An insoluble solid has a mass of 80.0 g . It is placed in a graduated cylinder containing 40.0 mL which then rises to 80.0 mL. What is the density of the solid?

a
(A) 0.300 g/mL
b
(B) 0.50 g/mL
c
(C) 2.00 g/mL

d
(D) 3.33 g/mL

The correct answer is (B) 0.50 g/mL

Explanation:

The density of a subtance is equal to the ratio between its mass and its volume, as follows:

d = m/v

In the problem, the mass is equal to 80.0 g. The volume is given by the increment in volume in the graduated cylinder when the solid is placed because the solid is insoluble so it displaces the liquid and increases the volume. The initial volume was 40.0 ml and the final volume was 80.0 ml, so:

V = Final volume - initial volume = 80.0 ml - 40.0 ml = 40.0 ml

Finally, we calculate the density by dividing the mass into the volume:

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".