The molecular formula of Astatine is At2, and it belongs to halogen family.

There are two types of Fe, and they are Fe2+ and Fe3+.

75.80/58.5=1.30 mol, 1.30*1000/250.0=5.2 mol/L, so the molarity of the solution is 5.2 mol/L.

0.314*417/1000=0.13 mol, 0.13*62=8.06 grams, so the mass of MgF2 is 8.06 grams.

M=3.75/1.17=3.2 Liters, so the volume of the liquid is 3.2 Liters.

Laboratory thermometer can be used to control temperature, and it can also be used to measure temperature.

Hydrophilic matters will dissolve in water, such as NaCl, MgSO4 and so on.

Al is oxidized and Br2 is reduced in the reaction. Al is reductant and Br2 is oxidant.

White precipitate will be produced, and the ionic equation is Ag++Cl-=AgCl.

Siemens involved in electricity, and he invented the first electric generator.

Because metals contain free electrons, while solution can conduct electricity because of it contains ions.

No, because sugar is hydrophilic material, and it can dissolve in water.

Yes, because the products are not harmful to people, and the equation is Ca(ClO)2+NaHCO3=CaCO3+NaClO+HClO.

John Dalton and Botanist Robert Brown studied atom, and John Dalton used atom explained law of multiple proportions.

Margarine is a mixture, so it doesn't have a chemical formula, and its main composition is Trans Fatty Acids.

Yes, Thyroxine can't dissolve in water and alcohol. And it can dissolve in aqueous alkali.

The formual of sulfui trioxide is SO3, so it contains 3 moles oxygen atoms.

No, it is a strong electrolyte, because it can complete ionize in the water.

The ionic equation is Ag++PO43-=Ag3PO4, and Ag3PO4 is a precipitate.

Bromine and Iodine normally from 4 covalent bonds, and they are +1, +3, +5 and +7.