Which statement describes the earliest model of the atom?A.An atom is an indivisible hard sphere.B.An atom has a small, dense nucleus.C.Electrons are negative particles in an atom.D.Electrons in an atom have wave-like properties.

Answer: 0.245 m/s

Explanation:

So velocity = d/t or distance over time in this case m/s or meters per second. But BE CAREFUL you must remember to convert cm to m always so 135 cm= 1.35m and 1.35m/5.5s= 0.245m/s

Answer: saturated

Explanation: i am right.

The concentration of the new solution is 0.003 M.

Required concentration of the final solution will be calculated by using the below equation as:

M₁V₁ = M₂V₂, where

M₁ & V₁ are the molarity and volume of initial solution.

M₂ & V₂ are the molarity and volume of final solution.

On putting values from the question, we get

M₂ = (0.75)(2) / (500) = 0.003 M

Hence required concentration is 0.003M.

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Acid has a pH below 7 while water has a pH of 7. A strong acid with a pH of roughly 3, HCl is. Water gets more acidic and loses pH in the range of 4-5 when HCl is added to it.

A substance's pH is a gauge of how basic or acidic it is. It is a measurement of the amount of H+ present in the solution. It is equivalent to the negative logarithm of the concentration of H+ ions mathematically.

A solution is acidic if its pH value is less than 7, and basic if it is greater than 7. Acids have a lower pH because they contain more H+ ions. Strong acid hydrochloric acid has a pH between 2 and 3.

Water has no charge. Water becomes acidic in pH if any acid is introduced. Therefore, if HCl is given to water, the pH of the water will change to 3-5 depending on the acid content.

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Answer:

2. 1 gram of Uranium (U)

Explanation:

1.

1 g Be x 1 mol/ 9.012182 g = 0.1109609193 mol Be

0.1109609193 mol Be x 6.0221409e+23/ 1 mol = 6.68x10^22 atoms of Be

2.

1 g U x 1 mol/ 238.0289 g = 4.20117053x10^-03 mol U

4.20117053x10^-03 mol U x 6.0221409e+23/ 1 mol = 2.53x10^21

3.

1 g S x 1 mol/ 32.066 g = 0.03118567954 mol S

0.03118567954 mol S x 6.0221409e+23/ 1 mol = 1.88x10^22

4.

1 g Fe x 1 mol/ 55.847 g = 0.01790606478 mol Fe

0.01790606478 mol Fe x 6.0221409e+23/ 1 mol = 1.078328451x10^22

Answer:

a. .125 mol b. 7.25g

Explanation:

a. To get the moles multiply the volume by the molarity.

.5L*.25M=.125mol NaCl

b. The molar mass is provided so multiply the moles by the molar mass to get the amount of grams of nacl.

.125mol*58molar mass=7.25g nacl to make the solution

On a rock in coastal Maine, the fungus, the algae, and the bacteria make up part of an ecosystem.

An ecosystem consists of all the organisms and the physical environment with which they interact.

In the yellow scale lichen, the fungus provides protection, moisture, and nutrients for the algae. The algae carry out photosynthesis to produce food that is used by the fungus.

Ecosystem function is generally described as the capacity of natural processes and components to provide goods and services that satisfy human needs, either directly or indirectly.

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The  statement that  is correct about the rate of most chemical reactions is  :

It increases when the temperature increases.

Therefore option C  is correct

A chemical reaction is described as  a process that leads to the chemical transformation of one set of chemical substances to another.

The types of Chemical Reactions are highlighted below:

Synthesis reactions.

Decomposition reactions.

Single-replacement reactions.

Double-replacement reactions.

In conclusion,  Chemical reactions involve breaking chemical bonds between reactant molecules (particles) and forming new bonds.

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Answer: 0.79

Explanation:

Answer: 0.79

Explanation:

The amount of water that crystallises is 305.1%.

