C125 revision Study guides, Class notes & Summaries

C125 REVISION EXAM QUESTIONS WITH COMPETE SOLUTIONS In the molar mass lab, why was it important to level the water in the graduated cylinder with that in the through? - Answer- so that the pressure inside the cylinder would equal atmospheric pressure butane hazards - Answer- butane lighter fluid is extremely flammable. it is a mixture of two isomers both of which boil at temperatures below 0°C at 1 atm pressure. the gas is stored as a liquid in the pressurized container. However, when th...

independent variable - Answer- the quantity you vary or control; it is assigned to the abscissa (x-axis) dependent variable - Answer- the quantity you measure in the lab; it is assigned to the ordinate (y-axis) ordinate - Answer- y-axis abscissa - Answer- x-axis slope - Answer- change in y/change in x best-fit line equations - Answer- y=mx+b *m is the slope; b is the y-intercept interpolated results - Answer- lie within the range of measured data extrapolated results - Answe...

C125 MIDTERM REVISION EXAM QUESTIONS WITH CORRECT ANSWERS A student experimentally determined the mass % compisition of Ca in CaCO3 to be 38.9%. What is the real mass % composition of CaCO3? What is the % error? - Answer- real = 40.04% error = 2.858% Recall the procedure (chemical measurements). How would the following source of errors affect calculated density of water? A balance was improperly calibrated and always weigh masses 1.0g less than the real masses - Answer- no effect (take...

rearrange the ideal gas equation, PV=nRT to the form y=mx+b for the case where V is plotted on the y-axis and n on the x-axis. Name the equation, slope,a dn intercept - Answer- V= RT/P (n) slope: RT/P intercept: none Interpolation - Answer- estimating a value within the range of measured data extrapolation - Answer- projection; conjecture; V. extrapolate: infer (unknown information) from known information best fit line equation commonly takes y=mx+b format. What are your y, x, and...

Interpolation - Answer- estimating a value within the range of measured data extrapolation - Answer- projection; conjecture; V. extrapolate: infer (unknown information) from known information best fit line equation commonly takes y=mx+b format. What are your y, x, and b? - Answer- y = dependent variable (v) x = independent (n) m = slope (RT/P) b = intercept In assignment 2 (excel), students are asked to obtain the slope and intercept by rearranging the Ideal Gas Equation into y=mx+b ...

independent variable - Answer- the quantity you vary or control; it is assigned to the abscissa (x-axis) dependent variable - Answer- the quantity you measure in the lab; it is assigned to the ordinate (y-axis) ordinate - Answer- y-axis abscissa - Answer- x-axis slope - Answer- change in y/change in x best-fit line equations - Answer- y=mx+b *m is the slope; b is the y-intercept interpolated results - Answer- lie within the range of measured data extrapolated results - Answe...