What type of reaction occurs when two hydrogen atoms collide at high speed, combining together into a helium atom?
Alpha decay
Beta decay
Fission
Fusion

Answer:

D

Explanation:

Answer:

Explanation:

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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

Among the given options, the strongest base is option (C) H2S.

The strength of a base is determined by its ability to accept protons (H^+) or donate electron pairs. In this case, we are comparing PH3 (phosphine), HCl (hydrochloric acid), and H2S (hydrogen sulfide) as potential bases.

PH3 (phosphine) is a weak base because it has a lone pair of electrons that can accept a proton, but it does so to a limited extent. It is not as capable of accepting protons as other bases.

HCl (hydrochloric acid) is not a base but an acid. It donates protons (H^+) and is therefore considered a strong acid rather than a base.

H2S (hydrogen sulfide) is a stronger base compared to PH3. It has a lone pair of electrons on the sulfur atom, which readily accepts protons, making it a better proton acceptor. H2S can act as a weak acid by donating protons but is a stronger base by accepting protons.

Therefore, among the options given, H2S is the strongest base because it has a greater tendency to accept protons compared to PH3 and HCl.

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Answer:

F=500×3 = 1500 N

W = 1500×10 =15000 Nm

Answer:

The correct option is;

He argued that Earth rotates on its axis

Explanation:

The hypothesis that the Sun is at the center of the universe and the Earth, the other planets and other heavenly bodies are revolving around the Sun was first proposed by Aristarchus of Samos who also believed that the motion of the stars where actually due to the rotation of the Earth about its axis

However, the propositions where rejected at the time because it was contrary to perception and senses such that a revolving Earth has to have a moving "great wind" in the air around us

Aristarchus's explanation of the movement of objects in the sky was different from that of other scientists because he argued that Earth rotates on its axis.

The solar system was deeply studied by the early astronomers. Each of them offered an explanation for the movement of objects in the sky. Some of these postulations were inconsistent with scientific evidence.

However, Aristarchus postulated that the sun is at the center of the solar system and that the earth and other planets move round the sun in orbits.

Hence, he suggested that the sun and not the earth was at the center of the solar system.

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Answer:

the rocks in location 2 are permeable.

Answer:

Consider your personal preferences first because the colors you use in your home need to reflect those preferences as well as fit in with your lifestyle.

Light has an influence over the colors that can make them look stunning as well as dull. Different types of light sources such as incandescent, fluorescent, halogen, or LED will affect the way a color appears.

The orientation of the room such as the direction it faces or how much natural or artificial light is available can also affect how colors will appear in the room. So, consider the room specifications as well.

Consider fixed as well as furnished elements and accessories as they too have color. Take them into consideration to ensure that camouflaging or clashing doesn’t happen.

Consider the texture of walls whether they are smooth, rough, or in between. The texture will change the appearance of the color. Smooth walls will appear lighter while rough walls will appear darker.

Consider the kind of mood you want to set in a particular room. Different colors as well as their hues and combinations emote different feelings.

Consider the finishing if the paint whether to use gloss, semi-gloss, or satin to name a few. The finish of the t will have a lot to do with the final look of your color.

Ernest Rutherford’s model of the atom, first proposed in 1911, is one of the most important discoveries in the history of science. This model of the atom was revolutionary, as it improved upon J.J. Thomson’s “plum pudding” model and established a new understanding of the structure of the atom.

Rutherford’s model of the atom proposed that the atom was composed of a small, positively charged nucleus surrounded by negatively charged electrons. This structure was in contrast to Thomson’s model, which proposed that the atom was a homogeneous “plum pudding” composed of positive and negative charges. Rutherford’s model also proposed that the electrons orbited the nucleus in a manner similar to the way planets orbit the sun in the solar system, although the electrons did not have set orbits.

Rutherford also established that the alpha-particles (helium nuclei) are four times as heavy as a hydrogen atom. This discovery was made through the famous Gold Foil Experiment, in which Rutherford and his team of scientists sent alpha particles through a thin sheet of gold foil. The results of this experiment led Rutherford to conclude that the atom was not homogeneous.

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The correct Lewis dot structure for \(BeH_2\) is Be : H : H

The Lewis dot structure shows the valence electrons as dots. The valence electrons of beryllium are shown as 2 dots on the left side of the atom.

The central atom, beryllium, has 2 valence electrons where each hydrogen atom has 1 valence electron. To form a stable molecule, beryllium shares its 2 valence electrons with the 2 hydrogen atoms, each of which shares its 1 valence electron with beryllium which gives each atom a full outer shell of electrons.

