Molecules
An organic molecule always contains what element?
What is Carbon
What does pH describe?
The amount of hydrogen ions in a substance
LD50 describes what?
The dose of a chemical that will kill 50% of a population.
How could you fix a lake that has been acidified by acid rain?
through liming- adding calcium carbonate
What effect did DDT have on bird species?
Made their eggs squishy and brittle so most broke before babies could hatch.
The three types of organic molecules our body needs most.
What are Carbohydrates, Lipids and Proteins
If a substance has a pH of 10, is it an acid or a base?
Base
Most air pollution is the result of what process?
Burning Fossil Fuels
What are the products in a neutralization reaction?
water and salt
Substances in the environment that can be broken down by bacteria are called...
Biodegradable
What are carbohydrates.
Vinegar has a pH of 4. Dishsoap has a pH of 8. How much more acidic is vinegar than dishsoap?
10,000
What material is landfills lined with so that water and chemicals don't leach through?
Clay
Name 2 chemical indicators of a healthy aquatic ecosystem
High dissolved oxygen, low dissovled nitrates
Why isn't combustion a good way to get rid of Earth's waste?
byproducts of combustion include carbon monoxide, dioxins and nitrogen oxides which cause air pollution, and CO2 which is a greenhouse gas.
Inorganic compounds are used to create these types of substances.
Enzymes and Vitamins
A substance is a good conductor of electricity, turns litmus paper red and tastes sour. This would be classified as what type of substance?
Acidic
Name 2 examples of non point sources of pollution.
Agricultural runoff, urban runoff, garbage, air pollution, soil erosion
What compound is responsible for mixing with water to create acid rain?
Sulfur Dioxide
What is a Bioindicator Species?
A species used to assess the healthiness of an environment, because they are sensitive to changes in the environment
This is the definition of an enzyme.
Give two examples of basic substances.
Any cleaning products
A solution contains 9 mg of salt dissolved in 3 L of water. What is the concentration in PPM?
3 ppm
Describe what happens during an algae bloom
Runoff puts nitrates/phosphates into water--> explosion in algae --> algae dies --> decomposers use up all O2 --> other organisms die
What is Active Transport of molecules?
When the particles are moving against the concentration gradient- from low concentration to high concentration.