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Chemistry
In their natural state, all elements are neutrally charged. In other words, in their natural state, elements contain the same amount of protons as electrons, and hence their net charge is zero or...
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Chemistry
There are a lot of precise details on how to use, handle, and clean glassware in clinical laboratroies. They must be checked regulary for cracks and scratches. There are specific types of...
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Chemistry
Your phrasing is not correct. You are really asking how to write chemical formulas, not make them. Here's a website to help: http://www.fordhamprep.org/gcurran/sho/sho/lessons/lesson53.htm
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Chemistry
Most likely it is Sulfur The Properties of sulfur are: Sulfur is not water soluble but is soluble in carbon disulphide. Sulfur is a yellow powdery substance. Sulfur will in the presence of oxygen...
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Chemistry
Each electron in an atom is uniquely defined by three quantum numbers that indicate the electron's energy, the electron's angular momentum and the direction of the angular momentum. Two electrons...
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Chemistry
Groups of atoms that are involved in chemical reactions that the molecules they are found in undergo are called functional groups. There are many functional groups found in organic compounds many...
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Chemistry
When silicon is added to a sodium hydroxide solution the reaction that takes place is : Si + 2NaOH + H2O --> Na2SiO3 + 2H2 One mole of silicon reacts with 2 moles of sodium hydroxide to give...
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Chemistry
To solve this we need to use the ideal gas law equation PV=nRT. We are asked to calculate the volume at STP which means standard temperature and pressure. That means 1 atm of pressure and 25 *C....
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Chemistry
First we need to convert the amounts of NaHCO3 and acetic acid into moles and then compare the two. 5 g NaHCO3 * (mole/84 g) = 0.06 moles NaHCO3 90 mL AcOH * (1.05 g/mL) * (mole/60.05 g) = 1.57...
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Chemistry
The density of a substance is the mass per unit volume, usually expressed as grams per milliliter. We know what the mass of the solid is (123.4 grams), so we need to figure out what its volume is....
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Chemistry
The intermolecular forces between water molecules are the hydrogen bond. The hydrogen bond is a force of attraction between hydrogen atoms that are covalently bonded to atoms of electronegative...
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Chemistry
Enzymes are biological catalysts, and they are very common in nature. In fact, all living cells need enzymes to continue their function. Without enzymes, chemical reaction in cells would not be...
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Chemistry
Gasoline and fat are chemically similar in that they are essentially hydrocarbons, or chemical compounds that contain only carbon and hydrogen covlently bonded together. "Pure" gasoline is...
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Chemistry
The reaction for which we have to find the enthalpy change is: C2H3OH(l)-->CH3OCH3(l) The Enthalpy of formation of C2H3OH(l) is given as DHo=-1234.7 kJ and the enthalpy of formation of...
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Chemistry
The Law of Definite Proportions agrees with Dalton's Atomic Theory so the answer is "c". The law of definite proportions, also known as Proust's Law, states that a chemical compound contains the...
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Chemistry
Any cake could be considered a compound, which is defined as something composed of two or more separate elements. Baking is a science, requiring precise measurements of the ingredients listed in a...
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Chemistry
Silicon Carbide (industrially known as Carborundum) is extremely rare in nature, but has been produced in quantity since the 1890's. Its hardness has found many uses in industry; diamond jewelry...
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Chemistry
Atomic theory states that all substances are comprised of atoms. Something that has all the same atoms is an element; something with a mixture of different atoms is a compound. Each of these...
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Chemistry
First we need to balance the given chemical reaction 4Al + 3O2 ----> 2Al2O3. Second divide the given moles with stoichiometric coefficient form the reaction. Given 0.32 moles of Al. 0.26 moles...
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Chemistry
To determine the value of the rate constant, we can use the Arrhenius equation. We can plug in the given values for T1 and T2 (must be in Kelvin), the activation energy (must be in J/mol), R...
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Chemistry
Batteries work by converting stored chemical energy into electrical energy. Both automobile batteries as well as 9-V alkaline batteries use the chemical energy stored in different chemical...
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Chemistry
Alchemy is a bit hard to define in a single sentence due to the fact that different groups at different times considered alchemy to be about different things. In the simplest sense, alchemy was...
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Chemistry
An oxidizing agent is needed for the combustion of the fuel in a rocket. The combustion of the fuel generates a lot of energy which pushes out the products of combustion with a very high momentum...
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Chemistry
In order to answer this question, one must have an understanding of the types of forces that exist to hold atoms/ions in molecules. There are four principal chemical bonds, and they are: ionic,...
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Chemistry
The limiting reagent is the reagent in a multicomponent reaction that will be exhausted as the reaction proceeds to completion. In other words, if a chemical reaction has multiple reagents, the...
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Chemistry
The equilibrium expression for any chemical reaction can be determined if the phase of each substance that constitutes the chemical equation is known and the equation is balanced with the same...
