| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.63 |
| Score | 0% | 73% |
Water freezing or boiling is an example of which of the following?
sublimation |
|
cooling |
|
phase transition |
|
heating |
A substance undergoes a phase transition when it moves from one state of matter to another, for example, when water freezes or boils.
Which of the following states of matter exists at the lowest temperature?
gas |
|
liquid |
|
solid |
|
none of these |
Solids exist at a lower temperature than liquids which exist at a lower temperature than gases.
What part of the nervous system is responsible for controlling involuntary actions like breathing, swallowing, and heartbeat?
cerebrum |
|
medulla |
|
spinal cord |
|
cerebellum |
Part of the brainstem, the medulla is the connection between the brain and the spinal cord. It controls involuntary actions like breathing, swallowing, and heartbeat.
212°F is how many °C?
0 |
|
100 |
|
\(135 {5 \over 9}\) |
|
-100 |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (212 - 32)\)
\(C° = {5 \over 9} (180) = {{180 \times 5} \over 9}\)
\(C° = {900 \over 9}\)
\(C° = 100\)
Plant cells may generate energy through which of the following?
aerobic respiration |
|
anaerobic respiration |
|
photosynthesis |
|
all of these |
Some plant cells produce their own energy through photosynthesis which is the process by which sunlight, carbon dioxide, and water react to make sugar and oxygen. Animal cells cannot produce their own energy and, instead, generate energy when mitochondria consume outside sugar and oxygen through aerobic respiration.