1 / 11

Day 9 Item Analysis

Day 9 Item Analysis. Which of the following is an example of solar energy being converted into chemical energy? A Plants producing sugar during the day B Water evaporating and condensing in the water cycle C The sun unevenly heating Earth’s surface

hiram-norris
Download Presentation

Day 9 Item Analysis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Day 9 Item Analysis

  2. Which of the following is an example of solar energy being converted into chemical energy? A Plants producing sugar during the day B Water evaporating and condensing in the water cycle C The sun unevenly heating Earth’s surface D Lava erupting from volcanoes for many days

  3. The correct answer is A • Chemical energy is found in the bonds between atoms. Sugar is a chemical compound which contains chemical energy. Through photosynthesis, plants take solar energy and convert it into sugars which contain chemical energy.

  4. Why is the sum of the products’ energy in this reaction less than the sum of the reactants’ energy?A Energy is given off as heat.B The products absorb available energy.C Energy is trapped in the reactants.D The reactants’ energy is less than themelting point of glucose.

  5. The correct answer is A • Energy is always conserved. In a chemical reaction if the energy on the reactant side is greater than that of the product side, then energy is released as heat and the reaction is referred to as exothermic.

  6. An inventor claims to have created an internal combustion engine that converts 100 kJ of chemical energy from diesel fuel to 140 kJ of mechanical energy. This claim violates the law of conservation of — A momentum B inertia C energy D mass

  7. The correct answer is C • Energy is always conserved. You can’t create more energy than you have initially. Energy is simply converted from one form to another.

  8. What is the potential energy of the rock?A 59,900 joulesB 64,600 joulesC 93,100 joulesD 121,600 joules

  9. The correct answer is C According to the formula chart The rock has a mass of 95 kg and is at a height of 100 m. The acceleration due to gravity is 9.8 m/s2 according to the formula chart Then GPE = 95 kg x 9.8 m/s2 x 100 m = 93100 J

  10. The diagram shows an electric motor lifting a 6 N block a distance of 3 m. The total amount of electrical energy used by the motor is 30 J. How much energy does the motor convert to heat?A 9 J B 12 JC 18 J D 21 J

  11. The correct answer is B Energy is always conserved. You apply 30 J of energy. Some of the energy is used to lift the 6N object 3m According to the formula chart Work = 6N x 3m = 18 J of work. The remaining energy is converted to heat. 30 J – 18 J = 12 J

More Related