| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.81 |
| Score | 0% | 56% |
Which of the following is the formula for power?
\(P = w t\) |
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\(P = {\vec{w} \over t}\) |
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\(P = \vec{w}t\) |
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\(P = {w \over t}\) |
Power is the rate at which work is performed or work per unit time: \(P = {w \over t}\) and is measured in watts (W).
Molecules and atoms that are inputs to a chemical reaction are known as which of the following?
reactants |
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components |
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fuel |
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products |
During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).
Respiration is the process by which __________ absorb oxygen and eliminate carbon dioxide.
capillaries |
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diaphragms |
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bronchioles |
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blood cells |
The respiratory system manages respiration which is the process by which blood cells absorb oxygen and eliminate carbon dioxide.
Which of these is matter than cannot be separated into different types of matter by ordinary chemical methods?
compound |
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element |
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atom |
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molecule |
An element is matter than cannot be separated into different types of matter by ordinary chemical methods.
A compound is a substance containing two or more different chemical elements bound together by what kind of bond?
molecular |
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ionic |
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chemical |
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covalent |
A compound is a substance containing two or more different chemical elements bound together by a chemical bond. In covalent compounds, electrons are shared between atoms. In ionic compounds, one atom borrows an electron from another atom resulting in two ions (electrically charged atoms) of opposite polarities that then become bonded electrostatically.