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A Beka Chemistry Test 1 Grade 11
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Gravity
Terms in this set (51)
isotopes
what are atoms that have the same number of protons but different numbers of neutrons?
proton
The number of which type of atom identifies an atom as a given element?
electron
Which of the following subatomic particles is NOT found in the nucleus of an atom?
proton
neutron
electron
quark
organic chemist
What type of chemist would most likely study alcohols, which consist of carbon, hydrogen, and oxygen?
freezing of a liquid
Which of the following is NOT an evidence that a chemical change has occurred?
distinct change in color
formation of a gas
freezing of a liquid
formation of a precipitate
mixture
What is a group of two or more atoms linked together by chemical bonds?
-1
What is the relative charge of an electron?
John Dalton
Who developed the atomic theory of matter?
phase
What is a homogenous part of a system that is in contact with but physically distinct from other parts of the system?
Ag
silver (atomic symbol)
Na
sodium (atomic symbol)
Mg
magnesium (atomic symbol)
K
potassium (atomic symbol)
S
sulfur (atomic symbol)
C
carbon (atomic symbol)
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Verified questions
PHYSICAL SCIENCE
What is the acceleration experienced by a car that takes 10 s to reach 27 m/s from rest?
PHYSICAL SCIENCE
Describe how quasars got their name.
PHYSICAL SCIENCE
The objective lens in a microscope has a magnification of 30. What is the magnification of the microscope if the eyepiece lens has a magnification of 20?
PHYSICAL SCIENCE
The pH of human blood is about pH 7.4 and must be kept within a few tenths of a pH unit of the normal pH. Reactions within the human body ensure that a proper pH is maintained. The equilibrium shown below between carbonic acid, $\mathrm{H}_{2} \mathrm{CO}_{3}$, and the hydrogen carbonate ion, $\mathrm{HCO}_{3}^{-}$, is important to maintain the blood's pH. $$ \mathrm{H}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O} \rightleftarrows \mathrm{HCO}_{3}^{-}+\mathrm{H}_{3} \mathrm{O}^{+} $$ Find out what happens to keep the pH from decreasing as extra hydronium ions enter the blood. Also find out how the pH is kept from increasing as extra $\mathrm{OH}^{-}$ ions enter the blood.
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