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Chemistry
Fe2(SO4)3 + 12 KSCN → 2 K3Fe(SCN)6 + 3 K2SO4 H2SO4 is mentioned in the reactant side just to mention that this reaction takes place in acidic medium. This is the complete balanced chemical...
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Chemistry
Catalysts are substances added to reactions that change the rate of the reaction. They can either increase the rate of the reaction in the case of positive catalysts or slow down the rate of the...
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Chemistry
Both sodium hydroxide and lithium hydroxide are strong bases and are widely used in many chemical reactions. While sodium hydroxide is cheaper to produce that lithium hydroxide, the chemical...
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Chemistry
The sample of the compound containing Cl- has 0.175 g of Cl- ions. It is dissolved in 50 mL of deionized water and titrated with AgNO3. The volume of the final solution is 75 mL. This gives the...
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Chemistry
The equation of the chemical reaction between magnesium and hydrochloric acid is: Mg(s) + 2HCl (aq) ---> MgCl2 (aq) + H2 From the equation it is seen that 2 moles of hydrochloric acid are needed...
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Chemistry
A 4 M solution of lithium bromide has to be made with 100 grams of lithium bromide. A solution with a concentration of 1 M has one mole of the solute dissolved in one liter of the solution. The...
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Chemistry
In the Haber–Bosch process, the gases hydrogen H2 and nitrogen N2 are passed at high temperatures, in the range of 400-450 degrees Celsius, and at high pressures, close to 200 atmospheres, over a...
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Chemistry
For first order processes, we have two equations that we can use. The first is the integrated rate law ln([At]/[Ao] = - kt Where At is the concentration at time t, Ao is the initial concentration,...
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Chemistry
Atoms of elements combine with each other to form molecules so that the number of electrons in the outermost shell of each atom is equal to that of the nearest noble gas. This can be 2, 8, 18......
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Chemistry
A compound is made of calcium and chlorine. A 2.5 g sample contains 0.9 g of calcium and 1.6 g of chlorine. The percentage by molar mass of calcium in the compound is (0.9/40)/2.5 = 0.009 and the...
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Chemistry
To determine the calorimeter constant, a student adds 50.0 ml H2O at 48.5 C to 50.0 ml H2O at 23.2 C in a calorimeter. The temperature of the mixture that is obtained is 35.4 C. The density of...
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Chemistry
If we are looking at a galvanic cell, then it be a spontaneous process so we need to determine which is the oxidation reaction and which one is the reduction reaction. The half-reaction with the...
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Chemistry
Since we have the grams of the sample of gas, we need to calculate the number of moles of the gas in order to figure out the molecular weight. We can do this using the gas law equation PV=nRT. P=2...
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Chemistry
The chemicals you have provided are examples of an acid reacting with a base. An acid AH reacts with a base BOH to give a salt AB and water if there is an excess of OH- and H+ ions which can react...
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Chemistry
The chemical reaction between N2H4 and H2O2 produces nitrogen gas N2 and water H2O. The balanced chemical equation of the reaction is: N2H4 + 2 H2O2 --> N2 + 4 H2O One reaction involves one...
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Chemistry
Option (C) is the correct answer to this question. Explanations as to why the other options are not the correct responses are found below. Option (A) is not the correct answer because...
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Chemistry
The compounds for which the chemical formula is required are lead nitrate, silver bromide, barium chloride, potassium hydride and potassium iodide. In the chemical formula of compounds, elements...
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Chemistry
The net ionic equation shows the ions that have participated in the reaction. All other ions are spectator ions. If an ion starts out aqueous, and remains aqueous, it hasn't done anything. It is a...
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Chemistry
Palladium has an atomic number of 46 and has 46 electrons orbiting the nucleus. The electronic configuration of Palladium is 1s2, 2s2, 2p6, 3s2, 3p6, 3d10, 4s2, 4p6, 4d10. The noble gas which is...
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Chemistry
To know the difference in the buffer capacity of the two liquids, we have to know their pH's. Distilled water: pH = 7.00 Acetic acid - acetate buffer: We shall use the Henderson-Hasselbalch...
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Chemistry
The answer's 6. O2 (the 2 is usually written smaller and slightly below the line of the O) represent two oxygen atoms. And the C in front is a single atom of carbon. This is because a number AFTER...
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Chemistry
Kinetic energy refers to the energy of motion that matter may possess. On the atomic scale, it refers to the motion of all the atoms in a sample of matter. The atoms may be vibrating in place,...
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Chemistry
Chemical Equilibrium is a term applied to reversible chemical reactions. It is the point at which the rate of the forward reaction is equal to the rate of the reverse reaction. When equilibrium...
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Chemistry
The most obvious thing that will happen is that there will be a change of state, from liquid to solid at the melting/freezing point (they are really the same thing--the temperature at which this...