Answer:
When halogen elements react with group one metals they form halide salts.
Explanation:
The elements of group 17 are called halogens. These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine. Halogens are very reactive these elements can not be found free in nature. Their chemical properties are resemble greatly with each other. As we move down the group in periodic table size of halogens increases that's way fluorine is smaller in size as compared to other halogens elements. Their boiling points also increases down the group which changes their physical states. i.e fluorine is gas while iodine is solid.
When halogen elements react with group one metals they form halide salts.
Alkali metals have one valance electron and halogens needed one electron to complete the octet thus alkali metals loses one electron which is accepted by halogens atom and form ionic compound called halide salts.
For example:
2Na + Cl₂ → 2NaCl
2K + Cl₂ → 2KCl
2Rb + Cl₂ → 2RbCl
2Li + Cl₂ → 2LiCl
With bromine:
2Na + Br₂ → 2NaBr
2K + Br₂ → 2KBr
2Rb + Br₂ → 2RbBr
2Li + Br₂ → 2LiBr
With iodine:
2Na + I₂ → 2NaI
2K + I₂ → 2KBI
2Rb + I₂ → 2RbI
2Li + I₂ → 2LiI
An Arrhenius base is a substance that increases the concentration of OH- ions in a water solution.
A base has a high pH, whereas an acid has a low pH and increases the concentration of H+ ions in a solution.
Hope this helps!
Answer:
The answer to your question is Percent by mass = 43.2
Explanation:
Data
Ca(OH)₂
Percent by mass of Oxygen = ?
Process
1.- Calculate the molecular mass of Ca(OH)₂
Ca(OH)₂ = (40 x 1) + (16 x 2) + (2 x 1)
= 40 + 32 + 2
= 74 g
2.- Calculate the mass of Oxygen = (16 x 2)
= 32 g
3.- Calculate the percent by mass
Percent by mass = (mass of oxygen/mass of Ca(OH)₂) x 100
Percent by mass = (32/74) x 100
Percent by mass = 43.2
When you heat up water, the water molecules start moving around faster and faster. ... So hot water is less dense than cold water. When you put the two together with the hot water on the bottom, the hot water rises to the top, mixing with the cold water along the way and creating purple water.
The balanced chemical equation for this is:
C3H8 + 5 O2
--> 3 CO2 + 4
H2O
So we can see that for every 1 mole of C3H8, 2219.9 kJ of
energy is released. Hence the total number of moles of C3H8 required is:
moles C3H8 = 2.45×10^6 kJ / (2219.9 kJ / mol)
moles C3H8 = 1103.65 mol
The molar mass of C3H8 is 44.1 g/mol, therefore the mass
is:
mass C3H8 = 1103.65 mol * 44.1 g/mol
mass C3H8 = 48,671.11 grams = 48.67 kg
