How many atoms are in 165 g of calcium?

A train travels 99 km in two hours and then 72 km in two hours what is it's average speed

11 A sample of CO2 (s) and a sample of CO2 (g) differ in their (1) chemical compositions (2) empirical formulas (3) molecular structures (4) physical properties

How could an alpha particle pass straight through the metal foil and strike the center of the phosphor screen on the other side without scattering at all?

Can chemicals be used to separate a solution of potassium and zinc if yes how

What is the [H+] if the pH of a solution is 7.90

What is the name of the compound composed of iron and carbonate? [hint: iron has a + 3 charge in this compound]?

In a chemical equation the products appear on which side of the equation? A. Left B. Top C. Right D. Bottom

What does the shape of a protein molecule resemble?

Which set of terms best defines what affects kinetic energy and potential energy, respectively? position, gravity gravity, velocity velocity, height height, position

Which radiation detection device is the best to use for measuring the presence of radiation in large moving objects where constant monitoring is impossible? film badge Geiger counter cloud chamber scintillation counter