Questions and Answers for Chemistry

Chemistry

What are some examples of compounds?

A chemical compound is a chemical substance that is made of two or more atoms of different elements that share a chemical bond. A chemical formula represents the ratio of atoms per element that...

Latest answer posted November 2, 2015 10:58 am UTC

3 educator answers

Chemistry

Combustion Of Benzene

C6H6 is the chemical formula of benzene. It is a molecule comsisting of 6 carbon atoms and 6 hydogen atoms. When benzene undergoes combustion in air, the carbon and hydrogen atoms combine with the...

Latest answer posted September 10, 2012 2:04 am UTC

1 educator answer

Chemistry

Is this compund molecular or ionic? (NH4)2SO4

Covalent compounds are formed between nonmetals. Examples of nonmetals H , O , N , C , S , P , F , Cl , Br , I. Examples of covalent compounds: - CH2O, H2O etc., Ionic compound is formed between a...

Latest answer posted September 5, 2012 5:41 am UTC

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Chemistry

What are some examples of homogeneous mixtures and heterogeneous mixtures?

A homogeneous mixture and a heterogeneous mixture are first and foremost both mixtures. That means no chemical bonding has occurred between the substances within the mixtures. They can be...

Latest answer posted October 12, 2015 1:32 pm UTC

4 educator answers

Chemistry

What is the formula for converting grams to atoms or atoms to grams? How many atoms are in 878g of fluorine?

You cannot directly convert grams to atoms. First you must covert your grams to moles, then you can take the moles and covert to atoms. If you take your 878 grams of fluorine and then look at the...

Latest answer posted February 7, 2009 1:47 pm UTC

1 educator answer

Chemistry

Write the symbol for a cation and an anion that are isoelectronic with Krypton. Is it possible for a cation to be...

Krypton has an atomic number 36, so it has 36 electrons. Bromine with an atomic number of 35 acquires one electron to attain 36 electrons. This makes it isoelectronic with krypton. The anion of...

Latest answer posted February 8, 2011 4:43 am UTC

1 educator answer

Chemistry

Methanamide, HCONH2, is a planar molecule. All the bond angles in the molecule are approximately 120 degree.The C-N...

Methanamide (HCONH2) is also called formamide. The standard Lewis structure notation involves a single bond between the hydrogen and the carbon, a double bond between the carbon and the oxygen, a...

Latest answer posted November 18, 2012 5:00 pm UTC

1 educator answer

Chemistry

What are some common compounds we come across in our daily lives, besides water?

There are more than 1000 compounds we use in our daily lives few are listed below.Sodium chloride (NaCl) known as table salt used for cooking Sodium hydrogen carbonate (NaHCO3) known as baking...

Latest answer posted August 23, 2012 9:54 pm UTC

1 educator answer

Chemistry

Suppose you want to make 100 grams of water.  How much hydrogen and Oxygen would you need to make 100 grams of water...

The chemical formula of water is H2O. One molecule of water has 2 atoms of hydrogen and one atom of oxygen. 1 mole of water requires 1 mole of hydrogen (H2) and 0.5 moles of oxygen (O2). The molar...

Latest answer posted March 4, 2012 11:24 am UTC

1 educator answer

Chemistry

How could I separate a mixture of salt and sugar?

Separating a mixture of salt and sugar is actually quite easy. Athough sugar is soluble in any type of alcohol, salt on the other hand is not. If you want to separate the two, first mix both salt...

Latest answer posted January 22, 2014 6:09 pm UTC

3 educator answers

Chemistry

What happens to the volume of a sample of gas if the pressure is tripled and the temperature in K is doubled?

The volume of a given amount of gas is related to the temperature and pressure by the Ideal Gas Law by P*V=n*R*T or V = k*T/P The volume is directly proportional to the temperature and inversely...

Latest answer posted November 9, 2011 10:57 am UTC

1 educator answer

Chemistry

Explain why the first ionization energy of potassium is much larger than the first ionization energy of calcium.

The first ionization energy of potassium is 419 kJ/mol while calcium's is 376 kJ/mol. Note that the first ionization energy is the amount of energy needed to remove an outer electron from the...

Latest answer posted April 10, 2012 1:53 pm UTC

1 educator answer

Chemistry

Aluminum reacts with oxygen in the following chemical reaction:  Al + O2 → Al2O3. How many moles of Al2O3 are formed...

