18 and 19
A student used 10 mL water instead of 30 mL for extraction of salt from mixture. How may this change the percentage of NaCl extracted? My book says: % NaCl= (grams of NaCl / total grams of mixture) x 100 What I don't get is if it does change the percentage, why? It says th...
You're given two things and asked to find another. You're given density, mass, and asked to find the volume. The formula for density is: D= Mass ------ Volume Rewrite this formula for Volume and you get: V= M --- D A 5.0 carat diamond will have a mass of: 5(0.200 g)= 1...
What is the specific gravity of alcohol having a density of .79 g/mL?
The relationship described below can be modeled using an equation. Identify the variables and write an equation to solve the questions below. Number of Credits Fees 3 2000 6 2600 9 3200 12 3800 15 4400 a) Write an equation to calculate the fees F when the number of credits n i...
a) 801 ¡ñ 30 + 4 ¡ñ 30 b) 65 ¡ñ 20 ¨C 5 ¡ñ 20 Just a dark circle in between each number 801 30 +4 30 65 20 -5 20
A speeder passes a parked police car at a constant speed of 31.8 m/s. At that instant, the police car starts from rest with a uniform acceleration of 2.74 m/s 2 . How much time passes before the speeder is overtaken by the police car?
A driver in a car traveling at a speed of 56 mi/h sees a deer 91.2 m away on the road. Calculate the magnitude of the acceleration necessary for the car to stop just barely missing the deer (assuming that the deer does not move in the meantime)