in step 11 of the procedure, it is stated that the absorbance of the solution increases as fe3 solution is added? explain using equation 3 and lechatelier's principle.

True, According to Mendeleev's periodic table when atoms are arranged in increasing no. of atomic mass some properties recur periodically, which later changed to the modern periodic law.

According to the contemporary periodic law, an element's physical and chemical characteristics are periodic functions of its atomic number.

From left to right across each row, scientists organized elements in increasing order of their atomic numbers. and found that items with identical features recur at predictable periods.

Thus, according to modern periodic law when elements are arranged in increasing order of atomic no. certain physical and chemical processes. recur periodically.

True, According to Mendeleev's periodic table when atoms are arranged in increasing no. of atomic mass some properties recur periodically, which later changed to the modern periodic law.

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Answer:

6•02 ×1023 is 6158•46

Explanation:

do and search in calculator

Ag,Cu,Mg,S are the answers...............

Answer:

silver-Ag

copper-Cu

magnesium-Mg

sulphur-S

Explanation:

Answer:

The length of the log is 180 cm

Explanation:

From the question given above, the following data were obtained:

Time = 2 hours

Speed = 1.5 cm/min

Distance =?

Next, we shall convert 2 hours to minutes. This can be obtained as follow:

1 h = 60 mins

Therefore,

2 h = 2 × 60

2 h = 120 mins

Finally, we shall determine the Lenght of the log. This can be obtained as follow:

Time = 120 mins

Speed = 1.5 cm/min

Distance =?

Speed = distance / time

15 = distance / 120

Cross multiply

Distance = 1.5 × 120

Distance = 180 cm

Therefore, the length of the log is 180 cm

Answer:

180

Explanation:

The ion that does not have the same electron configuration as the noble gas neon is Mg+2.

The electron configuration of neon is 1s2 2s2 2p6, while the electron configuration of Mg+2 is 1s2 2s2 2p6, which is missing two electrons from the outermost shell, making it a different configuration.

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Explanation:

The nucleus of an atom is surround by electrons that occupy shells, or orbitals of varying energy levels. The ground state of an electron, the energy level it normally occupies, is the state of lowest energy for that electron. There is also a maximum energy that each electron can have and still be part of its atom.

Answer:

64g of \(\bold{CH_{3}OH}\dashrightarrow\)44.8L

vapour density of \(CH_{3}3OH=\frac{mass}{volume}\) of \(\bold{CH_{3}OH}\)

=64/44.8=10/7=1.43 g/l

Vapour density of \(\bold{CH_{3}OH}\)=1.43g/l

64g of \(\bold{CH_{3}OH => 44.8L }\)

vapour density of \(\small{\sf{CH_{3}3OH=\frac{mass}{volume} of } \bold{CH_{3}OH}}\)

=64/44.8=10/7=1.43 g/l

Vapour density of \(\bold{CH_{3}OH = 1.43 g/L}\)

A molecule's three-dimensional structure, with simple lines representing plane links, wedge-shaped lines representing bonds facing the observer, and dashed lines representing bonds Stereochemistry facing the viewer's opposite.

Stereochemistry is the study of a molecule's three-dimensional structure. The only structural difference between cis and trans isomers, which are types of stereoisomers, is where the molecule's elements are located three dimensionally. The chemical and physical properties of these stereoisomers may differ. Stereochemistry is a branch of chemistry concerned with "the study of the various spatial configurations of atoms in molecules." The systematic presentation of a specific area of science and technology, known as

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Answer:

Explanation:

The volume of a balloon is 30 L at 313K and a pressure of 153KPA What is the volume at 273K and 101.3kPa?

from PV=nRT we can derive

PV/T =P'V'/T' so

153X30/313 = 101.3 X V'/273

OR 153 X 30 X273/(313 X 101.3) =V'

V' = 39.5 L

The O-ring contains approximately 1.046 × 10^18 gold atoms. To calculate the number of gold atoms in the O-ring, we need to determine the volume of the wire and then use the density and atomic mass of gold to convert to the number of atoms. Here's the step-by-step calculation:

1. Calculate the volume of the wire:

  The wire can be considered as a cylinder. The radius (r) is half the diameter, so r = 0.75 mm = 0.75 × 10^(-3) m.

