# If a system loses 250 kJ of heat at the same time that it is doing 500 kJ of wo Science Assignment Help

If a system loses 250 kJ of heat at the same time that it is doing 500 kJ of wo Science Assignment Help. If a system loses 250 kJ of heat at the same time that it is doing 500 kJ of wo Science Assignment Help.

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 If a system loses 250 kJ of heat at the same time that it is doing 500 kJ of work, what is the change in the internal energy of the system? (a) +250 kJ (b) -250 kJ (c) +750 kJ (d) -750 kJ

If a system loses 250 kJ of heat at the same time that it is doing 500 kJ of wo Science Assignment Help[supanova_question]

## The number of d-electrons in Fe2+ (Z = 26) is not equal to that of A. p-elect Science Assignment Help

The number of d-electrons in Fe2+ (Z = 26) is not equal to that of

 A. p-electrons in Ne(Z = 10) B. s-electrons in Mg(Z = 12) C. d-electrons in Fe(Z = 26) D. p-electrons in CI(Z = 17)

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## The number of moles of solute present in 1 kg of a solvent is called its A. mol Science Assignment Help

The number of moles of solute present in 1 kg of a solvent is called its

 A. molality B. molarity C. normality D. formality

[supanova_question]

## The most electronegative element among the following is A. sodium B. bromine Science Assignment Help

The most electronegative element among the following is

 A. sodium B. bromine C. fluorine D. oxygen

[supanova_question]

## The nucleus of an atom consists of A. electrons and neutrons B. electrons and p Science Assignment Help

The nucleus of an atom consists of

 A. electrons and neutrons B. electrons and protons C. protons and neutrons D. All of the above

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## The metal used to recover copper from a solution of copper sulphate is A. Na Science Assignment Help

The metal used to recover copper from a solution of copper sulphate is

 A. Na B. Ag C. Hg D. Fe

The metal used to recover copper from a solution of copper sulphate is A. Na Science Assignment Help[supanova_question]

## How many molecules are in 10.0 moles of H2O? Science Assignment Help

6.02 x 1022 molecules

6.02 x 1023 molecules

6.02 x 1024 molecules

1.8 x 1025 molecules

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## Select the correct net-ionic equation from for each of the reactions, in aqueo Science Assignment Help

Sn2+(aq) oxidizes Ni(s)

Co2+(aq) oxidizes Fe(s)

Ni2+(aq) oxidizes Cd(s)

Calculate the standard cell potential for

Ags | Ag+aq || Fe2+aq | Fes

if the standard electrode reduction potentials are

Ag+aq | Ags = 0.799 V Fe2+aq | Fes = -0.409 V

Zn + NiCl2 → ZnCl2 + Ni

Cl2 + H2O → H+ + Cl + HOCl

Cu(OH)2 + 2HCl → CuCl2 + 2H2

Ca+ 2HCl → CaCl2 + H2

H+ + HS → H2S

NiCl2

NaBr
AgNO3
HNO3
HBr

The Cu atom in CuSO4

The N atom in NO2
The P atom in PF5

The Fe atom in FeO

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## Nitrogenous base that occurs in RNA but not in DNA Science Assignment Help

Nitrogenous base that occurs in RNA but not in DNA

(A) Deoxyribose
(B) Ribose
(C) Uracil
(D) Cytosine
(E) Thymine

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## The half life period of an isotope is 2 hours. After 6 hours what fraction of th Science Assignment Help

The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?

 A. 1/6 B. 1/3 C. 1/8 D. 1/4

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If a system loses 250 kJ of heat at the same time that it is doing 500 kJ of wo Science Assignment Help

If a system loses 250 kJ of heat at the same time that it is doing 500 kJ of wo Science Assignment Help