True or false: Most conducting materials have different resistances at different temperatures.

Question True or false: most conducting materials have different resistances at different temperatures. Answer 1 The answer is true. Usually, resistance increases, in case of conductor, with increase in temperature. This occurs because, the valance band and conduction band overlap with each other, so there are excess electrons in the conduction band of a conductor. With … Read more

How many lone pairs are on the central atom in bcl3?

Question How many lone pairs are on the central atom in bcl3? Express your answer numerically as an integer? Answer There are no lone pairs on the central atom. If we draw the lewis structure, we can see that all Cl atoms are all connected to the B atom. Now Cl atoms has 7 electrons … Read more

Classify each of the following substances: CO2, BF3, CO, O2, CH4

Question Classify each of the following substances:CO2, BF3, CO, O2, CH4 a) Lewis Acidb) Lewis Basec) Can act as either a Lewis Acid or Lewis Based) Neither a Lewis Acid or Lewis Base Answer Explanation: Carbon dioxide is a polar molecule whose positive center is on the carbon atom: This positive center is able to … Read more

Which of earth’s systems was most affected by fossilized dinosaurs?

Question Which of earth’s systems was most affected by fossilized dinosaurs? A. Biosphere B. Hydrosphere C. Lithosphere D. Atmosphere Answer Answer : C) Lithosphere Explanation : Lithosphere is the only sphere where fossils can be found. Lithosphere consists of the hard rocks (Crust) and the upper mantle. The imprints of the dead species on rocks … Read more