4.An analysis to determine the percent weight of Cu in an ore sample gives the following results: 16.54, 16.30, 16.64, 16.67, 16.70, and 16.49 % w/w. Calculate the confidence
interval of the mean at 90% C. L.

The boiling point of propanoic acid is higher than that of 1-butanol because: propanoic acid has a higher molecular weight than 1-butanol. propanoic acid is more soluble in water than 1-butanol. propanoic acid is a better hydrogen bond donor than 1-butanol. propanoic acid forms hydrogen bonded dimers and 1-butanol does not. 1-butanol forms hydrogen bonded dimers and propanoic acid does not.

If a simple machine aduces the strength of a force, what must be increased? the speed of the input force the work the simple machine performs the size of the simple machine the distance over which the force is applied

What is formed when amino acids form long chains or polymerize