At a depth of 40 m, the water pressure is 500 kPa. A diver breathing air (78% N2, 21% O2) at this depth would have what partial pressure of oxygen in his lungs?

You put a solid in water and it floats but doesn't dissolve. A) The density of water equals the density of the solid B) The water's density is greater than that of the solid C) The water's density is less than that of the solid

Calculate the density if the Mass = 25.69 g and the Volume = 10.5 g/mL

In a 1.0 * 10-6 M solution of Ba (OH) 2 (aq) at 25 °C, identify the relative molar amounts of these species.

Which of the following is and example of a chemical change

Which of the following is a measure of the average kinetic energy of the particles in a sample of matter? A. chemical kinetics B. thermochemistry C. reaction rate D. temperature

4*C: 4cm 8*C: 10cm 12*C: 14cm 16*C: 18cm 20*C:24cm 24*C: 12cm what is the independent variable, dependent variable and three constant variables?

In the chemical laboratory, why do scientists use a mortar and pestle? a. to increase surface area of a solute b. to decrease surface area of a solute c. to increase temperature of a solute d. to decrease temperature of a solute

Is a mixture being separated into two elements a chemical change

Which electrons are lost by an atom of iron when it forms the Fe3 + ion? A. One s orbital electron and two d orbital electrons B. Two s orbital electrons and one d orbital electron C. Three s orbital electrons D. Three d orbital electrons

What does a three letter chemical symbol mean