Crystalization is a process of separating solid particles from a solution. It occurs when a solvent, such as water, is mixed with a solute, such as salt or sugar.The percentage of water of crystallization in 35.7g Na₂CO₃ 10 H₂O can be calculated using the following equation:

Percentage of water of crystallization =\((\frac{Mass of water of crystallization}{Mass of anhydrous salt}) * 100\)

Mass of water of crystallization = 10 * (18.015 g/mol) = 180.15 g

Mass of anhydrous salt = (2 * (22.99 g/mol) + 1 * (12.01 g/mol)) = 58.97 g

The percentage of water of crystallization =\((\frac{180.15 g}{58.97 g}) * 100 = 305.1 \%.\)

Therefore,The percentage of water of crystallization is 305.1%.

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If one does not observe any difference in the TLC after 20 minutes, it shows that the reaction was not carried out or did not take place.  In such a case, one should repeat the reaction under optimal conditions.

In such a case, you should consider rechecking the reaction or the analytical technique used. This situation suggests that the reaction may be unsuccessful due to a technical issue such as failure to provide necessary conditions for the reaction to occur. It may also imply that the reaction being analyzed did not undergo any significant transformation, hence no difference was observed.

One can solve this problem by changing the solvent and considering the pH of the solution to provide optimal conditions for the reaction to occur. A more sensitive analytical method could also be employed to detect small changes or differences. The primary cause of the orange color is impurities present in the product, which are subsequently reduced to form the final product through sodium bisulfite treatment. When cooled, if no crystals form, it indicates that the product did not form, and the reaction did not take place.

This can result from an incorrect ratio of reactants, the purity of reagents, or incorrect reaction conditions. In such a case, one should repeat the reaction under optimal conditions.

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Answer:

Option D: nitrogen waste

Explanation:

Excretion.

This is removal from of waste products of chemical reactions. It involves the eliminating excess water and salts taken in with our human diet and also spent hormones

Nitrogenous waste products are the human waste products which contain nitrogen and are poisonous to the body.

The kidneys is responsible for the remove of Nitrogenous waste, water, salts, toxins, hormones e. t. c. It is the are the main principle excretory organs. They maintain the constant concentration of materials in the body.

Enthalpy change of mixing refers to the energy change during the formation of an ideal solution. Volume change of mixing relates to the change in volume resulting from the mixing process.

Enthalpy is a thermodynamic property that represents the total heat content of a system at constant pressure. It encompasses both the internal energy of the system and the work done by or on the system. Enthalpy is denoted by the symbol "H" and is typically measured in units of energy, such as joules (J) or calories (cal). Enthalpy accounts for the energy transferred as heat during chemical reactions or phase changes. Enthalpy is crucial in studying and analyzing various phenomena, including chemical reactions, phase transitions, and energy transfers in thermodynamic systems.

Volume change of mixing, on the other hand, relates to the change in volume resulting from the mixing process. It accounts for the variation in molecular interactions and the resulting effects on the overall volume of the mixture compared to the volumes of the individual components.

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Answer:

A

Explanation:

compare it to carbon 12 I believe

Answer:

Ions are atoms that have either gain or lose electrons from the neutral atom.

A loss of electrons results in a positive ion, called a cation, a gain of electron results in a negative ion called an anion.

Ionic compounds are formed by the combination of a cation and anion, or metal + nonmetal.

When naming ionic compounds, name the cation first, and the anion second, changing the ending to ide.

Explanation:

Hope it helped!

Answer:

• [ lost ] or [ gained ]

• [ cation ], [ anion ]

• [ metal ] + [ non-metal ]

• [ cation ] and the [ anion ] to [ compound with suffix "ide" or "ode" ]

Answer:

a

Explanation:

The heat capacity of a substance is the heat energy required to rise its temperature per one degree Celsius. Hence its unit is J/°C.

Heat capacity is the amount of heat energy required to raise the temperature of a substance by 1 degree Celsius or 1 Kelvin. It is expressed in the following units:

Joules per degree Celsius (J/°C)

Joules per Kelvin (J/K)

Calories per degree Celsius (cal/°C)

Calories per Kelvin (cal/K)

Joules per gram per degree Celsius (J/(g·°C))

Joules per gram per Kelvin (J/(g·K)) etc.

If in terms of simply the energy, then, The following units are used.

Joules (J) , Calories (cal) , Degrees Celsius (°C), Kelvin (K)

The choice of unit depends on the specific application and the system of units being used. The SI unit for heat capacity is J/K, while the traditional unit is cal/°C.

