Chemistry

Suppose an EPA chemist tests a 250.mL sample of groundwater known to be contaminated with nickel(II) chloride, which would react with silver nitrate solution like this: NiCl2(aq) + 2AgNO3(aq) 2AgCl(s) + NiNO32(aq) The chemist adds 15.0mM silver nitrate solution to the sample until silver chloride stops forming. He then washes, dries, and weighs the precipitate. He finds he has collected 5.8mg of silver chloride. Calculate the concentration of nickel(II) chloride contaminant in the original groundwater sample. Round your answer to 2 significant digits.
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Which has a higher temperature: a snowman or a lit match?Group of answer choiceslit matchsnowmanNo answer text provided.
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How many grams of silver nitrate are required to produce 3.00 g of silver phosphate?
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True or false: All heterotrophs are omnivores.
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What does the article Absolute Zero tell us about what temperature really means?
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what physical properties does radium have
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Imagine the tarantula lost their fangs and the lion lost their sharp teeth. What do you think would happen?
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Can somebody please help me with this I only have 10 minutes and I have to do other work please do all three questions in the pictures!
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A compound containing 5.93% H and 94.07% O has a molecular mass of 34.02 g/mol determine the empirical and Molecular formula Of this compound
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Use Lewis dot structures to show the ionic bonding in the following pairs of elements. Show the transfer of electrons using arrows. Write the correct chemical formula for the ionic compound that forms. 1) barium oxide (Ba and O) 2) sodium oxide (Na and O) 3) calcium chloride (Ca and Cl) 4) sodium nitride (Na and N) 5) aluminum oxide (Al and O) 6) magnesium phosphide (Mg and P)
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help, if anyone knows the correct answer??
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At standard pressure, a sample of oxygen occupies 31 ml. What volume does the gas occupy when the pressure is 2 atm?
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I really like chemistry but no barely anything about it so could you tell me something about it please
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A sample of hydrogen gas has a volumeof 65.0 mL at a pressure of 0.992 atmand a temperature of 16C. Whatpressure will the hydrogen gas havewith a volume of 68.0mL and atemperature of 25C?
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Balance this equation. C(s)+H2(g) -> CH4(g)
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Would fire extinguishers that produce Carbon Dioxide (CO) gas be more effective infighting ground fires or ceiling fires? Explain.
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A compound consists of 3 moles of carbon and 4 moles of hydrogen. What is the empirical formula of this compound?Group of answer choicesCH4C3H3C3H4C4H3
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Which of the following samples of baking soda wold react the fastest withvinegar? *1 pointpowderthey all react at the same rateO small crystalsmall cube
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How many molecules are there in 4.3 moles of calcium sulphate ?
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Long ago, living things were divided into two main groups: _________
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Convert 23.92 mm to meter
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What is the invisible area of force extending out from the poles?Magnetic fieldSolenoidMagnetsCurrent flow
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I might quit brainly because people are just using me for my points.... could someone answer this for me?Why does every part of the body need food and oxygen delivered to it?a. The cells of the body need oxygen to make mitosis and food to make ribosomes.b. The cells of the body use the oxygen to release the energy from the food.c. The cells of the body need to make carbon dioxide out of food and oxygen.d. The cells of the body need food and oxygen for osmosis to happen.
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what are the two elements found in silicon dioxide
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