you have 100ml of a 7m solution of Pb NO3. if you need 3M solution, how much water should you add to the original solution

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

Precision can be defined as the o exact center of a data set. o reproducibility of a measured value. o correlation between two variables that are measured in a data set agreement between a measured value and an accepted value.