CEM 141: Chapter 1 Atoms-Question with Correct Answers/ Verified
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Course
Cem 141
Institution
Cem 141
can be a drawing or graph or a diagram or an equation, physical,mental -️️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) -️️Constructing a Scientif...
CEM 141: Chapter 1 Atoms-Question with Correct Answers/
Verified
can be a drawing or graph or a diagram or an equation, physical,mental - ✔️✔️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) - ✔️✔️Constructing a Scientific Explanation
the best available explanation of the existing evidence or data or observations - ✔️✔️Scientific
Theory
A law describes the phenomenon(tells you what). A theory explains the phenomenon(tells you why).
- ✔️✔️What is the difference between Law and Theory?
fact - ✔️✔️An atom of hydrogen gas one proton
law - ✔️✔️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 - ✔️✔️If we add reagent x to a reaction will go faster
theory - ✔️✔️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. - ✔️✔️Explain why
coffee cools down when milk is added
about 0.1nanometer (1*10^-9) - ✔️✔️How big do you think an atom (H) is?
The Greeks - ✔️✔️Where did the original idea of atoms come from?
, Not based on experimental evidence - ✔️✔️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 - ✔️✔️Greeks
yes - ✔️✔️Is the element the smallest unit of an atom?
91 (or 98) - ✔️✔️How many elements are naturally occurring?
in the periodic table - ✔️✔️How are elements ordered?
No atoms are too small to reflect light - ✔️✔️Do atoms have color?
2 or more atoms bonded together - ✔️✔️Molecule=
False, because elements can be divided into subatomic particles - ✔️✔️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 - ✔️✔️All atoms of an element are
identical and have the same mass and properties.(Dalton's Atomic Theory) (True/False)
True - ✔️✔️Atoms of a given element are different from atoms of other elements.(Dalton's Atomic
Theory) (True/False)
True - ✔️✔️Compounds are formed by combinations of atoms of two or more elements.(Dalton's
Atomic Theory) (True/False)
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