A solution containing which one of the following pairs of substances will be a buffer solution: A) KBr, HBr B)CsF,HF C) NaI, HI D) RbCl, HCl E) None of these

Answer:

70.26 moles

Explanation:

1 mole of potassium will contain 6.02 x 10²³ atoms of potassium

6.02 x 10²³ atoms of potassium  = 1 mole

4.23 x 10²⁵ atoms of potassium = 4.23 x 10²⁵ / 6.02 x 10²³

= 70.26 moles .

Answer:

True.

Explanation:

According to this, an object's rate of change in velocity is directly proportional to the force used and moves in the direction of the applied force. The following formula encapsulates it: force (N) = mass (kg) x acceleration (m/s2). A constant mass item will therefore accelerate in direct proportion to the force exerted.

Answer:

true, I am pretty sure it's true

Answer:

Actual yield and theoretical yield

Answer:

163 L CO₂

Explanation:

Step 1: Find conversion

1 mol = 22.4 L at STP

Step 2: Use Dimensional Analysis

\(7.29 \hspace{2} mol \hspace{2} CO_2(\frac{22.4 \hspace{2} L \hspace{2} CO_2}{1 \hspace{2} mol \hspace{2} CO_2} )\) = 163.296 L CO₂

Step 3: Simplify

We have 3 sig figs

163.296 L CO₂ ≈ 163 L CO₂

Answer:

1 and 3

Explanation:

Answer: A and B or 1 and 3

Explanation:

The preparation of bases involves several methods that are used to create substances with basic or alkaline properties are Reaction of metal with water, Reaction of metal oxide with water, Neutralization reaction, Ammonia gas dissolving in water and Partial neutralization of a strong base with a weak acid.

Reaction of metal with water: Certain metals, such as sodium or potassium, react with water to form hydroxides. For example, sodium reacts with water to produce sodium hydroxide (NaOH).

Reaction of metal oxide with water: Metal oxides, such as calcium oxide (CaO) or magnesium oxide (MgO), can be added to water to form metal hydroxides. This process is known as hydration. For instance, when calcium oxide reacts with water, it forms calcium hydroxide (Ca(OH)2).

Neutralization reaction: Bases can be prepared by neutralizing an acid with an appropriate alkaline substance. This involves combining an acid with a base to form water and a salt. For example, mixing hydrochloric acid (HCl) with sodium hydroxide (NaOH) results in the formation of water and sodium chloride (NaCl).

Ammonia gas dissolving in water: Ammonia gas (NH3) can dissolve in water to form ammonium hydroxide (NH4OH), which is a weak base.

Partial neutralization of a strong base with a weak acid: Mixing a strong base, such as sodium hydroxide (NaOH), with a weak acid, like acetic acid (CH3COOH), results in the formation of a base with a lesser degree of alkalinity.

These methods are utilized in laboratories, industries, and various applications where bases are required, such as in the production of cleaning agents, pharmaceuticals, and chemical reactions. Each method has its own advantages and specific applications depending on the desired base and its properties.

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What are the various methods involved in the preparation of bases?

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Explanation:

To balance this chemical equation-

see

Balanced form:-

CaO + 2 HCl ==. CaCl2 + H2O

.

Comparing the electronegativities of the two elements is one method of predicting the type of bond that will form between them.

Ionic bonds are produced between atoms of metals and non-metals where the metal loses an electron to complete its octet and the non-metal acquires that electron to complete its octet. Covalent bonds are formed when two atoms share electrons to complete their octets.

Ionic chemicals are bound together by ionic bonds, whereas covalent compounds are held together by strong covalent bonds. While covalent molecules are normally insoluble in water, ionic compounds are. Additionally, covalent molecules are typically more flammable than ionic ones.

If the electronegativity of the two atoms differs by enough to allow one to totally draw an electron away from the other, the connection is ionic.

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Answer:

pH = 9.37

Explanation:

The reaction of HZ with NaOH occurs as follows:

HZ + NaOH → H₂O + Na⁺ + Z⁻

When the reaction is in the equivalence point, the moles added of HZ = Moles of NaOH.

At equivalence point, you will have in solution just NaZ that is in equilibrium with water as follows:

Z⁻(aq) + H₂O(l) ⇄ OH⁻(aq) + HZ(aq)

Where K of equilibrium is Kw / Ka = 1x10⁻¹⁴ / 2.4x10⁻⁶ = 4.17x10⁻⁹

And K is defined as:

K = 4.17x10⁻⁹ = [OH⁻] [HZ] / [Z⁻]

To solve this question we must find  [Z⁻] and as [OH⁻] and [HZ] comes from the same equilibrium, both are equal and we can find [OH⁻] in order to solve pH:

Moles NaOH added = Moles HZ:

0.010L * (0.39mol / L) = 3.9x10⁻³ moles HZ = Moles NaOH added

The volume of 0.200M NaOH must be:

3.9x10⁻³ moles * (1L / 0.200moles) = 0.0195L.

