For each reaction indicated below, will a reaction move in the forward (right) or reverse (left) direction? (Of the reaction arrows presented in each reaction, select the arrow - via the multiple choice circle before it - that best indicates the acid-base equilibrium position.)

Answer:c

Explanation:because the percent of oxygen by mass is not a funcion

The compounds A, B and C are ammonium chloride, ammonia gas and silver chloride respectively.

Ammonium chloride,  is a white crystalline solid which is soluble in water. On heating with sodium hydroxide it will produce ammonia gas, which is a colorless gas and has a odor or pungent smell.

So,  Ammonia gas will turn red litmus into blue as it's pH is 11.6.

When Ammonium chloride reacts with silver nitrate  in  presence of dilute Nitric acid ,  it produces Silver chloride and Ammonium nitrate

AgCl is soluble in Ammonia because it can form complexes which

makes it behave like an ion, making it soluble.

Therefore, Compound A is Ammonium chloride,

B is ammonia gas

and C is Silver chloride.

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The complete question is

A white solid A when heated with sodium hydroxide solution gives a pungent gas B which turns red litmus paper blue. The solid when dissolved in dilute nitric acid is treated with Silver nitrate solution to give white precipitate C, which is soluble in ammonia.

(A) What are the substance A, B, and C?

The ones that can NOT be used as an acid-base buffer solution are 0.5 M HNO₃ and 0.5 M NaNO₃, as well as 0.3 M HCl and 0.3 M NaOH

Buffer solution is an aqueous solution that is consisted of a mixture of a weak acid and its conjugate base OR a weak base and its conjugate acid. Its main function is to resist pH change upon the addition of a basic or acidic component(s). In other words, buffer solutions are able to maintain the pH of the solution relatively stable. It does that by absorbing excess hydrogen or hydroxide ions.

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Answer:

the basic unit of an ionic compound is called a formula unit and the basic unit of a covalent compound is a molecule.

Answer:

20 atoms total

Explanation:

N (3) + H (12) + P (1) + O(4) = 20 atoms

Answer:

Where are the answer choices

?

4 moles of Fe react with 3 moles of oxygen. Therefore, the mole ratio of iron to iron oxide in this process is 4:2.

The chemical element with the atomic number 8 and symbol O is called oxygen. It belongs to the periodic table's halogen group, is a very reactive nonmetal, and an oxidizing agent that easily produces oxides with most elements as well as other compounds.

The non-metallic element oxygen occurs naturally as a molecule. Two oxygen atoms that are tightly bound together make up each molecule. Oxygen is in a gaseous form at ambient temperature due to its low melting and boiling temperatures.

According to scientists, the oceans produce between 50 and 80 percent of the oxygen used on Earth. Oceanic plankton, which includes floating plants, algae, and certain bacteria that can photosynthesize, is the main source of this production.

Thus, 4 moles of Fe react with 3 moles of oxygen.

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Approximately 1.50 moles of peanuts in 9.00 * 10^{24} peanuts

To answer your question, we will use the concept of moles, which is a unit of measurement in chemistry that helps to relate the number of particles (in this case, peanuts) to a more manageable and comparable quantity.
First, we need to know the number of peanuts in one mole. This value is known as Avogadro's number, which is approximately 6.022 * 10^{23} particles per mole. Now, we will use this information to calculate the number of moles of peanuts in the given amount.
Step 1: Identify the given amount of peanuts:
9.00 * 10^{24} peanuts
Step 2: Divide the given amount of peanuts by Avogadro's number:
\frac{9.00 * 10^{24} peanuts) }{ (6.022 * 10^{23} peanuts/mole)}
Step 3: Perform the calculation:
(\frac{9.00 }{ 6.022}) * (\frac{10^{24 }10^{23}) ≈ 1.495
Step 4: Round the answer to a reasonable number of significant figures (in this case, three):
1.50 moles

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Answer:

Chemical Change

Explanation:

Mixing these elements together creates a chemical change

Making of a salad dressing is a physical change  as there is no change in the chemical composition.

Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.

Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.Magnetism, crystallization, formation of alloys are all reversible and hence physical changes.

They involve only rearrangement of atoms and are often characterized to be changes which are reversible.

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The number of moles of NaF that will be produced from 3moles of Na is 3 moles.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, sodium reacts with fluorine as follows:

2Na+ F₂ → 2NaF

Based on the above equation, 2 moles of Na will produce 2 moles of NaF

This means that 3 moles of Na will produce 3 moles of NaF.

