I think the correct answer from the choices listed above is option A. In the modern periodic table, elements are arranged according to increasing <span>atomic number. The atomic number represents the number of protons present for a specific atom.</span>
Answer: C) 1.6
Explanation: I got it right
Hey there!
The answer/answers: <span>The four main greenhouse gases that support the natural greenhouse effect are:
</span><span>H2O (water vapor)
CO2 (carbon dioxide)
CH4 (methane)
and
NO (nitrous oxide)
These</span><span> greenhouse gas traps heat from the sun
</span>
Hopes this Helps u :D
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</span>
Answer:
it's A but I don't know the other one
When changing states, only the intermolecular forces are considered, which, in water's case are hydrogen bonds. In order to go from solid to liquid to gas, the hydrogen bonds between the water molecules must be weakened to a certain degree that allows the molecules to spread further apart in liquids, and must be broken altogether to separate the molecules in order to turn it into gas.
Therefore, the answer is d.
The reason it is not the covalent bonds within molecules (despite the fact that it will turn water into a gas, it’s not water vapour, but hydrogen and oxygen gas) is that when bonds within a molecule are broken, this is called decomposition and it is a CHEMICAL change. Changing states is only a PHYSICAL change.
It is not ionic because water has covalent bonds.
Hydrogen bonds can only occur BETWEEN molecules (intermolecular forces).
Covalent bonds can only occur WITHIN molecules (intramolecular).