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CEM 141_Chapter 1 Atoms (1) Questions & 100% Verified Correct Answers with complete solutions (Latest update CA$11.11   Add to cart
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CEM 141_Chapter 1 Atoms (1) Questions & 100% Verified Correct Answers with complete solutions (Latest update

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CEM 141_Chapter 1 Atoms (1) Questions & 100% Verified Correct Answers with complete solutions (Latest update

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  • August 15, 2024
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  • 2024/2025
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CEM 141:Chapter 1 Atoms
can be a drawing or graph or a diagram or an equation, physical,mental - ANS-Scientific Model

1.Claim(the target of your explanation)
2.Evidence (the data or scientific principle you are using to support your claim)
3.Reasoning (how the evidence support the claim) - ANS-Constructing a Scientific Explanation

the best available explanation of the existing evidence or data or observations - ANS-Scientific
Theory

A law describes the phenomenon(tells you what). A theory explains the phenomenon(tells you
why). - ANS-What is the difference between Law and Theory?

fact - ANS-An atom of hydrogen gas one proton

law - ANS-The force of attraction between masses is proportional to the product of the masses
and inversely proportional to the square of distance between them

hypothesis - ANS-If we add reagent x to a reaction will go faster

theory - ANS-Special relativity (time and space are not absolute but are relative to each other)

Claim:coffee cools down when milk is added
Evidence:because the temp. of the milky coffee is intermediated between the milk and the
coffee
Reasoning:The molecules at higher temps. collide with molecules at lower temps. and transfer
energy. Hot molecules tend to slow down and cold molecules tend to speed up. - ANS-Explain
why coffee cools down when milk is added

about 0.1nanometer (1*10^-9) - ANS-How big do you think an atom (H) is?

The Greeks - ANS-Where did the original idea of atoms come from?

Not based on experimental evidence - ANS-Was this a scientific theory?

-Atoms not to be cut
-Elements:Earth, Fire, Air, and Water
-Atoms were thought to be in constant motion- based on watching the movement of specks of
dust in sunlight and that there was nothing or a "void" between them (later called the Brownian
Motion)
-Atoms of different elements had different shapes and sizes.

, -Believed that the shape of atoms determined their properties - ANS-Greeks

yes - ANS-Is the element the smallest unit of an atom?

91 (or 98) - ANS-How many elements are naturally occurring?

in the periodic table - ANS-How are elements ordered?

No atoms are too small to reflect light - ANS-Do atoms have color?

2 or more atoms bonded together - ANS-Molecule=

False, because elements can be divided into subatomic particles - ANS-Elements are
composed of small, indivisible, indestructible particles called atoms.(Dalton's Atomic Theory)
(True/False)

False, because of isotopes;same atom with different masses - ANS-All atoms of an element are
identical and have the same mass and properties.(Dalton's Atomic Theory) (True/False)

True - ANS-Atoms of a given element are different from atoms of other elements.(Dalton's
Atomic Theory) (True/False)

True - ANS-Compounds are formed by combinations of atoms of two or more
elements.(Dalton's Atomic Theory) (True/False)

True - ANS-Chemical reactions are due to the rearrangements of atoms, atoms(matter) are
neither created nor destroyed during a reaction.(Dalton's Atomic Theory) (True/False)

Electron - ANS-Which subatomic particle was discovered first?

JJ Thompson - ANS-Who discovered the electron?

Glass tube consisting of two electrodes under very low pressure. When a high voltage is applied
cathode emits "particles" that move toward anode. - ANS-Cathode ray tube

-"Particles" emerged from one disc(the cathode) and moved to the other(the anode)
-These particles could be deflected by electrical fields in a direction that would indicate they
were negatively charged
-(the particles could also be deflected by magnetic fields)
-The particles carried the electrical charge (-) that is if the ray was bent for example by a
magnetic field the charge went with it
-The metal that the cathode was made of did not affect the behavior of the ray- so whatever the
composition of the ray it appeared to be independent of the element that it came from -
ANS-Thompson's Experiment showed:

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