Which two elements make up more than 90 of the dry weight of plants?

How many times is CO2 denser than H2? A 22 times B 1.96 times C 0.089 D they have the same density because they are both gases E cannot be calculated

An engineer that designs buildings is a (n)

Which of these best explains why the hydrogen atoms in a water molecule are attracted to Cl - ions in sodium chloride (NaCl) ? A. The hydrogen atoms have + 1 charges. B. The hydrogen atoms share electrons equally with the oxygen atom. C.

2. Calculate the mass of solvent in grams in a solution containing 3.0 grams of Tylenol if the mass percent is 3.5%.

What is the abreviation for carbon dioxide?

True or false. The synthesis of giant molecules from components of repeating units is polymerization.

Which term names an environmental cost of fossil fuel consumption? A. cheap energy B. increased greenhouse gases C. renewable resource D. low pollution

Slowly heating butter in a pan until it changes from a solid to a liquid is an example of a physical change. True False

Action - reaction forces don't cancel each other. A. True B. False

An equilibrium is dynamic. True False