calculate the ph of the resulting solution if 25.0 ml of 0.250 m hcl(aq) is added to 35.0 ml of 0.250 m naoh(aq)

Answer:

a . knowledge and existing theories .

b. falsifiable scope

a) Subscript (s) means solid or precipitate.

b) CdSO₄ (aq) → Cd²⁺ (aq) + SO₄²⁻(aq) and K₂S(aq) → 2K⁺ (aq) + S²⁻ (aq). There are 4 types of ions present in the solution Cd²⁺, SO₄²⁻, 2K⁺ and S²⁻.

c) Yellow to orange color precipitate will be seen after this reaction.

d) The reaction is known as double displacement or a precipitation reaction.

e) 2K⁺ and SO₄²⁻ are the ions still present in the solution.

The detailed answer to the questions related to the given equation are as follows:

Given equation: CdSO₄ (aq) + K₂S (aq) → CdS (s) + K₂SO₄ (aq)

a) The subscript (s) means "solid." In this reaction, CdS is a solid product formed by the reaction of aqueous CdSO₄ and K₂S.

b) When cadmium sulfate (CdSO₄) dissolves in water, it dissociates into ions:

CdSO₄ (aq) → Cd²⁺ (aq) + SO₄²⁻ (aq)

Similarly, when potassium sulfide (K₂S) dissolves in water, it dissociates into ions:

K₂S (aq) → 2K⁺ (aq) + S²⁻ (aq)

In this solution, there are four types of ions are present: Cd²⁺, SO₄²⁻, 2K⁺, and S²⁻.

c) Cadmium sulfide (CdS) has a yellow to orange color and is insoluble in water. When you mix cadmium sulfate (CdSO₄) and potassium sulfide (K₂S), you would expect to see a yellow to orange precipitate forming, which is cadmium sulfide (CdS).

d) The name for this type of reaction is a double displacement reaction or a precipitation reaction.

e) After the reaction, the soluble product potassium sulfate (K₂SO₄) is formed, which dissociates into ions in the solution. The ions still present in the solution after the reaction are: 2K⁺ (aq) + SO₄²⁻ (aq).

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The number of hamburgers sold on Wednesday is 275.

Let's assume the number of hamburgers sold is x.

According to the given information, the number of cheeseburgers sold is 70 more than the number of hamburgers. So, the number of cheeseburgers sold can be expressed as x + 70.

The total number of hamburgers and cheeseburgers sold is given as 620, so we can set up the following equation:

x + (x + 70) = 620

Combining like terms, we get:

2x + 70 = 620

Subtracting 70 from both sides of the equation:

2x = 550

Dividing both sides by 2:

x = 275

Therefore, the number of hamburgers sold on Wednesday is 275.

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Answer:

I believe C

Explanation:

Answer:

C because both are way too big to pass through the filter

Explanation:

The frequency of the color light, given that it has a wavelength of 5.0×10⁻⁷ m is 6.0×10¹⁴ Hertz (last option)

First, we shall list out the given parameters from the question. This is shown below:

Speed, wavelength and frequency of wave are related by the following formula:

Velocity (v) = wavelength (λ) × frequency (f)

Inputting the given parameters, we can obtain the frequency as shown below:

3×10⁸ = 5.0×10⁻⁷ × frequency

Divide both sides by 5.0×10⁻⁷

Frequency = 3×10⁸ / 5.0×10⁻⁷

= 6.0×10¹⁴ Hertz

Thus, we can conclude that the frequency of the color light is 6.0×10¹⁴ Hertz (last option)

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E could be "Ca, Ba, Sr".

When a main group element reacts with fluorine to form a binary compound, the resulting compound is typically an ionic compound with a 1:2 ratio of cations to anions. In this case, the compound formed is EF2.

Based on this information, we can identify the possible main group elements that could form an EF2 compound. Among the main group elements, the alkaline earth metals in Group 2 of the periodic table are known to form ionic compounds with a 2+ charge. These elements include calcium (Ca), barium (Ba), and strontium (Sr).

Therefore, the possible chemical symbols for E in the given reaction are "Ca, Ba, Sr". These elements react with fluorine to form EF2 compounds, where the cation has a 2+ charge and combines with two fluorine anions to achieve a stable 1:2 ratio.

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Stable isotopes of an element have the same number of protons in their atomic nuclei, but a different number of neutrons.

As a result, isotopes of an element have the same atomic number and therefore the same chemical properties, but they have different atomic masses.

The six stable isotopes of selenium have the same number of protons (34) but different numbers of neutrons, which results in different atomic masses. These isotopes therefore have the same atomic structure in terms of the number of protons, electrons and the arrangement of electrons in their shells. However, the difference in the number of neutrons results in a difference in the atomic mass of each isotope, which affects its physical properties, such as density and boiling point.

In conclusion, the stable isotopes of selenium have the same atomic structure in terms of protons, electrons, and electron arrangements, but differ in the number of neutrons and thus the atomic mass.