The chemical equation when aluminum reacts with oxygen is: 4Al + 3O2 --> 2Al2O3 3 moles of O2 react with 4 moles of Al to give 2 moles of Al2O3. The ratio of the number of moles of aluminum to...

Latest answer posted June 21, 2012 12:56 pm UTC

2 educator answers

Chemistry

Is CO2 + H2O ->H2CO3 an oxidation-reduction reaction?

The reaction between carbon dioxide and water to form hydrogen carbonate is an example of a bond-reorganization reaction. As one of the reactants is water it is also referred to as a hydration...

Latest answer posted September 23, 2012 3:35 am UTC

1 educator answer

Chemistry

Why do the elements of the same group have similar properties ?

We should be careful when defining "properties" - chemical properties are probably the ones that an instructor would be taking into consideration. By contrast, elements of the same group have very...

Latest answer posted July 22, 2015 2:17 am UTC

1 educator answer

Chemistry

How many moles of H2SO4 will react with 18 mol of Al in a chemical reaction involving the two.

Aluminum reacts with `H_2SO_4` to form `Al_2(SO_4)_3` . The equation of the chemical reaction is: `2Al + 3H_2SO_4 -> Al_2(SO_4)_3 + 3H_2 ` 2 moles of aluminum react with 3 moles of hydrogen...

Latest answer posted June 21, 2012 4:50 pm UTC

2 educator answers

Chemistry

Convert the following word equation into a balanced symbol equation: Copper(2) carbonate + hydrochloric acid--->...

You are only allowed to ask one question at a time so I edited down your question accordingly. We need to convert the following to a balanced chemical equation: copper (2) carbonate plus...

Latest answer posted January 13, 2013 3:17 am UTC

1 educator answer

Chemistry

What is the pH of a 0.1 M solution of acetic acid?

We can calculate the concentration of H+ ions in a 0.1 M solution of acetic acid by using the pKa or ionization constant which for any compound is the negative logarithm of the equilibrium...

Latest answer posted August 31, 2011 1:26 am UTC

1 educator answer

Chemistry

Is Sucrose C^12H^22O^11 (s) (table sugar) salt or base or acid or neither? which is it?

The chemical name for table sugar is sucrose (C12H22O11). To classify this compound first we have to know what happens when this compound is in the solution. If it is an acid, it will release...

Latest answer posted October 19, 2012 11:37 am UTC

1 educator answer

Chemistry

What tools and technologies are used by Chemists?

Chemists use many different tools and technologies to perform their work. The study of chemicals requires very accurate equipment that can measure precise weights, analyze reactions and color...

Latest answer posted July 23, 2012 9:45 pm UTC

1 educator answer

Chemistry

How many liters of 4 M solution can be made using 100 grams of lithium bromide?

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...

Latest answer posted April 2, 2011 9:16 pm UTC

1 educator answer

Chemistry

What are three different ways to classify elements?

Classifying elements is necessary in order to determine their nature and the possible reactions. We can classify them according to phases: Solid, liquid and gas. Most elements in the periodic table...

Latest answer posted March 12, 2013 4:56 pm UTC

1 educator answer

Chemistry

What's the Noble Gas & Electron configuration of the element Palladium? I'm doing a powerpoint on this element. I...

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...

Latest answer posted November 22, 2010 4:30 am UTC

1 educator answer

Chemistry

How many grams of ammonium sulfate are needed to make a 0.25 L solution at a concentration of 6 M?

The concentration of a solution can be expressed in many way, one of them is molarity or the molar concentration. If a solution has a molarity of one, it has one mole of the solute in every liter...

Latest answer posted April 1, 2011 11:53 am UTC

1 educator answer

Chemistry

What is the purpose of Chromatography? objective,what is the purpose doing lab experiment for Chromatography?

Chromatography is a very common lab technique that is used to separate different components of a complex mixture. It takes the advantage of differential solubility of different components of a...

Latest answer posted September 9, 2012 7:24 pm UTC

1 educator answer

Chemistry

chemical equation when copper2 sulfate add with ammonium hydroxide?  

The reaction of copper (II) sulfate CuSO4 and ammonium hydroxide NH4OH will yield Copper (II) hydroxide Cu(OH)2 and ammonium sulfate (NH4)2SO4. The chemical equation for this reaction would be...

