Iron (Fe): [Ar]4s23d6
longhand notation
noble-gas notation

The cultures of prehistoric humans are primarily known through the excavation of stone tools and other durable artifacts, such as the Oldowan and Acheulian tool traditions.

Stone tools and imperishable artifacts serve as key archaeological evidence for understanding prehistoric cultures. Through meticulous excavation and analysis, archaeologists have been able to piece together the lifestyles, technological advancements, and social behaviors of early human societies. The term "paleolithic" refers to the Old Stone Age, a time when humans relied on stone tools as their primary implements.

The Oldowan tool tradition is considered the earliest stone tool industry, dating back around 2.6 million years ago. It is characterized by simple tools, such as choppers and scrapers, which were crafted by flaking off pieces from larger stones. These tools were primarily used for basic activities like butchering and processing animal carcasses.

Later, the Acheulian tool tradition emerged around 1.76 million years ago, representing an advancement in stone tool technology. Acheulian tools, such as handaxes and cleavers, were more refined and standardized, showcasing an increased level of sophistication in tool-making techniques. These tools served a wide range of purposes, including hunting, woodworking, and shaping raw materials.

By studying the Oldowan and Acheulian tool traditions, researchers gain valuable insights into the cognitive abilities, cultural development, and technological progress of early humans. The examination of these artifacts provides evidence of their adaptability, problem-solving skills, and the gradual refinement of their tool-making techniques over time.

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Answer:

good times

Explanation:

always nedded

Here the nuclear decay of phosphorous to give S-32 is an example of beta-decay. Hence, the emitted particle is an electron. Thus, option b is correct.

The heavy unstable radioactive isotopes undergo nuclear decay by the emission of alpha or beta particle. Thus, there are mostly two types of decays, alpha decay and beta decay.

In alpha decay, the isotope emits a helium nuclei. Hence, mass number decreases by 4 units and atomic number decreases by 2 units. In beta decay, mass number does not change but atomic number increases by 1.

Here, P-32 undergo beta -decay by emitting an electron to form S -32. Hence, atomic number is increased by one. Therefore, the mission product is an electron option b.

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Answer:

(1) Acid -------------------------------------> (G) When dissolved in water, its solution has a pH value less than 7. Acids are proton (H⁺ ion) donors.

(2) Alkali -----------------------------------> (E) The oxide, hydroxide, or carbonate of a metal that will react with an acid, forming a salt as one of the products (if a base dissolves in water it is called an alkali. Bases are proton (H⁺ ion) acceptors.

(3) Base ------------------------------------> (I) Its solution has a pH value of more than 7.

(4) Blast furnace ------------------------> (C) The huge reaction vessels used in industry to extract iron from its ore.

(5) Displacement reaction ----------> (R) A reaction in which a more reactive element takes the place of a less reactive element in one of its compounds or in solution.

(6) Mole -----------------------------------> (A) A very large number that is the amount of substance in the relative atomic or formula mass of a substance.

(7) Neutral -------------------------------> (J) A solution with a pH value of 7 which is neither acidic nor alkaline. Alternatively, something that carries no overall charge.

(8) Neutralization ----------------------> (F) The chemical reaction of an acid with a base in which a salt and water are formed. If the base is a carbonate of hydrogen carbonate, carbon dioxide is also produced in the reaction.

(9) Ore -------------------------------------> (P) Ore is rock which contains enough metal to make it economically worthwhile to extract the metal.

(10) Oxidation --------------------------> (B) A reaction where oxygen is added to a substance / or when electrons are lost from a substance.

(11) pH -------------------------------------> (O) A number which shows how strongly acidic or alkaline a solution is.

(12) Pipette ------------------------------> (N) A glass tube used to measure accurate volumes of liquids.

(13) Precipitate -------------------------> (K) An insoluble solid formed by a reaction taking place in solution.

(14) Reactant ---------------------------> (M) A substance we start with before a chemical reaction takes place.

