What is the electronegativity difference that usually is the dividing line between covalent and ionic bonds?

Carbon and sodium chloride are both extended structures. What are the main differences between these two kinds of extended structures?

Who first established the heliocentric view

What is the mass (g) of 500. ml water if the density is 0.9901 g/ml?

The barometer shown in fig. p1.35 contains mercury (5 13.59 g/cm3). if the local atmospheric pressure is 100 kpa and g 5 9.81 m/s2, determine the height of the mercury column, l, in mmhg and inhg.

Does toxicity happen with high or low nutrient concentration?

a solution is approximately 332.0 g of salt per kilogram of solution. Assume this salt is all NaCl. What is the molality of this solution?

What burns fuel to release thermal energy

Scientist call an organism that has two different alleles for a trait

The molar mass of water (H2O) is 18.02 g/mol. Yun needs 0.025 mol H2O for a laboratory experiment. She calculates that she needs 72.0 g H2O for the experiment. Yun's calculation was incorrect because she set up her unit conversion incorrectly.

I'm doing isotope homework and I need the find the number of protons, neutrons, and electrons first one is chromium-58 and chromium-63