Science help this is my last question

Answer:

This is an example of chemical change because the Kool aid dissolved and turned the water red

The number of carbon atoms present in 1.25 mol of silver acetate is 1.875 × 10²³.

Avogadro's number is define as the number of atoms of any substance present in one mole of that substance, and it is equal to 6.022 × 10²³, i.e.
1 mole = 6.022 × 10²³ atoms/mol

Given moles of silver acetate = 1.25 moles

Number of atoms of silver acetate in 1.25 moles = 1.25 × 6.022 × 10²³ = 7.5×10²³

Molecular formula of silver acetate is CH₃CO₂Ag, means in this molecule total 8 atoms are present so number of carbon atom will be calculated as:

Carbon atoms = (2× 7.5 × 10²³) / 8 = 1.875 × 10²³ atoms [here we multiply by 2 because 2 atoms of carbon is present in olecule]

Hence required atoms of carbon is 1.875 × 10²³.

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Answer:

145%

Explanation:

175/12 = 14.5

14.5 * 10 = 145%

A person has a systolic pressure of 174 mm Hg. Then the normal percentage is 145 mm Hg.

Systolic blood pressure, which is the first number, gauges the pressure in your arteries when your heart beats. Diastolic blood pressure, or the second number, gauges the pressure in your arteries between heartbeats.

Two numbers are used to represent blood pressure values. The highest figure represents the maximal pressure that the beating heart can produce (systolic pressure). The pressure in the arteries between beats is shown by the bottom number (diastolic pressure).

The causes of high systolic blood pressure are numerous. Our arteries tighten as we age, which over time helps to cause high blood pressure. High blood pressure can also be brought on by the genes we inherit. High blood pressure can also result from underlying disorders including thyroid illness, excessive cortisol, and obesity.

Thus,  the normal percentage is 145 mm Hg.

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Answer:

The student shouldn't have added water to the acid.

Explanation:

The aim of titration is to standardize an unknown solution. Recall that a standard solution is one whose concentration is known.

After the acid has been prepared, it has a particular concentration. The student should't have diluted it further. The further dilution of a small volume of acid drastically reduces the concentration of the acid to such low value that the H^+ ions present are insufficient to react with the OH^- from base in order to turn the solution to pink.

Answer:

The concentration of this NaCl solution is 0.0769M

Explanation:

Hello there!

In this case, since we are dealing with a solubility equilibrium in which it is desired to compute the concentration of a common-ion effect to chloride solution in the form of NaCl, we can set up the equilibrium reaction and expression:

[tex]AgCl(s)\rightleftharpoons Ag^+(aq)+Cl^-(aq)\\\\Ksp=[Ag^+][Cl^-]\\[/tex]

It is possible to insert the concentration of starting chloride ions provided by the ionization of NaCl and in terms of the molar solubility, s, equal to 2.38x10^{-9}M:

[tex]Ksp=(s)(C+s)\\\\1.83x10^{-10}=(2.38x10^{-9})(M+2.38x10^{-9})[/tex]

Thus, solving for M, we obtain:

[tex]\frac{1.83x10^{-10}}{2.38x10^{-9}} =M+2.38x10^{-9}\\\\M=\frac{1.83x10^{-10}}{2.38x10^{-9}} -2.38x10^{-9}\\\\M=0.0769M[/tex]

Thus, the concentration of this NaCl solution is 0.0769M.

Best regards!

Answer:

82.04g

Explanation:

To solve this problem, you need to find the molar mass of HCl, which is the sum of the molar mass of H plus the molar mass of Cl. The molar mass of H is 1.008g/mol while the molar mass of Cl is 35.45g/mol. Thusly the molar mass of HCl is 36.458g/mol. You have 2.25 moles of HCl, so multiply the number of moles by the molar mass to get the mass in g. In this case it is 2.25mol * 36.458g/mol = 82.04g.

If I helped, a brainliest would be greatly appreciated!

Answer:

3 NiSO₄(aq) + 2 (NH₄)₃PO₄(aq) ⇒ Ni₃(PO₄)₂ + 3 (NH₄)₂SO₄

Explanation:

The question is missing but I think it must be about writing and balancing the equation.

Let's consider the unbalanced reaction that occurs when aqueous solutions of nickel(II) sulfate and ammonium phosphate are combined to form solid nickel(II) phosphate and a solution of ammonium sulfate. This is a double displacement reaction.

NiSO₄(aq) + (NH₄)₃PO₄(aq) ⇒ Ni₃(PO₄)₂ + (NH₄)₂SO₄

We will start balancing Ni atoms by multiplying NiSO₄ by 3.

