how many ml of 0.150 m ca(oh)2(aq) will be required to completely react with 150. ml of 0. 100 m h3po4(aq) solution.

Answer:

it talks about reality ..how animals and human came to existence and how they disappear ..this is evolution

the environment chooses those who best fit in it and others are selected ..as in die ..this is referred to as natural selection

and further in this theory .animals produce off springs who survive in the environment

Answer:What is the main idea of climates

Explanation:

The main idea of climates is that they are long-term patterns of weather conditions in a particular region. Climate is determined by various factors such as latitude, altitude, topography, ocean currents, and prevailing winds. These factors influence the amount of solar radiation received by a region, the distribution of temperature and precipitation, and the types of vegetation and animal life that can thrive in that area.

Climate is typically classified into different types based on temperature and precipitation patterns. The most commonly used classification system is the Köppen climate classification system, which divides climates into five major groups: tropical, dry, temperate, continental, and polar. Each group is further subdivided into more specific climate types based on additional factors such as seasonality and humidity.

Understanding climate is important for a variety of reasons. It helps us predict weather patterns and natural disasters such as hurricanes and droughts. It also plays a critical role in agriculture, water management, and energy production. Additionally, climate change has become an increasingly important topic in recent years as human activities have led to significant changes in global climate patterns.

The temperature 750 K in Celsius will be 477 °C whereas, in Fahrenheit scales, It will be 8907 °F.

A conversion factor is a number used to change one set of units to another, by multiplying or dividing. When a conversion is necessary, the appropriate conversion factor to an equal value must be used.

There are three temperature scales in use today, Fahrenheit, Celsius and Kelvin. Fahrenheit temperature scale is a scale based on 32 for the freezing point of water and 212 for the boiling point of water, the interval between the two being divided into 180 parts.

Scale of temperature is a methodology of calibrating the physical quantity temperature in metrology.

Empirical scales measure temperature in relation to convenient and stable parameters, such as the freezing and boiling point of water

Therefore, The temperature 750 K in Celsius will be 477 °C whereas, in Fahrenheit scales, It will be 890 °F.

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Answer:

See explanation

Explanation:

Even though the image is missing here but i believe that the other pancakes are at different temperatures. If this is the case, the pancake at the highest temperature will make the bottom pancake the warmest due to transfer of thermal energy.

The transfer of thermal energy between the hotter pancake and the bottom pancake occurs by conduction. Conduction is a mode of transfer of thermal energy that occurs when the two bodies are in close contact with each other.

After they have been touching for a while, the temperature of the bottom pancake increases while the temperature of the top pancake decreases since thermal energy is being transferred from the top pancake to the bottom pancake.

The information regarding the energy and the temperature should be explained below:

The following information should be considered:

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herbivore: cow

carnivore: lion

omnivore: bear

decomposer: water mold

Answer:

rabbit, kingfisher,lizard, fungi

Explanation:

hrbivore is an organism which feeds on plants. carnivore is also an organism that feeds on other organism. omnivore is also an organism that feeds on other organisms. Decomposers arsle organisms that recycle nutrients.

Answer:

(d)

Explanation:

The correct statement is the density of ice is less than that of water. Therefore, option D is correct.

Water has a higher density than ice because its molecules are more tightly packed. Don't be fooled by the fact that ice is a solid. Water expands as it freezes. As a result, ice has a higher volume than water.

Because the orientation of hydrogen bonds causes molecules to push farther apart, ice is less dense than water.

Other liquids' solid states are denser because the molecules pack together tightly as the kinetic energy (temperature) decreases. Although the hydrogen bonds in water ice are strong, their orientation causes molecules to push apart, lowering density.

Thus, option D is correct.

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Answer:

Mass = 160 g

Explanation:

Given data:

Number of moles of sodium hydroxide = 4 mol

Mass of sodium hydroxide = ?

Solution:

Formula:

Mass = number of moles × molar mass of sodium hydroxide

Molar mass of sodium hydroxide = 40 g/mol

Mass = 4 mol × 40 g/mol

Mass = 160 g

Answer:

b

Explanation:

Answer:

it is B hope I helped

=

Explanation:

One change in homes that could help save electrical energy is to replace all incandescent bulbs with LED bulbs.

There are different ways one can save electrical energy in their home. Some of them include:

LED bulbs are known as Light-Emitting Diode bulbs. They are energy-saving bulbs, although might be more expensive than their incandescent counterparts.