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Answer:

The muscular system is composed of specialized cells called muscle fibers. Their predominant function is contractibility. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body is the result of muscle contraction.

\(\huge\star{\underline{\mathtt{\red{A}\pink{N}\green{S}\blue{W}\purple{E}\orange{R}}}}\star\)

The muscular system is composed of specialized cells called muscle fibers.

Their predominant function is contractibility. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement.

Nearly all movement in the body is the result of muscle contraction.

The equilibrium expression for the reaction given in the question is:

[H₂]⁴ / [CH₄][H₂O]²

Equilibrium constant, K for a given chemical reaction is written as illustrated below:

nReactant ⇌ mProduct

Equilibrium constant (K) = [Product]ᵐ / [Reactant]ⁿ

Where

Note: The above equation only applies to gaseous reactants/products and aqueous reactants/products

With the above information in mind, we shall determine the equilibrium expression for the reaction. Details below:

Equilibrium expression = [Product]ᵐ / [Reactant]ⁿ

= [H₂]⁴ / [CH₄][H₂O]²

Thus, we can conclude that the equilibrium expression is [H₂]⁴ / [CH₄][H₂O]²

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Explanation:

All you have to do is use the mole cocept

Answer:

+ 3

Ex planation:

Al3+ indicates an ion of aluminum having a charge of + 3. I.e., since an aluminum atom normally has 13 protons and 13 electrons, this ion has 10 electrons (-10 charge) and 13 protons (+ 13 charge) giving it a charge of + 3 (-10 + 13 = +3).

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The correct statement about pericyclic reactions is:

In pericyclic reactions, all bonds are broken and formed in a single step.

Pericyclic reactions are a class of organic reactions characterized by the simultaneous breaking and forming of multiple bonds in a concerted manner, meaning that all bond changes occur in a single step. This is in contrast to stepwise reactions where bonds are broken and formed in separate steps.

In a pericyclic reaction, the reactants rearrange their electrons in a concerted fashion, leading to the formation of new bonds and the breaking of existing bonds. This concerted process occurs through the overlap of molecular orbitals, allowing for the efficient transfer of electrons.

Pericyclic reactions are concerted reactions in which the breaking and forming of bonds occur simultaneously in a single step. They do not involve multiple steps or intermediates. The transition state in a pericyclic reaction is cyclic, not acyclic.

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Aqueous potassium chloride reacts with calcium nitrate  to deliver calcium chloride and potassium nitrate.

Every the goods shaped are soluble in water. therefore all the ions stay within the aqueous medium, therefore this isn't a metathesis reaction.

Calcium chloride is an ionic compound used for the treatment of hypocalcemia and hyperkalemia, and as an antidote to magnesium intoxication because of overdosage of magnesium sulfate. Calcium chloride is an ionic compound of calcium and chlorine. it is highly soluble in water and it is deliquescent.

Remedy with meals grade calcium chloride lets in enlarge the shelf existence of a widespread form of food products at the same time as preserving desirable texture and flavor homes. it is used in salt processing to feature a salty flavor to pickles and other ingredients with out developing sodium content.

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The oxygen atom is sp3 hybridized in dialkyl ethers. In dialkyl ethers, the oxygen atom forms two sigma bonds with the two alkyl groups that are linked to it as well as two lone electron pairs.

As a result of hybridizing oxygen's one s orbital and three p orbitals, these four electron pairs now occupy four equivalent hybrid orbitals.

Resulting sp3 hybrid orbitals have bond angles of approximately 109.5° and are orientated in a tetrahedral configuration. Due to this hybridization, the oxygen atom may effectively establish covalent bonds with the two alkyl groups, resulting in a molecular structure that is stable.

Stability and reactivity of these compounds are greatly influenced by sp3 hybridization of the oxygen atom in dialkyl ethers.

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Answer:

The correct answer is quantitative data.

Explanation:

The value of data in the form of numbers of counts where each set of data exhibits a specific numerical value associated with it is termed as quantitative data. This information refers to any quantifiable knowledge, which can be used for statistical analysis and mathematical calculations so that decisions of real-life can be taken based on the mathematical outcomes. The quantitative data is used to find the solutions of the queries like how often, how much, or how many.  

In the given case, a botanist measured the growth of the plant for two weeks, and the outcome came in the form of numerical value. Thus, the knowledge she collected is known as quantitative data.  

The volume of the mineral piece in cubic centimeters (cm³), given that it takes 2.0 mL of space in graduated cylinder is 2.0 cm³

To obtain the volume of the mineral piece in cubic centimeters (cm³), we must convert 2.0 mL to cubic centimeters (cm³).

