what mass (in grams) of sodium bicarbonate is needed to make a 2.2 liters of a 0.45 m solution?

The electron configuration of a potassium atom at ground state is 1s²2s²2p⁶3s²3p⁶4s¹. Therefore, option D is correct.

The electron configuration of an element can be explained as electrons being occupied in different energy levels of an atom of a specific element. In the electron configuration, the electrons are usually written as a superscript of atomic subshells. For example, the electron configuration of Helium can be represented as 1s²2s².

The sequence of completely filled subshells similar to neighboring the electronic configuration of a noble gas is represented by square brackets. The principal quantum number (n) will be used to denote the maximum number of electrons in an electron shell.

The total number of electrons occupied in the given electronic configuration  1s²2s²2p⁶3s²3p⁶4s¹  is 19. The atomic number of potassium is 19 therefore it is the configuration of potassium.

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The simplest whole-number ratio of the various atoms in a compound is represented by an empirical formula.

empirical method a chemical formula, rather than listing the total number of atoms in a molecule, shows the most basic ratio of the components in a compound.

The precise number of various atom types present in a compound's molecule is indicated by the molecular formula. The empirical formula for acetylene is CH. The empirical formula for acetylene is C2H2.

Sample mass equals 0.7789 CO2 mass generated = 1.179

Produced mass of to = 0.3179

C mass in the sample equals \(12 x 1.17 44, or 0.3199.\)

Its mass in the sample is equal to \(2 x 0.317 18 = 0.0359\)

The sample's mass of is given by \(0.778-(0.319+0.035) = 0.424 0.319\).

Divide by 12 H 0.035 0.424 mass their molar and \(0.319 0.035 \s0.424 16 \s0.027 \s0.035 \s0.027\)

by the smallest number

\(0.027 \s0.027 \s0.035 \s0.027 \s0.027 0.027 \s1.3\)

To express the number 3 4 3 in whole numbers, multiply by 3.

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Answer: Convex mirror is curved in the outward direction and concave mirror in the inward direction.

Explanation:

1. Car rear view mirror: It is a convex mirror which gives the indication of large field of view and it allows the driver to view the traffic behind the car.

2. Security: The reflective bulge surfaces of the convex mirrors reflect the light outwards and provides an expanded field of view of the entire view of shops and other places useful for security.

3. Street light reflectors: They use convex mirrors because they are able to spread the light over the wider area.

4. Shaving facial hair: Concave mirror is used in shaving facial hair. It gives a bigger view of face when it is at the position of pole and focal point of the mirror.

5. Car light: It uses concave mirror because of the converging power it can focus more light rays at a particular point.

The best reducing agent at 25°C can be determined by the half-reaction with the lowest reduction potential (most negative Ered value).

The half-reaction that has the lowest reduction potential is the one that is the best reducing agent. Let us use the given reduction potentials to determine which of the following is the best reducing agent at 25°C. Half Reaction Ered (at 25°C) Cl2(g) + 2e- → 2Cl-(aq)   +1.36VAl3+(aq) + 3e- → Al(s)  -1.66VThe half-reaction with the lowest reduction potential is the Al3+(aq) + 3e- → Al(s) with an Ered value of -1.66 V.Therefore, Al3+ is the best reducing agent at 25°C.

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The value of the resistor R that will produce a force of 9.00×10⁻⁵ N between the two parallel wires separated by 5.0 mm and each having a length of 10 cm is approximately 1.8 Ω.

To calculate the value of the resistor R, we can use the formula for the magnetic force between two parallel wires:

\[ F = \frac{{\mu_0 \cdot I_1 \cdot I_2 \cdot \ell}}{{2 \pi \cdot d}} \]

where F is the force, μ₀ is the permeability of free space, I₁ and I₂ are the currents in the wires, ℓ is the length of the wires, and d is the separation between the wires.

In this case, the force F is given as 9.00×10⁻⁵ N, the length of each wire ℓ is 10 cm (or 0.10 m), and the separation between the wires d is 5.0 mm (or 0.005 m).

By rearranging the formula, we can solve for R:

\[ R = \frac{{2 \pi \cdot d \cdot F}}{{\mu_0 \cdot \ell}} \]

Substituting the given values into the equation, we get:

\[ R = \frac{{2 \cdot 3.1416 \cdot 0.005 \cdot 9.00×10⁻⁵}}{{4\pi × 10^{-7} \cdot 0.10}} \approx 1.8 \, \Omega \]

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Answer:

Under regional metamorphism, metamorphic rocks are formed as a result of transformation of large areas of previously existing rocks under the influence of a large amount of heat and pressure which are created by tectonic forces.

