What happens to the mass of a sample containing a radioactive element during its half-life?

A. The mass decreases by half. B. The amount of mass is doubled. C. Eventually there is no mass at all. D. The mass remains the same.

What is the transfer of material out of a cell by a sac or vesicle that first engulfs the material and then is extruded through an opening in the cell membrane

Which of the following is an example of the geosphere interacting with the cryosphere? Erosion due to glaciers creates valleys. Frost damages the cells in plant tissues. Plant roots make cracks in rocks and soil.

How many hydrogen atoms are present in 0.70 moles of ptcl2 (nh3) 2?

At STP, what is the volume of 1.0 mole of carbon dioxide?

what is molarity of a sodium hydroxide solution made by combining 2.0 L of 0.60 M NaOH with 495 mL of 3.0 M NaOH? Assume the volumes of the two solutions to be additive

How does the quantity of atp produced as a result of activity by the electron transport chain compare to the quantity produced as a result of glycolysis?

Molybdenum has a molar mass of 95.94g/mol. How many molecules of molybdenum are in 150.0 g of molybdenum

Describe a way that people might be able to solve each envioronmental problem listed below. coal mining can harm habitats and cause pollution.

A sample of methane gas occupies 4.50 gallons at a temperature of 80.0 F. If the pressure is held constant, what will be the volume of the gas at 100. degrees C?

Jack wants to know if it takes longer for warm water to freeze into ice cubes than cold water, so he performed the following experiment. Jack placed 50 mL of water in the refrigerator and allowed it to cool to a temperature of 4°C.