Grade 7 Science Energy and Heat Fill-in-the-Blank

Fill in the words from the word box above. (There are extra words) a) Energy is measured in units called joules. b) Fuels are examples of chemical energy stores. c) Fuels need oxygen in order to burn. d) Coal and oil are examples of non-renewable energy resources. e) Solar and wind are examples of renewable energy resources. f) In a power station, steam spins a turbine. g) The spinning turbine drives a generator to produce electricity. h) Hot objects store thermal energy. i) The law of energy conservation states that energy cannot be created or destroyed. j) When energy is wasted as heat to the surroundings, it is called dissipation. k) A thermometer is used to measure temperature. l) Heat energy moves from a hot object to a cold object. m) In solids, particles mainly vibrate in place. n) Materials like copper and iron are good heat conductors. o) Wood and rubber are examples of heat insulators. p) Conduction is the transfer of heat through direct contact between particles. q) Convection currents can only happen in liquids and gases. r) The Sun transfers heat to Earth by radiation. s) Radiation can travel through empty space. t) Dark surfaces absorb heat energy more than shiny surfaces. u) When particles spread farther apart, the substance becomes less dense. v) During thermal equilibrium, two objects reach the same temperature. w) In gases, particles move very fast and freely. x) Free electrons help metals transfer heat quickly. y) Thermal energy depends on both temperature and the number of particles in an object.