How is Francium used by humans

What is the partial pressure of argon, par, in the flask? express your answer to three significant figures and include the appropriate unit?

The time that is taken by neptune once around the sun is called

Raising the temperature of a reacting system increases the rate of the reaction, but does NOT increase the a) activation energy b) number of collisions c) fraction of the reacting particles which possess energies greater than the activation energy

Round 23.455 to 4 significant digits:

Which of these molecules has a lewis structure with a central atom having no nonbonding electron pairs?

Which element has an ion that is smaller than an ion calcium? Potassium, strontium, cesium, magnesium

A peregrine falcon can travel 537,600 furlong/fortnight. A race car travels 212ft/s. A spider can jump with a maximum velocity of 9,000,000 cm/hr. Which travels the fastest?

how many energy levels (shells) does an atom of oxygen have? How do you know this by looking at the periodic table?

A student needs to use 0.575 moles of sodium chloride in an experiment. How many grams should he mass out?

Which of the following seperation methods is used to seperate plant pigments? Filtration, Chromatography, fractional distillation, simple distillation?