11. Shyam helps his mother with the household chores. While helping his mother in the kitchen, Rohan notices that yellow flame is coming out of the gas stove. He immediately asked his mother to clean the gas stove after cooking is done. Why did he ask his mother to clean the gas stove?

Answer:

Explanation:

The standard system of measurement is what is popularly referred to as SI unit (or international system of units). For example, the SI unit for length is basically in meters (m), which is convertible to millimeter (mm), centimeter (cm) or even kilometer (km).

If there is no standard system of measurement,

1) Scientists will not be able to compare data as every scientist will use a unit that suits him/herself which might make data incomparable as some units might be difficult to convert to other units or there conversion methods might even be debatable.

2) There might be a general lack of understanding of the research work done by a scientist/scientists in the scientific community. This is because the standard system of measurement affords scientists to communicate properly with the same or convertible units and based on 1. above, if scientists use any unit that isn't agreed upon, different/unknown/debatable units might make understanding of research works incomprehensible.

4 liters of the 10% solution are needed.

ω₁ = 4% ÷ 100% = 0.04; mass percentage of 8 liters solution

V₁ = 8 L; volume of 4% solution

ω₂ = 10% ÷ 100% = 0.1; mass percentage of solution

ω₃ = 6% ÷ 100% = 0.06; mass percentage of the final 6% solution

V₂ = ?; volume of 10% solution

V₃ = V₁ + V₂; volume of the final 6% solution

ω₁ · V₁ + ω₂ ·V₂ = ω₃ · V₃; formula to calculate volume of the solution

0.04 · 8 L + 0.1 · V₂ = 0.06 · (8 L + V₂)

0.32 L +  0.1 · V₂ = 0.48 L + 0.06 · V₂

0.04 · V₂ = 0.16 L

V₂ = 0.16 L ÷ 0.04

V₂ = 4 L; volume of the 10% solution

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Answer:

As you turn the tube you can see patterns of colors at the other end of the tube. A kaleidoscope works by reflecting light. Light travels in a straight line. When light bumps into something it changes direction.

Kaleidoscopes are made with two or more mirrors. Light reflecting between these mirrors produces multiple virtual images of stunning beauty. ... Light rays are assumed to bounce off the mirrors like a ball bounces off a hard surface. Formally stated, the angle of incidence equals the angle of reflection.

Explanation:

Answer: You should learn the symbols for the eight most abundant elements in the Earth's crust (Oxygen (O), Silicon (Si), Aluminum (Al), Calcium (Ca), Iron (Fe), Magnesium (Mg), Sodium (Na), and Potassium (K) .

Explanation:

From this equation, we can see that the mole ratio of FeO to MgO is 1:1. This means that for every one mole of FeO, there is one mole of MgO involved in the reaction.

What is Mole?

In chemistry, a mole is a unit of measurement that represents an amount of substance. It is defined as the amount of a substance that contains the same number of entities (such as atoms, molecules, or ions) as there are atoms in 12 grams of carbon-12. This number is known as Avogadro's number and is approximately equal to 6.022 x 10²³ entities per mole.

The mole is used as a convenient way to express the amount of a substance in chemical reactions and calculations. For example, the stoichiometry of a chemical reaction is expressed in terms of mole ratios, which show the relative numbers of moles of reactants and products involved in the reaction. The concept of mole also allows us to convert between different units of measurement, such as grams and moles, using the molar mass of a substance.

The mole ratio of iron (II) oxide (FeO) and magnesium oxide (MgO) can be determined from the balanced chemical equation for the reaction between these two compounds. The balanced equation is:

FeO + MgO → Fe + Mg

From this equation, we can see that the mole ratio of FeO to MgO is 1:1. This means that for every one mole of FeO, there is one mole of MgO involved in the reaction.

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Answer: Two different elements H and O are present in water molecule.

Explanation:

As we know, water molecule has formula H₂O in which two of the atoms are hydrogen (H) atoms and the other atom is oxygen (O). So, overall water molecule contains two different elements: hydrogen and oxygen.

A water molecule contains two different elements: hydrogen and oxygen.

A water molecule, represented by the chemical formula H2O, consists of two different elements: hydrogen and oxygen. The hydrogen atoms are bonded to the oxygen atom through covalent bonds. This means that the hydrogen atoms share their electrons with the oxygen atom, forming a stable molecule.

Hydrogen, with the symbol H, is the lightest element on the periodic table. It is a highly reactive gas and is the most abundant element in the universe. Oxygen, with the symbol O, is the third most abundant element on Earth and is essential for supporting life.

When two hydrogen atoms combine with one oxygen atom, they form a water molecule. This molecule is essential for life as we know it, and it plays a crucial role in various biological and chemical processes.

