1. 34g of CaCO3 was heated and decomposed completely. The reaction equation is shown below.
CaCO3(s) --> CaO(s) + CO2(g)

1.1 calculate the number of moles of CaCO3 that decomposed
1.2. Calculate the number of particles of CaO that can be produced

The balanced equation for the given chemical reaction is:

Cu(s) + 4 HNO3(aq) → Cu(NO3)2(aq) + 2 NO2(g) + 2 H2O(l)

In this chemical reaction, copper (Cu) reacts with nitric acid (HNO3) to produce copper nitrate, nitrogen dioxide, and water.

A balanced equation is one where the number of atoms on both sides of the equation is the same. The balanced equation shows that one copper (Cu) atom reacts with four nitric acid (HNO3) molecules, forming one copper nitrate (Cu(NO3)2) molecule, two nitrogen dioxide (NO2) molecules, and two water (H2O) molecules.

Thus, when the given equation is balanced with the lowest whole-number coefficients, the coefficients are:

Cu(s) + 4 HNO3(aq) = Cu(NO3)2(aq) + 2 NO2(g) + 2 H2O(l).

Therefore, the coefficients of the equation are Cu(s) + 4HNO3(aq) + Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l).

The solution to the problem above was provided with the correct balanced equation and a thorough explanation.

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Since a pure liquid freezes at a constant temperature, a flat, horizontal zone is anticipated on the cooling curve. if the liquid is allowed to cool until it is completely frozen.

The temperature will then continue to drop as the solid cools, eventually reaching the bath's temperature.

When a liquid is cooled in a constant-temperature bath, a cooling curve for the liquid illustrates graphically how the temperature changes over time. To preserve temperature uniformity, the liquid is enclosed in a test tube and continually swirled. Two elements dominate in determining the pace of cooling. The temperature differential between the liquid and the bath is the first. As the liquid temperature approaches the bath temperature as a result of this factor, the cooling curve gradually becomes less steep (has a lower negative slope), finally approaching zero, and producing a horizontal line at the bath temperature.

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1. Water flows through the penstock

2. The water then spins the blades in a turbine which, in turn, spins a generator that ultimately produces electrical energy

Hydropower, or hydroelectric power, is one of the oldest and largest sources of renewable energy, which uses the natural flow of moving water to generate electrical energy. The moving water is passed through a pipe also known as penstock, it then turns the blade of the turbine. which then rolls or spin a generator thereby electricity is produced.

The work of the turbine is to convert the kinetic energy of the running water into useable energy.

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Answer:

The uses of hydrogen gas are to produce electricity, heat, power, fertilizer, and many more.

Hope this helps :)

Answer: Unbalanced Forces

Explanation: The bigger the unbalanced force acting on the object the bigger the acceleration of the object. The more mass the object has, the more inclined it is to resist any change to its motion.

The efficiency of the engine that absorbs 2500 J of heat and performs 1000 J of mechanical work in each cycle is 40%.

The formula for the engine's efficiency is as follows:

η = (W/Q) x 100

η = the engine efficiency

W = work done by the engine

Q = heat absorbed by the engine

Q = 2500 J is the amount of heat that a gasoline engine can absorb.

Engine performs mechanical work at a rate of W = 1000 J.

The idea of engine efficiency is frequently used to rate and quantify the propensity to perform work. The ratio of work produced to the amount of heat supplied is used to express it.

So, the efficiency of the engine:

η = (W/Q) x 100

= (1000 J / 2500 J) x 100

= 0.4 x 100

= 40%

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Answer: In CaF2, the oxidation number of Ca is +2

, and that of F is -1

. In H2SO4, the oxidation number of H is +1

, that of S is +6

, and that of O is -2

. In CaSO4, the oxidation number of Ca is +2

, that of S is +6

, and that of O is -2

. In HF, the oxidation number of H is +1

, and that of F is -1

Answer:

The atomic number is the number of protons in the nucleus. The mass number is the total of protons and neutrons. The mass number is always larger than the atomic number.

Explanation:

FYI, when you mention -2, it means that there would be 2 extra electrons which make the element negatively charged. The atomic number and mass are not dependent on the number of electrons.

Intermolecular forces, which hold the particles that make up solids and liquids together, have an impact on a number of the physical characteristics of matter in these two forms. Here the given figure represents intermolecular forces. The correct option is A.

The attracting and repellent forces that develop between the molecules of a substance are referred to as intermolecular forces (IMF), which is sometimes shortened. These forces operate as a mediator between a substance's individual molecules.

The majority of matter's physical and chemical properties are caused by intermolecular forces.

Thus the correct option is A.

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Answer:

c is correct answer my girl f

Answer:

Aluminum, a member of the IIIA family, loses three electrons to form a 3+ cation. ... And all of them form an anion with a single negative charge. The VIA elements gain two electrons to form anions with a 2- charge. The VA elements gain three electrons to form anions with a 3- charge.

The following statements about eukaryotic RNA polymerases (Pol I, Pol II, and Pol III) are true.

