Covalent bonds form when electrons are shared between two nonmetals.
The gases like nitrogen and oxygen are not greenhouse gases because they do not absorb infrared radiation.
<h3>What are Greenhouse gases?</h3>
Greenhouse gas is a gas that has the property of absorb infrared radiation from the Earth’s surface and reradiate back to the Earth’s surface, thus contributing to the greenhouse effect.
<h3>What is infrared radiation?</h3>
Infrared radiation is an electromagnetic radiation with wavelengths longer than those of visible light.
Carbon dioxide, nitrous oxide, methane, and water vapour are the most important greenhouse gases.
Hence, nitrogen and oxygen are not greenhouse gases despite being in the atmosphere.
To learn more about greenhouse gas here
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Answer:
Semiconductors are poor conductors at low temperatures, but their resistance decreases with increasing temperature.
Explanation:
A semiconductor can be defined as a crystalline solid substance that has its conductivity lying between that of a metal and an insulator, due to the effects of temperature or an addition of an impurity. Semiconductors are classified into two main categories;
1. Extrinsic semiconductor.
2. Intrinsic semiconductor.
The statement which best describes the electrical conductivity of metals and semiconductors is that semiconductors are poor conductors at low temperatures, but their resistance decreases with increasing temperature.
This ultimately implies that, semiconductors are typically an insulator (poor conductor) at low temperatures and a good conductor at high temperatures.
Additionally, conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction while when it relates to thermal energy, it is known as heat conduction.
Notice that the metals trade places. That means it is a double replacement RXN or C
Watershed
A watershed is an entire river system of an area drained by a river and its tributaries
