How many grams of MgBr2 are in 1.4 Lof a 4.2% (W/M) solution? Enter your unrounded answer without units,
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Suppose that during that icy hot lab 65,000 j of energy were transferred to 450 g of water at 20°c what would have have been the final temperature of the water

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

Convert the temperature of dry ice, –77 ∞c, into degrees fahrenheit and kelvin.