Does the volumetric flask have a zero scale, and does the volumetric flask have a scale

A volumetric flask, measuring cylinder and burette are marked with a scale, to avoid thermal expansion and contraction when using, so the use temperature is marked, the measuring cylinder "0" scale is the base, the volumetric flask only has the largest capacity of a scale, so both have no "0" scale, the burette needs to be washed after washing, but the volumetric flask does not need to be washed after washing because it also needs to add water to determine the volume, so a is correct; b At room temperature, phenol is slightly soluble in water, and ethanol is miscible with water, add 1ml of absolute ethanol and phenol solid in two test tubes, and then add the same amount of sodium, phenol solid and sodium do not react, so it is impossible to compare the activity of hydrogen atoms on ethanol and phenol hydroxyl group, phenol should be dissolved with ether, and then compared, so b is wrong; c Use paper chromatography to check whether there is a small amount of copper chloride mixed in the ferric chloride solution, when the chromatography is blue-green, it means that it contains copper chloride, so c is correct; d When the potassium nitrate saturated solution is cooled and no crystallization appears, the wall of the vessel is fully rubbed with a glass rod to produce glass fragments, so that a "center" can be found to gather and let the crystals precipitate, so d is correct; Therefore, choose B

a Volumetric flasks.

The measuring cylinder and burette are marked with the use temperature, the measuring cylinder and volumetric flask have no "0" scale, and the burette has a "0" scale; When using, the burette needs to be rinsed after washing, so a is correct; b Add dilute hydrochloric acid first, silver ions and carbonate ions can be excluded, and then add BaCl2 solution, and the precipitate can only be barium sulfate.

Bacl2 solution and dilute hydrochloric acid were added sequentially to produce a white precipitate, which may be barium sulfate or silver chloride, so B is wrong; c can not be put into the bottom of the above-mentioned gas collection cylinder, should be clamped and burned with crucible pliers, so c is wrong; D Naclo has strong oxidizing properties and cannot be tested with pH test strips.

Measurement, so d is wrong, so choose a

Volumetric flasks have only one tick mark, one capacity. Volumetric flasks are all large and thin, which is to be able to accurately determine the volume. If you've ever seen a volumetric flask, you'll know that it's a pear-shaped bottle with a thin and long neck to prepare the solution accurately.

Does the bottleneck of the volumetric flask have to be made like a burette? It's easy to break. As shown in the figure below.

It is to reduce the adhesion reagent above the scale mark, resulting in the inaccurate concentration of the quasi-solution on the other side.

a. There is no zero scale on the volumetric flask

b. The volumetric flask cannot be used for heating, and the prepared solution cannot be stored with the volumetric flask c. The volumetric flask cannot be used to dilute the concentrated solution or dissolve the solid, and can only be used to prepare the solution, so it is wrong;

d. The volumetric flask is an instrument with accurate volume, so it is correct

Therefore, d

BA Volumetric flasks, graduated cylinders and burettes are marked with the operating temperature, while graduated cylinders and volumetric flasks are not"0"There is a scale, a burette"0"Scale; The narrative about the identification of the instrument is correct. When using, the burette needs to be rinsed after washing, otherwise the concentration of the solution will be changed, but the volumetric flask should not be washed after washing, otherwise the concentration of the prepared solution will become larger; aReasonable; b Add 1ml of absolute ethanol and phenol solids to two test tubes, and then add the same amount of sodium in the same volume, compare the activity of hydrogen atoms on ethanol and phenol hydroxyl groups, due to different initial conditions, it is impossible to draw correct conclusions, b is incorrect; c Paper-based chromatography is suitable for micro-separation and testing of molecules or ions with very similar chemical properties, and paper-based chromatography is used to test whether a small amount of copper chloride is mixed in the ferric chloride solution, which is reasonable; d Add crystals, rub the beaker wall, produce glass fragments, excessive cooling, stirring with glass rods so that you can find a "center" to gather up to let the crystals precipitate, when the potassium nitrate saturated solution is cooled and no crystallization appears, you can use the glass rod to fully rub the wall of the vessel to promote the crystal precipitation, d is correct; Pick B.

a, the volumetric flask is marked with temperature, specifications, scale marks, the measuring cylinder is marked with temperature, specifications, burette temperature, specifications, measuring cylinders, volumetric flasks without "0" scale, burette has "0" scale at the top, when using the burette after washing still need to be washed, but the volumetric flask does not need to be washed after washing, so a is correct;

B. Potassium permanganate has strong oxidation, and the alkaline burette cannot be used, and the acid burette should be used, so B is wrong;

C. The pH test paper cannot be wetted when used, and after wetting the pH test paper with distilled water, it is equivalent to the NaOH solution being diluted, the alkalinity is weakened, and the pH is reduced, so C is wrong;

d. Stirring the liquid in the filter with a glass rod may break the filter paper and make the experiment fail, so D is wrong;

So choose A

Generally, the temperature of the measuring instrument is marked, which is generally room temperature, that is, about 25 degrees. That's a lot without a zero scale, for example, graduated cylinders, volumetric flasks, funnels.

The description of the title is not clear.

Is it a container or a thermometer?

a Volumetric flasks, measuring cylinders and burettes are marked with the use temperature, and there is no "0" scale for measuring cylinders and volumetric flasks, and there is a "0" scale for burettes; When using, the burette needs to be rinsed after washing, so a is correct;

b Add dilute hydrochloric acid first, silver ions and carbonate ions can be excluded, and then add BaCl2 solution, the resulting precipitate can only be barium sulfate, and add Bacl2 solution and dilute hydrochloric acid in turn to produce white precipitate, which may be barium sulfate or silver chloride, so B is wrong;

c can not be put into the bottom of the above-mentioned gas collection cylinder, should be clamped and burned with crucible pliers, so c is wrong;

D Naclo has strong oxidizing properties and cannot be measured with pH test paper, so D is wrong so choose A

Beakers, measuring cups, graduated cylinders, Erlenmeyer flasks, iodine measuring flasks, pipettes, volumetric flasks, reagent bottles, etc. (these are all instruments with volume and no 0 scale). Hope it helps

Graduated cylinders, measuring cups, mechanical stopwatches...

a Volumetric flasks, measuring cylinders and burettes are marked with the use temperature, and there is no "0" scale for measuring cylinders and volumetric flasks, and there is a "0" scale for burettes; When using, the burette needs to be rinsed after washing, otherwise there will be an error, but the volumetric flask does not need to be rinsed after washing, if it is washed, it will lead to a large concentration, so a is correct;

b 2ml of ether should be added to each of the two test tubes, 1ml of absolute ethanol should be added to one of the test tubes, phenol solid should be added to the other test tube, and the same amount of sodium of the same volume should be added.

c The following equilibrium CoCl4 is present in the cobalt chloride solution

Blue ) +6h2

o?co（h2o）6

Pink ) +4cl-

When concentrated hydrochloric acid is added to the solution, due to the increase of chloride ion concentration, the equilibrium moves in the direction of the reverse reaction, and the solution changes from pink to blue, when determining the reaction rate of some reactions, a spectrophotometer can be used to perform colorimetric analysis for some colored reactants or products, and the reaction rate is calculated according to the relationship between the color of the solution and the concentration of reactants or products at different reaction moments, so c is correct;

d The evaporation dish is placed on a water bath for evaporation, concentration until a crystalline film appears on the surface, and then placed for cooling, and (NH4

so4feso4

6H2O crystals, the solution cannot be evaporated completely in case it cannot be obtained (NH4

so4feso4

6H2O crystal, so d is correct;

Therefore, choose B