A student proposes the following Lewis structure for the nitronium (NO_2^+) ion Assign a formal charge to each atom in the student's Lewis structure.

Answer:

Stirring brings fresh portions of the solvent in contact with the solute, therefore allows the solute to dissolve faster.

During the oxidative phosphorylation of cellular respiration, hydrogen can be considered as a reducing agent because it loses electrons while molecular oxygen is an oxidizing agent because it accepts electrons.

Reducing and oxidizing agents are different molecules that accept and donate electrons in chemical redox reactions such as oxygen which accept and hydrogen which donates.

Therefore, with this data, we can see that reducing and oxidizing agents are related and they work together to move electrons in different redox reactions such as occur during cellular respiration.

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The best alternative to using latex-free gloves when handling ready-to-eat food is using nitrile gloves.

Nitrile gloves are a suitable alternative to latex gloves for handling ready-to-eat food. Nitrile is a synthetic material that offers similar benefits to latex in terms of flexibility and dexterity. Nitrile gloves are also resistant to punctures and chemicals, providing a protective barrier against potential contamination. Moreover, nitrile gloves are considered hypoallergenic and do not cause the same allergic reactions as latex gloves, making them safe for individuals with latex allergies or sensitivities.

When handling ready-to-eat food, it is crucial to maintain hygiene and prevent cross-contamination. Wearing gloves is an important practice to minimize the risk of transmitting harmful microorganisms. By choosing nitrile gloves as an alternative to latex gloves, one ensures the safety of individuals who may be allergic to latex while maintaining the necessary level of protection when handling food. Nitrile gloves are widely available and commonly used in food handling settings, making them a suitable and reliable choice for ensuring food safety and hygiene.

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coal gas, gas carbon, coal tar and ammonia liquor,

Answer:

When you think of veterinary medicine, what kinds of animals come to mind? Where would you expect to see these health-care experts working?

Explanation:

A laboratory researcher can determine if there are differences among the brine shrimp hatched in solutions of 0%, 1%, and 2% sodium chloride by comparing their survival rates and growth rates.

The researcher can set up three groups of brine shrimp, each group hatching in a different solution of sodium chloride concentration (0%, 1%, and 2%). The number of hatched brine shrimp in each group can be recorded initially. Over a specific period, the researcher can observe and record the survival rates of the brine shrimp in each group. This can be done by counting the number of surviving shrimp at regular intervals.

Additionally, the growth rates of the brine shrimp can be compared. The researcher can measure the length or mass of the shrimp in each group at specific time points. By analyzing the growth data, the differences in the growth rates of the brine shrimp hatched in different sodium chloride concentrations can be determined.

By evaluating both the survival rates and growth rates, the researcher can assess if there are significant differences among the brine shrimp hatched in the solutions of 0%, 1%, and 2% sodium chloride, providing valuable insights into the effects of sodium chloride concentration on brine shrimp development.

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Answer: yes

Explanation: its common sense

Explanation:

0.24 grams of LiOH are needed to make 100 ml of a 0.1 M solution

Answer:

Explanation:

Decreasing the volume of a contained gas will increase its pressure, and increasing its volume will decrease its pressure. In fact, if the volume increases by a certain factor, the pressure decreases by the same factor, and vice versa. Volume-pressure data for an air sample at room temperature are graphed in Figure 5.

Because the volume has decreased, the particles will collide more frequently with the walls of the container. ... When the volume decreases, the pressure increases. This shows that the pressure of a gas is inversely proportional to its volume. This is shown by the following equation - which is often called Boyle's law.

The kinetic energy of the gas molecules increases, so collisions with the walls of the container are now more forceful than they were before. As a result, the pressure of the gas doubles. Decreasing the temperature would have the opposite effect, and the pressure of an enclosed gas would decrease.

For a fixed mass of gas at constant temperature, the volume is inversely proportional to the pressure. That means that, for example, if you double the pressure, you will halve the volume. If you increase the pressure 10 times, the volume will decrease 10 times.

Temperature, pressure, volume and the amount of a gas influence its pressure.

Gay Lussac's Law - states that the pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature. If you heat a gas you give the molecules more energy so they move faster. This means more impacts on the walls of the container and an increase in the pressure.

i really hope some of this helped i would put more but its a lot too type

The correct answer is: Adaptation 1 is an adaptation to life cycle, Adaptation 2 is an adaptation to physical characteristics.

Adaptation is any heritable trait that helps organism such as a plant or animal, survive and reproduce in the environment.

Adaptation 1, where hornwort produces spores instead of seeds, is an adaptation to its life cycle, as spores are the reproductive structures that allow it to produce offspring.

Adaptation 2, where kangaroo paw has tiny, woolly hairs on it that help it hold onto water droplets, is an adaptation to its physical characteristics, as  hairs are a feature of its external anatomy that allow it to conserve water in its arid environment.

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Cx(H2O)y is the general formula for carbohydrates. Carbohydrates are the carbon hydrate in its natural form.

