A company is designing a new cell phone. They need a solid material that conducts electricity and can be made into a thin wire.

Which material would best fit their needs?

Answer:

Explanation:

For what?

The solubility of a substance, such as sugar, depends on several factors, including temperature, pressure, and the presence of other solutes. In this case, the student adds the same amount of sugar and tea bag to the same amount of hot water every day, but the temperature of the water could vary from day to day, affecting how much sugar dissolves.

According to the graph, the least amount of sugar dissolved on day 3, while the most sugar dissolved on day 5. The difference in temperature on these days could explain this variation. On day 3, the water may have been cooler, making it more difficult for the sugar to dissolve. On the other hand, on day 5, the water may have been hotter, which could have increased the solubility of the sugar.

To increase the amount of sugar that dissolves in the tea, the student could try using hotter water or stirring the sugar more vigorously to distribute it evenly throughout the water. Alternatively, the student could try adding the sugar gradually while stirring to give it more time to dissolve before adding more.

Answer:

I'm not 100% sure on this because mine hasn't been graded yet, but here are the answers I submitted.

Explanation:

Which day the least sugar dissolved and which day the most sugar dissolved:

Day 4 is when the least sugar dissolved, and Day 2 is when the most sugar dissolved.

What could have caused less sugar to dissolve on some days:

The temperature of the tea could have caused the sugar not to dissolve on some days.

What the student could do to his drink to make more sugar dissolve.

The student would need to add the sugar to the tea as soon as it's done boiling.  The Sugar will dissolve faster in a warmer tea due to more energy of movement.  

Be sure to stir the tea as you add the sugar.  Stirring the sugar into the tea speeds up the rate of dissolving by helping distribute the sugar particles throughout the tea.  

If the student were to use granulated sugar, those are smaller particles and have greater surface area.  Greater surface area allows for more contact between the tea and the sugar.

The standard enthalpy change (∆H°rxn) for the given reaction is -38.0 kJ/mol. This negative value indicates that the reaction is exothermic, meaning that it releases heat to the surroundings.

The standard enthalpies of formation (∆Hf°) for the reactants and products involved in the reaction are: ∆Hf°[NO2(g)] = +33.2 kJ/mol. ∆Hf°[H2O(l)] = -285.8 kJ/mol. ∆Hf°[HNO3(aq)] = -207.2 kJ/mol. ∆Hf°[NO(g)] = +90.4 kJ/mol. We can use these values to calculate the standard enthalpy change (∆H°) for the reaction using the following equation:

∆H°rxn = Σn∆Hf°(products) - Σm∆Hf°(reactants) where n and m are the stoichiometric coefficients of the products and reactants, respectively. Substituting the values, we get:∆H°rxn = [2 × ∆Hf°(HNO3(aq))] + [∆Hf°(NO(g))] - [3 × ∆Hf°(NO2(g))] - [1 × ∆Hf°(H2O(l))]. ∆H°rxn = [2 × (-207.2 kJ/mol)] + [90.4 kJ/mol] - [3 × (+33.2 kJ/mol)] - [1 × (-285.8 kJ/mol)]. ∆H°rxn = -414.4 kJ/mol + 90.4 kJ/mol - 99.6 kJ/mol + 285.8 kJ/mol. ∆H°rxn = -38.0 kJ/mol

Therefore, the standard enthalpy change (∆H°rxn) for the given reaction is -38.0 kJ/mol. This negative value indicates that the reaction is exothermic, meaning that it releases heat to the surroundings.

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Valence electrons are the electrons in the outermost shell of an atom and are responsible for chemical reactions. In a chemical reaction, atoms gain or lose electrons to achieve a stable electron configuration, which is known as the octet rule. The number of valence electrons an atom has determines its chemical reactivity and how it will bond with other atoms. For example, atoms with only a few valence electrons, such as hydrogen, are highly reactive and will readily form chemical bonds, while atoms with many valence electrons, such as noble gases, are relatively unreactive and do not easily form chemical bonds.

Answer:

We will use an acid-base indicator to see changes in colour depending on the pH  

Explanation:

The pH changes during a titration, so you could use an acid-base indicator to follow the changes in pH.

A is wrong. An acid-base titration does not usually form a solid, and it would be impractical to isolate a solid with a funnel.

B is wrong. There are no changes in mass.

C is wrong. Any changes in temperature would be too small to measure precisely with an ordinary thermometer.

The best way to monitor the progress of a neutralization reaction such as acid-base titration: D. Use an acid-base indicator to observe the changes in color depending on the pH.

The chemical reaction that occurs when you mix an acid and a base together is referred to as neutralization reaction.

In a neutralization reaction, what is formed is salt and water.

