![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
Write a literal expression of the chemical reaction that meets the following requirements 1. Formation of a combination reaction which can make the clarified lime water turbid 2. In the product, there is a decomposition reaction of the amount gas which can make the wood strip with Mars reburning （1）（2） 3. Formation of colorless and pungent chemical reactions 4. Formation of black solid 5. The combination reaction that produces a lot of white smoke 6. It is neither a combination reaction nor a decomposition reaction 7. It's just an oxidation reaction, but not a combination reaction 8. Intense combustion, produce dazzling white light reaction
1. Calcium hydroxide + carbon dioxide ----- > water + calcium carbonate 2, (1) potassium permanganate --- heating ----- > potassium permanganate + manganese dioxide + oxygen (2) hydrogen peroxide --- power on ----- > water + oxygen 3, sulfur + oxygen --- ignition ----- > sulfur dioxide 4, iron + oxygen --- ignition ----- > ferric oxide 5, red phosphorus + oxygen --- ignition
What's the difference between chemical symbolic expression and chemical equation?
If you want me to write symbolic expressions, can I write chemical equations?
What's the difference between the two?
The former doesn't need to be balanced, and the latter needs to be balanced
Generally, it's right to write equations. As for symbolic expressions, just know
What's the difference between symbolic expression and chemical equation? When should we write which one?
Symbolic expression: it is a chemical reaction formula expressed by chemical formula. It does not add an equal sign to write the arrow without balancing. It is not an equal sign in the middle, and it is connected by a short line. It roughly represents the chemical reaction without learning the conservation of mass. It is just a transition state. Chemical equation: it is also a chemical reaction formula expressed by element symbol
How to calculate the total number of samples with known frequency and frequency in high school frequency distribution histogram
Kneel down for detailed explanation
Frequency divided by frequency, you give me a specific question
The formula of probability
The teacher said it recently, but I didn't listen to it,
It seems that the teacher also divided into two categories, put back and do not put back
Find specific examples and solutions
A is sequential, C is non sequential
What is the formula for median
The median is the value in the middle after data sorting. For example, the median of 1471113 is the position of 7 m = (1 + n) / 2
How to find the median after grouping? The following is the formula for finding the median after grouping
This is the lower limit formula. L is the lower limit value of the group where the median is located. If the range of the group is 200-400, then l is 200. 1 / 2efi --- it can be understood as half of the total weight. Add the weights of each group and divide them by 2sm-1 --- accumulate the permutation weights first. Your formula is the lower limit formula, so you can use the method of upward accumulation
What is the approximate formula for finding the median?
In the frequency distribution histogram, what is the approximate formula for finding the median?
Median: arrange the data according to the size. If there are odd numbers and the total number is n, the median is n + 1 divided by 2; if there are even numbers, the median is n divided by 2
Calculate the median according to the frequency distribution table
RT. how?
First determine the total number, if it is odd, take it (total number △ 2-0.5 method), if it is even, take it (total number △ 2, and the average of total number △ 2 + 1)
If the first column of the frequency distribution table is 5, then 1-5 numbers are on the numbers in the first column, and so on, we can know which number is in the first column, and determine the median
It's not hard to look bored
What is the meaning of median?
It reflects the general situation of a group of numbers. From the definition of median, half of the data studied are less than median, and half are greater than median
❤ your question has been answered ~ ~ (> ^ ω)^
RELATED INFORMATIONS
- 1. The chemical equation of the symbolic expression of the reaction equation of copper heated in air
- 2. Is chemical equation literal expression or symbolic expression
- 3. Chemical formula and literal expression of carbon dioxide produced by reaction of calcium carbonate and dilute hydrochloric acid?
- 4. In junior high school, the principle of common factor is put forward, 1. Decomposition common factor: 2x (A-2) + 3Y (2-A) 2. The common factor of polynomial A & # 178; - 2Ab + B & # 178;, a & # 178; - B & # 178; is (?) 3. Given X & # 178; + X-1 = 0, find the value of the cubic power of X + 2x & # 178; + 1999
- 5. On the pursuit of the equations in the seventh grade
- 6. A batch of saplings will be planted. If each person plants 10 saplings, the remaining 6 saplings will not be planted. If each person plants 12 saplings, the remaining 6 saplings will be missing. How many people plant trees? List the equations according to the meaning of the question
- 7. Solving problems by solving equations 1. There are 874 seats in the school auditorium, with a total of 23 rows. Each row has the same number of seats. How many seats are there in each row?
- 8. Write a composition about saving water, use the statistical knowledge learned in math class! In ten minutes,
- 9. Who has a good way to learn mathematics
- 10. The story of using mathematical knowledge in life Quality and quantity
- 11. Write down the following chemical reactions (1) Light yellow solid combustion_____________________________________________ (2) Preparation of oxygen by heating pure substance in laboratory_____________________________________________ (3) Heated light green powder_____________________________________________ (4) A metal burns in air_____________________________________________ (5) Reaction of producing colorless and odorless gas after combustion_________________________________________
- 12. Find a regular expression to judge whether the nicknames are letters, numbers, underscores and Chinese characters, and the length cannot exceed 16
- 13. The canteen bought some flour. On the first day, they ate half of the whole flour, which was less than 28 kg. On the second day, they ate the remaining half, which was less than 8 kg. Finally, they had 122 kg. How many kg of flour are there?
- 14. Circumference formula and area formula of semicircle fast
- 15. A few math problems of grade one in junior high school· The value of (x + y) ^ 3 (2x + 2Y) ^ 3 (3x + 3Y) ^ 3? 10 ^ α = 20, 10 ^ β = 5 ^ - 1, then the value of 9 ^ α / 3 ^ 2 β is?
- 16. Finding the knowledge points of the first chapter of mathematics triangle
- 17. When deducing the area formula of a circle, the circle is divided into several equal parts to form an approximate rectangle. The length of the rectangle is 6.42cm more than the width, and the area is? In the derivation of the area formula of a circle, the circle is divided into several equal parts to form an approximate rectangle. The length of the rectangle is 6.42cm more than the width, and the area is ()
- 18. Input the radius and write the program to calculate the area and perimeter of the circle with VB In order to ensure the correct operation of the program, the input radius is checked legally. The IsNumeric function is called to check the data. The msgbox is used to first send the error message, and the result is reserved for two decimal places. The area and perimeter are required to be completed by two commands. The radius is controlled by a label
- 19. All the formulas (including the deformation formula) of physical electricity in grade two of junior high school Find all the formulas of electricity in the second grade of junior high school!
- 20. W = FS w = GH = MGH w = FS unit of physical quantity