(15) Reduction -------------------------> (S) A reaction in which oxygen is removed or electrons are gained.

(16) Salt ----------------------------------> (Q) A salt is a compound formed when some or all of the hydrogen in an acid is replaced by a metal.

(17) Strong acids ---------------------> (L) These acids completely ionize in solution and have a high concentration of H⁺ (aq) ions in solution.

(18) Universal indicator ------------> (H) A mixture of indicators that can change through a range of colors to show how strongly acidic or alkaline liquids and solutions are.

(19) Weak acids ---------------------->  (D) Acids that do not ionize completely in aqueous solutions.

As a result, 1.5 moles of glycerol absorb about 1.99 Joules of heat when their temperature rises from 25 to 70 degrees Celsius.

Glycerin is a straightforward polymer. The molecular formula of this solvent is C3H8O3. It is sometimes referred to as glycerine or glycerol.

We can use the following formula to determine how much heat 1.5 moles of glycerol absorbed: q = n × C × ΔT

Glycerol has a specific heat capacity of 2.43 J/g°C. This needs to be divided by the molar mass of glycerol in order to be converted to Joules per mole per degree Celsius:

C = (2.43 J/g°C) / (92.09 g/mol)

C = 0.0264 J/mol°C

The change in temperature can then be calculated as follows:

ΔT = (70°C - 25°C) = 45°C

We can now enter the values into the formula as follows:

q = (1.5 mol) × (0.0264 J/mol°C) × (45°C)

q = 1.99 J

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Answer:

sesimographs

Explanation:

Answer:

A seismometer

Explanation:

it measures seismic waves

Answer: D and A

Explanation: D cuz you need water to have good soil and A cuz you get better soil if its warm. (:  ( 'u' ) ( 'U' )

Answer:

In general, the magnetic field is strongest close to the wire and weaker farther away. In fact, the magnetic field weakens as 1/r1/r where rr is the distance from the wire. This can change a bit depending on the length and shape of the wire. Far enough away, the magnetic field decays as 1/r21/r2 .

Answer:

Closest to the wire

Explanation:

In general, the magnetic field is strongest close to the wire and weaker farther away. In fact, the magnetic field weakens as where is the distance from the wire. This can change a bit depending on the length and shape of the wire.

Answer:

Explanation:

they both break down the earth

Answer:

they all have something to do with the creation of sedimentary rock

Explanation:

In order for us to have water to drink, it first needs to go through a process called the water cycle. And in that water cycle there’s a process called evaporation. Evaporation is the process by which water changes from a liquid to a gas. In order for it to rain we need clouds and clouds are made of water.  The water is heated  causing water molecules to convert into gas, that gas then goes through a process called condensation creating clouds. At some point those clouds will be full of water, and all that water will then cause the cloud to release the water molecules causing rain.

The water cycle shows the continuous movement of water within the Earth and atmosphere. It is a complex system that includes many different processes.

There are four main parts to the water cycle:

Evaporation, Convection, Precipitation and Collection.

Evaporation is when the sun heats up water in rivers or lakes or the ocean and turns it into vapor or steam.

The water vapor or steam leaves the river, lake or ocean and goes into the air.

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Hello! :)

\(\large\boxed{1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}}\)

Chlorine is a halogen located in group 7A and period 3 of the periodic table.

We can write the electron configuration of this element. Since it is in period 3, the highest configuration level will be at 3.

Chlorine is also located in the p block (nonmetal) section of the table, so the final part of the written configuration will involve "3p".

Recall that:

S block: up to 2 electrons

P block: up to 6 electrons

Chlorine has 17 electrons

Fill in the order of s block to p block. The first level only goes up to an s block. The configuration should sum up to 17 total electrons in total.

