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MARK ALL of the objects that can be found in our Solar System

lapo4ka [179]

Answer A E F C

Explanation: star, planets, moons, dwarf planets, comets, asteroids, gas, and dust.

7 0

3 years ago

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1.Liquids only exert pressure downward.

noname [10]

1. Liquids and gases exert pressure in all directions. Hence, the statement is false.

2. As the depth of liquid increases, so does the pressure. Hence, the statement is true.

3. Pascal's principle states that applied pressure will be transmitted throughout a fluid. Hence, statement C is true.

4. The pressure in a fluid depends only on the depth from the surface and not on the shape of the container. Hence, the statement is false.

5. Archimedes' principle involves buoyancy. Hence, statement C is true.

6. The temperature at which water boils can't be related to the weather. Hence, the statement is false.

7. A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure. Hence, the statement is false.

<h3>What is a barometer?</h3>

A barometer is an instrument used to measure air pressure.

1. Since a fluid has no definite shape, its pressure applies in all directions. Liquids and gases exert pressure in all directions. Hence, the B is true.

2. Pressure increases as the depth increase. The pressure in a liquid is due to the weight of the column of water above. Since the particles in a liquid are tightly packed, this pressure acts in all directions.

3. Pascal's law says that pressure applied to an enclosed fluid will be transmitted without a change in magnitude to every point of the fluid and to the walls of the container. The pressure at any point in the fluid is equal in all directions.

4. The pressure in a fluid depends only on the depth from the surface and not on the shape of the container.

5. Archimedes' principle states that a body immersed in a fluid is subjected to an upwards force equal to the weight of the displaced fluid.

6. Boiling occurs when the vapour pressure reaches or exceeds the surrounding pressure from the atmosphere or whatever else is in contact with the liquid. At standard atmospheric pressure (1 atmosphere = 0.101325 MPa), water boils at approximately 100 degrees Celsius.

Learn more about the barometer here:

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7 0

2 years ago

What are green boxes on periodic tables

finlep [7]

Answer:

The basic metal ones?

Explanation:

...

3 0

3 years ago

What does Avogadro's number represent?

DIA [1.3K]

The number 6.022 × 1023 indicating the number of atoms or molecules in a mole of any substance

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3 years ago

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a) Calculatethe molality, m, of an aqueous solution of 1.22 M sucrose, C12H22O11. The density of the solution is 1.12 g/mL.b) Wh

Contact [7]

Answer:

a) 1,74 molal

b) 37,2 %

c) 0,03

Explanation:

We are going to define sucrose as solute, water as solvent and the mix of both, the solution.

Let´s start with the data:

$Molarity = M = \frac{1,22 mol solute}{lts solution}$

We can assume as a calculus base, 1 liter of solution. So, in 1 liter of solution we have 1,22 moles of solute:

$1 lts solution * \frac{1,22 moles solute}{lts solution}=1,22 moles solute$

Knowing that the molality (m) is defined as mol of solute/kgs solvent, we have to calculate the mass of solvent on the solution. Remember our calculus base (1 lts of solution). In 1 lts of solution we have 1120 grams of solution.

$1 lts solution * \frac{1,12 grs solution}{mL solution}*\frac{1000 mL solution}{1 lts solution} = 1120 grs of solution$

With the molecular weight of solute (<em>Sum of: for carbon = 12*12=144; for hydrogen = 1*22=22 and for oxygen = 16*11=176. Final result = 342 grs per mol</em>), we can obtain the mass of solute:

$1,22 mol solute*\frac{342 grs solute}{1 mol solute} = 417,24 grs solute$

Now, the mass of solvent is: mass solvent = mass of solution - mass of solute. So, we have: 1120 - 417,24 = 702,76 grs of solvent = 0,70276 Kgs of solvent

$molality = m = \frac{1,22 mol solute}{0,70276 kgs solvent}= 1,74 molal$

For b) question we have that the mass percent of solute is hte ratio between the mass of solute and the mass of solution. So,

$%(w/w) = \frac{417,24 grs solute}{1120 grs solution} = 37,2%$

For c) question we have that the mole fraction of solute is the ratio between moles of solute and moles of solution. Let's calculate the moles of solution as follows: <em>Moles solution = moles solute + moles solvent.</em> First we have that the moles of solvent are (remember that the molecular weight of water for this calculus is 18 grs per mol):

$702,76 grs solvent*\frac{1 mol solvent}{18 grs solvent} = 39,04 moles solvent$

So, we have the moles of solution: 1,22 moles of solute + 39,04 moles of solvent = 40,26 moles of solution

Finally, we have:

$Mol frac solute = \frac{1,22 mol solute}{40,26 mol solution}= 0,03$

6 0

3 years ago