how to find the electron in an atom/element

Answer:

Option B (combustion) is the correct approach.

Explanation:

Some other available scenarios have no connexons with the particular circumstance. So the obvious response to the above was its appropriate one.

The final pressure of the gas, when the volume is increased from 12.8 L to 25.6 L, can be calculated using Boyle's Law, which states that the pressure and volume of a gas are inversely proportional at constant temperature.

In the first scenario, the initial pressure is 0.987 atm and the initial volume is 12.8 L. The product of pressure and volume is constant (P₁V₁ = P₂V₂), so we can calculate the final pressure (P₂) using the equation:

P₂ = (P₁ * V₁) / V₂

Plugging in the values, we have:

P₂ = (0.987 atm * 12.8 L) / 25.6 L = 0.494 atm

Therefore, the final pressure of the gas, when the volume is increased to 25.6 L, is 0.494 atm. Hence, the correct answer is option c) 0.494 atm.

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Answer:

The interaction between the tectonic and the hydrologic systems causes constant recycling of the materials of the Earth's crust. Rocks are heated, metamorphosed, melted, weathered, sediment is transported, deposited and lithified, then it may be metamorphosed again in yet another cycle.

Explanation:

Answer:

water and salt

Explanation:

A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water. The neutralization of a strong acid and strong base has a pH equal to 7.

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The thing which changes the identity of an atom is the by adding or removing the protons from the nucleus will changes the charge of the nucleus and it changes that the atom's atomic number.

The number of the protons in an atom is equals to the atomic number of the atom. So,  by adding and removing the protons from the nucleus of atom will changes the charge of the nucleus and it changes that the atom's atomic number. The example is as : if we added a proton to the nucleus of the hydrogen atom and then it turns  the helium atom.

Thus by changing the number of the protons in an atom , the atoms identity will changes.

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Answer:

Almost everything in our surroundings represent chemical change

Explanation:

●Rusting of iron in presence of moisture and oxygen.

●Burning of wood.

●Milk becoming curd.

●Formation of caramel from sugar by heating.

●Baking of cookies and cakes.

●Cooking any food.

●Acid-base reaction.

●Digestion of food.

The mobile phase used in column chromatography to separate the product ester and excess reagent after a Fischer esterification should be a polar solvent.

This is because the product ester and excess reagent are both polar molecules, and so a polar solvent will be able to effectively separate the two components. Experimental analysis would need to be done to identify the proper conditions for such a separation. This could include testing different mobile phases with varying polarities, testing different amounts of silica gel, and testing different flow rates and column lengths. In addition, different retention times could be monitored and compared to identify the conditions that result in the most efficient separation of the product ester and excess reagent.

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Answer:

Explanation:

You can view more details on each measurement unit: molecular weight of Copper(I) Oxide or grams The molecular formula for Copper(I) Oxide is Cu2O. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Copper(I) Oxide, or 143.0914 grams.

Answer:

0.054 moles

Explanation:

It is the rounded off answer.

Answer:

The correct option is;

Waves that move through the Earth

Explanation:

In attempting to unravel the nature and arrangements of the rocks beneath the Earths surface, Geologist apply numerous methodologies including seismological field survey and analysis whereby the time of travel of natural (due to events such as earthquakes) or man made (during geological exploration) seismic wave are analysed to image the nature, composition and dynamism of the Earth's interior to find out the presence of geological faults or liquid layers as well as to predict the possible occurrence of future events within the Earth's crust in detail.

A type of evidence that geologists usually study is: B. waves that move through Earth.

Geology can be defined as the scientific study of the substances (both solid and liquid) and physical structure of planet Earth, including the processes through which they change over time.

A geologist refers to an expert or professional that studies geology. Some of the various type of evidence that geologists usually study are:

The different rock samples that are existing on the surface of planet Earth.

The mineral composition of the different layers of planet Earth.

The waves that move through planet Earth such as electromagnetic waves.

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The volume of dry hydrogen gas at standard atmospheric pressure (which is typically defined as 1 atm or 101.325 kPa) depends on the number of moles of hydrogen gas present. The ideal gas law, PV = nRT, relates the pressure (P), volume (V), number of moles (n), and temperature (T) of an ideal gas. Assuming standard temperature and pressure (0°C and 1 atm), one mole of any ideal gas occupies a volume of 22.4 L. Therefore, to find the volume of dry hydrogen gas at standard atmospheric pressure, we need to know how many moles of hydrogen gas we have.

For example, if we have 1 mole of dry hydrogen gas at standard atmospheric pressure, the volume would be 22.4 L. If we have 0.5 moles of dry hydrogen gas, the volume would be 11.2 L. And so on.

Answer:

filtration

Explanation:

1.put the mixture in a beaker

2.add water to the beaker and stir to dissolve salt

3.filter using a filter paper to have sand as the residue

4.Evaporate the water to remain with salt crystals

The two ways in which humans have negatively affected groundwater are Fertilizers and pesticides.

