Achange in means that a chemical has occurred?
a) the energy and mass.

b) the kinds of atoms involved .

c) the properties and identity. of the reacting substances.

d) the energy and kinds of atoms of the reacting substances.

Which type of substance ionizes partially and gives off hydrogen ions when dissolved in water? a. strong acid b. strong base c. weak acid d. weak base

1. if you have a gas at 127 degrees c, what is it's absolute temperature (kelvin)? a. 200kb. 300kc. 400kd. 500k2. if you had a gas whose absolute temperature measured 45 k, what is that temperature in celsius? a. -228 cb. -300 cc. 125 cd. 112 c

Avariable that is not being directly tested during an experiment should be