Dr. waters found an old bottle of dilute hydrogen peroxide in her refrigerator and needs your in determining the percent hydrogen peroxide that still may be present. she knows that by keeping the hydrogen peroxide cold and in the dark that it will have a longer shelf-life. but she has moved several times and does not know how old the dilute hydrogen peroxide is that remains. we are providing you with a standardized solution of potassium permangangate of 0.1057 m that you will use in the buret as the titrant. you will use a 20.00 ml sample of that old dilute hydrogen peroxide and determine the percent by mass. the beginning volume in the buret was 0.75 ml and the final volume to be 29.79 ml which allowed a faint pink color to persist for 30 s.

Quickly! brainliest if two people answer! 1. the blood has red blood cells, white blood cells and platelets. red blood cells carry oxygen to other cells in the body. cells need oxygen to live. white blood cells destroy certain germs. they protect our bodies from disease. which question is answered in this paragraph? (a) what is the role of blood vessels? (b) what type of cells are attached to bones? (c) what type of blood cell to clot your blood? (d) what are the different types of blood cells? 2. which sentence from the section "stem cells" best explains the role of stem cells? (a) when one kind of cell stops working, stem cells can . (b) they can turn into that cell and take its place. (c) scientists are studying new ways to use stem cells. (d) these cells can people heal faster. 3. read the selection from the section "nerve cells." nerve cells send messages to the rest of our bodies. these messages move between the brain, spinal cord and various organs. nerve cells are also called neurons. fill in the blank. a "neuron" is a (a) cell that moves information from the brain to other parts of the body (b) stem cell that has both an axon and a dendrite (c) cell that controls the fingers of a body (d) cell that makes up the spinal cord 4. some muscles in our body move without us telling them to. these are called involuntary muscles. some examples are the cardiac muscle cells inside the heart. these cells the heart relax and fill with blood. what is the best definition of "involuntary" based on the context clues? (a) something that happens on its own (b) trying hard to do something (c) something moving back and forth (d) easily moved

What diagram shows the ionic compound of magnesium oxide

In the reaction between a crushed antacid tablet and vinegar what gas is emitted