What is the mass number of an oxygen isotope that has nine neutrons.

The kinetic energy of the alpha particle is equal to: B.\(7.47 \times 10^{-13}\;J\)

Given the following data:

Scientific data:

To calculate the kinetic energy of the alpha particle:

Mathematically, kinetic energy is calculated by using this formula;

\(K.E = \frac{1}{2} MV^2\)

Where:

Substituting the given parameters into the formula, we have;

\(K.E = \frac{1}{2} \times 6.642 \times 10^{-27}\times (1.5 \times 10^{7})^2\\\\K.E = \frac{1}{2} \times 6.642 \times 10^{-27}\times 225 \times 10^{14}\\\\K.E =6.642 \times 10^{-27}\times 1.125 \times 10^{14}\\\\K.E =7.47 \times 10^{-13}\;J\)

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The energy change that occurs when ice is added to the warm drink when a glass of water left in the sun becomes warm and Estella adds ice to the water to make it cool is that the water loses heat to the ice, causing the ice to melt.

The correct option is A.

Ice melts in warm water due to the transfer of heat energy from the water to the ice.

Heat flows from a warmer object to a cooler object until they reach thermal equilibrium, meaning they are at the same temperature. In the case of ice melting in warm water, the water is warmer than the ice, so heat flows from the water to the ice, causing the ice to melt.

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Answer:

is aluminium prepared in thin metal leaves with a thickness less than 0.2 mm (7.9 mils); thinner gauges down to 6 micrometres (0.24 mils) are also commonly used.[1] In the United States, foils are commonly measured in thousandths of an inch or mils. Standard household foil is typically 0.016 mm (0.63 mils) thick, and heavy duty household foil is typically 0.024 mm (0.94 mils). The foil is pliable, and can be readily bent or wrapped around objects. Thin foils are fragile and are sometimes laminated with other materials such as plastics or paper to make them stronger and more useful. Aluminium foil supplanted tin foil in the mid 20th century.

Hydrolysis occurs in an aqueous solution of FeCl3 salt, resulting in the formation of HCl. This powerful acid causes H+ ions to form in the solution. As a result, the resultant solution is acidic and becomes blue when litmus is added.

The inorganic chemical with the formula FeCl is known as iron(III) chloride. It is a common compound of iron in the +3 oxidation state and is also known as ferric chloride.

Ferrous chloride, sometimes referred to as iron(II) chloride, is a chemical compound with the formula FeCl. It has a high melting point and is a paramagnetic solid. Although normal samples are frequently off-white, the chemical is white.

Ferric sulphate and chloride. When combined with water, ferric salts hydrolyze similarly to aluminium salts but produce distinct hydrolysis products. The same variables that affect how well a coagulation occurs also apply to alum salts.

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Universe, Stars, Planets, Asteroids

Answer:

Universe, Stars, Planets, Asteroids

Explanation:

After that, the speeds of the molecules are calculated at the two different temperatures as given in the question and then, the ratio is calculated by dividing.

Here, T is the temperature,

         m is the mass of the molecules and

         R is the Gas constant.

Let's taken an example of the two temperatures are as follows:

\(T_{1}\)=270K

\(T_{2}\)=30K

We know that the root mean square speed of the molecules is given as:

 \(V_{rms} = \sqrt{\frac{3RT}{M} }\)

Putting the values of the temperatures and calculating the root mean square speeds of the molecules:

\(V_{rms1} = \sqrt[]{\frac{3R*270}{M} }\)

\(V_{rms2} = \sqrt{\frac{3R*30}{M} }\)

Dividing the above two root mean square speed equations in order to get the ratio of the two, we get,

⇒ \(\frac{V_{rms1} }{V_{rms2} } = \frac{\sqrt{\frac{3R*270}{M} } }{\sqrt{\frac{3R*30}{M} } }\)

⇒ \(\frac{V_{rms1} }{V_{rms2} } = \sqrt{\frac{9}{1} }\)

⇒ \(\frac{V_{rms1} }{V_{rms2} } = \frac{3}{1}\)

Hence, the ratio of the root mean square speeds of the molecules of an ideal gas at 270K and 30K is 3:1.

Note: It is important to note that the root-mean-square speed is the measure of the speed of particles in a gas, defined as the square root of the average velocity-squared of the molecules in a gas. The mass and the Gas constant values for a particular gas remain the same and only temperature is the variant.

