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Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

How many grams of mgbr2 are needed to produce 75g or metal?

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?