A large body in space that orbits a star and does not produce light of its own

Which elements are diatomic?

Filtration is the process in which a solid is removed from a liquid. True/False

What is the molar mass of a substance? O the mass in grams of one mole of a substance O the number of particles in one gram of a substance O the number of moles in one gram of a substance O the mass in grams of one particle of a substance 8980

A 2.50 g sample of zinc is heated, and then placed in a calorimeter containing 65.0 g of water. Temperature of water increases from 20.00 oC to 22.50 oC. The specific heat of zinc is 0.390 J/g oC.

Po-218 is an alpha emitter with a half-life of 3.0 minutes. if a sample contains 59 mg of po-218, how many alpha emissions would occur in 9.0 minutes?

Who's theory states that atoms are made up of empty space with electrons around a positively charged mass?

O3 (g) + NO (g) O2 (g) + NO2 (g) Write the equalibrium expression

You are given 10.00 mL of a solution of an unknown acid. The pH of this solution is exactly 2.36. You determine that the concentration of the unknown acid was 0.3535 M. You also determined that the acid was monoprotic (HA).

What mass of copper is consumed in the reaction with hydrochloric acid if 10.0 g of gas is collected?

How does the movement of molecules inside a solid block of iron change as the iron is heated? The molecules move faster. The molecules move slower. The molecules stop moving completely. The molecules move in the same way at all temperatures.