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A nucleus maintains its stability despite being composed of positively charged particles due to the strong nuclear force that overcomes the repulsion between the protons.

The neutrons in the nucleus play a crucial role in maintaining stability. Neutrons have no charge and do not contribute to the electrostatic repulsion. Their presence helps to increase the attractive nuclear force, balancing the repulsive force between protons. This shielding effect allows the nucleus to remain stable.
Another important factor is that the Coulomb force, which describes the electrostatic repulsion between charged particles, is not applicable at the nuclear level. The range of the Coulomb force is limited, and its influence diminishes at very short distances inside the nucleus. Instead, the strong nuclear force takes over and becomes the dominant force, binding the protons and neutrons together.
Additionally, the surrounding electrons in an atom contribute to the nucleus's stability. Electrons are negatively charged and are located in the electron cloud surrounding the nucleus. Their negative charge helps neutralize the positive charge of the protons, reducing the overall electrostatic repulsion within the atom. This electron-proton attraction further contributes to the stability of the nucleus.

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Answer: 1. Endoplasmic Reticulum

Explanation:

it has passageways that carry proteins and other materials from one part of the cell to another

Ocean acidification results from oceans absorbing carbon dioxide. The buffering system then favors the formation of carbonic acid, thus lowering the ocean's pH

How basic or acidic aqueous or other liquid solutions are is determined by the pH scale. The expression transforms the hydrogen ion concentration, which typically falls within the range of 0 and 14, into values between 1 and 1014 gram-equivalents per litre. It is widely used in the disciplines of chemistry, biology, and agronomy. Pure water is neutral because it has a pH of 7, or 107 gram-equivalents of hydrogen ions per litre (neither acidic nor alkaline).

The quantity of hydrogen ions in an aqueous solution, expressed in equivalents per litre, is equal to log(H+). The pH of a soil is likely the most important factor affecting its moisture content in agriculture because it determines which crops will thrive there.

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Option C, a more saturated fat is the product(s) for the hydrogenation of corn oil.

Organic molecules are frequently reduced or saturated by the process of hydrogenation, which is a chemical reaction between hydrogen (H2) and another substance or element. The process of incorporating hydrogen molecules into the various carbon-carbon bonds is known as hydrogenation. Saturated fats emerge from this process. Double bonds change into single bonds throughout this Saturated fats, and the melting point steadily increases.

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pretty sure its d and g

just my opinion

The answer is B) Group 8 .

Answer:

I think it's B

But A seems a good answer too

It might be D

But Imma go for C

Explanation:

Answer:

Yes

Explanation:

3NaOH + H3PO4

3Na + 3O + 3H + 3H + P + 4O

3Na + 7O + 6H + P

Na3PO4 + 3H2O

3Na + P + 4O + 6H + 3O

3Na + 7O + 6H + P

Explanation:

so mass = moles × mr ( mr is 164)

so 4.76 × 164

which is 780.64 g

so to 3 s.f it is 780 g

hope this helps :)

The mass of C produced by the complete reaction of 10.0 g of A is 15.0 grams.

To determine the mass of C produced by the complete reaction of 10.0 g of A, we need to use the molar masses and the stoichiometry of the reaction.

Molar mass of C is twice the molar mass of A.

The reaction is 2A → 3C.

Let's start by finding the molar masses of A and C. Let's assume the molar mass of A is "M" g/mol. Therefore, the molar mass of C would be "2M" g/mol.

Using the molar masses, we can calculate the number of moles of A in 10.0 g of A:

Number of moles of A = Mass of A / Molar mass of A

= 10.0 g / M g/mol

= 10.0 / M mol

According to the stoichiometry of the reaction, 2 moles of A react to produce 3 moles of C. So, the number of moles of C produced can be calculated as follows:

Number of moles of C = (3/2) * Number of moles of A

= (3/2) * (10.0 / M) mol

To find the mass of C produced, we multiply the number of moles of C by its molar mass:

Mass of C = Number of moles of C * Molar mass of C

= [(3/2) * (10.0 / M) mol] * (2M g/mol)

= (3/2) * 10.0 g

= 15.0 g

Therefore, the mass of C produced by the complete reaction of 10.0 g of A is 15.0 grams.

