What does the yellow star in the picture represent

Answer:

2-pentanone

Explanation:

The oxygen atom is attached to the 2nd carbon atom in the longest linear chain, thus the prefix 2. the longest continuous carbon chain has five carbon atoms giving it the prefix pent-. the chemical is a ketone thus the suffix none.

Answer:

First one is 5.0 M ammonia and the Second one ?

Explanation:

Lydia and Damian will select bases with low kb that are present in highly concentrated solutions in the storage cabinet.

In a chemical process, bases are compounds that can accept hydrogen ions (H+). They often taste bitter, are slippery to the touch, and have the ability to change the color of litmus paper from red to blue. Typical examples of bases are sodium hydroxide (NaOH), ammonia (NH3), and baking soda (sodium bicarbonate, NaHCO3). Acids, which cause a chemical reaction to release hydrogen ions (H+), are the opposite of bases.

The ability of a base to accept hydrogen ions determines the strength of the base. While weak bases, such as ammonia, have a low affinity for hydrogen ions and can only partially dissociate in water, strong bases, such as sodium hydroxide, have a high affinity for hydrogen ions and can dissociate completely in water. Alkalis play an important role in many chemical processes.

Therefore, Lydia and Damian will select bases with low kb that are present in highly concentrated solutions in the storage cabinet.

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acidic tap water form green layer ofcarbonate on copper surface which prevent it from corrosion but iron when react to water and oxygen form rust

also fe lies above than cu in activity series

The chemical reactivity of copper is less than iron and with the formation of stable copper oxide, copper pipes are less likely to corrode.

The corrosion or  rusting is the chemical phenomenon given by an element that results in the decomposition of the metal into stable oxide.

The copper metal in the presence of oxygen  forms the more stable and unreactive copper oxide that protect the metal from corrosion.

The chemical equation for the formation of copper oxide is:

4 Cu + O₂ → 2 Cu₂O

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Answer:

Ammeter

Explanation:

An ammeter (from Ampere Meter) is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters.

Answer:

V = 48.7 L

Explanation:

We can calculate the volume V, by using the ideal gas law:

P V = n R T

Where we have:  

P is the pressure, V is the volume, and T is the temperature T, R is the gas constant, and n is the number of moles of the gas.  

According to the international unit systems R is 8.314 J / K. mol.  

With this value the P unit will be Pa and the V unit will be m³.  

Then,  

V = (n R T)/ P  

V = [(36/18) × 8.314 × 293] / (100 * 1000)  

V = 0.0487 m³  

And the volume by litter unit is:  

V = 48.7 L

Answer:

N₂ + 3H₂ → 2NH₃. "synthesis reaction".

Explanation:

To balance the equation, you should apply the law of conservation of mass for the equations.

The law of conservation of mass states that the no. of each atom is equal in both sides (reactants and products).

The balanced equation is:

N₂ + 3H₂ → 2NH₃.

It is a synthesis reaction that 2 reactants give 1 product.

That 1.0 mole of N₂ reacts with 3.0 moles of H₂ to produce 2.0 moles of NH₃.

The no. of all atoms is the same in both of reactants and products side.

N (2), and H (6).

The extensive properties come under physical property which depends on the size of the system. The enthalpy comes under extensive property which is a thermodynamic property where the internal energy; and the pressure and volume of the system is related.

The change in enthalpy is related to energy transfer at certain pressure which is related to the endothermic and exothermic reactions taking place on the system. Since, all these reactions and heat transfer from the system to the environment is based on the physical property, enthalpy is called as extensive property.

The mass of oxygen atoms in 1 mole of water is 16 grams.

This can be calculated by looking at the molecular formula of water, which is H2O. From this formula, we know that one molecule of water contains two hydrogen (H) atoms and one oxygen (O) atom.

Given that the molar mass of hydrogen is 1 gram/mole and the molar mass of oxygen is 16 grams/mole, we can determine that the mass ratio of hydrogen to oxygen in a water molecule is 2:1.

Therefore, in 1 mole of water, we have 2 moles of hydrogen atoms and 1 mole of oxygen atoms.

Multiplying the molar mass of oxygen (16 grams/mole) by the number of moles (1 mole) gives us a mass of 16 grams for the oxygen atoms in 1 mole of water.

