1. Tadpole noodles are made from corn.

2. Tadpole noodles are made of corn.

(Which one is right?)

3. She is going to go for a hike.
4. She is going to go hiking.
5. She is going to go on a hike.
6. She is going to go out for a hike.

(Are the four sentences all grammatical? Which one is commonly used?)

Both 1 and 2 are correct.

All of the next 4 sentences are also correct. The most common ones are 4 and 5.

1. Both sentences are grammatically correct. However, they express slightly different meanings. Sentence 1, "Tadpole noodles are made from corn," suggests that corn is one of the ingredients used to make the noodles, but it does not necessarily mean that the noodles are made entirely from corn. Sentence 2, "Tadpole noodles are made of corn," implies that corn is the main or only ingredient in the making of the noodles.

2. All four sentences are grammatically correct and can be used interchangeably to convey the same meaning. However, there may be slight differences in emphasis or stylistic preference in certain contexts.

Sentence 3, "She is going to go for a hike," simply states that she will engage in the activity of hiking.
Sentence 4, "She is going to go hiking," uses the verb "hiking" as a gerund, emphasizing the activity itself.
Sentence 5, "She is going to go on a hike," implies that she will participate in a specific hike, emphasizing the particular hike.
Sentence 6, "She is going to go out for a hike," adds the phrase "out for," which implies going somewhere to engage in the activity of hiking.

Overall, the choice between these sentences depends on personal preference or the specific context in which they are being used.