1. The equation for the reaction between zinc and aqueous copper(II) sulfate is shown. Zn + Cuso, → ZnSO, + Cu

Which statement is correct?

a. The oxidation state of the oxidising agent has changed from 0 to +2.

b. The oxidation state of the reducing agent has changed from 0 to +2.

c. The oxidation state of the reducing agent has changed from +2 to 0

d. This is not a redox reaction. The solution changes from colourless to blue.

2. Complete these half-equations. Balance the charges by adding electrons. State whether oxidation or reduction has taken place.

1. Pb4+ + 2e—>
2. Br1- —>+
3.O2 +—> O2-

3. When aqueous iron(III) chloride is added to aqueous potassium iodide occurs and iodine is formed.

Which statement is correct?

a. lodide ions are oxidised, they gain electrons in this reaction.

b. Neither iodide ions nor iron (III) chloride is oxidised in this reaction.

c. lodide ions are oxidised, they lose electrons in this reaction.

d. Iron (III) chloride is oxidised in this reaction.

idk

explanation:

dasdad

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.