Answer:

The rate of forward reaction increases.

Explanation:

Increasing the volume of oxygen:

will increase the concentration of oxygen (reactants), so the equilibrium will be shifted to the right side (products side) to suppress the effect of increasing the volume of oxygen.

So, the right choice is: The rate of forward reaction increases.

Answer:

berm

a berm can be somethint in the middle or water and you can see it once the water go down oe dryes

Answer:

NH₄⁺

H₂PO₄⁻

H₃O⁺

Explanation:

So, the species that are ions are:

NH₄⁺

H₂PO₄⁻

H₃O⁺

Answer:

NH₄⁺

H₂PO₄⁻

H₃O⁺

Explanation:

The amount of heat needed to vaporize the given amount of water is the product of the amount in grams and the latent heat of vaporization in cal per gram. That is,

                              H = (540 calories / gram)( 500 grams) = 270,000 cal

Thus, the heat needed is 270, 000 calories. The answer is letter C.

Hope this helps :) thats just a sh

Answer:

270,000 cal

Explanation:

In order to calculate the calories needed to completely vaporize 500 grams of water we just have to use the formula of the latent heat of vaporization, we know that it takes 540 calories to vaporize a gram of water, so we just multiply that by the number of grams:

(500 grams of water)(540 calories/gram)= 270,000 calories

It would taje 270,000 calories to vaporize 500 grams of water.

For a manual transmission, park in first gear when facing uphill, and in reverse when facing downhill, always using the parking brake and turning the wheels away from the curb when parked uphill.

When parking uphill in a car with a manual transmission, it is generally recommended to park with the transmission in first gear if you are facing uphill and reverse gear if you are facing downhill. This helps to ensure that if your parking brake fails, the engine will help prevent the car from rolling. However, always remember to use the parking brake regardless of the gear used. It is also advisable to turn your wheels away from the curb when parking uphill, so in the event your car begins to roll, it will roll into the curb which can help stop the car.

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Answer:

Explanation:

                  Fe + Cl₂ →  FeCl₃

a. The balanced equation

    All chemical equations obey the law of conservation of matter. To balance this above equation, we either inspect or use mathematical method to obtain a balanced equation.

We put coefficients a, b and c at the back of the compounds as shown below:

                    aFe + bCl₂ →  cFeCl₃

For Fe:

      a = c                          (i)

For Cl:

     2b = 3c                        (ii)

let a = 1, c= 1

Solving for the unknown b, we have:

          b = [tex]\frac{3c}{2}[/tex]

           b = [tex]\frac{3}{2}[/tex]

The complete reaction equation is therefore:

            Fe + [tex]\frac{3}{2}[/tex]Cl₂ →  FeCl₃

                                     or

                       2Fe + 3Cl₂ →  2FeCl₃

Problem a:

Mass of reacting iron = 25g

unknown: number of moles of iron

Solution

To find the number of moles, we apply the mole concept using the expression below:

[tex]number of moles = \frac{mass}{molar mass} \\[/tex]

To find the molar mass of the reactant iron, we know atomic mass of iron is 56g.

The molar mass is therefore, 56gmol⁻¹

[tex]number of moles = \frac{25}{56} \\[/tex]

number of moles of the iron reactant  = 0.45mole

Problem b:

From the balanced equation of the reaction:

             2Fe + 3Cl₂ →  2FeCl₃

      2 moles of Fe produces 2 moles of FeCl₃

     So 0.45mole of Fe would produce 0.45 mole of FeCl₃

Problem C:

Applying the mole concept;

      mass of FeCl₃ = number of moles of FeCl₃ x molar mass of FeCl₃

     number of moles of FeCl₃ = 0.45mole

     molar mass of FeCl₃ = ?

Atomic mass of Fe = 56g

                          Cl = 35.5g

      Molar mass of FeCl₃ = 56 + (3 x 35.5) = 56 + 106.5 = 162.5gmol⁻¹

mass of FeCl₃ = 0.45 x 162.5 = 73.1g

Answer:

Pb + 2AgNO3 --->   Pb(NO3)2 + 2Ag

Explanation:

The lead Pb2+ ion has a valency of 2 and therefore combines with 2 nitrate ions (NO3)-..