Explanation:

Metamorphism is the phenomenon in the formation of metamorphic rocks whereby rocks are changed by heat and pressure. Now, during this process called metamorphism, rocks are bound to change either physically and chemically into a new rock. Now, there are two types of metamorphism namely;

Contact metamorphism and regional metamorphism.

We are concerned with regional metamorphism and it is defined as metamorphic rocks formed as a result of transformation of large areas of previously existing rocks under the influence of a large amount of heat and pressure which are created by tectonic forces.

Answer:

I hope this helps :D

Explanation:

Newton's first law expresses that each object  will stay very still or in uniform movement in an orderly fashion except if constrained to change its state by the activity of an outside power. ... The third law expresses that for each activity (power) in nature there is an equivalent and inverse response.

Based on the information provided, the correct answer for the compound(s) that have exactly two chiral centers is option e. I and IV. Remember that chiral centers are carbon atoms that have four different groups attached to them, making the molecule non-superimposable on its mirror image. In this case, both compounds I and IV meet the criteria of having exactly two chiral centers each.

To answer your question, I would need to provide a brief explanation of what chiral centers are. Chiral centers are carbon atoms in a molecule that have four different groups attached to them. This makes them asymmetric and able to rotate polarized light in either a clockwise or counterclockwise direction.
Now, to determine which of the given options have exactly two chiral centers, we would need to examine each option and count the number of chiral centers.
Option I has one chiral center, so it is not the correct answer. Option II is not given, so we can ignore it. Option III has three chiral centers, so it is also not the correct answer. Option IV has two chiral centers, which matches the requirement of the question.
Therefore, the correct answer is e. I and IV, with IV being the option that has exactly two chiral centers within it.

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The primary reason that large numbers of people left Ireland in the 1840s and 1850s was MASS STARVATION.

Great Famine or Great Hunger was a period in Ireland where mass starvation, diseases, and emigration occurred between 1845 to 1852.

The Great Famine was caused by Phytophthora infestans, a disease that infests in potatoes. Though the potato infestation spread throughout Europe, it greatly affected Ireland, where 1/3 of its population was dependent on the potato crop as their primary source of food.

The loss of their primary source of food led to mass starvation, sickness, and eventual death. Others opted to leave Ireland and seek shelter and food in other countries to survive.

Answer:

The valence shell electron pair repulsion (VSEPR) theory is a model used to predict 3-D molecular geometry based on the number of valence shell electron bond pairs among the atoms in a molecule or ion.

The additional factors such as system efficiency and safety margins need to be considered when determining the actual amount of hydrogen required for a space flight.

To determine the exact amount of hydrogen needed for a space flight, we can use the balanced equation for the reaction between hydrogen and oxygen, which is:

2H2 + O2 → 2H2O

Based on this equation, we can see that two moles of hydrogen react with one mole of oxygen to produce two moles of water. Therefore, if we know the quantity of oxygen available, we can calculate the required amount of hydrogen using stoichiometry.

Let's say we have 10 moles of oxygen available. Since the molar ratio between oxygen and hydrogen is 1:2, we would need twice the number of moles of hydrogen. Therefore, we would require 20 moles of hydrogen.

This calculation is supported by the balanced equation, which shows the exact stoichiometric ratio between hydrogen and oxygen. By using the equation and applying stoichiometry, we can determine the precise amount of hydrogen needed for the reaction.

It's important to note that this calculation assumes ideal conditions and a complete reaction with no side reactions or losses.

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Answer:

0.861111... g/cm³

Explanation:

density= mass/volume

Answer:

A.There is no effect on the forward and reverse reactions. For an equilibrium reaction, the forward and reverse rates are always equal.

B. Both the forward and reverse reactions speed up by the same amount.

C. The forward reaction speeds up immediately. As more product is made, the reverse reaction starts to speed up as the forward reaction starts to slow down until they are equal.

D. The forward reaction slows down initially. As the reaction proceeds, the reverse reaction slows down to meet the new forward reaction.

E. The forward reaction speeds up. Eventually, production of the product speeds up the reverse reaction rate to match the new forward rate.

F. It is impossible to say without more specific information.

Explanation:

The Fischer projections of the four aldotetroses, D- glucose, and L‑glucose are shown in the attached figures below.

In chemistry, the Fischer projection can be described as a two-dimensional representation of a 3-D organic molecule by projection. Fischer projections were proposed for carbohydrates and used by chemists, particularly in organic chemistry and biochemistry.

The main aim of Fischer projections is to show the chirality of a molecule and to differentiate between a pair of enantiomers. Some notable uses involve drawing sugars and depicting isomers.

All chemical bonds are represented as horizontal lines or vertical lines. The carbon chain is represented vertically and represented by the center of crossing lines. The orientation of the carbon chain is represented in such a way that the first carbon C₁ is at the top.

