what is the half life isotope if after 21 days you have 31.25 g remaining from a 250.0 g starting sample size?

What is the final concentration, in mg/mL, for a solution prepared by adding 12.00 mL of a 3.590 mg/mL Cu2 + stock solution into 100.00 mL volumetric flask and filled with water to the calibration mark?

Elena makes the table below to determine the number of atoms of each element in the chemical formula 3 (NH4) 2SO4 Total atoms Element Nitrogen Hydrogen Sulfur Calculation 1x2x3 4 x 2 x 3 1 x 4 x 3 4x3 24 12 Oxygen 12 What mistake did Elena make?

Which labels best complete the diagram? X: High resistance Y: Low resistance Z: Flow of electrons X: Low resistance Y: Flow of electrons Z: High resistance X: Flow of electrons Y: High potential energy Z: Low potential energy X: Low potential energy

The equation 2c3h7oh (g) + 9o2 (g) →6co2 (g) + 8h2o (g) is an example of which type of reaction?

in the united states car fuel efficiency is expressed in miles per gallon of gasoline. however fuel efficiency can also br expressed in kilometers per liter of gasoline. if the fuel efficiency of a car is 11.

Peter is 5 ft, 11 inches tall. Paul is 176 cm tall. Who is taller?

Which is the MOST accurate description about how the different types of feedback mechanisms work

What was one of the main benefits to the use of the icebox for cooling food?

How many moles of chlorine gas would occupy a volume of 35.5 L at a pressure of 0.98 atm and a temperature of 373 K?

What are the building blocks