calculate the [H3O+] of solutions a and b; calculate the [OH-] solutions c and d.
9. pH = 2.76
10. pH = 3.65
11. pOH = 3.65
12. POH = 6.87​

Answer:

Ok so I seen your comment because I was looking up the answer and couldn’t find it anywhere so I risked to see if I got it wrong and got it right the answer is b on Plato and sorry I don’t know what it said but I do know I clicked on b hope this helps

Explanation:

Answer:

B.

The solution is nonviable because the time cannot be negative.

Explanation:

If it's wrong tell me

Answer: m= 6.2 g Ba

Explanation: Solution:

0.045 moles Ba x 137 g Ba / 1 mole Ba

= 6.2 g Ba

Final answer:

To calculate the mass of barium that participated in a chemical reaction, multiply the number of moles (0.045) by the molar mass of barium (137.327 g/mol) to get the mass in grams, which is 6.1797 grams.

Explanation:

The question seems to contain a typographical error, as '0.045 miles of barium' is not a valid measure for the amount of a chemical substance. The correct measurement should likely be 'moles' rather than 'miles'. To calculate the mass of barium (Ba) that participated in a chemical reaction, you need to use the molar mass of barium.

Firstly, the molar mass of barium is 137.327 g/mol. Therefore, the calculation to find the mass from moles is:

Identify the number of moles given, which is 0.045 moles of barium.

Calculate the mass by multiplying the number of moles by the molar mass of barium (0.045 moles * 137.327 g/mol).

The result gives you the mass of barium in grams.

For example:

Mass of Ba = 0.045 mol * 137.327 g/mol = 6.1797 g

Therefore, the mass of barium that participated in the chemical reaction is 6.1797 grams.

Answer:

A

Explanation:

Final answer:

Diamonds are considered a metamorphic rock because they are formed through intense heat and pressure deep within the Earth's mantle, which transforms carbon into a crystalline structure. Unlike other metamorphic rocks that show foliation, diamonds are non-foliated as they consist of a single mineral.

Explanation:

We consider diamonds a kind of metamorphic rock because they are formed deep within Earth's mantle through a process of intense heat and pressure. This process transforms the carbon atoms into a crystal structure known as a diamond. Metamorphism involves the recrystallization of minerals and can lead to the formation of new minerals, the reorientation of minerals due to pressure, and sometimes the migration of ions within crystal structures due to heat. While most metamorphic rocks are found in mountain belts or ancient mountain belts due to the conditions conducive to metamorphism, diamonds are actually formed at much greater depths and require unique conditions including temperatures around 900 to 1,300 degrees Celsius, and pressures over 45 kilobars.

The formation of metamorphic rocks, including diamonds, is a facet of the rock cycle, and these transformations allow rocks to become stable under new environmental conditions. Unlike most metamorphic rocks that exhibit foliation due to the reorientation of minerals, diamonds do not show foliation as they are a single mineral rock, thus they are considered non-foliated. They are created from a single element, carbon, and although they have a different formation process compared to foliated metamorphic rocks, the principles of temperature and pressure still apply in their creation.

All matter is made up of atoms is the characteristics that John Dalton included in his description.

Explanation:

Answer:

Al(NO3)3 + Ca(OH)2 = Al(OH)3 + Ca(NO3)2.

Explanation:

The balanced equation for the reaction between calcium nitrate and aluminum hydroxide is: Ca(NO3)2 + 2Al(OH)3 → 2Al(NO3)3 + 3Ca(OH)2.

The balanced equation for the reaction between calcium nitrate and aluminum hydroxide is:

Ca(NO3)2 + 2Al(OH)3 → 2Al(NO3)3 + 3Ca(OH)2

In this reaction, calcium nitrate reacts with aluminum hydroxide to produce aluminum nitrate and calcium hydroxide.

