a neutral carbon atom has six protons in its nucleus, which means two electrons in the first energy level and the remaining four in the second energy level. T/F

Following represents the number of Molecules of the type indicated is present as a reactant or product of the chemical reaction shown is the coefficient of the species

The number of atoms, molecules, or formula units of a reactant or product in a balanced chemical equation is the coefficient of that species then the mole ratio of two substances in a chemical reaction is the ratio of their coefficients in the balanced chemical equation and the this numbers are called as coefficient and they tell how many of each molecule are participate in the reaction

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The ratio 1:1 of Rb and N react to form ionic compound rubidium nitride.

Rb(-1) + N(-3) ⇒ Rb₃N

Group 1 element with valency 1 is rubidium. Rubidium also gives up one of its outermost electrons to form a cation in order to achieve noble gas conformation. In contrast, nitride requires the addition of three electrons to become stable enough to form an anion. Rubidium nitride is an ionic binary compound and so we add ide suffix after the anion.

First, we need to be aware of the atoms' symbols. Rubidium, which is Rb, and nitride N are present in this. Write the symbols next to the names in the same order. The valency of the atom is indicated

Hence, rubidium and nitrogen forms binary compound.

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The appropriate units for the frequency of electromagnetic bare hertz (Hz). The number of complete oscillations made by a particle in one second is referred to as frequency.  Electromagnetic waves are a form of energy that travels through space in the form of oscillating electric and magnetic fields. They are produced by the acceleration of electric charges and can propagate through a vacuum or various materials.

The number of bcycles that occur in one second is referred to as frequency. It is measured in Hertz (Hz), which is the number of cycles per second.

In summary, the appropriate units for the frequency of electromagnetic radiation are hertz (Hz). Therefore, option b is the right answer

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Answer:

1. não entendi

.

3. não entendi

4. não entendi e

5. não entendi

2. não entendi

rysor

Explanation:

Answer:

here...

Explanation:

1 - Temperature is a quantitative measure of how hot or cold something is. Temperature is fundamentally linked to the kinetic energy of atom-scale particles. The Celsius scale is based on the older centigrade scale, adapted slightly to take account of the absolute temperature scale, measured in kelvins, symbol K.

2-  Increasing the temperature will cause chemical changes to occur faster. Decreasing the temperature, causes the particles to lose energy which causes them to move around less and slower. The less they move, the less collisions occur, and the less reactions occur between the chemicals = slower reaction rate.

3-  When a system absorbs or loses heat, the average kinetic energy of the molecules will change. Thus, heat transfer results in a change in the system's temperature as long as the system is not undergoing a phase change.

4-  As the temperature increases, the kinetic energy of the molecules of the liquid increases. The movement of the molecules gradually overcomes forces of attraction between the molecules, with the result that they have greater freedom to move, over greater volumes.

5- The kinetic molecular theory of matter states that: Matter is made up of particles that are constantly moving. Molecules in the solid phase have the least amount of energy, while gas particles have the greatest amount of energy. The temperature of a substance is a measure of the average kinetic energy of the particles.

Answer:

96.1 %

Explanation:

Which teacher do you have lol

Answer:

The fly cells must be compared with human cells

Explanation:

Dr. Gracia's aim is the development of a potential cancer treatment. Remember that the treatment is meant for human beings.

Usually, the pre-clinical trials of the treatment is carried out on other organisms and the success rate is evaluated before trial on humans.

If protein W has been effective on flies, its effect on human cells should also be diligently compared before conclusions are drawn regarding the therapeutic effects of protein W.

Answer: a solid transforms into a gas phase without first melting to form a liquid phase.

Explanation:

The number of moles of gas contained in 22.41L at 99.85 kPa and 0 degrees Celsius is (99.85 ˣ 1000 ˣ 22.41 ˣ 0.001) / (8.314 ˣ 273.15) moles.

To calculate the number of moles of gas contained in 22.41L at 99.85 kPa and 0 degrees Celsius, we can use the ideal gas law equation:

First, we need to convert the given pressure from kPa to Pa and the temperature from degrees Celsius to Kelvin:

Pressure: 99.85 kPa = 99.85 ˣ 1000 Pa (since 1 kPa = 1000 Pa)

Temperature: 0 degrees Celsius = 0 + 273.15 K

Now we can rearrange the ideal gas law equation to solve for the number of moles (n):

Substituting the given values:

Next, we need to convert the volume from liters to cubic meters:

Finally, we can calculate the number of moles of gas:

Performing the calculation will give you the number of moles of gas contained in 22.41L at 99.85 kPa and 0 degrees Celsius.

