What is the oxidation number of nitrogen in N20?
00
O+1
O +2
O +4

Based on the given bright-line spectra and the observed wavelengths in the mixture's spectrum, the elements G and J are the ones present in the mixture.

From the given bright-line spectra and the spectrum of the mixture, we can determine the elements present in the mixture by comparing the specific wavelengths observed. Examining the bright-line spectra, we can identify that G has a distinct wavelength at 650 nm, J at 600 nm, L at 550 nm, and M at 500 nm.

Looking at the spectrum of the mixture, we can observe two prominent wavelengths, 650 nm and 600 nm. These correspond to the wavelengths of G and J, respectively. Since the spectrum of the mixture does not exhibit the wavelengths specific to L (550 nm) or M (500 nm), we can conclude that only G and J are present in the mixture.

Therefore, based on the given bright-line spectra and the observed wavelengths in the mixture's spectrum, the elements G and J are the ones present in the mixture.

This analysis relies on the principle that each element has characteristic wavelengths at which they emit light. By comparing the observed wavelengths in the mixture's spectrum with those of the individual elements, we can determine the elements present in the mixture.

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The highest boiling point : A) 0.10 M lithium sulfate, Li₂SO4

Solutions from volatile substances have a higher boiling point and lower freezing points than the solvent  

ΔTb = Tb solution - Tb solvent  

ΔTb = boiling point elevation  

\( \large {\boxed {\boxed {\bold {\Delta Tb \: = \: Kb.m}}} \)  

Kb = molal boiling point increase  

m = molal solution  

For electrolyte solutions there is a van't Hoff factor = i  

i = 1 + (n-1) α  

n = number of ions from the electrolyte  

α = degree of ionization, strong electrolyte α = 1, for non electrolytes i = 1  

So ΔTb   ≈ i(van't Hoff), the greater i, the greater ΔTb

α = 1 ,  strong electrolyte

A) 0.10 M lithium sulfate, Li₂SO4

Li₂SO4 ⇒2Li⁺+SO₄²⁻ ⇒n=3

B) 0.10 M hydrochloric acid, HCI

HCl⇒H⁺+Cl⁻⇒n=2

C) 0.10 M lithium nitrate, LINO₃

LINO₃ ⇒ Li⁺+NO₃⁻ ⇒n=2

D) 0.10 M magnesium sulfate, MgSO4​

MgSO4​ ⇒ Mg²⁺ + SO₄²⁻ ⇒ n=2

Answer:

3

Explanation:

Increasing concentration

Answer:

The molar mass of atoms of an element is given by the standard relative atomic mass of the element multiplied by the molar mass constant

Explanation:

Answer    1 mole = 6.02 × 1023 atoms

0.25 moles × (6.02 × 1023) = 1.5 × 1023 atoms Carbon

for the first one

The percent mass per mass concentration of the solution is  6.80 % (m/m).

We have to note that there are several units of concentration that we are going to have in the chemistry. One of the most common of the units of concentration is the percent concentration. We could look at the percent concentration in three ways;

Percent mass per mass(%m/m)

Percent volume per volume (%v/v)

Percent mass per volume (%m/v)

To convert from percent mass per volume to percent mass per mass, we convert by the density of the solution. In this case, the density of the solution is 1.2 g/mL

We then have;

% m/m = 5.67 % (m/v) * 1.2 g/mL = 6.80 % (m/m)

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Answer:

A.

Explanation:

The number of the them will result in A.

Answer:

Its c

Explanation:

i just did it and got it correct

Scientific investigations include a hypothesis that can be shown to be wrong. The correct option is C.

A scientific investigation is basically a strategy for posing questions and testing potential responses. Observations are usually the starting point for a scientific investigation.

Observations frequently generate questions. Based on scientific knowledge, a hypothesis is a possible logical answer to a scientific question.

The primary goal of a scientific investigation is to increase knowledge. Researchers can discover explanations for natural phenomena and apply their findings to solve real-world problems through observation and experimentation.

The scientific method is an empirical method of acquiring knowledge that has characterized scientific development since at least the 17th century.

It entails careful observation and applying rigorous skepticism to what is observed, given that cognitive assumptions can distort how the observation is interpreted.

Thus, the correct option is C.

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Answer:

A. When two aqueous solutions are mixed, a precipitate is formed.

Explanation:

The precipitate (a solid substance that falls from the liquid) is the result of a chemical reaction taking place between the liquids.

The other three answer choices are indicative of physical changes (temperature change, phase change, color change).

