When two substances A and B are mixed together in a pestel and mortar, a large amount of heat is evolved and a new substance C is formed. C has the properties different from A and B. Is C an element, compound or a mixture?

When two substances X and Y were made to combine, another substance Z was formed. Following observations were recorded : (a) Large amount of heat was evolved when X and Y were made to combine. Predict the nature of the substance Z.

Two substances A and B combine together to produce a new substance C. The properties of C do not tally with those of A and B. A and B cannot be separted into simpler substance by any chemical means . Which of the following statements is ( are ) correct about the formation of C?

Iron powder and sulphur powder were mixed together were mixed together and divided into two parts A and B. when part A was heated strongly over a burner , then a substance C was formed , the part B was however , not heated at all .when dilute hydrochloric acid was added to substance C , then gas D was evolved and when dilute hydrochloric acid was added to part B them gas E was evolved . (a) what type of substance is B ? (b) what type of substance is c? (c ) Name the gas (i ) D, and (ii) E (d) state one characteristic property fo gas D. (e ) Write one test to identify gas E.

When equal volumes of two substances are mixed together, the specific gravity of the mixture is 5. But when equal weights of the same substance are mixed together, the specific gravity of the two is 3. Find the specific gravity of two substances.