Answer:
From top to bottom down a group, electronegativity decreases. This is because atomic number increases down a group.
Answer:
The correct option is Ability to store water in leafy structures to prevent excess evaporation.
Explanation:
Desert plants need to have adaptations so that they can withstand the harsh conditions of the environment. In order to withstand the harsh temperatures of the desert, a quiver tree has leafy structures which help it to store water for long time. In this way, water is prevented to be lost from the tree due to evaporation. Hence, it is an effective adaptation to live in desert conditions.
The Quiver tree also has white powder on is branches to hide from the Sun's rays.
The ionic formula of sodium oxide would be Na20
Answer:
A
Explanation:
The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have fewer than eight electrons, they tend to react and form more stable compounds. When discussing the octet rule, we do not consider d or f electrons. Only the s and p electrons are involved in the octet rule, making it useful for the main group elements (elements not in the transition metal or inner-transition metal blocks); an octet in these atoms corresponds to an electron configurations ending with s2p6 .
<span>Answer:
CO2→CO + 12O2 is not a balanced reaction, I think you meant to post " CO2→CO + 1/2O2"
The simple answer is that the enthalphy for reaction 1 reversed is the same enthalpy as for the reaction as written but with the opposite sign.
If A + B = AB with 30 kJ released then
AB = A + B with 30 kJ absorbed.
We would write it as
A + B = AB heat of reaction = -30 kJ
AB = A + B heat of reaction = +30 kJ</span>