The use of per gram units is common in the context of specific heat capacity, which is the amount of heat energy required to raise the temperature of a unit mass of a substance by 1 degree Celsius or 1 Kelvin.

Therefore, here, the unit of heat capacity is J/°C.

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Answer:3

Explanation:

Answer:

Im pretty sure its Combustion

Answer:

B. False

Explanation:

All the atoms of an element are not entirely the same no matter where they are found.

The phenomenon of isotopy brings a different perspective to the identity of an element.

Answer:

Pull with less force, Add an apple to the basket, and Roughen the surface of the table to increase friction

Explanation:

I'm sorry I meant all organisms

Fe(C 5H 5) 2 describes the organometallic compound ferrocene. The molecule is a complex made up of a core iron atom and two cyclopentadienyl rings.

AlCl3 is the chemical formula for aluminum chloride, sometimes referred to as aluminum trichloride.

Acetic acid is the source of the acyl chloride known as acetyl chloride.  AcCl is a frequent way to shorten its formula.

"81.3%"

One mole of ferrocene combines with one mole of acetyl chloride in accordance with the reaction's stoichiometry to produce one mole of mono acetylferrocene.

The limiting reagent is the one that is minimally present. Ferrocene is the limiting agent as a result.

The limiting reagent controls how the product is formed. So,

In a reaction, one mole of ferrocene yields one mole of mono acetylferrocene.

reaction forms with 0.0005375 moles of ferrocene Mono acetylferrocene, 0.0005375 mole

0.0005375 moles of product were produced.

Mono acetylferrocene's molar mass is 228.07 g/mole.

Produced mono acetylferrocene mass equals moles times molecular weight, or 0.0005375 x 228.07 g, or 0.123 grammes, or 123 mg.

assuming a 100 mg experimental yield

% yield is equal to (Experimental Yield / Theoretical Yield) / 100, which equals (100/ 123) / 100, or 81.3%.

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Answer:

green house gas

Explanation:

decay rate of approximately 1.69x10^17 Bq (becquerels),

The decay rate of a radioactive sample is determined by the number  of radioactive atoms present and the decay constant, which represents the probability of decay per unit of time.

To calculate the decay rate, we multiply the number of atoms in the sample by the decay constant. In this case, the sample has 8.31x10^17 atoms and a decay constant of 0.203/s. Multiplying these values gives a decay rate of approximately 1.69x10^17 Bq (becquerels), which represents the number of decays per second in the sample.

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Answer:

one is across

Explanation:

The unknown metal X is iron metal as it reacts with copper sulfate solution but does not react with magnesium chloride.

Some metals are very reactive while other metals are less reactive or unreactive. When a more reactive metal is added to the solution of a less reactive metal, then the more reactive displaces the less reactive metal from its solution is known as a displacement reaction.

The general form of a single displacement reaction can be represented as:

\(A + BC \longrightarrow B + AC\)

When iron is placed in copper sulfate (CuSO₄) solution then the blue color of the copper sulfate solution turns a red-brown coating of copper metal deposited on the iron.

\(CuSO_4 (aq)+ Fe (s)\longrightarrow FeSO_4 (aq) +Cu(s)\)

Iron lies above the electrochemical series and is more reactive than copper. So it reacts with copper sulfate but does not give any reaction with magnesium chloride.

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1) The temperature of the egg at time t can be calculated using the equation T(t) = 18 + 80 * e^(-0.168t), where t is the time measured in minutes.

2) The realistic domain of the temperature function is t ≥ 0, meaning time cannot be negative.

3) A rough analysis of the temperature function shows an exponential decay curve starting at 98°C and approaching 18°C asymptotically. There is an intercept at t = 0, corresponding to the initial temperature of 98°C.

4) It takes approximately 18.17 minutes for the egg to cool to a temperature of 20°C.

1.

