What color does green calcite streak? is this true for all colors of calcite?

What must models and theories do in order to remain valid? Provide 2 facts.

Whats a chemical change

Whenever a chemical is dispensed from its original container into a secondary container the secondary container must be labeled to show the product name and information true or false

How does Bohr's model of the atom compare with Thomson's model? They both describe atoms as small, indivisible spheres. They both describe electrons as moving around the nucleus.

If an unknown element displays many extremely strong metallic properties, where is it most likely to be located on the periodic table? far right along the "stair step" middle far left

Which atom can accommodate an octet of electrons but doesn't necessarily have to?

Heat is an exchange of internal energy from one system to another due to A. a temperature difference between the systems. B. one system being gas and the other being solid. C. the systems having the same temperature. D.

Sierra did 500 J of work to move her couch. If she exerts 250 N of force on the couch, how far did she move it? (Work: W = Fd) 0.5 m 2 m 250 m 750 m'

Lead (ii) sulfide (pbs) has a ksp of 3.0 * 10-28. what is the concentration of lead (ii) ions in a saturated solution of pbs? 1.7 * 10-14m 1.5 * 10-14m 3.0 * 10-14m

A 2.17 gm sample barium reacted completely with water what is the equation for the reaction how many milliliters of dry H2 evoled at 21degree celcius and 748mm of Hg?