Chemical Equations

When sodium carbonate reacts with calcium chloride, it forms calcium carbonate and sodium chloride. This is a double displacement reaction where the cations and anions of the two compounds switch partners.

A pair of half-reactions with reduction potentials that differ in sign will result in a negative total reduction potential. For example, a half-reaction with a reduction potential of +0.8 V paired with a half-reaction with a reduction potential of -0.7 V would give a negative total reduction potential (+0.8 V - (-0.7 V) = +1.5 V).

When manganese dioxide is heated with aluminium powder, the following reaction takes place:

These displacement reactions are highly exothermic. The amount of heat evolved is so large that the metals are produced in the molten state.

On the other hand when manganese is heated with aluminum oxide no reaction takes place as aluminum is more reactive than manganese and is placed higher in the activity series.

Copper is obtained from its sulfide ore by smelting, where the copper sulfide is heated in the presence of oxygen, producing copper metal and sulfur dioxide gas. The balanced chemical equation for the reaction is: 2Cu2S + 3O2 -> 2Cu + 2SO2

The overall chemical equation for photosynthesis is: 6CO2 + 6H2O + light energy → C6H12O6 + 6O2 This equation represents the conversion of carbon dioxide and water into glucose and oxygen using sunlight as the energy source, carried out by plants, algae, and some bacteria.

Changing subscripts means adjusting the number of atoms of each element in a chemical compound to ensure that both sides of the equation have the same number of atoms for each element. This step is necessary to balance the equation and satisfy the law of conservation of mass..ToDecimalDigits

There is no specific meaning for this. It would normally be used to draw attention to particular parts of the system. The author should explain what it's being used for. One example might be 'Is the substance in the red box an oxidising agent, reducing agent or neither?'

The coefficients in a balanced chemical equation give information about the relative numbers of moles of reactants and products involved in a chemical reaction. The coefficients represent the ratio of moles of each substance involved in the reaction.

Mg (magnesium) and O2 are elements.

2 glycerol + 6 Na ----> 3H2(g) + 2 sodium glycerate (using warm glycerine) and there is ignition

2 Benzyl alcohol + 2 Na ---> H2(g) + 2 sodium benzoate

The balanced chemical equation for magnesium strip reacting with KCl is:

2Mg(s) + 2KCl(aq) → 2K(s) + MgCl2(aq)

Using the stoichiometry of the reaction, the molar ratio of C8H18 to CO2 is 2:16. Therefore, if 4.000 moles of C8H18 are consumed, 16/2 * 4.000 moles of CO2 will be produced. This results in 32.000 moles of CO2, which can be converted to grams using the molar mass of CO2 to get the theoretical yield in grams.

Pb (plumbum) is the chemical symbol for the soft heavy metal, lead.

An example of a chemical equation where both the reactant and product have an equal number of atoms of a given element is the reaction of hydrogen gas (H2) with oxygen gas (O2) to form water (H2O). In this reaction, two molecules of hydrogen gas combine with one molecule of oxygen gas to produce two molecules of water.

9.675 g

Since oxygen has an average atomic weight of 15.999 g/mol that would make it 0.21 moles of oxygen.

Ethanol has one atom of oxygen per molecule so that means 0.21 moles of ethanol.

Since ethanol has a molecular weight of 46.07 g/mole, 0.21 moles of ethanol would have a mass of 9.675 g.

The law of conservation of mass states that matter cannot be created or destroyed, this means that the products (left side) and reactants (right side) must have the same amount of all the elements, no new ones can form or be lost.

Ex. looking at the equation

H2 + N2 --> NH3

there are two hydrogens on the left side and three on the right side, while there are two nitrogens on the left side and only one on the right side

We must therefore "balance" the equation by adding the proper coeffecients in front.

We end up with:

3H2 + N2 --> 2NH3

we have the same number of each element on either side

The balanced chemical equation for the reaction between sodium hydroxide (NaOH) and aluminum sulfate (Al2(SO4)3) is:

6 NaOH + Al2(SO4)3 -> 3 Na2SO4 + 2 Al(OH)3

This reaction forms sodium sulfate and aluminum hydroxide.

Yes, a chemical equation shows the number of atoms of each element involved in a chemical reaction, including those gained, lost, or rearranged. The Law of Conservation of Mass states that mass is conserved in a chemical reaction, so the total number of atoms before and after the reaction must be the same.

Fe(NO3)2 + (NH4)2CO3 = FeCO3 + 2 NH4NO3

That depends on what chemicals were mixed in order to produce the hydrogen gas. For example, if it was the metal magnesium (Mg), and the acid hydrochloric acid (HCl), then the equation would be Mg(s) + 2HCl(aq) -- > MgCl2(aq) + H2(g). Please note that the 2 after MgCl is supposed to be a subscript, as is the 2 after hydrogen. We are having difficulties with the subscripts and superscripts right now.

The reaction is:

2 H2O2 -------------2 H2O + O2

The hydrogen peroxide is the reactant; water and oxygen are the products.