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The new volume of oxygen is 17.378 L.

“If a gas is contained in a closed chamber with constant mass and pressure, then its volume is directly proportional to its absolute temperature"

The relationship between volume and absolute temperature in the Charles equation is directly proportional. That is, if the temperature increases, the volume also increases. Conversely, if the temperature decreases, the volume of gas also decreases.

Thus, the simplest Charles law equation can be expressed as:

K = V/T

With,

V = gas volume (m³)

T =  absolute temperature (K)

k : constant

So, Charles' law equation can be written as:

V₁/T₁ = V₂/T₂

Where:

V₁ = initial volume of gas = 30 L

T₁ = initial temperature of gas = 473 K

V₂ = new volume of gas = ?

T₂ = new temperature of gas = 274

On putting all these values on the above equation, we get

V₂ = (30)(274) / 473 = 17.378 L

So, the new volume of oxygen is 17.378 L.

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Answer:

D

Explanation:

there are 5 electrons in the outer shell of the first picture

According to electronic configuration, model 1 shows 5 electrons in the outer shell of the atom.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Answer:

Water's polarity allows it to dissolve other polar substances very easily. When a polar substance is put in water, the positive ends of its molecules are attracted to the negative ends of the water molecules, and vice versa.

Explanation:

Answer/Explanation:

When a polar substance is put in water, the positive ends of its molecules are attracted to the negative ends of the water molecules, and vice versa.  Because molecular polarity results from the VECTOR sum of the individual bond dipoles. Water's polarity allows it to dissolve other polar substances very easily.

The reaction between HF(g) and water is exothermic.

Exothermic reactions release heat and energy to the surroundings, while endothermic reactions absorb heat and energy from the surroundings.

An example of an exothermic reaction is the combustion of gasoline in a car engine, where energy is released as heat and light.

Exothermic reactions release energy (usually in the form of heat) to the surroundings, while endothermic reactions absorb energy from the surroundings.

An example of an endothermic reaction is the reaction between barium hydroxide and ammonium chloride which results in the formation of barium chloride, ammonia, and water. The reaction absorbs heat from the surroundings, causing the temperature of the system to decrease.

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Answer:

A: solid and liquid

B: solid

C: gas

D: liquid and gas

E: solid

F: solid

Answer:

As the coil moves through the magnetic field, created by the magnet, an electric current flows through it. The electric current flows out from the microphone to a computer or other recording device, and you can hear it. Aspeaker works in almost the same way, except that the process isreversed.

Answer:

Earnest Rutherford

Explanation:

From what I beleive, Rutherford had created the nuclear model

Answer:

9.370 x 10 to the 23 molecules

Explanation:

91.72/1 x 1 mole Co/58.933g x 6.02 x 10 to the 23/1 mole Co

Answer:

Explanation:

Mass 1 mole of CO

C = 12

O = 16

m = 28

Mols of 91.72 grams

m = given Mass / Molar Mass

m = 91.72 / 28

m = 3.28 mols

Molecules

1 mol of anything is 6.02 * 10^23 molecules (in this case)

3.28 mol of CO = x

1/3.28 = 6.02*10^23/x      Cross multiply

x = 3.28 * 6.02 * 10^23

x = 1.97 * 10^24

A radioactive element has a half life of 10 days then there are  7 days would it take for 1000 grams of it to decay to 125 grams .

Calculation ,

radioactive element has a half life = 10 days ( given )

Kt = 0.069

K = 0.069 / t

K = 0.069 /  10 days = 0.0069

Kt = ㏑a/a-x

where ,

a = concentration of radioactive element at time 0  = 1000 grams

a-x = concentration of radioactive element at time t = 125 grams

Putting the value of a , a- x and K in equation ( i ) we get ,

0.0069 × t = ㏑1000 grams/125 grams = ㏑8 = 2.07

t= 2.07 / 0.0069 = 7 .05 days or 7 days

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Answer:

leachate

Explanation:

Bioleaching. Certain bacteria can break down ores to produce an acidic solution containing copper(II) ions. The solution is called a leachate and the process is called bioleaching . Bioleaching does not need high temperatures, but it produces toxic substances, including sulfuric acid, which damage the environment.