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Answer:

Metamorphic rock is classified by texture and composition. The texture of a metamorphic rock can be either foliated and appear layered or banded, or non-foliated and appear uniform in texture without banding. Foliated rocks contain many different kinds of minerals, but non-foliated rocks contain only one main mineral, which contributes to their more uniform appearance.  Igneous rocks are classified according to mode of occurrence, texture, mineralogy, chemical composition, and the geometry of the igneous body.

Explanation:

Answer:

+1

Explanation:

From the question, the following were obtained:

Proton = 3

Neutron = 3

Electron = 2

From the above, we see clearly that the atom has loss 1 electron as the electron is lesser than the proton with 1. So, the atom has a charge of +1

The electrical charge of an atom is determined by subtracting the number of electrons from the number of protons. In this atom with three protons and two electrons, the overall charge is +1.

When considering the electrical charge of an atom, the important components to consider are the protons, which have a positive charge, and the electrons, which have a negative charge. Neutrons do not have a charge, so they do not contribute to the overall charge of the atom. In this case, the atom has three protonsand two electrons. Each proton has a charge of +1, and each electron has a charge of -1. Therefore, the overall charge of this atom is calculated by subtracting the number of electrons from the number of protons: 3 (protons) - 2 (electrons) = +1. So this atom has an overall charge of +1.

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Answer:

V₂ = 630 L

Explanation:

Given data:

Initial volume = 350 L

Initial pressure = 1400 mmHg (1400/760 = 1.8 atm)

Final volume = ?

Final pressure = standard = 1 atm

Solution:

The given problem will be solved through the Boly's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume

Now we will put the values in formula,

P₁V₁ = P₂V₂

1.8 atm × 350 L = 1 atm × V₂

V₂ = 630 atm. L/1 atm

V₂ = 630 L

To find the volume of gas at standard pressure, use Boyle's Law. Given an initial pressure of 1400 mm Hg and volume of 350L, at standard pressure (760 mm Hg) the volume would be 500L.

To determine the gas volume at standard pressure when given a volume at a different pressure, we can use Boyle's Law, which states that the product of pressure and volume is constant for a given amount of gas at a constant temperature (P1V1 = P2V2). Standard pressure (STP) is defined as 1 atm, which is equivalent to 760 mm Hg. The volume of the gas at STP can thus be calculated using the initial conditions:

V2 = (P1 * V1) / P2

Substitute the provided values:

P1 = 1400 mm Hg

V1 = 350 L

P2 = 760 mm Hg (standard pressure)

Now, rearrange the equation to solve for V2:

V2 = (1400 mm Hg * 350 L) / 760 mm Hg = 500 L

Thus, the volume of the gas at standard pressure would be 500 L.

Answer:

D. It will not have a nucleoid.

Explanation:

Cells with a nucleus are eukaryotic cells. This means they will have membrane-bound organelles. The nucleus is an example of a membrane bound organelle that houses the DNA.

A. It will not have nuclear membrane. - this is false, the nucleus is surrounded by the nuclear membrane

B. It will not have a nucleolus - this is false, the nucleolus is a part of the nucleus, usually where ribosomal RNAs are made

C. It will not have ribosomes - this is false, proteins are made in ribosomes and they are present in all cells

D. It will not have a nucleoid - this is true. The nucleoid is a space in the cytoplasm of prokaryotic cells that houses the DNA. It is not membrane bound, and is distinct from the nucleus.

Answer:

top answer is right for sur!

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Explanation:

Answer:

1 Count the atoms of each element in the reactants and the products. 2 use coefficient place them in front of the compound as needed.

Answer:

Below.

Explanation:

1.   Al2(SO4)^3 (aq) + 6LiOH aql)  ----> 3Li2SO4 (aq) + 2Al(OH)^3 (s)

2.  (NH4)2CO3 (aq) + MgCl2 (aq)  ---->  2(NH4)Cl (aq) +  MgCO3 (s).