Pol I is responsible for transcribing ribosomal RNA (rRNA):

Pol I synthesizes the large rRNA precursor molecules that form the structural components of ribosomes.

Pol II is responsible for transcribing messenger RNA (mRNA):

Pol II transcribes protein-coding genes into pre-mRNA, which undergoes processing to produce mature mRNA.

Pol III is responsible for transcribing small functional RNAs:

Pol III synthesizes transfer RNA (tRNA), which carries amino acids to the ribosome during protein synthesis.

Pol III also transcribes small nuclear RNA (snRNA) involved in RNA splicing and 5S ribosomal RNA.

Each RNA polymerase recognizes specific promoter sequences:

Pol I recognizes the promoter elements found in the rRNA genes.

Pol II recognizes the promoter elements (such as the TATA box) in protein-coding genes.

Pol III recognizes promoters with internal promoter elements, including the Box A and Box B sequences.

Pol II is the most complex and highly regulated RNA polymerase:

Pol II requires additional transcription factors to initiate transcription and is regulated by various mechanisms, including enhancers and repressors.

In conclusion, eukaryotic cells employ three distinct RNA polymerases (Pol I, Pol II, and Pol III) that play specialized roles in transcribing different types of RNA molecules.

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Scientists have hypothesized that the O157:H7 strain of E. coli is so different from the K-12 strain due to a process called horizontal gene transfer. This is the transfer of genetic material between different bacteria, and it can occur through mechanisms such as conjugation, transformation, and transduction.

In the case of E. coli O157:H7, it is believed that the strain acquired new genes through horizontal gene transfer from other bacteria. These new genes may have provided the strain with new capabilities, such as the ability to produce toxins and survive in new environments. This could explain why the O157:H7 strain is more pathogenic and causes more severe illness than the K-12 strain.

Horizontal gene transfer is an important mechanism for the evolution and adaptation of bacteria, and it plays a significant role in the emergence of new bacterial strains with unique characteristics.

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Answer:

The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).

Explanation:

The element with the completely filled p-subshell is Ar (Option C)

This is the arrangement of elecartons in the atomic orbitals of an element. The modern electronic configuration makes use of the s, p, d, f orbital notation where

To obtain the correct answer, we shall write the electronic configuration of each element given in the question. This is illustrated below

From the above illustrations, we can see that only Ar has completely filled p-subshell.

Thus, Ar (Option C ) is the correct answer to the question

Complete question

See attached photo

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Answer:

the answer is three protons

C6H14 has London dispersion forces, dipole-dipole forces and van der Waals forces.

C6H14 is the molecular formula of hexane, which is an organic compound that belongs to the group of alkanes. This molecule is composed of six carbon atoms and 14 hydrogen atoms. The intermolecular forces are the forces of attraction between the molecules of the substance. They determine the state of matter of the substance, whether it is a solid, liquid, or gas.

The three types of intermolecular forces present in C6H14 are London dispersion forces, dipole-dipole forces, and van der Waals forces. London dispersion forces are present in all molecules and are the weakest of the three. Dipole-dipole forces are stronger than London dispersion forces and are present in polar molecules. Lastly, van der Waals forces refer to the sum of the London dispersion forces and the dipole-dipole forces.

Therefore, C6H14, being a nonpolar molecule, has London dispersion forces, and since it has no dipole moment, dipole-dipole forces are absent. The van der Waals forces of C6H14 is the combination of London dispersion forces and dipole-dipole forces.

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The initial kinetic energy is zero because the girl was at rest. The final kinetic energy is thus, 3100 J. Therefore, the change in kinetic energy is 3100 J

Kinetic energy of an object is generated by virtue of its motion. It is related to the mass and velocity of the object as follows:

Ke = 1/2 mv²

Given that, mass of girl = 50 kg

mass of bicycle = 12 kg.

total mass = 62 kg.

velocity = 10 m/s.

Then initial kinetic energy  = 0 since v = 0.

Then, ΔKe = 1/2 62 kg × (10 m/s)² - 0 = 3100 J

Therefore, the change in kinetic energy of the girl is 3100 J.

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The maximum temperature : a. 745 K

Given

Gas at 25°C(298 K) and at a pressure of 0.800 atm

Final pressure = 2 atm

Required

Final temperature

Solution

Gay Lussac's Law  

When the volume is not changed, the gas pressure in the vessel is proportional to its absolute temperature  

\(\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}\)

Input the value :

T₂=(P₂T₁)/P₁

T₂=(2 atm x 298 K)/0.8 atm

T₂ = 745 K = 472 °C

Answer:

its b alkyne

Explanation:

brinliest po plsss

Answer:

Alkyne so its b

A water heater can be regularly maintained by flushing it at least two times in a year.

A water heater is a device that is used to heat up water for home use. There are different types of water heaters but they all serve the same purpose at home. In order to maintain maximum efficiency, the water heater must be maintained regularly.

