| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.04 |
| Score | 0% | 61% |
Which of the following states of matter exists at the lowest temperature?
liquid |
|
gas |
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solid |
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none of these |
Solids exist at a lower temperature than liquids which exist at a lower temperature than gases.
Molecules and atoms that are outputs from a chemical reaction are known as which of the following?
side effects |
|
results |
|
products |
|
reactants |
During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).
Which of these is not a component of blood?
red blood cells |
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marrow |
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white blood cells |
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plasma |
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.
In the water cycle, infiltration is most closely related to:
runoff |
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water table |
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oceans |
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rivers |
The water then accumulates as runoff and eventually returns to bodies of water or is absorbed into the Earth (infiltration) and becomes part of the water table, an underground resevoir of fresh water.
Which of the following substances gives up positively charged hydrogen ions (H+) when dissolved in water?
solution |
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acid |
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base |
|
alkaline |
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.