Chemical equations are represented using correct formulas and physical states, with the aluminum sulfate and lithium hydroxide reaction yielding aluminum hydroxide and lithium sulfate, and the ammonium carbonate and magnesium chloride reaction producing ammonium chloride and magnesium carbonate.

To convert word equations into chemical equations, it is essential to use correct chemical formulas and include the physical states of the compounds. Here are the given reactions converted into chemical equations:

Ensuring the reaction equations are balanced is crucial for accurately representing the conservation of mass in chemical reactions.

Answer:

Oxygen - non polar

Carbon Dioxide - non polar

Explanation:

Oxygen is non polar because it is a covalent bond with equal electronegativity.

Carbon dioxide is also non polar because it has 2 Oxygen atoms which are as I stated above they are equally electronegative.

Oxygen is a nonpolar molecule as it consists of two identical atoms sharing electrons equally. Carbon dioxide is also nonpolar because, despite having polar covalent bonds, its linear shape causes the partial charges to cancel each other out.

The question asks whether each given molecule, oxygen, and carbon dioxide is polar or nonpolar and to explain the reasoning behind the classification. The polarity of a molecule is determined by both the electronegativity of the atoms and the overall molecular geometry. Oxygen (O2) is a homonuclear diatomic molecule, meaning it consists of two identical atoms that share the electrons equally, and as a result, it is a nonpolar molecule.

Carbon dioxide (CO2), on the other hand, is a linear molecule with two polar covalent bonds between carbon and oxygen. However, due to the symmetry of its linear shape, the partial charges on the molecule cancel each other out, making it a nonpolar molecule.

Answer:

2nd and last.

Explanation:

In the first equation,the number of hydrogen atoms is not balanced and in the third,the number of aluminum atoms is not balanced.

Answer:

1. Fe 2 O 3 + 3H 2 2Fe + 3H 2 O

2. CaCO 3 CaO + CO 2

Answer:

The first choice, [tex]-205.7\; \rm kJ[/tex].

Explanation:

Let the three reactions, where the enthalpy change were known, be called (1), (2), and (3).

The goal is to find the enthalpy change of the fourth equation. Assume that this equation can be written as [tex]x \times (1) + y \times (2) + z \times (3)[/tex] for some [tex]x[/tex], [tex]y[/tex], and [tex]z[/tex] (might not be whole numbers or take positive values.) Then, by Hess's Law, the enthalpy change of that reaction would be [tex]x \cdot \Delta H_1 + y \cdot \Delta H_2 + z \cdot \Delta H_3[/tex].

To find these [tex]x[/tex], [tex]y[/tex], and [tex]z[/tex], consider: what combination of reaction (1), (2), and (3) would give the fourth reaction?

Imagine that the coefficients are positive for all the reactants, and negative for all the products.

For example: in (1), [tex]\rm H_2\; (g)[/tex] has a coefficient of [tex]2[/tex]. However, since it is on the the product side of (1), its value should be [tex]-2[/tex]. Also, in (3)

Since there is no [tex]\rm H_2\; (g)[/tex] in the desired equation, the value of [tex]x[/tex], [tex]y[/tex], and [tex]z[/tex] should ensure that [tex]-2x + z = 0[/tex].

Another example: [tex]\rm CH_4\; (g)[/tex] is on the reactant side of the first reaction. Its coefficient in the equation is [tex]1[/tex], so that corresponds to [tex]+1[/tex]. Since [tex]\rm CH_4[/tex] is neither in (2) nor in (3), the value of

In the desired equation, [tex]\rm CH_4\; (g)[/tex] is on the reactant side with a coefficient of [tex]1[/tex]. As a result, the value of [tex]x[/tex], [tex]y[/tex], and [tex]z[/tex] should ensure that [tex]x = 1[/tex].

One such equation can be found for each species in the reactions.

