CHEMISTRY COLLEGE

Whose measurements are more precise?20.3 cm and 21.0cm

Answers

Answer 1

Answer:

Answer:

will i think the 21.0cm

Answer 2

Answer: 20.3 because it isn’t rounded

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A concentration cell is constructed using two Ni electrodes with Ni2+ concentrations of 1.0 M and 1.00 � 10�4 M in the two half-cells. The reduction potential of Ni2+ is �0.23 V. Calculate the potential of the cell at 25�C if the more dilute Ni2+ solution is in the anode compartment.

Answers

Answer: The cell potential of the cell is +0.118 V

Explanation:

The half reactions for the cell is:

Oxidation half reaction (anode): $Ni(s)\rightarrow Ni^(2+)+2e^-$

Reduction half reaction (cathode): $Ni^(2+)+2e^-\rightarrow Ni(s)$

In this case, the cathode and anode both are same. So, $E^o_(cell)$ will be equal to zero.

To calculate cell potential of the cell, we use the equation given by Nernst, which is:

$E_(cell)=E^o_(cell)-(0.0592)/(n)\log ([Ni^(2+)_(diluted)])/([Ni^(2+)_(concentrated)])$

where,

n = number of electrons in oxidation-reduction reaction = 2

$E_(cell)$ = ?

$[Ni^(2+)_(diluted)]$ = $1.00* 10^(-4)M$

$[Ni^(2+)_(concentrated)]$ = 1.0 M

Putting values in above equation, we get:

$E_(cell)=0-(0.0592)/(2)\log (1.00* 10^(-4)M)/(1.0M)$

$E_(cell)=0.118V$

Hence, the cell potential of the cell is +0.118 V

The cell potential for the cell as calculated is 0.118 V.

What is the Nernst equation?

The Nernst equation can be used to obtain the cell potential of a cell under non- standard conditions. The standard cell potential in this case is zero owing to the fact that both cathode and anode are made of nickel.

Hence;

Ecell = E°cell - 0.0592/nlog Q

Ecell = 0 - 0.0592/2 log (1 00 * 10^-4/1)

Ecell = 0.118 V

The cell potential for the cell as calculated is 0.118 V.

Learn more about Nernst equation: brainly.com/question/721749

How many grams of CuSO4 5 H20 are needed to make 1 liter of a 2% (w/v) CuSO4. REPORT TO THE NEAREST 1/10 G.

Answers

Answer:

19.9 grams of $CuSO_4.5H_2O$ will be needed.

Explanation:

Required strength of the solution = 2% (w/v)

This means that 2 gram of solute in 100 ml of solution.

Mass of $CuSO_4.5H_2O$ = 2 g

Moles of $CuSO_4.5H_2O$ = $(2 g)/(249.68 g/mol)=0.008010 mol$

Volume of the solution = 100 mL = 0.1 L

Molarity of the solution:

$M=(0.008010 mol)/(0.1 L)=0.08010 mol/L$

0.08010 moles of $CuSO_4.5H_2O$ are present 1 l of the solution.

Then mass of 0.08010 moles of $CuSO_4.H_2O$ will be:

0.08010 mol × 249.68 g/mol = 19.9993 g≈ 19.9 g

19.9 grams of $CuSO_4.5H_2O$ will be needed.

2Identify at least two factors which influence
periodic poperties of elements in groups
and periods

Answers

atomic radius

ionization potential

Atomic radius and Ionization Energy

How is the combined gas law modified to form the ideal gas law?A) each side of the equations is divided by the number of moles
B) the temperature of the gas is stipulated to be absolute zero
C) each side of the equation is multiplied by air pressure at sea level
D) the volume of each gas particle is added to the equation

Answers

The answer is A) each side of the equations is divided by the number of moles.
The combined gas law equation
P1V1/T1 = P2V2/T2
becomes
P1V1/n1T1 = P2V2/n2T2
with the addition of Avogadro's law relating volume and number of moles of a gas.This modification is when the number of moles of gas in a sample is allowed to change in addition to pressure, temperature and volume. This also means that pressure multiplied by the volume and divided by the product of the number of moles and temperature is a constant:
PV/nT = constant
which if written in the form PV = nRT is the ideal gas law equation where R is the gas constant.

Answer:

A) each side of the equations is divided by the number of moles

Explanation:

PSYCHOLOGYWhich of the following statements is not correct concerning the relationship between attention and perception? Focusing one’s attention on something in the environment is necessary in order to perceive it. Individuals have the ability to focus attention on a specific stimulus in the midst of surrounding activity. Whether or not people perceive information as meaningful influences their attention to it. Individuals can easily detect changes in the environment when they are absorbed in a task.

Answers

The statements is not correct concerning the relationship between attention and perception is that individuals can easily detect changes in the environment when they are absorbed in a task.

What is psychology?

Psychology is defined as the scientific discipline that studies mental state and processes and behavior in human and other animals.

It can also be defined as the scientific study of mind and behavior.

Environment is defined as the sum total of all the living and non living elements and there effect that influences human life.

Thus, the statements is not correct concerning the relationship between attention and perception is that individuals can easily detect changes in the environment when they are absorbed in a task.

To learn more about psychology, refer to the link below:

brainly.com/question/10980588?

#SPJ2

Answer:

The answer is Individuals can easily detect changes in the environment when they are absorbed in a task.

Explanation:

Which of the following combinations represents an element with a net charge of +1 with a mass number of 75?a) 35 (o), 35 (+), 34 (-)b) 40 (o), 40 (+), 39 (-)c) 40 (o), 35 (+), 34 (-)d) 37 (o), 38 (+), 34 (-)e) 40 (o), 35 (+), 35 (-)

Answers

Answer:

c) 40 (o), 35 (+), 34 (-)

Explanation:

Let us represent the element with P

Given information about the element:

Charge on P = +1

Mass number of P = 75

We can express the atom as ⁴⁵P¹⁺

The positive charge on the atom denotes that the atom has lost an electron. Electrons are negatively charge elementary particles in an atom. Therefore, the number of protons, positively charged particles are now more. This charge imbalance is what leaves atom P with a charge of +1. The difference between the proton number and number of electrons is just 1 and it represents a loss of an electron. Atoms that are not charged have their proton and electron number to be the same. Those that are negatively charge signifies that an electron has been gained and the number of electrons are greater than those of the protons.

The mass number 75 is the number of protons plus neutrons.

Option C gives the following information:

Neutron = 40

Protons = 35

Electrons = 34

Here Protons > Electrons with a difference of 1+.

Mass number = Protons + Neutrons =35 + 40 = 75

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A sample of phosgene gas at an initial concentration of 0.500 m is heated at 527 °c in a reaction vessel. at equilibrium, the concentration of co (g) was found to be 0.046 m. calculate the equilibrium constant for the reaction at 527 °c.

A sample of chlorine gas initially having a volume of 35.6 L was found to have a volume of 27.2 L at 15.6 atm. What was the initial gas pressure (in atm)? Assume constant temperature.