This element is in the noble gas family and has 5 energy levels.

Calorimetry Experiment: Calorimetry is a technique used to estimate changes in enthalpy of chemical reactions. There are two types of calorimetry experiments that are given below :

1. Enthalpy changes of reactions in solution.

2. Enthalpy changes of combustion.

According to question,

The biggest source of error in calorimetry is usually temperature measurements, unwanted heat loss to the surroundings, this can be fixed by adding a lid.

Stirring error : Calorimetry is not insulated in a proper way.

Personal sources of error : It contains many error one of the important and usual error is measurement error, error in the volume or weight.

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Answer:

Chemistry Secondary School answered Mg (OH)₂ + HCl→ MgCl₂ + H₂O balance it Answer 5.0 /5 6 Diabolical Answer: The answer will be; = Mg (OH)₂ + 2 HCl → MgCl₂ + 2 H₂O That's all. Find Chemistry textbook solutions? Class 12 Class 11 Class 10 Class 9 Class 8 Class 7 Class 6 Preeti Gupta - All In One Chemistry 11 3080 solutions

If 11.5 g of CCl3F is enclosed in a 1.0-L container at 300 K with a vapor pressure of 856 torr, some of it will be present in the liquid state. The mass of the liquid will be 5.201 g.

Based on the given information, we can use the ideal gas equation to determine the number of moles of CCl3F present in the container. The vapor pressure of CCl3F at 300 K is given as 856 torr, which can be converted to 114124 Pa. The volume of the container is 1.0 L, and the temperature is 300 K. Using these values, we can calculate the number of moles of CCl3F present in the container to be 0.04576 mol.

Since we know the molar mass of CCl3F is 137.37 g/mol, we can calculate the mass of the gas present in the container to be 6.29 g. This means that some of the CCl3F will be in the liquid state since the initial mass of CCl3F was 11.5 g.

To calculate the mass of liquid present, we subtract the mass of gas (6.29 g) from the initial mass of CCl3F (11.5 g), which gives us 5.201 g. Therefore, 5.201 g of CCl3F will be present in the liquid state in the container.

The vapor pressure of CCl3F at 300 K is 856 torr, which is equivalent to 114124 Pa when converted. Given that 11.5 g of CCl3F is enclosed in a 1.0-L container, we can determine if liquid will be present and its mass using the Ideal Gas Law (PV = nRT).

First, we calculate the moles of gas (n) using the equation n = PV/RT. Plugging in the values, we get n = (114124 x 1.0 x 10^-3) / (8.314 x 300) = 0.04576 mol.

Next, we calculate the mass of the gas by multiplying the moles by the molar mass of CCl3F (137.37 g/mol). This gives us a mass of 6.29 g.

To find the mass of the liquid, we subtract the mass of the gas from the initial mass (11.5 g). Therefore, the mass of the liquid present is 5.21 g.

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The acid which contains sulfate ions can be tested by the reagent which is barium chloride.

Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste.

According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic  acids  depending on the number of protons which are liberated on dissociation.

Acids are widely used in industries  for  production of fertilizers, detergents batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.

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Elecetronegativity will affect the replacement reactions as it attracts the bonded electrons towards itself.

Replacement reactions are those reactions in which replacement of any one element from any compound is done by any other element.

Electronegativity is the attracting power of any element to hold the bonded electron towards itself so that they will bear a partial negative charge on itself. If in any reaction replacement of anion is required and any compound have more electronegative element which bounded the bonded electron strictly and will not allow the formation of anion then it affects the activity of the reaction.

Hence electronegativity affect the replacement reactions.

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Answer:

Speed

Explanation:

Motion can be represented by a distance-time graph, which plots distance on the y-axis and time on the x-axis. The slope of a distance-time graph represents speed. The steeper the slope is, the faster the speed.

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Taking the item with the lowest boiling point first. I II III arrange the following substances according to their rising boiling points.

A material formed by the chemical fusion of two or more different components in science Water (H2O), which is produced from the elements hydrogen and oxygen, and table salt (NaCl), which is made from sodium and chloride, are two examples of compounds.

Covalent bonds between carbon and hydrogen, as well as commonly additional atoms, are used to create organic compounds. Benzoic acid, diethyl malonate, propanoic, butanoic, and malonic acids are a few examples of organic compounds, along with aromatic and heterocyclic substances.

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Answer:

A: 4

B: 2

C: 3

D: 1

Explanation:

Sc³⁺ion has a lower ratio of charge to volume.

Charge density will be higher for Al3+. The ratio of an ion's charge to its volume is known as its charge density. The amount of charge and the volume of the ion are two characteristics of the ion that influence its charge density.

The size determines the volume. The volume of an ion increases with its size. It is inversely proportional to ion volume and directly proportional to charge magnitude. Sc and Al are in the fourth and third periods of the periodic table's third and thirteenth groups, respectively. Size-wise, Sc is bigger than Al. Sc3+ is larger than Al3+ in a similar manner. Both species have the same amount of charge, however, because Al3+ is smaller than Sc3+ due to its smaller size, it has a lower volume. Al3+ will consequently have a greater charge density due to volume size.

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Answer: No

Explanation:

A periodic table can be defined as the table in which the row of chemical elements are present. All the elements of the row have same number of electron shells.

The arrangement of elements is based on atomic numbers, electron shell model and other chemical properties. The elements are placed in increasing order of atomic number.

This table does not give information about the occurrence of the elements.

Answer:

Seasonal Winds: Blow in opposite direction of normal winds  and cause droughts in winter.

Prevailing Winds: Blow mainly in one direction and move huge air masses.

Mountain Ranges: force coastal air masses to rise, cool, and  form rain clouds.

Explanation:

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The term precipitation implies the falling of rain due to condensation of water vapor in the cloud.

The term precipitation implies the falling of rain due to condensation of water vapor in the cloud.  We must note that several factors affect precipitation in a given area.

The following phrases below are matched with how it affects precipitation;

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Answer:

THE HEAT EVOLVED FROM THE COMBUSTION OF 1 MOLE OF GLUCOSE IS - 2819.7 KJ/MOL OR -2.82 * 10^3 KJ/MOL OF HEAT.

Explanation:

Write out the variables given:

Mass of glucose = 3 g

Heat capacity of bomb calorimeter = 2.21 kJ /°C

Mass of water = 1.2 kg

Specific Heat capacity of water = 4.184 kJ/kg °C

Change in temperature = ( 25.50 °C - 19.0 °C ) = 6.5 °C

To calculate the heat evolved from the combustion of 1 mole of glucose, we do the following:

Equation for the reaction:

C6H1206 (s) + 6 02 (g)--------> 6 CO2 (g) + 6 H20 (l)

Calculate the total heat capacity involved in the system:

Heat capacity (Ctotal) = Heat capacity of the bomb calorimeter + heat capacity of water

Ctotal = 2.21 kJ/°C  + (1.2 * 4.184 kJ/kg°C)

Ctotal = 7.2308 kJ°C

Next is to calculate the heat absoorbed by the calorimeter and water

Heat = Heat capacity (Ctotal) * change in temperature

Heat = 7.23 kJ/°C * 6.5 °C

Heat = 46.995 kJ

Hence, the amount of heat evolved when 3g of glucose was involved is 46.995 kJ

Since 1 mole of glucose reacts with 6 moles of oxygen to produce 6 moles of carbon dioxide and water respectively, then the amount of heat needed for the combustion of 1 mole of glucose is:

1 mole of glucose = (12 *6 + 1 * 12+ 16 *6) = 180 g/mol

From 3 g of glucose producing 46.995 kJ of heat

180 g of glucose will produce (180 * 46.995 / 3) kJ of heat

= 2819.7 kJ/mol of heat.

In conclusion, from the combustion of 1 mole of glucose, -2819.7 kJ/ mol of heat is evolved, since the heat was evolved or liberated.

Explanation: a homogeneous mixture forms when two or more substances are combined to make something uniform. In this type of mixture, the components must be evenly distributed troughout. Only one state of matter can be present and you can see individual ingredients.

As the metal scale will shrink as a result of the heat, making the measurement inaccurate, it would be too high.

The chemical reaction between potassium chloride and silver nitrate, in which solid silver chloride is precipitated out, is one of the greatest examples of precipitation reactions. This is the precipitation reaction's byproduct, the insoluble salt. Below is given the chemical equation for this precipitation process.

AgNO3(aqueous) + KCl(aqueous) → AgCl(precipitate) + KNO3(aqueous)

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Answer: "C the long-term survival of an entire species of organisms."

Explanation:

A - Yes, reproduction of the species is part of Evolution, it is not the best answer for the question taking into account the other possible answers.

B - Evolution is not necessarily a short-term thing, Evolution occurs over a long period of time.

C - *Refer to the explanation above.*

D - This answer has more to do with Ecosystems, rather than Evolution/Natural Selection.

Titanium nitride (TiN) can be coated onto cutting tools by either chemical vapor deposition (CVD) or physical vapor deposition (PVD). This statement is (a) True.

In the CVD process, a gaseous mixture of titanium tetrachloride and ammonia is introduced into a high-temperature reactor, where the gases react to form a solid TiN coating on the surface of the cutting tool.

This method is commonly used in industrial applications for coating large batches of cutting tools.

In the PVD process, a thin film of TiN is deposited onto the surface of the cutting tool through a physical process such as sputtering or evaporation.

This method is commonly used for the precision coating of individual cutting tools and is particularly effective for complex geometries and small parts.

Both methods offer advantages and disadvantages in terms of cost, equipment, and performance characteristics. The choice of deposition method typically depends on the specific application requirements and constraints.

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Answer:

The presence of drugs or chemicals in an organisms environment can also influence gene expression in the orgains.

The statement describe the transfer of heat is : the ice cubes gains the heat energy and the water looses the heat energy.

The law of mass of conservation mass states that mass neither be created or nor be destroyed. The law of mass of conservation energy states that the heat energy in the isolated system should de constant. if the one thing is loose the energy then the other in will gains the energy in an isolated system. according to the conditions the ice cube is at lower energy .

Thus the ice cube will gains the the heat energy that the water looses the heat energy.

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1768.7g of copper (II) sulfide would be formed if 18.5 moles of copper reacts.

What does the word "mole" mean?

A mole is 6.02214076 x 10^23 of any chemical quantity, including atoms, molecules, ions, and others. Due to the large number of atoms, molecules, or other components that make up any substance, the mole is a useful measure to use.

2 Cu + S₈ → 2 CuS

2 moles of Copper(II) sulfide is created when a reaction between two moles of copper and one mole of sulfur occurs.

Mass of Cu = no. of moles of Cu × Molar mass of Cu

                   = 18.5 mol × 63.55 g/mol

                   = 1174.18 g

2 moles of Cu gives 2 moles of CuS

18.5 moles of Cu will give 18.5 moles of CuS

Mass of CuS will be 18.5 ×95.61 i.e. 1768.7g

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In procedure 12.3, when the pH indicator phenolphthalein is first added, the solution is expected to be colorless. This is because phenolphthalein is a colorless compound in acidic solutions and only turns pink or red in basic solutions.

To measure the rate of cellular respiration using phenolphthalein, we need to add a small amount of NaOH to the solution after adding the pH indicator. The NaOH will react with the carbonic acid produced by the cellular respiration, increasing the pH of the solution and causing the phenolphthalein to turn pink or red.
According to the experimental protocol, we should add 1-2 drops of NaOH at a time while monitoring the color change of the solution. We should continue adding NaOH until the solution turns pink or red, indicating that the pH has become basic. However, we should be careful not to add too much NaOH, as this could cause the pH to become too basic and interfere with the accuracy of our measurements.
Overall, by using phenolphthalein as a pH indicator and carefully adding NaOH, we can accurately measure the rate of cellular respiration and better understand the metabolic processes occurring within living organisms.

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Answer: Balanced forces

Explanation: Equal forces acting in opposite directions are called balanced forces. Balanced forces acting on an object will not change the object's motion.

Answer:

Sam's average speed  = 2.22 m/s

Explanation:

The average speed refers to the speed with which a distance is covered within a particular time duration. The average speed of a moving object can be obtained by summing up all the varying speeds as the object moves from one point to another, within a particular time frame.

Sams average speed can be calculated using this formula:

Average speed = distance / time

Distance covered = 2000 meters

Time taken to cover the distance = 9:15 am - 9:00 am = 15 minutes = 15 X 60 seconds = 900 seconds

Sam's average speed = 2000meters / 900 secs = 2.22 m/second

Answer: tell me

Explanation:

i do not no

The kind of intermolecular forces that act between a hydrogen molecule and an argon atom is dispersion forces (option D).

Intermolecular forces are the attractive forces that act between molecules or atoms. The strength of these forces determines the physical properties of substances such as boiling points, melting points, and solubility. The five main types of intermolecular forces are: Dispersion forcesDipole-dipole interactionsHydrogen bondingIon-dipole interactionsIn the given case, a hydrogen molecule is a nonpolar molecule consisting of two hydrogen atoms sharing electrons equally between them. An argon atom is also a nonpolar atom because it has a complete octet of electrons and no permanent dipole moment.

Therefore, the only intermolecular force that can act between them is the dispersion force. Dispersion forces are caused by temporary dipoles that are induced in nonpolar molecules or atoms when they come close to each other. These temporary dipoles cause the electron distribution in adjacent molecules or atoms to become distorted, leading to a weak attraction between them. Since hydrogen molecules and argon atoms are both nonpolar, they experience dispersion forces when they come close to each other. Hence, option D is the correct answer.

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Answer:

Constant volcanic eruptions Hope this helps!

In the molecule CH3CN (acetonitrile), let's determine the hybridization and electron geometry for each non-hydrogen atom:

Carbon (C):

The central carbon atom is bonded to three hydrogen atoms (H) and one nitrogen atom (N).

Hybridization: The carbon atom is sp3 hybridized since it forms four sigma bonds (three with hydrogen and one with nitrogen).

Electron Geometry: The carbon atom has a tetrahedral electron geometry.

Nitrogen (N):

The nitrogen atom is bonded to one carbon atom (C) and has a lone pair of electrons.

Hybridization: The nitrogen atom is sp hybridized since it forms one sigma bond with carbon and has a lone pair.

Electron Geometry: The nitrogen atom has a linear electron geometry.

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"The substance described, which conducts electricity in the liquid phase but not in the solid phase, can be classified as an electrolyte." Electrolytes are substances that ionize and produce ions capable of conducting electric current when dissolved in a solvent, typically a liquid.

In the liquid phase, the ions are free to move and carry the electric charge, allowing the substance to conduct electricity. However, in the solid phase, the ions are usually locked in a fixed position and cannot move freely, resulting in a lack of electrical conductivity.

Electrolytes are substances that, when dissolved in a solvent like water, form electrically conductive solutions. They are typically ionic compounds or salts that break down into positive and negative ions when dissolved. The presence of these ions allows the solution to conduct electric current.

In an electrolyte solution, the positive ions are called cations, while the negative ions are called anions. When an electric potential is applied across the solution, the cations move toward the negative electrode (cathode), and the anions move toward the positive electrode (anode). This movement of ions enables the flow of electric charge, making the solution conductive.

Electrolytes are crucial for various biological processes and essential for the functioning of our bodies. They help maintain the balance of fluids and ions, regulate nerve and muscle function, and contribute to cellular processes like osmosis and pH regulation.

Examples of electrolytes include common substances like sodium chloride (table salt), potassium chloride, calcium chloride, and magnesium sulfate. These electrolytes can be found in various foods, beverages, and electrolyte replacement solutions. They are also used in batteries, fuel cells, and various industrial processes that require electrical conduction in liquids.

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Answer:

1. 95.7 ppm

2. 6.67 ppm

Explanation:

Podemos pensar la denominación ppm como partes por millón, es un tipo de unidad que define concentración de solutos en una solución.

ppm = μg/g  o si lo queremos ver en volumen, μg/mL

Quiere decir microgramos de soluto en 1 g de solución o mL de solución.

Ej 1.  En primer lugar convertimos los moles de KNO₃ a gramos

0.00071 mol . 101.1 g/mol = 0.071781 g

Si pasamos los gramos a μg → 0.071781 g . 1000000 μg/ 1g = 71781 μg

Dividimos 71781 μg /750 ml = 95.7 ppm

Ej 2. Convertimos los mg a μg → 4 mg . 1000 μg/ 1 mg = 4000 μg

Ahora dividimos: 4000 μg /600 ml = 6.67 ppm

Answer:

Sure, with what?

Ps- Just to increase word count

Answer:

D is correct.  Atoms of the same element are the same

Explanation:

6. Which of the following statements is one of the postulates in Dalton's atomic theory?

A) All atoms are all the same.

B) Only some elements are composed of atoms.

C) Atoms of the same element are different.

D Atoms of the same element are identical.

D is correct.  Atoms of the same element are the same

Atoms of different elements are different

when different atoms combine, they do this in simple ratios and form molecues which are the building block of compounds

Atoms of the same element are identical.

Matter is made up of atoms that are indivisible and indestructible.

Dalton hypothesized that the law of conservation of mass and the law of definite proportions could be explained using the idea of atoms.

He proposed that all matter is made of tiny indivisible particles called atoms.

Hence, option D is correct.

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The number of molecules : N = 1.505 x 10²³

Given

0.25 mol N₂O₄

Required

The number of molecules

Solution

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

N = 0.25 x 6.02.10²³

N = 1.505 x 10²³