The relative mass fraction of carbon in a hydrocarbon is 83.3% determined by combustion analysis experiment. (1) if there is only one absorption peak on the hydrogen NMR spectrum of the hydrocarbon, the structural formula of the hydrocarbon is --, and the name of a hydroxyl substituent is --. (2) if the hydrocarbon is obtained by adding H2 to monoolefin, there are -- monoolefins that meet the conditions

The relative mass fraction of carbon in a hydrocarbon is 83.3% determined by combustion analysis experiment. (1) if there is only one absorption peak on the hydrogen NMR spectrum of the hydrocarbon, the structural formula of the hydrocarbon is --, and the name of a hydroxyl substituent is --. (2) if the hydrocarbon is obtained by adding H2 to monoolefin, there are -- monoolefins that meet the conditions

The first question is 2,2-dimethyl-1-propanol, and the second question is five
I don't quite understand the specific steps

In order to judge whether a compound contains carbon, hydrogen and oxygen, a certain mass of the compound should be fully burned in oxygen. The following experiments are needed: (1) using anhydrous copper sulfate to check whether there is water formation; (2) using clear lime water to check whether there is carbon dioxide formation; (3) using wood strips with Mars to check oxygen; (4) determining the mass of water and carbon dioxide
A. ①②③B. ①②④C. ②③④D. ①②③④

Copper sulfate is a white powder. When it meets with water, it will produce copper sulfate pentahydrate and turn blue, indicating that water is formed, that is, the compound contains hydrogen element. When the lime water becomes turbid, it indicates that there is carbon dioxide, that is, the compound contains carbon element. The judgment of oxygen element can only be judged according to the quality calculation

To test whether a combustible compound contains carbon, hydrogen and oxygen, the tests that must be carried out after burning the substance in oxygen or air are ()
1. Test with a spark stick
2. Test with anhydrous copper sulfate
3. Test with clear lime water
4. Weigh the reactants and products
A.1234 B.234 C.123 D.23

To judge whether there is h with anhydrous copper sulfate, to judge C with clear lime water, to judge whether there is O can only be measured by weighing

In order to judge whether a compound contains carbon, hydrogen and oxygen, a certain mass of the compound is taken to burn fully in oxygen,
Is it OK to measure the mass of carbon dioxide in water? Why?
Make it clear

Yes, I can
Methods: take a certain mass (10g) of the compound to burn fully in oxygen, and measure the mass of water = XG, the mass of carbon dioxide = YG. We can find out the mass of H in water and the mass of C in carbon dioxide. If the sum of the two parts is equal to the total mass of organic matter, then only C and H are contained. On the contrary, if the sum of the two parts is less than 10g, it means that the organic matter contains oxygen. Do you understand?

To test whether a combustible compound contains carbon, hydrogen and oxygen, the following experiments must be carried out after the material is burned in oxygen or air:
How to judge the presence of oxygen by weighing the reactants and products?

The products of CO2 and H2O are weighed respectively to obtain the mass of C H in the original compound. If the mass of the compound is higher than the sum of the mass of the two elements, the rest mass is o

What is the pronunciation of saving money
Save
zǎn
To save money. Accumulate.
cuán
To scrape together. Gather. save up money. Save your eyebrows. Gather fire (concentrated fire). Gather together.
Is it OK to read Z ǎ n or Cu á n?

Saving money is the sum of money you earn
Cu á n is to fight for money everywhere and gather the money collected everywhere
My personal opinion is for reference only

Both Xiaohong and Xiaofang have saved some pocket money. The ratio of their savings is 5:3. In the donation activity of "supporting the disaster area", Xiaohong donates 26 yuan and Xiaofang donates 10 yuan. At this time, they have the same amount of money left. How much money did Xiaohong have?

26-10 = 16 (yuan), 16 ^ (5-3) = 8 (yuan), 8 × 5 = 40 (yuan); or: (26-10) ^ (5-3) × 5 = 16 ^ (2 × 5, = 8 × 5, = 40 (yuan); answer: Xiaohong originally had 40 yuan

The ratio of the amount of money saved by Party A and Party B in the bank is 5:3. Because Party B later deposited 4400 yuan, the amount of money saved by Party A is equivalent to 75% of that of Party B. how much yuan did party a deposit?

After the deposit of 4400 yuan, the amount of money saved by Party A is equal to 75% of that of Party B. the amount of money saved by Party A: the amount of money saved by Party B: 75%: 1 = 3:4, 3 + 4 = 7, the amount of money saved by Party B accounts for 47, 5 + 3 = 8 of the total. The amount of money saved by Party B originally accounts for 384400 △ 47-38) × 37 = 4400 △ 1156 × 37 = 22400 × 37 = 9600 (yuan). A: 9600 yuan

The ratio of the amount of money saved by Party A and Party B in the bank is 5:3. Because Party B later deposited 4400 yuan, the amount of money saved by Party A is equivalent to 75% of that of Party B. how much yuan did party a deposit?

After the deposit of 4400 yuan, the amount of money saved by Party A is equal to 75% of that of Party B. the amount of money saved by Party A: the amount of money saved by Party B: 75%: 1 = 3:4, 3 + 4 = 7, the amount of money saved by Party B accounts for 47, 5 + 3 = 8 of the total. The amount of money saved by Party B originally accounts for 384400 △ 47-38) × 37 = 4400 △ 1156 × 37 = 22400 × 37 = 9600 (yuan). A: 9600 yuan

Both Party A and Party B deposit X Yuan in the bank. Later, Party A deposits 800 yuan and Party B withdraws 1200 yuan. As a result, Party A's deposit is three times that of Party B
Equivalence relation: --————————
Equation:——————

X+800=3(X-1200)
X+800=3X-3600
2X-3600=800
2X=4400
X=2200