When two aqueous solutions are mixed, a precipitate is formed indicates that a chemical change has occurred.  

Hence, option A is correct answer.

Chemical change are those changes in which substance changes chemical composition. These changes are permanent changes. In chemical change new substances formed and in chemical change substances can not get back into its original form. It is irreversible change.

Physical changes are those changes in which substance changes physical properties only. Properties like temperature, pressure, shape, color, size, state (solid, liquid and gas). These changes are temporary in nature. In physical change no new substances formed. It is reversible change.

Now, check all the options one by one:

Option (A): When two aqueous solutions are mixed, a precipitate is formed is a chemical change. Since precipitation indicate a chemical reaction (that is double displacement reaction).

Option (B): As ammonium nitrate dissolved in water causes the temperature to decrease is a physical change because heat energy is absorbed here and it is a endothermic reaction.

Option (C): Alcohol evaporates when left in an open container is a physical change because evaporation is a physical change as it changes the state from liquid state to gas state.

Option (D): Water is added to blue copper (II) chloride solution. The resulting mixture if lighter blue in color is a physical change as properties like change in color is physical change.  

Thus, from above conclusion we can say that When two aqueous solutions are mixed, a precipitate is formed indicates that a chemical change has occurred.  

Hence, option A is correct answer.

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Explanation:

The greater the number multiplicity of the bond, the shorter the bond becomes.

Therefore the single bond is longer than the double bond. (3)

Answer:

87469.73J

Explanation:

72.25g/0.826kJ/g=87.4697337kJ

The information about the chemical reaction as given by the chemical equation is given below:

Chemical equations are equations that represent chemical reactions that occur in a given system.

Chemical equations use symbols to represent the reactants and the products of a reaction.

The symbols used in chemical equations are the symbols of the elements or compounds involved in the chemical reaction.

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Answer:

1.674 x 10^-23 grams

Explanation:

Hydrogen-1 is called Protium

wikipedia

atomic mass of Protium is 1.00794 amu

sciencedirectcom

atomic mass of 10 Protiums is 10.0794 amu

10.0794 amu in grams is

1.6737236x10^-23 grams

The correct answer for this question is that a statement that can be proven by observation or measurement is known as a fact. The other possible answers here simply refer to idea that different individuals can place value on, but that are not necessarily known to be true.

Answer:

46 359 J

Explanation:

You need heat of fusion of water:   334 J/g

 and specific heat of ice : 2.093 j/g-C

120 * 334    = 40 080 J to make ice

+   120 * 2.093 * 25  = 6279 J   to chill the ice to -25 C

Total = = 46359 J

The equilibrium constant for the system at this temperature is\(1.17 × 10^-31 mol^2/L^2\).

For the chemical equation:

N2(g) + O2(g) ⇌ 2NO(g)

The equilibrium mixture at a temperature of 1500 K is determined to contain 6.4 × 10^-3 mol/L of N2,\(1.7 × 10^-3\)mol/L of O2 and 1.1 × 10^-5 mol/L of NO.  First, we need to calculate the concentration of N2 and O2 required to produce

1.1 × 10^-5 mol/L of NO:

2NO(g) = N2(g) + O2(g)

Given that there are 1.1 × 10^-5 mol/L of NO, the number of moles of N2 and O2 are equal since the stoichiometric ratio is 1:1. Therefore:

\(1.1 × 10^-5 mol/L\) = [N2][O2]Kc = \(([NO]^2)/([N2][O2])Kc\)= \((1.1 × 10^-5 mol/L)^2/(6.4 × 10^-3 mol/L)(1.7 × 10^-3 mol/L)Kc\) =

1.17 × 10^-31 mol^2/L^2.

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Step 1 - Understanding percentual concentration

To express the concentration of a substance as a percentual concentration, we just need to divide its mass by the total mass:

Step 2 - Calculating the concentration in the pill

We want to calculate the concentration of Mg in the pill. Therefore, we'll divide its mass by the total mass of the pill:

Answer: the concentration of Mg in the pill is 6.8%

40 grams of KCl are dissolved in 100 mL of water at 45C. 5g of  additional grams of KCI are needed to make the solution saturated at 80 C as the solubility of KCl is 45g/ml

A uniform combination of a number of solutes within a solvent is referred to as a solution. One frequent illustration of a Solution is adding sugar cubes into your cup of tea and coffee. Solubility is the quality that makes sugar molecules more soluble.

