A chemist who studies water samples did a demonstration of how to test for lead in water. She added a clear solution of potassium iodide to a clear solution of lead nitrate. Then a yellow swirling solid formed in the liquid.

What is most likely true about the yellow solid?

A.
It is solid lead nitrate.
B.
It was secretly added to the test tube by the scientist.
C.
It is a new substance with different properties.
D.
It is solid potassium iodide.

Both reactions are the examples of reversible reaction and the reaction moves both forward and backward direction.

In the first equation, hydrogen monoxide molecule is broken down into  water and oxygen molecule. These two molecules again converted into hydrogen monoxide due to reversible reaction and gets equilibrium.

While on the other hand, in the second equation, oxygen molecule turns into ozone molecule and this ozone molecule again converted into oxygen molecule due to reversible reaction and attains equilibrium.

So we can conclude that both reactions are the examples of reversible reaction and the reaction moves both forward and backward direction.

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Answer:

the cheta

Explanation:

kinetic means movement

Answer:

9x +6b

hope this helps

have a good day :)

Explanation:

Answer:

T=-166.8 C

Explanation:

PM=m/vRT

T=PMV/mR

T=5.8*14*1.3/12.1*0.08206

T=106.3K

=106-273.15=-166.8 C

Based on the periodic table, the element that is most reactive is Na.

The correct option is A.

Reactivity is a gauge of an element's propensity to create compounds with other elements. While certain elements require energy to react and are inert, others will do so simply and spontaneously. Reactivity is a gauge of an element's propensity to create compounds with other elements.

Reactive elements are the Group 1 and Group 2 metals. Also, the Group 17 and Group 16 non-metals are reactive non-metals.

Group 1 and Group 2 metals form positive ions easily by electron loss. Group 17 and Group 16 non-metals form negative ions by electron gain.

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One possible molecule that could serve as an initiator for free radical polymerizations is di-tert-butyl peroxide (DTBP).

DTBP has a bond energy of 50 kcal/mol for its O-O bond, which is weaker than the O-O bonds in AIBN (68 kcal/mol) and benzoyl peroxide (58 kcal/mol). This means that DTBP is more likely to undergo homolytic cleavage and generate free radicals that can initiate polymerization reactions.

For the polymerization of styrene, the sign of AS is likely to be negative.

Polymerization reactions involve the formation of many covalent bonds between monomer units, which leads to a decrease in entropy (disorder) of the system. This is because the molecules become more ordered and constrained as they are incorporated into the polymer chain. Therefore, the entropy term in the Gibbs free energy equation (ΔG = ΔH - TΔS) will be negative, which means that AS is also negative.

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Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

\(d = \sqrt{ ({x1 - x2})^{2} + ({y1 - y2})^{2} } \\ \)

where

(x1 , y1) and (x2 , y2) are the points

From the question

mass of metal = 67.5 g

volume = 15 mL

The density of the metal is

\(density = \frac{67.5}{15} = \frac{9}{2} \\ \)

We have the final answer as

Hope this helps you

Answer:

b. bread turns brown in the toaster

Answer:

B

Explanation:

Bread turns brown in a toaster really fast. But with the other stuff it takes forever.

The provide an accurate answer, I would need to know the specific carboxylic acid and the available starting materials and reagents from the tables you mentioned, as they were not provided in the question. However, I can give you a general guideline on how to approach such a synthesis problem.

The Identify the target carboxylic acid you want to synthesize and analyze its structure. Review the available starting materials and reagents listed in the tables and determine which ones might be useful in creating the target carboxylic acid. Identify the functional groups in the target carboxylic acid and consider possible reactions to form those functional groups from the available starting materials. Develop a step-by-step synthesis plan, incorporating the starting material number and reagent letters as described in your question. Check that the plan leads to the formation of the target carboxylic acid and uses the most efficient synthesis route possible with the provided materials and reagents. Once you provide the specific carboxylic acid and tables, I will be happy to help you devise the most efficient synthesis plan.

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The balanced chemical equation for reaction equation for the bromination of stilbene using pyridinium the limiting reagent in the following procedure is given as:

2 C₁₄H₁₂ + 3 Br₂ + 2 C₅H₅NHBr → 2 C₁₄H₁₁Br₂ + 2 C₅H₅N + 2 HBr

The bromination of stilbene using pyridinium bromide as the limiting reagent can be represented by the following balanced reaction equation:

2 C₁₄H₁₂ + 3 Br₂ + 2 C₅H₅NHBr → 2 C₁₄H₁₁Br₂ + 2 C₅H₅N + 2 HBr

In this reaction, stilbene (C₁₄H₁₂) reacts with bromine (Br₂) in the presence of pyridinium bromide (C₅H₅NHBr) as a catalyst. The products formed are 1,2-dibromo-1,2-diphenylethane (C₁₄H₁₁Br₂), pyridine (C₅H₅N), and hydrogen bromide (HBr).

The given question is incomplete and the complete question is given as,

Write a balanced reaction equation for the bromination of stilbene using pyridinium when the limiting reagent in the following procedure is given.

