One problem with reductive amination as a method of amine synthesis, is that by-products are sometimes obtained. for example, reductive amination of benzaldehyde with ethylamine leads to the expected product, n-methylbenzylamine. however, significant amounts of an-methylbenzylamine are also recovered. draw curved arrows to show the movement of electrons in this step of the reaction mechanism leading to the by-product

Sandy is building a small toy car. he wants to use a balloon to power the toy car. he fills a balloon with air and then attaches a straw to the balloon. he tapes the balloon-straw combination to the car and then releases the end of the balloon. the toy moves forward as the air from the balloon comes out the back of the straw. what can sandy do to make the toy car move faster? a) use less air in the balloon. b) blow up the balloon more. c) use a longer straw. d) use larger tires.