CHEM 1311

In which set of elements would all members be expected to have very similar chemical properties? -P, Se, I -Br, I, At -Ne, Na, Mg -Cl, Br, Na -Si, As, Te correct answer: Br, I, At Of the following elements, which have been shown to form compounds? helium neon argon krypton xenon -xenon, krypton, and argon -xenon only -xenon and krypton -xenon and argon -None of the above can form compounds correct answer: xenon, krypton, and argon Which of the following correctly re...

A __________ ΔH corresponds to an __________ process. -zero, endothermic -positive, exothermic -negative, endothermic -zero, exothermic -positive, endothermic correct answer: positive, endothermic Which one of the following is NOT considered a fossil fuel? -natural gas -hydrogen -anthracite coal -petroleum -crude oil correct answer: hydrogen Which one of the following statements is FALSE? -The enthalpy change for a reaction is equal in magnitude, but opposite i...

Propane (C₃H₈) reacts with oxygen in the air to produce carbon dioxide and water. In a particular experiment, 38.0g of Carbon Dioxide are produced from the reaction 22.05g of propane with excess oxygen. What is the % yield in this reaction? -94.5 -66.0 -86.4 -38.0 -57.6 correct answer: 57.6 Gaseous argon has a density of 1.40 g/L at standard conditions. How many argon atoms are in 1.00L of argon gas at standard conditions? -4.76x10²² -6.02x10²³ -3.43x10²⁵ -1.59...

How many lone pairs of electrons are on the central element in CCI4? correct answer: 0 Use the VSEPR theory to predict the molecular geometry of nitrogen tribromide, NBr3 correct answer: Trigonal Pyramidal ________hybrid orbitals are used for bonding by Xe in the XeF4 molecule. correct answer: sp^3d^2 Which set of ions are isoelectronic in their ground state electron configuration? correct answer: N^3-, o^2-, Mg^2+, Al^3+ The familiar phenomenon of a rainbow results from the diff...

Types of Electrolytes: correct answer: -strong: SOLUBLE & IONIC -weak: SOLUBLE & MOLECULAR -non-electrolytes: INSOLUBLE Solubility Rules correct answer: 1. Group 1A Metals (Li+, Na+, K+, etc.) 2. Ammonium (NH4+) 3. Nitrate (NO3-) 4. Acetate (C2H3O2-) or (CH3COO-) 5. Hydrogren Carbonate (HCO3-) 6. Chlorate (ClO3-) 7. Perchlorate (ClO4-) 8. Halogens (Cl-, Br-, I-) EXCEPT W/ (Ag+, Pb2+, Hg2^2+) 9. Sulfate (SO4^2-) EXCEPT W/ (Ag+, Pb2+, Ca2+, Sr2+, Ba2+) Insolubility Rules correct ...

Solutions can exist in all 3 physical states correct answer: Solid: metal alloys (2 or more metals) Gas: Ex: Air — made of nitrogent oxygen and other gases Liquid: this is what we will be primarily discussing in this chapter, mostly solutions where water is the solvent AKA aqueous solutions Nonpolar solvents dissolve_______ correct answer: Nonpolar solutes Polar solvents dissolve______ correct answer: Polar solutes and many iconic solutes Polar correct answer: unequal sharing of...

Atom correct answer: Smallest quantity of matter that retains the properties of matter. Building blocks of all matter Element correct answer: A substance made up of a single type of atom. α Particle correct answer: A positively charged particle consisting of two protons and two neutrons, emitted in radioactive decay or nuclear fission. β Particle correct answer: High-speed electron, especially emitted in radioactive decay γ Rays correct answer: high-energy electromagnetic rad...

Atoms correct answer: the basic building blocks of all matter. The smallest unit of an element that can combine with other elements. Subatomic Particles correct answer: The smaller particles that make up atoms - protons, neutrons and electrons. cathode rays correct answer: streams of electrons that are produced when a high voltage is applied to electrodes in an evacuated tube Radioactivity correct answer: The spontaneous emission of radiation by an unstable atomic nucleus Nuclear...

Stiochiometry correct answer: Greek "Stiochion"= element "Metion"= measure Lavoisier correct answer: Mass is conserved in chemical rxn 2 parts of equation correct answer: Reactant and product Chemical equation for formation of water correct answer: 2H₂+O₂→2H₂O Stiochiometric coefficients correct answer: # in front of chemical formulas; give ratio of reactant and products Law of Conservation of Mass correct answer: Antione Lavoisier Matter cannot be lost in any...

Elements from opposite sides of the periodic table tend to form what? correct answer: Ionic compounds Which of the following has three significant figures? correct answer: 0.0803 Predict the empirical formula of the ionic compound that forms from aluminum and oxygen? correct answer: Al2O3 Which of the following would be the appropriate pH for a substance that tastes bitter, produces hydroxide ions in solution and ionizes completely(100%)? correct answer: 13 Which one of the compo...