| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.08 |
| Score | 0% | 62% |
Which of these does not contain oxygenated blood?
aorta |
|
left ventricle |
|
pulmonary vein |
|
right atrium |
To provide oxygen to the body, blood flows through the heart in a path formed by the right atrium → right ventricle → lungs → left atrium → left ventricle → body. When blood enters the right side of the heart it is deoxygenated. It enters the left side of the heart oxygenated after traveling to the lungs.
When two air masses meet and neither is displaced, what kind of front is present?
stationary |
|
cold |
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occluded |
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warm |
When two air masses meet and neither is displaced, a stationary front is created. Stationary fronts often cause persistent cloudy wet weather.
A transition zone between two air masses is called:
boundary |
|
thunderstorm |
|
fog |
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front |
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.
pH is a scale that measures of how basic or acidic a solution is. A solution with a pH of 9 is:
neutral |
|
alkaline |
|
water |
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acidic |
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.
Which of these is matter than cannot be separated into different types of matter by ordinary chemical methods?
compound |
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atom |
|
molecule |
|
element |
An element is matter than cannot be separated into different types of matter by ordinary chemical methods.