures

Use molecular orbital theory to predict the bond order of He2 2 5 0 1 1 5 O

8 If there are 2 81 x 1024 oxygen atoms available how many grams of barium hydroxide could be made 2 81x 10240 atoms

The media should only be open when the bunsen burner is on O True O False

If calcium were to react with chlorine what would likely form Select all that apply A calcium anion and a chlorine cation A Cat2 and CI 2 ion Two anions A Cat2 ion and two CI ions A calcium cation and two chloride anions A Ca Cl compound A CaCl compound

Select one De 18 Which of the following is the balanced chemical equation for the reaction of magnesium with nitrogen gas N2 to form magnesium nitride Mg3N2 a OMg N MgN O 3Mg N2 Mg3N2 O Mg N Mg3N2 Mg2 N2 2MgNT

Assign oxidation numbers to all of the elements in each of the compounds or ions below 11 H SO 1 HCI 2 KNO I 3 OH 4 Mg N 5 KCIO 12 H SO 13 BaO 14 KMnO 15 LiH

Beryllium nitride Be3N2 molar mass 55 056 g mol reacts with water to form beryllium hydroxide and ammonia What mass of water is required to completely consume 15 0 g of Be3N 033 7 g O 29 5 g 14 7 g 04 9 g 16g

of the following describes the element He e all that apply orms a basic solution in water s one of the group of the least reactive elements belongs to a group consisting entirely of gases consists of diatomic molecules in elemental form s very reactive as a metal reacts vigorously with alkali metals to form salts

What is the only possible value of me for an electron in an s orbital? Express your answer numerically. Part B What are the possible values of me for an electron in a d orbital? Express your answer numerically with sequential values separated by commas. Which of the following set of quantum numbers (ordered n, l, me, m.) are possible for an electron in an atom? Check all that apply. 5, 3, -3, 1/2 2,1,0,-1 3, 2, 2, -1/2 2, 2, 2, 1/2 4,2,3, -1/2 3,1, -2, -1/2 -1,0,0,-1/2 5,3,0, 1/2

Select all the statements that are true when magnesium reacts with chlorine: A. The compound that forms is MgCl B. Magnesium transfers electrons to chlorine C. Magnesium becomes a +2 cation D. Chlorine becomes a -2 anion DE. Chlorine transfers electrons to magnesium F. The formula for the compound formed is MgCl2 G. Chlorine becomes an anion

What mass of ammonia (NH3) will form when 8.6 g of N₂ reacts with enough H₂ to react completely? N₂ (g) + 3 H₂ (g) → 2 NH3 (9) 2.05 x 10³ g 10.5 g 20.9 g 2.62 g

In an experiment, magnesium sulfate heptahydrate, Epsom salt, is heated to a constant mass. What is the best representation of what happened in this experiment? 1. MgSO4 (byd) → MgSO4(gnhyd) 2. magnesium sulfate heptahydrate → anhydrous magnesium sulfate 3. MgSO.7H₂O → MgSO, + 7 H₂O 4. MgSO.H₂O(s) → MgSO.(s) + H₂O(g)

For each reaction in the table below, write the chemical formulae of any reactants that will be oxidized in second column of the table. Write the chemical formulae of any reactants that will be reduced in the third column.

What is the concentration of copper ions in an aqueous solution that is 2.0 M Cu₂SO4? (2 significant figures) Hint: How many copper ions does one formula unit produce? a. 1.0 M Cu b. 2.0 M Cut c. 4.0 M Cu+ d. 0.5 M Cu

53.1 g of calcium sulfate dihydrate, gypsum, is heated in an oven until all the water is driven off. What is the mass of the anhydrous compound? Provide your answer in decimal notation rounded to the appropriate number of significant figures.

Hematite, Fe2O3, is an important ore of iron. The free metal is obtained by reacting hematite with carbon monoxide, CO, in a blast furnace. Carbon monoxide is formed in the furnace by partial combustion of carbon. The reaction is Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) How many grams of iron can be produced from 1.62×103 g Fe2O3 reacting with an excess of CO? HOW DO WE GET THERE? How many moles are present in 1.62×10³ g of Fe₂O3(s)? mol Fe2O3(s)

Which of the following property of magnesium does not resemble with lithium? Bicarbonates of both exist in solution state but not in solidform Carbonates of both produce CO₂ on heating Both can produce nitride on reaction with N₂ Both can be identified by flame colour test

The first ionization energy of Mg is 735 kJ/mol. The second ionization energy is: less than 735 kJ/mol 735 kJ/mol More information is needed to answer this question. greater than 735 kJ/mol None of these choices are correct.

