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NemiM [27]
3 years ago
7

Give the volume indicated. Be sure to include all significant figures. 9.2 9.16 9.26

Chemistry
2 answers:
Novosadov [1.4K]3 years ago
5 0

Answer : The correct value of volume is, 9.16

Explanation :

Accuracy : It is defined as the closeness of a measured value to a standard or known value.

For Example: If the mass of a substance is 50 kg and one person weighed 48 kg and another person weighed 55 kg. Then, the weight measured by first person is more accurate.

Precision : It is defined as the closeness of two or more measurements to each other.

For Example: If you weigh a given substance five times and you get 1.8 kg each time. Then the measurement is said to be precise.

Level of precision is determined by the maximum number of decimal places.

As we know that for the measurement of the volume of liquid in graduated cylinder are shown by placing the graduated cylinder on the flat surface and then view the height of the liquid in the graduated cylinder with the naked eyes directly level with the liquid.

The liquid will tend to curve downward that means this curve is known as the meniscus.

In the case of colored liquid, we are always read the upper meniscus of the liquid for the measurement.

In the case of colorless liquid, we are always read the lower meniscus of the liquid for the measurement.

In the given image, there are 5 division between the 9 and 9.5 and the smallest division is, 0.1. So, the volume of liquid will be, 9 + 0.16 = 9.16

Thus, the correct value of volume is, 9.16

Gemiola [76]3 years ago
3 0

Answer:

The volume indicated would be closest to 9.16

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Answer:

Heat is the sum of all the kinetic energies of all the molecules of an object, while temperature is the average kinetic energy of the molecules of an object

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Which common material is an example of a polyamide?
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Nylon 6,6 is a common example of a polyamide.

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The structure of Nylon 6,6 is  

[-NH-(CH_2)_6-<u>NH-CO</u>-(CH_2)_4-CO-]_<em>n</em>

where <em>n</em> is a large number.

The numbers in the name showow that there are six carbon atoms on either side of an amide linkage.

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3 years ago
Describe how to use the periodic table to identify characteristics of elements/atoms.
timofeeve [1]

Answer: The simplest way to use the periodic table to identify an element is by looking for the element's name or elemental symbol. The periodic table can be used to identify an element by looking for the element's atomic number. The atomic number of an element is the number of protons found within the atoms of that element.

5 0
3 years ago
Tenormin, a member of the group of drugs known as beta-blockers, is used to treat high blood pressure and improve survival after
frez [133]

Answer:

Oxygen

Explanation:

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3 0
3 years ago
We have a methanol solution that is 6.0 m methanol, CH 3OH in water. Vapor pressure pure water at 30. degrees C is 31.82 mmHg. V
Mashcka [7]

<u>Answer:</u> The total pressure above the solution at 30°C is 45.29 mmHg

<u>Explanation:</u>

We are given:

Molality of methanol = 6.0 m

This means that 6.0 moles of methanol present in 1 kg or 1000 g of pure water

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Given mass of water = 1000 g

Molar mass of water = 18 g/mol

Putting values in above equation, we get:

\text{Moles of water}=\frac{1000g}{18g/mol}=55.56mol

Mole fraction of a substance is given by:

\chi_A=\frac{n_A}{n_A+n_B}

\chi_{CH_3OH}=\frac{n_{CH_3OH}}{n_{CH_3OH}+n_{water}}\\\\\chi_{CH_3OH}=\frac{6}{6+55.56}=0.0975

\chi_{water}=\frac{n_{water}}{n_{CH_3OH}+n_{water}}\\\\\chi_{water}=\frac{55.56}{6+55.56}=0.9025

To calculate the total pressure, we use the equation given by Dalton and Raoults, which is:

p_T=(p_A\times \chi_A)+(p_B\times \chi_B)

where,

p_T = total vapor pressure  = ?

We are given:

Mole fraction of methanol = 0.0975

Mole fraction of water = 0.9025

Vapor pressure of methanol = 170.0 mmHg

Vapor pressure of water = 31.82 mmHg

Putting values in above equation, we get:

p_T=(170\times 0.0975)+(31.82\times 0.9025)\\\\p_T=45.29mmHg

Hence, the total pressure above the solution at 30°C is 45.29 mmHg

6 0
4 years ago
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