The model of the atom has change as scientists have gathered new evidence. four models of the atom are shown below, but one important model is missing

Concentrations of lead in the bloodstream are often quoted in units of μg/dL. Averaged over an entire region, the mean concentration of lead in the blood was measured to be 1.5 μg/dL. Express this concentration in ppb.

Assuming linear behavior and a pathlength of exactly 1 cm, what molar concentration will measure an absorbance of

Draw the structure of the xylene that will give only two mononitro derivatives.

Which trait would most likely lead a scientist to investigate folk remedies of tribes living in the rain forest for new medicines?

A gas has a volume of 2.60 liters at a temperature of 87 degrees Celsius and pressure of 1.30 atm. What is the volume of gas, at a temperature of 367 degrees celcis and a pressure off 4.70atm

Can you zooley answers.

Select all that apply. Based on the properties that change in a chemical reaction, which are examples of chemical changes? baking a cake burning firewood leaf color from summer to fall shredding paper

Chemistry is the study of matter true or false

Which of the following reactions are redox reactions? a. Al (s) + 3Ag + (aq) →Al3 + (aq) + 3Ag (s) b. SO3 (g) + H2O (l) →H2SO4 (aq) c. Ba (s) + Cl2 (g) →BaCl2 (s) d. Mg (s) + Br2 (l) →MgBr2 (s)

How many liters of water are required to dissolve 1.00 g of barium chromate? express your answer in liters to three significant figures?