Holly determines the identity of a several metallic samples. For each material, she measures the mass of five separate samples twice using a two beam balance. Then she she measures the dimensions of the samples twice using a ruler or calipers and calculating the
volume. Finally she graphs the average mass versus average volume and determines the density of the samples from the best fit line.
Examine the procedure and elaborate on what modifications to the experimental procedure will increase the accuracy and precision of
this experiment

What is the mass of sodium in 3 moles of sodium chloride

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.