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shtirl [24]
4 years ago
5

Which equation is a decomposition reaction?

Chemistry
2 answers:
Fiesta28 [93]4 years ago
8 0

Answer: Li_2CO_3\rightarrow Li_2O+CO_2

Explanation:

Decomposition is a type of chemical reaction in which one reactant gives two or more than two products.

A\rightarrow B+C

1. Li_2CO_3\rightarrow Li_2O+CO_2 is an example of decomposition.

2. Zn+HCl\rightarrow ZnCl_2+H_2 is an example of single replacement reaction in which more reactive element displaces the less reactive element from its salt solution.

3. Na_2O+CO_2\rightarrow Na_2CO_3 is an example of synthesis reaction in which two reactants are combining to form one product.

4. C_6H_{12}O_6+O_2 \rightarrow CO_2+H_2O is an example of combustion in which fuel is reacted with oxygen to form carbon dioxide and water.

mestny [16]4 years ago
4 0

Decomposition means a reactant is broken down. Therefore, the Li2CO3 equation is the correct one.

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State the assumptions that the kinetic-molecular theory makes about the characteristics of gas particles
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The kinetic-molecular theory explains the properties of the gases in terms of energy, size and motion of their particles.


The assumptions that the kinetic-moletuclar theory makes about the characteristics of gas particles are:


1. Gases are constituted by a large amount of particles (atoms or molecules) symilar to solid spherical sphers, in constant and random motion.


2. Gas particles move in straight line until collide with another particle or the walls of the vessel.


3. Gas particles are so small compared to the distances that separate them, that the volume of the gas is considered empty space: the volume of the particles is neglected.


4. Beside the already mentioned collisions with the walls of the vessels or between the particles, there is no interaction (attractive or repulsive forces) acting on the gas particles.

 

5. The collisions between gas particles or with the walls of the vessel are elastic: there is not loss of energy.


6. The average kinetic energy of the particles in a gas depends only on the absolute temperature of the gas: at a given temperatue every gas have the same average kinetic energy.


That collection of assumptions are used to explain such things as: the relation  of pressure withthe  number of particles, the relation of pressure and temperature, the relation of pressure and volume, the relation of volume and temperature, Avogadro's hypothesis (relation of volume and number of particles), Dalton's Law of partial pressures, and both effusion and difusion.

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3 years ago
Why are unbalanced equations NOT useful in<br> chemistry?
Nimfa-mama [501]

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3 years ago
A solution is made from ethanol, C2H5OH and water is 0.75 m. How many grams of ethanol are contained per 250. g of water?
kumpel [21]

Answer:

m_{solute}=8.6g

Explanation:

Hello,

In this case, the unit of concentration is molality which is defined by:

m=\frac{n_{solute}}{m_{solvent}}

Whereas the mass of the solvent is measured in kilograms. In such a way, with the given data, we first compute the kilograms of water:

m_{solvent}=250g*\frac{1kg}{1000g} =0.25kg

Then, we solve for the moles of the solute:

n_{solute}=0.75\frac{mol}{kg}*0.25kg =0.19mol

Finally since the molar mass of ethanol is 46 g/mol, we compute the grams for the given solution:

m_{solute}=0.19*\frac{46g}{1mol} \\\\m_{solute}=8.6g

Best regards.

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