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Answer:

Cl² is dichlorine

Explanation:

.mark me as brainliest ❤️

The balanced chemical reaction will be: \(Mg(OH)_2 + 2 HCl --- > MgCl_2 + 2 H_2O\)

A balanced chemical reaction is a reaction that obeys the law of conservation of matter.

According to this law, matter can neither be created nor destroyed. However, they can be converted from one form to another during reactions.

Following this law, a balanced chemical reaction must, therefore, have the same number of species atoms before and after the reaction.

Hence, the balanced equation is \(Mg(OH)_2 + 2 HCl --- > MgCl_2 + 2 H_2O\)

The number of Mg, O, H, and Cl atoms before and after the reaction is the same.

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Answer:

Inference

Explanation:

I mean, it's not difficult.

A theory is an unproven explanation.

An inference is a guess/educated guess where you don't have all the facts.

For example, if "Bob" is caught in the kitchen with a ketchup stain on his shirt, you are inferencing that he used the ketchup.

However, if you see a ketchup bottle nearby or saw it earlier, then it is not, because you already have the facts that ketchup was used.

Answer:

C₃H₅N₃O₉

Explanation:

Molar mass of nitroglycerin (Ratio of mass and moles of the compound) is:

1.00g / 0.0041mol = 226.8g/mol

We can write the equations:

0.6H = C (1)

-60% as many carbon atoms as hydrogen atoms-

3N = O (2)

C = N

Using as basis the atoms of Carbon:

Carbon = 1

Nitrogen = 1

Oxygen = 3

Hydrogen = 1/0.6 = 1.67

A molecular formula has just whole numbers. This ratio of atoms times 3:

Carbon = 3

Nitrogen = 3

Oxygen = 9

Hydrogen = 5

C₃H₅N₃O₉. Molar mass of this formula is:

C = 12.01g/mol*3 = 36.03g/mol

H = 1.01g/mol*5 = 5.05g/mol

N = 14g/mol*3 = 42g/mol

O = 16g/mol*9 = 144g/mol

Molar mass:

36.03g/mol + 5.05g/mol + 42g/mol + 144g/mol = 227g/mol ≈ 226.8g/mol

That means molecular formula of nitroglycerin is:

The molecular formula of nitroglycerin is C₃H₅O₉N₃

Mass of nitroglycerin = 1.00 g

A number of moles of nitroglycerin =  0.0041 mol

It is required to calculate the molecular formula of nitroglycerin.

An empirical formula tells us the relative ratios of different atoms in a compound.

The molecular formula of nitroglycerin can be estimated with the help of empirical formula.

The molar mass of nitroglycerin (Ratio of mass and moles of the compound) is:

1.00g / 0.0041mol = 226.8 g/mol

We can write the equations:

0.6H = C (1)

-60% as many carbon atoms as hydrogen atoms-

3N = O (2)

C = N

Using as basis the atoms of Carbon:

Carbon = 1

Nitrogen = 1

Oxygen = 3

Hydrogen = 1/0.6 = 1.67

A molecular formula has just whole numbers. This ratio of atoms times 3:

Carbon = 3

Nitrogen = 3

Oxygen = 9

Hydrogen = 5

C₃H₅N₃O₉.

Molar mass of this formula is:

C = 12.01g/mol*3 = 36.03g/mol

H = 1.01g/mol*5 = 5.05g/mol

N = 14g/mol*3 = 42g/mol

O = 16g/mol*9 = 144g/mol

Molar mass:

36.03g/mol + 5.05g/mol + 42g/mol + 144g/mol = 227g/mol ≈ 226.8g/mol

That means molecular formula of nitroglycerin is:

C₃H₅N₃O₉

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Option iv) Potassium cyanide (KCN) is the salt that will form a neutral solution when dissolved in water. This is because it contains a cation (potassium ion, K+) and an anion (cyanide ion, CN-) that combine to form a compound with no net charge.

When KCN dissolves in water, the potassium ion and the cyanide ion dissociate and become surrounded by water molecules, resulting in a neutral solution. The potassium ion carries a positive charge, while the cyanide ion carries a negative charge. These charges balance each other out, resulting in a solution with no overall charge, hence making it neutral.

On the other hand, the other salts listed, such as acetic acid (CH3COOH), hydrobromic acid (HBr), and sodium phosphate (Na3PO4), will not form neutral solutions when dissolved in water. Acetic acid is a weak acid and will dissociate into hydrogen ions (H+) and acetate ions (CH3COO-), resulting in an acidic solution. Hydrobromic acid is a strong acid and will also dissociate into hydrogen ions (H+) and bromide ions (Br-), resulting in an acidic solution. Sodium phosphate is a salt that dissociates into sodium ions (Na+) and phosphate ions (PO43-), resulting in a solution with a basic pH due to the presence of the phosphate ions.

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Answer:

19.65%

Explanation:

7.86/40×100%

=19.65%

The percent of O in a 40.0 g sample of an unknown compound is found to containing 32.14 g Zn and 7.86 g O is 19.65%

The solution composition can be described in mass percentage which shows the mass of solute present in a given mass of solution.