The moles of HZ = Moles Z⁻ after the reaction and the volume is 0.010L + 0.0195L = 0.0295L. Thus, [Z⁻] is:

[Z⁻] = 3.9x10⁻³ moles / 0.0295L

[Z⁻] = 0.132M

Replacing in K expression:

4.17x10⁻⁹ = [OH⁻] [HZ] / [Z⁻]

4.17x10⁻⁹ = [X] [X] / [0.132]

5.51x10⁻¹⁰ = X²

X = 2.35x10⁻⁵M = [OH⁻]

As pOH = -log [OH⁻]

pOH = 4.63

And pH is

pH = 14 -pOH

The proeutectoid phase is \(\alpha\) - ferrite, total ferrite and cementite form are 5.62kg and 0.38kg, pearlite and the proeutectoid phase form are 2.52kg and 3.48kg..

The term "roeutectoid" refers to a phase that occurs during cooling before eutectoid austenite disintegrates. In that it is the first phase to form after the austenite phase, it is analogous to fundamental solids. Thus, proeutectoid ferrite will result from hypoeutectoid steel, and proeutectoid cementite from hypereutectoid steel.

We have,

m = 6kg

\(C_0\) = 0.45wt%C

T = 727 C

A) Proeutectoid phase is \(\alpha\) - ferrite.

B) From portion of the Fe-Fe3C phase diagram in Figure 9.31 we can find:

\(C_\alpha\) = 0.022

\(C_{Fe_3C}\) = 6.70

Calculating mass fraction:

\(W_\alpha = \frac{C_{Fe_3C}-C_o}{C_{Fe_3C}-C_\alpha } = \frac{6.70-0.45}{6.70-0.022}\)

\(W_\alpha\) = 0.936

Calculating how many kilograms each of total ferrite and cementite form::

\(M_\alpha =W_\alpha .m=0.936.6=5.62\)

\(M_{Fe_3C}=6-M_\alpha =6-5.62=0.38kg\)

C) We use the lever rule in conjunction with a tie line that extends from the phase boundary (0.022) to the eutectoid composition (0.76) in as much as pearlite is the transformation product of austenite having this composition:

\(W_P=\frac{T}{T=U} =\frac{0.45-0.022}{0.76-0.022} =0.58\)

Mass fraction of α-phase is equal to:

\(W_\alpha =1-W_P=0.42\)

Calculating how many kilograms each of pearlite and the proeutectoid phase form:

\(M_\alpha =W_\alpha =0.42.6=2.52kg\\M_P=6-2.52=3.48kg\)

D) Schematically sketching the resulting microstructure:

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Explanation:

isotope are atom of the same elements with the same number of protons, electron and different number of neutrons.

Answer:

8

Explanation:

Its official chemical symbol is O, and its atomic number is 8, which means that an oxygen atom has eight protons in its nucleus

The purpose of adjusting the vacuum in an Up in Smoke Lab is to control the pressure within a closed system, typically a distillation setup, in order to perform efficient separations of the components in a mixture based on their boiling points.

A vacuum pump is used to reduce the pressure in the system, allowing the components with lower boiling points to boil at lower temperatures, thereby facilitating their separation from those with higher boiling points. By controlling the vacuum, the lab can precisely adjust the conditions under which the separation takes place, leading to more accurate and reproducible results.

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Answer:

3 valence electrons

Explanation:

Because aluminum has three, that means three fluorines can bond. The make the formula AlF3, also known as aluminum trifluoride. Each of the fluorine atoms gets an electron to fill their shell, and the aluminum loses three, giving it a filled shell too (remember, aluminum has three extra electrons).

Answer:

The oxide is basic, X must be a group two metal

Explanation:

The oxide XO2 must be an inorganic peroxide of a group two element. Inorganic peroxides of group two elements are highly basic because they dissolve in water to yield the corresponding metal hydroxides. These metal hydroxides are strongly basic solutions with a very high pH. Hence X may be Calcium, magnesium, barium, strontium or radium.

Group two metal peroxides include; CaO2, MgO2,BaO2 etc. They all dissolve in water to give corresponding basic solutions. For instance, calcium peroxide reacts with water as follows; CaO2 (s) + 2H2O(l) --------->Ca(OH)2(aq) + H2O2(aq). The production of Ca(OH)2 makes the solution basic. The hydrogen peroxide produced decomposes to water and oxygen.