Latest answer posted October 30, 2012 5:18 pm UTC

1 educator answer

Chemistry

What molecular compound is formed by Phosphorus and Fluorine?

Phosphorus and fluorine together form phosphorus trifluoride, or PF3. PF3 has trigonal bipyramidal molecular geometry and can be polar or nonpolar depending on the binding locations of the flourine...

Latest answer posted June 5, 2009 5:52 am UTC

1 educator answer

Chemistry

Given 4K(s) + O2(g) ---> 2K2O(s), how many grams of K2O(s) can be produced if 3.91 grams of K(s) are allowed to...

The equation of the chemical reaction between potassium (K) and oxygen (O2) is: 4K + O2 --> 2K2O From the equation it is seen that 4 moles of potassium react with with one mole of oxygen gas...

Latest answer posted August 15, 2012 5:38 am UTC

1 educator answer

Chemistry

Why can copper sulfate dissolve in water easily?

Copper Sulfate can dissolve in water because water is a polar solvent. A polar solvent is one where the molecules that make up the solvent have a charge that is unequally distributed in the...

Latest answer posted June 17, 2011 2:57 am UTC

1 educator answer

Chemistry

Why is nitrogen monoxide, NO, formed in a car engine? Explain briefly why the presence of nitrogen oxides in air is...

Nitrogen oxides, including NO and NO2, are produced as a result of combustion in a car engine. Pure combustion takes hydrocarbons (gasoline) and pure oxygen (O2) and produces CO2 and H2O. But...

Latest answer posted November 18, 2012 5:23 pm UTC

1 educator answer

Chemistry

What holds atoms together in ionic bonds?

In ionic bonds one atom is positively charged (the atom that gives its electrons), and the other atom is negatively charged (the atom that receives the electrons); therefore, it is the opposite...

Latest answer posted June 2, 2013 8:16 pm UTC

1 educator answer

Chemistry

Calculate the number of grams of sodium chloride that can be produced by the reaction of 22.4mL of 2.00M hydrochloric...

The reaction between sadium chloride and the hydrochloric acid can be illustrated by, NaOH + HCl --> NaCl + H2O so here 1 mole of NaOH reacts with 1 mole of HCl. Hence it is required to convert...

Latest answer posted May 2, 2012 10:39 am UTC

2 educator answers

Chemistry

How many molecules of fluorine are in 15.6 grams of MgF2?  

You can set up stoichiemetry using the following equation: (15.6 g MgF2) x (38g F / 62g MgF2) x (6.022x10^23 / 19gF) = 3.03 x 10^23 molecules of F or 1.52 x 10^23 molecules of F2

Latest answer posted December 31, 2011 1:44 am UTC

2 educator answers

Chemistry

What is the mass/volume of a 3.00 M solution of NaCl?

A 3.00 M solution of sodium chloride (NaCl) has 3 moles of NaCl in every liter of the solution. To find the mass/volume of the 3.00M solution, we must determine the mass of a single mole of NaCl...

Latest answer posted December 1, 2012 5:27 am UTC

1 educator answer

Chemistry

Vanadium (V) oxide is used as catalyst in the reaction below.2 SO2 (g) + O2 (g) --->  2 SO3 (g) Explain how...

Vanadium (V) oxide (V2O5) is used as a catalyst for the oxidation of sulfur dioxide to sulfur trioxide. It is able to catalyze this reaction because it releases oxygen (O2) when heated up. The...

Latest answer posted November 19, 2012 5:41 pm UTC

1 educator answer

Chemistry

Determine the molecular formula of the compound with an empirical formula of CH and a formula mass of 78.110 amu.

The empirical formula of the compound that we have to determine is CH. The molecular mass of the compound is given by 78.110 amu. The atomic mass unit or amu is defined as 1/12 the mass of the...

Latest answer posted March 18, 2011 4:21 pm UTC

1 educator answer

Chemistry

When zinc sulfide is heated in the presence of oxygen the following reaction occurs:  ZnS + O2 → ZnO + SO2. If 1.72...

The limiting reactant in a chemical equation is the reactant that is completely consumed when the chemical reaction takes place. As a result the reactant determines for how long the reaction takes...

Latest answer posted June 21, 2012 1:13 pm UTC

1 educator answer

Chemistry

Calculate the concentration of each ion in the following solutions:0.15 M (NH4)2SO4(aq)? when 30.0 grams of CaBr2(s)...

