DCP #3 Review
1. Find a picture of an animal with an adaptation and explain how the adaptation is going to help that organism survive in it's environment.
Polar bears have white fur so they can blend in wight heir environment. This helps them stay alive because predators can't see them against the ice/snow.
2. List 2 ways humans have caused changes in populations of organisms.
Humans hunt for animals, lowering their population and factories harm ecosystems (Dirty air, can't blend in).
3. How have humans negatively affected various populations?
For polar bears, the ice in their home is melting because of global warming; that's killing them off. Also, smoke from factories may make environments darker, making the lighter organisms easier for predators to spot.
4. What would happen to other organisms in a marine food web if human impact negatively affected one type of organism?
That would make whatever that organism eats overpopulate because there's nothing to manage the numbers. Also, the organisms that eat the affected organism can die because there's not enough, or even get diseases from them.
5. How has over harvesting or over fishing negatively affected the aquatic ecosystem?
There's more sea life being take than is being replaced. Over time a lot of aquatic organisms have most likely died off. In the long run, it could cause more organisms to be endangered.
6. What is bacteria's role in the ecosystem? How do they obtain nutrients?
Bacteria is a decomposer. They get their nutrients from dead organisms. They break them down and use them to help other organisms thrive/survive.
Humans hunt for animals, lowering their population and factories harm ecosystems (Dirty air, can't blend in).
3. How have humans negatively affected various populations?
For polar bears, the ice in their home is melting because of global warming; that's killing them off. Also, smoke from factories may make environments darker, making the lighter organisms easier for predators to spot.
4. What would happen to other organisms in a marine food web if human impact negatively affected one type of organism?
That would make whatever that organism eats overpopulate because there's nothing to manage the numbers. Also, the organisms that eat the affected organism can die because there's not enough, or even get diseases from them.
5. How has over harvesting or over fishing negatively affected the aquatic ecosystem?
There's more sea life being take than is being replaced. Over time a lot of aquatic organisms have most likely died off. In the long run, it could cause more organisms to be endangered.
6. What is bacteria's role in the ecosystem? How do they obtain nutrients?
Bacteria is a decomposer. They get their nutrients from dead organisms. They break them down and use them to help other organisms thrive/survive.
8. Find a picture of a parasite/host relationship and explain which organism is the parasite and which one is the host.
The tick is the parasite and the dog is the host because the dog is the one being harmed while the tick is benefitting from it.
9. Describe a predator/prey relationship in the food web below.
A lion and a wildcat are an example of a predator/prey relationship because they are both consumers and the lion gets its energy from the other animal.
10. How many atoms are present in the molecule below?
24~ Carbon=6 Hydrogen=12 Oxygen=6
11. How do you know by looking at a bohr model which elements are in the same group?
Groups are based on how many valence electrons an atom of an element has. You can find this by counting the number of electrons on the outermost energy level. Numbers with the same number of valence electrons are in the same group.
12. What information is given when we have the chemical formula for a substance?
How many atoms of an element are present.
13. Describe evidence of a chemical reaction.
Please - precipitate
Excuse - Endothermic or extothermic reaction (heat)
Burps - Bubbles
Sneezes - Smells
Coughs - Color change
Or - Oxidation
Chunks - Combustion
Groups are based on how many valence electrons an atom of an element has. You can find this by counting the number of electrons on the outermost energy level. Numbers with the same number of valence electrons are in the same group.
12. What information is given when we have the chemical formula for a substance?
How many atoms of an element are present.
13. Describe evidence of a chemical reaction.
Please - precipitate
Excuse - Endothermic or extothermic reaction (heat)
Burps - Bubbles
Sneezes - Smells
Coughs - Color change
Or - Oxidation
Chunks - Combustion
14. Does the equation below follow the Law of Conservation of Mass?
No, because the equation isn't balanced. There are 2 hydrogen on both sides, but only 2 oxygen on the left and 1 oxygen on the right.
15. How do valence electrons tell us how reactive an element is?
All elements want their outer shell to be complete. Elements with only one valence electron just need one more to complete their outer shell, so they are the most reactive. Also, valence elements with seven valence electrons only need one more so they're also very reactive. Elements with eight valence electrons don' need to give or take anymore so they're not reactive.
16. Describe examples of chemical and physical changes in the digestive system.
Chemical- The acids in your stomach breaking down food
Physical- Your teeth biting the food to break it into smaller pieces
All elements want their outer shell to be complete. Elements with only one valence electron just need one more to complete their outer shell, so they are the most reactive. Also, valence elements with seven valence electrons only need one more so they're also very reactive. Elements with eight valence electrons don' need to give or take anymore so they're not reactive.
16. Describe examples of chemical and physical changes in the digestive system.
Chemical- The acids in your stomach breaking down food
Physical- Your teeth biting the food to break it into smaller pieces