Imagine that you are a supervisor of a laboratory. your group is analyzing a sample of stream water that has high levels of an anion contaminant. you know that the sample contains either chloride, sulfate or carbonate. you have a new student intern and you have them do the analysis of the sample using solutions of sr2+, pb2+ and zn2+. the intern carries out a similar investigation as the one you did in this lab. the results of the reactions between each of the cations with each of the anions is the same as your results. the intern then goes on to do the test on the stream sample. here is an excerpt from the intern’s report about the test on the stream sample.15 drops of stream water was placed in a test tube using a 1 ml plastic pipet. 5 drops of 0.10 m sr2+solution was added to the stream water, one drop at a time, with shaking between each drop to mix the solutions. i observed a white, cloudy precipitate form in the solution. this reaction was the same as the reaction i saw when i did a control reaction between a solution of sr2+ with a solution of so42-. therefore, i conclude the anion in the stream sample is so42-.do you agree or disagree with the intern’s conclusion about the identity of the anion in the stream? provide some constructive criticism of the intern’s work, explaining why you either agree or disagree with the intern’s conclusion. explain what further tests would be needed to convince you of the identity of the anion, or, explain why you are convinced that the intern is correct. ( i need a full answer)

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

When water dissolves sugar, which process is not involved? o dissociation o hydration o surface area of the solute increases sa

What is conserved in the reaction shown below? h2(g) + cl2 (g) --> 2hcl(g)a. mass onlyb. mass and moles onlyc. mass, moles, and molecules onlyd. mass, moles, molecules, and volume