  The length (L) of the wire is given as 100 mm = 100 × 10^(-3) m.

  The volume (V) of the wire is given by the formula: V = πr^2L.

  Substituting the values, we get: V = π(0.75 × 10^(-3))^2(100 × 10^(-3)) = π(0.5625 × 10^(-6))(0.1) = 0.01767 × 10^(-6) m^3.

2. Calculate the mass of the wire:

  The density of gold (ρ) is approximately 19,300 kg/m^3.

  The mass (m) of the wire can be calculated using the formula: m = ρV.

  Substituting the values, we get: m = (19,300 kg/m^3)(0.01767 × 10^(-6) m^3) = 0.3423 × 10^(-3) kg.

3. Calculate the number of moles of gold:

  The molar mass (M) of gold is approximately 197.0 g/mol.

  The number of moles (n) of gold can be calculated using the formula: n = m/M.

  Substituting the values, we get: n = (0.3423 × 10^(-3) kg)/(197.0 g/mol) = 1.739 × 10^(-6) mol.

4. Calculate the Avogadro's number and the number of gold atoms:

  Avogadro's number (NA) is approximately 6.022 × 10^23 mol^(-1).

  The number of gold atoms (N) can be calculated using the formula: N = n × NA.

  Substituting the values, we get: N = (1.739 × 10^(-6) mol)(6.022 × 10^23 mol^(-1)) ≈ 1.046 × 10^18 gold atoms.

Therefore, the O-ring contains approximately 1.046 × 10^18 gold atoms.

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Answer:

Chlorine has more mass than the other elements.

Explanation:

We can find the mass of each element using the following equation:

\( m = \eta*A \)

Where:

η: is the moles

A: is the standard atomic weight

a) For carbon, we have:

\( m_{C} = \eta*A = 1 mol*12.011 g/mol = 12.011 g \)

b) For oxygen, we have:

\( m_{O} = 1 mol*15.999 g/mol = 15.999 g \)

c) For chlorine, we have:

\( m_{Cl} = 1 mol*35.45 g/mol = 35.45 g \)

d) And for For hydrogen, we have:

\( m_{H} = 1 mol*1.008 g/mol = 1.008 g \)

Therefore, chlorine has more mass than the other elements.  

I hope it helps you!          

Answer:

Nonmetals lose electrons to gain a negative charge and form anions, whereas metals lose electrons to gain a postive charge and form cations.

Atoms that gain or lose electrons are called ions and can have a negative charge or a postive charge.

Explanation:

The question is incomplete but i will try to offer as much help as i can.

Answer:

See explanation

Explanation:

The electron was discovered by J.J Thompson. His model of the atom was called the plum-pudding model of the atom.

He discovered that cathode rays being negatively charged particles were deflected by a magnet in just the same way as moving, negative electrically charged particles.

Similarly, in an electric field, they are deflected towards the positive plate of the electrostatic field which shows that they are negatively charged.

a) The explosiveness of hydrogen gas is a chemical property.

b) The bronze color of copper is a physical property.

c) The shiny appearance of silver is a physical property.

d) The ability of dry ice to sublime (change from solid directly to vapor) is a physical property.

Chemical properties are properties that describe the behavior of a substance during a chemical reaction or a chemical change. Explosiveness of hydrogen gas is an example of a chemical property because it describes how hydrogen gas reacts with oxygen to form water and how the reaction releases a large amount of energy in the form of an explosion.

Physical properties, on the other hand, are properties that describe the characteristics of a substance that can be observed or measured without changing the composition of the substance. Examples of physical properties include the color, texture, and melting point of a substance. The bronze color of copper and the shiny appearance of silver are both examples of physical properties.

The ability of dry ice to sublime (change from solid directly to vapor) is also a physical property because it describes a physical change that occurs when dry ice is heated or exposed to high pressure.

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Answer:

: Each has four valence electrons, but germanium will at a given temperature have more free electrons and a higher conductivity. Silicon is by far the more widely used semiconductor for electronics, partly because it can be used at much higher temperatures than germanium

Explanation:

have a great day

Answer:

First one

Explanation:

Because water molecules at the surface of the water puddle attract more to one other than they do to the air molecules above them

Answer:

Question 2:

Cohesion and adhesion

Water has forces of attraction between different molecules, so its molecules are locomotive.