[tex]\displaystyle \begin{cases}x = 1 & \left(\text{For $\mathrm{CH_4\; (g)}$}\right) \\ -x - y= 0 & \left(\text{For $\mathrm{C\; (s)}$}\right) \\ -2\, x + z = 0 & \left(\text{For $\mathrm{H_2\; (g)}$}\right) \\ y = -1 & \left(\text{For $\mathrm{CCl_4\; (g)}$}\right) \\ -2\, y + z= 4 & \left(\text{For $\mathrm{Cl_2\; (g)}$}\right) \\ -2\, z = -4 & \left(\text{For $\mathrm{HCl\; (g)}$}\right)\end{cases}[/tex].

Solve this system of equations for [tex]x[/tex], [tex]y[/tex], and [tex]z[/tex] (this approach works only if at least one solution exists.) In this case,

[tex]\displaystyle \begin{cases}x = 1 \\ y = -1 \\ z = 2\end{cases}[/tex].

Calculate the enthalpy change of the desired reaction:

[tex]\begin{aligned}\Delta H &= x\times \Delta H_1 + y \times \Delta H_2 + z \times \Delta H_3 \\ &= 1 \times 74.6 + (-1) \times 95.7 + 2 \times (-92.3) \\ &= -205.7\; \rm kJ\end{aligned}[/tex].

Answer:

The answer should br C

Explanation:

Answer:

Carbon and oxygen are chemically bonded in it.

Explanation:

The other answer choices do not apply for compounds, but rather for mixtures instead.

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No matter where it was collected, carbon dioxide has a constant composition, making it a pure substance. One carbon atom and two oxygen atoms are always present in each carbon dioxide molecule. Thus, option A is correct.

Two oxygen atoms are covalently bound to one carbon atom to form the chemical molecule known as carbon dioxide (CO2). It exists as a gas in the Earth's atmosphere at standard pressure and temperature.

The production and burning of fossil fuels like coal, oil, and natural gas as well as during wildfires and other natural processes like volcanic eruptions.

Inhaling CO2 is thought to be only mildly harmful. The fundamental health impacts of CO2 are a result of its simple asphyxia nature.

A gas that decreases or replaces the natural oxygen in breathing air is referred to as a simple asphyxia. Mild CO2 exposure symptoms can include headache and sleepiness.

Therefore, Carbon and oxygen are chemically bonded in it.

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Answer: an experiment is an empirical procedure that arbitrates competing models or hypotheses. Researchers also use experimentation to test existing theories or new hypotheses to support or disprove them.

Explanation: I don't know if this helps but if it does let me know.

Final answer:

Scientists perform experiments primarily to test hypotheses, gather data, and validate or disprove their proposed explanations for phenomena. These experiments are essential for the advancement of scientific knowledge and are often peer-reviewed and published if the results are significant.

Explanation:

The main reason scientists perform experiments is to test a hypothesis which is a proposed explanation for a phenomenon, and to answer specific research questions. Experiments are carefully designed to collect data and analyze results objectively. If the results support the hypothesis, further experiments may be conducted to test related hypotheses, or if the results are inconsistent with the hypothesis, it may be discarded for a new alternative hypothesis.

By performing experiments, scientists aim to ensure repeatability and to explore underlying causes for observed phenomena. Experiments are a critical aspect of the scientific method, enabling researchers to extend their knowledge of the natural universe through empirical evidence. The design of an experiment is guided by the goal to make measurements that test the hypothesis, and often involves statistical, mathematical, or graphical analysis of the data collected.

Significant results get published in scientific journals, which serve to communicate the findings and contribute to the body of scientific knowledge. With the advent of open access and electronic journal availability, the dissemination of scientific knowledge has become more accessible.

