Explanation:
a) Barium
b) The metalloid in third period is Silicon
c) Group 4A (or IVA) of the periodic table includes the nonmetal carbon (C)
d) At this temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine and astatine are solids.
e) osmium
f) chlorine (Cl, element 17) are a gas at room temperature, and is found as diatomic molecule (Cl2).
Answer:
WCl₂, WCl₄, WCl₅, WCl₆
Explanation:
Molar Mass of Tungsten = 184 g/mol
Mass of Chlorine = 35.5 g/mol
In the first compound;
Percentage of tungsten = 72.17 %
Upon solving;
72.17 % = 184
100 % = Total mass
Total mass of compound = 254.95g
Mass of chlorine = 254.95 - 184 = 70.95 (Dividing by 35.35; This is approximately 2 Chlorine atoms.
The Formular is WCl₂
In the second compound;
Percentage of tungsten = 56.45 %
Upon solving;
56.45 % = 184
100 % = Total mass
Total mass of compound = 325.95 g
Mass of chlorine = 325.95 - 184 = 141.95g (Dividing by 35.35; This is approximately 4 Chlorine atoms.
The Formular is WCl₄
In the third compound;
Percentage of tungsten = 50.91 %
Upon solving;
50.91 % = 184
100 % = Total mass
Total mass of compound = 361.42 g
Mass of chlorine = 361.42 - 184 = 177.42 (Dividing by 35.35; This is approximately 5 Chlorine atoms.
The Formular is WCl₅
In the fourth compound;
Percentage of tungsten = 46.39 %
Upon solving;
46.39 % = 184
100 % = Total mass
Total mass of compound = 396.64 g
Mass of chlorine = 396.64 - 184 = 212.64 (Dividing by 35.35; This is approximately 6 Chlorine atoms.
The Formular is WCl₆
Answer:
88.5 % of the raw ore is CuSO4*4H2O
Explanation:
Step 1: Data given
Mass of the ore = 10.854 grams
Mass of water = 2.994 grams
Step 2: Calculate moles H2O
Moles H2O = mass H2O / molar mass H2O
Moles H2O = 2.994 grams / 18.02 g/mol
Moles H2O = 0.166 moles
Step 3: Calculate moles CuSO4*4H2O
For 1 mol CuSO4*4H2O we have 4 moles H2O
For 0.166 moles H2O we have 0.166/4 = 0.0415 moles CuSO4*4H2O
Step 4: Calculate mass CuSO4*4H2O
Mass CuSO4*4H2O = moles * molar mass
Mass CusO4*4H2O = 0.0415 moles * 231.67 g/mol
Mass CuSO4*4H2O = 9.61 grams
Step 5: Calculate mass % of CuSO4*4H2O
Mass % = (9.61 grams / 10.854 grams )*100 %
Mass % = 88.5 %
88.5 % of the raw ore is CuSO4*4H2O
Answer:
false
Explanation:
It is called the periodic table because of the way the elements are arranged. You'll notice they're in rows and columns. The horizontal rows (which go from left to right) are called 'periods' and the vertical columns (going from up to down) are called 'groups'.
<span>Answer:
Boyle began to detach chemistry from the mysticism of alchemy. He declared that most followers of alchemy were not interested in the fundamental causes of phenomena and instead looked to.</span>
