Two 20.0 g ice cubes at −10.0 ∘C are placed into 285 g of water at 25.0 ∘C.
Assuming no energy is transferred to or from the surroundings, calculate the final temperature, f, of the water after all the ice melts.

Answer:

D. In an experiment, one of the variables will be giving a placebo and the other, a treatment

Explanation:

Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.

Answer:

The salt bridge serves to complete the electrical circuit in the galvanic cell. It is pertinent that the salt bridge ions are in high concentrations as this allows electron mobility and keeps each half cell electronically neutral. The diluted salt bridge wuld cause a buildup of positive charge in the anode and negative charge in the cathode and the electrode half reactions which either reduce or oxidise species would halt. Causing the cell to stop producing electronic energy, impedeing the proper functioning of the galvanic cell.

Yes, both of them are considered lewis structures

Lewis structures are ways in which the valence electron of a compound are arranged around its elements using dots. It represents and shows how electrons are arranged around individual atoms.

In lewis structure, electrons are represented as dots and if it is a bonding electron, it can be represented as lines. Since the elements in the compound given are both non-metals, they are covalently bonded. This shows the reason why one of the lewis structures contains lines.

Answer:

yes

Explanation:

So the balanced equation is 2 Mg + O 2 2 MgO.. ... Example: 2Mg + O2 -> 2MgO Magnesium and oxygen combine to form the compound magnesium oxide.

Thus, to balance the O2 we put a 2 in front of the MgO. However, now there are 2 Mg's in the products and only one Mg in the reactants. To balance the Mg we then put a 2 in front of the Mg in the reactant. All atoms are now balanced in the reaction

Answer:

Yes.

Explanation:

Oxygen has 2 atoms, and so does Magnesium.

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The total mass of the balloon and its content is 1521.17 g, the number of moles of CO₂ in the balloon is 34.15 mol, and the number of CO₂ molecules in the balloon is 2.06 x 10²⁵ molecules.

a) The molar mass of CO₂ is 44.01 g/mol. To find the total mass of the balloon and its content, we need to add the mass of the balloon (20g) to the mass of the CO₂ inside the balloon.

Mass of CO₂ = number of moles of CO₂ x molar mass of CO₂

Since the balloon is at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to find the number of moles of CO₂ in the balloon:

Volume of CO₂ = Volume of balloon = 765 L (at STP)

Number of moles of CO₂ = volume of CO₂ / molar volume of a gas at STP

                                          = 765 L / 22.4 L/mol

                                          = 34.15 mol

Mass of CO₂ = 34.15 mol x 44.01 g/mol

                       = 1501.17 g

Total mass of balloon and its content = 20 g + 1501.17 g

                                                               = 1521.17 g

b) Number of moles of CO₂ in the balloon is 34.15 mol

c) To find the number of CO₂ molecules in the balloon, we need to use Avogadro's number (6.02 x 10²³ molecules/mol).

Number of CO₂ molecules = number of moles of CO₂ x Avogadro's number

                                           = 34.15 mol x 6.02 x 10²³ molecules/mol

                                           = 2.06 x 10²⁵ molecules

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Answer:

I think the teacher was supposed to tell u the answer to that

The "Wakanda speech," six weeks have passed, and the world is still in shock.

Thus, Global leaders and analysts were taken aback by King T'Challa's declaration at the United Nations General Assembly that the Kingdom of Wakanda is not a developing country of textiles, farms, and shepherds with a GDP per person of roughly $760 but rather a technological superpower and Wakanda speech.

The country's widespread employment of cutting-edge magnetic levitation trains, flying machines, opaque holograms, and spinal cord-healing beads has led to the coining of the phrase "uber-developed" nation.

The most watched video ever is currently "Welcome to the Future," an introduction video created by Wakanda's recently established Ministry of Foreign Affairs.

Thus, The "Wakanda speech," six weeks have passed, and the world is still in shock.

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Answer:

C

Explanation:

Answer:

A.)

