A person runs there hands together and they heat up

A 200-gram sample of a radioactive nuclide is left to decay for 60 hours. At the end of 60 hours, only 25 grams of the sample is left. What is the half-life of the nuclide sample? 60 hours 30 hours 40 hours 20 hours - - - > I think 20?

A sample was recorded to have 15.0 grams of hydrogen gas, how many liters would this be?

What measurement changes base on the strength of gravity?

Which process is responsible for the energy emitted from the sun and all other stars? A) nuclear fission B) nuclear fusion C) beta decay D) gamma decay

Jeremy hypothesized that adults with blue eyes are shorter than adults with brown eyes. He collected data by visiting all of the teachers in his school and found that his hypothesis was false. Should Jeremy consider his hypothesis useful? A.

Determine the number of moles 28.8 g Br2

Which statement best explains why heating a liquid affects its viscosity?

In which type of unconformity is the eroded rock tilted or folded? disconformity nonconformities angular unconformity scarp unconformity

What's the difference between an iconic bond and a covalent bond? A. an iconic bond Is a bond between charged atoms, while a covalent bond is a bond between neutral atoms B.

4. Given the chemical formulas of the following compounds, name each compound and state the rules applied to determine each name. Score • RbF • CuO • (NH4) 2C2O4 (Note: C2O4 - is called oxalate.)