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1.
1 point
all atoms of the same elements have the same number of
2.
1 point
An ionic bond is a bond between
3.
1 point
in the bohr model of the atom an electron in an orbit has a fixed
4.
1 point
which of the following best describe an example of pure chemistry?
5.
1 point
which of the following indicates that a physical change has taken place
6.
1 point
which scientist developed the quatum mecanical model of the atom?
7.
1 point
what are quanta of light called
8.
1 point
in the bohr model of the atom, where was the elcetons and protons located?
9.
1 point
the closness of a mesurment to its true value is measure of its
10.
1 point
the light given off by an electric discharge through sodium vapor is
11.
1 point
WHAT IS THE RANG IN SIZE OF MOST ATOMIC RADII IS APPROXIMATLY .
12.
1 point
the mordern periodic table is arranged in order of incressing atomic
13.
1 point
which of the following invoves a chemical change
14.
1 point
alloys with a wide ranfe of use are referred to as
15.
1 point
the variable that is obseverd during an experment is called wjat type of vairble?
16.
1 point
when an iron nail is ground into power its mass
17.
1 point
what is another name for transition metals
18.
1 point
a theory is
19.
1 point
alloy are important because
20.
1 point
the letter "p" in the synbol 4p^3 indicates the
21.
1 point
which of the following is true for all chemical reactions?
22.
1 point
which of the following elements has the smallest atomic raius?
23.
1 point
how does oxgyen obey the octet rule when reacting to form compound
24.
1 point
compare with the electrongativties of the element on the left side of a peroid the electronegativeies of the elements on the right side of the same peroid tent to
25.
1 point
which of the following is an example of chemistry research in the main are of energy
26.
1 point
collaboration and comummunication are important in science because
27.
1 point
which of the following is false
28.
1 point
inoci compound are normally in which physical state at room temperature
29.
1 point
which discovery did J.J thomson make tha impoved upon daltos atomic theory?
30.
1 point
which of the following represents a compound?
31.
1 point
which of the following is a chemical property of water @ 4 c
32.
1 point
which of the following elements has the lowest electrongativily
33.
1 point
the sum of the protons and nuetons in an atoms equals to the
34.
1 point
what do chemical symbols and formulas represnt, respecitively?
35.
1 point
to what category of element does an elemnt belong if its a poor conductor of electricity?
36.
1 point
in chemistry reaction the type of products obtained is largely determined by which part of the reactinh chemcials
37.
1 point
what information does a molecular formula provide
38.
1 point
which of the following was one of daltons improvemts over democritus ideas
39.
1 point
what is another name for rpresentative elements
40.
1 point
the wave like properties of electons are useful in
41.
1 point
there are many resons to study chemistry. In general, most people study chemistry for all of the following resons EXCEPT
42.
1 point
most ionic compounds
43.
1 point
when an electron moves from a lower to a higher energy level , the electron
44.
1 point
whoch field of science studies the compostion and sturcture of matter?
45.
1 point
which of the following involves a chemical change?
46.
1 point
Each peroid in the periodic table correpomfs to a(n)
47.
1 point
a chemical change occures when a piece od wood
48.
1 point
the shape(not the size) of an electron cloud is determined by the electron
49.
1 point
the study of chemistry that in general do not contain carbon is traditionally called what type of chemistry?
50.
1 point
A compound cp,[psed of catioms amd amioms is called
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