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A pure substance A is found to change upon heating into two new pure substances B and C. Substance B, but not substance C, undergoes reaction with oxygen. Based on this information we definitely know that ____.
A. substance A is a compound and C is an element.
B. Both A and B are compounds.
C. is a compound and C is an element.
D. A is a compound.
Vanillin contains 63.15% C, 5.30% H, and 31.55% O whether it is extracted from vanilla beans, synthesized chemically from clove oils, or extracted from wood pulp wastes. Vanillin is most likely to be:
A. homogenous mixture of elements
B. heterogeneous mixture of elements
C. compound of C, H, and O
D solution of C in H and O
A solid melts gradually between 85°C and 95°C to give a milky, oily liquid. When a laser beam shines through the liquid, the path of the beam is clearly visible. The milky liquid is likely to be:
A.heterogeneous mixture c. gaseous solution
B.homogeneous mixture d. compound
If you were asked to separate the components of a mixture of sand and water, and further separate the components of water. What processes would you perform?
A.decantation and filtration
c. filtration and distillation
B. decantation and
d. filtration and evaporation
The element X in a compound was involved in a
A.It will increase c. It will be doubled
B.It will disappear d. It will remain the same
Which best describes isotopes?
A.Same number of neutrons, different number of electrons
B. Same number of protons, different number of neutrons
C.Same number of protons, different number of electrons
D.Same number of neutrons, different number of protons
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