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