Questions in Chemistry


which resources are significantly polluted by heavy metals like mercury

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Which resources are significantly polluted by heavy metals like mercury? a. soil b. water c. neither A nor B d. both A and B
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what is the product of the hydrogenation of an alkene

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Draw the product of the hydrogenation of 2-butyne. draw all hydrogen atoms.
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how many moles are there in 24 grams of fef3

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How many moles are there in 24.0 grams of FeF3?
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select the atomic models that belong to the same element.

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Select the atomic models that belong to the same element.
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what is the percent by mass of oxygen in fe2o3

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What is the percent by mass of oxygen in Fe2O3 (formula mass = 160)?
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draw a second resonance form for the structure shown below.

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Draw a second resonance structure for the following ion (be sure to include the charges and all lone pairs)... + ..N=N=N <-------------->.. ..
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what is the molar solubility of pbbr2 in pure water

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The ksp of pbbr2 is 6.60×10−6 . What is the molar solubility of pbbr2 in pure water?
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predict whether the compounds are soluble or insoluble in water.

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Predict whether the compounds are soluble or insoluble in water. Soluble Insoluble
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which pure substance is composed of more than one element

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1) Which pure substance is composed of more than one element? A. carbonB. goldC. waterD. sodium​
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how many moles of no2 are present in 114.95 g

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The molar mass of NO2 is 46.01 g/mol. How many moles of NO2 are present in 114.95g?
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what makes balancing redox reactions different from balancing other reactions

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What makes balancing redox reactions different from balancing other reactions?
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which energy transformation takes place when using a power drill

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4. Which energy transformation takes place when using a power drill? A. mechanical to chemical В. electrical to mechanical с. chemical to electrical D heat to mechanical
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if fluorine 20 undergoes beta decay what will it become

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If fluorine 20 undergoes beta decay , what will it become ?
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if the nucleus was the size of a tennis ball

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If the nucleus was the size of a tennis ball the atom would be the size of....?
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draw the missing curved arrow notation for the mechanism below.

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Draw a mechanism for the reaction of the aldehyde with hydronium ion. In the first box, draw any necessary curved arrows. Show the products of the reaction in the second …
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what structures allow t cells to locate and destroy invaders

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What structures allow T cells to locate and destroy invaders? O A. Macrophages O B. Pathogens O C. Lymph O D. Antibodies
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the amount of substance in a certain volume is its

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The amount of one substance in a certain volume of another substance is called its ____________________.
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which of the following are correct for zero order reactions

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Which of the following are correct for zero-order reactions? A. A higher concentration of reactants will not increase the reaction rate. B. The units for the rate constant and the …
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which of the following elements has the greatest metallic character

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Which of the following Group 15 elements has the greatest metallic character? (1) nitrogen (3) antimony (2) phosphorus (4) bismuth
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dimensional analysis and the crash of flight 143 answer key

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Explain how using dimensional analysis could have prevented this crash
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(nh4)2s(aq)+srcl2(aq)→

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