Why is a homogeneous mixture not considered a pure substance?
a pure substance can be separated by chemical means, while a mixture can be separated by physical means.
b mixture contains one substance, while a pure substance contains more than one.
c only heterogeneous mixtures are pure substances.
d pure substance can be separated by physical means, while a mixture can be separated by chemical means.
how can a mixture of pigments be separated?
a magnetic attraction
b chromatography
c crystallization
d filtration
which of these is a unique property of acids?
a conducts electricity in solution
b tastes sour
c feels slippery
d contains a carbon
if a solution feels slippery and has a ph of 12, what is the solution?
a acidic
b neutral
c saturated
d basic
which of these is an acid?
a water
b lye
c naoh
d vinegar
what does ph measure?
a concentration of hydroxide ions in solution
b number of hydrogen atoms in an acid
c number of hydroxide atoms in a base
d concentration of hydrogen ions in solution
solutions with high ph values have which of these properties?
a tastes sour
b urns litmus paper red
c feels slippery
d gives off hydrogen gas when reacted with metal
acids turn litmus paper what color?
a blue
b red
c yellow
d pink
Answers: 1
Chemistry, 22.06.2019 01:30
Aroller coaster car is traveling down a track at 22 m/s. the car has a mass of 2000 kg. what is the kinetic energy of the car? a) 22,000 j b) 968,000 j c) 484,000 j d) 44,000 j
Answers: 2
Chemistry, 22.06.2019 03:00
Schrodinger and heisenberg developed an alternate theory about atomic nature that contradicted some of bohr's model of the atom. how do changes resulting from new technology and evidence affect the reputation of the atomic theory?
Answers: 1
Chemistry, 22.06.2019 20:30
What is a difference between a mixture of elements and a mixture of compounds
Answers: 1
Chemistry, 22.06.2019 21:20
One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .
Answers: 2
Why is a homogeneous mixture not considered a pure substance?
a pure substance can be s...
a pure substance can be s...
Mathematics, 23.02.2021 01:50
History, 23.02.2021 01:50
Mathematics, 23.02.2021 01:50
Mathematics, 23.02.2021 01:50
Mathematics, 23.02.2021 01:50
Geography, 23.02.2021 01:50
Health, 23.02.2021 01:50
Social Studies, 23.02.2021 01:50