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The number of atoms of silicon present in a sample that contained 4.66 × 10³⁰ grams is 9.99 × 10⁵² atoms.

The number of atoms of a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number as follows:

no of atoms = no of moles × 6.02 × 10²³

However, the number of moles in 4.66 × 10³⁰ grams must be calculated as follows:

moles = 4.66 × 10³⁰ grams ÷ 28.0855g/mol

moles = 1.659 × 10²⁹ moles

Number of atoms = 1.659 × 10²⁹ moles × 6.02 × 10²³

no of atoms = 9.99 × 10⁵² atoms

Therefore, 9.99 × 10⁵² atoms is the number of atoms of silicon in the sample.

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The sample age = 17,190 years

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually radioactive elements have an unstable atomic nucleus.  

The main particles are emitted by radioactive elements so that they generally decay are alpha (α), beta (β) and gamma (γ) particles  

General formulas used in decay:  

\(\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}\)

t = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

It is assumed that the half life of carbon is 14 = 5730 years

t1/2 = 5730 years

Nt=3.125 g

No=25 g

\(\tt 3.125=25\dfrac{1}{2}^{t/5730}\\\\0.125=\dfrac{1}{2}^{t/5730}\\\\\dfrac{1}{2}^3=\dfrac{1}{2}^{t/5730}\\\\3=t/5730\rightarrow t=17,190~years\)

The water of 17.99 g forms when 63g of HNO₃ mixes with60g of NaOH

When nitric acid and sodium hydroxide are mixed, a neutralization reaction takes place, with the salt created by the two substances and water serving as the reaction result. The chemical reaction to the statement in this instance is:

HNO₃ + Na(OH) ⇒ NaNO₃ + H₂O

It is determined whether there is one limiting reagent and one in excess, or if both react entirely, by calculating the molar masses of the reagents and using the masses provided by the statement to compute the ratio in which these compounds are combined.

• The formula for HNO₃'s molar mass is 3xmO + mH + mN, or 3x15.99g + 1g + 14g = 62.97 g/mol.

• The formula for Na(OHmolar )'s mass is: mO + mH + mNa = 15.99g + 1.00g + 22.99g = 39.98 g / mol.

Nitric acid is immediately apparent to be the limiting reagent.

Since there are initially 60 g of hydroxide, some of it will stay unreacted because the balanced equation's stoichiometric ratio states that 1 mole of acid reacts with 1 mole of hydroxide. As a result, 63 g of HNO3 react with 40 g of hydroxide. This proves that acid is the limiting reagent, and calculations to determine how much water will form must be based on this substance.

For 63g of HNO₃ 18g of water is formed. Then,

for 62.97 g of HNO₃,

= 18 g x 63 g equals/62.97 g  

= 17.99 g of water.

As a result, the correct response is that 17.99 g of water will form.

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The graph shows that as mass increases, kinetic energy increases exponentially. This means that as the mass of an object increases, the kinetic energy increases by a larger and larger amount.

This can be seen by the upward sloping line on the graph. This can be seen in the graph by the steepness of the line, which shows that the increase in kinetic energy is growing faster and faster as the mass increases. Additionally, the graph shows that the rate of increase in kinetic energy is greater for lower masses than for higher masses, which indicates an exponential increase. This can be seen by the upward sloping line on the graph.

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The aluminum hydroxide is dissolved, as well as any other acids or bases present that can affect the pH. Without this information, it is not possible to provide a specific pH value for the solution.

To determine the pH of a solution containing aluminum hydroxide (Al(OH)3), we need additional information. Aluminum hydroxide is a weak base, and its pH will depend on its dissociation in water.

First, we can calculate the number of moles of aluminum hydroxide using its molar mass. The molar mass of Al(OH)3 is 78 grams/mol (27 g/mol for aluminum and 3 × 17 g/mol for three hydroxide groups). Therefore, we have 78 g / 78 g/mol = 1 mol of Al(OH)3.

Since aluminum hydroxide is a weak base, it will undergo partial dissociation in water, releasing hydroxide ions (OH-) and aluminum ions (Al3+). The hydroxide ions will increase the pH of the solution.

However, to determine the pH accurately, we need to know the initial volume of water.

