What is the mass of 7.00 mol of hydrogen peroxide (H₂O₂)?
0.206 g
0.389 g
126 g
238 g

Answer:

25

E

12

Explanation:

As shown in the pic

Mass number = 12 + 13 = 25

Atomic number = No of protons = 12

Answer:

The only reason wood floats is because it is less dense and has big openings and gaps which allows air in.

Wood that sinks has very tiny openings. The ratio between weight and volume is called density. An object that is less dense than water can be held up by water, and so it floats.

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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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thermal conduction and convection processes we explain the temperature profile: warmer at the bottom and colder at the top

Temperature is a measure of the internal energy of molecules.

When the pot is on the burner, the lower part of the pot acquires energy from the flame, this energy increases the temperature of the metal that is in contact with the liquid from the bottom, by a process of thermal conduction, while the liquid in the top is kept at the same temperature.

As time progresses, the hotter lower liquid, for which it has a lower with the metal bottom heats up by conduction. density, conscientiously rise and a transfer of heat is created by convection, which raises the temperature of the hot liquid and makes the liquid fall that is colder from the upper part than at the coming into contact

This cycle is repeated heating all the liquid. But the liquid with the liquid in the lower part always at a higher temperature than the liquid in the upper part, the process stops when the liquid in the lower part reaches the boiling point, than the passage from liquid to gas, during which the temperature remains constant.

With the thermal conduction and convection processes we explain the temperature profile: warmer at the bottom and colder at the top.

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Answer:This is a Flint lighter, It's usually used to make sparks to light things like burners in chemistry.

Explanation:

242 ml of a 0.121 m aqueous solution of iron(iii) acetate, must be taken to obtain 6.79 grams of the salt

Determining the quantity of Iron acetate solution:

To determine how many ml of a 0.121 M aqueous solution of iron(III) acetate are needed to obtain 6.79 grams of the salt, follow these steps:

1. Calculate the molar mass of iron(III) acetate: Fe(C2H3O2)3
  Fe: 55.85 g/mol
  C2H3O2: (2 * 12.01) + (3 * 1.01) + (2 * 16.00) = 59.05 g/mol
  Molar mass of Fe(C2H3O2)3: 55.85 + (3 * 59.05) = 232.00 g/mol

2. Calculate the number of moles of iron(III) acetate in 6.79 grams:
  moles = mass / molar mass = 6.79 g / 232.00 g/mol ≈ 0.0293 mol

3. Calculate the volume of the 0.121 M aqueous solution needed:
  Volume = moles/molarity = 0.0293 mol / 0.121 M ≈ 0.242 ml

Therefore, you need approximately 242 ml of a 0.121 M aqueous solution of iron(III) acetate to obtain 6.79 grams of the salt.

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Answer:

Explanation:

Edmentum

The arrangement of electrons within an atom's orbitals is known as its electronic configuration. The atomic number, which is equal to the number of protons in every neutral atom, is the set quantity of electrons that make up each neutral atom.

The distribution of an element's atoms' electrons throughout several atomic orbitals is symbolically represented by the electronic configuration of that element.

A standardized nomenclature is used for expressing electron configurations, in which the energy level and type of orbital are written first, followed by the number of electrons in the orbital, which is expressed in superscript.

The correct matches are:

Zn: [Ar] 3d¹⁰ 4s²

Fe: [Ar] 3d⁶ 4s²

Sn: [Kr] 4d¹⁰5s²5p²

Cl: [Ne] 3s² 3p⁵

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Answer:

2

Explanation:i did the test

The rate constant for the reaction at 35 °C is 7.44 × 10^6 M^−1 s^−1. The initial rate of the reaction at 35 °C is 7.50 × 10^-1 M/s. The ratio is greater than 1, OH^- is limiting. The rate constant at 50°C is 2.05 × 10^11 M^−1 s^−1.

A: To predict the rate constant for the reaction at 35 °C, the Arrhenius equation can be used:

k = Ae^(-Ea/RT)

Where k is the rate constant, A is the frequency factor, Ea is the activation energy, R is the gas constant (8.31 J/mol K), T is the temperature in Kelvin (35 + 273 = 308 K), and e is the base of the natural logarithm.

Plugging in the values, we get:

k = 2.10 × 10^11 e^(-86,800/8.31*308)

k = 2.10 × 10^11 e^(-10.51)

k = 2.10 × 10^11 * 3.52 × 10^-5

k = 7.44 × 10^6 M^−1 s^−1

So the rate constant for the reaction at 35 °C is 7.44 × 10^6 M^−1 s^−1.

B: To find the initial rate at 35 °C, the concentration of each reactant must first be calculated. The concentration of KOH is given by:

C_KOH = m/V = 0.359 g / (228.0 mL * 10^-3 L/mL) = 1.57 × 10^-3 M

The concentration of C2H5I is:

C_C2H5I = m/V = 1.477 g / (228.0 mL * 10^-3 L/mL) = 6.48 × 10^-3 M

The initial rate of the reaction can be found using the rate law, which states that the rate is proportional to the product of the concentrations of each reactant raised to the power of its stoichiometric coefficient:

rate = k * [C2H5I] * [OH^-]

Since the reaction is first order in each reactant, the rate law can be written as:

rate = k * [C2H5I] * [OH^-] = k * 6.48 × 10^-3 * 1.57 × 10^-3 = k * 1.01 × 10^-5

Plugging in the rate constant from Part A, we get:

rate = 7.44 × 10^6 * 1.01 × 10^-5 = 7.50 × 10^-1 M/s

So the initial rate of the reaction at 35 °C is 7.50 × 10^-1 M/s.

C: To determine which reagent is limiting, the molar ratio of each reactant must be compared to its stoichiometric ratio in the reaction. The stoichiometric ratio of C2H5I to OH^- is 1:1, so if the molar ratio of C2H5I to OH^- is less than 1:1, then C2H5I is limiting. If the molar ratio is greater than 1:1, then OH^- is limiting.

The molar ratio of C2H5I to OH^- is:

[C2H5I]/[OH^-] = 6.48 × 10^-3 M / 1.57 × 10^-3 M = 4.12

Since this ratio is greater than 1, OH^- is limiting.

D: To calculate the rate constant at 50°C, we need to use the Arrhenius equation, which states that the rate constant k is related to the activation energy E and the temperature T by the following equation:

k = Ae^(-E/RT),

where A is the frequency factor, R is the gas constant (8.31 J/mol•K), and T is the temperature in Kelvin.

First, we need to convert the temperature to Kelvin: 50°C = (50 + 273.15) K = 323.15 K.

Next, we can plug in the values for A, E, and T into the equation:

k = 2.10 × 10^11 e^(-86.8 kJ/mol / (8.31 J/mol•K) (323.15 K)) = 2.10 × 10^11 e^(-0.02653) = 2.10 × 10^11 (0.9735) = 2.05 × 10^11 M^−1 s^−1.

So, the rate constant at 50°C is 2.05 × 10^11 M^−1 s^−1.

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The correct answer is option (c) CH3CHO. The Reaction of ethylmagnesium bromide with CH3CHO compound yields a secondary alcohol after treating it with aqueous acid

Ethylmagnesium bromide (C2H5MgBr) is a Grignard reagent commonly used in organic synthesis. It is known for its nucleophilic properties and can react with various carbonyl compounds to form alcohols.

When ethylmagnesium bromide reacts with CH3CHO (acetaldehyde), the resulting reaction is shown below:

C2H5MgBr + CH3CHO → C2H5CH(OH)CH3 + MgBrOH

The intermediate product formed after the reaction with ethylmagnesium bromide is a tertiary alcohol, which can then be treated with aqueous acid (such as H3O+) to undergo acid-catalyzed dehydration. This process leads to the formation of a secondary alcohol.

Therefore, the reaction of ethylmagnesium bromide with CH3CHO yields a secondary alcohol after treating it with aqueous acid.

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The oxidation number of Na in the compound Na2CO3 is +1.

To determine the oxidation number of Na in Na2CO3, we need to consider the known oxidation numbers of other elements and the overall charge of the compound.

1. The compound Na2CO3 contains two Na atoms and one C atom, along with three O atoms.

2. Oxygen (O) typically has an oxidation number of -2, unless it is in a peroxide where it is -1.

3. Carbon (C) is more electronegative than hydrogen (H) but less electronegative than oxygen (O), so it usually has an oxidation number of +4 in compounds.

