Who discovered Oxygen element

Calculate the enthalpy change per mole of oxygen consumed in the reaction: 2U (s) + 3O2 (g) → 2UO3 (s).

An automobile engine is 2.60 liters how many cubic inches is this

What is the significance of molecular formula

All atoms of isotopes of a particular element have the same number of protons, but different numbers of neutrons in their nuclei. True False

At 25°c, e° = + 1.88 v for a cell based on the reaction 3 agcl (s) + al (s) → 3 ag (s) + al3 + (aq) + 3 cl - (aq). find the cell potential e if [al3+] = 0.20 m and [cl-] = 0.010 m.

Distinguish between the terms accuracy and precision. In general, explain why a precise measurement does not always guarantee an accurate result.

Does it require more energy to melt an ionic compound or dissolve it in water? It requires much more energy to melt it. It takes about the same amount of energy. It requires much more energy to dissolve it. Ionic compounds are insoluble in water.

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?