Acid-base titration is a neutralization method.

During acid-base titration, the neutralization reaction that occurs is usually monitored by observing the pH changes that occurs.

Change in pH is an indicator that there is progress in the neutralization reaction.

An acid-base indicator, can be used to detect the changes that occur via the pH changes in relation to the color change.

Therefore, the best way to monitor the progress of a neutralization reaction such as acid-base titration: D. Use an acid-base indicator to observe the changes in color depending on the pH.

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Based on the given data, the amount of products from 5.00 g of KClO₃ is:

The decomposition of KClO₃ is given by the equation below:

2 KClO₃  -----> 2 KCl + 3 O₂

2 moles of KClO₃ produces 2 moles of KCl and 3 moles of O₂

Molar mass of KClO₃ is 122.5 g/mol

molar mass of KCl = 74.5 g

molar mass of O₂ = 32 g

Moles of KClO₃ in 5.00 g = 5.00/122.5

For KCl

a. moles: 0.04 moles of KClO₃ will produce 0.04 moles of KCl

b. mass of KCl = 0.04 * 74.5 = 2.98 g KCl

c. number of molecules of KCl = 0.04 * 6.02 * 10²³ = 2.41 * 10²² molecules of KCl

For O₂:

a. moles of O₂; 0.04 moles of KClO₃ will produce = 0.06 moles of O₂.

b. mass of O₂ = 0.06 * 32 g = 1.92 g of O₂

c. number of molecules: 0.06 * 6.02 * 10²³ = 3.61 * 10²² molecules of O₂

Therefore, the amount of products from 5.00 g of KClO₃ is:

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Answer:

mark me brilliant

To determine the mass of ammonia that can be produced from 40.5 g of N₂, we need to use stoichiometry and the balanced chemical equation provided.

From the balanced equation, we can see that 1 mole of N₂ reacts with 3 moles of H₂ to produce 2 moles of NH₃. Therefore, we need to calculate the number of moles of N₂ in 40.5 g:

Number of moles of N₂ = mass / molar mass = 40.5 g / 28 g/mol = 1.4464 mol N₂

Using the mole ratio from the balanced equation, we can calculate the number of moles of NH₃ produced:

Number of moles of NH₃ = (1.4464 mol N₂) x (2 mol NH₃ / 1 mol N₂) = 2.8928 mol NH₃

Finally, we can use the molar mass of NH₃ to convert the number of moles to mass:

Mass of NH₃ = number of moles x molar mass = 2.8928 mol x 17 g/mol = 49.11 g

Therefore, the mass of ammonia that can be produced from 40.5 g of N₂ with excess H₂ is 49.11 g.

Answer:

Explanation:

The first step is to determine the limiting reactant. In this case, we have 40.5 g of N₂ and excess H₂. We can use the molar mass of each substance to determine the number of moles of each reactant:

N₂: 40.5 g / 28.01 g/mol = 1.45 mol

H₂: 40.5 g / 2.016 g/mol = 20.1 mol

Since we have less moles of N₂ than H₂, N₂ is the limiting reactant. This means that the amount of ammonia produced will be determined by the amount of N₂.

We can use the balanced equation to determine the mass of ammonia produced:

1 mol N₂ → 2 mol NH₃

1.45 mol N₂ → 2.90 mol NH₃

2.90 mol NH₃ * 17.03 g/mol = 50.4 g NH₃

Therefore, 50.4 g of ammonia can be produced from 40.5 g of N₂ with excess H₂.

Two examples of potential energy are gravitational potential energy and elastic potential energy.

Gravitational potential energy is the energy stored in an object due to its position in a gravitational field. For example, a book placed on a shelf has gravitational potential energy because it has the potential to fall to the ground due to the force of gravity.

Elastic potential energy is the energy stored in an object when it is deformed, such as when a spring is compressed or stretched. For example, a compressed spring has elastic potential energy because it has the potential to return to its original shape and release the stored energy when it is released.

Other examples of potential energy include chemical potential energy, which is the energy stored in the bonds between atoms in a molecule, and nuclear potential energy, which is the energy stored in the nucleus of an atom.

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Answer: 2ML

Explanation: all you needed to do was to subtract

Answer:

Explanation:

40/ 180.2 x (-16 / 1 mole glucose)=-3.6 KJ

Answer:

3. Physical properties can be observed and chemical properties can't

The savanna grassy plain environment would best support large land animals like giraffes elephants and lions.

A dry climate with a distinct wet and dry season, as well as moderate to high temperatures is observed in savannas. Grass species which can withstand seasonal droughts and frequent fires, predominate in savanna vegetation. Although they are more widely spaced than in other forested environments, trees and shrubs are still present.

