If the half life of a radioactive isotope is 4000 years, how much would be left in a fossil after 4000 years

Were would you be if all the stars you see are circumpolar ps its not on top of the highest mountain lol

A cracker crushed in water will test positive with iodine but negative with benedict's solution. A cracker crushed in water has another chemical called amylase added to it.

When a sample of a gas was placed in a sealed container with a volume of 3.35L and heated to 105°C, the gas vaporized and the resulting pressure inside the container was 170.0kPa. How many moles of the gas was president?

A solution is created by dissolving 13.0 grams of ammonium chloride in enough water to make 325 mL of solution. How many moles of ammonium chloride are present in the resulting solution?

What is the maximum number of electrons in the following energy level?

Audrey is driving 50 miles in 2 hours what is her average speed?

Water has a specific heat of 4184 J / (kgK) how much energy is needed to increase the temperature os a kilogram of water 5C?

A student noticed while doing the neutralization experiment that the calorimeter kept getting warmer. how would this error affect the final calculation for the δhneut of each reaction? would it be overestimated, underestimated or remain unaffected?

A solution contains 45 grams of nitrogen gas and 40 grams of argon. What is the mole fraction of argon in this solution?

How is an animal cell related to tissue and organs