Go to the Quizzes Page Balancing Chemical Equations 0% 3 Created by AbuBakrShalabi Click "Watch Now" to watch the video. Then, answer the following questions: Please write your name and email to receive your certificate. 1 / 20 In the balanced equation 2H₂ + O₂ → 2H₂O, what is the coefficient of hydrogen (H) on the product side? 1 3 4 2 2 / 20 Which statement best describes the law of conservation of energy? Energy can't be transferred between the system and the surroundings. The amount of energy released by a system must be more than that absorbed by the surrounding. The total energy absorbed and released from a chemical reaction stays the same. The total energy absorbed and released from a chemical reaction varies. 3 / 20 What are the missing coefficients for the chemical equation below? P + O2 → P2O5 4 , 5 , 2 1 , 3 , 4 2 , 2 , 5 2 , 5 , 4 4 / 20 A chemical reaction happens when ___________. existing atoms in the reactants are destroyed new atoms are created in the products new bonds are formed to create complex compounds existing bonds break and the atoms rearrange to form new bonds 5 / 20 What is the coefficient in a balanced chemical equation? A large number written in front of a chemical formula A small number written behind a chemical formula An element on the right side of the equation An element on the left side of the equation 6 / 20 If 5 grams of magnesium (Mg) react with oxygen (O₂) to form magnesium oxide (MgO), the total mass of the magnesium oxide produced will be: Exactly 5 grams. More than 5 grams. Less than 5 grams. Impossible to determine without knowing the amount of oxygen used. 7 / 20 What is the Law of Conservation of Mass? The total energy absorbed and released from a chemical reaction varies. Energy can be neither created nor destroyed. Matter can be neither created nor destroyed in a chemical reaction. The total charge of a system must remain constant. 8 / 20 When balancing the equation Fe + S → FeS, what coefficient is needed in front of FeS? 3 It cannot be balanced. 2 1 9 / 20 When balancing an equation, you can change the subscripts in the chemical formulas. True False 10 / 20 In a balanced equation, the total number of atoms of each element must be the same on both sides of the reaction arrow. False True 11 / 20 What does balancing a chemical equation mean? Changing the names of the reactants and products Replacing elements with different ones Adding heat to a reaction Making sure the number of atoms of each element is the same on both sides of the reaction arrow 12 / 20 Why is it important to balance a chemical equation? To make the equation look neat To calculate the rate of reaction To identify the reactants and products To represent the Law of Conservation of Mass 13 / 20 What is the coefficient needed in front of O2 to balance the following equation? CH4 + O2 → CO2 + 2H2O 3 4 2 1 14 / 20 What is the balanced equation for the reaction between methane (CH4) and oxygen (O2) to produce carbon dioxide (CO2) and water (H2O)? CH4 + 2O2 → 2CO2 + H2O CH4 + O2 → CO2 + 2H2O CH4 + 2O2 → CO2 + 2H2O CH4 + O2 → CO2 + H2O 15 / 20 When balancing an equation, you can: Add or remove atoms from the equation Change the chemical formulas of the reactants and products Change the coefficients in front of the formulas None of the above 16 / 20 In the unbalanced equation: Fe + O2 → FeO3 how many Fe atoms are on the reactant side? 1 It depends on the amount of Fe used 2 There is no Fe in the equation 17 / 20 In a closed system undergoing a chemical reaction, the total mass of the reactants must be: Unrelated to the total mass of the products. Equal to the total mass of the products. Greater than the total mass of the products. Less than the total mass of the products. 18 / 20 What are the missing coefficients for the chemical equation below? Ag2O → Ag + O2 2 , 4 , 1 1 , 2 , 3 2 , 2 , 2 5 , 4 , 2 19 / 20 Which of the following equations is balanced? C3H8 + 5O2 → 3CO2 + 4H2O 2Na + 2Cl2 → 2NaCl H2 + O2 → H2O Fe + 2HCl → FeCl2 + H 20 / 20 In the balanced equation N₂ + 3H₂ → 2NH₃, how many atoms of hydrogen (H) are on the reactant side? 4 2 6 3 Your score is 0% Restart quiz Go to the Quizzes Page