Crime scene investigators keep a wide variety of compounds on hand to help with identifying unknown substances they find in the course of their duties. One such investigator, while reorganizing their shelves, has mixed up several small vials and is unsure about the identity of a certain powder. Elemental analysis of the compound reveals that it is 63.5763.57% carbon, 6.0006.000% hydrogen, 9.2679.267% nitrogen, and 21.1721.17% oxygen by mass. Which of the compounds could the powder be?

Q: Antimony is alloyed with lead to increase the rigidity of components used in the construction of…

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Q: CaSO4⋅2 H2O (s) can be heated to completely drive off water to form CaSO4 (s). A 2.49 g sample of…

A: As there are three questions, we are solving the first question for you, rest to be solved please…

Q: The compound known as butylated hydroxytoluene, abbreviated as BHT, contains carbon, hydrogen, and…

A: Consider the given information is as follows; Mass of sample = 3.751 g Mass of CO2 = 11.24 g Mass of…

Q: Calculate the mass in grams of 1.23×10241.23×1024 molecules of methanol. The chemical formula for…

A: Given that, the molecules of methanol= 1.23 × 1024 Now, as per Avogadro’s law: 1 mol of methanol…

Q: A certain gasoline additive that boosts the octane rating of gasoline is made of the elements C, H,…

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Q: A student weighs an empty beaker at 81.702 g. A sample of MgSO4·??H2O is added to the beaker, and it…

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Q: To determine the amount of platinum in an alloy, a 8.565 g8.565 g sample of an alloy containing…

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Q: Write the balanced chemical equation for the reaction shown. Carbon is represented by a black…

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Q: A student weighs an empty beaker at 85.301 g. A sample of Na2SO4·??H2O is added to the beaker, and…

A: Mass of empty beaker = 85.301 g  Mass of beaker + hydrated salt = 86.607 g  Mass of beaker +…

Q: For the following reaction, 9.15 grams of nitrogen monoxide are allowed to react with 9.41 grams of…

A: Reaction involved : 2NO(g) + O2(g) -----> 2NO2(g) Moles of nitrogen monoxide (NO)  = given mass/…

Q: The density of water is 1.00 g/mL at 4 degrees Celsius. How many water molecules are present in…

A: First of all calculate the mass of water by using given volume and density of water. Then calculate…

Q: Ascorbic acid is one form of vitamin C and is known to contain only carbon, hydrogen, and oxygen.…

A: Given,  The mass percent of Carbon = 40.91%  Hydrogen = 4.578% and Oxygen = 54.50% The mass of the…

Q: Consider the reaction of solid P4 and chlorine gas to form gaseous phosphorus trichloride. a) Write…

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Q: A large electronics company is creating and testing SiC for use in new computer chips. A chemical…

A: Limiting reagentLimiting reagents are substances that are completely consumed in the completion of a…

Q: In the spring of 1984, concern arose over the presence of ethylene dibromide, or EDB, in grains and…

A: The mass and moles of EDB in one flour is calculated as,

Q: In a combustion analysis experiment, an unknown hydrocarbon produced 154.47861 g of carbon dioxide…

A: Empirical formula represents the smallest whole number ratio of the atoms present in the organic…

Q: 12.00 g of a potassium hydroxide, KOH solution is mixed with 40.00 g of lead (II) nitrate, Pb(NO3)2…

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Q: mercury salicylate is a common active ingredient in liniments such as ben gay . it is also known as…

A: n=mM Number of moles of carbon dioxide will be: nCO2 = 12.24 g18 g/mol=0.278 mol Similarly, number…

Q: A chemist is to be carrying out an experiment in which he reacts solid copper with a silver nitrate…

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Q: The reaction of 7.71 x 103 g of titanium (IV) chloride gas with 1.45 x 103 g of oxygen gas produces…

A: Titanium chloride reacts with oxygen to give titanium oxide and two moles of chlorine gas.

Q: 5.000 gram sample of hydrated beryllium carbonate, BeCO3·xH2O is heated according to the procedure…

A: To calculate the number of moles of H2O and BeCO3.

Q: 32.854 cm³ of solid magnesium reacts with 7.42760 x 1023 carbon dioxide gas molecules, to make solid…

A: Volume of Mg = 32.854 cm3  Number of molecules of CO2 = 7.42760 × 1023 molecule

Q: When a sample of solid potassium chlorate is heated strongly, a decomposition reaction occurs. Solid…

A: Mole is calculated by dividing the given mass with molecular mass. When a sample of solid potassium…

Q: Quartz, SiO2, contains 46.7% silicon. What mass of silicon is present in 370 g of quartz?

A: To solve this problem we have to calculate the mass of silicon present in quartz .

Q: In the above equation, silicon dioxide reacts with carbon upon heating to produce silicon carbide…

A: Given dats is  Mass of silicon dioxide= 44.0 g  Mass of carbon= 44.0 g  Yield of the reaction= 100%

Q: The Hall process for the production of aluminum involves the reaction of aluminum oxide with…

A: Answer:The limiting reagent is the reactant that exhuast first in the chemical reaction and decides…

Q: A candle flame produces easily seen specks of soot near the edges of the flame, especially when the…

A: Empirical formula: The simplest positive integer ratio of atoms present in a compound is known as…

Q: Upon reaction of 1.27 g of copper sulfate with excess zinc metal, 0.513 g copper metal was obtained…

A: …

Q: A grain of sand weighs 7.7 × 10−4 g. How many formula units of silicon dioxide, SiO2, are in one…

A: The mass of one formula unit of SiO2 = 60.08 g/mol

Q: What is the percent yield

A: Given CuSO4(aq)  +  Zn(s)   →  Cu(s)  +  ZnSO4(aq)  1.27 g of copper sulfate with excess zinc metal,…

Q: A sample containing only carbon,hydrogen,phosphorus and oxygen is subjected to elemental analysis.…

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Q: In a chemical reaction, sulfur goes through a combustion reaction and produces sulfur trioxide as a…

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Q: A 0.812 g sample of a compound containing carbon, hydrogen and oxygen was burned in air to produce…

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Q: empirical formula of bismuth chloride?

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Q: Maggie filtered out a sample of copper (II) chloride, CuCl2 from a local pond, and found its mass to…

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States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.