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Answer:

dont know sorry

Explanation:

i dont get it

Answer: C - The iron becomes harder and stronger

Explanation:

The pure iron when mixed with the carbon then steel is formed which is the interstitial alloy of iron. About 0.002%- 2.1% (m/m) of carbon. The carbon atoms being smaller than the iron atom occupy the interstitial spaces or interstices in between the iron atoms. Thus these carbon atoms introduce imperfections in the iron crystal layer. The iron crystal layers become harder and they slide past one another and the iron becomes harder.

Answer:

A titanium ion

The total capacitance of 0.0050 F connected in series is 5.0 × 10⁻⁶ F or 5.0 µF.

When capacitors are connected in series, their total capacitance is less than the smallest capacitance value. This is due to the fact that the effective distance between the capacitor plates increases as more capacitors are added. As a result, the total capacitance of 0.0050 F connected in series can be determined using the following formula:

1/Ceq = 1/C1 + 1/C2 + 1/C3 + ...

where C1, C2, C3, etc. are the capacitance values of the capacitors connected in series.

To compute the total capacitance, substitute the known values to the formula:

1/Ceq = 1/5.0 × 10⁻³ F

Here's how to solve for Ceq:

1/Ceq = 1/5.0 × 10⁻³ F1/Ceq = 200Ceq = 1/200Ceq = 5.0 × 10⁻⁶ F

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Answer: Soils are formed through the interaction of five major factors: time, climate, parent material, topography and relief, and organisms.

Soil structure affects plant growth in many, often surprising, ways. The most obvious effects are on root growth, which is strongly inhibited by hard soil, and which in turn influences the ability of the root system to extract adequate water and nutrients from the soil.

Explanation:

https://www.publish.csiro.au/sr/pdf/SR9910717

This is where I gather some info.  

Answer:

Electronegativities generally decrease from top to bottom within a group due to the larger atomic size.

Of the main group elements, fluorine has the highest electronegativity (EN= 4.0) and cesium the lowest (EN=0.79).

Explanation:

Sulfur has the largest electronegative element. Therefore, option C is correct.

Electronegativity is a measure of an atom's ability to attract electrons toward itself in a covalent bond, and it generally increases as you move across a period from left to right in the periodic table.

The type of bond that exists between atoms will depend on the electronegativity of the system.

Out of the given elements, S (sulfur) has the largest electronegativity. Sulfur has an electronegativity value of 2.58 on the Pauling scale, while Na (sodium) has an electronegativity value of 0.93, Mg (magnesium) has an electronegativity value of 1.31, and P (phosphorus) has an electronegativity value of 2.19. Therefore, option C is correct.

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At the moment the ball hits the ground, its kinetic energy is greatest and its potential energy is zero.

The samples that  has the most moles of the compound is option B which is 75.0g

To determine which sample has the most moles of the compound, we need to calculate the number of moles of each compound using its molar mass.

a) Fe2O3:

Molar mass of Fe2O3 = 2(55.85 g/mol of Fe) + 3(16.00 g/mol of O) = 159.70 g/mol

Number of moles of Fe2O3 = 163.0 g / 159.70 g/mol = 1.02 mol

b) CaS:

Molar mass of CaS = 40.08 g/mol of Ca + 32.06 g/mol of S = 72.14 g/mol

Number of moles of CaS = 75.0 g / 72.14 g/mol = 1.04 mol

Therefore, sample b) (75.0 g of CaS) has the most moles of the compound, with 1.04 moles. Sample a) (163.0 g of Fe2O3) has 1.02 moles and sample c) (150.0 g of BaO) has 0.98 moles.

So, the correct answer is b.

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Answer:

7.53*10²³ molecules of oxygen will you need.

Explanation:

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number applies to any substance.

You can then apply the following rule of three: if by definition of Avogadro's Number 1 mole of oxygen gas contains 6.023*10²³ molecules, 1.25 moles contains how many molecules?

\(amount of molecules=\frac{1.25 moles*6.023*10^{23}molecules }{1 mole}\)

amount of molecules= 7.53*10²³

7.53*10²³ molecules of oxygen will you need.

Answer:

if i consider this reaction

Fe2O3+ 3CO---》2Fe+ 3CO2

so let's calculate first moles of Fe2O3 i.e. = 256/159.69= 1.6 moles

So the one moles of Fe2O3 is forming three moles of CO2

hence 1.6 moles will form 4.8 moles of CO2

one mole of CO2 is 44 g so 4.8 moles of Co2 is 44×4.8= 211.2 g

so the conclusion is 211.2 g of CO2 can be produced from 256 g Fe2O3!!

i d k it's right or wrong but i tried my best :)

Answer:

ammonium carbonate option e

Potassium hydroxide will have the greatest total ion concentration at 25°C. The correct option is (C)

The total ion concentration is the sum of the molar concentration of all the ions in a solution. A solution of a compound will produce ions when dissolved in water, and the sum of the molar concentration of all the ions is known as the total ion concentration.