Answer:

2.38 g of oxygen (O2).

Explanation:

What is given?

Mass of potassium chlorate (KClO3) = 6.06 g.

Molar mass of KClO3 = 122.4 g/mol.

Molar mass of oxygen (O2) = 32 g/mol.

Step-by-step solution:

First, let's state the balanced chemical equation. Remember that the decomposition of a compound produces two or more products:

Now, let's convert 6.06 g of KClO3 to moles using its molar mass:

You can see in the chemical equation that 2 moles of KClO3 produce 3 moles of O2. By doing a rule of three with this data, we obtain that:

The final step is to convert from 0.0743 moles of O2 to grams using its molar mass, like this:

The answer is that we will produce 2.38 g of oxygen (O2) from the decomposition of 6.06 g of potassium chlorate (KClO3).

Answer:

b

Explanation:

Answer: A

Explanation:

Answer:

Some chemical reactions will not generate products is because the molecules in a chemical reaction aren´t able to line up with each other correctly.

Explanation:

Answer:

The reason that a chemical reaction doesn't happen is that the molecules weren't able to line up with each other correctly. It's the same as you extending your right hand and your friend extending his right hand at the same time.

Explanation:

Answer:A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it. The plateaus on the curve mark the phase changes. The temperature remains constant during these phase transitions.

Answer:

3

Explanation:

Protons and electrons are always the same.

Hope this is correct and helpful

HAVE A GOOD DAY!

Answer:

Tuberculosis is a potentially serious infectious bacterial disease that mainly affects the lungs. And how you can get Tuberculosis is that  it can be spread through the air from one person to another, when the person with tuberculosis coughs, sneezes or anything like that and you inhale that air you could have those germs which can cause you to get tuberculosis.

Explanation:

I hope this helps! Have a great day!

Answer:

Yes, it does. Density is directly related to mass and volume. To find the density, we would have to divide its mass by its volume.

Explanation:

For example: If volume increases but the mass does not increase, the density will decrease. Also, if an object has a small mass and large volume, it would have a low volume.

Answer: Physical properties, but not in its identity

Explanation:

Physical changes only change the substances physical properties, not the substance’s identity

When talking about physical properties of matter, a substance could change its state or form, but the substance is not changed into a new substance. In other words, the composition of matter is not changed. Physical properties are used to describe and classify matter. Three examples of physical properties of matter are density, color, and boiling point.

Physical properties of matter are characteristics that can be observed or measured without changing the substance into a new substance. These properties help us describe and classify different types of matter. When a substance undergoes a change in its physical state or form, such as melting, freezing, evaporating, or condensing, its physical properties can change, but the composition of the substance remains the same.

For example, when ice melts into liquid water, the state of the substance changes from solid to liquid, but it is still composed of the same water molecules. Similarly, when a substance changes its color or boiling point, it is still the same substance, just with different observable properties.

Three examples of physical properties of matter are:

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When antacid reacts with HCl to produce H2CO3 it produce fizzy gas react due to a double displacement reaction.

Table salt and carbonic acid are produced in a two fold displacement process when hydrochloric acid and antacid are combined. Additionally, due to the instability of carbonic acid, it will decompose into water and carbon dioxide, emitting a "fizzy" gas.

Strong acid hydrochloric acid is denoted by the chemical formula HCl. The primary ingredient in antacids is sodium bicarbonate, sometimes known as baking soda and has the chemical formula NaHCO3.

Antacid undergoes a chemical reaction when it reacts as a carbonate with powerful acids like hydrochloric acid to create compounds with a different chemical makeup from the beginning components. Similar reactions will be produced by other carbonates, such as calcium carbonate, which makes up the majority of Tums.

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Answer:

thank u for the points

Explanation:

81 g of Al reacts with plenty of chlorine to form 3 moles of aluminum chloride (AlCl3).

To find the number of moles of aluminum chloride (AlCl3), we need to first calculate the number of moles of aluminum (Al) reacting with chlorine (Cl2) based on the given mass of Al.

Given: Mass of Al = 81 g; Molar mass of Al = 27 g/mol

Number of moles of Al = Mass of Al / Molar mass of Al

= 81 g / 27 g/mol

= 3 moles of Al

From the balanced chemical equation, we know that 2 moles of Al react with 3 moles of Cl2 to form 2 moles of AlCl3.

Thus, for 3 moles of Al, we need 3/2 * 3 moles of Cl2 = 4.5 moles of Cl2.

And, for 2 moles of AlCl3, we need 4.5/3 * 2 moles of AlCl3 = 3 moles of AlCl3.

Therefore, 81 g of Al reacts with plenty of chlorine to form 3 moles of aluminum chloride (AlCl3).

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