We can write the configuration as:

\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}\)

Answer:

renewable energy sources such as solar and wind DONT emit carbon dioxide and other greenhouse gases that contribute to global warming

Explanation:

Answer:

\(\huge\boxed{\sf v = 62.7 \ L}\)

Explanation:

Given Data:

Mole = n = 3.38 mol

Temp = t = 269 K

Pressure = 1.19 atm

Gas constant = R = 0.08206 L atm K⁻¹ mol⁻¹

Required:

Volume = v = ?

Formula:

Pv = nRT

Solution:

Rearranging formula

\(\displaystyle v = \frac{nRT}{P} \\\\v = \frac{(3.38)(0.08206)(269)}{1.19} \\\\v = \frac{74.6}{1.19} \\\\v = 62.7 \ L\\\\\rule[225]{225}{2}\)

Heat energy needed : 3.5 x 10⁷ kJ

Heat is a form of energy that can flow from high-temperature objects to low-temperature objects.

So heat moves when there is a difference in temperature and can increase or decrease the temperature. An object that receives a lot of heat will cause a large increase in temperature

The amount of heat is influenced by the mass of the object and the difference in temperature

Can be formulated

Q = m.c.Δt

Q: heat received or removed by an object (J)

m: object mass (kg)

c: heat type substance (J / kg⁰C)

ΔT: temperature change (⁰C)

210 kJ of heat energy is used to form 3.0 moles of Hydrogen, so heat energy for 1 mol Hydrogen :

\(\tt \dfrac{210}{3}=70~kJ/mol\)

mol of 1000 kg of Hydrogen=10⁶ g(MW=2 g/mol)

\(\tt \dfrac{10^6~g}{2}=5.10^5\)

The heat energy :

\(\tt 70~kJ/mol\times 5.10^5~mol=3.5\times 10^7~kJ\)

Answer:

All of the above

Explanation:

The reaction which happens inside the beaker is given by

∆represents heat

The reaction is an exothermic reaction and it releases heat to the surroundings

Answer:

Wavelength = \(4.48*10^{-5}m\)

Explanation:

Given the following data;

Speed of light, V = 3 * 10^{8}m/s

Frequency, F = 6.700 * 10^{12}Hz.

To find the wavelength

We know that that the speed of light is given by the formula;

\( Speed of light, V = wavelength * frequency \)

Making wavelength the subject of formula, we have;

\( Wavelength = \frac {speed \; of \; light}{frequency} \)

Substituting into the equation, we have;

\( Wavelength = \frac {3 *10^{8}}{6.700 ✕ 10^{12}} \)

Simplifying the equation, we have;

Wavelength = 4.48*10^{-5} m

Therefore, the wavelength of the electromagnetic radiation is \(4.48*10^{-5} meters\)

Answer:

option d. 56/26 Fe is the correct answer.

Answer:

15.0°C

Explanation:

hope it helps

Heat Capacity

The heat capacity of a substance can be defined as the amount of heat required to change the temperature by a given amount the SI unit is joules per kelvin

The energy absorbed by the water is 105 joules

Given data:

mass of water = 5 grams

Change in temperature = 10 degrees from 15 degrees

The expression for the Quantity of heat is given by

Q = m x c x Δθ

Where m =mass

c = specific heat capacity and

Δθ = change in temperature

c = 4.2J/g/degrees

Q = 5 x 4.2 x (15 - 10)

Q = 5 x 4.2 x 5

Q = 105Joules

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Since Russia and the U.S.A have discovered new features on planets using spacecraft in modern times, this is an example of: C. how contributions by many different cultures throughout history have advanced our understanding of the solar system.

A solar system can be defined as a collection of the outer and inner astronomical or planetary bodies (planets) alongside the Moon that are in orbit around the Sun, in slightly elliptical orbits.  

Culture simply refers to the general way of life of people in a specific society or geographical area. This ultimately implies that, culture is a terminology which can be used to describe a sum total of the norms, beliefs, clothes, language, foods, and behaviors which a group of people that are living in a geographical area share in common.

