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Arturiano [62]
4 years ago
6

Which invention has done the most to help predict weather and warn people of approaching storms?

Chemistry
1 answer:
MariettaO [177]4 years ago
3 0
The wind vane, the rain gauge, the anemometer, the barometer, and the thermometer.
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Rocks are solids composed of one or more minerals true or false
Yuki888 [10]
The answer is true
:)
8 0
3 years ago
What is ΔG for the reaction at body temperature (37.0 °C) if the concentration of A is 1.6 M and the concentration of B is 0.50
Galina-37 [17]

Answer:

The Gibbs free energy is -2997.83 kJ mol-1.

Explanation:

The change in Gibbs free energy of the reaction \Delta G can be calculated using the formula.

\Delta G = -RTlnK

WHere R = Gas constant = 8.314KJ/Kmol

T = the temperature of the reaction in Kelvin = (37.0 + 273) = 310K

K = Raio of molar concentration of the two reactants = 1.6/0.5 = 3.2

Therefore,

\Delta G = -8.314 \times 310 \times  ln (3.2) = -2997.83 kJ mol-1

Therefore the Gibbs free energy is -2997.83 kJ mol-1.

The negative sign indicates that the reaction is spontaneous.

4 0
3 years ago
Julie is searching for cookware which is safe for all food preparation techniques, which of the following would best fit her nee
e-lub [12.9K]
ANSWER:
Your best go is C

EXPLANATION:
Metal is used as a utensil all around the world, c would be your best.
5 0
3 years ago
Explain the difference between a physical separation and a chemical separation
Gnom [1K]

A chemical separation is a separation method that involves change in the chemical composition of one of the solutions that are to be separated in order to a new physical properties of one part reached leaving the rest alone.


For example, When we add a chemical to the solution that will precipitate only one part of the solution leaving the rest.


A physical separation is a separation in which solutions are separated on the basis of their physical properties.


For example, If we use physical separation method in separating two oils with different specific volumes then these two oils are separated on the basis of their settling.

6 0
3 years ago
A galvanic cell at a temperature of 42 degrees Celcius is powered by the following redox reaction:
Dafna1 [17]

<u>Answer:</u> The cell voltage of the given cell is 2.01

<u>Explanation:</u>

The given chemical cell equation follows:

3Cu^{2+}(aq.)+2Al(s)\rightarrow 3Cu(s)+2Al^{3+}(aq.)

<u>Oxidation half reaction:</u> 2Al(s)\rightarrow 2Al^{3+}(aq,1.63M)+3e^-;E^o_{Al^{3+}/Al}=-1.66V       ( × 2)

<u>Reduction half reaction:</u> 3Cu^{2+}(aq,3.43M)+2e^-\rightarrow 3Cu(s);E^o_{Cu^{2+}/Cu}=0.34V      ( × 3)

Oxidation reaction occurs at anode and reduction reaction occurs at cathode.

To calculate the E^o_{cell} of the reaction, we use the equation:

E^o_{cell}=E^o_{cathode}-E^o_{anode}

Putting values in above equation, we get:

E^o_{cell}=0.34-(-1.66)=2.00V

To calculate the EMF of the cell, we use the Nernst equation, which is:

E_{cell}=E^o_{cell}-\frac{2.303RT}{nF}\log \frac{[Al^{3+}]^2}{[Cu^{2+}]^3}

where,

E_{cell} = electrode potential of the cell = ? V

E^o_{cell} = standard electrode potential of the cell = +2.00 V

R = Gas constant = 8.314 J/mol.K

T = temperature = 42^oC=[42+273]K=315K

F = Faraday's constant = 96500

n = number of electrons exchanged = 6

[Cu^{2+}]=3.43M

[Al^{3+}]=1.63M

Putting values in above equation, we get:

E_{cell}=2.00-\frac{2.303\times 8.314\times 315}{6\times 96500}\times \log(\frac{(1.63)^2}{(3.43)^3})

E_{cell}=2.01

Hence, the cell voltage of the given cell is 2.01

5 0
3 years ago
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