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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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Answer:

It’s actually 130 degrees Celsius.

Explanation:

Answer:

She can measure the volume and mass of the marble, the volume and mass of the water, and the mass of the graduated cylinder.

Explanation:

Graduated cylinders are used to measure volume, hence she can be able to measure the volume of the marble from the volume of water displaced. The measuring cylinder is also used to measure the volume of the water. The balance is used to measure the mass of the water and mass of the marble.

Answer:

water and a salt

Explanation:

Answer: 7

Explanation: i don't know how the HECK. -3-(-8)-(-2)=7 but I searched it up soooooo also I got it right

CaBr2 is an ionic bond. This is because the calcium gives up an electron to each of the chlorine atoms resulting in the calcium becoming Ca2+ ions...

1. The number of mole in 0.293 Kg of Pb is 1.42 mole

2. The number of atom in 0.293 Kg of Pb is 8.55×10²³ atoms

1. How to determine the number of mole

The numbe of mole in the 0.293 Kg of Pb can be obtained as follow:

Mole = mass / molar mass

Number of mole of = 293 / 207

Number of mole = 1.42 mole

Thus, the number of mole is 1.42 mole

2. How to determine the number of atoms

The number of atoms can be obtained as follow:

From Avogadro's hypothesis,

1 mole of Pb = 6.02×10²³ atoms

Therefore,

1.42 mole of Pb = (1.42 mole × 6.02×10²³ atoms) / 1 mole

1.42 mole of Pb = 8.55×10²³ atoms

Thus, the number of atoms is 8.55×10²³ atoms

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Give a succinct description of how the various alkene reactants were combined to create the same result. The most stable intermediate carbocation will arise as a result of an electrophilic proton addition in the reaction between HCl and both alkenes.

The observed product is produced in both cases by adding Cl- to the tertiary carbocation that is produced. By figuring out the physical properties of the reactants and products, negative entropy in chemical processes may also be calculated. Gas molecules are widely spaced apart and move randomly in all directions, which results in high entropy in gases. Being a liquid converting into a solid, water freezing into ice is an entropy-reducing process. Due to the molecules' reduced freedom of movement, a solid has less chaos. A negative entropy reaction occurs when hydrogen and oxygen combine to generate water.

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The statement that is not true of the reaction producing malonyl-coa during fatty acid synthesis is "one mole of ATP is converted to ADP Pi for each malonyl-coa synthesized." The reaction actually requires two moles of ATP for each malonyl-coa synthesized.
The statement that is not true of the reaction producing malonyl-CoA during fatty acid synthesis is: "It requires acyl carrier protein (ACP)." The other statements are accurate regarding the production of malonyl-CoA. In this reaction, acetyl-CoA carboxylase enzyme is involved, which requires biotin and CO2 (or bicarbonate), and converts one mole of ATP to ADP and Pi for each malonyl-CoA synthesized. This reaction is also stimulated by citrate. However, ACP is not required in this specific reaction; it plays a role in later steps of fatty acid synthesis.

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The [OH-] of the 0.025 M weak acid solution will be equal to the pKA of the acid, 4.615.
What is weak acid solution?
A weak acid solution is a solution that contains an acid that is not completely ionized in water. Weak acids, such as acetic acid, have pH values between 4.5 and 6.0. These acids are not strong enough to completely break apart in water, leaving some of the molecules still intact. Because of this, weak acids form molecules that can react with other molecules, such as bases, in solution.
This is because the equilibrium of the acid dissociation reaction is reached with the same concentration of acid and its conjugate base in solution. The [H3O] will be equal to 0.025 M, as the acid is in dissociation equilibrium with its conjugate base. The pH of the solution can be calculated by taking the negative log of the [H3O], which will be 1.59. The pOH can be calculated by taking the negative log of the [OH-], which will be 4.615.
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Explanation:

Q = mcT ...you can either substitute the molar heat capacity of water in the place of c or the specific heat capacity of water.

if you try specific heat capacity ...the change in temperature needs to be converted to celsius temperature inorder to cancel it out from the rearranged formula of m = Q/cT where T stands for change in temperature which is found by deducting the initial or first temperature from the 2nd.