Given the balanced equation representing reaction: N2 + energy ==> N + N Which statement describes this reaction? ( I) Bonds are broken, and the reaction is endothermic. (2) Bonds are broken , and the reaction is exothermic. (3) Bonds are formed, and the reaction is endothermic. (4) Bonds are formed, and the reaction is exothermic.
Which change results in the formation of different substances? (1) burning of propane (2) melting of NaCl (s) (3) deposition of CO2(g) (4) solidification of water
Two forms of solid carbon, diamond and graphite, differ in their physical properties due to the differences in their (1) atomic numbers (2) crystal structures (3) isotopic abundances (4) percent compositions
What is the color of the indicator thymol blue in a solution that has a pH of 11? (1) red (3) pink (2) blue (4) yellow
Compared to the charge of a proton, the charge of all electron has (1) a greater magnitude and the same sign (2) a greater magnitude and the opposite sign (3) the same magnitude and the same sign (4) the same magnitude and the opposite sign
One beneficial use of radioisotopes is (1) detection of disease (2) neutralization of an acid spill (3) decreasing the dissolved O2(g) level in seawater (4) increasing the concentration of CO2(g) in the atmosphere
As water evaporates from an open container at 40°C, which one of the following is true? (a) The water becomes warmer as the kinetic energy of the liquid water molecules increases. (b) The water molecules decompose into hydrogen and oxygen molecules. (c) The water molecules return to the surface as fast as they leave. (d) The water vapour molecules have greater kinetic energy than the liquid water molecules.
I've been given the formula C5H12O. I need to determine the structure and IUPAC name by looking at the IR, proton NMR, and carbon NMR.
Consider the following 1.0 mol L–1 solutions. Which one of the following lists the solutions in decreasing order (that is, strongest to weakest) of electrolyte strength? (a) sodium phosphate > sulfuric acid > phosphoric acid > sucrose (sugar) (b) sucrose (sugar) > sulfuric acid > phosphoric acid > sodium phosphate (c) sulfuric acid > sodium phosphate > phosphoric acid > sucrose (sugar) (d) sodium phosphate > phosphoric acid > sulfuric acid > sucrose (sugar)
A pure substance is found to be a good conductor of electricity in both its solid and liquid phases. The bonding in the substance is which one of the following? (a) ionic (b) covalent molecular (c) metallic (d) covalent network
A typical neon light contains neon gas mixed with argon gas. If the total pressure of the mixture is 1.63 atm and the partial pressure of the neon is 0.71 atm. What is the partial pressure (atm) of argon?