3 NiSO₄(aq) + (NH₄)₃PO₄(aq) ⇒ Ni₃(PO₄)₂ + (NH₄)₂SO₄

Now, we have to balance S atoms by multiplying (NH₄)₂SO₄ by 3.

3 NiSO₄(aq) + (NH₄)₃PO₄(aq) ⇒ Ni₃(PO₄)₂ + 3 (NH₄)₂SO₄

Then, we need to balance N atoms by multiplying (NH₄)₃PO₄ by 2. This will be the balanced equation.

3 NiSO₄(aq) + 2 (NH₄)₃PO₄(aq) ⇒ Ni₃(PO₄)₂ + 3 (NH₄)₂SO₄

Answer:

fccdsetyujvreettyukknop

next time put a picture so people can help you more

Answer:

4.2 moles of sodium cyanide (NaCN) would be needed to produce  2.1 moles of sodium sulfate (Na₂SO₄).

Explanation:

The balanced reaction is:

H₂SO₄ + 2 NaCN → 2 HCN + Na₂SO₄

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound are necessary:

Then you can apply the following rule of three: if by stoichiometry to produce 1 mole of sodium sulfate 2 moles of sodium cyanide are necessary, then to produce 2.1 moles of sodium sulfate how many moles of sodium cyanide are necessary?

[tex]amount of moles of sodium cyanide=\frac{2.1 moles of sodium sulfate*2 moles of sodium cyanide }{1 mole of sodium sulfate}[/tex]

amount of moles of sodium cyanide= 4.2 moles

4.2 moles of sodium cyanide (NaCN) would be needed to produce  2.1 moles of sodium sulfate (Na₂SO₄).

Answer:

as per given balanced equation one mole Zn produces 1mole Hydrogen

when reacted with excess acid.

So 3 moles Zn will give 3moles Hydrogen

Explanation:

According to the balanced chemical equation, one mole of Zn produces one mole of hydrogen . Therefore, 3.86 moles of Zn metal will produce 3.86 moles of hydrogen gas.

Mole ratio refers to the ratio of the number of moles of one substance in a chemical reaction to the number of moles of another substance in the same reaction.

It is derived from the balanced chemical equation for the reaction, which indicates the relative amounts of each substance involved in the reaction.

Mole ratio is important in stoichiometry, which is the study of the quantitative relationships between reactants and products in a chemical reaction.

The given chemical reaction is written as follows:

Zn + 2 HCl ⇒ ZnCl₂ + H₂

According to the balanced chemical equation, one mole of Zn produces one mole of hydrogen . Therefore, 3.86 moles of Zn metal will produce 3.86 moles of hydrogen gas.

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Answer:

In inferential statistics, the null hypothesis is a default hypothesis that a quantity to be measured is zero.

Answer:

Step 1: The Unbalanced Chemical Equation. The unbalanced chemical equation is given to you. ...

Step 2: Make a List. ...

Step 3: Identifying the Atoms in Each Element. ...

Step 4: Multiplying the Number of Atoms. ...

Step 5: Placing Coefficients in Front of Molecules. ...

Step 6: Check Equation. ...

Step 7: Balanced Chemical Equation.

Explanation:

Answer:

THE MOLARITY IS 2.22 MOL/DM3

Explanation:

The solution formed was as a result of dissolving 37.5 g of Na2S in 217 g of water

Relative molecular mass of Na2S = ( 23* 2 + 32) = 78 g/mol

Molarity in g/dm3 is the amount of the substance dissolved in 1000 g or 1 L of the solvent. So we have;

37.5 g of Na2S = 217 g of water

( 37.5 * 1000 / 217 ) g = 1000 g of water

So, 172.81 g/dm3 of the solution

So therefore, molarity in mol/dm3 = mol in g/dm3 / molar mass

Molarity = 172.81 g/dm3 / 78 g/mol

Molarity = 2.22 mol/dm3

The molarity of the solution is 2.22 mol/dm3

Explanation:

Answer:

The primary means of conveying messages between human are verbal, nonverbal, and visual.

Explanation:

1. Verbal communication depends on words to deliver meaning.

2. Nonverbal communication occurs when meaning or messages are sent or received without the use of words.

3. Visual communication utilizes drawings, illustrations, pictures, colors, graphs, charts, and signs to share meaning.

The verbal method of talking is the primary means of conveying messages among humans.

Speech is spoken language used by people to communicate. The ability to modify voices through the articulation of laryngeal tones into audible oral speech is something that humans have learnt to do, despite the fact that many animals have voices of varied sorts and inflectional capacities.

A bellows-like respiration activator, which provides the driving energy in the shape of an updraft, a phonating sound generator in the larynx (low in the throat), to transform the energy, an audio tunable in the pharynx (higher in the throat), where the independent voice structure is moulded, and a speech-forming device that is connected in the oral cavity represent as the mechanisms for human speech (mouth).

