When salt (NaCI) is added to water, it disassociates into Na and Cl-ions. Which of the following types of chemical bond is present in a salt molecule?

Question

A. Covalent bond
B. Ionic bond
C. Hydrogen bond
D. Disulfide bond
i think its B
An example of active immunity is the transfer of
A. antibodies through the placenta.
B. immunoglobulins through breastfeeding.
C. antigens through vaccination.
D. immune cells through a blood transfusion.
i think its C
Which of the following is the pH when the concentrations of hydrogen ions and hydroxide ions in an aqueous solution are equal?
A. 14
B. 7
C. 1
D. 0
i think its B
Which of the following structures is present in both prokaryotic and eukaryotic cells?
A. Golgi apparatus
B. Cell membrane
C. Endoplasmic reticulum
D. Chloroplast
i think its B

Answer 1

Hydrogen Bond C
C antigens throug vaccination
7
Cell membrane