Go to the Quizzes Page Chemical Reactions 0% 3 Created by AbuBakrShalabi Please write your name and email to receive your certificate. 1 / 20 During a reaction, atoms are created destroyed rearranged 2 / 20 Which is NOT an indication of a chemical change? Shape Change Production of light Formation of a precipitate Temperature Change 3 / 20 The reactants in the image above are: 2 H2O and CO2 CH4 and 2 O2 All of these are reactants All of these are products 4 / 20 If a chemical reaction is EXOTHERMIC, the temperature would.... Decrease Change in shape Stay the same Increase 5 / 20 Which is an example of a chemical reaction? flour and sugar mixed in a bowl paper cut into small pieces cookies baking in an oven chocolate melting in a pan 6 / 20 A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true? It is an exothermic reaction Energy is released from the reaction into the surrounding. It is an endothermic reaction The temperature did not change. 7 / 20 What is the right part of a chemical equation called? Reactants Yields Products Chemical Equation 8 / 20 Which of the following models best demonstrates a balanced chemical equation? F J H G 9 / 20 How many atoms in all are in a molecule of serotonin? C10H12N2O 10 4 25 12 10 / 20 In a chemical reaction, 4 grams of sodium must combine with how many grams of chlorine to produce 10 grams of table salt? 10 grams 8 grams 4 grams 6 grams 11 / 20 In order for an equation to be balanced, there must be ... a greater mass on the reactant side elements with the same atomic # on both sides an equal amount of atoms on both sides a greater mass on the product side 12 / 20 How many total atoms are in this compound? 3 5 2 6 13 / 20 The law of conservation of mass states that _________. the total mass of the reactants equals the total mass of the products the mass is not conserved the total mass of the reactants is less than the total mass of the products the total mass of the reactants is greater than the total mass of the products 14 / 20 Which statement is not a description of a chemical reaction? Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker. A liquid is heated in the sun and half of it evaporates. A solid is dropped into a beaker of liquid and a gas is released. A solid is dropped into a beaker of liquid and an explosion occurs. 15 / 20 When a copper wire was dipped into a beaker containing a colorless solution, the solution turned blue and the beaker felt warmer. Which statement is TRUE about the type of this chemical reaction? endothermic reaction, because thermal energy was absorbed exothermic reaction, because thermal energy was released endothermic reaction, because thermal energy was released exothermic reaction, because thermal energy was absorbed 16 / 20 Which are the reactants? Mg and MgO MgO O and MgO Mg and O 17 / 20 Check ALL the boxes that show the signs of a chemical change. air gas (bubbles) produced smell color change 18 / 20 A chemical reaction is when... Atoms and molecules break apart and regroup to form new products Atoms and molecules are destroyed Atoms and molecules are created 19 / 20 What is the left part of a chemical equation called? Yields Reactants Chemical Equation Products 20 / 20 In an endothermic reaction, energy is _________. stay the same released absorbed in random directions Your score is 0% Restart quiz Go to the Quizzes Page