Thank you l. Which of the following items are matter and which are not? a) a fla

Question

Thank you l. Which of the following items are matter and which are not? a) a flashlight b) sunlight c) an echo d) air at sea level e) air at the top of Mount Everest ANSWER: a) 2. How can a liquid be distinguished from a fine powdern what type of experiment or observation might be undertaken? 3. Do the terms element and atom mean the same thing? If not how do they differ? 4. Why do physical properties play a role in chemistry if they do not involve any chemical changes? 5. Identify the physical and chemical properties noted in the following when a piece of iron is exposed to air it corrodes, forming layer of red-brown that fakes off denser than the original All ecules attract each other to some extent, and the attraction decreases distance between particles increases. Based on this idea, which state would you expect interactions between particles, solids, liquids or gases? precise, both, or neither). 7. Complete the following statement: Data that have a small random error may be (accurate, 8. Two golfers are practicing shots around a putting green. Each golfer takes 20 shots. Golfer I has 7 shots within I meter of the hole, and the other 13 shots are scattered around the green. Golfer 2 has 17 shots go into a small sand trap near the green and three just on the green near the trap. Which golfer is more precise? Which is more accurate? 9. What is the difference between a hypothesis and a question? 10. What a law of nature? Are al scientific laws examples ofa law of nature? is Page 11

Explanation / Answer

a) Flashlight – matter (It has weight and occupies space, because a typical flashlight consists of a light bulb mounted in a reflector, a transparent cover to protect the light source and reflector, a battery, and a switch.)

b) Sunlight - not matter (it does not have a mass. Sunlight is made up of photons formed into light waves)

c) An echo - not matter (it does not have a mass. Echo is a reflection of sound that arrives at the listener with a delay.)

d) Air at sea level- matter (It has weight and occupies space. Air is composed of oxygen, nitrogen, argon, and few other smaller elements.)

e) Air at top of mount Everest- matter (It has weight and occupies space. There are less molecules and atoms of air, from sea level.)

2) Fine powder doesn't flow; it gets poured in, and then sits as it is. Liquids, will have a much larger degree of motion in its particles powder is a dry.

3) Element - An element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing a single proton and a single electron.

Atom - the smallest amount of an element. Atoms are composed of particles called protons, electrons and neutrons.

4) Physical properties determine how to handle chemicals. For example if we use low boiling point chemicals, we cannot heat up the reactions.

Physical properties also include color, which can be measured by spectrometry.

We can recognize chemicals from each other by the physical properties (phase, color, smell, etc.).

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