Calculate δgrxn for this equation, rounding your answer to the nearest whole number. caco3(s) → cao(s) + co2(g) δgf, caco3 = −1,128.76 kj/mol δgf, cao = −604.17 kj/mol δgf, co2 = −394.4 kj/mol

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line