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The Avogadro's number is the constant number for the number of atoms or molecules represented in 1 mol, this number is equal to 6.022*10^23, to find out how many molecules there are in 6.0 moles we can set up this equation:

6.0 moles of CH4 * 6.022*10^23 molecules / 1 mol of CH4

The answer will be 3.61*10^24 molecules of CH4

During exercise, hemoglobin (Hb) has a lower affinity to oxygen (O₂) and can more easily release O₂ to the tissues.

When we exercise, our muscles need more oxygen to produce energy. As a result, hemoglobin's affinity for oxygen decreases, allowing it to release oxygen more easily to the tissues that need it. This process is known as the Bohr effect and is an important part of the body's response to exercise.
So, in short, during exercise, Hb has a lower affinity to O₂ and can more easily release O₂ to the tissues.

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Answer:

Here's what I get  

Explanation:

(i) Voltaic cell

A voltaic cell is a device that uses a chemical reaction to produce electrical energy.

(ii) Overall Cell Potential

The standard reduction potentials for the half-reactions are

                               ℰ°/V

Cu²⁺ + 2e⁻ ⇌ Cu    0.34

Zn²⁺ + 2e⁻ ⇌ Zn   -0.76

The half-reaction with the more positive potential is the reduction half-reaction. It is the reaction that occurs at the cathode.

The half-reaction with the more negative potential is the oxidation half-reaction. It is the  reaction that occurs at the anode.

We reverse that half-reaction and subtract the voltages to get the cell reaction.

                                                          ℰ°/V

Cathode:  Cu²⁺ + 2e⁻ ⇌ Cu              0.34

Anode:     Zn ⇌ Zn²⁺ + 2e⁻              -0.76

Cell:          Zn +  Cu²⁺ ⇌ Zn²⁺ + Cu    1.10

\(\mathcal{E}_{\text{cell}}^{\circ} = \mathcal{E}_{\text{cat}}^{\circ} - \mathcal{E}_{\text{an}}^{\circ} = \text{0.34 V} - \text{(-0.76 V)} = \text{0.34 V} + \text{0.76 V} = \textbf{1.10 V}\)

(iii) Diagram

The specific labels will depend on your textbook.

They are often as follows.

a. Electron flow

b. Voltmeter or lightbulb

c. Electron flow

d. Cathode or Cu

e. Cu²⁺(aq) and NO₃⁻(aq)

f. Salt bridge

g. Zn²⁺(aq) and NO₃⁻(aq)

h. Anode or Zn

The salt bridge enables ions to flow in the internal circuit and to maintain electrical neutrality in the two compartments.

It often consists of a saturated solution of KCl.

As Zn²⁺ ions form in the anode compartment, Cl⁻ ions move in to provide partners for them.

As Cu²⁺ ions are removed from the cathode compartment, K⁺ ions move in to replace them.

Answer:a. Electron flow

b. Voltmeter or lightbulb

c. Electron flow

d. Cathode or Cu

e. Cu²⁺(aq) and NO₃⁻(aq)

f. Salt bridge

g. Zn²⁺(aq) and NO₃⁻(aq)

h. Anode or Zn

Explanation:

When doubling the number of the moles of the HCl decrease the rate of HCl production because the acid convertase enzyme is converting HCl back into H⁺ and Cl⁻.

The reaction is as follows :

H⁺  +  Cl⁻  ⇄ HCl

If we double the number of the moles of the HCl , it decreases the rate of the HCl production because of the reason that  the acid convertase enzyme is converting the HCl back into the H⁺ and Cl⁻. The purpose of the  enzyme is to allow the conversion of the reactant to the product and the product back to the reactant

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Answer:

Explanation:

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

\(density = \frac{mass}{volume} \\\)

From the question

mass = 992 g

volume = 1000 mL

We have

\(density = \frac{992}{1000} \\ = 0.992\)

We have the final answer as

Hope this helps you

Answer:

There are two basic methods for breaking the bonds in saltwater: thermal distillation and membrane separation. Thermal distillation involves heat: Boiling water turns it into vapor—leaving the salt behind—that is collected and condensed back into water by cooling it down.

Answer:

Temperature <3

Explanation:

Since it's use to measure kinetic energy, have a nice day! :)

Answer:

c. ammonia window cleaner

Explanation:

Window cleaners contain ammonia (a base) for the purpose of removing the dust and grease on the windows.

digestive juices, orange(a citrus) juice, and vinegar are all highly acidic.

... give me brainliest please :)) ...

Answer:

Atoms gain valence electrons to form anions.