This can be obtained as illustrated below:

We can convert 2.0 mL to 2.0 cm³ as shown below:

From conversion scale identity,

1.0 mL = 1.0 cm³

Therefore,

2.0 mL = 2.0 cm³

From the above illustration, we can conclude that the volume (in cm³) is 2.0 cm³

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Answer:.

Explanation:

Answer:

1. Molecular weight = 333.3 g/mol

2. Strenght = 2222.2 mg/L

Explanation:

First, we need to find molarity (M) from normality (N) as follows:

\( N = nM \)      

Where n is the number of OH⁻ = 2

\( M = \frac{N}{2} = \frac{0.03}{2} = 0.015 mol/L \)

Now, when the H₃X solution is neutralized with Ca(OH)₂ we have:

\(\eta_{H_{3}X} = \eta_{Ca(OH)_{2}} = M_{Ca(OH)_{2}}*V_{Ca(OH)_{2}} = 0.015*0.04 = 6 \cdot 10^{-4} moles\)              

Hence, the molecular weight (MW) of H₃X is:    

\( MW = \frac{m_{H_{3}X}}{\eta_{H_{3}X}} = \frac{0.2 g}{6 \cdot 10^{-4} moles} = 333.3 g/mol \)

Finally, we can calculate the strength (S) of this solution in ppm as follows:

\( S = \frac{m}{V} = \frac{200 mg}{0.050 L + 0.040 L} = 2222.2 mg/L \)

I hope it helps you!

Answer:Hi! I hope this will help you with your question, whether this is an assignment or not. The answer that I get is 0.033 concentration.

If 0.0025 mol NaNo3 forms during the reaction, the concentration of NaNO3 in the final solution should be 0.033.

Explanation:

The answer is 1) mixing of two gases by diffusion.

Once 2 gases are mixed by diffusion, they cannot be obtained from the mixture of gases. Hence, it is considered to be an irreversible process.

The correlation between the Hammett acid constants of oxides and their activity in the dealkylation of cumene is that the higher the acid strength of an oxide, the higher the catalytic activity of that oxide in the dealkylation of cumene

Hammett acid constants are a measure of the acidity of an acid in terms of the electronic effects of substituents. The acidity of an oxide is strongly linked to its catalytic activity in the dealkylation of cumene. The higher the acid strength of an oxide, the higher the catalytic activity of that oxide in the dealkylation of cumene.

The acidic properties of oxides are influenced by their electronic properties, such as electronegativity and electron-donating properties. As a result, the electronic properties of substituents are important in determining the Hammett acid constants of oxides.

The dealkylation of cumene is an important industrial process that is used to generate phenol and acetone. Because of its commercial importance, a great deal of research has been done on the catalytic activity of various oxides for this reaction.

The acidic properties of the oxides have a major impact on their catalytic activity for this reaction.

Thus, the correlation between the Hammett acid constants of oxides and their activity in the dealkylation of cumene is explained above.

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EDTA (ethylenediaminetetraacetic acid) is commonly used to determine the hardness of water due to its ability to form complexes with metal ions, particularly calcium and magnesium ions.

Water hardness refers to the concentration of calcium and magnesium ions present in water. These ions can cause scaling, reduce the effectiveness of soaps, and have other negative effects. EDTA acts as a chelating agent, meaning it can bind to metal ions and form stable complexes.

In the process of determining water hardness, a known amount of EDTA solution is added to a water sample. The EDTA molecules form complexes with the calcium and magnesium ions present in the water.

The endpoint of the titration is reached when all the metal ions are complexed by the EDTA, resulting in a color change or an indicator reaching a specific endpoint.

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Answer:

3.) 195

Explanation:

Because platinum is 195.079 amu (its on the periodic table)

A purple box has P t at the center and 78 above. Below it says platinum and below that 195.08. Rounded to the nearest whole number, 195 is the atomic mass of platinum. Therefore, option C is correct.

The number of protons an element contains determines its atomic number, which is used to distinguish one element from another. The total number of protons and neutrons in an element determines its mass number.

The mass number is the total number of protons and neutrons in the nucleus. This is due to the fact that each proton and neutron has a mass of one atomic mass unit (amu). You can determine the mass of the atom by multiplying the total number of protons and neutrons by 1 amu.

Because its numerical value is equal to the element's molar mass, the average atomic mass is helpful. In turn, this helps determine how much of a solid.

The atomic mass of platinum is 195. Because atomic mass is always the bottom number below the name of the element.

Thus, option C is correct.

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