The density of water is 1 g/cm3(1 gram per cubic centimeter); using this fact as a reference & Table c , how would you determine if an object sinks or float

Answer:

10

Explanation:

the atomic number shows how many protons and electrons there are

To calculate the hydronium ion concentration ([H3O+]) of a polyprotic acid solution, we need to consider the acid dissociation constants and the concentrations of the acid species.

H3C6H5O7, also known as citric acid, is a polyprotic acid with three dissociable protons. The dissociation reactions and their corresponding acid dissociation constants (Ka values) are as follows:

H₃C₆H₅O₇ ⇌ H⁺ + H₂C₆H₅O₇⁻ (Kₐ₁)

H₂C₆H₅O₇⁻ ⇌ H⁺ + HC₆H₅O₇²⁻ (Kₐ₂)

HC₆H₅O₇²⁻ ⇌ H⁺ + C₆H₅O₇³⁻ (Kₐ₃)

Given that the concentration of H₃C₆H₅O₇ is 0.125 M, we can assume that the initial concentrations of HC₆H₅O₇²⁻, HC₆H₅O₇²⁻, and C₆H₅O₇³⁻ are negligible compared to the concentration of the undissociated acid.

In the case of citric acid, the first dissociation (Kₐ₁) is the dominant one. Therefore, we can simplify the calculation by assuming that all of the H₃C₆H₅O₇ will dissociate into H⁺ and H₂C₆H₅O₇⁻. This means that the concentration of H⁺ ions is equal to the concentration of H₃C₆H₅O₇.

Therefore, the [H₃O⁺] concentration of the 0.125 M H₃C₆H₅O₇ solution is 0.125 M.

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Answer:

when it comes to adding or subtracting numbers, his final answer should have the same number of decimal places as the least precise value.

For example if you add 2 numbers; 10.443 + 3.5 , 10.443 has 3 decimal places and 3.5 has only one decimal place.

Therefore 3.5 is the less precise value.

So when adding these 2 values the final answer should have only one decimal place.

after adding we get 13.943 but it can have upto one decimal place. then the second decimal place is less than 5 so the answer should be rounded off to 13.9.

the answer is the same number of decimal places as the least precise value

Explanation:

I think this is the answer I'm not sure

Answer: the same number of decimal places as the least precise value

Explanation:

Answer:

Okay?.......................

Answer:

Electrons in the gaseous atoms first become excited, and then fall back to lower energy levels, emitting light of a distinctive color in the process. ... An atomic emission spectrum is the pattern of lines formed when light passes through a prism to separate it into the different frequencies of light it contains.

Explanation:

hope this helps u.

The number of the molecules of CO2 that is produced is 1.81 * 10^23 molecules

Stoichiometry is the study of the quantitative relationships between reactants and products in a chemical reaction. It is used to determine the amount of products that can be formed from a given amount of reactants, and vice versa.

If 2 mols of C2H6 produces 4 moles of CO2

0.15 moles of C2H6 will produce 0.15 * 4/2

= 0.3 moles

If 1 molecule contains 6.02 * 10^23 molecules

0.3 moles will contain 0.3 * 6.02 * 10^23 molecules/1 molecule

= 1.81 * 10^23 molecules

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For each half-life, the total amount of the isotope is divided by 2.

Therefore, the amount of parent isotope that remains after:

1 half-life is ½= 0.5

2 half-lives= 2/4= 0.5

3 half-lives= 3/6= 0.5

What is an isotope?

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Answer:

1) Liquid forms drops that are dome-shaped

2) low surface tension

3) low viscosity

4) Liquid is thick and pours very slowly

Explanation:

It makes sense just use the stuff that's already in the table. It usually works.

Exothermic is the process in which energy is released in the form of heat. It is the opposite of endothermic.

From the options provided, the exothermic process is the one that releases heat. Hence, the answer is option (C): the chemical reaction in a "cold pack" often used to treat injuries.

This is because the reaction in a cold pack produces heat. The liquid water condensing from steam is an exothermic process, which releases heat. The melting of ice is an endothermic process that absorbs heat. Sweat evaporating from the skin is an endothermic process that absorbs heat.

Therefore, the correct answer is option (C), the chemical reaction in a "cold pack" often used to treat injuries.

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There is no element that is exclusively found only in the human body. Elements found in the human body are also present in various forms throughout the Earth's crust, atmosphere, and other living organisms. However, there are elements that are essential for human life and play crucial roles in our body's biological processes.

Some key elements found in the human body include oxygen (O), carbon (C), hydrogen (H), and nitrogen (N). These elements make up a large percentage of our body's composition and are the building blocks for molecules like proteins, carbohydrates, and lipids. Other essential elements, such as calcium (Ca), phosphorus (P), potassium (K), sulfur (S), sodium (Na), chlorine (Cl), and magnesium (Mg) also play vital roles in maintaining our health and ensuring proper functioning of our cells.

