Chemistry Answers

how many grams of copper would have to react to produce 89.5 g of silver

Write the formulas of the following compounds:

      (a) chlorine dioxide

      (b) dinitrogen tetroxide

      (c) potassium phosphide

      (d) aluminum nitride

      (e) silicon dioxide

using the periodic table, classify each of the following elements as a metal or a nonmetal, and then further classify each as a main-group (representative) element, transition metal, or inner transition metal:

a) uranium

       (b) bromine

       (c) strontium

       (d) neon

       (e) gold

Write the symbol for each of the following ions: 

     (a) the ion with a 1+ charge, atomic number 55, and mass number 133

     (b) the ion with 54 electrons, 53 protons, and 74 neutrons

     (c) the ion with 24 electrons, 30 neutrons, and a 3+ charge

1. How are electrons and protons similar? How are they different?
2. How are protons and neutrons similar? How are they different?

According to the following reaction, how many grams of water will be formed upon the complete reaction of 23.3 grams of iron(III) oxide with excess hydrochloric acid?

6HCl (aq) + Fe₂O₃ (s) 3H₂O (l) + 2FeCl₃ (aq)

Consider the titration of a 25.0 mL sample of 0.1 75 mol L- 1 CH3NH2 with 0. 150 mol L-1 HBr. Determine each quantity: Show all the chemical equations used.

a. the initial pH 

b. the volume of added acid required to reach the equivalence point

c. the pH at 5.0 mL of added acid

d. the pH at one-half of the equivalence point

e. the pH at the equivalence point

f. the pH after adding 5.0 mL of acid beyond the equivalence point

Calculate the : 1) average speed 2) root mean square speed and 3) most probable speed of oxygen molecule at 515k. {Given Mm(O2)= 0.016Kg mol(–1)

25 cm³ of a solution containing T grams of K₂CO₃ in 1000 cm³ of solution were completely neutralized by 20.00 cm³ of a solution containing 0.025 mole of H₂SO₄ in 1 dm³ of solution

Calculate the :

(a) concentration of K₂CO₃ solution in moldm^-3

(b) Value of T

(c) mass of K₂SO₄ formed

(d) volume of CO₂ evolved at STP

(e) number of H₂O molecules

The reaction of methylpropene with HBr, under radical conditions, gives two

intermediates. Propose a mechanism for the formation of the two products.