HELP! i have NO idea what so ever about cars and its function and i wind up with a car chemistry problem...

Question

please help! TYVM!!! ~ :]

3. One cold morning your car does not start. Make two hypotheses about why the car will not start.

4. Suppose you try several experiments with your car. You try a battery jump, which does not work. There seems to be enough gas in the car. You wiggle a wire in the engine, and the car starts on the next try. Explain how these tests help you decide what was wrong with the car.

5. a. Propose a hypothesis for the observation. That moisture forms on the outside of a cold glass.

b. Describe an experiment that you could do to test it.

Answer 1

Q 3.

Gasoline must be vaporized to burn and it evaporates slowly in the cold. (Sometimes people spray ether into their engines to get them started - ether evaporates faster than gasoline in cold weather.)

Chemical reactions in cold batteries are slower so the battery produces fewer electrons - making it too weak for the starter motor.

Q4.

By using the battery jump test and checking the level of gas, you are eliminating any possible factors restricting the cars operation. This narrows the possible problems down to the loose wire in the engine which allows the car to start.

Q5.

When the temperature of the exterior surface of the glass is cooled below the dew point of the outside air, moisture forms on the exterior

side of the glass. Then, as the glass temperature rises above the dew point, the moisture evaporates back into the air.

Q5B

Place a cold glass inside a high humidity room and a low humidity room to test whether this is the reason for the moisture forming. Repeat this test with a warm glass to check whether the temperature of the glass is important