A sample contains 6.25 percent parent isotope and 93.75 percent daughter isotopes. If the half-life of the parent isotope is 58 years, how old is the sample?

Is a pencil falling to the floor anon contact force, a force, or a contact force

For any chemical system, the goal of breaking or making bonds is to (decrease or increase) the overall potential energy of the system?

What is the effect of the biogeochemical cycles? O O O O cycling energy through a food chain recycling matter through the biosphere recycling rocks through the layers of Earth cycling nutrients through the human body

What is the main difference between the alpine tundra and the arctic tundra? a. The alpine tundra includes trees. b. The alpine tundra occurs on mountaintops. c. The alpine tundra has no animal life. d. The alpine tundra has lower temperatures.

What units do we use to measure mass?

In a scientific experiment, the one variable that is purposely changed to test a hypothesis is called the manipulated variable. true or false

Consider separate 100.0-g samples of each of the following: nh3, n2o, hcn, n2h4, and hno3. which of the samples has the greatest mass of nitrogen?

How many grams of iodine are needed to prepare 28.6 grams of ICl

How do the himalayan mountains affect the people of india

Convertible bonds are examples of: a. Securities that have characteristics of both debt and equity b. Non-recurring items c. Assets d. Treasury stock