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I wrote, The platinum electrode is the cathode in this reaction. The tin electrode is the anode in this reaction. In the half reactions that occur the nitrate is reduced to nitric oxide(NO) while the tin electrode is oxidized to Sn2+.

Oxidation occurs at the tin half cell(anode) while reduction occurs at the nitrate half cell(cathode).

A galvanic cell refers to a cell that produces electrical energy spontaneously by redox reaction. Oxidation occurs at the anode while reduction occurs at the cathode in a galvanic cell.

The oxidation half equation at the anode occurs as follows;

3Sn(s) → 3Sn^2+(aq) + 6e

The reduction half equation that occurs at the cathode is;

2NO3–(aq) + 8H+(aq) + 6e→  2NO(g) + 4H2O(l)

We can see that electron loss occurs at the cathode while electron gain occurs at the anode as we can see in the equations above.

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One of the isomers of C4H10O that is an alcohol is the 1-butanol or butyl alcohol:

Another of the alcohols that has the given formula is tert-butanol or tert-butyl alcohol:

The third isomer of C4H10O is 2-butanol:

And the last isomer is isobutanol or isobutyl alcohol:

2. The interaction involved in the B⁺-decay is known as beta decay.

3.  The conserved quantities in the reaction are:

The quark flavor is not a conserved quantity in the given reaction of B⁺-decay.

The B⁺-decay is a type of beta decay, specifically beta plus decay. In beta plus decay, a proton (p) decays into a neutron (n), emitting a positron (e+) and an electron neutrino (νe):

p → n + e⁺ + νe

2. The interaction involved in the B⁺-decay is the weak nuclear force. The weak force is responsible for processes involving the transformation of particles, such as the conversion of a proton into a neutron in this case.

The interaction involved in the B⁺-decay is known as beta decay. Specifically, the B⁺-decay refers to the decay of a positively charged (B⁺) meson, which is a type of subatomic particle.

3. The conserved quantities in the reaction are:

Conservation of electric charge: The total charge on both sides of the reaction is conserved. The proton (p) has a charge of +1, while the neutron (n) has no charge. The positron (e⁺) has a charge of +1, which balances out the charge.

Conservation of lepton number: The total lepton number is conserved in the reaction. The lepton number of the proton and neutron is 0, while the lepton number of the positron and electron neutrino is also 0. Hence, the lepton number is conserved.

Conservation of baryon number: The baryon number is conserved in the reaction. The baryon number of the proton is 1, and the baryon number of the neutron is also 1. Therefore, the total baryon number is conserved.

Regarding quark flavor, it is not conserved in the B⁺-decay. The decay process involves the transformation of a up-type quark (u) in the proton to a down-type quark (d) in the neutron. This change in quark flavor is allowed by the weak force.

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Answer:

Hydrogen, hope this helps :)

Enantiomers are: E) non-superposable molecules that are mirror images of each other.

In Science, stereoisomerism is sometimes referred to as spatial isomerism and it can be defined as a form of isomerism in which chemical species of molecules have the same molecular formula, but differ in how their atoms are positioned (arranged) in three-dimensional orientations of space.

This ultimately implies that, stereoisomerism occurs when two molecules are composed of the same atoms that are connected in the same sequence but these atoms are positioned (arranged) differently in space.

Based on scientific records, enantiomers are mirror images of one another and cannot be aligned in space to be identical because they are non-superposable molecules.

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Answer:

Solid ionic compounds do not have electrical conductivity because the ions are not free to move. In a liquid, the ionic compound dissociates into its respective ions.

The atoms inside the reactants reorganise their chemical bonds during a chemical reaction to create products. There will therefore always be a shift in energy when chemical reactions take place.

The atoms inside the reactants rearrange and link differently throughout a chemical reaction to create one or more innovative brands with properties distinct from the reactants. A chemical change occurs when a new material is created.

Exothermic refers to chemical reactions which release energy. When bonds are created in the products of exothermic processes, more energy is produced than is required to rupture the connections between the reactants. Endothermic refers to chemical reactions that either use or absorb energy.

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3D view of H3O+

The stronger line means that the Hydrogen is closer to us in a 3D view, meanwhile the line with traces, or you cal also see as a weaker line, it means that the Hydrogen is farther from us in a 3D view

Lewis Structure of H3O+

Answer:

the answer is....... D. Plasma

Answer:

Plasma

Explanation:

Got it right

The major distinction between emission and absorption spectra is that an emission spectrum has various colored lines, whereas an absorption spectrum contains dark-colored lines. When electrons return to their original energy levels, this is called emission. When electrons absorb energy, they leap to higher energy levels. When ground-state atoms absorb energy from a radiation source, atomic absorption spectra are created. When neutral atoms in an excited state return to the ground state or a lower-energy state, they release energy, resulting in atomic emission spectra.

Answer:

The answer is option A

Colorful feathers

Hope this helps you

Answer:

D. first law of thermodynamics

Answer:

Explanation:

It is to keep the mixture homogeneous

The aim is to produce a homogenous mixture.

Examples of homogenous mixtures are as follows:

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Answer:

Below

Explanation:

2 H2  + O2  ====>      H20      you have 4 H's on L...need 4 on right so:

2H2  + O2 =====>  2 H2 O      Now H's are 'balanced' and a check of the O's  shows they are balanced too (two O's on each side)

Answer:

the activation energy is 65-30

35

The activation energy of this reaction is 35 kJ.

Activation energy, in chemistry, the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo chemical transformation or physical transport.

The activation energy is equal to the difference between the threshold energy needed for the reaction and the average kinetic energy of all the reacting molecules.

The activation energy of a reaction is the difference in energy between the threshold energy and energy of the reactants.

Given,

The highest energy for a reaction to happen = Threshold energy = 65 kJ

Energy of the reactants = 30 kJ

Therefore, The activation energy of this reaction is 35 kJ.

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This is an extremely high concentration, at this concentration, the solution would likely be a solid rather than a liquid due to the formation of NaCl crystals.

To determine the type of NaCl solution, we need to know the amount of NaCl and the amount of water present in the solution. The concentration of NaCl can be expressed in different units, such as mass percent, mole fraction, or molarity.

The number of moles of NaCl can be calculated from the mass of NaCl and its molar mass. The molar mass of NaCl is 58.44 g/mol.

Number of moles of NaCl = mass of NaCl / molar mass of NaCl

Number of moles of NaCl = 20 g / 58.44 g/mol

Number of moles of NaCl = 0.342 mol

Assuming that NaCl is completely miscible with water and that the density of the solution is close to the density of water at 30°C (0.995 g/mL), we can estimate the volume of the solution as follows:

Volume of solution = mass of NaCl / density of solution

Volume of solution = 20 g / (0.995 g/mL)

Volume of solution = 20.10 mL

Molarity = number of moles of NaCl / volume of solution

Molarity = 0.342 mol / 0.0201 L

Molarity = 17.01 M

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Answer:

Oil

Explanation:

A shielded nucleus will have a reduced chemical shift and will absorb upfield from a deshielded nucleus.

The nucleus is the central part of an atom that contains most of its mass and all of its positive charge. It is composed of protons and neutrons, which are held together by a strong nuclear force. The number of protons in the nucleus determines the element that the atom belongs to, while the number of neutrons can vary and give rise to different isotopes of the same element. The properties of the nucleus are essential in determining the behavior of the atom in chemical and physical reactions. Nuclei can also undergo nuclear reactions such as fission and fusion, which release enormous amounts of energy and are the basis for nuclear power and nuclear weapons. The study of nuclei and their properties is known as nuclear physics and is a fundamental area of modern science.

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At standard temperature and pressure (STP), there are 7.695 moles of Cl2 in 90 L of gas.

The number of moles of a gas in a container can be calculated using the Ideal Gas Law, PV = nRT. At standard temperature and pressure (STP), the temperature is 0°C (273.15 K) and the pressure is 1 atm.

The Ideal Gas Law equation is:

PV = nRT

Where:

P is pressure (in atm)

V is volume (in L)

n is the number of moles of gas

R is the universal gas constant (0.0821 L-atm/mol-K)

T is temperature (in Kelvin)

At STP, we can plug in the values:

P = 1 atm

V = 90 L

T = 273.15 K

R = 0.0821 L-atm/mol-K

Solving for n:

n = (P * V) / (R * T)

n = (1 atm * 90 L) / (0.0821 L-atm/mol-K * 273.15 K)

n = (90) / (0.0821 * 273.15)

n = 7.695 moles of Cl2

Therefore, at standard temperature and pressure (STP), there are 7.695 moles of Cl2 in 90 L of gas. Rounded to the nearest hundredth place, there are 7.70 moles of Cl2 in 90 L of gas at STP.

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Answer:

strontium thats the alternative answer

Answer:

I hope this helps I take chemistry too

Explanation:

The formula I used is ΔH vaporization = 2259 J/g,  ΔH vaporization is the symbol for the molar heat of vaporization. This value is a constant for a given substance.Remember that the water is being condensed. The molar heat of vaporization value is used at the solid-liquid phase change, (boiling or condensing).