In summary, while there isn't an element that is solely found in the human body, there are several elements that are crucial for our body's proper functioning and overall health. These elements can be found in various forms and quantities throughout the Earth and other living organisms as well.

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A. Ionic bond , The type of bond holding K+ and I– ions together in solid potassium iodide (KI) is A. Ionic bond.

The type of bond holding K+ and I– ions together in solid potassium iodide (KI) is an ionic bond. Ionic bonds are formed between ions of opposite charges, in this case, the positively charged K+ ion and the negatively charged I– ion. These ions are attracted to each other by electrostatic forces, creating a strong bond that holds them together in a solid lattice structure.

An ionic bond is a type of chemical bond that forms between atoms or ions with opposite charges. In the case of KI, the potassium (K+) ion has a positive charge, while the iodide (I–) ion has a negative charge. These opposite charges attract each other, forming an ionic bond. Ionic bonds are typically very strong, which is why compounds held together by ionic bonds tend to have high melting and boiling points. In solid potassium iodide, the K+ and I– ions are arranged in a lattice structure, with each ion surrounded by oppositely charged ions. This arrangement maximizes the attractive forces between the ions, resulting in a stable solid. In contrast to ionic bonds, hydrogen bonds, covalent bonds, van der Waal’s interactions, and hydrophobic interactions are all different types of chemical bonds or interactions that occur between molecules or atoms, rather than between ions. Therefore, none of these types of bonds or interactions are responsible for holding K+ and I– ions together in solid potassium iodide.

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Answer:

B. Cu + 4HNO3 → Cu(NO3)2 + 2H2O

Explanation:

A redox reaction is one in which oxidation and reduction reactions are occuring simultaneously.

In a redox reaction, an oxidizing agent is reduced ( its oxidation state decreases) whereas a reducing agent is oxidized (it's oxidation state increases).

The nitrogen in the nitrate (v) ion, NO3-, exists in the +5 oxidation state. Therefore it would be acting as an oxidizing agent in any reaction in which it's oxidation state becomes less than +5 after the reaction.

Let us then consider each of the reactions:

A. Reaction 1: in this reaction, the oxidation state of nitrogen remains +5 as what is simply an exchange of radicals in a neutralization reaction.

B. Reaction 2: in this reaction, trioxocarbonate (v) acid oxidizes Copper atom to Copper (ii) ion, while itself it is reduced to Nitrogen (IV) oxide. The oxidation state of nitrogen changes from +5 to +4

C. Reaction 3: in this reaction, what occurs is an exchange of radicals by a displacement reaction. The oxidation state of nitrogen remains the same

D. Reaction 4: in the reaction, what occurs is a neutralization reaction, and the oxidation state of nitrogen remains the same.

Therefore, the correct option is B.

Answer:

the transfer through empty space can be radiation

Explanation:

because when it transfers it turns into radiation

Answer:

3.77 moles of Fe contain 2.27 × 10, 24 as an exponent

Rounding to the nearest cubic yard, the volume of the Pyramid of Memphis is approximately 1,376,886 cubic yards.

To find the volume of the Pyramid of Memphis, we need to use the formula:

Volume = (1/3) x Base Area x Height

where Base Area is the area of the square base, and Height is the height of the pyramid.

The area of the square base is:

Base Area = \((Side Length)^2\)

= \((197 yards)^2\)

= 38,809 square yards

The height of the pyramid is given as 107 yards.

Therefore, the volume of the pyramid is:

Volume = (1/3) x Base Area x Height

= (1/3) x 38,809 x 107

≈ 1,376,886 cubic yards

To find the volume of a three-dimensional object, you need to determine how much space it occupies. The formula for the volume of a three-dimensional object depends on the shape of the object.

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Note- The correct question would be as below

The Pyramid of Memphis, in Tennessee, stands 107 yards tall and has a square base whose side is 197 yards long. What is the volume of the Pyramid of Memphis, to the nearest cubic yard?

Answer:

accurate

Explanation:

Temperature is 258.32°C

Using the ideal gas equation;

PV = nRT        --------------(i)

Where;

P = Pressure of the gas

V = Volume of the gas

n = number of moles of the gas

R = Gas constant = 8.31 J/mol · K

T = Temperature

Given:

mass of H₂ gas = 7.056 grams

Volume of the gas = 85L = 8.5 x 10⁻³m³

Pressure of the gas = 101.3kPa = 101.3 x 10³Pa = 1.013 x 10⁵Pa

Steps:

(i) Using the mass of the gas, calculate the number of moles using the relation:

n = m / M         ----------------- (ii)

Where;

m = mass of H₂ = 7.056g

M = Molar mass of H₂ = 1g/mol

Substitute these values into equation (ii) as follows:

n = 7.056g / (1g/mol)

n = 7.056mol

(ii) Now calculate the temperature of the balloon by substituting the necessary values into equation (i)

(1.013 x 10⁵Pa)(8.5 x 10⁻³m³) = (7.056mol) (8.31 J/mol · K)(T)

T = (1.013 x 10⁵Pa)(8.5 x 10⁻³m³) ÷ (7.056mol) (8.31 J/mol · K)

Solving the above gives

T = 14.68K

Convert this to Celsius

T = 273 - 14.68

T = 258.32°C

Answer:

2 in front of the H and O for number 21

2 in vfront of the Ag as the left aside of the equation

1 in front of everything for 23

1 in front of everything for 24

Explanation:

If we are not using the pH electrode for measurement then it should be submerged in a solution.