According to research, LED bulbs have the capacity to save up to 75% of energy compared to other bulbs. Thus, if anyone is looking to save electrical energy and they have incandescent bulbs at some lighting points, they will get very good results by replacing them with LED bulbs.

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Answer: One change in homes that could help save electrical energy is to replace all incandescent bulbs with LED bulbs. They are energy-saving bulbs, although might be more expensive than their incandescent counterparts.According to research, LED bulbs have the capacity to save up to 75% of energy compared to other bulbs. Thus, if anyone is looking to save electrical energy and they have incandescent bulbs at some lighting points, they will get very good results by replacing them with LED bulbs.Turning off all lights and electrical appliances when not in use. Reduction of electrical appliances. For tv, set brightness, contrast and enable power saving mode. These are two other ways to consume less energy in your home.

Explanation: I hope this helps

Answer:

no I don't listen to them

Answer:

I love his style of Nu Metal and the influence that metal has on his music ultimately. I feel like Zilla fans don't give SosMula enough props tho, he def puts the icing on the cake in every song

Explanation:

It is important to note that  terms "identical conformational isomers" and "enantiomers" are mutually exclusive, as identical conformational isomers have the same orientation of all atoms in space, while enantiomers have mirror-image orientation of all chiral atoms.

Identical conformational isomers: These are molecules that have same atomic connectivity but differ only in way their atoms are oriented in space. Enantiomers: These are mirror images of each other and are non-superimposable. They have the same chemical and physical properties, except for their interaction with plane-polarized light. Diastereomers: These are stereoisomers that are not mirror images of each other and have different physical and chemical properties. Structural isomers: These are molecules that have same molecular formula but differ in their atomic connectivity.

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a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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Answer:

From top to bottom coyote, crow, squirrel, then acorn

Explanation:

The coyote has the least amount of energy and its the biggest predator so it belongs at the top. The crows eat squirrels and the squirrels eat acorns.

Answer:

hahahh noob

Explanation:

Answer:

0.005km

Explanation:

you divide by thousand

The standard temperature and pressure conditions enthalpy is usually measured under are 1kPa and 273K (option A).

Enthalpy in thermodynamics is a measure of the heat content of a chemical or physical system.

Enthalpy is the sum of the internal energy and pressure times volume It can be calculated using the following formula:

H = E + P V

Where;

H = Enthalpy

E = internal energy

P = pressure

V = volume

However, the enthalpy of a substance is usually measured under standard temperature and pressure.

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Answer:

proteins and neutron.

Answer:

A

Explanation:

Answer:

R, the gas law constant, is a constant,

Solubility of gas is inversely proportional to temperature.

Solubility of gas ∝ 1/Temperature

That means as temperature increases the solubility gas goes on decreasing and vice versa.

But R is inversely proportional to temperature .

So Solubility ∝ R. (1/T ∝ R)

That means solubility of gas goes on increasing as R increases.

Step 2: Result

Result:

So from above conclusion the solubility of Oxygen in water increases that result into increasing R value.

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:

1. Muddy water

2. Salt water

3. Chocolate chip cookies

Explanation:

I did this

The chromatography experiment, the solvent front traveled a distance of 8cm, while the blue, pink, and orange substances traveled distances of 6cm, 5cm, and 4cm.

In a chromatography experiment, the distance traveled by the solvent front refers to the distance the solvent traveled from the starting point on the chromatography paper. In this particular case, the solvent front traveled a distance of 8cm.

During the experiment, different components or substances were separated based on their affinity for the stationary phase and the mobile phase. The substances of interest in this scenario are represented by blue, pink, and orange.

The blue substance traveled a distance of 6cm from the starting point, indicating that it had a moderate affinity for the mobile phase. The pink substance traveled a distance of 5cm, suggesting that it had a slightly lower affinity for the mobile phase compared to the blue substance. Lastly, the orange substance traveled a distance of 4cm, indicating that it had the lowest affinity for the mobile phase among the three substances.

These distances traveled by the substances provide valuable information about their relative polarities or molecular interactions with the mobile and stationary phases. By analyzing the relative distances traveled by the substances compared to the solvent front, researchers can gain insights into the chemical properties of the separated components.

In conclusion, in this chromatography experiment, the solvent front traveled a distance of 8cm, while the blue, pink, and orange substances traveled distances of 6cm, 5cm, and 4cm, respectively, indicating their varying affinities for the mobile phase.

