| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.34 |
| Score | 0% | 47% |
-40°F is how many °C?
-40 |
|
-8 |
|
\({40 \over 9}\) |
|
\(-{40 \over 9}\) |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (-40 - 32)\)
\(C° = {5 \over 9} (-72) = {{-72 \times 5} \over 9}\)
\(C° = {-360 \over 9}\)
\(C° = -40\)
Elements that belong to the same period in the Periodic Table of the Elements have the same number of:
atomic mass units |
|
electrons |
|
electron shells |
|
protons |
The rows of the Periodic Table are called periods and contain elements that have the same number of electron shells ordered from lower to higher atomic number.
Veins __________ blood at __________ pressure.
deoxygenated, high |
|
deoxygenated, low |
|
oxygenated, low |
|
oxygenated, high |
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.
Generally, an atom has __________ negative electrons orbiting the nucleus as it does positive protons inside.
more |
|
double the number of |
|
equal numbers of |
|
fewer |
An electron is a subatomic particle that orbits the nucleus of an atom. It carries a negative electric charge. Generally, an atom has the same number of negative electrons orbiting the nucleus as it does positive protons inside.
When the clouds become too saturated with water, the water is released as precipitation in the form of:
ice |
|
rain |
|
snow |
|
snow or ice |
Rising into the atmosphere, the water condenses into clouds. When the clouds become too saturated with water, the water is released as snow or ice precipitation which may warm as it falls to reach Earth as rain.