Oxygen is a liquid under one atmosphere. the boiling point of a substance is the temperature at which vapor pressure of a liquid is equal to the pressure of the surrounding liquid. the boiling point of oxygen at this case is 90.0k. Therefore the temperature of oxygen is 90-273= -183 celsius scale
When building a bridge, engineers want the bridge cables to have great:
- Tensile strength has to do with the amount of stress that a thing is able to resist without breaking under legthwise stress.
- This is measured by the largest load (kg) per unit area as it refers to the amount of stress an object or material is <u>able to endure</u> without tearing apart or breaking off.
- As a result of this, when building a bridge, engineers want the bridge cables to have great tensile strength so that they do not collapse <em>under the weight</em> placed on them.
- A bridge is a passage or structure that <em>connects between two obstacles.</em> A lot of cars, heavy lorries and trucks pass through a bridge, so iit is important that the bridge cables are able to resist this stress effectively.
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- Therefore, the correct answer is tensile strength
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It's a chemical change because bonds are being broken and formed.
Los cambios de estado físico son transformaciones que ocurren de un estado de la materia a otro, sin cambiar la estructura molecular de la materia, es decir, sin transformarse en otras sustancias.
Los tres estados físicos básicos de la materia son:
- sólido,
- líquido y
- gaseoso.
Se puede decir que son diferentes solo por la organización de sus partículas, lo que determina su cambio de estado pero sin cambiar la estructura molecular.
Cualquier sustancia se puede encontrar en estos tres estados físicos, dependiendo de su temperatura y presión.
El aumento de temperatura hace que las moléculas se separen y el aumento de presión hace que se acerquen.
En estado sólido las partículas están más juntas, en el líquido se mueven más y en el gas están bien separadas.
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I think the answer is systems tend to undergo changes towards lower energy and higher entropy.
Usually the point of chemical reactions is to go from a state of higher energy to lower energy (it is possible for reactions to go from lower to higher energy though as in the case of endothermic reactions).
As for entropy, usually it requires energy to lower the entropy of a system since entropy can be thought of as the relative disorder of the system. If you go from a state of higher disorder to lower disorder work usually needs to be done.
This trend can be shown in the equation ΔG=ΔH-TΔs:
ΔG stands for Gibbs free energy
ΔH stands for change in enthalpy
ΔS stands for change in entropy
T stands for temperature
when ever ΔG is negative the reaction is spontaneous which means that it is favored. As you can see ΔG is negative at any temperature when ΔH is negative and ΔS is positive showing that going to a lower energy state and raising the entropy is usually favored in nature.
I hope this helps. Let me know if anything is unclear or if you need further explanation.