Answer:

North American X-15

Explanation:

This is the fastest manned aircraft

Answer: SR-71 Blackbird

Explanation: The fastest manned plane is the SR-71 Blackbird. It has traveled at 936 m/s. That is about three times the speed of sound, Mach 3. The SR-71 Blackbird set records both speed and altitude. (brainliest answer pls <3)

Answer:

                      %Copper  =  25.42 %

Explanation:

                    For solving this problem one first write down the half reactions as;

Reduction of Cu²⁺ to Cu⁺¹ by I⁻:

                                2 Cu²⁺  +  4 I⁻   →   2 CuI  +  I₂

Secondly, the titration reaction between Na₂S₂O₃ with I₂ as;

                             2 S₂O₃²⁻  +  I₂   →   S₄O₆²⁻  +  2 I⁻

Now, Calculate Moles of S₂O₃²⁻ as;

                             Moles  =  Molarity × Volume

Putting values,

                             Moles  =  0.1 mol/L × 0.02 L

                             Moles  =  0.002 moles of S₂O₃²⁻

From first two equations we can conclude that,

2 moles of S₂O₃²⁻ liberated I₂ produced by  =  2 moles of Cu²⁺

So,

0.002 moles of S₂O₃²⁻ will liberate I₂ produced by  = X moles of Cu₂⁺

Solving for X,

                       X =  0.002 mol × 2 mol / 2 mol

                       X  =  0.002 mol of Cu²⁺

So, we require 0.002 moles of Cu²⁺ to produce I₂ enough for titrating with 0.1 M (20.00 mL) sodium thiosulphate solution.

Now, Calculate mass of Copper as,

                       Mass  =  Moles  ×  A.Mass

                       Mass  =  0.002 mol × 63.55 g/mol

                       Mass  =  0.1271 g of Copper

Lastly, calculate % copper as,

                       %Copper  =  0.1271 g / 0.500 g × 100

                       %Copper  =  25.42 %

Final answer:

To calculate the percent copper in a sample using iodometric titration, the amount of sodium thiosulphate used in the titration reveals the moles of copper present. The mass of copper is then calculated, allowing us to find that the sample is 25.42% copper.

Explanation:

To determine the percent copper in the sample using iodometric titration, we first need to understand the chemistry involved. The reaction between Copper (II) and iodide produces iodine, which is then titrated with sodium thiosulphate. The formula for calculating the percent copper is based on the stoichiometry of these reactions.

Given that 20.00 [tex]cm^3[/tex] of 0.1 M sodium thiosulphate is required, we can calculate the moles of sodium thiosulphate reacted: Moles of sodium thiosulphate = 20.00 [tex]cm^3[/tex] × 0.1 mol/L = 0.0020 mol.

Sodium thiosulphate reacts with iodine in a 1:1 molar ratio, meaning 0.0020 mol of iodine was produced. The stoichiometry between copper (II) and iodine is also 1:1, so 0.0020 mol of Copper (II) was initially present. The molar mass of Copper (II) is 63.546 g/mol, hence the mass of copper in the sample is 0.0020 mol × 63.546 g/mol = 0.1271 g.

To find the percent copper, we then use the formula: Percent Copper = (Mass of Copper in the Sample / Total Mass of the Sample) × 100 = (0.1271 g / 0.500 g) × 100 = 25.42%.

Answer:

NaI

Explanation:

The formula for sodium iodide is NaI

It is a compound (ionic compound) formed by the chemical reaction between sodium, Na and iodine.

The sodium is a metal in group 1 with atomic number 11 and mass number 23 ,it has one valence electron which it gives out to form a cation of +1 charge and the iodine is in group 7(halogen family) with atomic number 57 and mass number 23 and it has 7 valence electrons which allows it attract 1 electron to form an anion(iodide) of charge -1.

The reaction of sodium ion with iodide ion form the sodium iodide where sodium releases its one valence electron and iodine receives it which makes it balance that is they react in ratio 1:1 and thus have a chemical formula of NaI.

NaI has atomic mass of 150g/mole that is 127 + 23 = 150

Where

Na=23g/mol, I = 127g/mol

NaI is used mainly as nutritional supplement

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C. pressure is directly proportional to the absolute temperature

Explanation:

Answer:

C. Pressure is directly proportional to the absolute temperature.

Explanation:

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Answer:

The total pressure of a mixture of gases is the sum of the partial pressures of the gases that make it up is described by Dalton's Law. The correct answer is OB) Dalton's law.