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We determine the mass of C produced by the complete reaction of 10.0 g of A is 15.0 grams.

We know that molar mass of C is twice the molar mass of A.

The reaction is given as 2A → 3C.

we go ahead to  calculate the number of moles of A in 10.0 g of A:

Number of moles of A = Mass of A / Molar mass of A

Number of moles of A= 10.0 g / M g/mol

Number of moles of A= 10.0 / M mol

we do same for C according to the stoichiometry of the reaction:

Number of moles of C = (3/2) * Number of moles of A

Number of moles of C = (3/2) * (10.0 / M) mol

Mass of C = Number of moles of C * Molar mass of C

Mass of C  = [(3/2) * (10.0 / M) mol] * (2M g/mol)

Mass of C  = (3/2) * 10.0 g

Mass of C  = 15.0 g

In conclusion, the mass of C produced by the complete reaction of 10.0 g of A is 15.0 grams.

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The element that exists as a diatomic molecule in its most stable state is hydrogen (H).

In its most stable state, hydrogen exists as a diatomic molecule, meaning it naturally pairs up with another hydrogen atom to form H2. This is due to the electronic configuration of hydrogen, which consists of a single electron in its outermost shell. In order to achieve a more stable electron configuration, hydrogen shares its electron with another hydrogen atom, forming a covalent bond.

The formation of the H2 molecule involves the overlap of the two hydrogen 1s atomic orbitals to create a bonding molecular orbital. Each hydrogen atom contributes one electron to the bonding orbital, resulting in a stable H2 molecule with a filled bonding orbital.

The equation for the formation of the H2 molecule is as follows:

H + H → H2

Hydrogen (H) exists as a diatomic molecule, H2, in its most stable state. This diatomic form of hydrogen allows it to achieve a more stable electron configuration by sharing its single electron with another hydrogen atom through the formation of a covalent bond.

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Answer:

s1 to GS as the amount of energy required to remove the electron is greatest when it is closest to the nucleus.

Explanation:

Fun facts:

When the electron changes levels, it decreases energy and the atom emits photons. The photon is emitted with the electron moving from a higher energy level to a lower energy level. The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level.

Answer:

The answer is: S.1 to G.S

Hope this helpss :) <3

Explanation:

Based on the diagram, the statement explains how energy is conserved during this chemical reaction is the potential energy lost by the reaction suystem (B) is gained by the surroundings.

Those reactions in which eneregy is released during the whole process, because energy of product is less than the energy of reactants.

In the given diagram it is given that energy of the reactants are more as compare to the products, so the reaction is exothermic in reaction means heat is released during this reaction. This released energy will absorb by the surrounding of the reaction system to maintain the law of conservation of energy.

Hence, option (D) is correct.

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The statement that explains how energy is conserved during this chemical reaction is the potential energy lost by the reaction system (B) is gained by the surroundings.

The law of conservation of energy says that the energy of an isolated system never changed.

The energy neither be created nor destroyed.

Thus, the correct option is D. the potential energy lost by the reaction system (B) is gained by the surroundings.

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These are just a few factors that may have contributed to the severe floods in Selangor in December 2021. It is important to note that climate change is a complex issue with multiple interacting factors, and further analysis would be needed to fully understand the specific causes of this event.

The severe floods in Selangor in December 2021 can be attributed to several climate change factors. Here are three possible factors:

1. Increased precipitation: Climate change has been linked to more frequent and intense rainfall events. Rising global temperatures lead to increased evaporation, which in turn results in higher levels of atmospheric moisture. This can contribute to heavier rainfall and ultimately lead to more severe floods.

2. Changes in weather patterns: Climate change can disrupt established weather patterns, leading to shifts in rainfall distribution and intensity. This can result in prolonged periods of heavy rainfall or sudden, intense storms, both of which can contribute to flooding events.

3. Urbanization and deforestation: Human activities, such as urbanization and deforestation, can exacerbate the impact of flooding. Concrete surfaces in urban areas prevent rainwater from being absorbed into the ground, leading to increased surface runoff and a higher risk of flooding. Similarly, deforestation reduces the ability of forests to absorb rainfall and retain water, further increasing the likelihood of flooding.

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A molecule having four total electron groups around the central atom has three bonding electron groups and one nonbonding electron group. Its molecular structure is trigonal pyramidal.