The four structures usually, but not always, work closely together. Toneless whispering can provide audible communication without any voice, and some parts of yodelling that depend on pharyngeal and laryngeal alterations can produce phonation without oral articulation. Lipreading may be accomplished by silent articulation without voice or breath.

Therefore, speech is the primary method of communication among humans.

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Answer: b

Explanation:

its b

The missing component in the nuclear equation.1331 → X + -e will be 131Xe54. option B is correct.

The particles in the nucleus are changed, and one element is transformed into another element when particles in the nucleus are gained or lost.

Nuclear reactions are processes in which one or more nuclides are produced from the collisions between two atomic nuclei or one atomic nucleus and a subatomic particle.

This was the first observation of an induced nuclear reaction, that is, a reaction in which particles from one decay are used to transform another atomic nucleus.

The most notable man-controlled nuclear reaction is the fission reaction which occurs in nuclear reactors. A target nucleus are within the range of nuclear forces for the time allowing for a large number of interactions between nucleons.

therefore , option B is correct.

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Answer: it is D

Explanation:

Scientists can model the effects of reactant concentration on the speed of a reaction With an atomic model. Hence, D is correct.

Atomic model, in physics, a model used to describe the structure and makeup of an atom. Atomic models have gone through many changes over time, evolving as necessary to fit experimental data. For a more in-depth discussion of the history of atomic models, see atom: development of atomic theory.

Scientists use models to study atoms because atoms are extremely small and can't even be seen. If atoms can't be seen, it's easier to study and predict what atoms will do with a representation of them.

Models are useful tools in learning science which can be used to improve explanations, generate discussion, make predictions, provide visual representations of abstract concepts and generate mental models.

Therefore, Scientists can model the effects of reactant concentration on the speed of a reaction With an atomic model. Hence, D is correct.

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Answer:

0.185 moles of AlN

Explanation:

The equation is:

2Al  +  N₂  →  2AlN

This reaction indicates that 2 mol of aluminum can react to 1 mol of nitrogen to produce 2 moles of aluminum nitride.

We convert the aluminum's mass to moles

5 g/ 26.98 g/mol = 0.185 moles.

2 moles of Al are needed to produce 2 moles of AlN

so, ratio is 1:1

In conclussion we say:

0.185 moles of Al, must produce 0.185 moles of AlN

Answer:

The mass of oxygen gas required to produce 65.75 grams of steam is approximately 162.2 grams

Explanation:

From the question, we have the following chemical reaction equation;

2C₃H₁₈(l) + 25O₂ (g) → 16CO₂(g) + 18H₂O (g)

The molar mass of oxygen, O₂ = 32 g/mol

The molar mass of steam, H₂O = 18.01528 g/mol

25 moles of oxygen are required to produce 18 moles of steam

Therefore, according to  Proust's law of definite proportions;

(32 × 25) g of oxygen are required to produce (18 × 18.01528) g of steam

65.75 g of steam will be produced by (32 × 25)/(18 × 18.01528) × 65.75 g ≈ 162.2 g of oxygen O₂.

There are 3 individual atoms are represented in the reactants of the equation.

An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is surrounded by one or more negatively charged electrons. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.

In the reactants given, we have methane which has 2 individual atoms (Carbon and hydrogen) and oxygen has 1 individual atom.

Therefore, There are 3 individual atoms are represented in the reactants of the equation.

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Answer: Trust me 100% plz its loss of habitat wat they said

Explanation:

Answer:

acid + hydrogen

Explanation:

gives a good combination

Answer:

I would pick C

The element's most likely oxidation state related to its valence electrons "It indicates how many electrons are required to complete a full valence shell."

An atom's oxidation count would be the charge an atom would have been in the compound were made up of ions.

The amount of electrons given atom needs to lose or gain to achieve the electrical configuration of the next noble gas as well as inert gas is known as valence.

Its only electrons that an element loses were usually its valence electrons. The largest positive oxidation state of a substance is usually determined by the count of valence electrons.

The element's most likely oxidation state related to its valence electrons "It indicates how many electrons are required to complete a full valence shell."

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Answer:

1. Graphite rod (cathode)

2. Positive terminal

3. Solid zinc layer (anode)

4. Paste (reduction takes place here)

5. Negative terminal

Explanation:

This was the only thing i could find on it. hope this helps.

Answer:

Explanation:

• Label all parts.

1. Cathode or Graphite Rod

2. Positive terminal  

3. Anode or Solid Zinc layer  

4. Electrolyte Paste (reduction takes place here)

5. Negative Terminal (maybe this could also be the Zinc casing)  

• Label the cathode and the anode, including the charges on each.