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If you have one molecule of triglycerides and you need to form glucose, you can do it indirectly through glycerol and dihydroxyacetone phosphate.

To form glucose from triglycerides, the molecule would need to undergo a process called gluconeogenesis. Gluconeogenesis is the synthesis of glucose from non-carbohydrate precursors, such as certain amino acids, lactate, and glycerol.

In the case of triglycerides, the molecule can be broken down into glycerol and fatty acids. Glycerol, which is a three-carbon molecule, can enter the gluconeogenesis pathway and be converted into dihydroxyacetone phosphate (DHAP), a key intermediate in glucose synthesis. DHAP can then be converted into glucose 6-phosphate (G6P), which is an important step in glucose metabolism.

Therefore, the correct option is E) Glycerol and Dihydroxyacetone phosphate. By utilizing these intermediates, the body can indirectly convert the triglyceride molecule into glucose through gluconeogenesis. It's important to note that the fatty acids derived from triglycerides cannot be directly converted into glucose but can be used as an energy source through processes like beta-oxidation.

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Sodium Bisulfite converts Bromine (br2) to Bromide (br-). Sodium Bisulfite is a reducing agent.

In chemistry, a reducing agent is a chemical species that "donates" an electron to an electron acceptor. Examples of substances that are normally reducing agents include earth metals, formic acid, oxalic acid, and sulfite compounds. Reducing and oxidizing agents are responsible for corrosion, or "decomposition of metals by electrochemical activity." Corrosion requires an anode and a cathode.

Strong reducing agents are electropositive elements that can readily donate electrons in chemical reactions. Sodium, hydrogen and lithium are examples of strong oxidants. Weak reducing agents react less violently than strong reducing agents, but can participate in reactions that produce heat and gaseous products that pressurize the closed vessel and can participate in further reactions.

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Hydrogen bonds exist in the water molecule below.

Only molecules in which hydrogen is covalently bound to either fluorine, oxygen, or nitrogen experience hydrogen bonding. These three elements are sufficiently electronegative that they remove the majority of the electron density from the hydrogen atom's covalent link, leaving the latter atom with an extremely low electron density.

A hydrogen atom that is connected to an electronegative atom moves toward another electronegative atom nearby to form hydrogen bonds, which are potent intermolecular forces. The hydrogen-bond strength will rise as the hydrogen bond acceptor's electronegativity increases.

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Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

From the question we have

force = 15 × 5

We have the final answer as

Hope this helps you

The statement it reacts with an acid is an observation of a chemical property of the substance.

A chemical property is a characteristic of a substance that are observed in a chemical reaction. Some major chemical properties include flammability, toxicity, heat of combustion, pH value, rate of radioactive decay and chemical stability.

Properties of acids:

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The true statement about the model is that the model shows how the various atoms are connected in the molecule.

A molecular model is a representation of a molecule. We know that the molecular model shows the extent to which the atoms are bonded in the compound. The model gives us an idea of the intricate atom to atom arrangement that exists in the molecule that is under study.

Now we know that the atoms that are in the models must be shown by the use of different colors. This enables us to be able to effectively and properly distinguish between the atoms of the compound as shown in the model.

The true statement about the model is that the model shows how the various atoms are connected in the molecule.

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Answer:

Hypothesis

Explanation:

A hypothesis is a statement that proposes an explanation to an observed phenomenon that can be verified by setting up a scientific test in order for the hypothesis to become classified as correct and verified when the test data supports the hypothesis or when the data and the hypothesis are not in agreement, another hypothesis may need to be developed.

Answer:

hypothesis

got it right edg2021

The concentration of the solution, represented as mole fraction, is approximately 0.130.

To calculate the concentration of the solution in mole fraction, we need to determine the number of moles of solute (Co(CH3COO)2) and the number of moles of the solvent (H2O).

First, let's calculate the number of moles of Co(CH3COO)2 using its molar mass. The molar mass of Co(CH3COO)2 can be calculated as follows:

Molar mass of Co = 58.93 g/mol (from periodic table)

Molar mass of CH3COO = 59.05 g/mol (from periodic table)

Total molar mass of Co(CH3COO)2 = (58.93 g/mol * 1) + (59.05 g/mol * 2) Total molar mass of Co(CH3COO) = 176.03 g/mol

Next, we calculate the number of moles of Co(CH3COO)2 by dividing the given mass by its molar mass:

Number of moles of Co(CH3COO)2 = 6.4 g / 176.03 g/mol

Number of moles of Co(CH3COO)2 = 0.0364 mol

Now, let's calculate the number of moles of water (H2O) using its molar mass:

Molar mass of H2O = 18.02 g/mol (from periodic table)

Number of moles of H2O = 44.66 mL * (1 L/1000 mL) * (1 mol/18.02 g)

Number of moles of H2O = 0.00247 mol

Finally, we can calculate the mole fraction of the solution by dividing the moles of the solute by the total moles of the solution:

Mole fraction of Co(CH3COO)2 = 0.0364 mol / (0.0364 mol + 0.00247 mol)

Mole fraction of Co(CH3COO)2 = 0.130

The concentration of the solution, expressed as mole fraction, is approximately 0.130.

