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- Milk left outside at room temperature spoils faster than milk kept cold in the refrigerator. Explain this observation in terms of how temperature affects the speed of a chemical reaction.20. Dissolving the salt potassium nitrate in water is an endothermic reaction. What would be observed if potassium nitrate was dissolved in water? a) The water would get very hot. b) The water would get colder. c) The salt would float to the top of the water. d) Bubbles of hydrogen gas would be produced.In experiment #7, you observed the formation of carbon dioxide by reacting baking soda with vinegar. Why was it not possible to relight the candle? A. Carbon dioxide is heavier than air so it stays in the beaker preventing the candle from relighting. B. Carbon dioxide is lighter than air so it escaped from the beaker and the candle should have relit. C. Carbon dioxide is heavier than air so it stays in the beaker and the candle should have relit. D. Carbon dioxide is lighter than air so it escaped from the beaker preventing the candle from relighting.
- Reaction 1: 47.2 seconds Reaction 2: 90.2 seconds Reaction 3: 93.1 seconds Reaction 4: 196.5 seconds Reaction 5: 78.4 secondsSuppose a pair of chemical compounds A and B can react in two different ways: Reaction 1 gives product C. A+B → C A+B-D Reaction 2 gives product D. The following facts are known about the two reactions: • Reaction 1 is exothermic and Reaction 2 is endothermic. • If a reaction vessel is charged ("filled") with A and B, then at first D is produced faster than C. Use these facts to sketch a qualitative reaction energy diagram for both reactions. Note: because these sketches are only qualitative, the energies don't have to be exact. They only have to have the right relationship to each other. For example, if one energy is less than another, that fact should be clear in your sketch. energy Reaction 1 reaction coordinate energy Reaction 2 reaction coordinate 0 L4 A # BaDo chemical reactions usually occur in a single step?
- 4. Two chemicals A and B are combined to form a chemical C. The rate, or velocity, of the reaction is proportional to the product of the instantaneous amounts of A and B not converted to chemical C. Initially, there are 40 grams of A and 50 grams of B, and for each gram of B, 2 grams of A is used. It is observed that 10 grams of C is formed in 5 minutes. a. How much is formed in 20 minutes? b. What is the limiting amount of C after a long time? c. How much of chemicals A and B remains after a long time? d. At what time is chemical C half-formed? e. Plot the Solutions Using GeoGebra. f. Find the solution using Wolfram/ CAS calculator of GeoGebra. g. Find the numerical solution using numerical Solver/Python. h. Plot both the analytical solutions and Numerical Solutions together. Note : Use sliders in graphs wherever is requiredIn a chemical reaction, how do the reactants and products relate to the initial and final states?A chemical reaction can have only one rate-limiting step. Do you agree or disagree? Justify your answer.
- 3 Magnesium metal reacts rapidly with hydrochloric acid in an open container, producing aqueous magnesium chloride and hydrogen gas. Which of the following would be most useful in measuring the rate of this reaction? a. the mass of the beaker and its contents b. the volume of the solution c. the concentration of the chloride ion d. the colour of gas produced10. Which of the following will hasten the rate of a reaction? * A. adding a catalyst B. diluting the reactants C. decreasing the surface area of a reactant D. decreasing the temperature of the reaction. 11. How many hydrogen atoms are there in seven (7) molecules of hydrogen gas? A. 2 H atoms B. 14 H atoms C. 7(6.022 x 10^23) H atoms D. 7/(6.022 x 10^23) H atoms 12. Choose the nonrenewable resourced that best match this description: less expensive * A. fossil fuel B. nuclear energy 13. If you calculate the maximum amount of product that could be obtained in a chemical reaction, you are calculating the A. actual yield B. experimental yield C. percent yield D. Okay theoretical yield 14. An increase in temperature will result in A. a less energetic collision B. a lower activation energy C. improved orientation of colliding particles D. more molecules that can overcome the activation energy 15. A collision is said to be effective if it has A. a reaction mechanism B. large colliding…Suppose a pair of chemical compounds A and B can react in two different ways: A+B - C Reaction 1 gives product C. A+B -D Reaction 2 gives product D. The following facts are known about the two reactions: • Reaction 1 is endothermic and Reaction 2 is exothermic. • If a reaction vessel is charged ("filled") with A and B, then at first D is produced faster than C. Use these facts to sketch a qualitative reaction energy diagram for both reactions. Note: because these sketches are only qualitative, the energies don't have to be exact. They only have to have the right relationship to each other. For example, if one energy is less than another, that fact should be clear in your sketch. Reaction 1 Reaction 2 energy energy A + B A + B reaction coordinate reaction coordinate