The successive ionization energies for an unknown element are I₁ = 896 kJ/mol 1₂-1752 kJ/mol 13-14,807 kJ/mol 14-17,948 kJ/mol To which family (that is, which group) in the periodic table does the unknown element most likely belong?

Calculate the number of liters of oxygen that are needed to react with 310. mL of CH4 at 80.0 °C and 790 mm Hg in a complete combustion reaction. 0.155 L 0.620 L 6.20×10^5 L 620 L

Boyle's law states that: The volume of a fixed amount of gas is directly proportional to its temperature in Kelvin at constant pressure. Equal amounts of gases occupy the same volume at constant temperature and pressure. The rates of effusion of gases are inversely proportional to the square roots of their molar masses. The total pressure of a mixture of gases is the simple sum of the partial pressure of all of the gaseous compounds. The volume of a fixed amount of gas is inversely proportional to its pressure at constant temperature.

For the following reaction, 23.0 grams of sodium chloride are allowed to react with 71.5 grams of silver nitrate. sodium chloride (aq) + silver nitrate (aq) →silver chloride (s) + sodium nitrate (aq) What is the maximum amount of silver chloride that can be formed? What is the FORMULA for the limiting reagent? What amount of the excess reagent remains after the reaction is complete?

.A sample of Be weighs 37.0 grams. Will a sample of Al that contains the same number of atoms weigh more or less than 37.0 grams? (more, less):_________ Calculate the mass of a sample of Al that contains the same number of atoms _______grams of Al

As you have seen, lead can form the same kinds of compounds as the alkaline earth metals, Nevertheless, the solubility values may differ markedly, Give a convincing reason based on the electron configurations of the metal ions.

Mike the maniac receives a porcelain elephant for his birthday. As he unpacks the gift, he decides to put the bubble wrap protecting the elephant in his liquid helium-cooled freezer. Before he puts the bubble wrap in the freezer, each bubble has a volume of 0.6 mL, at a temperature of 27°C. What will the volume of each bubble be if he lets the bubble wrap cool down to -223°C? Assume that pressure remains constant. ANS: (t1 = 300 K = 270C) (t2 = 50 K = -2230C) v2 = 0.1 mL

74.8 grams of bismuth (III) sulfate reacts with 41.9 grams of calcium chromate. Predict the products, write the complete reaction equation, balance, and calculate the mass of the aqueous product.

Property of the alkaline earth metal that increases with increase in their atomic number. Solubility of their hydroxides. Decomposition temperature of their carbonates. Solubility of their sulphates. Basic character of their oxides.

Barium sulfate,/BaSO, is a white crystalline solid that is insoluble in water. It is used by doctors to diagnose problems with the digestive system. Banum hydroxide, (Ba(OH),, is also a white crystalline sold and is used in wastewater treatment. How many more oxygen atoms are represented in the formula for barium sulfate than in the formula for barium hydroxide?

Calcium and chlorine form CaCl₂ rather than CaCl because less energy is required to remove one electron from the calcium atom than to remove two electrons more energy is released in forming chloride ions from chlorine molecules in the formation of CaCL(s) the lattice energy of CaCl (s) is less exothermic than of CaCl₂ (s) CaCl (s) is formed its elements, more energy is released than when CaCl₂ (s) is formed from its elements

Write a balanced chemical equation for the neutralization reaction of hydrochloric acid with sodium hydroxide. a. 2HCI + NaOH → NaCl + 2H₂O b. HCI + 2NaOH →2NaCl + H₂O c. 2HCl + 2NaOH → 2NaCl + 2H₂O d. HCI + NaOH → NaCl + H₂O

When 1 mole of Ca(OH)2 chemically reacts with 1 mole of H₂SO4, what salt is formed? a. Ca₂SO4 is the salt formed. b. Ca(OH)2 is the salt formed c. CaOH is the salt formed. d. CaSO4 is the salt formed.

In each of the following reactions, identify the reactant that is oxidized and the reactant that is reduced: a. 2Li(s) + F2 (g) → 2LIF(s) b. Cl2(g) + 2Kl(aq) →2 KCl(aq) + I2(s) c. 2Al(s) + 3Sn ²+ (aq) -> 2AI 3+ (aq) + 3Sn(s) d. Fe(s) + CuSO4(aq) → FeSO4 (aq) + Cu(s)

A sample of lithium sulfide has twice as many lithium atoms as it has sulfur atoms. If sulfur ions carry the charge 2-, what is the charge of lithium ions? A. 1- B. 1+ C. 2- D. 2+