A 73.7 gram piece of metal at 45.0°C loses 253.5 joules of energy as it cools to 23,5°C. What is the metal
substance? How do you know?

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

For each of the following types of reactions, write a general reaction formula in the symbolic form—for example, a + b → ab. single-displacement double-displacement synthesis decomposition

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