Dalton's law, also known as the law of partial pressures, states that the total pressure exerted by a mixture of non-reacting gases is equal to the sum of the partial pressures of the individual gases. In other words, each gas in a mixture contributes to the total pressure independently based on its own partial pressure. This law is applicable when the gases do not chemically react with each other and occupy the same volume.

Boyle's law (OA) describes the relationship between pressure and volume of a gas at constant temperature.

Charles's law (OC) relates the volume and temperature of a gas at constant pressure.

The combined gas law (OD) combines Boyle's, Charles's, and Gay-Lussac's laws to describe the relationship between pressure, volume, and temperature of a gas when all three variables change simultaneously.

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1.08 atm is the pressure for a certain tire in atmosphere.

Explanation:

One kilo pascal (1 kPa) corresponds to 1000 pascal. Another common unit used for pressure is atmosphere (symbolised as ‘atm’). 1 atm refers the standard atmospheric pressures and corresponds to 760 mm Hg and 101.3 kPa. Atmospheric pressures are commonly referred as square inches (psi)/ pounds.

  [tex]1 \mathrm{atm}=101.3 \mathrm{kPa}=101,325 \mathrm{Pa}=760 \mathrm{mm} \mathrm{Hg}=760 \text { torr }=14.7 \mathrm{lb} / \mathrm{in}^{2}(\mathrm{psi})[/tex]

Given:

The air pressure for a certain tire = 109 kPa

We need to find pressure in atmospheres

So, we know,

1 atm = 101.3 kPa

Hence,

[tex]\frac{109 \mathrm{kPa}}{1} \times \frac{1 \mathrm{atm}}{101.3 \mathrm{kPa}}=1.076=1.08 \mathrm{atm}[/tex]

1.08 atm is the pressure for a certain tire in atmosphere.

The pressure in atmosphere is = 1.08 atmosphere.

The atmospheric pressure can be measured using a barometer in units of measurement called atmospheres or bars.

To convert 109 kPa pressure to atmosphere,

101.325 kPa = 1 atm

109 kPa = X

Cross multiply to solve for x,

[tex]x = \frac{1 \times 109}{101.325} [/tex]

X = 1.075

X = 1.08 atmosphere.

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the atmosphere,the terrestrial biosphere, the oceans and the sediments

Answer: C

Explanation: The answer is c because of the H2+CI1--> 2HCI

Answer: 33.3 L

Explanation: solution attached:

Convert mass of H2O to moles

Convert 134°C to Kelvin

134°C + 273 = 407 K

Derive the ideal gas equation for V:

V = nRT /P

Substitute the values.

Answer:

1. Flower

- contain the sexual organs of the plant

- attract insect for pollination

- produce fruit carries the seed during fertilization.

2. Leaf

- capture sunlight for photosynthesis

- responsible to make food

- evaporate water molecules

- movement of oxygen and carbon dioxide in and out to plant

3. Stem

- transport water and nutrients from root to leaves.

- support leaves and branches

- in some plants are photosynthetic

4. Root

-provide support by anchoring the plant

- absorb water and nutrients for growth

- store sugars and carbohydrates to perform other functions

Answer:

The number of molecules = 2.6408 molecules

Explanation:

To determine the number of molecules in water, we need to determine how many moles of water we have

Water has a molar mass of 18.015g/mol, this means that one mole of water molecules has a mass of 18.015g

To find the number of molecules,

7.9g * 1 mole H2O/ 18.015g

= 0.4385mole of H2O

Using avogadro number,

0.4385 H2O * 6.022* 10^23molecules/ 1 mole of H2O

That's 0.4385 H2O multipled by 6.022*10^ 23 molecules divided by 1 mole of H2O

Which gives == 2.6408 molecules