6. Copper (Cu) in its pure form is a reddish-brown metallic element with high ductility and malleability that is an excellent conductor of heat and electricity: atomic weight 63.54; atomic number 29; density 8.94 g/cm3; melting point 1083°C; and boiling point 2595°C.
7. Groups and periods are two ways of categorizing elements in the periodic table. Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.
8. Zinc sulfate
a. Well the atomicity of sulfur is 8. It means q sulfur molecules contain 8 sulfur atoms. Total no of atoms is 8*avogadro's number.
b. Hydrogen (H2), oxygen (O2), and chlorine (Cl2) molecules, for example, each contains two atoms. Another form of oxygen, ozone (O3), has three atoms, and sulfur (S8) has eight atoms. All elemental molecules are made of atoms of a single element.
9. Lithium Solfate
a. 2
b. 3
10. Aluminium Sulfiate
The subscript multiplies everything in ( ). the formula for aluminum sulfate is Al2(SO4)3. Then, in a formula unit of Al2(SO4)3 there are two aluminum ions and three sulfate ions; or two aluminum, three sulfur, and twelve oxygen atoms.
In this case, Al2 means 2 aluminum, (SO4) 3 means 3 (SO4) S. The brackets indicate that 3 must be multiplied by the number of atoms of each element: 3x1 sulfur, 3x4 oxygen. Now the number of votes: 2 aluminum atoms + 3 sulfur atoms + 12 oxygen atoms = 17 atoms in total in each molecule.
11. Bubbles formed when the two solutions were combined.
12. Density = Mass/Volume
The mass is 965 g
The volume is 50cm³
965 g / 50 cm ³
= 19.3 g/ cm³