Large land animals thrive in the savanna because it offers a variety of food sources, such as grasses, leaves and fruits, as well as plenty of room to move around and find resources. Animals can see each other clearly and communicate effectively in the open grasslands and the scatted trees and shrubs provide shelter from the sun and wind.

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The product of the reaction when 1-bromobutane is exposed to magnesium, followed by acetone and then aqueous acid is 1-pentanol.

A Grignard reagent is an alkyl magnesium halide which can be converted to different products via chemical reactions. The Grignard reagent is a synthetic route to many compounds.

The product of the reaction when 1-bromobutane is exposed to magnesium, followed by acetone and then aqueous acid is 1-pentanol.

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Answer:

             2-Methyl-2-hexanol

Explanation:

                    1-bromobutane when reacted with Magnesium in ether forms a Grignard reagent.

                    The Grignard reagent reacts with carbonyl compounds to produce corresponding alcohols.

                   Primary alcohols are formed when the carbonyl compound is formaldehyde.

                    Secondary alcohols are formed when the carbonyl compound is any aldehyde other than formaldehyde.

                    Tertiary alcohols are formed when Grignard reagent is reacted with ketones.

                    In given question the carbonyl compound is Acetone (ketone) hence the final product will be a tertiary alcohol.

Answer:

im gonna say b

Explanation:

The steps of how plants get energy in the correct order is as follows:

Photosynthesis is the process by which plants and other photoautotrophs convert light energy into chemical energy.

Photosynthesis is carried out by the cells of green plants to synthesize their food in form of sugar powered by the energy from sunlight.

The cells in the leaf use the energy from the sun (light energy) and produce sugars (chemical energy). After which, the sugars are broken down to release energy for use by the cells in a process called cellular respiration.

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Answer:

Cells are the basic structures of all living organisms. Cells provide structure for the body, take in nutrients from food and carry out important functions. ... These organelles carry out tasks such as making proteins?, processing chemicals and generating energy for the cell

Answer: I absolutely love this question! Biology is so interesting, so I always love to answer the curiosity of others regarding biology, such as that!

Cells are simply the basic structures of all organisms, that are living, of course! Cells provide structure for the body, and they also take in nutrients that your body needs from food and they carry out important functions. These organelles carry out tasks such as making proteins, processing chemicals, and generating energy for the cell. Isn’t that cool?

Hope this helped! <3

The molar mass of the compound is = 1.42g/ mol

∆Tb = kB × molarity

∆Tb = 102.3°C

Kb = 0.510 °C/m

Molarity= electrolyte mass × water solubility/ Mw× mass of water.

That is,

102.3°C= 0.51× 83.5×1000/Mw × 291.7

Make Mw the subject of formula,

Therefore,

Mw = 0.51 × 83.5×1000/ 102.3 × 291.7

Mw= 42,585/29,840.91

Mw= 1.42g/mol

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Answer:

It is D low precision, high accuracy

Explanation:

I got it correct

The Xs show the location of beanbags a student tossed at a target. The student was aiming for the center circle. Low precision, high accuracy​  best describe the student's results. Therefore, option D is correct.

There are two ways to assess observational error: accuracy and precision. Precision measures how closely two measurements are to one another, whereas accuracy measures how close a group of measurements is to its actual value. In other words, precision is a measure of statistical variability and a description of random errors.

The proximity of two or more measurements to one another is referred to as precision. Using the aforementioned example, your measurement is extremely accurate if you weigh a certain substance five times and obtain 3.2 kg each time. Accuracy is not necessary for precision.

Regardless of whether or whether two or more measurements are correct, precision is described as "the property of being exact" and relates to how close two or more measurements are to one another.

Thus, option D is correct.

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(i)hydrosulfuric acid; (ii) dinitrogen monoxide; (iii) cesium oxide are the correct answers.

What are compounds ?

Compounds are substances made up of two or more different types of atoms that are chemically bonded together in a specific ratio. The atoms in a compound are held together by chemical bonds, which are formed when the atoms share or transfer electrons in order to achieve a more stable electron configuration.

There are many different types of compounds, including covalent compounds, ionic compounds, and metallic compounds.Covalent compounds are formed when atoms share electrons in order to complete their valence electron shells. Ionic compounds are formed when electrons are transferred from one atom to another, resulting in the formation of positive and negative ions that are attracted to each other by electrostatic forces.

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The given statement "A parasitic way of life can be best demonstrated by the feeding adaptations of the spider." is False. Because, While some spiders are parasites, not all spiders are parasitic.

Additionally, many spiders are not even true parasites, as they typically do not harm their host organism. Spiders are typically classified as predators, as they feed on other insects and arthropods. While some spiders may occasionally feed on the blood of larger animals, such as birds or mammals, this behavior is not typically considered parasitic, as it does not involve a long-term relationship between the spider and the host organism.

