Define radioactive substance has a half-life

Assignment Help Chemistry
Reference no: EM13242904

An unknown radioactive substance has a half-life of 3.20 hours. If 38.7g of the substance is currently present, what mass was present 8.00 hours ago

Reference no: EM13242904

Questions Cloud

Agricultural civilizations crystallized along these rivers : Explain the ways in which the Indus, the Nile, the Tigris and Euphrates, and the Yangzi and Yellow Rivers shaped the development of ancient Chinese, Indian, Egyptian, and Mesopotamian civilizations.
Explain an alpha emitter with a half-life : Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years . How long will it take in years for 40.0 % of an Am-241 sample to decay
What r the mean and variance of the distribution : a broadcasting executive is reviewing the prospects for a new television series,according to her judement , the probability is 0.25 that the show will achieve a rating higher than 17.8, and the probability is 0.15
Determine the magnitude of the force on the wire : A 225-m length of wire stretches between two towers and carries a 180-A current. Determine the magnitude of the force on the wire due to the Earth's magnetic field
Define radioactive substance has a half-life : An unknown radioactive substance has a half-life of 3.20 hours. If 38.7g of the substance is currently present, what mass was present 8.00 hours ago
Discuss the ways in which animal and plant cultivation : Discuss the ways in which animal and plant cultivation of the Neolithic Age changed humanity economically, politically, religiously, socially, and technologically.
Human evolution has been both biological-cultural process : Human evolution has been both a biological and cultural process. Identify and discuss the major biological and cultural developments of this process from the advent of Australopithecine to the Neolithic Revolution.
Explain the radioactive isotope to decay : How long does it take for the radioactive isotope to decay to 4.9×10?3 mg? (Assume no excretion of the nuclide from the body.)
What will be the new potential : A charged object has a potential of 40 V at a distance of 3 m. If the distance is increased to 42 m, then what will be the new potential

Reviews

Write a Review

Chemistry Questions & Answers

  What is its final temperature

A lead fishing weight with a mass of 68 g absorbs 146 cal of heat. If its initial temperature is 56°C, what is its final temperature.

  Calculate the equilibrium concentrations of the gases

If all four gases had initial concentrations of 0.650 M, calculate the equilibrium concentrations of the gases.

  Compute the partial pressure of ozone

On a smoggy day in a certain city the ozone concentration was 0.54 ppm by volume. Calculate the partial pressure of ozone and the number of ozone molecules per liter of air if the temperature and pressure

  How many milliliters of 0.483 m hbr solution can be made

How many milliliters of 0.483 M HBr solution can be made from 38.0 mL of 8.00 M HBr solution?

  Calculate the amount of energy as heat

calculate the amount of energy as heat by the freezing of 13.3 g of a liquid substance. given that the substance has a molar mass of 82.9g/mol and a molar enthalpy of fusion of 4.60 kj/mol.

  Describe what is the molarity of a solution

What is the molarity of a solution when 38.8g of potassium chromate (K2CrO4 ) is dissolved in enough water to make 3 liters of solution

  What will happen to the equilibrium as oh- ions are added

What will happen to the equilibrium as OH- ions are added?

  Find the mass of carbon

A substance containing 28.84% Nitrogen, 0.0648g Hydrogen, and Oxygen and Carbon, with (total) mass (of the substance) 1.2953, is burned in excess oxygen to produce 2.241 grams of carbon dioxide.

  Which ion would remain in the supernatant

If a sodium hydroxide solution were added to a solution containing lead(II) ions, sodium ions, nickel(II) ions and potassium ions, which ion(s) would remain in the supernatant?

  State three carbon species that has a carbon level of zero

a three carbon species that has a carbon level of zero at each carbon atom. b) two compounds that contain three carbon atoms and have a carbon atom with a carbon level of 1.

  State what is the average molar mass

What is the average molar mass (in g/mol)? What is the relative standard deviation(RSD) in parts per thousand (ppt)? Report your answer to the correct number of significant figures.

  State solutions in order of increasing freezing points

Arrange the following aqueous solutions in order of increasing freezing points

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd