They discovered that *elements* show increase in atomic numbers across the period.
Answer:
secound one is the answer: Distillation
this may help you
thermal contact
When heat flows from one object or substance to another it is in contact with, the objects or substances are said to be in thermal contact. The state where objects in thermal contact with each other reach the same temperature, no heat flows between them.
Answer:
0.9307 moles have been introduced into the bag.
Explanation:
Pressure of the gas within the bag,P = 1.00 atm
Temperature of the gas remains at room temperature,T=20.0 °C = 293.15 K
Volume of the gas in the bag = V = 22.4 L
Number of moles of gas = n
Using an ideal gas equation:


n = 0.9307 moles
0.9307 moles have been introduced into the bag.
Answer:
C
The answer is C pleaaaaaaase