Iron (Fe) and diatomic oxygen (O2) combine to produce iron(III) oxide (Fe2O3). The table below compares the properties of these substances. Iron (Fe) Oxygen (O2) Iron(III) Oxide (Fe2O3) Melting Point (°C) 1538 −218.4 1565 Density (g/cm3) 7.83 0.00143 5.26 Appearance shiny, gray metal colorless, odorless gas red, odorless powder What can be concluded from this data? A. A chemical reaction occurred because iron(III) oxide has different properties than iron and diatomic oxygen. B. A chemical reaction occurred because iron(III) oxide has similar properties to iron and diatomic oxygen. C. A chemical reaction did not occur because iron(III) oxide is not a new substance. D. A chemical reaction did not occur because solid iron cannot chemically react with oxygen gas.

Based on the law of conservation of energy, which statement is false? answer- energy is lost when machines dont work right

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml

Main expenses you plan on making payments on a new car too. you want to spend 15% of your monthly net pay on the car payment, insurance, registration, and taxes combined. what is your monthly car allowance? $149.46 $298.91 $448.37 $597.83