Chemistry Questions and Answers

Chemistry

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

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

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)

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Chemistry

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

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

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

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

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

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

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

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

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

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

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

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)

2 educator answers

Chemistry

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

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

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

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

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

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

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

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

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

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

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

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

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

Chemistry

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

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

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

To an extent, the answer to this question does depend on a person's view of God and his creation. I'll answer from a traditional Judeo-Christian worldview. Christians believe that God created...

Latest answer posted April 25, 2019, 12:37 pm (UTC)

1 educator answer

Chemistry

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

The acid dissociation constant is a value defined for every acid HA and denoted by Ka = [H+][A-]/[HA] The acid dissociation constant of oxalic acid is 5.60×10^-2 and 5.42×10^-5. There are two...

Latest answer posted December 18, 2011, 2:58 pm (UTC)

1 educator answer

Chemistry

Ionic compounds are formed when the interaction between atoms results in a transfer of electrons, resulting in the atoms possessing a positive and negative charge, which then attracts the component...

Latest answer posted June 8, 2011, 4:26 am (UTC)

1 educator answer

Chemistry

An Na+ ion is a sodium atom that has lost one electron as that makes the number of electrons in the atom equal to that of the nearest Nobel gas Neon which has 10 electrons. This completely fills...

Latest answer posted November 26, 2011, 12:49 pm (UTC)

1 educator answer

Chemistry

DDT which has a molecular formula of C14H9Cl5 has 14 atoms of carbon, 9 atoms of hydrogen and 5 atoms of chlorine. The atomic mass of carbon, hydrogen and chlorine is 12, 1 and 35 respectively. The...

Latest answer posted July 12, 2012, 7:49 pm (UTC)

1 educator answer

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...

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

1 educator answer

Chemistry

Finding the limiting reactant Given NO2(g) + O2(g) → NO(g) + O3(g) 5.20 g of nitrogen dioxide 3.90 g of oxygen. First step balance the given chemical reaction NO2(g) + O2(g) → 2NO(g) + O3(g) This...

Latest answer posted July 3, 2012, 10:45 pm (UTC)

2 educator answers

Chemistry

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

Metallic copper reacts with a solution of silver nitrate to form a solution of copper(II) nitrate and the silver is precipitated. The equation for this reaction can be written as Cu + AgNO3 --->...

Latest answer posted May 8, 2011, 1:26 pm (UTC)

1 educator answer

Chemistry

Carbon monoxide reacts with oxygen gas to produce carbon dioxide according to the following equation: `2 CO + O_2 -> 2 CO_2` At room temperature this reaction must be catalyzed. Carbon monoxide...

Latest answer posted March 17, 2016, 1:34 am (UTC)

1 educator answer

Chemistry

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

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

K2CrO4 + CuSO4 = CuCrO4 + K2SO4 The colour is dark brown.

Latest answer posted July 11, 2012, 9:28 pm (UTC)

1 educator answer

Chemistry

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

If you're trying to find a way to remember how to tell compounds from mixtures, just remember that compounds don't have variable composition and mixtures do. For example, water is always composed...

Latest answer posted October 22, 2015, 12:44 am (UTC)

2 educator answers

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...

Latest answer posted November 14, 2009, 12:40 pm (UTC)

1 educator answer

Chemistry

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

Citric acid has 37.51% carbon, 4.2% hydrogen and 58.29% oxygen by mass. The molar mass of carbon is 12 g/mole. The molar mas of hydrogen in 1 g/mole and the molar mass of oxygen is 16 g/mole....

Latest answer posted February 12, 2012, 1:10 am (UTC)

1 educator answer

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