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The binding energy for the formation of antimony-123 (Sb-123) is approximately 2.7206 × 10¹³ kJ/mol.

To calculate the binding energy for the formation of a specific nuclide, we need to consider the mass defect, which is the difference between the mass of the individual nucleons and the mass of the nucleus. The binding energy is related to the mass defect according to Einstein's famous equation E=mc², where E is the energy, m is the mass defect, and c is the speed of light.

The atomic mass of antimony-123 (Sb-123) is approximately 122.904216 amu (atomic mass units). To determine the mass defect, we compare this value to the sum of the masses of the individual nucleons (protons and neutrons). The atomic mass unit is defined as 1/12th the mass of a carbon-12 atom, which is equivalent to 1.66053906660 × 10⁻²⁷ kg.

The number of protons in an antimony-123 nucleus is 51 since antimony has an atomic number of 51. Therefore, the number of neutrons in Sb-123 would be 123 - 51 = 72, as the mass number (sum of protons and neutrons) is 123.

The total mass of 51 protons would be 51 amu, and the total mass of 72 neutrons would be 72 amu. Hence, the total mass of the individual nucleons is 51 amu + 72 amu = 123 amu.

The mass defect (Δm) is given by the difference between the mass of the nucleus (122.904216 amu) and the total mass of the individual nucleons (123 amu):

Δm = 123 amu - 122.904216 amu = 0.095784 amu.

To convert the mass defect from atomic mass units to kilograms, we multiply by the atomic mass unit constant (1.66053906660 × 10⁻²⁷ kg):

Δm = 0.095784 amu * (1.66053906660 × 10⁻²⁷ kg/amu) = 1.58849 × 10⁻²⁶ kg.

Finally, we can calculate the binding energy (E) using Einstein's equation E=mc², where c is the speed of light (2.998 × 10⁸ m/s):

E = (1.58849 × 10⁻²⁶ kg) * (2.998 × 10⁸ m/s)² = 4.5256 × 10⁻¹¹ J.

To convert the binding energy from joules to kilojoules per mole (kJ/mol), we need to consider Avogadro's number (6.022 × 10²³ mol⁻¹):

E = (4.5256 × 10⁻¹¹ J) * (1 kJ/1000 J) * (6.022 × 10²³ mol⁻¹) = 2.7206 × 10¹³ kJ/mol.

Therefore, the binding energy for the formation of antimony-123 (Sb-123) is approximately 2.7206 × 10¹³ kJ/mol.

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1/4  temperature must give Mass of nitrogen at 0°c heated so that both it volume and pressure will be double.​

To double both the volume and pressure of a given mass of nitrogen at 0°C, we can utilize the combined gas law, which relates the initial and final states of a gas. The combined gas law is expressed as:

(P1 * V1) / T1 = (P2 * V2) / T2

Where P1 and P2 are the initial and final pressures, V1 and V2 are the initial and final volumes, and T1 and T2 are the initial and final temperatures.

Since we want to double both the volume and pressure, we can set P2 = 2P1 and V2 = 2V1. Plugging these values into the combined gas law equation, we get:

(2P1 * 2V1) / T1 = P1 * V1 / T2

Simplifying the equation, we find:

4P1V1 = P1V1 / T2

Cancelling out the common terms, we have:

4 = 1 / T2

Rearranging the equation, we find:

T2 = 1 / 4

Therefore, to double both the volume and pressure of the given mass of nitrogen at 0°C, it must be heated to a temperature of 1/4 or 0.25 times its initial temperature.

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Answer:D

Explanation:

The solubility constant is\($6.4 \times 10^{-9}$\).

The equilibrium for the solubility of the salt, \($\mathrm{MgF}_2$\) is,

\($$\mathrm{MgF}_2(s) \stackrel{\mathrm{H} \cdot \mathrm{O}}{\rightleftharpoons} \mathrm{Mg}^{2+}(a q)+2 \mathrm{~F}^{-}(a q)$$\)

The solubility product constant for \($\mathrm{MgF}_2$\) is,

\($$K_{\text {吶 }}=\left[\mathrm{Mg}^{2+}\right]\left[\mathrm{F}^{-}\right]^2$$\)

The molar solubility of \($\mathrm{MgF}_2$\) is taken as x, the x moles of \($\mathrm{MgF}_2$\)is dissolved in one litre water to produce x moles of \($\mathrm{Mg}^{2+}$\)and 2x moles of \($\mathrm{F}^{-}$\).

