You are researching whether life could have ever existed on Mars. What would be the best choice for scientifically reliable information?

What is the mass number most similar to? The average mass of all isotopes of the element The sum of the atomic numbers of all isotopes The sum of the Masses of all the isotopes The average charge of all ions of the element

A certain drug is made from only two ingredients: compound A and compound B. There are 7 milliliters of compound A used for every 5 milliliters of compound B.

A girl pulls on a 10-kg wagon with a constant force of 20 N. whats is the wagon's acceleration?

The Ksp of AgCl is 1.8 * 10-10. How do you know that mixing equal amounts of 0.04M solution of AgNO3 and 0.002M solution of NaCl will lead to the formation of a precipitate?

All helium atoms have 2 protons. what is the atomic number of helium?

In calcium fluoride, what is the closets noble gas that each ion becomes?

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 45.0 % of an am-241 sample to decay?

What is the purpose of forming a scientific hypothesis? It starts a plan to test your idea It provides the answer to your investigation It allows you to prove your idea is correct

N2 + 3h2 2nh3 how many moles of hydrogen are needed to completely react with two moles of nitrogen?

While in Europe, if you drive 119 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 30.0 mi/gal? Assume that 1euro=1.26dollars.