Exploring Chemistry Chapters 9-12 Flashcards
Timbuktu is located at the edge of the _______________ Desert.
Sahara
Has anyone ever succeeded in making organic material in a laboratory?
yes
A diagram of a water molecule shows it as
an oxygen atom face with hydrogen atom ears
In cool water, molecules move more ___ than in warm water.
slowly
Sodium and chlorine families form compounds by
electrical attraction
Sugar is an example of a compound that is ___.
formed by living organisms
Snow conducts heat ___.
poorly
Paraffin is an example of a ___ hydrocarbon chain.
long
Water boils at
100oC [212oF]
The charged sodium atom, Na+, and the charged chlorine atom, Cl-, will
attract one another
Ice ___ in water
floats
The Nile River continues to flow through deserts because
it is fed by melting snow in the mountains
A hydrocarbon is a compound that contains only carbon and
hydrogen
___ is used for refrigeration.
Freon
When Leo Baekeland mixed carbolic acid and formaldehyde, the result was
a substance that clogged test tubes
Ethyl alcohol and dimethyl ether are examples of
isomers
___ is the most common liquid on earth.
Water
Does an evaporated liquid warm its surroundings?
no
Does salt have any purpose other than flavoring food?
yes
The purple dye containing bromine was prepared by Phoenicians who lived in the city of _______________.
Tyre
Methane is also known as what kind of gas?
marsh
Carbon needs _______________ more electrons to have its electrons in the stable arrangement like the electrons of neon.
four
The _____ reduces the effect of harmful ultraviolet rays from the sun.
ozone layer
Another name for the chlorine family is
salt makers
The number of chlorine atoms in carbon tetrachloride is ___.
four
When burned with oxygen, natural gas releases carbon dioxide and
water.
Leo Baekeland discovered the substance he called Bakelite while trying to make a substitute for
shellac
Does methane or water boil at a higher temperature?
water
William Bently made __ money from his hobby of photographing snowflakes.
no
Bakelite was the first plastic and was immediately replaced by better ones. Did that prove to be a disappointing failure to Leo Baekeland.
no
Teflon is ___.
slick
Salt is an example of a compound that is ____.
found in the non-living environment
Did William Henry Perkin retire after success in his research?
no
Chlorinating drinking water was first tried in London in 1897 to
top an outbreak of typhoid fever
Oxygen and hydrogen form the water molecule by ___ electrons.
sharing
Do chemical reactions follow a different set of rules in living things than they do in the laboratory?
no
The plus sign, +, for the charged sodium atom, Na+, shows that it
has more protons than electrons
The elements found in organic compounds include hydrogen, oxygen, nitrogen, and ___.
carbon
___ is burned as a fuel in racing engines.
Methanol
Liquid water ___ when it changes into ice.
contracts
