| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.18 |
| Score | 0% | 64% |
Which of these is matter than cannot be separated into different types of matter by ordinary chemical methods?
element |
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compound |
|
molecule |
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atom |
An element is matter than cannot be separated into different types of matter by ordinary chemical methods.
Convert -20C° to F°.
36 |
|
78 |
|
-4 |
|
-36 |
To convert from C° to F° use:
\(F° = {9 \over 5}C° + 32\)
\(F° = {9 \over 5}(-20) + 32\)
\(F° = {-180 \over 5} + 32\)
\(F° = -36 + 32 = -4\)
An element in the physical state of __________ maintains a constant volume and shape.
gas |
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gel |
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solid |
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liquid |
An element in a solid state has atoms or molecules that are constricted and do not move freely. Solids maintain a constant volume and shape and exist at a lower temperature than liquids or gases.
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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ions |
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isotopes |
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reactants |
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.
Arteries carry __________ blood at __________ pressure.
oxygenated, high |
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deoxygenated, low |
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deoxygenated, high |
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oxygenated, low |
Veins carry blood back to the heart from the body. While arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood. Like the heart, veins contain valves to prevent blood backflow.