The quantity of solute is expressed in mass or by moles.

For a solution, the mass per cent is described as the grams of solute per grams of solution, multiplied by 100 to get the percentage.

Formula ;

Mass percent =  (mass of chemical÷total mass of compound) x 100.

                        = 7.86/40 × 100 %

                        = 19.65 %

Therefore, The percent of O in a 40.0 g sample of an unknown compound is found to containing 32.14 g Zn and 7.86 g O is 19.65%

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Answer:

Telophase

Explanation:

I looked up the ending lol!hope  this helps

A(n) ale tends to be fuller bodied and more bitter than the average beer. Therefore, the correct answer is option a: ale.

Ales are a type of beer that are known for their robust and complex flavors. They are typically fermented at warmer temperatures using top-fermenting yeast strains. The warmer fermentation process allows for a more rapid fermentation, resulting in a beer with fuller body and more pronounced flavors.

Ales often exhibit a range of flavors including fruity, spicy, and hoppy characteristics. They are known for their distinct bitterness, which comes from the higher hop content used during brewing. Hops are responsible for imparting bitterness and aroma to the beer, and ales tend to have a higher hop presence compared to other beer styles.

In contrast, lagers (option b) are generally lighter and crisper in flavor, as they are fermented at cooler temperatures using bottom-fermenting yeast. Lambics (option c) are a type of sour beer with unique flavors derived from spontaneous fermentation and the use of wild yeast and bacteria. Pilsners (option d) are a specific type of lager known for their pale color and clean, crisp taste.

Therefore, among the given options, ales are the ones that tend to be fuller bodied and more bitter than the average beer.

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The entropy of the system increases and heat is absorbed in this chemical reaction.

When ammonium chloride NH4Cl reacts with water, it absorb energy for the surrounding and decomposes into its component ions such as NH4+ and Cl- so we can conclude that increases occur in the entropy of the system and heat is absorbed.

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Answer:

Add Iodine-KI reagent to a solution or directly on a potato or other materials such as bread, crackers, or flour. A blue-black color results if starch is present. If starch amylose is not present, then the color will stay orange or yellow

The correct answer is A. chromate.

Chromate ions (CrO4^2-) typically form insoluble compounds with many cations, resulting in precipitates.

Examples include lead chromate (PbCrO4), silver chromate (Ag2CrO4), and barium chromate (BaCrO4). These precipitates are often brightly colored, with lead chromate known for its yellow color.

Bicarbonate (B), chlorate (C), and acetate (D) ions, on the other hand, generally form soluble compounds with most cations and do not typically result in insoluble compounds.

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Answer:

λ= 4.99 * 10^-17

Explanation:

C= F * λ

F= frequency(Hz)

λ= wavelength(m)

C= 3.0 * 10^8

F= 6.01 * 10^24

λ= ?

3.0 * 10^8= (6.01 * 10^24) λ

***Simplify

λ= 4.99 * 10^-17

Answer:

Li + Cl₂

Explanation:

left side of the arrow are reactants and right side of the arrow are products.

Answer: D. If the reaction occurs in the gas phase

Explanation:

Answer:

D is correct via A P e x

Explanation:

• Molar mass NH3 ,= Molmass of N + ( 3xmol.mass of H ) = ,17 g/mol

• Molar mass of O2, = 2 x Mol.mass of O = 2*16 = ,32 g/mol

• Mass of NH3 = 7.42 g

The balanced equation of the chemical reaction:

According to stoichemistry ,

• 4 moles of NH3 reacts with 5 moles of O2

• 4x17 g of NH3 reacts with 5x32 g of O2

• then , 7.42 g NH3 reacts with x mass of O2

Answer:The 2nd and 3rd one.

Explanation:

It has the same number of protons but different amount of nuetrons.

The age of a skeleton can be determined by measuring the amount of carbon-14 present in the remains. Carbon-14 is a radioactive isotope of carbon that undergoes decay over time. In this case, the skeleton has lost 19% of its carbon-14.
The decay rate, k, of carbon-14 is given as 0.01205% per year.

This means that each year, the amount of carbon-14 in the skeleton decreases by 0.01205% of the remaining amount.
To find the age of the skeleton, we can use the formula for exponential decay: N(t) = N0 * e^(-kt). Since we know that the skeleton has lost 19% of its carbon-14, the remaining amount is 100% - 19% = 81% of the initial amount. Therefore, N(t) = 0.81 * N0. Substituting these values into the formula, we have: 0.81 * N0 = N0 * e^(-0.01205t). Dividing both sides by N0, we get: 0.81 = e^(-0.01205t)

To solve for t, we take the natural logarithm (ln) of both sides: ln(0.81) = -0.01205t. Now we can solve for t: t = ln(0.81) / -0.01205. Using a calculator, we find that t is approximately 137.51 years. Therefore, the skeleton is estimated to be around 137.51 years old based on the 19% loss of carbon-14 and the given decay rate.

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b) the nucleus comtains protons and neutrons and surrounded by electrons