In water, potassium chloride (KCl) dissolves. Its water solubility, like that of all other solutes, depends on temperature. The solubility of a salt increases as the solvent's temperature rises. This is fairly simple to experience with sugar. 40 grams of KCl are dissolved in 100 mL of water at 45C. 5g of  additional grams of KCI are needed to make the solution saturated at 80 C as the solubility of KCl is 45g/ml.

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The activation energy of the reaction is positive when a reaction release energy.

Chemical reactions that release energy are called exothermic.

Exothermic reaction is the reaction that release energy during the formation of bonds in the products.

Energy is released when bonds are formed in products compare to the reactants.

Therefore, activation energy of the reaction is positive because it is the energy that is needed to break barriers for reaction to start and it release chemical energy during reaction.

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The decomposition of aspirin (acetylsalicylic acid,\(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)).

The decomposition of aspirin (acetylsalicylic acid, \(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)). To determine the moles of each product formed, we need to consider the balanced chemical equation for the reaction:

\(C_{9} H_{8} O_{4} = > C_{7} H_{6}O_{3} +CH_{3} COOH\)

From the equation, we can see that for every 1 mole of aspirin, 1 mole of salicylic acid and 1 mole of acetic acid are produced.

Therefore, the moles of salicylic acid and acetic acid formed will be equal to the number of moles of aspirin that decomposes. If we know the amount of aspirin in moles, we can directly calculate the moles of each product based on stoichiometry.

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Answer:

ammonia diffuses faster.

hope this helps.

a. The chemical equation for the electrolysis of water is:

2H2O(l) → 2H2(g) + O2(g)

b. The gas obtained at the anode during the electrolysis of water is oxygen (O2).

c. The volume of gas obtained at the anode is 0.002232 moles or approximately 0.05 L of oxygen gas.

a. The chemical equation for the electrolysis of water is:

2H2O(l) → 2H2(g) + O2(g)

b. The gas obtained at the anode during the electrolysis of water is oxygen (O2).

c. According to the balanced chemical equation, for every 2 moles of water (H2O) electrolyzed, 1 mole of oxygen gas (O2) is obtained. Since 1 mole of any gas occupies 22.4 L at standard temperature and pressure (STP), we can use the stoichiometry of the reaction to determine the volume of oxygen gas produced.

Given that 50 cm³ of gas is obtained at the anode, we need to convert this volume to liters:

50 cm³ = 50/1000 L = 0.05 L

Using the stoichiometric ratio of the balanced equation, we find that 2 moles of water produce 1 mole of oxygen gas. Therefore, 0.05 L of oxygen gas is equivalent to:

0.05 L × (1 mole/22.4 L) = 0.002232 moles

Thus, the volume of gas obtained at the anode is 0.002232 moles or approximately 0.05 L of oxygen gas.

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Answer:

The atomic size decreases with an increase in atomic number when we move from left to right.

Explanation: Hope it helps you:))))))

                      Have a great day.

The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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We can see that the reactants would be:

2 tomato slices, 4 cucumber slices, 2 bread slices.

And the ingredients available are:

8 tomato slices, 22 cucumber slices, 8 bread slices.

You can note that for tomato and bread slices, multiplying the reactants by 4, we have 8 tomato slices and 8 bread slices, these are the exact amount that we have in ingredients. But, if we multiply 4 cucumber slices by 4. we're going to have that we need 16 cucumber slices, but in the available ingredients we have an excess because there are 22 cucumber slices and we just need 16 slices.

This would be our leftover reactant. As we're going to use 16 slices of cucumber and we have 22 slices, we have 6 slices of cucumber left over, so the answer would be six cucumber slices.

Answer:

this shape is called bent or angular. a molecule with four electron groups around the central atom orients the four groups in the direction of a tetrahedron.if there are four atoms attached to these electron groups then the molecular shape is also tetrahedral.

Explanation:

Hope this helped Mark BRAINLEST!!!!!

Bent geometry related to the tetrahedral geometry because of;

The two lone pairs and the two bonds

Example is water (H₂O). In this example Oxygen will form a V-shape with the 2 hydrogen molecules which are the lone pairs as well as two bonds for each of the hydrogen molecule.

        In conclusion, the relationship between bent geometry and tetrahedral geometry is that they both have 2 bonds and 2 lone pairs.

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Answer:

\(Molarity\,\,of\,\,the\,\,solution\,\,is\,\,S=0.039M\)

Explanation:

\(W=2.18 g\\M=322g\\V=175mL=0.175L\\\\S=\frac{W}{MV} \\=>S=\frac{2.18}{322*0.175} \\So,S=0.039M\)

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