please help!!

question 2: The following model was used to show a molecule or methane, or CH4. describe the number and type of each component of the molecule.

question 3: methane (CH4) combines with oxygen gas (O2) and water (H2O). describe the number and type of atoms for a molecule of each substance.

Adouble-slit experiment is performed with light of wavelength 600 nm. the bright interference fringes are spaced 1.8 mm apart on the viewing screen.what will the fringe spacing be if the light is changed to a wavelength of 400 nm? ?

Which of the following explains why it took so long for the public to accept the negative health effects of smoking? a)people were waiting for counter reasons, and those were presented.b)scientists had not completely finalized their results, which took 30 years.c)cigarettes were cheaply available and media channels were very inefficient.d)cigarette manufacturers were trying hard to bring an alternative into the market

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?