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MaRussiya [10]
3 years ago
9

Jill graphs the speed of a model train that is travelling at a speed of 15 kilometers per hour. Which graph shows the speed of t

he model train?

Chemistry
1 answer:
Tasya [4]3 years ago
8 0

Answer:c

Explanation:

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To interconvert the concentration units molality (m) and mass percent, you must also know the density of the solution. A) True B
uranmaximum [27]

Answer:

The correct answer is option false.

Explanation:

Molality of the solution defined as moles of substance present in 1 kilogram of   solvent.

Moles = \frac{Mass of solute}}{\text{molar mass of solute}}

Molality=\frac{Moles}{\text{Mass of solvent(kg)}}

Mass of percent (w/w%) of the solution is defined as amount of solute present in 100 grams of solution.

(w/w\%)_=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 100

So, if want to inter-convert molality into mass percent we can do that without knowing density of solution.

Mass of solution = Mass of solute + Mass of solvent

7 0
3 years ago
Which statements describe density? Check all that apply.
MrRa [10]

I think is 5  because you use density is found by mass divide by volume.

8 0
3 years ago
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Do you think this wing is from the left side or the right side of the chicken's body? Explain your answer.
lakkis [162]

Answer:

si

Explanation:

aveces

4 0
2 years ago
calculate the amount of heat energy required to evaporate 25.7g of water at 100 degrees celcius. (Molar heat of vaporization of
Vikentia [17]

Answer:

5.82 ×10⁴ j

Explanation:

Given data:

Mass of water = 25.7 g

Amount of heat to evaporate it = ?

Molar heat of vaporization = 4.07×10⁴ j/mol

Solution:

First of all we will calculate the number of moles of water.

Number of moles = mass/ molar mass

Number of moles = 25.7 g/ 18 g/mol

Number of moles = 1.43 mol

Energy needed for one mole is 4.07×10⁴ j.

For 1.43 mol:

1.43 mol × 4.07×10⁴ j/ 1mol

5.82 ×10⁴ j

8 0
3 years ago
How does a compound differ from a mixture?
Debora [2.8K]

Answer:

In a mixture, each substance is still the same and don't really combine. In a compound, the substances are chemically combined (so the substances that went in have technically changed).

Explanation:

5 0
3 years ago
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