Ecosystems
(K/U) 1. The size of a population that can be supported indefinitely by the resources and services of an ecosystem is known as?
A. Carrying capacity
B. Ecological footprint
C. Exponential limit
D. Niche
A) Carrying capacity
(K/U) 1. Which of the following is a chemical property?
A. density
B. reactivity with water
C. solubility
D. boiling point
B) Reactivity with water
(K/U) 1. select the correct option
Which instrument does an astronomer use to analyze the spectrum of a star?
A. A refracting Telescope
B. A reflecting telescope
C. A radio telescope
D. A spectroscope
D) a spectroscope because they measure the spectrum of light and this is the device rear astronomers use to analyze the spectrum of a star.
(K/U) 1. what is an insulator?
an insulator is a material that is a poor conductor of electricity or heat like plastic, glass, and wood. these are all examples of insulators.
(T/I) 2. Explain how acid precipitation could affect biodiversity.
Nitrogen oxides and sulfur dioxide is produced when fossil fuels are burned and when these gases combine with water in the atmosphere, nitric acid and sulfuric acid are produced. these acids can travel far distances due to the wind and this can be bad for all living things in many ways. there are different precipitation to acid like acid snow, acid rain, and acid particles and gases.
(T/I) 2. Compare elements and compounds.
an element is a pure substance that cannot be broken down into simpler parts by chemical methods and a compound is also a pure substance made of two or more different elements that are chemically combined. they are both pure substances and a compound is just made up of different elements but they are chemically bonded.
(T/I) 2. Dark energy makes up most of the universe, yet its effects were not detected until the late 1990s. explain one reason why astronomers had not discovered this for so long.
Dark energy is a form of energy that takes on most of the universe. now this energy has the effect of increasing the expansion of the universe. this wasn't recognized until the 1990s because it was something very complex and when scientists found out that there was ab anti-gravity pull to the universe they couldn't understand it so they named it dark energy. astronomers still don't know much about this energy but they did observe that this energy is the cause of the expansion of the universe.
(T/I) 2. How many cells would you expect to find inside a 6V battery?
4 because each cell is 1.5 volts so 6V divided by 1.5V equals 4.
(C) 3.The rivet analogy is used to explain why humans should be concerned about losing biodiversity. provide another analogy to explain this concept.
an analogy like losing an important friend can also apply to this concept since we always depend on our one friend and they are very close to us and sometimes their existence cant mean much but when we lose them we can feel that we lost something very very important and we realize, that we should have been more grateful to them. the same rule applies here too. we don't acknowledge our biodiversity but at some point when it's gone, then we are going to think that we should have been more responsible with it and should have been grateful.
(C) 3. Explain what each of the following means and represents.
a. metals
b. non-metals
c. noble gases
d. alkali metals
e. alkaline earth metals
f. halogens
metals are hard, shiny, malleable, ductile, and are good conductors of heat and electricity.
non-metals are an element that is not shiny, malleable, ductile, and are a poor conductor of heat and electricity.
noble gases are the 18th group of the periodic table and are non-reactive non-metals.
alkali metals are the first element in the periodic table and are highly reactive. they are also soft.
alkaline earth metals are the second group in the periodic table and are highly reactive but less than alkali metals.
halogens are the 17th group in the periodic table and are highly reactive.
(C) 3. what did Edwin Hubble discover and how did he discover it?
Edwin Hubble discovered that the universe was expanding and he used the redshift relationship to help him come to this conclusion. he saw that all 46 galaxies that he was studying all had their spectral lines in the red. this means that the galaxies were moving away from earth and were continuously moving away. he then found out that this was because the universe was expanding.
(C) 3. explain what happens when a negatively charged object interacts with the ground?
when a charged object interacts with the ground, the electrons from the charged object transfers over to the ground and the object becomes neutral. this can also cause a positively charged object to also become neutral because the electrons that the ground collected from other charged objects can cause a positively charged object to become neutral.
(A) 4. Captive breeding programs are expensive. are they worth it?
in my opinion yes they are worth it because they maintain plants and animals in a controlled environment and with that comes responsibility and caring. so generally yes I think it is worth it.
(A) 4. Which compound would you expect to have a higher melting point? explain why.
Sulfur Dichloride or Calcium Chloride
I would expect calcium chloride to have a higher melting point because ionic compounds have higher melting points than molecular compounds and calcium chloride is an ionic compound. I know this because an ionic compound is a combination of metal and non-metal but a molecular compound is a combination of non-metal and non-metal.
(A) 4. identify three careers related to astronomy and space exploration.
astronauts, scientists, and engineers.
(A) 4. the current in an automobile headline, which is connected to a 12V battery, is 0.8 A. what is the resistance?
R= V/I
R= 12/0.8
R= 15 Ω
The resistance for the headline is 15 Ω.