What is the mass ratio of 2molo3 to 3molo2? What is the ratio of the number of molecules? What is the ratio of the number of oxygen atoms? At the same temperature and pressure, what is the ratio of the number of CO and CO2 molecules in the same volume? What is the ratio of the number of atoms? What is the mass ratio?
How to find the number of atoms in a substance
(senior one chemistry) how many moles is 5.4 ml of water at 4 ° C
If 5.6 g of iron powder is completely oxidized to Fe2O3 powder, the mass of oxygen consumed is _____, Its chemical equation is_________
Science, related chemistry (grade 2) The answer to the description of NaNO2, Na2O2, SO2, O2 and other four substances: they all contain two oxygen atoms Why is it wrong? (2 is in the lower right corner)
Oxygen gain must be oxidized and oxygen loss must be reduced, right
Add the solutions of the following four substances a into four beakers containing 10ml 2mol / L hydrochloric acid respectively, and dilute them to 50ml with water. At this time, a and hydrochloric acid react slowly, and the maximum chemical reaction rate in the middle of the period is () A.10mL 1mol/L B.20mL 1mol/L C.10mL 2mol/L D.20mL 2mol/L
Explore whether chemical reaction can occur between potassium carbonate solution, dilute hydrochloric acid and barium hydroxide solution Pour all waste liquid into the same clean beaker. What is the final solute in the indicator beaker? I think potassium chloride and barium chloride are possible, but some people say potassium chloride must be. Why?
Ammonia and hydrochloric acid are mixed in equal volume. How to write proton conservation? How did you analyze it Equal concentration
Is the formation of water and oxygen by hydrogen peroxide an oxidation reaction? By the way, if the reaction produces oxygen, but there is no oxygen in the reactant (as reflected by hydrogen peroxide), is it an oxidation reaction?
Normal saline is a sodium chloride solution with a mass fraction of 0.9% When treating patients with severe dehydration acidosis, the mixture of normal saline and sodium bicarbonate solution is commonly used. The mixture can be prepared with 2.0kg normal saline and 1.0kg sodium bicarbonate solution with a mass fraction of 1.4%. The mass fractions of chlorine and sodium in the mixture are basically the same as those in plasma Please calculate the concentration in 100.0ml plasma: Mass of chlorine= Mass of sodium= (write the calculation formula, and the plasma density is regarded as 1.0g / cm ^ 3) Please write down the reason Can you say it more carefully? Some parts still don't understand
How to prove that diamond is a simple substance composed of carbon
How to measure the degree of high voltage electric energy? Active watt hour meter: 349.7, reactive watt hour meter: 311.0, rated dynamic stability current ratio: 185 times, rated short-circuit thermal current ratio: 75 times, and the progress of connecting transformer is 40 / 5 amps Q: can the power consumption of the user be calculated according to the above data? Yes, what is the power consumption?
For a batch of cement, 12 tons are used, and the rest is 5 tons 9. How many tons of this batch of cement?
Why control the content of sulfur trioxide in cement
Put 0.02mol of the first metal in the following groups into 1L 0.01mol/l hydrochloric acid respectively. After the reaction is completed, add 0.01mol of the second metal respectively. The most hydrogen released in the whole reaction process is () a.zn al b.k mg c.na al d.na K. what are the specific steps,
Shanghai Science and Technology Press senior one chemistry workbook answers
Chemical problems of quantity and concentration of higher substances The laboratory is equipped with 100ml of 1mol / L sulfuric acid. How many ml of 98% concentrated sulfuric acid (density of 1.84g / ml) should be taken?
The following reactions are carried out in a closed container: 2so2 + o22so3. It is known that at a certain time in the reaction process, the concentrations of SO2, O2 and SO3 are 0.2mol/l, 0.1mol/l and 0.2mol/l respectively. What is the concentration range of SO2, O2 and SO3 in this reversible reaction? And explain how this range is derived
What is the ratio of the number of molecules contained in O2 and O3? If the mass of O2 and O3 are equal, the ratio of molecular number is? Ratio of oxygen atoms?
Select the appropriate serial number and fill in the blanks Select the appropriate serial number and fill in the blanks ① Qingqing pasture ② virgin forest ③ lush vegetation ④ Millennium snow ⑤ a thousand miles ⑥ mighty ⑦ coconut trees and blue sea ⑧ thousands of gullies ⑨ endless China's top______ Mount Everest, yes______ The Loess Plateau, there are______ Xishuangbanna, yes______ North China Plain, there are______ The Yellow River, yes______ The Yangtze River, the Xingan Mountains, There are ____ in Hainan Island, There is a vast __ in the northwest, There are endless rivers and lakes swamps Use the top score. OK, I'll add 50!
(multiple choice) which of the following substances is pure? A liquid oxygen B hydrogen peroxide solution C air D clear lime water
Choose the appropriate form to fill in the blanks There is ____ "y" and ____ "s" in the word "yes"
What is the difference between chemical purity, mixture and compound
Separation and purification of chemical mixture in junior middle school 1. Operation method of evaporation: 2. Instruments for distillation: 3. Main instruments used for liquid separation: I hope the person who knows can give me the answer to the inner question and indicate the question number
The following groups of ions must coexist in large quantities in solution is () The following groups of ions must coexist in large quantities in solution is () A．H+、Cl-、OH- B．H+、SO42-、CO32-C．Ba2+、H+、SO42- D．Cu2+、Na+、NO3-
A group of ions that can coexist in large quantities in the following solutions are A. In the solution with pH = 1: NH4 +, Fe2 +, sulfate, chloride ion B. Solution of excess sulfur dioxide gas: iron ion, nitrate, barium ion and hydrogen ion C. In the solution with aluminum ion concentration of 0.1mol/l: sodium ion, potassium ion, metaaluminate ion and sulfate D. In the solution with hydrogen ion concentration of 1 * 10 ^ - 13mol / L ionized by water: sodium ion, bicarbonate ion, chloride ion and bromine ion
Find the chemical formula of hydrocarbon The experimental results show that the product is CO2 CO and water vapor concentrated H2SO4 alkali lime combustion product ------------ → weight gain of 2.16G ------ → CO2 (1.76g) - ------ → CO2 (0.88g)
Judgment: ① gasoline, diesel and vegetable oil are all hydrocarbons (analysis) ② Organic compounds with 5 carbon atoms can form up to 4 carbon carbon single bonds per molecule (analysis)
Relationship between density and temperature of 93 gasoline ρ=ρ 20-0.00081(t-20), ρ What is the standard density of 20? Is 0 Relationship between density and temperature of 93 gasoline ρ=ρ 20-0.00081(t-20), ρ What is the standard density of 20? Many people give inaccurate information. Please give an accurate one,
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