An ion is an element that bears only one electric charge, either positive or negative. An isotope is an element with the same number of protons but a different number of neutrons. An electron is a negatively charged subatomic particle. A dipole fits the characteristics. Hence, the answer is B.
The molecular formula should have been give to you from ur teacher
A physical change occurs when a substance changes phase.
For example, boiling pure water (H₂O) is physical change of substance (from liquid to gaseous state). In physical change, the bonds between oxygen and hydrogen can not be separated.
Sublimation of iodine (from solid to gas state) is also physical change.
Physical property can be observed and measured without any changes in molecular composition. The same substance is present before and after the change.
Answer:
0.15 L= 150 ml
Explanation:
barium choride = BaCl₂
0.51 M = 0.51 mol BaCl₂/ 1 L solution
1 mol is equal to 1000 times a mmol:
0.51 mol = 0.51 x 10³ mmol= 510 mmol
As you know that the solution has 510 mmol BaCl₂ per liter, you can use the following simple calculation to obtain the volume in which there are 75 mmol BaCl₂:
510 mmol BaCl₂ ------ 1 L
75 mmol BaCl₂--------- X
X= 
= 0.147 L ≈ 0.15 L
I d(ont) know what that is, but Ig yes
