Which sentence uses the word effect correctly

1. how does the storm effect the crops?
2. which was the major effect of the civil war?
3. i know that my decision will effect my grade.
4. the dog attack will effect the leash laws in city park.

For which one of the following reactions is the value of δh° rxn equal to δh° f for the product? a. 2 h2 (g) + o2 (g) → 2 h2o (l) b. n2 (g) + o2 (g) → 2 no (g) c. 2 h2 (g) + o2 (g) → 2 h2o (g) d. h2o (l) + 1/2 o2 (g) → h2o2 (l) e. none of the above

What layer of the atmosphere is directly above the troposphere?

Name the intersection of plane bpq and plane cpq.