Question

C. Alcohol evaporates D. Perfume smells 9- Whish of the following does not contain chemicals A. orange juice B. sun light C bread D. Tylencl 10- Valence electrons are electrons located A) in the outermost energy level of an atom B) in the nucleus of an atom C) in the innermost energy level of an atom D) throughout the atom 11- The atom with 79 protons is A. O B. C C. Au D. Ar 4 12- Select the correct formula for potassium chloride A. CIK c. KC D. CIK 13- The name of CaO is: A. monocalcium monoxide B. calcium oxide C. calcium monoxide D. monocalcium oxide 14- Which one is wrong? A. CaCl B. HO C. KCI D. CIK 15- Consider an isotope of sodium with a mass number of 25. The number of neutrons in this sodium is A) 11 B) 14 C) 16 D) 25 of 16- How many molecules are in O.150 mole of aspirin, CoHO4? A. 9.03 x 10 B. 4.01 x 10 C. 0.602 x 102 D. 6.02 x 10

Answer 1

9)

sunlight do not have chemicals

they are just electromagnetic wave that contains photons

Answer: B

10)

valence electrons are outermost electrons

Answer: A

11)

atomic number = number of proton = 79

atomic number is 79 for gold (Au)

Answer: C

12)

potassium is K

chloride is Cl-

the compound is KCl

Answer: C

only 4 parts at a time