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To kill bacteria, chlorine is added to the water. However, it does not function immediately away and kill CDC.

Thus, When handled correctly, free chlorine* can destroy the majority of bacteria in a matter of minutes.

The CDC advises maintaining a pH of 7.2–7.8 and free chlorine levels of at least 1 ppm in swimming pools and 3 ppm in hot tubs and spas.

The CDC advises a pH of 7.2–7.8 and a free accessible chlorine content of at least 2 ppm in swimming pools when using cyanuric acid, a chlorine stabilizer, or chlorine products containing cyanuric acid (for instance, products generally known as dichlor or trichlor. The CDC advises against using cyanuric acid or chlorine products containing it in hot tubs or spas.

Thus, To kill bacteria, chlorine is added to the water. However, it does not function immediately away and kill CDC.

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Answer:

Acetone.

Explanation:

Hello,

In this case, we can distinguish between polar solvent and nonpolar solvent by the nature of the bonds present in the compound. Thus, since the bonds C-Cl, C-C, C-H and C-O are nonpolar, which are contained in the toluene, carbon tetrachloride, diethyl ether and hexane, they are discarded as polar.

Nevertheless, since the carbonyl group contained in the acetone is a polar because of the formed positive and negative charges, it is actually the polar solvent, acting as an exception. This is substantiated by the fact the acetone is soluble in water whereas the other substances not,

Regards.

ANSWER

The pressure of the gas is 3.9 atm

EXPLANATION

Given information

The volume of the gas = 5L

The temperature of the gas = 27 degrees Celcius

The number of moles = 0.8 moles

To find the number of moles, we will need to apply the below formula

Where

P = pressure

V = volume

n = number of moles

R = gas constant

T = Temperature

Recall, that the gas constant is 0.082005 L atm mol^-1 K^-1

The next step is to convert the temperature from degrees Celcius to Kelvin

The next step is to substitute the given data into the formula in order to find the pressure of the gas

Hence, the pressure of the gas is 3.9 atm

Answer:

a. in pure water Solubility (x) = 1.26 x 10⁻⁴M

b. in 0.202M M⁺² Solubility (x) = 9.963 x 10⁻¹²M

The large drop in solubility is consistent with the common ion effect.

Explanation:

a. Solubility in pure water

Given:       M(OH)₂ ⇄ M⁺² + 2OH⁻

            I       ---            0          0

           C      ---             x          2x

           E       ---            x           2x

Ksp = [M⁺²][OH⁻]² = (x)(2x)² = 4x³ => x = CubeRt(Ksp/4)

solubility in pure water = x = CubeRt(8.05 x 10⁻¹²/4) = 1.26 x 10⁻⁴M

b. Solubility in presence of 0.202M M⁺² as common ion.

Given:       M(OH)₂ ⇄       M⁺²      +     2OH⁻

            I       ---            0.202M              0

           C      ---                 +x                 +2x

           E       ---           0.202M + x         2x

                                   ≈ 0.202M

Ksp = [M⁺²][2x]² = (0.202)(2x)² = (0.202)(4x²) = 8.05 x 10⁻¹²

=> x = (8.05 x 10⁻¹²)/(0.202)(4) = 9.963 x 10⁻¹²M

Answer:

2, 19, 12 and 14 are the coefficients.

Monounsaturated Fat 1g

The actual result of the calculation is 101.920. Therefore, none of the options provided in the question matches the correct answer.

To calculate the given expression: (43 × 2.310) + (7 × 0.370), we perform the multiplication first and then add the results.

Multiplying the counted numbers:

43 × 2.310 = 99.330

Multiplying the measured numbers:

7 × 0.370 = 2.590

Now, we add the results:

99.330 + 2.590 = 101.920

The correct answer is not provided in the given options: a) 38.35, b) 38.4, c) 38, or d) 40.

The actual result of the calculation is 101.920. Therefore, none of the options provided in the question matches the correct answer.

It's important to note that when performing calculations, it is crucial to accurately follow the order of operations (multiplication before addition) and ensure precision when dealing with decimal numbers.

In this case, the correct answer is not among the options provided, and the accurate result is 101.920.

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Answer:

Phylum

Explanation:

After that it goes class, order, family, genus, and finally species. In that order, BTW before kingdom is domain.

Answer:

Phylum

Explanation:

Activation energy is the energy needed to begin breaking the bonds of reactants. Hence, option A is correct.

Activation energy is defined as the minimum amount of energy necessary to initiate a chemical reaction.

Hence, activation energy is the energy needed to begin breaking the bonds of reactants.

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