Answer:
By adding heat energy
It changed to gas
Explanation:
A substance whose molecules are moving around each other is a liquid. They are held in shape by very weak intermolecular forces.
For solids, there is no movement because the molecules are held up in a fixed lattice.
Gases molecules moves randomly and independently of one another.
- When a liquid is heated and it gains heat energy, it changes phase.
- A phase change to gas can be predicted.
- This is because there is an increase in the speed of the substances.
Answer:
Elements on the left of the period 3 have higher melting and boiling points than those on the right. These low melting and boiling points are typical of non-metals. Argon, chlorine, sulfur and phosphorus are non-metals. On the left hand side of period 3 we find the elements sodium, magnesium and aluminium.
Explanation:
In the whole of period 3, the outer electrons are in 3-level orbitals. These are all the same sort of distances from the nucleus, and are screened by the same electrons in the first and second levels. The major difference is the increasing number of protons in the nucleus as you go from sodium across to argon.
have a good day T_T
Answer:
Chlorine
Explanation:
Each arrow represents one electron. Most of the boxes are filled, meaning they have two electrons. The last box only has one arrow, so it only has one electron. If you add it up, you get 17, which is Chlorine.
The question is incomplete, here is the complete question:
A chemist measures the amount of nitrogen gas produced during an experiment. She finds that of 282. g of nitrogen gas is produced. Calculate the number of moles of nitrogen gas produced. Be sure your answer has the correct number of significant digits.
<u>Answer:</u> The number of moles of nitrogen gas produced are 10.07 moles
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
![\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}](https://tex.z-dn.net/?f=%5Ctext%7BNumber%20of%20moles%7D%3D%5Cfrac%7B%5Ctext%7BGiven%20mass%7D%7D%7B%5Ctext%7BMolar%20mass%7D%7D)
We are given:
Given mass of nitrogen gas = 282 g
Molar mass of nitrogen gas = 28 g/mol
Putting values in above equation, we get:
![\text{Moles of nitrogen gas}=\frac{282g}{28g/mol}=10.07mol](https://tex.z-dn.net/?f=%5Ctext%7BMoles%20of%20nitrogen%20gas%7D%3D%5Cfrac%7B282g%7D%7B28g%2Fmol%7D%3D10.07mol)
Hence, the number of moles of nitrogen gas produced are 10.07 moles