A sample of phosphorus-32 has a half-life of 14.28 days. If 55 g of this radioisotope remain unchanged after approximately 57 days, what was the mass of the original sample?

When a beta particle is released from a nucleus of an atom: the number of electrons in the atom is increased the number of protons in the nucleus is increased the mass number of the nucleus decreases by one the mass number of the nucleus increases

6co2 (g) + h2O (/) C6H12o6 + 6O2 (g) what is the statement and why is an endothermic reaction?

Which two statements about an electric motor are true?

Lord kelvin described the concept of absolute zero temperature and the laws relating the change in thermal energy during chemical reactions. whaty type of chemist would be be considered todayh

Matter does not exist in which scenario? parts of outer space where there is no air or atoms salt dissolved in water air in the lower levels of the Earth's atmosphere leather made from cow hides

If something is in high resolution you can see and object but not very clearly. True or False.

Which change might cause a cold spell in the northern united states

Kipps appratus is for what?

Which of the following statements about protons are true? Protons have twice the mass of neutrons. Protons have the same magnitude of charge as electrons but are opposite in sign. Protons have a charge of 1+.

What is true of an acidic solution at room temperature?