Explanation:

Answer:

Metals

Explanation:

Positive ions are formed when atoms give up some valence electrons in order to have a full octet. The atoms most likely to do this have a small number of valence electrons. Most to these atoms are generally in the s-block (left side) of the periodic table. These elements are metals.

*nonmetals are located in the p-block (right side) and noble gases are located in the 18th column (far right column)

A mole of hydrogen peroxide and mole of hydrogen chloride both represent the same number of particles, they are different substances with different chemical properties and different mass per mole.

Mole is a unit of measurement that represents a specific number of particles, which is approximately 6.022 x 10²³ particles. When we say "a mole of hydrogen peroxide (H2O2)" or "a mole of hydrogen chloride (HCl)," we are referring to the same number of particles, which is 6.022 x 10²³ particles of each substance.

Hydrogen peroxide (H2O2) and hydrogen chloride (HCl) are different substances with different chemical properties. H2O2 is a compound that consists of two hydrogen atoms and two oxygen atoms and HCl is a compound that consists of one hydrogen atom and one chlorine atom.

A mole of H2O2 has a different molar mass than mole of HCl, which means that they have different mass per mole. Molar mass of H2O2 is approximately 34 grams per mole whereas molar mass of HCl is approximately 36.5 grams per mole.

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Answer:

see below

Explanation:

.3 M/L ( .125 L) = .0375 mole required

.0375 mole / 2 mole / l = .01875 l required

take 18.75 ml of the 2.0 solution then dilute it to 125 ml

Answer:

Graduated cylinders are long, slender vessels used for measuring the volumes of liquids. They are not intended for mixing, stirring, heating, or weighing. Graduated cylinders commonly range in size from 5 mL to 500 mL.

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Answer:

5ml

Explanation:not sure why

Explanation:

hope it helps you

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Answer:

A.) 1

Explanation:

Propane only exists in one conformation. It does not have enough carbons to form branches, and there are only hydrogens attached to each carbon. Furthermore, there is no way to twist the carbon or change its orientation (ex. cis- and trans-) to result in a different structure of propane. There is no other way to represent the molecule without drawing a different molecule.

Answer:

Enzyme ? ...............

Answer:

\(\Delta H_{f,C_3H_4}=276.8kJ/mol\)

Explanation:

Hello!

In this case, since the equation we use to model the heat exchange into the calorimeter and compute the heat of reaction is:

\(\Delta H_{rxn} =- m_wC_w\Delta T\)

We plug in the mass of water, temperature change and specific heat to obtain:

\(\Delta H_{rxn} =- (35000g)(4.184\frac{J}{g\°C} )(2.316\°C)\\\\\Delta H_{rxn}=-339.16kJ\)

Now, this enthalpy of reaction corresponds to the combustion of propyne:

\(C_3H_4+4O_2\rightarrow 3CO_2+2H_2O\)

Whose enthalpy change involves the enthalpies of formation of propyne, carbon dioxide and water, considering that of propyne is the target:

\(\Delta H_{rxn}=3\Delta H_{f,CO_2}+2\Delta H_{f,H_2O}-\Delta H_{f,C_3H_4}\)

However, the enthalpy of reaction should be expressed in kJ per moles of C3H4, so we divide by the appropriate moles in 7.00 g of this compound:

\(\Delta H_{rxn} =-339.16kJ*\frac{1}{7.00g}*\frac{40.06g}{1mol}=-1940.9kJ/mol\)

Now, we solve for the enthalpy of formation of C3H4 as shown below:

\(\Delta H_{f,C_3H_4}=3\Delta H_{f,CO_2}+2\Delta H_{f,H_2O}-\Delta H_{rxn}\)

So we plug in to obtain (enthalpies of formation of CO2 and H2O are found on NIST data base):

\(\Delta H_{f,C_3H_4}=3(-393.5kJ/mol)+2(-241.8kJ/mol)-(-1940.9kJ/mol)\\\\\Delta H_{f,C_3H_4}=276.8kJ/mol\)

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Answer:

Silicopropane

Explanation:

Answer:

CO2 (Carbon Dioxide) has a negative impact on environment.

