What is the purpose of alcohol decolorization in photosynthesis? Experiments on Photosynthesis

What is the purpose of alcohol decolorization in photosynthesis? Experiments on Photosynthesis

The starch produced by photosynthesis turns blue with iodine, and the chlorophyll is dissolved by alcohol to eliminate the influence of chlorophyll on color

Summary of the role of hydrochloric acid in senior high school biology experiment

① (2) 15% hydrochloric acid and 95% alcohol: dissociation. For example, observe the mitosis of plant cells, observe the change of chromosome number under low temperature. (concentrated hydrochloric acid can kill cells. Concentrated hydrochloric acid can not only dissociate cells, but also fix cells

Who can help me summarize the solutions and solvents used in high school biology experiments (such as 95% alcohol, etc.)
Give me a full and accurate score

1、 Feilin reagent: solution A: 0,1g / ml NaOH solution; solution B: 0,05g / ml CuSO4 solution. Function: to detect reducing sugar. 2. Biuret reagent: solution A: 0,1g / ml NaOH solution; solution B: 0,01g / ml CuSO4 solution. Function: to detect protein. 3. Sudan Ⅲ: to detect fat. 4. Iodine solution: to detect starch. 5

The exhaust volume of automobile engine (equal to piston area s * piston moving distance L) is 3.0 L, and the average pressure of gas to piston is 0.5
8 * 105 cubic Pascal, one working cycle, the work done by gas to piston ----- J

3.0L=0.003m³
P=800000pa
F=PS
W=FL=PSL=P*0.003=800000*0.003=2400J

Given that the exhaust volume of an automobile engine is V and the average pressure of the gas in the cylinder during the power stroke is p, the unit of PV may be the same as that of the following physical quantities
A power
B work
C force
D speed

P=F/S
V=Sh
PV=Fh
H is high, and the unit is the same as the displacement
So work w = FS is the same as PV unit

What do the letters L, m and t mean!

L is the cylinder block in-line arrangement, t is the engine with turbocharging, M is the manual gear

How to calculate the average pressure in the cylinder during the power stroke?
Six cylinders, 110mm in diameter, 135mm in piston stroke, 2300r / min in speed, 220kw in power, 43000000j / kg in calorific value of diesel oil and 240g / (KWH) in minimum fuel consumption
Answer before the 16th!

One minute work w = Pt = 220 * 1000W * 60s = 1.32 × 10 & # 710; 7J
Times of work per minute (2300 / 2) * 6 = 6900
One time work W '= 1.32 × 10 & # 710; 7J / 6900 = 1913j
W = FS, average pressure f = w '/ S = 1913j / 0.135M = 14170n
Average pressure P = f / S = 14170n / (3.14 * 0.055m * 0.055m) = 1.5 × 10 & # 710; 6pa
1.32×10ˆ7J=11/3kwh
Oil consumption 240g / (KWH) * 11 / 3kwh = 0.88kg
The heat released by diesel combustion q = MQ = 0.88kg * 43000000j / kg = 3.784 × 10 & # 710; 7J
Heat engine efficiency: η = w / Q = 1.32 × 10 & # 710; 7J / 3.784 × 10 & # 710; 7J = = 35%

Know how to calculate the force of the cylinder
For example, how to calculate the force when the cylinder diameter is 32mm? Is there a formula

It also depends on the air pressure of your cylinder. When I used to do it, I always set it at five atmospheres. (of course, it can be bigger, but there will be other problems when it is bigger). If the diameter is 32mm, you can calculate the area of the piston. Five atmospheres minus one atmosphere (air pressure) can get the effective pressure. The effective pressure is multiplied by the area force. Of course, If accurate calculation is needed, the area of cylinder rod should also be considered. In this way, the force of cylinder extension and retraction is different. The difference is the product of effective pressure and cylinder rod cross-sectional area. But the product is very small
Usually, the thrust calculation formulas of different types of cylinders are provided in the cylinder selection manual, and the reference thrust of different diameters under different pressures are provided. Which one should be taken as the standard

The size of the cylinder diameter pressure is not the same. How to calculate
For example: what are the pressures of Φ 50 * 100 cylinder and Φ 100 * 100 cylinder?
The pressure of gas source is 6kg

The maximum pressure produced by the air pump is p MPa
Or the pressure of gas source is p MPa
The cross-sectional area of cylinder a mm2 should be calculated
Pressure = a * P / 10000 tons
It has nothing to do with the length of the cylinder
Supplement, Φ 50 pressure = 3.14 * 25 ^ 2 * 0.6 = 0.117 tons
Φ 100 pressure = 3.14 * 50 ^ 2 * 0.6 = 0.471t

Calculation formula of cylinder thrust and tension

The picture is the formula