Answer:
isotopes
Explanation:
The atoms of a chemical element can exist in different types. These are called isotopes. They have the same number of protons (and electrons), but different numbers of neutrons. Different isotopes of the same element have different masses.
Answer:
Option 1 and 3 are correct.
Explanation:
Buffer solution is the solution which resists the change in the magnitude of the pH when small additions of either acid or base is added. Buffer solutions consist of weak acid and its conjugate base usually which are mixed in relatively equal and large quantities.
Hence,
Option 1. is correct because acetic acid is a weak acid and sodium acetate is the conjugate base of it which are mixed in equal concentrations.
Option 2. is incorrect because HCl and NaCl are both strong acid and salt respectively and will not form a buffer.
Option 3. is correct which is the definition of a buffer solution.
Option 1 and 3 are correct.
<span>When two atoms come near each other, sometimes they stick together to make a molecule. One way they can stick together is by covalent bonding.</span>
<span>In covalent bonding, the atoms are unstable because their outer rings of electrons aren't filled up. By sharing electrons with other atoms, these atoms can fill up their outer rings and become stable. In water, for instance, the oxygen atom needs two more electrons to be stable, and the hydrogen
atoms each need one. When they get together, the oxygen atom shares one
electron with each of the hydrogen atoms, and the hydrogen atoms each
share one electron with the oxygen atom.</span>
Now that the atoms have become stable, it's pretty hard to knock
them back into being unstable again, so covalent bonds are strong and
molecules that form with covalent (sharing) bonds are strong molecules.
<span>Covalent bonding makes very strong connections between the atoms,
so it's hard to break these molecules apart. On the other hand,
molecules that join with covalent bonds aren't very much attracted to
each other (unlike with ionic bonding), so they move freely around each
other. That means that most molecules that form covalent bonds make
either liquids or gases, like water and carbon dioxide. The main exception is metals,
which hold together using covalent bonding but are still solids. That's
why metals are so flexible and easy to melt so you can make them into
different shapes.</span>
570/8.5=67.0 58... you only have to take the natural part, si the answer is 67 students
Try d cuz if im not mistaken if you burnt white phosphorus all the gas is going to take most the air
