1) Does exothermic mean that energy is taken in to the system or released to the surroundings?  a) Taken in to the system 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 is the name for the minimum amount of energy needed for particles to react when they collide? a) Zero point b) Double impact c) Activation energy d) Attack force e) Maximum conviction f) Hard target 10) What word means "the chemicals that are used up in the reaction"? a) Products b) Reactants c) Molecule d) Elements e) Ingredients f) Acids 11) What word means "the chemicals that are made in the reaction"? a) Products b) Reactants c) Molecules d) Elements e) Ingredients f) Acids 12) What is thermal energy measured in? a) Joules b) Degrees c) Newtons d) Calories e) Kelvin 13) Is this reaction profile exothermic or endothermic? a) Exothermic b) Endothermic 14) Is this reaction profile exothermic or endothermic? a) Exothermic b) Endothermic 15) Is this reaction profile exothermic or endothermic? a) Exothermic b) Endothermic 16) Is this reaction exothermic or endothermic? a) Exothermic b) Endothermic 17) Is this reaction exothermic or endothermic? a) Exothermic b) Endothermic 18) Is this reaction exothermic or endothermic? a) Exothermic b) Endothermic

Exothermic and Endothermic reactions

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