Chemistry, 07.12.2021 02:00 liptontea4
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: 3
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How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)
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Chemistry, 22.06.2019 17:40
Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.
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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