Potassium hydroxide (KOH) is a strong base that fully dissociates in water to produce potassium ions (K+) and hydroxide ions (OH-).So, if we add 1.0 mole of KOH to 1.0 L of water, we will obtain a 1.0 molar solution of KOH in which the molar concentration of K+ and OH- will both be 1.0 M.

On the other hand, ammonium carbonate, calcium phosphate, potassium chloride, and iron (II) nitrate will produce fewer ions in solution since they do not fully dissociate, so their total ion concentration will be lower.

Hence, we can say that, when 1.0 mole of the following compounds is added to 1.0 L of water, potassium hydroxide will have the greatest total ion concentration at 25°C.

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Given that the volume and molarity of barium acetate are 38.2 ml and 5.0 M, respectively. We need to find the theoretical mass in grams of the precipitate. Let's first write the balanced chemical equation for the reaction taking place: Rubidium Carbonate + Barium Acetate → Barium Carbonate + Rubidium AcetateRb2CO3(aq) + Ba(C2H3O2)2(aq) → BaCO3(s) + 2 RbC2H3O2(aq).

We can see that 1 mole of barium acetate reacts with 1 mole of barium carbonate. Hence, the molar ratio of barium acetate and barium carbonate is 1:1.Using the molarity and volume of barium acetate, we can find the moles of barium acetate as: Moles of barium acetate = Molarity × Volume in litres= 5.0 mol/L × (38.2/1000) L= 0.191 moles. Now, from the balanced chemical equation, we can see that 1 mole of barium carbonate is formed from 1 mole of barium acetate.

Therefore, the number of moles of barium carbonate formed will also be 0.191 moles. Now, let's calculate the mass of barium carbonate using its molar mass. Molar mass of BaCO3= (1 × atomic mass of Ba) + (1 × atomic mass of C) + (3 × atomic mass of O)= (1 × 137.33 g/mol) + (1 × 12.01 g/mol) + (3 × 16.00 g/mol)= 197.33 g/mol. Theoretical mass of BaCO3= Number of moles of BaCO3 × Molar mass of BaCO3= 0.191 mol × 197.33 g/mol= 37.7 g. Therefore, the theoretical mass of the precipitate is 37.7 g (approx) when only the volume and molarity of the barium acetate are taken into account. Note: In order to find the limiting reagent and the actual mass of the precipitate formed, we need to consider the volume and molarity of both the reactants.

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Answer:

avg is 85.4678 atomic mass unit

The sample of helium gas must be cooled to approximately -220°C to reduce its volume from 5.9 L to 0.2 L at constant pressure.

According to the ideal gas law, the relationship between the volume (V), temperature (T), and pressure (P) of a gas can be expressed as PV = nRT, where n is the number of moles of the gas and R is the ideal gas constant. In this case, the pressure is constant, so we can simplify the equation to V/T = constant.

To find the final temperature required to reduce the volume from 5.9 L to 0.2 L, we can set up the following ratio:

(V1 / T1) = (V2 / T2)

Where V1 is the initial volume (5.9 L), T1 is the initial temperature (119°C + 273.15 = 392.15 K), V2 is the final volume (0.2 L), and T2 is the final temperature that we need to find.

Rearranging the equation, we have:

T2 = (V2 / V1) * T1

= (0.2 L / 5.9 L) * 392.15 K

≈ 13.28 K

Converting 13.28 K back to Celsius, we get:

T2 ≈ -259.87°C

Therefore, the sample of helium gas must be cooled to approximately -220°C (or -259.87°C) to reduce its volume from 5.9 L to 0.2 L at constant pressure.

The question should be:

To what temperature must a sample of helium gas be cooled from 119°C to reduce its volume from 5.9 L to 0.2 L at constant pressure?

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Answer:

its 210

Explanation:

Just add all atomic mass used in the formula together: 2*(14+16*3)+88= 2*62+88=124+88=210

Hope this was helpful

The relative formula mass of strontium nitrate Sr(NO₃)₂ is 210

The relative atomic masses of N, O and Sr are 14,16 and 88 respectively.

In calculating the relative atomic mass of an element with isotopes, the relative mass and proportion of each is taken into account. Adding the atomic masses together gives the relative formula mass of a compound

So, relative atomic mass of Sr(NO₃)₂ is calculated as

88+ 2(14+16×3) = 210

The atomic mass constant (symbol: mu) is defined as being 1/12 th of the mass of a carbon-12 atom. Since both quantities in the ratio are masses, the resulting value is dimensionless; hence the value is said to be relative atomic mass.

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Answer:

C I believe not quite sure tho

In heating and melting curves, the name of the heat associated with the solid-liquid phase is Heat of fusion.

What is the Heat of fusion ?

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5) B

6) C

7) B newland, law of octaves

8) A)