In this context, we can reasonably infer and logically deduce that contributions by various cultures around the world have helped us to advance our understanding of the solar system.

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Answer:

just replace the 9 mole with 3.68 g of Al .

I think it will help you.

The substance exists as both a liquid and a solid during the time interval labeled "Plateau" on the cooling curve.

A cooling curve represents the change in temperature of a substance as it cools down. In the given cooling curve, the temperature is plotted on the y-axis, and time is plotted on the x-axis.

The interval labeled "Plateau" corresponds to a constant temperature region where the substance exists in equilibrium as both a liquid and a solid. This plateau represents the phase transition from the liquid phase to the solid phase.

During this time interval, as the substance cools down, it reaches its freezing point (the temperature at which it transitions from a liquid to a solid) and starts to solidify. However, due to the release of heat during the phase transition, the temperature remains constant until the entire substance has completely solidified.

Therefore, the substance exists as both a liquid and a solid during the "Plateau" interval on the cooling curve.

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Answer:

the attraction water molecules have to other surfaces

Explanation:

Adhesion is defined as  the attractive forces between unlike substances, e.g water moving up a capillary tube.

Adhesion is the tendency of dissimilar particles or surfaces to cling to one another(Wikipedia).

So, what we mean by adhesion in this context, is the attraction water molecules to other surfaces.

The equilibrium concentrations for the given reaction at a certain temperature will be 100.

During a reversible chemical process, chemical equilibrium is the state where there would be no net change in the number of reactants as well as products.

The reaction is the process in which by the combination of more than one element new kind of element will be formed.

Given data:

The given reaction is \(N_{2} (g) + O_{2} (g)\)  → \(2NO(g)\)

The equilibrium constant (K) = \([NO]^{2} /[N_{2}][O_{2}]\)

Put the value of the given data in the above equation.

K =  \(=[0.002 M]^{2} / [0.65M][0.45M]\\=[4*10^{-6} ]/ [0.2950]\\= [4*10^{-6} ] / 2950*10^{-4}\\= 1.35 * 10^{-5}\)

Therefore, the equilibrium constant will be 1.35 × \(10^{-5}\)

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this is a strong base and is one of the many bases that you're required to memorize.

The earth is composed of mineral elements either alone or in the combinations called the compounds. A mineral is composed of a single element or compound. Among the given statements, the correct statements are 1, 2 and 3 only. The correct option is B.

The naturally occurring inorganic solid with a definite chemical composition and a crystalline structure is defined as the mineral. The different minerals found under the surface of earth are characterized by the shape, hardness, luster, size, etc.

Each mineral has a unique lustre like silky, glossy, etc. some minerals have a characteristic colour, streak is the shade of a mineral when it is crushed into a fine powder. Hardness depends on the strength of bonds in minerals.

Thus the correct option is B.

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The binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond.  Option b

Aminoacyl-tRNA is a complex molecule that plays a crucial role in protein synthesis. It consists of a tRNA molecule covalently linked to an amino acid. The amino acid is attached to the 3' end of the tRNA molecule through an ester bond.

An ester bond is formed between the carboxyl group (-COOH) of the amino acid and the hydroxyl group (-OH) of the ribose sugar at the 3' end of the tRNA molecule. This ester bond is also referred to as an ester linkage. The formation of the ester bond is catalyzed by the enzyme aminoacyl-tRNA synthetase.

The ester bond in aminoacyl-tRNA is essential for protein synthesis. During translation, the aminoacyl-tRNA molecule carries the specific amino acid to the ribosome, where it is incorporated into the growing polypeptide chain. The ester bond is later hydrolyzed, releasing the amino acid for further use in protein synthesis.

In summary, the binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond between the carboxyl group of the amino acid and the hydroxyl group of the ribose sugar in the tRNA molecule.

Option b

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Answer: An ionic bond will be most likely formed between francium and chlorine having an electronegativity difference of 2.46.

Explanation: