2 CuCl2 + 2 NaNO3 ---> Cu(NO3)2 + 2 NaCl



If 15 grams of copper (II) chloride react with 20 grams of sodium nitrate, Which is the limiting reagent

Answer:

They are normally unreactive with other elements.

Explanation:

Study island :)

Answer:

Explanation:

In fire and arson cases evidences like volatile fuel in the sediment debris can be collected. The debris should be collected in an air-tight container like tin or paint box and bottles so as to prevent the evaporation of the fuel. The type of fuel used for setting up the fire is an important evidence.

Plastic bags should not be used because the plastic can react with the fuel components and may react with the fuel components in debris and the evidence will become futile.

Explanation:

Photoelectric effect: Electrons are ejected out from the surface of metal when light of sufficient frequency falls upon shiny surface of metals. light is made up small bundles of energy packets named photons which when falls on surface transfer their energy to electrons due which electrons ejects out of the metallic surface. The energy for one photon was given by expression:

E=h[tex]\nu[/tex], or [tex]E\propto \nu[/tex]

h=Planck's constant, [tex]\nu[/tex]= frequency of the light

Kumar can increase the energy of emitted electron by using light with higher value of frequency than the frequency of red light. This is because the energy  carried by the photon of a light is directly proportional to the frequency of the light. Higher the value of frequency of light higher will be the value of energy of a photon. And photon with higher energy will impart more amount of energy to an electron while ejection.

To find the mass of 5 moles of Fe₂O₃, multiply its molar mass (159.70 g/mol) by 5, resulting in 798.5 grams. This calculation uses the molar mass of the elements iron and oxygen.

To find the mass of 5 moles of Fe₂O₃, we need to use the molar mass of the compound. Fe₂O₃ has the following molar mass:

Fe: 55.85 g/mol

O: 16.00 g/mol

Since there are 2 iron atoms and 3 oxygen atoms in Fe₂O₃, the calculation is:

2 × 55.85 g/mol + 3 × 16.00 g/mol = 159.70 g/mol

Now, multiply the molar mass by the number of moles:

159.70 g/mol × 5 mol = 798.5 g

Therefore, the mass of 5 moles of Fe₂O₃ is 798.5 grams.

Final answer:

To find the moles of carbon in the original unknown compound, we use the mass of the carbon dioxide produced from combustion, and divide by its molar mass. This gives us the moles of carbon dioxide, which are equivalent to the moles of carbon in the sample, resulting in 0.0834 mol of carbon.

Explanation:

To determine how many moles of carbon, C, were in the original 2.50g sample of an unknown compound after combustion, we need to use the mass of carbon dioxide (CO2) produced. Every mole of CO2 contains one mole of C, so the moles of C are equal to the moles of CO2.

First, calculate the moles of CO2 using its molar mass:
Moles of CO2 = mass of CO2 / molar mass of CO2
Molar mass of CO2 is approximately 44.01 g/mol
Moles of CO2 = 3.67 g / 44.01 g/mol = 0.0834 mol

Since each mole of CO2 represents one mole of carbon, the moles of carbon in the original compound is also 0.0834 mol.

Answer: Option (a) is the correct answer.

Explanation:

Since, it is given that energy is absorbed by the water molecules resulting in a decrease in water's temperature, that is, there will also be a decrease in the energy of molecules.

As a result, molecules will come closer to each other. This means that the diagram (a)  best illustrates the energy change of this dissolving process.

Answer:

A.

Explanation:

The energy is absorbed by the water, it means that the system is losing heat, so, the difference of energy must be negative, the initial energy must be higher than the final energy.

For the reaction happens, the reactants must gain energy to overtake the activation energy, and for that, the reaction can occur.

Only letter A represents a system that the final energy is higher than the initial, and the system gains energy at the beginning.

Answer: Renewable fuels derived from biological matter are called biofuels.

