18. What element has 81 protons in the nuclei of its atoms?

Why can color alone be used to identify most minerals?

What is the effect on the outlet temperatures in both the hot and cold streams, when the surface area (length and diameter) is reduced? a - The outlet temperature of the cold stream decreases and the outlet temperature of the hot stream increases.

What is the percent by volume of ethanol (C2H60 or ethyl alcohol) in the final solution when 45 mL of ethanol is diluted to a volume of 250 mL with water?

If a 1.50 L gas sample is held at a constant temperature, and its pressure is changed from 2.30 atm to 3.60 atm, what will the final volume be?

The chemical equation shown here is an example of what type of reaction? 2hclo4 (aq) + mg (oh) 2 (s), ↔ mg (clo4) 2 (aq) + 2h2o (aq)

vWould radiation with a wavelength 0.91 nm or a frequency of 5.9*1011 s-1 be detected by an X-ray detector? Would radiation with a wavelength 0.91 or a frequency of 5.9*1011 be detected by an X-ray detector? Only the radiation with a wavelength 0.

Why Thioacetamide is heated?

Which compound decreases in solubility as the temperature of the solution is increased from 10c to 50c

What variable is plotted on the x-axis

An atom's valence electrons are those electrons that have the highest energy True or False?