A) 15 seconds. B) 1 minute. C) 2 minutes. D) 30 seconds.
D
Which of the following does NOT have a charge?
a. Electron b. Proton c. Neutron d. Molecule
380 mL of active ingredient is added to 4 L of distilled water. What is the final concentration (v/v)?
A) 1.05% B) 8.68% C) 9.5% D) 38%