4. The compound Na2CO3 has a neutral charge, which means the sum of the oxidation numbers of all the elements must be zero.

5. Let's assign the oxidation number of Na as x. Since there are two Na atoms, the total oxidation number contribution from Na is 2x.

6. The oxidation number of C in CO3 is +4, and the oxidation number of O is -2. Since there are three O atoms in CO3, the total oxidation number contribution from O is 3*(-2) = -6.

7. Setting up the equation: 2x + 4 + (-6) = 0.

8. Solving the equation: 2x - 2 = 0, 2x = 2, x = 1.

Therefore, the oxidation number of Na in Na2CO3 is +1.

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Answer:

polythene is one of the most used plastic in the world

Explanation:

Properties of polythene are

1.Economical

2.Low co-efficient of friction

3.Excellence chemical resistance

4.Good impact resistance

5.Good fatigue and wear resistance

6.Resistance to many solvents

Examples of polythene

1. Beverage bottles

2.Food bottles

3.polyester clothing

4.Rope

How it's made

Option D, NaCl(aq) + AgNO3(aq) → NaNO3(aq) + AgCl(s), is the balanced chemical equation that represents a single-replacement reaction.

What is Replacement Reaction?

In chemistry, a replacement reaction is a type of chemical reaction where one element replaces another in a compound. The general formula for a replacement reaction is:

A + BX → AX + B

where A and B are elements, and X is an anion that can combine with A and B. In this reaction, A replaces B in the compound BX, forming a new compound AX and releasing the element B as a free element. Replacement reactions can be of two types: single replacement reactions and double replacement reactions, depending on whether one or two elements are replaced in the reaction.

In this reaction, sodium (Na) replaces silver (Ag) in the compound AgNO3 to form NaNO3, and silver is released as a free element in the form of AgCl.

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Answer:High density

Explanation:

The metal doesn't remains gas at room tempreture, it doesn't have brittleness property and it is not poor conductor of electricity .But, it has high density .

Hope, it would be correct.

The water content of the sample, we need to determine the weight of water in the wet soil.

First, let's find the weight of water in the sample by subtracting the weight of the dry soil plus the container from the weight of the wet soil plus the container:

Weight of water = (Weight of wet soil + container) - (Weight of dry soil + container)

Weight of water = 17.53 g - 14.84 g = 2.69 g

Next, we need to find the weight of the dry soil. This can be obtained by subtracting the weight of the empty container from the weight of the dry soil plus the container:

Weight of dry soil = (Weight of dry soil + container) - (Weight of empty container)

Weight of dry soil = 14.84 g - 7.84 g = 7 g

Now, we can calculate the water content as the ratio of the weight of water to the weight of dry soil, multiplied by 100 to express it as a percentage:

Water content = (Weight of water / Weight of dry soil) * 100

Water content = (2.69 g / 7 g) * 100

Water content ≈ 38.43%

Therefore, the water content of the sample of silty clay is approximately 38.43%.

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Answer: D

Explanation:

D - Decomposition of carbonates into oxide and carbon dioxide

A - Combustion reaction. Combustion of methane to form Carbon dioxide and water.

C - Reaction of reactive metal (Na) and water to form hydroxide.

B - No particular name of the reaction. Usually denoted as a synthesis redox reaction.

Answer:CaCO3  CaO + CO2

Explanation: just took it

Answer:

Atom

Explanation:

Atoms are the smallest particles that can be separated. Elements are substances that contain just one kind of atom. Therefore, since Gold (Au) is an element, then its representive particle is ATOM.

Answer:

metallic

Explanation:

The dislocated electrons moving around the protons create opposite charges with electrostatic attraction between them that are very strong, and are called metallic bonds.

The particles in a metal are held together by strong metallic bonds . The metals forms crystalline solids with highly ordered  lattice structure.

Metals are electropositive elements. They are rich in electrons and easily donate their electrons with non-metals to form ionic bonds. Metals gain  positive charge by losing electrons.

Metals in periodic table are classified as s block elements that are alkali metals and alkaline earth metals and d-block elements that are transition metals.

Metals forms highly ordered crystal lattice 3 D structures  in which metal ions negative ions or electrons are bonded by strong intermolecular force called metallic bonds and the free electrons are located in the interstices.