The following are routine maintenance operations on a water heater;

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(a) here no is the initial amount and no = 8 we are told that the culture doubles every 1.5 hours. we can use the model given to us in part a to find the variable a.

16-8.2 1.5/a

16 2

8 21 1.5/a = 2

1 = 1.5

a = 1.5

so our exponential model is now (n(t) = 8.2 ±/1.5

(b) Number of bacteria after 26 hours:

n(t) = 8.2/1.5

put t = 26

26/1.5

n(t) = 8.2

n(t) = 8(165140-37) n(t) ≈ 1321123.

Calculate the number of bacteria per milliliter or gram of sample by multiplying the number of colonies by the dilution factor times the amount of sample added to the liquefied agar. The easiest way to measure bacterial growth is to place the sample on a clear glass plate under a microscope and count the number of bacterial cells.

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The empirical formula for limonene is C5H8, which represents the simplest whole-number ratio of carbon to hydrogen atoms in the compound. This information can be useful in determining the properties and behavior of limonene in various chemical reactions and applications.

Limonene is a hydrocarbon compound found in the essential oils of citrus fruits. It is a common ingredient in many household and personal care products, and is often used as a flavoring agent in food and beverages. The empirical formula for limonene is a representation of its molecular composition in terms of its simplest whole-number ratio of atoms.

To determine the empirical formula for limonene, we first need to know its molecular formula. The molecular formula for limonene is C10H16, meaning it contains 10 carbon atoms and 16 hydrogen atoms.

The next step is to find the simplest whole-number ratio of carbon to hydrogen atoms in the compound. This can be done by dividing both the carbon and hydrogen atoms by their greatest common factor, which is 2 in this case. Dividing by 2 gives us a ratio of C5H8, which is the empirical formula for limonene.

The empirical formula for limonene, C5H8, tells us the simplest whole-number ratio of carbon to hydrogen atoms in the compound, but it does not provide any information about the arrangement of atoms in the molecule. To understand the molecular structure of limonene, we would need to determine its molecular geometry and bonding arrangement through more advanced chemical analysis techniques.

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Answer:

I believe the answer is Xenon since it is a noble gas

Answer:

I think the answer is A

Explanation:

If im wrong the answer is C

Absolute zero is an idea in thermodynamics that describes the lowest energy system.

Thermodynamics

Thermodynamics is the study of thermal energy and heat. One of the most important ideas in thermodynamics is entropy. Entropy is defined as the chaos within a system. Chaos is the movement or different orientations of molecules in a system. Entropy is related to temperature; the higher the temperature, the higher the entropy. High entropy means there is a large amount of chaos in a system, while low entropy is low chaos.

Absolute zero

Absolute zero occurs when the temperature of a system is 0 kelvin or -273.15 °C. Zero kelvin is the theoretical temperature in which entropy equals 0. This means that there is no movement or energy within a system. Absolute zero is the lowest energy a system can possibly have.

Answer:  

Explanation:

Claim:   Earth's atmospheric CO2 levels were measured over the past 1000 years and correlated with average world temperatures.  The data demostrate that Earth's temperature did not change during the period CO2 levels were steady.  But the past 100 years show a dramatic rise in CO2 levels, with a corresponding rise in world temperatures.  The CO2 rise can be traced back to the start of the industrial revolution, when machines began doing much of the work.  These machine burn fossil fuels and the increased CO2 levels have led to a dramatic rise in world temperatures.  The data clearly show the importance of reducing fossil fuel useage, as well as other CO2 emitters.  A world of incresing temperatures will lead to greater natural disasters, such as storms, flooding, hurricanes, and drought - all of which upset the ecological balance of the planet.

NaHCO3(s) + HC2H3O2(aq) → CO2(g) + H2O(l) + NaC2H3O2(aq)

This equation represents the reaction of baking soda (sodium bicarbonate) with vinegar (acetic acid) to generate carbon dioxide gas, water, and sodium acetate.

The balanced equation for the reaction of NaHCO3(s) with HC2H3O2(aq) including phase symbols is

NaHCO3(s) + HC2H3O2(aq) → CO2(g) + H2O(l) + NaC2H3O2(aq)

Baking soda, also known as sodium bicarbonate, is a white, crystalline powder with the chemical formula NaHCO3. It is an alkaline substance that neutralizes acids.

Vinegar is mostly composed of acetic acid, HC2H3O2, which is a weak acid. Vinegar has a sour flavor and a strong smell due to the presence of acetic acid.

NaHCO3(s) + HC2H3O2(aq) → CO2(g) + H2O(l) + NaC2H3O2(aq)  This equation represents the reaction of baking soda (sodium bicarbonate) with vinegar (acetic acid) to generate carbon dioxide gas, water, and sodium acetate. When the baking soda and vinegar are combined, a chemical reaction occurs, causing carbon dioxide gas bubbles to form. This is due to the reaction between the acid and base in the mixture, which generates carbon dioxide gas as a byproduct. This reaction is commonly used in baking as a leavening agent to make cakes, muffins, and other baked goods rise.

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