When is di - used in the name of a hydrocarbon?

when the main chain contains two carbon atoms

when there are two different substituents

when there are two main chains of equal length

when there are two identical substituents

What is the greatest question facing the human race?

which statement best explains why objects are pulled toward earths center? A. earth has a magnetic force that is strongest at its core. B. earth has a much greater mass than objects on its surface. C.

Harry is doing a research project on the movement of plants from the ocean to land. He leaned that plants evolved vascular tissues, which enabled them to pull water from the ground and survive on land.

The numerator is the blank number in a fraction, while the denominator is the blank number in a fraction

Show ur working: What mass of sulfur trioxide is formed from 96g of sulfur dioxide? 2 SO2+O2 - > 2 SO3

Which of the following transitions would release energy? n=2->n=3 n=1 - > n=3 n=3 - >n=1 n=3->n=2

Which animal group actually saw a drop in the number of endangered and threatened species between 1995 and 2005? a Fish b. Reptiles c. Birds d. Mammals

Why does burning fossil fuels put ecosystems under pressure?

What is the quantum number set of the ground-state electron that is found in helium (He) but not in hydrogen (H) ? (1, 0, 0, - ½) (1, 0, 1, - ½) (1, 1, 0, - ½) (1, 1, 1, - ½)

What must be true in order for magnetism to induce an electric current in a wire? There needs to be a switch in the circuit. There cannot be a switch in the circuit. The wire must be part of a closed circuit. The wire must be part of an open circuit.