List the following minerals in order of decreasing hardness: apatite, calcite, corundum, feldspar, and talc.

Classify each of the substances as a mixture, a compound, or an element ammonia neon copper - g

A strong acid can also be described as a very weak.

Fe + h2SO4>fe (SO4) 3+H2

Two fluorine atoms held together by covalent bond. Which statement correctly described this bond?

When combined, two gases have a pressure of 4.0 atm. If one gas has a pressure of 1.5 atm, what is the pressure of the second gas?

What is "change" when we are talking about natural and physical systems? A. Information that has been proven to be true B. Repeated processes that are used in a variety of ways C. A process for using knowledge and skills to acquire new knowledge D.

1. The sum of the pH and the pOH must always be equal to a constant value. What is the numerical constant?

What concentration of the lead ion, pb2+, must be exceeded to precipitate pbf2 from a solution that is 1.00*10-2 m in the fluoride ion, f-? ksp for lead (ii) fluoride is 3.3*10-8?

Calculate the temperatureoC that 0.2 moles of gas in a balloon at 2.0 atmoccupies 2.0 L.

How does the molecular count support the idea of a nucleotide as a subunit