| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.01 |
| Score | 0% | 60% |
In the food chain, omnivores may be which of the following?
primary or secondary consumers |
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secondary or tertiary consumers |
|
primary or tertiary consumers |
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secondary consumers or scavengers |
Secondary or tertiary consumers may be omnivores.
Which of the following substances gives up negatively charged hydroxide ions (OH-) when dissolved in water?
hydrogen |
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base |
|
ion |
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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.
Water freezing or boiling is an example of which of the following?
heating |
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phase transition |
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cooling |
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sublimation |
A substance undergoes a phase transition when it moves from one state of matter to another, for example, when water freezes or boils.
Work is measured in:
watts |
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horsepower |
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amps |
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joules or newton-meters |
Work is performed on an object when an applied force causes displacement along the same vector. Measured in joules (J) or newton-meters (Nm), work is calculated by multiplying force times displacement: \(W = \vec{F}\vec{d}\)
In the classification of life, which of the following is not a domain?
eukaryota |
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animalia |
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archaea |
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bacteria |
The broadest classification of life splits all organisms into three groups called domains. The three domains of life are bacteria, archaea and eukaryota.