americium-241 has a half-life of 430 years. how much of a 10.0g sample of americium-241 remains after 1720 years?

Describe what happens to a suspension if it is left to stand.

Find the final concentration of NO3 - in a solution made by combining 0.954 L of 0.140 M Al (NO3) 3 with 0.652 L of 0.430M LiNO3. A) 0.026 M B) 0.052 M C) 0.160 M D) 0.320 M E) 0.639 M

Which statement best explains why objects are pulled toward Earth's center? Earth has a magnetic force that is strongest at its core. Earth has a much greater mass than objects on its surface.

How is a thermochemical equation different from a balanced chemical equation

Describe the process by which ozone can be formed in large cities.

Which of the following are physically properties of a penny

Complete the following statements about the functions of the digestive system. The starts an involuntary swallowing action when it senses food. The squeezes food down the digestive tract by an involuntary synchronized muscle movement called.

Explain how thermal energy is transferred through convection.

What are the coefficients that will balance this skeleton equation? a l c l 3 + naoh → al (oh) 3 + nacl?

Which cluster in the agriculture industry would be most likely to partner with the animal systems cluster to introduce new modern procedures to animal careers