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Chemistry Chapter 1
Terms in this set (16)
Why should the study of chemistry be important to everyone?
It helps people learn more about everything in the universe and the changes that it undergoes
Define substance and give 2 examples of things that are substances.
Matter that has a definite and uniform composition. Ozone and chlorofluorocarbon
How do ozone layers form and why is it important?
Ozone is formed when oxygen gas is exposed to ultraviolet radiation in the upper region of the stratosphere. It protects us from the harmful UV rays
Why were chlorofluorocarbons developed and how are they used?
They were developed as a safe, non-toxic and stable;e coolant to ammonia. They are used as coolants in refrigerators and air conditioners as well as plastic foams and propellants in spray cans
If cells have the ability to repair themselves after exposure to UVB, why do the increasing levels of UVB in the atmosphere concern scientists?
If UVB rays reach a certain level then cells may not be able to repair, causing organisms to die
Why did the concentration of CFC's increase in the air?
Because they were being used increasingly more by people wanting refrigerators and air conditioners. Since CFC's are stable, they do not react with other substances in the atmosphere, so their increased use overtime increased their concentration in the atmosphere
Why was it important for Dobson's data to be confirmed by satellite photos?
It helped convince scientists of the problem by providing 2 separate data sources that supported the same conclusions
Why are there different branches of chemistry?
Because there are so many different types of matter to study
Why do scientists use mass instead of weight for their measurements?
Because the effect of gravity isn't always constant
Why is it important for chemists to study changes in the world at a submicroscopic level?
Because matter at the submicroscopic level are easier to model.
What are three models that scientists use, and why each are models useful?
Materials and structure used to build buildings, a new airplane design before it's mass is produced and atoms
How would your mass and weight differ on the moon?
Mass would not be affected but weight will be much less, 1/6th of my weight
If you put a scale in an elevator and weigh yourself as you ascend and then descend, does the scale have the same reading in both instances?
The scale would show a lower weight at the highest point and a higher weight at the lowest point. This is because gravity's effect is less because the elevator is accelerating the opposite direction of gravity
Why do scientists not use a standard set of steps for every investigation they conduct?
It is their own point of view
Give an example of quantitive data and qualitative data.
Quantitive-mass of an object
Qualitative-color of an object
Jaques Charles described the direct relationship between temperature and volume of all gases at constant pressure. Should this be called Charle's law or Charle's theory? Explain.
Charle's law because it was studied by many other scientists
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