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MatroZZZ [7]
3 years ago
7

Nolan and Hunter are studying heat flow, so they design the following apparatus. The apparatus consists of two identical glass c

ylinders connected by a glass tube. During their experiment, Nolan and Hunter simultaneously pour hot water in the tank on the left and cold water in the tank on the right. Then, they seal the tops of the cylinders and allow the water in the tanks to intermingle through the glass tube. To determine if heat is transferred, Nolan wants to place his hands in each tank of water at the beginning and end of the experiment. Hunter wants to use a thermometer to measure the temperature in each tank at the beginning and end of the experiment. How do Nolan and Hunter's proposed methods compare?
Chemistry
2 answers:
maks197457 [2]3 years ago
8 0

Nolan's method would allow him to make a descriptive observation. Hunter's method would allow him to include numbers in his data.


irinina [24]3 years ago
5 0

Nolan's method would allow him to make a descriptive observation. Hunter's method would allow him to include numbers in his data. just had this question ;)

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Why is density referred to as a characteristic property of matter?
amm1812

Answer : Density of any particular matter remains the same at any concentration at any weight.


Density does not varies with the concentration. The formula for density is mass / volume.


So if the mass changes the density will change accordingly, also if the volume changes the density will get changed.


because, of the above reasons density is referred as a characteristic property of matter.

6 0
3 years ago
What is the pH of pure water at 40.0°C if the Kw at this temperature is 2.92 - 10-147 OA) 6.767 O B) 0 465 O c) 7.000 OD) 7 233
Sergeeva-Olga [200]

Answer:

PH= 6.767     (answer is the A option)

Explanation:

first we need to correct the value in Kw at this temperature is 2.92*10^-14

so, in this case we have that:

Kw=2.92*10^-14 M²

[ H3O^+] [ H3O^+]

[H_{3}O^{+}  ] [OH^{-}  ] = Kw = 2.92*10^{-14} M^{2}   \\\\

at 40ºC

[H_{3}O^{+}  ] = [OH^{-}  ]

[H_{3}O^{+}  ]^{2} = 2.92*10^{-14} M^{2}

[H_{3}O^{+}  ] = (2.92*10^{-14})^{1/2} = 1.71*10^{-7} M

PH= -log10[H_{3}O^{+}  ] = -log10(1.71*10^{-7} ) = 6.767

7 0
2 years ago
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When lithium reacts to chlorine it goes from having no charge to +1 charge, while chlorine goes from neutral to having -1 charge.
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