Americans combined drive about 5.5 x 109 miles per day and get an average of 22 miles per gallon. For each kg of gasoline that is burned about 3.0 kg of carbon dioxide are produced. How many kg of CO2 are emitted by US cars into the atmosphere each day? One gallon of gas weighs about 3.5 kg.

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state.a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car

What is the approximate mass of 25 cm3 of silver, if the density is 10.5 g/cm3? a. 0.42 g b. 2.4 g c. 42 g d. 260 g

Reactions in cells take place at about a. 40°c b. 0° c. 100°c d. 60°c