Question 3:

Surface tension

It experiences a perpendicular force which keeps the area of the pepper on surface

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The partial pressure of helium in the mixture of noble gases is 0.22 atm.

To find the partial pressure of helium, we need to subtract the pressures of neon and argon from the total pressure of the mixture. Given that the total pressure is 1.25 atm, and the pressures exerted by neon and argon are 0.68 atm and 0.35 atm, respectively, we can calculate the partial pressure of helium as follows:

Partial pressure of helium = Total pressure - Pressure of neon - Pressure of argon

Partial pressure of helium = 1.25 atm - 0.68 atm - 0.35 atm

Partial pressure of helium = 0.22 atm

Therefore, the partial pressure of helium in the mixture is 0.22 atm.

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Answer:

C.) 4.85 x 10⁻¹⁹ J

Explanation:

To find the energy, you need to use the following equation:

E = hc / w

In this formula,

-----> E = energy (J)

-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)

-----> c = speed of light (3.00 x 10⁸ m/s)

-----> w = wavelength (m)

Once you have converted nanometers to meters, you can plug the given values into the equation and solve.

410 nm                1 m
-------------  x  ----------------------  =  4.10 x 10⁻⁷ m
                        1 x 10⁹ nm

E = hc / w

E = (6.626 x 10⁻³⁴ J*s)(3.00 x 10⁸ m/s) / (4.10 x 10⁻⁷ m)

E = 4.85 x 10⁻¹⁹ J

Answer:

The s orbital is lower in energy than the p orbital  

Explanation:

S-orbital electrons are simultaneously closer to the nucleus (more stable) and farther from the nucleus (less stable) compared to the corresponding p-orbitals. This makes them favorable to occupy when no p-electrons are present, but less favorable to occupy when p-electrons are present, which is why they are filled first but ionize first.

Answer:

i cant help yo with that

Explanation:

Sry

Answer:

Nope nowhere to be find

Explanation:

Lipids are more of a fatty, oily, and waxy substance that serve as long-term energy for whenever the body may need it. You can find lipids in oily foods such as salad dressing, olives, avocados, peanut butter, nuts, seeds, and some fish.

Proteins are enzymes that are used to strengthen and keep the body functioning. Proteins make up our bones, hair, skin, nails, and muscle, and without them our bodies wouldn't be strong enough to function or carry out even the simplest of tasks. Proteins are found in more animal-based foods such as meat, vegetables, grains, and seeds.

Carbohydrates are more of the sugary molecules that provide short-term or immediate energy for the body. They can be found in foods like bread, beans, milk, popcorn, potatoes, cookies, spaghetti, and soft drinks.

Answer: 2 AgNO3(aq) + NiCl2(aq) ⇒ 2 AgCl(s) + Ni(NO3)2 (aq)

Explanation:

a) The selectivity of a reaction is defined as the ratio of the rate of formation of the desired product to the sum of the rates of formation of all products. In this case, we have two parallel reactions: A ⟶ D and A ⟶ U. The selectivity (S) can be calculated as:

S = (rate of formation of D) / (rate of formation of D + rate of formation of U)

b) Manipulating the concentration of species A (CA) can affect the selectivity by altering the reaction rates of the individual pathways. By increasing or decreasing the concentration of A, we can favor one reaction pathway over the other, thereby increasing selectivity.

To justify this, let's consider the rate equations for the two reactions:

Rate of formation of D = k0 * CA

Rate of formation of U = k11 * CA

From the rate equations, it is clear that the rates of formation for both D and U are directly proportional to the concentration of A (CA). By increasing CA, both reaction rates will increase. However, the relative increase in the rate of the desired product (D) will be larger compared to the increase in the rate of the undesired product (U) if the rate constants (k0 and k11) are significantly different.

Thus, by manipulating the concentration of A, we can adjust the ratio of the reaction rates and bias the system towards the desired product, thereby increasing selectivity.

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Answer:

Modern science is typically divided into three major branches that consist of the natural sciences (biology, chemistry, physics, astronomy and Earth science), which study nature in the broadest sense; the social sciences (e.g. psychology, sociology, economics, history) which study people and societies; and the formal ...

Explanation:

The four major branches of science are, Mathematics and logic, biological science, physical science and social science. The first branch is mathematics & logic.