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3 years ago

A student mixes two liquids together - 10 grams of alcohol and 25 grams of water. Which substance is the solute?

Chemistry

2 answers:

Sliva [168]3 years ago

7 0

Answer:

b. alcohol

Explanation:

Alcohol & water can mix together, and the solute is the choice that has the least amount (in this case, alcohol, with 15 grams less than water). The Solvent is the choice that has the most amount (in this case, water).

lana [24]3 years ago

6 0

The correct answer is B. The solute is the substance that can dissolve. So, alcohol is the solute.

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For dilute aqueous solutions in which the density of the solution is roughly equal to that of the pure solvent, the molarity of

EleoNora [17]

Explanation:

Given: Molarity = 0.01 M

Let the volume of the solution = 1 L

Hence, moles = 0.01 moles (Molarity*Volume)

Molar mass of urea = 60 g/mol

So, mass of urea = moles x molar mass = 0.01 moles x 60 g/mol = 0.6 g = 0.0006 kg ,

Given: Density of solvent = Density of solution = 1 Kg/liter (Water).

So,

The mass of solution = vol x density = 1 L x 1 kg/L= 1 kg

Also,

Mass of solution = Mass of solute + Mass of solvent

1 kg= 0.0006 kg + mass of solvent

Mass of solvent = 1-0.0006 = 0.9994 kg

Molality is the moles of solute present in 1 kg of the solvent. So,

Molaity = ( 0.01/0.9994) ≈ 0.01 m

Molarity = Molality

Hence proved.

3 0

4 years ago

Uranus is much larger than Earth, with a surface area of 8.10 × 1015m2 with an atmosphere of low-density gases: 82.5% H2, 15.2%

sdas [7]

Answer:

mass of Uranus: 9.31x10^22 kg

Explanation:

As I stated in the comments, the question in this problem is to calculate the mass of Uranus, given it's conditions.

Now, we have the data of the atmosphere gases, but for calculations, this data is irrelevant.

To calculate the mass of Uranus, we can use the second law of Newton which is:

F = m * a (1)

In this case, the only Force exerting here would be the weight so:

F = m * g (2)

And the force of Uranus, can also be expressed in terms of pressure and Area so:

F = P * S (3)

Now, if we replace (3) in (2) we have:

P * S = m * g

Solving for m:

m = P * S / g (4)

We have all the data, therefore, let's replace it in the above expression to calculate the mass of Uranus:

m = 1x10^8 * 8.1x10^15 / 8.7

m = 9.31x10^22 kg

This is the mass of Uranus

8 0

4 years ago

GasesToxic fumesParticulates are solid or liquid particles that settle after being dispersed in a gas.

lesantik [10]

I think the correct answer is the third option. Particulates are solid or liquid particles that settle after being dispersed in a gas. They are also termed as particle pollution or PM. It is a mixture of very small particles and liquid droplets which includes acids of nitrates and sulfates, organic substance, metals and dust particles.

6 0

3 years ago

Read 2 more answers

Help on my hw please

Reika [66]

Answer:

I think the answer is 2..

8 0

4 years ago

A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of m = 1.80 fg (where a femtogram

egoroff_w [7]

Answer:

Δx ≥ 1.22 *10^-10m

Explanation:

Step 1: Data given

The E. coli bacterial cell has a mass of 1.80 fg ( = 1.80 * 10^-15 grams = 1.80 * 10^-18 kg)

Velocity of v = 8.00 μm/s (= 8.00 * 10^-6 m/s)

Uncertainty in the velocity = 3.00 %

E. coli bacterial cells are around 1 μm = 10^−6 m in length

Step 2: Calculate uncertainty in velocity

Δv = 0.03 * 8*10^-6 m/s =2.4 * 10^-7 m/s

Step 3: Calculate the uncertainty of the position of the bacterium

According to Heisenberg uncertainty principle,

Δx *Δp ≥ h/4π

Δx *mΔv ≥ h/4π

with Δx = TO BE DETERMINED

with m = 1.8 *10^-18 kg

with Δv = 2.4*10^-7

with h = constant of planck = 6.626 *10^-34

Δx ≥ 6.626*10^-34 / (4π*(1.8*10^-18)(2.4*10^-7))

Δx ≥ 1.22 *10^-10m

6 0

3 years ago