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Free_Kalibri [48]
3 years ago
14

A device that does work in a circuit is called what ?

Chemistry
2 answers:
zavuch27 [327]3 years ago
7 0
These are called resistors. 
Len [333]3 years ago
7 0
Those are called resistors
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4. The concentration of both molecules in the starting mixture, prior to separation, is 1 mM. What is the amount (in mass units
viva [34]

Answer:

Hi there, the question here is not complete. Not to worry there will be in step by step guild in the explanation section that will help you in solving similar question.

Explanation:

So, an important information that should have been given in this question is the same of each of molecules in the mixture or even the name or identity of the mixture.

Nonetheless, the molarity if the mixture is given to be 1mM and the volume of the mixture is given to be 200L.

Therefore, the first thing to do is to determine the number of moles of each molecules in the mixture. After that the mad of each molecules can be determined using the number of moles gotten.

Thus, 1 mM = 0.001 M. Therefore, the number of moles of the molecules in the mixture can be calculated by using the formula below:

Number of moles = molarity × Volume = 0.001 × 200 = 0.2 mol.

Hence the mass of each Molecules can be calculated by using the formula below;

Number of moles = Mass/ molar mass.

That's mass = number of moles × molar mass of each molecules.

Assuming the molecules in the mixture are A and B and the respective molar mass of A and B are x g/mol and y g/mol. We will have;

The mass of A = 0.2 moles × x g/mol.

The mass of B = 0.2 moles × y g/mol.

5 0
3 years ago
How many moles are in 1.5x1023 molecules of Na2SO4?
german
One mole of Na2SO4 is 6.022 * 10^(23) molecules. We can divide this into the quantity in the question to find a value of 1.5/6.022 = 0.2491 moles. Rounded to two significant figures and put in scientific notation, we can rewrite this quantity as 2.5 * 10^(-1) moles
6 0
2 years ago
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The ballon will be attracted to the rod.
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Which type of decay has the greatest mass?
iVinArrow [24]

The type of decay which has the greatest mass is the alpha decay. An unstable nucleus loses the most mass if the nucleus emits an alpha particle. This type of decay has the largest mass among the radioactive decay. When this particle is emitted from a nucleus, it loses two protons and two neutrons therefore large amount of mass is lost.

6 0
4 years ago
Consider the following system at equilibrium where H° = 16.1 kJ, and Kc = 6.50×10-3, at 298 K. 2NOBr(g) 2NO(g) + Br2(g)If the VO
Norma-Jean [14]

Answer:

1) The value of Kc : (C.) remains the same

2) The value of Qc : (A.) is greater than Kc

3) The reaction must : (B.) run in the reverse direction to reestablish equilibrium.

4) The number of moles of Br2 will : (B.) decrease

Explanation:

Value of concentration equilibrium constant Kc depends only on temperature. Since temperature remains constant, therefore, Kc remains constant.  Decrease in volume means increase in pressure. Increase in pressure favors the side with less gaseous species.  Hence, increase in pressure will favor the reverse reaction towards reactants.

7 0
3 years ago
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