3 years ago

Two different isotopes of the same element have : (true/false)

Chemistry

1 answer:

Alchen [17]3 years ago

8 0

Equal mass of an atom

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3 years ago

A gas has an initial volume of 455 mL at 105ºC and a final volume of 235 mL. What is its final temperature in Celsius degrees?

Oksana_A [137]

Hello!

To solve this problem we're going to use the Charles' Law. This Law describes the relationship between Volume and Temperature in an ideal gas. Applying this law we have the following equation:

$\frac{V1}{T1} = \frac{V2}{T2} \\ \\ T2= \frac{V2*T1}{V1}= \frac{235 mL * 105 ^{\circ}C }{455 mL}=54,23 ^{\circ}C$

So, the final temperature is 54,23 °C

Have a nice day!

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4 years ago

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A physical change _____ change the composition or identity of the substance. will will not 2. An example of a physical change is

Sav [38]

Answer:

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Explanation:

a physical change (can)change.,....

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4 years ago

Write the formula for the polyatomic ion in KOH. Express as an ion..

Bad White [126]

KOH is a compound containing two ions, K+ and OH-.
The polyatomic ion present is OH- which is called hydroxide. 
The compound is named potassium hydroxide.

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3 years ago

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3. What do you notice about the temperature of the substance in the test tube after it is placed in the beaker of water?

34kurt

Answer:

C: The temperature of the substance increases as it sits in the beaker of water

Explanation:

This question was taken from a video where an attempt was made to investigate the changes in temperature when a substance undergoes change from it's solid phase to its liquid phase.

To do this, as seen in the video online, it shows a solid substance in a test tube being placed in a beaker of water.

From observation, the water in the beaker has a warmer temperature than the solid substance present in the test tube and this in turn makes the test tube gradually increase in temperature.

Thus, the solid substance will as well increase increase in temperature when it is placed in the beaker of water.

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3 years ago