CHEM1301 questions 1 and answers (100% solved)
119 - ✔✔✔-How many elements are there?
29 - ✔✔✔-how many elements have been created by scientists
90 - ✔✔✔-how many elements occur naturally on earth
A change in a substance that does not involve a change in the identity of the substance - ✔✔✔-
physical change
a change that produces matter with a different composition than the original matter - ✔✔✔-
chemical change
A measure of how much matter is in an object - ✔✔✔-mass
allotrope - ✔✔✔-Two or more forms of the same element that differ in their properties but
exist in the same physical state are called what?
Anything that has mass and takes up space - ✔✔✔-matter
atom - ✔✔✔-smallest identifiable unit of an element
atomic number - Z - ✔✔✔-number of protons in the nucleus
by physical means - ✔✔✔-how can a mixture be separated
chemical - ✔✔✔-compounds can only be separated into their pure components by what means
, CHEM1301 questions 1 and answers (100% solved)
compound
elements cannot - ✔✔✔-pure substances that can be broken down into simpler ones by
chemical means
compound - ✔✔✔-carbon dioxide is what
compound - ✔✔✔-table salt (NaCl)
compound - ✔✔✔-Water is a
compressible - ✔✔✔-gases are always ___-
electron - ✔✔✔-A proton is nearly 2,000 times more massive than an
element - ✔✔✔-nickel is a
fixed volume and rigid shape - ✔✔✔-A solid has a ______________ shape and a __________
volume.
fixed, but not a fixed shape - ✔✔✔-liquid state of matter have ___ volume but ____ a fixed
shape
heat and electricity - ✔✔✔-Metals are good conductors of _________ and _________.
homogeneous - ✔✔✔-A mixture that looks the same throughout
homogeneous mixture - ✔✔✔-Air is a
119 - ✔✔✔-How many elements are there?
29 - ✔✔✔-how many elements have been created by scientists
90 - ✔✔✔-how many elements occur naturally on earth
A change in a substance that does not involve a change in the identity of the substance - ✔✔✔-
physical change
a change that produces matter with a different composition than the original matter - ✔✔✔-
chemical change
A measure of how much matter is in an object - ✔✔✔-mass
allotrope - ✔✔✔-Two or more forms of the same element that differ in their properties but
exist in the same physical state are called what?
Anything that has mass and takes up space - ✔✔✔-matter
atom - ✔✔✔-smallest identifiable unit of an element
atomic number - Z - ✔✔✔-number of protons in the nucleus
by physical means - ✔✔✔-how can a mixture be separated
chemical - ✔✔✔-compounds can only be separated into their pure components by what means
, CHEM1301 questions 1 and answers (100% solved)
compound
elements cannot - ✔✔✔-pure substances that can be broken down into simpler ones by
chemical means
compound - ✔✔✔-carbon dioxide is what
compound - ✔✔✔-table salt (NaCl)
compound - ✔✔✔-Water is a
compressible - ✔✔✔-gases are always ___-
electron - ✔✔✔-A proton is nearly 2,000 times more massive than an
element - ✔✔✔-nickel is a
fixed volume and rigid shape - ✔✔✔-A solid has a ______________ shape and a __________
volume.
fixed, but not a fixed shape - ✔✔✔-liquid state of matter have ___ volume but ____ a fixed
shape
heat and electricity - ✔✔✔-Metals are good conductors of _________ and _________.
homogeneous - ✔✔✔-A mixture that looks the same throughout
homogeneous mixture - ✔✔✔-Air is a
