Which of the following cannot be separated by physical means?

Mixtures

Solutions

Elements

None of the above

10. The number of protons in an atom is determined by the? a. Symbol b. Atomic mass c. atomic number d. group or period

If earth did not rotate what would happen to the hlobal wind

If you produce 10 moles of oxygen gas, how many grams of water did you start with?

Hydrogen gas is explosive within the range of 4% - 75% v/v. Assuming that each student in your class produces 6 L of H2 and that the lab is not ventilated, is there danger of an explosion. Show your calculations to back up your answers.

Ira is working in a lab with a unknown solution. When he inserts the electrical conductivity tester in the unknown, the bulb begins to glow brightly. Which of these would BEST describe the unknown liquid?

Running a mile involves

How many calories are there in a 255 Food Calorie snack bar? a. 1 x 103 b. 2.55 x 105 c. 1.07 x 103 d. 60.9 e. none of the above

What is the greatest amount of ammonia (NH3) in moles that can be made with 4.7 mol N2 and 6.9 mol H2? Which reactant is limiting? How many moles of excess reactant will be left after the reaction?

Which one of these elements is an alkaline earth metal

Write the chemical equations for the neutralization reactions that occurred when hcl and naoh were added to the buffer solution.