Explanation:

Bio fuels are the fuels which are derived from plants, algae or from the waste of animals. Unlike fossil fuels they are produced from renewable resources  which can be replenished again and again.

For example; ethanol from corns and sugarcane, green diesel from algae etc.

Answer:

            Box 1  = Sodium Chloride

           Box 3  =  Covalent Bond

Explanation:

Naming NaCl:

                     Ionic compounds are named as;

          i) The positive specie is named first.

          ii) The negative specie is named after.

Example: In NaCl, Sodium is the positive cation i.e. Na⁺ hence, it is named first followed by the name of negative anion which is Cl⁻ (chloride). Therefore, the name given to NaCl is Sodium Chloride.

Covalent Bond:

                This type of bond is formed between atoms by mutually sharing their valence electrons. The type of bond depends upon the electronegativity difference between the atoms. If the electronegativeity difference is greater than the bond will be polar covalent bond or if the difference is small than the bond will be non polar colvalent bond.

A- There was no apparent source for the uranium salts' energy (just took the edg test)

Answer:

The correct answer is "There was no apparent source for the uranium salts’ energy."

Explanation:

Becquerel while working on X-rays accidentally discovered radioactivity. While working with uranium salts he observed that it emitted penetrating radiation that exposed photographic film. His contemporaries did not know radioactivity and hence they believed that there was no apparent source for the uranium salts’ energy.

Final answer:

Milk of magnesia is a base with a pH greater than 7, specifically around 10.5, making it effective as an antacid. It contrasts with neutral substances, like water, and acidic substances, like wine.

Explanation:

Milk of magnesia is a base. This determination is based on its pH level, which is greater than 7. Specifically, milk of magnesia, which is largely comprised of magnesium hydroxide (Mg(OH)2), has a pH of approximately 10.5. This high pH level classifies it as a basic substance, meaning it has properties that counteract acids. This characteristic is why milk of magnesia is commonly used as an antacid to neutralize stomach acid and alleviate symptoms of indigestion and heartburn.

In comparison, substances with a pH of 7, such as pure water, are considered neutral, neither acidic nor basic. Substances like wine, with a pH less than 7, are classified as acidic. Understanding the pH scale and the properties of acids and bases is essential in chemistry and various practical applications, including medicine and nutrition.

The ability of an atom to GAIN

Final answer:

Helium is used in balloons because it is lighter than air and safely floats due to its low density and nonreactive, nonflammable properties. So the correct option is b.

Explanation:

Helium is used in balloons because it is lighter than air. This is due to helium's much lower density and atomic mass compared to the average molar mass of air. Helium's atomic mass is approximately 4.00 g/mol, while air has an average molar mass of about 29 g/mol. Hence, when a balloon is filled with helium, it floats. Another critical property of helium that makes it the gas of choice for balloons is its nonreactivity. Helium is chemically non-reactive and nonflammable, which contrasts with hydrogen, another light gas that is, however, highly flammable. This property of helium makes it safe for use in various applications like balloons, airships, and blimps. Furthermore, in environments where there is a high risk of fire or explosion, such as in welding, helium serves as an inert protective atmosphere. Finally, for deep-sea divers who operate under high pressure, a mixture of oxygen and helium is essential to avoid nitrogen narcosis, commonly known as the “rapture of the deep”.

The two species diverged from a common ancestor approximately 40 million years ago, calculated by multiplying the total number of mutations (eight) by the mutation rate (one mutation per 5 million years).

To estimate the time two species shared a common ancestor using a molecular clock, one must know the mutation rate and the number of mutations that have accumulated in both species since they diverged from a common ancestor. In the given problem, the molecule has a neutral mutation rate of one mutation per 5 million years. If the molecules in the two species differ by a total of eight mutations, the time since the common ancestor can be estimated by multiplying the number of mutations by the rate of mutation. Therefore, 8 mutations  imes 5 million years per mutation equals 40 million years ago.

Answer: Option (a) is the correct answer.

