Which of the following is an example of a chemical change? A. Boiling water B. Burning paper C. Dissolving sugar in water D. Melting gold

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

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?