| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.18 |
| Score | 0% | 64% |
Convert -20C° to F°.
-36 |
|
-4 |
|
78 |
|
36 |
To convert from C° to F° use:
\(F° = {9 \over 5}C° + 32\)
\(F° = {9 \over 5}(-20) + 32\)
\(F° = {-180 \over 5} + 32\)
\(F° = -36 + 32 = -4\)
Respiration is the process by which __________ absorb oxygen and eliminate carbon dioxide.
blood cells |
|
capillaries |
|
diaphragms |
|
bronchioles |
The respiratory system manages respiration which is the process by which blood cells absorb oxygen and eliminate carbon dioxide.
An air mass is a large body of air that has which of the following characteristics?
all of these |
|
similar moisture |
|
similar density |
|
similar temperature |
An air mass is a large body of air that has similar moisture (density) and temperature characteristics. A front is a transition zone between two air masses.
Which of the following is the smallest component of an element that still retains the properties of the element?
molecule |
|
atom |
|
element |
|
neutron |
An atom is the smallest component of an element that still retains the properties of the element.
Which of the following substances gives up negatively charged hydroxide ions (OH-) when dissolved in water?
base |
|
hydrogen |
|
ion |
|
acid |
An acid is a substance that gives up positively charged hydrogen ions (H+) when dissolved in water. A base (alkaline) gives up negatively charged hydroxide ions (OH-) when dissolved in water. pH is a scale that measures of how basic or acidic a solution is. Numbered from 0 to 14, solutions with a pH of 7 are neutral, less than 7 are acidic, more than 7 are alkaline.