Which of the following is a serious source of experimental error? a. The sodium hydroxide is not mixed completely in the Florence flask.
b. The buret is not conditioned.
c. The KHP samples are dissolved in 50 mL (not 25 mL) of distilled water.
d. Two drops (not one drop) of phenolphthalein indicator is used.
e. Bubbles are not cleared from the tip of the buret.
f. The Erlenmeyer flasks are not dry before pipetting the vinegar samples.

the answer is true.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

answer: cellular respiration takes in food and uses it to create atp, a chemical which the cell uses for energy. usually, this process uses oxygen, and is called aerobic respiration. it has four stages known as glycolysis, link reaction, the krebs cycle, and the electron transport chain.