Rights of vendor as to reclamation of goods where contract rescinded for fraud. Rescission for nonperformance. Article 5 Requirements as to performance of contractual obligations generally. Effect of act of God. Effect of refusal of party to perform concurrent condition upon offer of performance by other party. Effect of nonperformance caused by conduct of other party. Requirements for and effect of tender generally. Tender of chattels. Delivery on demand; delivery at certain time and place. Article 3 Payment 13-4-40. Payment by mail.