Q4. True or false: a 1. All reactions need the amount of energy to occur 2. The
ID: 914380 • Letter: Q
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Q4. True or false: a 1. All reactions need the amount of energy to occur 2. The higher the dipole moment of the compound, the more polar 3. The effective nuclear charge of an atom increases as its size increases 4. The limiting reactant controls the amount of product produced 5. The density of a gas is directly proportional with its molar mass 6. The percent mass of Hydrogen in CCI is 25% 7. The empirical formula of carbon dioxide is co 8. The lattice energy of a compound depends on its melting point 9. H20 is a weak electrolyte 10. All the salts containing Sodium are soluble in water Q5. Choose the correct answer for the following questions: 1. The correct name for Cuo is b, Cuprous oxide a. Cupric oxide d. None of the above c. Calcium hydroxide For points 2+3) The following reaction is called a hydrogenation reaction: Hz(g) C2H4(g) CaH (g) 2. Calculate the enthalpy of the reaction (AHT, for Ha, CaHa and caHs are 0, 52.3 k/mol, and 284.7 kJ/mol, respectively.): b. +136 kJ/mol a. -32 kJ/mol d. The energy cannot be calculated 3. s the reaction endo or exothermic? b, Exothermic d. The energy cannot be calculated a. Endothermic c, Neither endo nor exothermic For points 4+5+6) Consider the following reaction: 2FeCbs 2FeCiz b. oxidation reduction reaction 4. What kind of react is it? d. None of the above a. Precipitation reaction c. Acid base reactionExplanation / Answer
Answer 1.
a. False: somre reactions release energy, They do not require energy.
b. False. Polarity also depends on symmetry of the molecule.
c. False: it is vice-versa
d. True
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