The molar concentration of the ions in the form moles/liter is provided for the given solutions. A solution of ammonium sulfate (NH4)2SO4 with a concentration 0.15 M has a NH4 ion concentration of...

Latest answer posted August 15, 2012 5:57 am UTC

1 educator answer

Chemistry

If you know only the number of neutrons can you determine what the element is?

It is not possible to accurately identify an element given only the number of neutrons. All atoms are made of three particles: electrons, protons and neutrons. The number of electrons is equal to...

Latest answer posted December 13, 2011 8:57 pm UTC

1 educator answer

Chemistry

Is Sodium bicarbonate NaHCO^3 (aq) ionic or molecular? which is it?

Hello! Aqueous solutions is a kind of solution where in the solvent is water. It is commonly labelled as (aq) after the compound. For example HCl (aq). This also means that the solutes is...

Latest answer posted October 8, 2012 3:45 pm UTC

1 educator answer

Chemistry

What is the concentration of a 450 mL solution that contains 200 grams of iron (II) chloride?

The concentration of a solution can be expressed in terms of its molarity (M). A solution with a molarity of one has a concentration of one mole of the solute in every one liter of the solution....

Latest answer posted April 2, 2011 9:05 pm UTC

1 educator answer

Chemistry

Name the following compounds: AgNO3, K2S, BaS, Agl & Kl

The compounds you would like to know the names of are AgNO3, K2S, BaS, Agl and Kl. Here keep in mind that Ag is silver, K is potassium, B is barium and K is potassium. The cation NO3 is called...

Latest answer posted June 3, 2011 3:58 pm UTC

1 educator answer

Chemistry

How is fission different from alpha or beta decay?

Technically speaking, alpha and beta decay are both types of nuclear fission. Fission is the breaking down of an atom's nucleus into smaller parts. Specifically, alpha decay is the breaking down...

Latest answer posted October 19, 2012 1:30 am UTC

1 educator answer

Chemistry

How are atoms of different elements different?

Atoms are made up of three types of particles; these are electron, proton and neutron. The number of electrons and protons in any atom is the same as these particles have an electrical charge of...

Latest answer posted September 8, 2012 5:48 am UTC

1 educator answer

Chemistry

What is the chemical formula for Iron II sulfite?

Sulfites are chemical compounds that have the sulfite ion which is SO3-- with a valence of 2-. Iron can form chemicals in which it is capable of existing in many oxidation states ranging from -2 to...

Latest answer posted September 5, 2012 5:07 am UTC

1 educator answer

Chemistry

Every chemical reaction has a DH value. What does the symbol "DH" mean?

Every chemical reaction is either endothermic (heat absorbing) or exothermic (heat producing.) Capital H in chemistry (not to be confused with the element Hydrogen!!) will be found with reaction...

Latest answer posted May 19, 2011 7:16 am UTC

1 educator answer

Chemistry

What is the equation for the prepartation of bleach?

Bleach is Sodium Hypochlorite (NaOCl). It is made industrially by the Hooker Process where Chlorine Gas is reacted with Sodium Hydroxide in a cold electrolytic cell following the equation: Cl2...

Latest answer posted December 26, 2009 12:32 am UTC

1 educator answer

Chemistry

Which is more stable: the Sodium ion or the Sodium atom?

An exothermic reaction takes place between any two atoms if the resulting molecule has a lower enthalpy than the sum of the enthalpy of the two atoms. The atom of sodium has one electron in its...

Latest answer posted February 21, 2012 12:10 pm UTC

1 educator answer

Chemistry

What happens to pressure as volume increases?

Boyle's law states that for a fixed amount of gas in an enclosed system at constant temperature, pressure and volume are inversely proportional. In other words, when one of the two variables is...

Latest answer posted October 11, 2012 5:10 pm UTC

1 educator answer

Chemistry

What is the equation of the exothermic reaction in a blast furnace?

In a blast furnace, which is generally used to obtain pure iron from its ore, the following reactions take place. C + O2 --> CO2 + Heat C + CO2 --> 2CO Fe2O3 + 3CO --> 2Fe + 3CO2 Fe2O3 +...

Latest answer posted January 5, 2011 10:05 pm UTC

2 educator answers

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