Balloon, why didn’t they react right away?

d. will an exothermic reaction increase or decrease the temperature?

go back to the simulator:
endothermic chemical reactions: click on the endothermic tab to begin.

7. before clicking the orange button to “break bonds.” how has the energy diagram changed? what is noticeable about the reactants in particular?

8. click the orange button to “break bonds,” then “make bonds,” and then “overall reaction.” based on the size of the arrows, is more energy absorbed to break bonds or released when bonds are formed?

9. the prefix “endo” means internal or within and the energy change in the reaction is positive, how does this relate to the endothermic chemical reaction that you just observed?

10. if you observed a chemical reaction take place in a container and the container got very cold, would this be an endothermic or an exothermic reaction?

11. comparing exothermic and endothermic reactions: when the sugars and carbohydrates formed by plants sit for millions of years they are rearranged into fossil fuels like coal, oil, and natural gas.
a. consider a combustion reaction of sugar:
c12h22o11 + 12o2 à 12co2 + 11h2o

just like burning fossil fuels, is this exothermic or endothermic?

b. consider photosynthesis to make sugar:

12co2 + 11h2o à c12h22o11 + 12o2

i. is this reaction exothermic or endothermic?

ii. in photosynthesis, where does the energy for the reaction come from?

c. how do you think the energy of the reaction in 11a compares to the energy of the reaction in 11 b?

Is a measure of the resistance to flow. a high liquid has a high resistance to flow and flows slowly. the ancients thought everything in the world was made of 4 we now know that there are 94 naturally occurring and scientists have created another 24 i am certain they will create even more. honey flows slowly because it has a high to flowing. a can be separated by physical means because it contains more than one pure substance and 2 pure substances are not chemically bonded to each other. a cannot be separated by physical means. all matter is made up of all elements are with the same number of protons. if it is just a single or many bonded together, if all of them have the same number of protons, it is an element. in a piece of pure iron metal, all the are joined together, that piece of iron metal is called elemental iron. a single of iron is called elemental iron. a mixture has differences from place to place. we might need a microscope to see them or they might be obvious to the unaided eye. there are surfaces separating it into different phases. a mixture is the same everywhere. it is uniform. there are no surfaces separating it into different phases. if different kinds of atoms (different elements) are bonded together by their electrons, it is called a there are physical means of to isolate the different pure substances in a mixture and there are chemical means of to isolate the different elements in a compound. 1. element 2. compound 3. mixture 4. heterogeneous 5. homogeneous 6. pure substance 7. atoms 8. separation 9. viscosity 10. resistance