APPLY During a change of state, a material may absorb or release energy instead of changing temperature. How might this characteristic of phase changes be used to solve a problem?

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?

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2

Asample of sea water contains 6.28g of sodium chloride per litre of solution. how many milligrams of sodium chloride would be contained in 15.0ml of this solution?