Phases of Matter?
particles are touching and not changing position
particles are touching but moving freely
particles do no touch but move freely
matter changes forms but the identity of the substance does not change is called
examples of physical change?
separating mixtures into
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Indicate whether each of the following statements concerning blood pH and the conditions of acidosis and alkalosis is true or false.
a. The primary blood buffer system is the buffer system.
b. Lower than normal levels of in the blood can cause respiratory acidosis.
c. Lower than normal levels of in the blood can cause metabolic acidosis.
d. The kidneys play a major role in regulating concentrations in the blood.
The Sun emits radiant energy (visible light, ultraviolet light, -rays, etc.) at a rate of . The Earth is from the Sun.
a. What is the intensity of this light, in watts per square meter, at the Earth's distance from the Sun? (State your answer to two significant figures.)
b. By what factor would you divide this intensity, if you wanted to calculate the value at Pluto's distance from the Sun? (On average, Pluto is roughly 40 times as far from the Sun as the Earth is.)
c. Suppose you are on a spaceship at Pluto's distance from the Sun. How large (in square meters) must your solar panels be, if they are to produce of electric power for your ship? (Assume that the panels can capture all the sunlight that strikes them and turn it into electricity.)