The correct answer is A. A <span> sample of sodium hydroxide (NaOH) has a mass of 160.0 g which is equal to 4 moles of NaOH. TO calculate this, we use the relation of the molar mass given.
160.0 g NaOh ( 1 mol NaOH / 40.0 g NaOH ) = 4.000 mol NaOH</span>
A chemical change creates a new substance
Explanation: Electron shielding could be defined as the reduction or mitigation in the effective cloud due to the differences in the attractive force of the nucleus on the electrons of an atom. Electron shielding explains the protection from attractive forces afforded to the outer electrons by their inner compatriot.
In Nitrogen, there are 3 2p electrons in the 2p sub-level which are shielded by 4 inner electrons; 2 in the 1s level and 2 in the 2s level. Therefore, the electrons in the 2p sub-level enjoy the greatest shielding from the attractive force of the nucleus due to the shield afforded to the valence electrons by the 4 inner electrons .
Answer:
The answer is:
Explanation:
1. The pressure of the gas increases. I think is incorrect because there is a direct proportion between number of particles and pressure, if the number of particles diminishes, then, the pressure diminishes.
2. The pressure of the gas remains the same. It's incorrect if one diminishes also the other will diminish
3. The number of collisions of gas particles decreases.
I think this is the correct one, if there are less particles, then they will interact less and the collisions will decrease.
4. The number of collisions of gas particles remains the same. It's incorrect the number of collisions could not stay the same due to the number of particles is lower.
they move around and eventually come and join to make a solid