1) Does exothermic mean that energy is taken in to or released from the chemicals? a) Taken in b) Released to the surroundings 2) What is the opposite of exothermic? a) enthalpy b) enthraperthic c) endoskeleton d) endinious e) endothermic f) poilikothermic 3) Citric acid and sodium hydrogencarbonate react together. Is it exothermic or endothermic? a) Endothermic b) Exothermic 4) Any combustion (burning in oxygen) reaction. Is it exothermic or endothermic? a) Exothermic b) Endothermic 5) Ice melting in a summer drink. Exothermic or endothermic? a) Endothermic b) Exothermic 6) Water freezing on a cold day. Exothermic or endothermic? a) Endothermic b) Exothermic 7) Which of these is the odd one out? a) Methane burning in air b) Neutralisation c) Iron oxidising d) Thermal decomposition e) Magnesium and hydrochloric acid 8) When we are talking about energy changes in chemical reactions, where exactly is the chemical energy stored? a) In the atoms b) In the electrons c) In the nucleus d) In the bonds e) In the molecules f) In the reactants 9) What was the biggest source of error when you investigated energy changes in reactions? a) Reading the measuring cylinder incorrectly b) Using the balance wrong c) Losing thermal energy to the surroundings d) Not repeating the experiment e) Doing it wrong f) Using the wrong table 10) Which of these was not a control variable in our investigation? a) Mass of chemical b) Final temperature c) Initial temperature d) Volume of chemical e) Concentration of acid 11) What is the name for the minimum amount of energy need to particles need to react when they collide? a) Zero point b) Double impact c) Activation energy d) Attack force e) Maximum conviction f) Hard target 12) What word means "the chemicals that are used up in the reaction"? a) Products b) Reactants c) Molecule d) Elements e) Ingredients f) Acids 13) What word means "the chemicals made in the reaction"? a) Products b) Reactants c) Molecules d) Elements e) Ingredients f) Acids 14) What is thermal energy measured in? a) Joules b) Degrees c) Newtons d) Calories e) Partons 15) Is this reaction profile exothermic or endothermic? a) Exothermic b) Endothermic 16) IS this reaction profile exothermic or endo thermic? a) Exothermic b) Endothermic 17) Is this reaction profile exothermic or endothermic? a) Exothermic b) Endothermic

C1 Topic 5 Energy Changes

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