Describe the process in which elements of low mass, such as helium (2), and lithium (3), and elements of large mass, such as cobalt (27) and gold (79) are created. the answer should contain: supernova, low mass star, high mass star, nuclear fusion reaction

in a small paragraph please

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

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.