The Tolien’s test for the presence of reducing sugars (say, in a urine sample) involves treating the sample with silver ions in aqueous ammonia. The result is the formation of a silver mirror within the reaction vessel if a reducing sugar is present. Using glucose, C 6 H 12 O 6 , to illustrate this test, the oxidation-reduction reaction occurring is C 6 H 12 O 6 (aq) + 2 Ag + (aq) + 2OH – (aq) → C 6 H 12 O 7 (aq) + 2 Ag(s) + H 2 O( ℓ ) What has been oxidized, and what has been reduced? What is the oxidizing agent, and what is the reducing agent? Tolien's test. The reaction of silver ions with a sugar such as glucose produces metallic silver. (a) The set-up for the reaction. (b) The silvered test tube
The Tolien’s test for the presence of reducing sugars (say, in a urine sample) involves treating the sample with silver ions in aqueous ammonia. The result is the formation of a silver mirror within the reaction vessel if a reducing sugar is present. Using glucose, C 6 H 12 O 6 , to illustrate this test, the oxidation-reduction reaction occurring is C 6 H 12 O 6 (aq) + 2 Ag + (aq) + 2OH – (aq) → C 6 H 12 O 7 (aq) + 2 Ag(s) + H 2 O( ℓ ) What has been oxidized, and what has been reduced? What is the oxidizing agent, and what is the reducing agent? Tolien's test. The reaction of silver ions with a sugar such as glucose produces metallic silver. (a) The set-up for the reaction. (b) The silvered test tube
The Tolien’s test for the presence of reducing sugars (say, in a urine sample) involves treating the sample with silver ions in aqueous ammonia. The result is the formation of a silver mirror within the reaction vessel if a reducing sugar is present. Using glucose, C6H12O6, to illustrate this test, the oxidation-reduction reaction occurring is
C6H12O6 (aq) + 2 Ag+(aq) + 2OH–(aq) → C6H12O7(aq) + 2 Ag(s) + H2O(ℓ) What has been oxidized, and what has been reduced? What is the oxidizing agent, and what is the reducing agent?
Tolien's test. The reaction of silver ions with a sugar such as glucose produces metallic silver. (a) The set-up for the reaction. (b) The silvered test tube
Definition Definition Chemical reactions involving both oxidation and reduction processes. During a redox reaction, electron transfer takes place in such a way that one chemical compound gets reduced and the other gets oxidized.
In each case (more ductile, more brittle, more tough or resistant), indicate which parameter has a larger value.
parameter Elastic limit Tensile strength
more ductile
Strain at break Strength Elastic modulus
more fragile
more tough or resistant
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