| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.72 |
| Score | 0% | 74% |
Water freezing or boiling is an example of which of the following?
heating |
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cooling |
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phase transition |
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sublimation |
A substance undergoes a phase transition when it moves from one state of matter to another, for example, when water freezes or boils.
A subatomic particle found in the nucleus of an atom. It carries a positive electric charge. This desribes which of the following?
electron |
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proton |
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neutron |
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atom |
A proton is a subatomic particle found in the nucleus of an atom. It carries a positive electric charge.
Vector quantities are fully described by which of the following?
a magnitude and a direction |
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a direction and a polarity |
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a magnitude only |
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a direction only |
Velocity and displacement are vector quantities which means each is fully described by both a magnitude and a direction. In contrast, scalar quantities are quantities that are fully described by a magnitude only. A variable indicating a vector quantity will often be shown with an arrow symbol: \(\vec{v}\)
When light travels between two substances it bends. This is called:
reflection |
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conduction |
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refraction |
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convection |
Because different materials have different refractive indices, light changes speed when passing from one material to another. This causes the light to bend (refraction) at an angle that depends on the change in refractive index between the materials. The greater the difference, the higher the angle of refraction.
Atoms of an element whose atoms can vary in the number of neutrons in their nucleus are called which of the following?
products |
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isotopes |
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reactants |
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ions |
The atomic mass of an element listed in the Periodic Table represents the average mass of a single atom of that element and is measured in atomic mass units (amu). This number is an average as some elements have isotopes with atoms that vary in their number of neturons and, therefore, differ in weight.