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