Chemistry

Determine the oxidation number of chromium (Cr) in each of the following compounds.

(1) CrO2 +4 (2) Cr2O72− +6 (3) Cr2(SO4)3 +3

According to the reaction below, how many moles of Cu2CO3(s) can be produced from 125 mL of 0.198 M CuNO3(aq)? Assume that there is excess Li2CO3(aq).

.0124

In a precipitation reaction between FeCl2(aq) and LiOH(aq), 11.8 mL of 0.210 M FeCl2(aq) completly reacted with 36.1 mL of LiOH(aq). What was the molarity of LiOH(aq)?

.137

Consider the chemical reaction below, Cd + NiO2 + 2H2O ⟶ Cd(OH)2 + Ni(OH)2 Determine if each of the following statement is True or False.

1. The oxidation state of Ni in NiO2 is +2. False 2. The oxidation state of H in H2O is the same as that in Ni(OH)2. True 3. Cd loses electrons to form Cd2+ as in Cd(OH)2. True 4. NiO2 is the oxidizing agent. True

Given a balanced chemical equation between H2SO4(aq) and KOH(aq) H2SO4(aq) + 2 KOH(aq) → K2SO4(aq) + 2 H2O(l) What volume (in mL) of 0.43 M H2SO4(aq) solution is necessary to completely react with 120 mL of 0.35 M KOH(aq)?

48.8

An acid-base reaction occurs when Ba(OH)2(aq) and HBr(aq) are mixed together. Identify the acid, the base, and the two products that are formed in this reaction. If an option below does NOT match acid, base, or the two products that are formed, select "not an acid, or a base or the products formed".

Ba(OH)2(aq) base HBr acid BaBr(aq) + H2O(l) not BaBr2(aq) + H2O(l) Two products

When CuNO3(aq) and Li2CO3(aq) are mixed, which precipitate forms (if any)?

Cu2CO3

Determine if each of the given compounds is an Arrhenius acid, or an Arrhenius base or neither.

H2SO4 acid NaCl neither KOH base HBr acid

Determine if each of the ionic compounds is soluble or insoluble. (1) K2CrO4 (2) AgCl (3) PbSO4 (4) Cu(OH)2

Soluble Insoluble Insoluble Insoluble

Consider 0.022 grams of H2(g) produced by the following chemical reaction, 2 HCl(aq) + Mg(s) → MgCl2(aq) + H2(g) Determine if each of the following statements is True or False

The reaction requires 0.795 grams of HCl(aq). True This reaction also produces 1.04 grams of MgCl2(aq). True The number of moles of the reactants consumed will equal the number of moles of the products made. False