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Answer:The mass of oxygen gas sample collected over water is 0.544 g.

The given parameters;

temperature of the oxygen gas, t = 25 °C

total pressure of the gas, P = 644 torr

volume of the gas, V = 500 mL

vapor pressure = 23.8 torr

molar mass of oxygen gas = 32 g/mol

The number of moles of the gas collected is calculated by using ideal gas equation as follows;

PV = nRT

where;

R is the ideal gas constant = 62.36 L.torr/mol.K

P is the pressure of the gas = 644 torr - 23.8 torr = 620.2 torr

T is the temperature of the gas = 25 + 273 = 298 K

V is the volume of the gas = 500 mL = 0.5 L

The number of moles of the  gas is calculated as follows;

The mass of oxygen gas collected is calculated as follows;

m = 0.017 (32 g/mol)

m = 0.544 g

Thus, the mass of oxygen gas sample collected over water is 0.544 g.

Explanation:

The partial pressure of oxygen is; 760.0 torr - 23.8  torr = 736.2 torr.

We know that in a mixture of gases, the pressure that is exerted by each gas is called the partial pressure of the mixture.

In this case, we have the total pressure of the mixture as 760.0 torr and the vapor pressure of water as 23.8 mm Hg or 23.8  torr) at that temperature. Hence, the partial pressure of oxygen is; 760.0 torr - 23.8  torr = 736.2 torr.

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A buffer solution is defined as a solution that resists a change in pH when a small amount of acid or base is added to it. the buffer capacity of the solution will prevent the pH from changing too much.

The buffer solution containing nitrous acid, HNO2, and potassium nitrite, KNO2, will experience the following changes when a small amount of HClO4 is added to it: The HClO4 added to the buffer solution will react with the potassium nitrite, KNO2, to form the salt, KClO4.T

he HNO2 will be converted to nitric acid, HNO3, by the HClO4.The HNO3 formed in the previous step will react with the potassium nitrite, KNO2, to form nitric oxide, NO, and potassium nitrate, KNO3.The net effect of adding HClO4 to the buffer solution containing nitrous acid, HNO2, and potassium nitrite, KNO2, will be to shift the buffer solution to a more acidic pH range.

However, the buffer capacity of the solution will prevent the pH from changing too much.

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Answer: if we lost our core it would be an entire fallout like fallout 76 we would have no way to protect ourselves from the radiation of space except for a select few that actually own astronaut suits tho we would not turn into monsters, sadly :( I wanna be a ghoul

Explanation:

Actually, the diagram showned in the picture gave you some hints.

Moving every one block to the left indicates 10 times the value of the symbol than the previous one.

For instance,

\(1\text{ km}=10^1\text{ hm}=10^2\text{ dam}=10^3\text{ m}\)

Take the first question as example, since "k" is 9 blocks from the left of mu (u),

\(1 \text{ kg}=10^9 \text{ }\mu\text{g}\)

\(\text{So }.000078\text{ kg}=.000078\times10^9 \text{ }\mu\text{g}=7.8\times10^{-5}\times10^9 \text{ }\mu\text{g}=7.8\times 10^4\text{ }\mu\text{g}\)

Similarly,

\(1 \text{ cL}=10^{-2} \text{ L}\)

\(\text{So }34800\text{ cL}=34800\times10^{-2} \text{ L}=3.4800\times10^{4}\times10^{-2} \text{ L}=3.48\times 10^2\text{ L}\)

\(1 \text{ Mm}=10^{3} \text{ km}\)

\(\text{So }.0283\text{ Mm}=.0283\times10^{3} \text{ km}=2.83\times10^{-2}\times10^{3} \text{ km}=2.83\times 10^1\text{ km}\)

Answer:

Lack of oxygen can cripple the oysters' ability to fight off the parasite Perkinsus marinus that causes Dermo and slowly takes over their bodies.

Answer:

C 1.00M

Explanation:

Answer:

Explanation:

NaCl – Sodium chloride

Other names: {{unbulleted list Saltb Table salt

Appearance: Colorless cubic crystals

CaS – Calcium sulfide

Other names: Calcium monosulfide

Hepar calcies Sulfurated lime