He 64.8-g sample of the compound X2O5 contains 48.0 g of oxygen atoms. What is the molar mass of element X?

How does the number of valence electrons in atoms of metalloids explain why metalloids are semiconductors? They have one or two valence electrons, so they cannot lose electrons easily.

Which of the following explains why the lab safety policy specifically addresses loose clothing, contact lenses, and large, loose, or dangling jewelry? Select one: a. Contact with chemicals in the lab might damage these items. b.

Why do cars tires need more air in the winter then in the summer?

Which will burn the fastest sugar water, salt water, or water?

Which of the following statements about the Moon is true? A. The Sun and the Moon orbit the Earth at the same rate. B. The Moon is the Sun's largest natural satellite. C. The Moon orbits the Sun once every 29.5 days. D.

What conclusion can be drawn from the statement that an element has low electron affinity, low electronegativity, and a low ionization energy?

A scientist performs an experiment in which a radium-226 (Ra-226) atom decays into radon-222 (Rn-222). The scientist concludes that some energy must have been added to the system to cause this reaction to begin.

Which suitable method can be used to separate a mixture of sand and paraffin

How many vowels does the word love have

What is silicon used for? -matches -gunpowder -glass -steel can coating