Identifying the Purpose of a Reference Point What is the purpose of a reference point?
to provide a standard system of measurement
to establish a point from which to measure future distance, or it movement has occurred
to determine the speed of an object in miles per hour
to provide a standard from which to evaluate variables m an experiment

What element breaks down into yttrium-90?

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.