Based on these data, what is the value of the formation constant, Kf, of [Cu(NH3)4]2+? [Cu 2+ ]=6.47x10 -15 kf=

Answers

Answer 1

Answer: i dont even know to be honest

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Everything on earth is made of

Answers

- - Everything on earth is made of matter.Matter is all around you, everything you see and touch is matter.

Everything is made out of matter. More specifically atoms.

Explain the iodine clock reaction.

Answers

Iodine clock reaction is a combination of hydrogen peroxide and sulfuric acid. When these are poured together, there is no reaction at first, but after time, a colored reaction will happen to the liquid and may change back to the original color. This idea was discovered by Hans Landolt in the late 1800s.

Which one of the following elements does not exist as a diatomic molecule in nature? (a) hydrogen
(b) nitrogen
(c) fluorine
(d) neon

Answers

Neon
An easy way to remember the diatomic molecules is HOFBrINCl
almost sounds like hofbrinkle

Answer:

Neon, it is the answer on chem exam and it doesnt exist as a diatomic molecule

Which element has the greatest density at STP?(1) scandium (3) silicon
(2) selenium (4) sodium

Answers

Answer:

Selenium has the greatest density at STP.

Explanation:

According to Ideal gas equation,

P V = n R T

where;

n = m/M

Therefore,

P V = m R T / M

Rearranging,

P M = (m/V) R T

Also,

m/V = density = d

So,

P M = d R T

Solving for density,

d = P M / R T

According to this equation density is directly proportional to Molar mass of a substance. Hence, the Atomic masses of given compounds are listed below,

Scandium = 44.96 g.mol⁻¹

Selenium = 78.97 g.mol⁻¹

Silicon = 28.09 g.mol⁻¹

Sodium = 22.99 g.mol⁻¹

Therefore, selenium having the greatest Atomic Mass will have the greatest density. The densities of given elements are as follow;

Scandium = 2.98 g.cm⁻³

Selenium = 4.81 g.cm⁻³

Silicon = 2.33 g.cm⁻³

Sodium = 0.96 g.cm⁻³

$\boxed{\left( 2 \right){\text{ Selenium}}}$ has the greatest density at STP.

Further Explanation:

Ideal gas law is the equation of state for any hypothetical gas. The expression for the ideal gas equation is as follows:

${\text{PV}} = {\text{nRT}}$ …… (1)

Here,

P is the pressure.

V is the volume.

T is the absolute temperature.

n is the number of moles.

R is the universal gas constant.

The formula to calculate the number of moles is as follows:

${\text{n}}=\frac{{\text{m}}}{{\text{M}}}$ ...... (2)

Here,

n is the number of moles.

m is the mass.

M is the molar mass.

Substitute the value of n from equation (2) in equation (1).

${\text{PV}} = \frac{{{\text{mRT}}}}{{\text{M}}}$ …… (3)

Rearrange equation (3) as follows:

${\text{PM}} = \frac{{{\text{mRT}}}}{{\text{V}}}$ …… (4)

The formula to calculate density is as follows:

${\rho }} = \frac{{\text{m}}}{{\text{V}}}$ ...... (5)

Here,

${\rho }}$ is the density.

m is the mass.

V is the volume.

Substitute equation (5) in equation (4).

${\text{PM}} = \rho{\text{RT}}$ …… (6)

Rearrange equation (6) to calculate the density.

${\rho }} = \frac{{{\text{PM}}}}{{{\text{RT}}}}$ ...... (7)

At STP, T and P remain constant, R is already a constant. So according to equation (7), density of substance is directly proportional to the molar mass of the substance.

The molar mass of scandium is 44.96 g/mol.

The molar mass of selenium is 78.97 g/mol.

The molar mass of silicon is 28.09 g/mol.

The molar mass of sodium is 22.99 g/mol.

The molar mass of selenium is the highest among the given elements so its density will be the greatest.

Learn more:

1. Which statement is true for Boyle’s law: brainly.com/question/1158880

2. Calculation of volume of gas: brainly.com/question/3636135

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Ideal gas equation

Keywords: P, V, n, R, T, ideal gas, pressure, volume, selenium, sodium, scandium, silicon, 22.99 g/mol, 78.97 g/mol, 28.09 g/mol, 44.96 g/mol, density, molar mass.

Select all that apply.Hydraulic systems work because _____.
liquids are incompressible
pressure is transmitted equally throughout a liquid
gases are incompressible
pressure and force are the same thing

Answers

Answer;

Liquids are incompressible
Pressure is transmitted equally throughout a liquid

Explanation;

-Hydraulic systems works on the idea that, unlike gasses, liquids cannot be compressed. Therefore, a system that transfers pressure through liquid to aid in the lifting of an object can be created.

-Force that is applied at one point is transmitted to another point using an incompressible fluid. This force is created on the piston which generates or creates a pressure that will be transmitted equally to all parts of the system, then to the load and this pressure creates a force that will lift the load on the load piston.

because liquids are incompressible

Heated bricks or blocks of iron were used long ago to warm beds. A 1.49 -kg block of iron heated to 155 Celsius would release how many joules of heat as it cooled to 22 Celsius ?

Answers

Specific heat capacity= Quantity of heat/massxΔT
Shc of iron (constant)= 0.4494J/³C for 1g
1.49kg=1490g
Q=1490x(22-155)x0.4494
Q=89057.598J

Final answer:

The question pertains to the concept of specific heat capacity. Using the formula 'q = mcΔT' where 'q' is the heat transferred, 'm' is the mass of the substance, 'c' is the specific heat and 'ΔT' is the temperature change, we can calculate how much heat a block of iron would release when it cools.

Explanation:

To solve your question, we need to understand the concept of specific heat capacity, which is an intensive property that depends only on the type of substance absorbing or releasing heat. The specific heat capacity (c) of a substance, commonly called its "specific heat," is the quantity of heat required to raise the temperature of 1 gram of the substance by 1 degree Celsius. The specific heat of iron is :

0.449 J/g°C

To calculate the amount of heat released, we need to use the formula for heat transfer as follows: q = mcΔT where:

q is the heat transferred
m is the mass of the substance
c is the specific heat of the substance
ΔT is the change in temperature

In this case, the mass of iron is 1.49 kg or 1490 g, the specific heat capacity of iron is 0.449 J/g°C, and the change in temperature is 155°C - 22°C = 133°C.

By multipying these values in the formula we get: q = 1490g x 0.449 J/g°C x 133°C. Therefore, the block of iron would release calculated amount of Joules of heat as it cooled from 155°C to 22°C.

Learn more about specific heat capacity here:

brainly.com/question/28302909

#SPJ11

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