Need help on homework. Finished it but not sure if they are correct. This is work is worth many pts.?

Question

20) Which molecule is nonpolar and has a synnnetrical shape?
A) NH3
B) CH4
C) H20
D) HCI

24)Which type of bond exists in a molecule of hydrogen iodide?
A)a polar covalent bond with an electronegativity difference ofzero
B)a polar covalent bond with an electronegativity difference between zero and 1.7
C)a nonpolar covalent bond with an electronegativity difference between zero and 1.7
D) a nonpolar covalent bond with an electronegativity difference ofzero

25)Which compound has the greatest possible number of isomers?
A) ethane B) pentane C) butane D) propane

27)Which combination of atoms can form a polar covalent bond?
A) Na and Br B) N and N C) H and Br
D) H and H

28) What is the total number of pairs of electrons represented by dashes (-) in the structural formula H- C _=_ C - H ? between the two C's it is a Triple line.
A) 10
B) 4
C) 5
D) 8

29)Which compound is'a synthetic polymer?
A) cellulose B) nylon C) protein D) starch

Answer 1

20) B. CH4
24) C. nonpolar with difference between 0 and 1.7
25) B. pentane (more carbons to branch)
27) C. H and Br
28) C. 5 pairs - 3 between carbons and one on each end between carbon and hydrogen
29) B. nylon

Answer 2

. as a results of fact a single guy did no longer get moist; the 4 adult adult males all have been given moist jointly. (or they have been all married adult adult males) 2. She had already placed sugar interior the tea and whilst she tasted the "new" tea it become already candy, meaning it become honestly the previous tea.... or the fly could have nevertheless been interior the tea! 3. A river 4. mom, racecar,and WOW