What is the main function of the immune system?

To provide energy for the body

To circulate blood and nutrients

To defend against pathogens

All of the above

Which of the following best describes the particles in a liquid? A. far apart and easily compressible B. far apart and almost incompressible C. close together and easily compressible D. close together and almost incompressible

Nitrogen has atomically mass of about 14 amu and a atomic number of 7. how many neutrons does nitrogen have?

What is the molality of a solution prepared by dissolving 82.2 g of ethylene glycol, hoch2ch2oh, in 1.50 l of water? assume the density of water is 1.00 g/ml?

A mixture of nacl and sucrose (c12h22o11) of combined mass 10.2 g is dissolved in enough water to make up a 250 ml solution. the osmotic pressure of the solution is 7.75 atm at 23°c. calculate the mass percent of nacl in the mixture.

Titration of 25.00 ml of an unknown hcl solution with 0.1550 m naoh starts at a buret reading for naoh of 0.33 ml. the phenolphthalein indicator turns light pink in the acid solution for over 30 seconds at a buret reading of 24.19 ml.

Plants absorb light energy and store that energy in the form of what? A water B carbon dioxide C sugar D oxygen

If 21/825g hydrogen sulfate ion in 5litr water solotion, what the percentage of its ionization?

A redox reaction will occur at 298 K when zinc metal is placed in a solution that is 0.5M Fe (NO3) 3. Is this true or False.

Sodium chloride is stirred into water to form a solution. in this case, what are sodium chloride and the water?

1. A liquid is matter because it a) is hard, b) has its own shape, c) has mass and takes up space. d) living things could not survive without it.