| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.14 |
| Score | 0% | 63% |
Atoms of an element whose atoms can vary in the number of neutrons in their nucleus are called which of the following?
products |
|
ions |
|
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.
In the food chain, omnivores may be which of the following?
primary or tertiary consumers |
|
secondary or tertiary consumers |
|
secondary consumers or scavengers |
|
primary or secondary consumers |
Secondary or tertiary consumers may be omnivores.
Blood is created in:
the heart |
|
the liver |
|
red blood cells |
|
bone marrow |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.
Arteries carry __________ blood at __________ pressure.
deoxygenated, low |
|
oxygenated, high |
|
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.
Convert 0C° to F°.
32 |
|
-32 |
|
0 |
|
16 |
To convert from C° to F° use:
\(F° = {9 \over 5}C° + 32\)
\(F° = {9 \over 5}(0) + 32\)
\(F° = 0 + 32 = 32\)