The anode is the zinc layer is negatively charged and the cathode is the graphite rod is positively charged.  

• Show the flow of electrons.

The zinc casing is oxidized and the electrons flow along the zinc layer, into the negative terminal, and then out the negative terminal. The electrons move from the wire to the graphite rod. Then from the rod the electrons move to the paste, then the past goes through reduction. The anode gets a negative charge as electrons are released, and the cathode gets a positive charge as the electrons, which are negatively charged, are consumed.

• Explain how the cell works. Include the oxidation and reduction half-reactions in your explanation.

Alkaline dry cells use spontaneous oxidation-reduction reactions to convert chemical energy to electrical energy. According to the lesson ‘’Half-reactions are combined in a small casing, but still separated into half-cells.’’

Answer:

D.lodine

Explanation:

Lodine is a nonsteroidal anti-inflammatory drug . It works by reducing hormones that cause inflammation and pain in the body. Lodine is used to treat mild to moderate pain, osteoarthritis, or rheumatoid arthritis.

I hope it's helpful for you......

Answer:

All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum. Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays. Radiation is one way to transfer heat.

Answer:

D. Beta and Alpha

Explanation:

Just took it on Ap3x

Transmutation occurs during Beta and alpha radioactive decay, Hence option D is correct.

There are two types of nuclear reactions. Nuclear fission and nuclear fusion.

Nuclear reactions are classified into two types: fission and fusion. Nuclear fusion is the collision of two or more light nuclei to produce a heavier nucleus. Nuclear fusion happens in low-atomic-number elements such as hydrogen. Nuclear fusion is the inverse of nuclear fission, in which heavy atoms scatter and lighter elements are produced. Nuclear fusion and fission both provide massive quantities of energy.

A nuclear process in which low-atomic-number atomic nuclei fuse to form a heavier nucleus, releasing energy.

Every star in the universe, including the sun, is alive because of nuclear fusion. As a result of this activity, they create enormous amounts of heat.

Fission is a nuclear phenomenon in which a heavy nucleus spontaneously fractures or collides with another particle, releasing energy. Nuclear fission happens when an atom's nucleus splits into lighter nuclei as a result of a nuclear process. This decay can occur naturally due to radioactive decay, or it can be mimicked in a laboratory by creating the necessary conditions (bombarding with neutrinos). The overall mass of the resulting fragments is less than that of the original. The missing mass is converted into nuclear energy in the preceding step.

Hence option D is correct.

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Answer:

Sara's percentage yield of gas mileage is approximately 90.7%

Explanation:

Percentage yield of an process is given by the ratio of the observed, experienced (calculated), or actual yield to the theoretical yield of the process and then multiplying the result by 100%

[tex]Percentage \ yield = \dfrac{Actual \ yield}{Theoretical \ yield} \times 100[/tex]

The theoretical yield of Sara's car is the mileage advertised for the car which the car has 'ideally' which is 43 miles per gallon

∴ The theoretical yield = 43 miles/gallon

The actual yield is the yield of the car Sara is able to calculate, based on how she uses the car which is 39 miles per gallon

∴ The actual yield = 39 miles/gallon

Sara's percentage yield of gas mileage for the car, % yield, therefore is given as follows;

% yield = (39 miles/gallon)/(43 miles/gallon) × 100 ≈ 90.7%

Sara's percentage yield of gas mileage, % yield ≈ 90.7%.

Answer:

28.93 g/mol

Explanation:

This is an extension of Graham's Law of Effusion where [tex]\frac{R1}{R2} = \sqrt{\frac{M2}{M1} } = \frac{t2}{t1}[/tex]

We're only talking about molar mass and time (t) here so we'll just concentrate on [tex]\sqrt{\frac{M2}{M1} } = \frac{t2}{t1}[/tex]. Notice how the molar mass and time are on the same position, recall effusion is when gas escapes from a container through a small hole. The time it takes it to leave depends on the molar mass. If the gas is heavy, like Xe, it would take a longer time (4.83 minutes). If it was light it would leave in less time, that gives us somewhat an idea what our element could be, we know that it's atleast an element before Xenon.

Let's plug everything in and solve for M2. I chose M2 to be the unknown here because it's easier to have it basically as a whole number already.

[tex]\sqrt{\frac{M2}{131} } = \frac{2.29}{4.83}[/tex]

The square root is easier to deal with if you take it out in the first step, so let's remove it by squaring each side by 2, the opposite of square root essentially.

[tex](\sqrt{\frac{M2}{131} } )^2= (\frac{2.29}{4.83})^2[/tex]

[tex]{\frac{M2}{131} } = (0.47)^2[/tex]

[tex]{\frac{M2}{131} } = 0.22[/tex]

M2= 0.22 x 131

M2= 28.93 g/mol