One or more atoms are joined by covalent (chemical) bonds to form molecules. Atoms can be represented as circles with a nucleus at their center (consisting of protons and neutrons) and one or more concentric circles around them, which represent the "shells" or "levels" in which the electrons surrounding the atom's nucleus are located, along with markings indicating the electron at each level. The lowest unit into which a substance can be divided while still being the same substance is a molecule. It is composed of two or more atoms that are chemically bonded to one another.

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The number of moles in 3.20 x 10² formula units of calcium iodide is 0.053 moles.

The number of moles in the formula units of a substance is calculated by dividing the formula unit by Avogadro's number.

According to this question, 3.20 x 10² formula units are in calcium iodide. The number of moles is as follows:

no of moles = 3.20 x 10²² ÷ 6.02 × 10²³

no of moles = 0.53 × 10-¹

no of moles = 0.053 moles

Therefore, the number of moles in 3.20 x 10² formula units of calcium iodide is 0.053 moles.

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Answer:

The term "Battery"

Explanation:

Answer:

125 ohms

Explanation:

since they're parallel we do

1/total resistance = (1/250 ohms) + (1/250 ohms)

then you get 2/250 ohms

then you flip it so it's equal to total resistance/1

250÷2= 125

Once the water begins to boil, Carmen can expect a measurement of 100°C on the Celsius thermometer. Option b is correct.

At standard atmospheric pressure, water boils at 100°C, which is the boiling point of water. This is the temperature at which water changes from a liquid to a gas (water vapor) as it absorbs heat energy.

Option a (32°C) is the freezing point of water, while option c (212°C) and option d (373°C) are the boiling points of water at different pressure levels. However, at standard atmospheric pressure, the boiling point of water is 100°C. Hence option b is correct choice.

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The volume Naoh is required to reach the equivalent point is      L.

Equivalent point is  the point in the chemical reaction when there is acid or base to neutralize the solution. It is also known as stoichiometric point. The moles of the titrant is equal to the moles of the unknown concentration in the titration.

The volume of the nbr solution is 0.20m and  the concentration of nbr is 10ml. and concentration of the Noah is 0.10.so, here C1 is 0.20m and v1 is 0.010l and C2 is 0.10m .

 so putting all the value sin the expression,

                   C1 V1 = C2 V2

where C1 is the concentration of the acid ,c2 is the concentration of the base,V1 is the volume of the acid and V2 is the volume of the base.

                   V2=C1. V1 / C2

                        = 0.20 .0.010 /0.10

                        =          L of Naoh.

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The classification of the given compounds is as follows:

(a) lactose (C₁₂​H₂₂​O₁₁​) - non-electrolytes

(b) lactic acid (HC₃​H₅​O₃​) - weak electrolytes

(c) dimethylamine [(CH₃​)₂​NH] - weak electrolyte

(d) barium hydroxide Ba(OH)₂ - strong electrolytes

Electrolytes are substances that when in the molten or solution state conduct electricity and are decomposed by the direct current passing through them.

Electrolytes dissociate into the component ions when they are dissolved in water or in molten form. Some examples of electrolytes are acids and bases.

Strong electrolytes dissociate completely into one while weak electrolytes dissociate partially.

Non-electrolytes do not dissociate into ions in solution but remain as molecules. Some example of non-electrolytes is organic solvents.

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Answer:

2CO 2NO → 2CO2 N2 : Balanced

6CO2 6H2O → C6H12O6 : Unbalanced

H2CO3 → H2O CO2 : Balanced

2Cu O2 → CuO : Unbalanced

Explanation:

1.) 2CO 2NO → 2CO2 N2

2 Carbon 2

4 Oxygen 4

2 Nitrogen 2

The amount of atoms of each element on each side of the equation are the same therefore the equation is balanced.

2.) 6CO2 6H2O → C6H12O6 O2

6 Carbon 6

12 Oxygen 8

12 Hydrogen 12

The amount of oxygen atoms is different on both sides of the equation therefore the equation is not balanced.

3.) H2CO3 → H2O CO2

2 Hydrogen 2

1 Carbon 1

3 Oxygen 3

The amount of atoms of each element is the same on both sides of the equation therefore the equation is balanced.

2Cu O2 → CuO.

2 Cu 2

2 O 1

The amount of oxygen atoms is different on both sides of the equation therefore the equation is not balanced.