Consider the production of water by reacting hydrogen gas and oxygen gas: 2H_2 (

Question

Consider the production of water by reacting hydrogen gas and oxygen gas: 2H_2 (g) + O_2 (g) rightarrow 2 H_2 O (g) What is the purpose of the numbers in red? To show that all of the atoms in the reactants is the same as the all of the atoms in the products; only the their arrangement and connectivity are different. B)To show that oxygen is the limiting reactant C) To show that two molecules of hydrogen would react with each oxygen molecule to produce two molecules of water D) (a) and (c) The reaction mentioned in question 1 is exothermic. What does that mean? A) External energy is added to the system to make the products B) The products have a higher internal potential energy than the reactants The internal interactions (i.e. covalent bonds) in water molecules C) (products) are stronger than the internal Interactions (I.e. covalent bonds) in hydrogen and oxygen molecules (reactants) D) All of the above What must happen before two molecules (ex: O_3 and NO) can have a successful chemical reaction to form products (ex: O_2 and NO_2)? A) O_3 and NO molecules must collide with each other through random motion B) O_3 and NO molecules must have the proper orientation (due to random motion) during the collision to ensure that the nitrogen atom in NO collides with the oxygen atom in O_3 O_3 and NO molecules must have enough energy when colliding to overcome the energetic barrier (activation energy) D) All of the above Higher temperature usually increases the reaction rate. How is this accomplished? A) Higher temperature will increase the kinetic energy of the molecules, allowing them to collide more frequently and with greater force B) Higher temperature will decrease the activation energy, allowing molecules to react faster C) Higher temperature will increase the configurational effectiveness, making making it easier for molecules to collide in the proper orientation D) all of the above What can be said about a chemical reaction that has reached equilibrium? A) The concentration of reactants is equal to the concentration of products B) The rate of the forward process is equal to the rate of the reverse process C) All of the reactants have completely converted to the products D) The forward reaction stops, and only the reverse reaction takes place

Explanation / Answer

Question 1: Answer C;

The numbers in red describe the quantitative relationships among substances as they participate in chemical reactions are known as reaction stoichiometry.

Question 2: Answer C;
The internal interactions (i.e. covalent bonds) in water molecules (products) are stronger than the
internal interactions (i.e. covalent bonds) in hydrogen and oxygen molecules (reactants)

Question 3: Answer D; All of the above

Question 4: Answer A;

Question 5: Answer B;

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