Fertilizers were chemical substances that are applied to crops in order to boost their yield.

Pesticides are chemicals that are being used to keep pests at bay. Herbicides, insecticides, nematicides, and molluscicides are examples.

Fertilizers and pesticides applied to the land, manure from livestock as well as other animals, landfills, mining operations, even unintended releases such as chemical spills or storage tank leaks are all factors that affect groundwater quality.

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B) Ca(OH)2 is a strong base.

In chemistry, a base is a substance that can accept hydrogen ions (H+) from an acid and form a salt and water. The strength of a base refers to its ability to accept hydrogen ions and is often measured by the base dissociation constant (Kb).

Strong bases have a high dissociation constant and dissociate completely in aqueous solution, while weak bases dissociate only partially.

Among the options listed, Ca(OH)2 is a strong base as it dissociates completely in water to form hydroxide ions (OH-) and can accept hydrogen ions from an acid. In contrast, Mg(OH)2 is also a base, but it is weaker than Ca(OH)2.

NH3 is an amphoteric compound that can act as either a base or an acid depending on the conditions, and CH3OH is a neutral compound that does not act as a base.

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Answer:

creo q es electrico

Explanation:

Answer:

They are broken down into glucose

Explanation:

After they are broken down, they will then be used to provide energy through metabolic pathways.

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Answer: A-Letter and word spacing is the best option.

Answer:

149.94J

Explanation:

According to specific heat capacity, 149.94 joules are needed to increase the temperature of 15.0 g of Fe from 20.0°C to 40.0°C .

Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.

It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.

It is given by the formula ,

Q=mcΔT

Substitution in above formula gives Q=15×0.4998×20=149.94 J.

Thus 149.94 Joules  are needed to increase the temperature of 15.0 g of Fe from 20.0°C to 40.0°C .

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The correct answer is (a). There is a Lewis structure for Ca2+ but it has no electrons.

This is because calcium loses two electrons to form a cation with a 2+ charge. The Lewis structure for Ca2+ would show an empty valence shell with no electrons around the calcium ion.

Calcium (Ca) is a metallic element located in Group 2 of the periodic table, meaning it has two valence electrons. When calcium loses both valence electrons, it becomes a cation with a 2+ charge, represented as Ca2+.

In a Lewis structure, each valence electron is represented by a dot. Since Ca2+ has lost both valence electrons, it has no dots or electrons left to represent in the Lewis structure. Therefore, option a is correct: There is a Lewis structure for Ca2+, but it has no electrons.

Option b is incorrect because having 4 electron pairs would suggest that Ca2+ has 8 valence electrons, which is not the case.

Option c is incorrect because having 1 electron pair would suggest that Ca2+ has 2 valence electrons, but as mentioned earlier, it has lost both of its valence electrons to become a 2+ cation.

Option d is also incorrect because having 2 electron pairs would again suggest that Ca2+ has 4 valence electrons, which is not true.

Option e is incorrect because having 1 electron pair would suggest that Ca2+ has only 2 valence electrons, but we know that it has lost both of its valence electrons to form a 2+ cation.

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Answer:

Wavelength = \(4.48*10^{-5}m\)

Explanation:

Given the following data;

Speed of light, V = 3 * 10^{8}m/s

Frequency, F = 6.700 * 10^{12}Hz.

To find the wavelength

We know that that the speed of light is given by the formula;

\( Speed of light, V = wavelength * frequency \)

Making wavelength the subject of formula, we have;

\( Wavelength = \frac {speed \; of \; light}{frequency} \)

Substituting into the equation, we have;

\( Wavelength = \frac {3 *10^{8}}{6.700 ✕ 10^{12}} \)

Simplifying the equation, we have;

Wavelength = 4.48*10^{-5} m

Therefore, the wavelength of the electromagnetic radiation is \(4.48*10^{-5} meters\)

The molecular formula of the compound is \(C_2H_3\).

To determine the molecular formula of the gaseous compound, we need to use the information given about its empirical formula and the time it takes to escape through a pinhole and apply the concept of the Ideal Gas Law.

The empirical formula of the compound tells us the simplest whole-number ratio of the atoms present in the molecule. In this case, the empirical formula is \(CH_2\), which means that the molecule contains one carbon atom and two hydrogen atoms.

The time it takes for gas to escape through a pinhole is related to its molar mass and the size of the hole. The lighter the gas, the faster it will escape. Therefore, we can compare the escape times of nitrogen gas and the compound to determine their relative molar masses.

Using the Ideal Gas Law, we can relate the molar mass of the compound to the time it takes to escape through the pinhole. Assuming the same conditions of temperature and pressure, the Ideal Gas Law states that PV=nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature. Rearranging this equation gives us n=m/M, where m is the mass of the gas and M is the molar mass.

