What is evidence of a physical change. A. ice melts B. silver tarnishes C. biycicle rusts

what is the molecular formula of a compound with an empiricla formula of ch and a molecular mass of 78

What does a cell do to a substance in Endocytosis

1 liter of carbon dioxide gas is collected over water at 100o C. If the total pressure in the container is 200.0 kPa, what is the pressure exerted by the carbon dioxide?

When a substance goes directly from a solid state to a gaseous state?

The best solution for the problem of pollution by man-made technologies A. cannot involve anyone who is not a technology expert or an expert on pollution. B. can come only from efforts by experts on pollution. C.

A) the ka for acetic acid (h3cco2h) is 1.737 * 10-5. what is the pka for this acid? b. use the pka calculated above to determine the ph at which [h3cco2h]=[h3cco2-].

Suppose you take a piece of hard wax from an unlit candle. After you roll the wax between your fingers for a while, it becomes soft. What State of matter is the softer wax? Is it possible for wax to change without changing state

Prevailing winds peru

Foods labeled "fat free" can actually contain less than 0.5 grams of fat.

Plants make their own food. The chemical reaction for this process is shown in the equation below. CO2 + H2O + energy → C6H1206 + O2 What are the products in this chemical reaction? O A. C6H1206 + energy O B. H20 + energy O C. CoH1206+02 O D.