Given the equation: 2c2h2 (g) + 5o2 (g) → 4 co2 (g) + 2h2o(g)how many moles of oxygen are required to react completely with 1.0mole of c2 h2 ? (1) 2.5 (3) 5.0(2) 2.0 (4) 10

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

How are the terms group and period used on the periodic table

Substance 33°f 100°f peanut oil solid liquid margarine solid liquid chocolate chips solid liquid which conclusion fits the data in the table? a. heat chemically changes chocolate and margarine. b. all solids become liquid at 100°f. c. removing heat from a substance it to melt. d. matter may change shape when it is heated.