Chemistry, 03.12.2021 19:50 cia196785920
How does a phase change from solid to liquid occur in a substance? (1 point)
Heat energy is added to the substance, weakening the electrical attraction between molecules.
Heat energy is released from the substance, strengthening the electrical attraction between molecules.
Heat energy is added to the substance, strengthening the electrical attraction between molecules.
Heat energy is released from the substance, weakening the electrical attraction between molecules.
How do weak intermolecular bond strengths affect the melting and boiling point of a substance? (1 point)
The melting point is higher, but the boiling point is lower.
Both the melting point and boiling point are higher.
The melting point is lower, but the boiling point is higher.
Both the melting point and boiling point are lower
Which statement describes the hydrogen and oxygen atoms in water? (1 point)
The lone pair of electrons in each hydrogen atom causes the molecule to be bent; the oxygen atom has a partial positive charge, while the hydrogen atoms have partial negative charges.
The lone pair of electrons in each hydrogen atom causes the molecule to be bent; the oxygen atom has a partial negative charge, while the hydrogen atoms have partial positive charges.
The lone pairs of electrons in the oxygen atom causes the molecule to be bent; the oxygen atom has a partial negative charge, while the hydrogen atoms have partial positive charges.
The lone pairs of electrons in the oxygen atom causes the molecule to be bent; the oxygen atom has a partial positive charge, while the hydrogen atoms have partial negative charges
On a heating curve, what do the plateaus represent? (1 point)
energy remaining constant.
increasing temperature
phase change
increasing kinetic energy
At what point on a heating curve graph does a phase change occur? (1 point)
at each plateau
at each slope
at the first plateau
at the last slope
Answers: 1
Chemistry, 22.06.2019 13:30, yasiroarafat12
How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.
Answers: 1
Chemistry, 22.06.2019 14:10, cameronbeaugh
13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.
Answers: 1
Chemistry, 22.06.2019 17:40, aguilarjose
If 3 moles of a compound use 24 j of energy in a reaction, what is the a hreaction in j/mol?
Answers: 1
How does a phase change from solid to liquid occur in a substance? (1 point)
Heat energy is added...
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