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3 years ago

What is the initial temperature (in Celsius) of a 675 ml balloon if the

Chemistry

1 answer:

RoseWind [281]3 years ago

7 0

Answer: 127 (3.s.f)

Explanation:

Boyle's law states that Volume x pressure = constant

Therefore let's first find the constant: 45 x 1900 = 85500

Then lets plug 675 ml and 85500 into the equation above:

675 x C = 85500

C = 127 (3 s.f.)

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Late nite lab pH indicator

olasank [31]

Litmus paper maybe? There are a bunch of things you can use for this, but high school chem teachers love their litmus paper

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4 years ago

What element in the second period has the largest atomic radius?

pshichka [43]

The correct option is D.
The elements in the second period are lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine and neon. In the second period, the atomic radius of the elements decreases across the period, thus lithium has the highest atomic radius of 152 picometer while neon has the least [67 picometer].

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3 years ago

All of the stars in the sky, except for one, are so far away that they look like small points of light.

kiruha [24]

Answer:

The sun.

Explanation:

It is closer to Earth, therefore bigger to us, and not just a small point of light.

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3 years ago

Consider the diagram above. If you placed a rubber duck on the

Juliette [100K]

Answer:

But there is nothing above

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3 years ago

Which of the following best helps to why the value of Delta H degree for the CaF_2 in water in positive? A. CaF_2(s) is insolubl

FromTheMoon [43]

Answer: Option (C) is the correct answer.

Explanation:

A positive value of enthalpy or $\Delta H$ means that energy is being absorbed from the surrounding. As $CaF_{2}$ has strong ionic bonding between both calcium and fluorine atoms. So, to break their bond we need to provide energy to it.

So, when $CaF_{2}$ is dissolved in warm water then warm water molecules will bombard with the stable bond of $CaF_{2}$ . As a result, the energy will transfer from water to the bond in order to break it. And, due to loss in internal energy then there will be consequent lowering of temperature.

When this bond is broken down then the atoms will separates into gaseous ions and these ions will be then surrounded by the water molecules. As ithe bond between $CaF_{2}$ is very strong hence, its lattice energy will be very high.

Thus, we can conclude that the statement $Ca^{2+}$ ions have very strong interactions with $F^{-}$ ions in the crystal lattice, best helps to why the value of $\Delta H$ degree for the $CaF_{2}$ in water in positive.

7 0

3 years ago