Give reason. (a) Copper metal is a pure substance (b) A copper metal alloy brass is a mixture

Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen

Imagine that twenty i. u.’s of enzyme z were catalyzing the above reaction for one minute, under vmaxconditions, in a 3.00 ml assay volume. the assay is buffered with 20 mm phosphate buffer, ph 7.60. what will the ph be at the end of that one minute?

What is the molar mass of a gas that has density of 2.054 g/l