Explanation:

Conductivity of a solution depends number of ions present in the solution. As these ions move from one place to another and thus there will be easily flow of current.

So, when there is increase in concentration then it means there are moer number of ions present into the solution.

Thus, conductivity will also increase due to increase in concentration of salt solution.

Answer:

Fluorine (F) would be least likely to form a cation

Explanation:

A cation is a positively charged atom (or molecule) which has lost electron (or electrons). Electropositive elements show a greater propensity to lose electrons and form cations. These are usually metals that are present on the left of the periodic table.

Electropositivity or the tendency to lose electrons and form cations increases on going down a group and decreases across a period. In the given examples:

Potassium, K is an alkali metal and will lose electrons readily to form a cation

Nitrogen (N), Fluorine (F) and chlorine (Cl) are all non metals which prefer to accept electrons and form anions instead. Among the three, F is the most electronegative i.e. it will prefer to accept electrons and form F- rather than F+.

Answer:

Above is correct, but the heat of reaction is 176.18 J/mol

Explanation:

Answer : The resulting solution will have a pH of 7.

Explanation:

Whenever acid and base reacts with each other to form water molecule is called Neutralization reaction. This water molecules is formed from the  hydronium ion ([tex]H^+[/tex]) from acid and hydroxide ion([tex]OH^-[/tex]) from base.

When the equal volumes of acid and base of equal strength are combined, the resulting pH of the solution becomes 7.

The pH 7 value means that the solution is neutral.

Francium has the largest atomic radius due to having the highest number of energy levels and the least nuclear pull.

The correct answer is B. Francium has the largest atomic radius because it has the highest number of energy levels and the least nuclear pull. The atomic radius refers to the size of an atom, which is determined by the distance between the nucleus and the outermost electron shell.

Francium has the highest number of energy levels, which means the electrons are located farther from the nucleus, resulting in a larger atomic radius. Additionally, francium has the least nuclear pull, meaning the positive charge of the nucleus has less of an attraction on the outermost electrons, allowing them to spread out more.

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The kinetic theory of matter states that all particles of matter are in constant motion.

The following are the postulates of kinetic theory of gases:

1. The particles of gases are in constant and random motion. Due to this motion, they collide with each other and walls of the container.

2. The particles of gases have point mass and zero volume.

3. The particles of gases have no such attraction or repulsion between them.

4. The kinetic energy with which the particles are moving is directly proportional to temperature. A temperature increases, kinetic energy also increases, and particles collide each other more frequently.

5. The particle of gases at given temperature have same kinetic energy.

Answer

Explanation

Answer:

[tex]\huge \boxed{\mathrm{2}}[/tex]

[tex]\rule[225]{225}{2}[/tex]

Explanation:

[tex]\sf CH_4+ O_2 \Rightarrow CO_2 + H_2O[/tex]

Balancing the Hydrogen atoms on the right side,

[tex]\sf CH_4+ O_2 \Rightarrow CO_2 +2 H_2O[/tex]

Balancing the Oxygen atoms on the left side,

[tex]\sf CH_4+ 2O_2 \Rightarrow CO_2 +2 H_2O[/tex]

[tex]\rule[225]{225}{2}[/tex]

The following pairs of elements would most likely exhibit similar properties:

The chemical properties and behavior of elements are determined by the their valence electrons. Elements with the same number of valence electrons will exhibit similar chemical properties.

The number of valence electrons can be determined easily from the periodic table. In the periodic table the elements are arranged in columns and rows. Columns are called the groups and the rows are the periods. From left to right, each group is numbered from 1 to 18. The group number gives information about number of valence electrons of the element:

Elements that belong to the same group have similar chemical properties.

Potassium and Lithium are both Group 1 element and have one valence electron. They are both very reactive with water. They form an alkaline solution with water.

Neon and Krypton are both Group 18 or Noble Gases. Both elements have filled valence shells with eight electrons and are very stable and quite unreactive.

Keywords: chemical properties, groups,