Chemistry, 17.11.2019 00:31 makalanharrison
1)the chemical properties of a compound are different from the chemical properties of a mixture because:
a)the substances in a compound are chemically joined in a fixed proportion
b) the substances in a compound are always composed of at least three different types of atoms
c)mixtures are always homogeneous
d)the properties of a mixture are different from those of the substances from which it is made
2)when kool-aid is added to water and stirred, the water becomes uniformly colored. this is proof that a chemical change has occurred. t/f
3)under the same conditions of temperature and pressure, a liquid differs from a gas because the particles of the liquid:
a)are in constant straight-line motion
b)take the shape of the container they occupy
c)have no regular arrangement
d)have stronger forces of attraction between them
Answers: 1
Chemistry, 22.06.2019 16:50
Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.
Answers: 1
Chemistry, 23.06.2019 07:00
What is the difference between covalent bonds and ionic bonds? covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between charged atoms. covalent bonds involve the transfer of electrons between charged atoms; ionic bonds involve the sharing of electrons between atoms. covalent bonds involve the sharing of pairs of electrons between atoms; ionic bonds involve the sharing of single electrons between atoms. covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the sharing of protons between charged atoms.
Answers: 1
Chemistry, 23.06.2019 07:30
Assume that 13.5 g solid aluminum (al) react with hcl to produce solid aluminum chloride (alcl3) salt and gaseous hydrogen (h2) at standard temperature and pressure.
Answers: 1
1)the chemical properties of a compound are different from the chemical properties of a mixture beca...
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