Are there other universes?

How can something with different atoms be a pure substance and not a mixture?

Which element melts at room temperature?

What structural units make up metallic solids? O A. Molecules O B. Nonmetal atoms O c. lons O D. Metal atoms

What does the number next to isotopes signify?

You have recently discovered a new element, and find that this particular element has seven electrons in its outer energy level. What does this information tell you about the reactivity of this element? A. the element is non-reactiveB.

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.