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

Your teacher asks you to follow the instructions in a lab to produce several known chemical reactions. During these procedures, you are required to record any observations that suggest chemical reactions have occurred.

What happens to the particles of a substance when thermal energy is added to the substance?

What are the characteristics of fluids

If the position of Earth were closer to the Sun, the strength of the solar wind reaching Earth would be?. Therefore, the atmosphere on Earth would be? Than it is now.

Which of these is not true about the proton? A. When a neutral hydrogen atom loses an electron, the proton remains. B. A proton is about 2000 times heavier than an electron. C. Electrons surrounding atoms get pulled into the nucleus by protons. D.

1. Water is an amphoteric substance. In any sample of water some of the moles In any sample of water some of the molecules perform acid- base reactions with each other. This is called the autoionization of water.

What state of matter is achieved if a large amount of energy is added to a gas? vapor liquid plasma solid

Which process is used to determine the concentration of an acid?

Using the ideal gas equation, calculate the pressure of oxygen gas in a cylinder with a volume of 25.00 L. The oxygen masses 4.362 kg and room temperature is at 22.5 o C.

Which of the following methods separates a homogeneous solution by spinning the solution very fast? Evaporation and distillation Filtration Centrifuge Magnetism