\($\begin{array}{lccc} & \mathrm{MgF}_2(s) & \stackrel{\mathrm{H}_2 \mathrm{O}}{\rightleftharpoons} \mathrm{Mg}^{2+}(a q)+2 \mathrm{~F}^{-}(a q) \\ \text { Initial } & x & 0 & 0 \\ \text { Change } & & +x & +2 x \\ \text { Equilibrium } & x & 2 x\end{array}$\)

The solubility product constant for\($\mathrm{MgF}_2$\) is,

\($$\begin{aligned}K_{u p} &=\left[\mathrm{Mg}^{2+}\right]\left[\mathrm{F}^{-}\right]^2 \\&=(x)(2 x)^2 \\&=4 x^3\end{aligned}$$\)

Substitute the solubility of \($\mathrm{MgF}_2$\) as \($1.17 \times 10^{-3} \mathrm{~mol} / \mathrm{L}$\)in the above equation as shown below:

\($$\begin{aligned}K_{i p} &=4 x^3 \\&=4\left(1.17 \times 10^{-3}\right)^3 \\&=6.41 \times 10^{-9}\end{aligned}$$\)

The solubility constant is \($6.4 \times 10^{-9}$\).(using 2 significant figures).

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The limiting reactant in the reaction is Fe. 223.2 g of Fe reacts with oxygen gives 319.2 g of the product Fe₂O₃. Then, 6.5 g if Fe gives approximately 9.4 g of product. Hence, option C is correct.

The limiting reactant in a reaction is the reactant which is insufficient in amount and as soon as it is consumed, the reaction stops.

The reaction between Fe and O₂ is written as:

\(\rm 4Fe + 3O_{2} \rightarrow 2Fe_{2}O_{3}\)

Atomic mass of Fe = 55.8 g/mol

no.of moles in 6.3 g = 6.3/55.8 = 0.11

mass of oxygen molecule = 32 g/mol

no.of moles in 3.1 g = 3.1/32 = 0.098

3 moles of oxygen needs 4 moles of Fe. Hence, 0.098 moles needs 0.12 mole. But we have 0.11 only. Hence, Fe is the limiting reactant.

mass of 4 moles of Fe = 223.2 g

molar mass of Fe₂O₃ = 159.6 g/mol

mass of 2 moles = 319.2 g.

Then, mass of Fe₂O₃ produced from 6.3 g of Fe is:

( 6.3 × 319.2)/223.2 = 9 g.

Therefore, option C is correct.

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Answer:

D

Explanation:

The incorrect statement is (b): the value of q is positive in an endothermic process.

(a) Enthalpy is a state function, which means that it depends only on the initial and final states of a system and not on the path taken to get there.

(b) The value of q is negative in an endothermic process because heat is flowing into the system from the surroundings, which means that the surroundings are losing heat. By convention, q is positive when heat flows out of a system and negative when heat flows into a system.

(c) The value of q is positive when heat flows into a system from the surroundings, which means that the system is gaining heat.

(d) Heat flows from the surroundings into a system in an endothermic process, which means that the system is absorbing heat from the surroundings.

(e) Internal energy is a state function, which means that it depends only on the initial and final states of a system and not on the path taken to get there.

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Answer:The law of conservation of matter says that matter cannot be created or destroyed. In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. ... There are two oxygen atoms in the reactants and two atoms of oxygen in the product.

Explanation:

The percent yield for this reaction is 50.8%.

First, we need to determine the moles of p-phenetidine used:

Moles of p-phenetidine = mass / molar mass

Moles of p-phenetidine = 6.48 g / 137.18 g/mol

Moles of p-phenetidine = 0.0472 mol

Since p-phenetidine is the limiting reagent, the moles of acetophenetidin produced should be equal to the moles of p-phenetidine used.

The theoretical yield of acetophenetidin can be calculated using the stoichiometry of the reaction:

Theoretical yield = Moles of p-phenetidine × (molar mass of acetophenetidin / molar mass of p-phenetidine)

Theoretical yield = 0.0472 mol × (179.22 g/mol / 137.18 g/mol)

Theoretical yield = 0.0616 mol

Now we can calculate the percent yield:

Percent yield = (actual yield / theoretical yield) × 100

Percent yield = (5.72 g / (0.0616 mol × 179.22 g/mol)) × 100

Percent yield = (5.72 g / 11.2512 g) × 100

Percent yield = 50.8%

Therefore, the percent yield for this reaction is 50.8%.

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