Worksheet to accompany Bill Nye’s “Chemical Reactions” Video Directions: As you view the DVD, fill in the blanks in the “knowledge” section. If you need help, use the word bank. If you don’t get them all done during the video, go back after it’s over and fill in all blanks. When you’ve filled in the “knowledge” section, answer the high-level thinking questions on the back of this sheet.
Word Bank: (some words may be used more than once, others not at all)
Atoms Molecules Chemical Carbon Dioxide Combine Oxygen Hydrogen Collide Table Salt Sodium Chlorine 92 Exothermic 116 Endothermic Reacts Metal Copper Barium Strontium Dynamite Salts Element Methane Lithium
Knowledge
Everything is made of .
Iron rusts when it’s combined with .
Water is made by the reaction between and . Burning steel wool was an reaction.
Engines work by combining gasoline and .
Mixing vinegar and baking soda produces .
Pure Sodium vigorously with water.
Another name for Sodium Chloride is . Sodium Chloride is made of and . Fireworks twinkle bright colors when react with oxygen. The yellow color in fireworks is caused by .
The metal gives fireworks there blue color.
Chemical reactions happen when atoms with other atoms. The Periodic Table contains “naturally occurring” elements.
Alfred Nobel is famous for the invention of .
The athletic cold pacs are an example of an reaction.
Directions: These questions are to be answered in a complete, grammatically correct sentence that makes sense and would be readable and understandable by another student.
Comprehension
Explain the difference between an “exothermic” and an “endothermic reaction”. Describe what a “pyrotechnic” does for a living.
Application
Why can the reaction between Vinegar and Baking Soda be used to make a fire extinguisher?
Analysis
Why are the two toxic chemicals; Sodium and Chlorine, made safe when they’re combined as salt?
Synthesis
Predict the compound (by name and formula) that would be formed by combining Strontium metal with Oxygen.
Evaluation
Which profession would be safer; fireman or pyrotechnic? Support your opinion with a minimum of three reasons.

Red’s momentum vector before the collision is green’s momentum vector after the collision. question 1 options: equal to shorter than longer than question 2 (1 point) saved since green bounces off red, this must be an collision. question 2 options: explosion elastic inelastic question 3 (1 point) red transfers of its momentum to green during the collision. question 3 options: none all little most question 4 (4 points) why does red transfer all its momentum to green? back up your answer with information from the simulation. write at least 2 sentences. question 4 options: skip toolbars for . more insert actions. more text actions. more paragraph style actions. question 5 (1 point) now make red much heavier than green. answer the questions below to describe how both red and green behave after the collision. question 5 options: slowed down sped up kept the same velocity question 6 (1 point) green sped up during the collision as it question 6 options: gained momentum from red lost momentum to red maintained a constant momentum. question 7 (1 point) after the collision . . question 7 options: both green and red moved to the right. both green and red stopped as they have lost all momentum. red stopped and green moved to the right. red bounced off green and went to the left. green moved to the right. question 8 (4 points) only some of red’s momentum was transferred to green. why did this occur? back up your answer with information from the simulation. write at least 2 sentences. question 8 options: skip toolbars for . more insert actions. more text actions. more paragraph style actions. question 9 (1 point) now make red much lighter than green. answer the questions below to describe how both red and green behave after the collision question 9 options: green sped up after the collision therefore it must have gained momentum. green sped up after the collision therefore it must have lost momentum. green slowed down after the collision therefore it must have gained momentum. green slowed down after the collision therefore it must have lost momentum. question 10 (1 point) since green gained momentum, red had to have momentum because you cannot create or destroy momentum. question 10 options: gained lost kept the same amount of question 11 (1 point) since green was so much and harder to move, it caused red to bounce back to the left giving red . question 11 options: heavier . . . . positive lighter. . . . negative lighter. . . . positive heavier . . . . negative question 12 (4 points) now, click on more data at the bottom of the sim. play with different numbers for the masses and starting velocities. you can even make the starting velocities negative! tell me one thing you discovered by adjusting the speeds and masses. write at least 2 sentences. be specific and use words like velocity, momentum, mass, increased, decreased, etc. 13. true or false: when red and green collide, they stick together. question 13 options: true false question 14 (1 point) the velocity of red & green after the collision is the velocity that red started off with. question 14 options: larger than smaller than equal to question 15 (1 point) the velocity after the collision was less because the mass has question 15 options: stayed the same decreased increased question 16 (1 point) the momentum before the collision was the momentum after the collision. question 16 options: larger than smaller than equal to conclusions question 17 (4 points) how are elastic and inelastic collisions different? give two or more ways. your answer should have at least 2 sentences. question 18 (4 points) give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.