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Mnenie [13.5K]
3 years ago
7

Where is energy stored in living sytems

Chemistry
1 answer:
EastWind [94]3 years ago
6 0

Answer:

energy is stored in the chemical bonds in molecules

Explanation:

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1. analyze the samples while they are frozen

stuff can react differently when it's colder

hope I could help good luck

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3 years ago
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NaOH is a strong base. Which two ions do you expect to find in a solution of NaOH?
Elena L [17]
NaOH will dissociate as Na+ and OH- in the solution.
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3 years ago
The switch is used to ___________ or __________ an electrical circuit. When the switch is on, the circuit is __________ , and wh
Pani-rosa [81]

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The switch is used to <u>disconnect</u> or <u>connect</u> an electrical circuit. When the switch is on, the circuit is <u>complete</u>, and when the switch is <u>off</u>, the circuit is open. Electrical current exists in the circuit when it is closed, but when it is open, there is no <u>electrical</u> current in the circuit. The switch determines whether the circuit is open and closed.

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2 years ago
0.820 L has a mass of 2.56kg what is the density of this liquid in kg/L
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8 0
3 years ago
It has been suggested that the surface melting of ice plays a role in enabling speed skaters to achieve peak performance. Carry
Fittoniya [83]

Answer:

a) Pf = 689.4 bar

b) P = 226.6 bar

c) T = 269.99 K

Explanation:

a)

The molar volume of ice is equal to:

Vi = m/p = (18.02x10^-3 kg H2O/1 mol H2O)*(1 m^3/920 kg) = 1.96x10^-5 m^3 mol^-1

The molar volume of liquid water is equal to:

Vl = (18.02x10^-3 kg/1 mol)*(1 m^3/997 kg) = 1.8x10^-5 m^3 mol^-1

The change in volume is equal to:

ΔVchange = Vi-Vl = 1.96x10^-5 - 1.8x10^-5 = 1.5x10^-6 m^3 mol^-1

using the Clapeyron equation:

Pf = Pi + ((ΔHf*ΔT)/(ΔVf*Ti)) = 1.013x10^5 Pa + ((6010 J mol^-1 * 4.7 K)/(1.5x10^-6 * 273.15 K)) = 6.89x10^7 Pa = 689.4 bar

b)

For the pressure we will use the equation:

P = (m*g)/A, where m is the mass, g is the acceleration of gravity and A is the area. Replacing values:

P = (79 kg * 9.81 m s^-2)/(1.9x10^-4 m * 0.18 m) = 2.26x10^7 Pa = 226.6 bar

c)

From Clapeyron´s expression we need to clear ΔT:

ΔT = ((Pf-Pi)*ΔV*Ti)/ΔHf = ((2.26x10^7 - 6.89x10^7)*1.5x10^-6*273.15)/6010 = -3.16 K

you can evaluate the new melting point of ice:

T = Ti + ΔT = 273.15 K - 3.16 K = 269.99 K

4 0
3 years ago
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