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Answer:

[H][OH] = 10^-7

[OH] = 10^-7/ 3.89x10^-7 = 0.257M

The pH of the solution after 40.3 mL of NaOH have been added to the acid is 1.09. The pH of a solution can be determined using the equation pH = -log[H+].

First, calculate the moles of HBr in the 20.00 mL sample using the formula moles = concentration x volume. Moles of HBr = 0.3000 mol/L x 0.02000 L = 0.00600 mol Moles of NaOH = 0.15 mol/L x 0.0403 L = 0.006045 mol .

Concentration of H+ ions = 0.006045 mol/ (0.02000 L + 0.0403 L) = 0.0814 M. Thus, pH = -log(0.0814) = 1.09. Therefore, the pH of the solution after 40.3 mL of NaOH have been added to the acid is 1.09.

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Answer: hope this helps!

Explanation:

Answer:

C2H5OH - 9 atoms

Explanation:

2C

5H

1O

1H

I think you wrote the formula for ethanol wrong but still with the one you wrote it is still 9.

The compound C₉H₁₀O₃ has possible stable structures which include include 3-phenylpropanoic acid methyl ester or 3-phenyl-2-butanone.

This compound has an IR spectrum with peaks at 2300-3200 cm⁻¹ (indicating the presence of C-H stretching vibrations), 1710 cm⁻¹ (indicating the presence of a carbonyl group), and 1600 cm⁻¹ (indicating the presence of an aromatic ring).

The 1H NMR spectrum for this compound would provide information about the hydrogen atoms in the molecule, including their chemical shift, integration (number of hydrogens represented by the signal), and multiplicity (splitting pattern caused by neighboring hydrogens).

Without the 1H NMR spectrum, it is difficult to determine the exact structure of the compound. However, based on the IR spectrum, the presence of an aromatic ring and a carbonyl group suggests that the compound may be a substituted aromatic ketone or ester.

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Answer:

Explanation:

Part 1

Proton is located in the nucleus and has a charge of +1

Neutron is located in the nucleus and has no charge.

Electron is located outside the nucleus and has a charge of -1. Amu is .00055.

Part 2

Potassium has 19 protons, (39 - 19 = 20 neutrons), and 19 electrons.

Calcium has 20 protons, (40 - 20 = 20 neutrons), and 20 electrons.

Part 3

Isotopes have different numbers of neutrons.

Most common isotope of carbon is carbon-12. Carbon-12 has 6 protons, 6 neutrons, and 6 electrons.

Boron-10 has 5 protons, 5 neutrons, and 5 electrons.

Boron-11 has 5 protons, 6 neutrons, and 5 electrons.

Note: In neutral elements, as you have here, the number of protons equals the number of electrons.

To find the number of protons, use the atomic number, which is above the symbol for the element on your worksheet.

To find the number of neutrons, subtract the protons from the mass of the element. Example Boron-11 has a mass of 11, so 11 - 5 protons = 6 neutrons.

The galaxy is the component of the universe which  contains all of the other components and would have the greatest mass.

A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity.The word is derived from the Greek galaxias , literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. Galaxies, averaging an estimated 100 million stars, range in size from dwarfs with less than a hundred million stars, to the largest galaxies known – supergiants with one hundred trillion stars,each orbiting its galaxy's center of mass.

Most of the mass in a typical galaxy is in the form of dark matter, with only a few percent of that mass visible in the form of stars and nebulae. Supermassive black holes are a common feature at the centres of galaxies.

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Answer:

you answer would be d

Explanation:

Answer:

d, Ca and Br: Calcium easily loses electrons, and bromine gains them

Explanation:

edge 2021

(:

Answer:

Oxygen receives two electrons from magnesium.

Explanation:

Hello!

In this case, considering the chemical reaction by which magnesium oxide is produced:

\(2Mg+O_2\rightarrow 2MgO\)

In that case, if we show up the oxidation states, we have:

\(2Mg^0+O_2\rightarrow 2Mg^{2+}O^{2-}\)

In such a way, since metals, like magnesium, have the capacity to lose electrons, rather than receive them, we infer why it turns out with +2 rather than -2; thus, we the correct answer is "oxygen receives two electrons from magnesium." because it results with -2 in MgO.

Best regards!

Answer:

Oxygen receives two electrons from magnesium.

Explanation:

Using an excess of a reactant in a chemical reaction ensures complete reaction, increases yield, compensates for side reactions or losses, and facilitates reaction monitoring.

It's is a common practice for several reasons:

Ensuring Complete Reaction: By providing an excess of one reactant, it ensures that the other reactant is entirely consumed in the reaction. This is particularly important when the stoichiometry of the reaction requires a specific ratio between the reactants.

Having an excess ensures that the limiting reactant is not exhausted prematurely, allowing the reaction to proceed to completion.

Increasing Reaction Yield: In some cases, having an excess of a reactant can increase the overall yield of the desired product. This is especially true when the excess reactant is less expensive or easier to handle than the other reactant.