To solve for T(t), we can use the formula derived from Newton's Law of Cooling:

T(t) - Ts = (T0 - Ts) * e^(-kt)

Given the initial conditions:

T0 = 98°C (initial temperature of the egg)

Ts = 18°C (surrounding temperature)

T(5) = 38°C (temperature of the egg after 5 minutes)

We can substitute these values into the equation:

T(5) - 18 = (98 - 18) * e^(-5k)

20 = 80 * e^(-5k)

Dividing both sides by 80:

1/4 = e^(-5k)

Take the natural logarithm of both sides:

ln(1/4) = -5k

Solving for k:

k = -ln(1/4) / 5 ≈ 0.168

Now we have the value of k. We can substitute it back into the equation to get the temperature function:

T(t) - 18 = (98 - 18) * e^(-0.168t)

Simplifying further:

T(t) = 18 + 80 * e^(-0.168t)

2.

The realistic domain of the temperature function is t ≥ 0 since time cannot be negative.

3.

Analyzing the function:

The function is exponential decay, starting at 98°C and approaching 18°C asymptotically. There is an intercept at t = 0, where the temperature is 98°C. As time progresses, the temperature decreases and approaches 18°C. However, it never reaches exactly 18°C due to the exponential decay nature of the function.

4.

To find the time it takes for the egg to cool to a temperature of 20°C, we can substitute T(t) = 20 and solve for t:

20 = 18 + 80 * e^(-0.168t)

2 = 80 * e^(-0.168t)

Dividing both sides by 80:

1/40 = e^(-0.168t)

Taking the natural logarithm of both sides:

ln(1/40) = -0.168t

Solving for t:

t = -ln(1/40) / (-0.168) ≈ 18.17 minutes

Therefore, it takes approximately 18.17 minutes for the egg to cool to a temperature of 20°C.

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Answer:

10

Explanation:

Atomic number = No. of protons

Therefore, the number of protons of an element with an atomic number of 10, is also 10.

The vapor pressure of a solution prepared by mixing 25 grams of methanol and 75 grams of ethanol at 20 degrees Celsius can be calculated using Raoult's law, which states that the vapor pressure of a component in a solution is directly proportional to its mole fraction.

To calculate the vapor pressure of the solution, we need to use Raoult's law, which is expressed as:

\(P_{total}\)= \(P_A\) ×   \(x_A\) +\(P_B\) ×   \(x_B\)

Where \(P_{total}\) is the vapor pressure of the solution, \(P_A\) and \(P_B\) are the vapor pressures of the individual components (methanol and ethanol in this case), and  \(x_A\) and  \(x_B\) are their respective mole fractions.

First, we need to calculate the mole fractions of methanol ( \(x_A\) ) and ethanol ( \(x_B\)) in the solution. To do this, we need to convert the masses of methanol and ethanol into moles using their molar masses. The molar mass of methanol \((CH_3OH)\) is 32.04 g/mol, and the molar mass of ethanol \((C_2H_5OH)\) is 46.07 g/mol.

Moles of methanol = 25 g / 32.04 g/mol

Moles of ethanol = 75 g / 46.07 g/mol

Next, we calculate the mole fractions:

\(x_A\) = Moles of methanol / (Moles of methanol + Moles of ethanol)

\(x_B\) = Moles of ethanol / (Moles of methanol + Moles of ethanol)

Now that we have the mole fractions, we can substitute them into Raoult's law to calculate the vapor pressure of the solution:

\(P_{total}\) = 92 torr × \(x_A\) + 45 torr ×  \(x_B\)

Substituting the calculated values of \(x_A\) and \(x_B\) will give us the vapor pressure of the solution at 20 degrees Celsius.

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The Reactive metals typically have outer electron configurations that allow them to easily lose electrons in chemical reactions. The configurations you provided are ns2np6. ns2np5 ns2np 4ns1 ns2np6 This configuration represents a noble gas, which has a full outer electron shell.

The Noble gases are stable and generally unreactive due to their complete valence electron shells. ns2np5 This configuration represents a halogen, which has 7 valence electrons. Halogens are very reactive non-metals, as they tend to gain an electron to complete their outer shell. ns2np4 This configuration represents a non-metal from group 16 (chalcogens) with 6 valence electrons. These elements tend to gain two electrons to complete their outer shell, making them reactive non-metals.4ns1 This configuration represents an alkali metal from group 1, which has 1 valence electron. Alkali metals are highly reactive metals because they can easily lose their single outer electron to achieve a stable electron configuration. Based on this analysis, the outer electron configuration that belongs to a reactive metal is ns1.

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