These electrons can delocalize and conduct thermally and electrically.Hence, the bond which hold the particles in a metal is called metallic bond.

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Answer:

I believe the answer is A

The rate constant for a reaction at a specific temperature can be determined experimentally using the appropriate mathematical equations, such as the Arrhenius equation.

In order to determine the rate constant for a reaction, we need to use experimental data and apply the appropriate mathematical equations. The rate constant is a proportionality constant that relates the rate of a chemical reaction to the concentration of reactants.

One common method to determine the rate constant is to measure the rate of the reaction at different concentrations of reactants and plot the data in a graph. The slope of the graph is equal to the rate constant. However, without specific details about the reaction, it is impossible to provide a specific rate constant for a given temperature.

The rate constant also depends on the temperature of the reaction, as the rate of reaction generally increases as temperature increases. Therefore, we need to know the temperature at which the reaction is occurring to determine the rate constant.

Once we have the necessary experimental data, we can use the Arrhenius equation to calculate the rate constant at a specific temperature. The Arrhenius equation relates the rate constant to the activation energy of the reaction, the temperature, and a constant called the pre-exponential factor.

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Left- and right-handed mirror image molecules are known as stereoisomers. Stereoisomers have the same molecular formula and the same connectivity of atoms, but the arrangement of the atoms in space is different. Stereoisomers are formed due to the presence of a chiral center in the molecule

A molecule is said to be chiral if it has a non-superimposable mirror image. Chiral molecules cannot be superimposed on their mirror image. This means that the left- and right-handed mirror images of a chiral molecule are not identical and are not superimposable on each other. Chiral molecules are very important in the field of biology and pharmacology because they interact differently with other chiral molecules in biological systems and can have different biological activities or therapeutic effects.Most biological molecules, such as amino acids, sugars, and DNA, are chiral. Amino acids and sugars are chiral because of the presence of an asymmetric carbon atom in their structures. DNA is chiral because of the helical structure of its double-stranded form. The handedness of chiral molecules can have significant implications for their biological activity, as the interaction between two chiral molecules can depend on their relative handedness.The study of stereoisomers is important in the field of organic chemistry and biochemistry. Understanding the stereochemistry of molecules is essential for understanding their properties and behavior. Stereoisomers can have different physical properties, such as melting point and solubility, and different biological activities, such as receptor binding and enzyme catalysis.

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Answer:

30,000 cm^3

Explanation:

volume for rectangular prism is v=l×w×h

plug in known values and solve.

v=(30.0cm)(20.0cm)(50.0cm)=30,000cm^3

Answer:

C. The Zebra Mussels had not yet been introduced to the area.

2.

Unionid Mussels they had a headstart in 1990

The refractive index of the glass is 1.5 and the angle of refraction of the transmitted beam is 33.5°.

The refractive index of the glass can be calculated using Snell's law, which states that the ratio of the sines of the angles of incidence and refraction is equal to the ratio of the velocities in the two media. In this case, the velocity in air is greater than the velocity of light in the glass, so the sine of the angle of incidence is greater than that of the angle of refraction.

Substituting the values, the angle of refraction of the transmitted beam is 33.5°.  This result can also be confirmed using the law of reflection, which states that the angle of incidence is equal to the angle of reflection. Since the angle of incidence is 58.5°, the angle of reflection must also be 58.5°.

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Answer: A

Explanation:

because it is

When attempting to pick up a stock bottle, it is important to hold the bottle properly to prevent accidents and spills.

Here are the general steps to follow: Ensure that the bottle is properly labeled and that you have the correct bottle for the intended use. Check the condition of the bottle for any signs of damage or leaks. If you detect any damage or leaks, do not use the bottle and notify the appropriate personnel. Put on any necessary personal protective equipment (PPE), such as gloves and safety glasses, before picking up the bottle. Hold the bottle with both hands, with one hand on the bottom of the bottle and the other hand on the neck of the stock bottle. This helps provide stability and balance. Lift the bottle slowly and steadily, being careful not to tip the bottle or drop it. If the bottle is heavy, use a cart or a dolly to transport it instead of carrying it by hand. When placing the bottle down, do so gently and carefully to avoid any spills or damage.

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