Measure the density of a certain cooking oil with a balance, graduated cylinder, or glass, and write

1.The total mass of the glass and the cooking oil is measured with a balance m1.

2。A portion of the cooking oil is poured into a graduated cylinder, the total mass m2 of the remaining glass and cooking oil is measured with a balance, and the volume v of the cooking oil in the measuring barrel is read.

3。The density (m1-m2) v is calculated

First of all, you can't accurately calculate the density of the oil with this method, because the accuracy of the graduated cylinder is affected.

The method is very simple, first weigh out the mass m1 of the graduated cylinder, and then use the measuring cylinder to measure a certain volume of oil, such as 500ml, and then weigh out and m2, the density is (m2-m1) 500, you can, pay attention to the conversion of the unit.

The correct method should be to measure with a density cup, which is a specialized measuring tool.

1) Place the balance on the horizontal table, move the yard to the zero scale, and then adjust the balance nut balance nut to balance the balance beam

2) Perform the following experimental operations: The correct order of the following operations is:

BAC alphabet code).

a Pour a part of the edible oil in the beaker into a graduated cylinder and measure the volume v of this part of the edible oil;

b. Pour the edible oil to be measured into the beaker, and measure the total mass m2 of the beaker and the edible oil with a balance;

c. Measure the total mass of the beaker and the remaining cooking oil m1 with a balance;

3) It has been measured that m1 is 110g, and according to the number in the figure, the density of this edible oil is calculated.

Answer: Experimental procedure: socks flushing.

1) Measure the mass of the empty glass with a judging balance m 1;

2) pour the cooking oil into a glass and weigh their total mass with a balance m2;

3) Calculate the mass of edible oil: m=m2 -m1;

b Balance the glass and pour the mass of alcohol m2

C. The balance weighed out the glass and poured part of the alcohol in the mass of the remaining wine in the m3d, and the volume in the graduated cylinder was clearly V

EP wine = (m2-m3) v

The dosage of B was measured to show the volume of essential oil v1

c. Pour part of the essential oil in the graduated cylinder into the glass, measure the quality of the essential oil and the glass, measure the remaining essential oil, and measure the remaining essential oil body bridge V2

Then it was calculated m2-m1 v1-v2

The correct steps should be: 1. Pour an appropriate amount of cooking oil into the beaker, and measure the total mass of the cup and oil m (b) with a balance

2. Pour the oil in the beaker into the graduated cylinder and read out the volume of oil v(c)3、Use a balance to measure the mass of the beaker after pouring out the oil m(d)Then you can calculate the density of the oil according to the density = mass volume = (m-m) v.

As for not choosing A, it is because some of the oil will stick to the beaker wall after pouring out the oil, causing errors, so the quality of the beaker should be weighed after pouring the oil to make the result accurate.

I hope it can help you, and I wish you progress in your studies!

In Xiao Ming's experiment, the mass of the empty beaker is 14g, and the total mass of the beaker and oil is 62g, so the mass of the oil should be 62g-14g=48g, so option A is wrong

In this experimental design, the mass of the empty beaker is measured first, and then the total mass of the beaker and the oil is measured, so the difference between the two masses is the quality of the oil, and then the oil in the beaker is poured into the graduated cylinder to measure the volume of oil, in this process, because the oil will have a certain residue when poured out of the beaker, the volume of oil measured by the graduated cylinder will be less than the volume of oil in the original beaker, so according to the formula = m

v can be seen that the volume measurement value is smaller than the true value, and the measured density is larger than the true value, so b is selected

To measure the density of the liquid, if the mass of the beaker is measured first, then the total mass of the beaker and the liquid, and finally the liquid is poured into the graduated cylinder to measure the volume, this practice will make the measured volume small due to the sticky liquid on the beaker wall, resulting in the calculated liquid density being large

In order to prevent experimental errors caused by the sticky liquid on the wall of the container, the total mass of the beaker and liquid should be measured first, then the liquid should be poured into a graduated cylinder to measure the volume, and finally the mass of the remaining liquid and the beaker should be measured, using the density formula = m

v calculates the density of the liquid, so option a in this problem is not necessary to measure the mass of an empty beaker with a balance, so choose a

Use the balance to measure the mass of the empty beaker as m1, and then measure the mass of the beaker with water as m2, then the mass of the water is m2-m1, so the volume of the beaker is v=(m2-m1)x1=m2-m1, and then add it to the beaker, full of cooking oil, and measure the mass of m3, then the mass of the oil is m3-m1, so the density of the oil is m3-m1 m2-m1

b Use the balance to measure the mass of the empty glass as m0;

c. Make a mark on the glass with a marker, add water to the glass to the mark, and measure the total mass of water and cup with a balance of m1;

d Pour out all the water in the cup, wipe it dry with a dry rag, add cooking oil to the glass to the mark, and measure the total mass of the oil and the cup m2 with a balance

2) M water = m1-m0, m oil = m2-m0

According to =mv, v-water = m-water

Water = m?mρ

Water, v oil = m oil

Oil = m?mρ

Oil, v water = v oil, m?m water.

m?m oil.

Oil = m?mm

m water So the answer is: (1) zero, balance nut, cooking oil to the mark, the total mass of oil and cup m2; （2）m?mm

m water.

The correct way to measure the density of the liquid is: first adjust the balance according to the requirements, measure the total mass of the beaker liquid m1, pour an appropriate amount of liquid into the graduated cylinder to measure the volume v, and then measure the remaining beaker liquid mass m2 liquid density = mmv

Therefore, the answer is: scheme 1: (2) m2

M1 scheme 2: (5) mmV

Scheme 1 "Disadvantages": In step (3), when the cooking oil in the beaker is poured into the graduated cylinder, some of the oil will not be clean

Scheme 2 "Deficiencies": Before adjusting the balance nut in step (l), the free code is not adjusted to the zero line

Prepare options: two; In step (1), after the balance is placed on the water platform, the traveling code is adjusted to the zero marking position, and then the balance nut is adjusted to balance the beam