Firstly, we know that the pH of a solution is the negative logarithm of the hydrogen ion concentration of the solution. We know that the more the hydrogen ion concentration of the solution, the owner the pH of the solution.

Having said this, It should be recalled that the measurement of the pH is carried out by the use of the pH electrode. When  not being used between measurements, the  ph electrode be submerged in a solution.

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The Correct is Na2CO3 contains both ionic and covalent bonds. The correct answer is (E).

SF6 (or sulfur hexafluoride) is a covalent compound in light of the fact that both sulfur and fluorine are nonmetal components.

There are sure mixtures that contain both ionic and covalent bonds. An ionic bond is a synthetic connection between two molecules, where one particle gives its electron to another iota. Then again, the covalent bond has a superior electron design because of the contribution of two particles sharing electrons.

The mixtures containing both ionic and covalent bonds for the most part contain metal, nonmetal, and hydrogen.

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Answer:

Jason's percent yield can be calculated using the formula:

percent yield = (actual yield / theoretical yield) x 100%

percent yield = (11.7 g / 71.4 g) x 100% = 16.4%

a). The two ionization reactions for oxalic acid are: C₂H₂O₄(aq) ⇌ H+(aq) +  HC₂O₄\(^-^(^a^q^)\) and HC₂O₄\(^-^(^a^q^)\) ⇌ H+(aq) + C2O₄²-(aq).

b).The fractions of each species of oxalic acid change with pH.

The ionization reactions of oxalic acid (C2H2O4) can be written as follows:

In the first ionization reaction, one hydrogen ion (H+) and one hydrogen oxalate ion (HC₂O₄-) are formed from oxalic acid. In the second ionization reaction, one hydrogen ion (H+) and one oxalate ion (C2O₄²-) are formed from the hydrogen oxalate ion.

(b) The fractions of each species of oxalic acid (C₂H₂O₄), hydrogen oxalate ion (HC₂O₄-), and oxalate ion (C2O₄²-) can be plotted as a function of pH. At low pH values, most of the oxalic acid exists in the undissociated form.

As the pH increases, the concentration of hydrogen ions increases, causing the first ionization reaction to occur and leading to the formation of hydrogen oxalate ions. At higher pH values, the second ionization reaction takes place, resulting in the formation of oxalate ions.

The plot would show that as the pH increases, the fraction of oxalic acid decreases, while the fractions of hydrogen oxalate ion and oxalate ion increase. This reflects the shift from the acidic form of oxalic acid to its conjugate base forms as the pH becomes more basic.

Overall, the ionization reactions and the corresponding plot of species fractions provide insights into the behavior of oxalic acid in different pH conditions, illustrating its acidic nature and the transition to its conjugate base forms as the pH increases.

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Answer:

C.) Middle

Explanation:

A.) is incorrect because elements on the bottom of the periodic table can be metals, nonmetals, or metalloids. However, the majority of these elements would be metals.

B.) is incorrect because elements on the right side (aka. the p-block) of the periodic table are mostly nonmetals. This excluding the stair case elements which are metalloids and elements to the left of the stair case which are metals.

C.) is correct because elements located in the middle of the periodic table (aka. the d-block) are always metals. The elements in this section are usually nicknamed the "transition metals". It should be noted that elements on the left side (aka. the s-block) of the periodic table are also metals (excluding hydrogen).

Answer:

1. mega = e

2. centi = d

3. nano = b

4. kilo = a

5. milli = f

6. micro = g

7. giga = c

Explanation:

1. mega = e

2. centi = d

3. nano = b

4. kilo = a

5. milli = f

6. micro = g

7. giga = c

According to a first-order rate law with a rate constant of 0.0058 min1, the reaction requires a concentration of iodide of about 4.83 mM before the color changes after 12 minutes.

The demonstration in the movie shows that larger iodide ion concentrations accelerate the first reaction, hastening the depletion of thiosulfate. Because of this, the reaction's end-signaling color shift happens faster.

rate = k[I-]

[I-] = rate / k

Plugging in the given rate (0.028 mM/12 min), we get:

[I-] = (0.028 mM/12 min) / k

[I-] = (0.028 mM/12 min) / (0.0058 min⁻¹)

[I-] ≈ 4.83 mM

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The solubility of a sample will decrease when the size of the sample increases.

When the Size of sample is bigger, it means there is more particles that make up that sample so the amount of solvent to dissolve the sample will also be in the greater amount. Thus, when the sample size increases the solubility decrease. We can also say that size of sample and solubility are inversely proportional to each other.

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

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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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