By ensuring a surplus of the cheaper or more accessible reactant, the reaction can maximize the production of the desired product.

Compensation for Side Reactions or Losses: In complex reactions, side reactions or losses can occur, leading to a decrease in the yield of the desired product.

Having an excess of one reactant can help compensate for these losses by providing an ample supply to continue the main reaction pathway.

Facilitating Reaction Monitoring: In some cases, the excess reactant can act as a reference or marker, making it easier to monitor the progress of the reaction.

By tracking the consumption of the excess reactant, it becomes simpler to determine the extent of the reaction and the reaction rate.

It's important to note that the decision to use an excess of a reactant depends on the specific reaction and its requirements. Factors such as cost, reactant availability, and desired product yield need to be carefully considered when determining the appropriate stoichiometry for a reaction.

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A chemical reaction is a process where reactants are transformed into new products.

Reactants are the initial chemicals, and products are the new chemicals that are generated. There are times when the amount of reactants utilized in a reaction is more than the amount theoretically needed. This is known as an excess of reactants. The excess of reactants can be added for various reasons.

The reasons are as follows:

1.Incomplete reaction:

When a reaction is incomplete due to a lack of sufficient amounts of reactants, the reaction does not proceed to completion.

Therefore, to guarantee that the reaction goes to completion, it is critical to use an excess of reactants.

2. Reaction Yield:

Using excess reactants increases the yield of the desired product. This means that more products are generated.

3. Catalyst:

In certain reactions, the excess of reactants serves as a solvent or diluent that keeps the catalyst in an optimal concentration, hence allowing the reaction to continue at a faster pace.

For instance, in a reaction that employs sulfuric acid as a catalyst, excess sulfuric acid will keep the reaction going at a rapid pace.

4. Error margin:

When conducting experiments, it is important to have a good margin of error. Adding an excess of reactants ensures that there are enough reactants to get the desired product. The correct amount of reactants can be determined by calculating the percentage yield.

For example, if the theoretical yield is 100 g but the actual yield is only 150 g, the percentage yield will be (150 / 100) x 100 = 150 percent.

The given terms used in the answer are:

1. 1502. Excess3. Chemical

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Iron filings burning when sprinkled over a gas flame to produce iron(III) oxide is an example of a combustion reaction.

.In this case, the iron filings (Fe) react with oxygen from the gas flame to form iron(III) oxide (Fe₂O₃). The reaction can be represented by the following equation:

4Fe + 3O₂ → 2Fe₂O₃

During the combustion process, the iron filings undergo a chemical change as they combine with oxygen to form a new compound, iron(III) oxide. This reaction is exothermic, meaning it releases energy in the form of heat and light. The heat produced causes the iron filings to burn, resulting in the formation of iron(III) oxide.

Iron(III) oxide is a reddish-brown compound commonly known as rust. It has a different chemical composition and physical properties compared to the original iron filings. The reaction between iron and oxygen is highly exothermic, making it a suitable demonstration for the combustion process.

In summary, the burning of iron filings when sprinkled over a gas flame to produce iron(III) oxide is a combustion reaction where iron reacts with oxygen to form a new compound, releasing heat and light in the process.

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Answer: Energy is absorbed, and kinetic energy increases

Explanation:

Pls mark brainliest :)

Answer: 20 g

Explanation: heat received Q = m c dT

Q= 50J , dT= 25 C anc c= 0.10 J / g C

And m = Q / c dT

The mass of the iron sample that received the heat is determined as 20 g.

The mass of the iron sample is calculated as follows;

Q = mcΔT

where;

m = Q/cΔT

m = (50) / (0.1 x 25)

m = 20 g

Thus, the mass of the iron sample that received the heat is determined as 20 g.

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Answer and explanation

The solvent in the graph is water (H2O), water tells us that these substances dissolve at different amount of water, and the dissolvation is different in different temperatures in water. For example, NaCl readily dissolves in water.

If a photon of 254 nm is used, the excess energy (in J) over that needed for dissociation is 2.93 10^-19 J.

The bond-dissociation energy is defined as measure of the strength of a chemical bond which is represented as A−B. It can also be defined as the standard enthalpy change when the bond A−B is cleaved by homolysis to give two fragments A and B, that are usually radical species.

Energy of photon with λ 254 nm is given as

E = hC \ λ

= 6.626 × 10-³⁴ JS × 3 × 10 8 ms -1 /254 × 10 -9 m

= 7.83 10^-19 J

As we know that,

dissociation energy of HI = 295 10³ J. mol-¹

= 295 × 10³ J / mol -¹ / 6.023 × 10²³ mol -¹

= 4.898 10^-19 J.

Hence excess energy over dissociation

= 7.83 10^-19 J – 4.448 10^-19 J

= 2.93 10^-19 J

Thus, we concluded that the excess energy (in J) over that needed for dissociation is 2.93 10^-19 J.

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Answer:

i think its the first one

Explanation:

i could be wrong

Answer: Physical properties

Explanation: Can be measured without changing a substance's chemical identity.