Give the number of significant figures indicated 0.224

Copper is added to a solution of nitric acid. The solution becomes hot and changes from colorless to dark blue. What is the best explanation for the change in temperature?

What is the mass, in grams, of 4.76 moles of oxygen gas (o2) ?

What percentage do the elements hydrogen and helium account for in the universe? A. 100% B. 99.9% C. 98% D. 99.8%

Explain why it is best not to pipe ya liquid directly from a reagant bottle

Which of the following describes an exothermic reaction? A + B Imported Asset AB + heat A + BΔ Imported Asset AB heat + BC Imported Asset B + C B + heat + CD Imported Asset BD + C

During what phase of the moon can a lunar eclipse occur? A) new moon B) first quarter C) waxing gibbous D) full moon

All bodies of water make up a earth's A. atmosphere B. asthenosphere C. hydrosphere D. lithosphere

Which characteristic provides clues to how igneous rocks were formes? A textures B color C luster D streaks

If your heart beats an average of 68 times per minute, how many times will your heart beat in an hour? In a day? In a week? Show all work

The gas described in parts a and b has a mass of 1.66 g. the sample is most likely which monatomic gas?