We can use this equation to find the molar mass of the compound:

n = m/M

n = m/ (Empirical formula mass of \(CH_2\))

n = m/ (12.01 + 2*1.01)

n = m/ 14.03

We know that the time it takes for nitrogen gas to escape through the pinhole is 83.8 seconds, and the time for the compound is 68.4 seconds. Therefore, the ratio of their molar masses is:

(Molar mass of nitrogen gas) / (Molar mass of the compound) = (Time for the compound to escape) / (Time for nitrogen gas to escape)

(Molar mass of nitrogen gas) / (Molar mass of the compound) = 83.8 / 68.4

(Molar mass of nitrogen gas) / (Molar mass of the compound) = 1.2246

We know the molar mass of nitrogen gas is 28.01 g/mol, so we can solve for the molar mass of the compound:

28.01 / (Molar mass of the compound) = 1.2246

The molar mass of the compound = 22.87 g/mol

Now we can use the molar mass of the compound to find its molecular formula. The empirical formula mass of \(CH_2\) is 14.03 g/mol, so the molecular formula mass must be a multiple of this value that is close to 22.87 g/mol. Dividing 22.87 by 14.03 gives a value of 1.63, which suggests that the molecular formula contains approximately 1.63 times as many atoms as the empirical formula.

To find the molecular formula, we can multiply the empirical formula by this factor:

(\(CH_2\)) x 1.63 = C1.63H3.26

Rounding to the nearest whole number, we get the molecular formula \(C_2H_3\).

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Answer:

sun gives you vitamin D

Explanation:

Our body creates vitamin D from direct sunlight on our skin when we're outdoors.

If the color of the solution changes to purple after adding the biuret reagent, it indicates the presence of proteins (yes). If the color remains blue, it indicates the absence of proteins (no).

When performing a biuret test to determine the presence of proteins, you will observe the color of the solution after adding the biuret reagent to different samples. Here's a step-by-step explanation:

1. Prepare three samples: water (control), filtrate, and casein.
2. Add the biuret reagent to each sample.
3. Observe the color of each solution after a few minutes.

The color change you should look for is from blue to purple. If the solution turns purple, it indicates the presence of proteins.

- For the water (control) sample, you should not expect any color change since it does not contain proteins.
- For the filtrate sample, the color change depends on whether there are proteins present in the filtrate.
- For the casein sample, you should expect the solution to turn purple because casein is a protein.

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The given chemical equation can be balanced as: CH4 + 2O2 → CO2 + 2H2OTherefore, the balanced chemical equation for the reaction between 46 g of CH4 and 32 g of O2 is:CH4 + 2O2 → CO2 + 2H2OMoles of CH4 = (46 g)/(16.04 g/mol) = 2.87 molMoles of O2 = (32 g)/(32 g/mol) = 1 mol.

Moles of CH4 = (46 g)/(16.04 g/mol) = 2.87 molMoles of O2 = (32 g)/(32 g/mol) = 1 molFor the given reaction, one mole of CH4 reacts with 2 moles of O2. Therefore, 2.87 moles of CH4 would react with 2 × 2.87 = 5.74 moles of O2. As we can see from the given values, only 1 mole of O2 is present. Hence, O2 is the limiting reactant.The balanced chemical equation for the reaction between 46 g of CH4 and 32 g of O2 is:CH4 + 2O2 → CO2 + 2H2OOn

The basis of the balanced chemical equation, 2 moles of O2 is required for one mole of CH4. Here, the moles of O2 is lesser than 2 times the moles of CH4, which means O2 is the limiting reactant and CH4 is the excess reactant. Hence, 32 g of O2 will react completely with 1 mole of CH4, and 14.14 g of CO2 and 4 g of H2O will be produced as per the stoichiometry.

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Answer: B:Light moves in a straight line except at surfaces between different transparent materials, where its path bends.

Explanation:

9.14moles

According to the Avogadro's constant,

We are to determine the moles of 5.50 x 10^24 molecules of butane. This is expressed as:

Therefore the required mole of butane is 9.14moles

A daisy is a flowering plant, and a pine tree is a non-flowering, cone-bearing plant. During the adult stage, the daisy produces seeds in the flower and the pine tree produces seeds in the cone. So, the correct option is (A).

Cones are also called strobilus. It is oval in shape, containing the reproductive organs of some non-flowering plants. Cones have unique feature of pines and other conifers, also found on all gymnosperms, some club mosses and horsetails.

Male cones produce pollen that is carried by the wind to female cones, after which the female gametes are fertilized by male gametes from the pollen, the female cones produce seeds, which are then scattered away from the plant by wind or animals.

Thus, a daisy is a flowering plant, and a pine tree is a non-flowering, cone-bearing plant. During the adult stage, the daisy produces seeds in the flower and the pine tree produces seeds in the cone. So, the correct option is (A).

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An investigation is when you gather facts through observation, questioning, or studying.