Explanation:

CO2 is a product of combustion of Methane

The carbon dioxide product of the reaction of methane includes an influence on the environment. So, not only does methane contribute to global warming instantly but even, indirectly via the release of carbon dioxide.

As methane exists emitted into the air, it responds in several dangerous ways. It predominantly leaves the atmosphere through oxidization, comprising water vapor and carbon dioxide. Methane inhalation can result in mood modifications, slurred speech, vision problems, memory loss, nausea, vomiting, facial flushing, and headache. In severe cases, there may be differences in breathing and heart rate, balance concerns, numbness, and unconsciousness.

Hence, The carbon dioxide product of the reaction of methane includes an influence on the environment. So, not only does methane contribute to global warming instantly but even, indirectly via the release of carbon dioxide.

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Magnesium fluoride is the name of the ionic substance that results from the union of magnesium and fluoride ions. The compound has the chemical formula MgF2 Mg F 2.

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Answer:The colour and distribution of the organism's biochromes

Explanation:

The colour and distribution of the organism's biochromes (pigments), particularly the relative location of differently coloured areas; the shape, posture, position, and movement of the organism; and the quality and quantity of light striking the organism

The discovery that water vapor will stick to smoke particles is relevant to cloud seeding, which is the process of introducing substances into clouds to promote the formation of rain or other forms of precipitation.

By dispersing smoke particles or other suitable substances into clouds, water vapor can condense around these particles and form water droplets, eventually leading to the development of rain. This technology is used in situations where there is a need for additional rainfall, such as in areas experiencing drought or in agricultural settings where water is needed for crop growth. Cloud seeding can help enhance precipitation and increase water resources, contributing to water supply management and agricultural practices.

Hence, the correct statement is option d seed clouds to produce rain.

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2.65g/ml is the density of a piece of granite whose volume is 20 mL and mass is 53grams. Density is the mass of a specific material per unit volume.

Density is the mass of a specific material per unit volume. Density is defined as d = M/V, in which d represents density, M is weight, as well as V is volume. Density is generally expressed in grams every cubic centimetre. Water, for example, has a density of 1 gram per square centimeter, but Earth has a density of 5.51 kilograms per cubic centimetre.

Density is sometimes measured in kilos per cubic centimeter (in metre-kilogram-second or SI units). The density of air, for example, is 1.2 kilos per cubic metre. 

density = mass / volume

            =53/ 20

            =2.65g/ml

Therefore, 2.65g/ml is the density of a piece of granite whose volume is 20 mL and mass is 53grams.

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The learning activities titled "Hypothesis," "Variables and Hypothesis," and "Constructing a Hypothesis" all share certain similarities and differences. A question that arises in response to an observation is similar to a scientific research question in that both require some level of investigation to achieve an answer. However, scientific research questions are typically more specific and refined, with a defined methodology for obtaining data and verifying results.

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If you're attempting to synthesize 2 benzyl pentanoic acid from acetoacetic ester, keep in mind that you can do so fairly quickly by following these simplified instructions:

From its pungent free scent to its solid state at temperatures ranging from 118 120°C, acetoacetic ester (better known as ethyl acetoacetate) offers significant value for those working within organic synthesis.

As one of many potent ketones utilized by researchers around the globe its unique properties make it ideal for building complex molecules essential for modern medicine and more.

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The statement that best described how the space program improved the culture in Florida is that the space program changed the education system, increased tourism, and created technology to help people.

Florida's culture and economy were significantly impacted by the space program. The impact on education was one of the most significant ways. Many young people were motivated to pursue STEM (science, technology, engineering, and mathematics) careers by the space program. This prompted the development of institutions and educational programs devoted to these fields, aiding in Florida's development of a highly skilled labor force.

The space program also increased tourism in Florida because people from all over the world traveled to Florida to see space launches and to visit the Kennedy Space Center. This increased employment opportunities and state revenue.

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