Chemistry Answers

How much table salt should be added to 300 g water to lower its freezing point to -2.00°C? 

Identify label the compound which is bronsted acid, base, and conjugate acid, conjugate base of H2CO3 + H2O _____H3O+ + HCO3–

What is the systematic name for Cu(CH₃CO₂)₂

A sample of benzoic acid solution in soda is 0.50% by mass. What is the benzoic acid is present in 150 g solution?

How many ammonia molecules are there in 0.50 ammonia moles? Overall, are these nitrogen and hydrogen atoms present?

Write balanced molecular equations for the following reactions in aqueous solution:

a) calcium + water à calcium hydroxide + hydrogen

b) barium chloride + sodium barium à sulfate sulfate + sodium chloride

In a Daniell stack the following redox reaction occurs:

Zn(s) + ^Cu2+(aq) à Zn2⁺⁽aq) + Cu(s)

a) write the oxidation and reduction semi-reactions , also indicating the electrons at stake and the oxidation numbers of the reactants and products.

b) what reaction would take place in an electrolytic cell? 

Determine the moles of solute particles dissolved in 1.0 Kg of water, for the following solutions:

a) CH₃CH₂OH, 2.0 m; b) KCl, 2.5 m; c) Al₂(SO₄)₃, 1.0 m; d) C₁₂H₂₂O₁₁ (saccarosio), 3.0 m; e) HNO₃, 2.0 m

Is element 115 likely to be a metal or a nonmetal?

a. The diagram below shows an electrochemical cell:

i. Write schematic representation of the cell