Explanation:

Answer: Your answer is Chemical weathering.

Hope this helps!

Answer:

chemical

Explanation:

I hope it help.........

The value of ΔH for the reaction CO(g) + H₂(g) + O₂(g) → CO₂(g) + H₂O(g) is -1272 kJ.

To calculate the enthalpy change (ΔH) for the given reaction, we can use Hess's law, which states that the overall enthalpy change of a reaction is equal to the sum of the enthalpy changes of the individual reactions involved.

Given the enthalpy changes:

1. 2 C(s) + O₂(g) → 2 CO(g)... ∆H = -222 kJ

2. C(s) + O₂(g) → CO₂(g)... ∆H = -394 kJ

3. 2 H₂(g) + O₂(g) → 2 H₂O(g)... ∆H = -484 kJ

We need to manipulate these reactions to obtain the desired reaction:

1. Reverse reaction 2: CO₂(g) → C(s) + O₂(g)... ∆H = +394 kJ

2. Multiply reaction 2 by 2 to balance carbon atoms: 2 CO₂(g) → 2 C(s) + 2 O₂(g)... ∆H = -788 kJ

3. Leave reaction 3 unchanged: 2 H₂(g) + O₂(g) → 2 H₂O(g)... ∆H = -484 kJ

By adding reactions 2 and 3, we obtain the desired reaction:

CO(g) + H₂(g) + O₂(g) → CO₂(g) + H₂O(g)... ∆H = -788 kJ + (-484 kJ) = -1272 kJ

Therefore, the value of ΔH for the given reaction is -1272 kJ.

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Answer:

Boyle's law states that at a fixed temperature, the volume of gas is inversely proportional to the pressure exerted by the gas.

Answer:

Boyle's Law is a basic law in chemistry describing the behavior of a gas held at a constant temperature. The law, discovered by Robert A. Boyle in 1662, states that at a fixed temperature, the volume of gas is inversely proportional to the pressure exerted by the gas.

Explanation:

An engine using gasoline to power a car and mixing glue and laundry powder to create putty are both examples of chemical reactions.

Gasoline is considered an energy source due to its ability to release stored chemical energy in the form of heat and mechanical work when it is burned in an engine. When gasoline is ignited in an engine, the chemical energy stored in its molecular bonds is released, causing a rapid combustion reaction that generates heat and expanding gases that push the pistons and create mechanical work.

The energy content of gasoline is typically measured in units of joules or British thermal units (BTUs), which are used to quantify the amount of energy released during combustion. Gasoline is a widely used and important energy source, but its combustion also produces harmful emissions that contribute to air pollution and climate change.

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The Big Bang theory claims that hydrogen was the first element to form.

Atomic number 1 and the letter H are used to identify the chemical element hydrogen. In the cosmos, it makes up around 75% of the elemental mass and is the lightest and most prevalent element. At room temperature and pressure, hydrogen is a colorless, tasteless, odorless gas that is non-toxic.

The Big Bang theory claims that hydrogen was the first element to form. The universe was made of a hot, dense plasma of protons, neutrons, and electrons in the initial moments following the Big Bang. These particles merged when the cosmos cooled and expanded to create hydrogen atoms, which subsequently fused to create the first stars. Helium, carbon, oxygen, and other atoms that make up the universe we see today were converted into heavier elements through nuclear fusion in these stars.

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The IUPAC name for (CH3)3CCH2CH(CH3)2 is 3,3-Dimethyl-2-pentene.

The International Union of Pure and Applied Chemistry (IUPAC) is a scientific organization in charge of standardizing the names of chemicals and chemical compounds. It is an international authority on chemical nomenclature, symbols, terminology, and measurements. In order to provide a systematic naming system to the compounds, IUPAC has established a set of rules.

The IUPAC name for the given compound is 3,3-Dimethyl-2-pentene.

The parent hydrocarbon of the compound is a pentene because it has five carbon atoms in an unbranched chain. The double bond between the second and third carbon atoms is indicated by the "-ene" suffix in the name. The IUPAC name is determined by numbering the carbon atoms in the chain so that the double bond is between carbon atoms 2 and 3.

The two methyl groups attached to carbon 3 and the three methyl groups attached to carbon 3 are indicated by the prefixes "3,3-dimethyl" and "trimethyl," respectively. Thus, the IUPAC name for the compound is 3,3-Dimethyl-2-pentene.

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