4. An exothermic reaction causes the surroundings to(A)warm up.(B)become acidic.(C)expand.(D)decrease its temperature.

10. Which of the following statements is false?(A)For monoelectron atom, the 4s orbital lies lower in energy than the 5s orbital.(B)For a potassium atom, a 4s orbital, a 4p orbital, and a 4d orbital all have the same energy.(C)For a hydrogen atom, a 4s orbital, a 4p orbital, and a 4d orbital all have the same energy.(D)The 4s orbital lies lower in energy than the 3d orbital for atoms K, Ca, Sc, and Ti.

4. An exothermic reaction causes the surroundings to

(A)warm up.

(B)become acidic.

(C)expand.

(D)decrease its temperature.

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