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Random Questions Calculations Bonding Structures Definitions $100 $100 $100 $100 $100 $200 $200 $200 $200 $200 $300 $300 $300 $300 $300 $400 $400 $400 $400 $400 $500 $500 $500 $500 You have selected an area of the board not in play. Click here to go back to the main board Random Questions - $100 • What is the correct name for the ionic compound, (NH4)2SO3 ANSWER Random Questions - $200 • What are the conditions for STP-temperature and pressure? ANSWER Random Questions - $300 Predict AND name the missing product in the following equation: BaCl2 (aq) + Na2SO4 (aq) _____ + 2 NaCl (aq) • Formula = • Name = ANSWER Random Questions - $400 • Which of the following compounds are ionic? – – – – NaOH CH4 NaCl Al2O3 ANSWER Random Questions - $500 • Which of the following polyatomic ions has the correct charge? – H2PO3 3– SO3 – C2H3O2 2– CrO4 2- ANSWER Calculations - $100 • How many molecules are in one mole of nitrogen gas? ANSWER Calculations - $200 A sample of hydrogen gas has a volume of 20 liters at STP. Calculate the mass of hydrogen gas present in this gas sample. ANSWER Calculations - $300 • Hydrofluoric acid, an aqueous solution containing dissolved hydrogen fluoride, is used to etch glass by reacting with the silica, SiO2, in the glass to produce gaseous silicon tetrafluoride and liquid water. The balanced equation is: 4HF (aq) + SiO2 (s) SiF4 (g) + 2H2O (l) • Calculate the mass of hydrogen fluoride needed to react with 5.68g of silica. ANSWER Calculations - $400 • Aluminum reacts with chlorine gas to form aluminum chloride according to the balanced equation: 2 Al (s) + 3 Cl2 (g) AlCl3 (s) In a certain experiment, 10.0 g of aluminum is reacted with 35.0 g of chlorine gas. What is the limiting reactant and what mass of aluminum chloride will be produced? ANSWER Calculations - $500 • A compound has been analyzed and has been found to have the following composition: copper 66.75%, phosphorus 10.84%, oxygen 22.41%. Determine the empirical formula and name(s) of this compound. ANSWER Bonding - $100 • a) b) c) d) e) Which of these elements has the highest electronegativity? Na Rb Ca S Cl ANSWER Bonding - $200 True or False? N2 is an example of a covalent bond. ANSWER Bonding - $300 Which of the following bonds would be the least polar yet still be considered polar covalent? Mg-O C-O O-O Si-O N-O ANSWER Bonding - $400 • If atom X forms a diatomic molecule with itself, the bond is… a) Ionic b) Polar covalent c) Nonpolar covalent ANSWER Bonding - $500 • When a molecule has a center of positive charge and a center of negative charge, it is said to have a _______ ________. ANSWER Structures - $100 • Which of the following has only nonpolar covalent bonds? N2 CO HI CCl4 NaCl ANSWER Structures - $200 Which of the following has a double bond? H2O C2H2 C2H4 CN- ANSWER Structures - $300 Which of the following molecules have a linear shape (choose all that apply) HBr NO3H2O SF4 KrCl4 ANSWER Structures - $400 • The Lewis Structure for which of the following contains the greatest number of lone pairs of electrons? CH4 HF F2 H2O H2 ANSWER Definitions - $100 • When ions are dissolved in water it is said to be a(n) ___________ solution ANSWER Definitions - $200 • When electrons fill atomic orbitals, there is a maximum of 2 electrons per orbital. These electrons must have ____________ spins according to the ________ _________ Principle. * What this means is that no 2 electrons in an atom can have the same 4 quantum numbers. ANSWER Definitions - $300 • Classify each of the following as either a chemical change or physical change: – You make scrambled eggs – You step on and crush a piece of chalk – You light a candle – Steam from your shower condenses on the mirror ANSWER Definitions - $400 • ______ is how close you are the correct measurement whereas _____ is how consistent you are in your measurement. ANSWER Definitions - $500 • Protons and neutrons are held together in the nucleus by – Electromagnetic repulsion – Nuclear charge – Electrostatic attraction – Nuclear “strong” force ANSWER ****Answers**** Random Questions - $100 (NH4)2SO3 = Ammonium Sulfite DONE Random Questions - $200 0 degrees Celsius (273 degrees kelvin) and 1 atmosphere DONE Random Questions - $300 BaSO4 Barium Sulfate DONE Random Questions - $400 – NaOH – NaCl – Al2O3 DONE Random Questions - $500 • CrO4 2- DONE Calculations - $100 1.204 x 1024 DONE Calculations - $200 1.80 g H2 DONE Calculations - $300 7.56 g HF DONE Calculations - $400 21.9 g AlCl3 can be produced when all of the Cl2 is reacted, since chlorine gas is the LR. DONE Calculations - $500 Cu3PO4 Copper (I) Phosphate Cuprous Phosphate DONE Bonding - $100 • B: I (iodine) DONE Bonding - $200 • A: TRUE DONE Bonding - $300 • E: N-O DONE Bonding - $400 C: Nonpolar Covalent Bond (occurs between like atoms) DONE Bonding - $500 • When a molecule has a center of positive charge and a center of negative charge, it is said to have a DIPOLE MOMENT. DONE Structures - $100 N2 DONE Structures - $200 C2H4 DONE Structures - $300 HBr DONE Structures - $400 F2 DONE Structures - $500 2 DONE Definitions - $100 • Aqueous solution DONE Definitions - $200 • Opposite spins () • Pauli Exclusion Principle DONE Definitions - $300 – You make scrambled eggs = chemical – You step on and crush a piece of chalk = physical – You light a candle = chemical – Steam from your shower condenses on the mirror = physical DONE Definitions - $400 Accurate ; precise DONE Definitions - $500 The nuclear force (or nuclear “strong” force) is the force between two or more nucleons. It is responsible for binding of protons and neutrons into atomic nuclei. DONE CONTINUE CONTINUE