Achemistry student combines 32 grams of one chemical and an unknown amount of another chemical in a closed system. a chemical reaction occurs and the mass of the products is 114 grams. how much of the unknown chemical was used in the reaction?

Which of the following best explains why the end of a spoon sticking out of a cup of hot water also gets hot? question 7 options: the heat from the hot water is conducted through the spoon handle the hot water heats the air surrounding the upper part of the spoon. the hot water causes a physical change in the spoon handle. the hot water causes a chemical reaction to take place in the spoon.

Consider this initial-rate data at a certain temperature for the reaction described by

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.