Which of the following are observations? The candle floats. The tires are flat. The dog is barking. The tire is flat because of a decrease in temperature. If a person walks by, then the dog will bark.

Will a precipitate form when 65.0 mL of 0.0200 M Ag2SO4 is mixed with 50.0 mL of 0.00500 M K2CO3? (Ksp for silver carbonate is 8.00 x 10-12).

Determine the empirical formula of kevlar, used in making bullet proof vests, is 70.6% c, 4.2% h, 11.8% n and 13.4% o.

Which example is a way that intercellular communication occurs? A: A molecule is sent through the plasmodesmata of a plant cell. B: A molecule is transmitted from one part of a cell to another to cause a response.

How many moles of carbon dioxide are needed to produce 15.0 moles of glucose

Are pure substances homogeneous or heterogeneous

Elements with the same number of shells are called? All the element that have the same number of valence electrons and have similar physical and che. ical properties are called?

How many moles are in 23.4 g

A chemist prepares hydrogen fluoride by means of the following reaction: CaF2 + H2SO4 - -> CaSO4 + 2HF The chemist uses 11 g of CaF2 and an excess of H2SO4, and the reaction produces 2.2 g of HF. (a) Calculate the theoretical yield of HF.

Gaps in rock layers that develop when agents of erosion remove existing rock layers

Why are atoms always neutral