What is decomposition rate? What does the decomposition of numbers mean?

Decomposition percentage = (mass of decomposed substance Total mass of the substance before decomposition) x 100%.

The decomposition rate is generally relative to the solid reactants, the total mass of a substance is m, if it is completely reacted, its decomposition rate is m m 100 = 100, if the mass of this substance is m left, then its decomposition rate is (m-m) m 100, the decomposition rate reflects the degree to which the substance participates in the reaction.

For example, a student takes a certain amount of potassium chlorate and puts it into a test tube to heat it, wait for oxygen to be released for a few minutes, stop heating, and weigh the substances remaining in the test tube in grams after cooling; Then add grams of manganese dioxide to the test tube and continue to heat until potassium chlorate is completely decomposed, then the oxygen collected is grams, and what is the decomposition rate of potassium chlorate when manganese dioxide is not added?

Solution: After the addition of manganese dioxide, potassium chlorate decomposes x

245/96=x/

x = when manganese dioxide is not added, there is potassium chlorate in the mixture remaining in the test tube, and the remaining substance is potassium chloride obtained by the reaction without manganese dioxide, and the mass is.

Assuming that no manganese dioxide is added, potassium chlorate decomposes y

g2kclo3==(△)==2kcl+3o2↑245/149=y/

y= thereupon the mass of the total potassium chlorate is.

Therefore, the decomposition rate of potassium chlorate is.

Answer: When manganese dioxide is not added, the decomposition rate of potassium chlorate is 50

A pile of reactants is decomposable, we heat and decompose, and find that there are still original reactants in the remaining substances, and remove the original reactors with the remaining original reactants, and the percentage obtained is the decomposition rate.

The mass of the matter that is decomposed is the mass of all the matter that is decomposed.

The ratio of the reacted substance to the original substance.

"Decomposition of numbers" refers to the decomposition of addition, 5=0+5, 5=1+4, 5=2+3, 5=3+2, 5=4+1, 5=5+0.

The decomposition of numbers is actually to decompose relatively large numbers into smaller numbers, so as to facilitate children to understand the composition of numbers, and lay a good foundation for them to learn the addition and subtraction of numbers in the future. As a part of the concept of numbers, the decomposition of numbers is a very intuitive way of expression, which plays a very important role in the recognition and addition and subtraction of numbers.

Group decomposition method.

When polynomials. When the number of terms is large, the polynomial can be reasonably grouped, and the group decomposition method can be used to achieve the purpose of smooth decomposition. Of course, it may be necessary to combine other divisions, and the grouping method is not necessarily unique. Eggplanter.

Cross multiplication.

For quadratic trinomials of the shape of ax + bx + c structural features.

Cross multiplication can be considered.

That is, x + (b + c) x + bc = (x + b) (x + c) when the x coefficient is not 1, the mu can also be operated by cross multiplication.

Note: This method can also be considered for the "AX + BX + C" type.

The so-called decomposition rate is as follows

Let something decompose under the condition of a smile source.

Let one of the decomposition products be split as a, which under ideal conditions can completely decompose to n moles a, but actually generate m moles, i.e.,

The decomposition rate of a is m n

1. The whole is divided into parts;

2. Divide into several simpler compounds and divide them into constituent components or elements;

3. Explanation, commonly found in chapter back**.

synonyms: know, understand, analyze, understand, analyze, comprehend, dissect, elucidate, dissect, dissect, comprehend, dissect, comprehend.

Antonyms: compound, mix, mix, combine, synthesize.

Percentage of degradation.

The mass of the degraded substance The mass of the completely degraded substance) x 100%.

The degradation rate is generally relative to the solid reactants, the total mass of a substance is m, if the reaction is complete, its degradation rate is m m 100% = 100%, if there is still the mass of this substance m left, then its degradation rate is (m-m) m 100%, the degradation rate can reflect the degree of degradation reaction of the substance.

Calcium bicarbonate. The chemical equation for thermal decomposition by the family Kai.

Ca(HCO3)2==CaCO3+H2O+CO2 When calcium bicarbonate is completely decomposed, the mass is only reduced by 31 81 of the original mass.

Therefore, only when calcium bicarbonate is completely decomposed, calcium carbonate is generated.

Continue to break down. In order to make the solid mass half of the mass of the original sample.

1.Manganese dioxide increased its mass fraction by 5% before and after the reaction.

2 This increase of 5% comes from the decomposition of potassium chlorate, and the weight of potassium chloride decreased, which is the weight of oxygen generated. This is 5% of the total weight.

The relation between 1 and 2 is the relation of its change.

Suppose there are x grams of manganese dioxide, since the manganese dioxide in this reaction is a tampering agent, the mass before and after the reaction should not change, from which it can be concluded that the mass of the initial mixture is 4x grams, of which the mass of potassium chlorate is 3x grams, the mass of the mixture after a period of time is 10x 3 grams, and the reduced mass is 2x 3 grams, that is, the mass of the oxygen generated, so there is:

2kclo3

2kcl3o2

2x 3 So? As a result, the decomposition rate of potassium chlorate is:

<> such as Dan stove, 2 can be divided into 1 and collapsed beam 1, 1 and 1 are late to transport up to 2.