MCQs || B21

The chemicals that are created in a chemical reaction.

Oxidation and reduction

half-reaction has electrons as reactants

Oxidation ...... electrons

The reducing agent = reduced

Voltaic cells

oxidation number of N in NO₂-

oxidation number H in BaH₂

Which of the following has the most number of O?

Which elements are(is) not balanced? LiNO₃ +CaBr2 --> Ca(NO₃)₂ + LiBr

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

Finish a blalanced equation: Mg(OH)₂--> __________

Number of H in 3(NH₄)₂CrO₄

Chemical equation show

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂ --> 2Al₂ O₃

Balance this equation _Zn+_HCl-->_ZnCl2 +_H2

What is a coefficient?

A substance can be lost or gained in a chemical reaction

Which problem is balanced?

Fill in the blanks with coefficient: PCl5+_ H2O→_ HCl+H3PO4