CHEM103 Exam Questions with Correct Answers

CHEM103 Exam Questions with Correct Answers Protons and neutrons are make of quarks. - ANSWER True The chemical symbol for gold is Ag. - ANSWER False If 300 students, in a college of 6000, own a cat; then 3.0% are cat owners. - ANSWER False The number 3020 has 3 significant digits. - ANSWER True The isotopes: Vanadium-50 and vanadium-51 both have 23 electrons - ANSWER True All number have some uncertainty associated with them. - ANSWER False The rusting of a Nail is both a chemical and a physical change. - ANSWER True A positive temperature value in the Fahrenheit scale can sometimes be converted to a negative number in the Celsius scale. - ANSWER True My wooden floor is 32.0 ft wide and 30.0 ft long. I want to sand and refinish the floor. This will cost $45.00 per square meter. Recall that there are 3.381 ft in 1 meter. - ANSWER 3,779.14 Please convert 475.0 oF to Kelvin temperature. - ANSWER 519.261 A piece of metal was found on the side of the road. The metal was put on a balance and found to have a mass of 23.45 g. The volume was determined by placing the metal into a 25.00 ml column of oil, which was displaced to 27.00 mL. What was the Density of this metal? - ANSWER 11.73 What is the formula weight of Cysteine? ___________ - ANSWER 121.16 What is the wt of 1 mole of sulfur atoms? - ANSWER 32.06 Cysteine, NH2CH2SHCOOH, is a proteinogenic amino acid, which means it is included in the formation of proteins. This sulfur containing amino acid is abundant in human hair and in high end hair care products. Given a 35.00 g sample of cysteine, calculate the grams of S atoms present. - ANSWER 9.26 What is the formula weight of Ethane, CH3-CH3? ___________ - ANSWER 30.97