[tex]Pb + 2AgNO_3[/tex]  →  [tex]Pb(NO_3)_2 + 2Ag[/tex]

An equation that has an equal number of atoms of each element on both sides of the equation is called a balanced chemical equation.

[tex]Pb + 2AgNO_3[/tex]  →  [tex]Pb(NO_3)_2 + 2Ag[/tex]

This is the balanced chemical equation. Where there are 1 Pb, 2 Ag, 2N, and 6 oxygen atoms on both sides.

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Answer:Petroleum is a naturally occurring complex mixture made up predominantly of carbon and hydrogen compounds

Explanation:

Answer:

Since this is an ionic compound, you must balance the charges so that overall charge of the compound is neutral. Sodium, an alkali metal, has a tendency to lose one electron. As a result sodium normally carries a positive one charge. Sulfur, a nonmetal, has a tendency to gain 2 electrons.

Explanation:

Answer:

Sodium commonly forms a

+

I

ion.

Explanation:

And thus the chemical formula for sodium sulfide is

Na2S , i.e. two sodium ions are required to form a neutral salt with

S2-

Answer:

100 mL Graduated cylinder.

Explanation:

The instrument would give the greatest precision is 100 mL Graduated cylinder.

Because it has the smallest diameter and it is graduated every 1.0 mL. so, its error percent is the lowest.

Beaker and Erlenmeyer flask have a greater diameter and their grauation is every 10.0 mL. So, their error % is larger.

Answer:

The answer would be 100 ml graduated cylinder

Explanation:

Answer:

Explanation:

Method 1 proportion

1 mole of chromium is 52 grams

11.9 moles = x grams

1/11.9 = 52/x                    Cross multiply

x = 11.9 * 52

x = 618.8                         grams

Now I have used an approximate mass for Chromium. The answer you get here is expected to reflect the weigth given on your periodic table Use that to get your answer. You should give a number very close to mine. Round to 3 places as in 619.

Method Two  Formula

mols = given mass / molecular mass

11.9 = given mass /  51.9961          Multiply both sides by  51.9961

11.9 *51.9961  = given mass            

given mass = 618.75

given mass = 619

Answer: A. A photon was released.

An electron moved from a higher energy level to a lower energy level. What most likely happened during the transition? (5 points)

A. A photon was released.

B. A photon was absorbed.

C. A fixed amount of energy was absorbed.

D.  A random amount of energy was released.

Explanation:

I just took the test and A. A photon was released is the correct answer!

Good Luck!!

( P.S.- I just used the other answer on the test and it was incorrect, but this one is correct because I finished the test and got the answer key!)

During the electron's transition from a higher to a lower energy level, it most likely released energy, possibly in the form of light, consistent with Bohr's model of the atom.

When an electron moves from a higher energy level to a lower energy level, it most likely emitted energy. This concept is grounded in Bohr's model of the atom where each electron orbit is an energy level with a specific energy value. A transition between these levels involves a change in the electron's energy, corresponding to the energy difference between the levels.

For example, if an electron moves from level 8 to level 1, it descends through several energy levels and, according to Bohr's model, emits energy at each transition. This energy can be quantified, such as in the change of -10.2 eV from a higher to a lower state, releasing 10.2 eV of energy. The emitted energy often manifests as light, with the color depending on the energy change involved.

Answer: 1 = 1e-5

Explanation: Divide the pressure value by 100000

Metallic element in list of paper is Titan.

C) the basic unit of inheritance

Answer:

Deforestation, increase wildlife extinction, ecosystem imbalances, soil erosion, migration and loss of species.

Explanation:

Global warming is warming the earth's surface temperature, which causes the changes in our ecosystem like deforestation, soil erosion, climate changes, migration and loss of species etc.

Global warming is caused by the 'Greenhouse effect', major gases are carbon dioxide(9-26%), methane(4-9%), water vapour(36-70%) ozone(3-7%) and nitrous oxide.    

Global warming affects on the ocean include rising sea level, meiting glaciers, thermal expansion and ice sheets. It also cause the bird migration which carries high cost of predation and mortality.

Answer:

D. altered ecosystems

Explanation:

Deforestation, increase wildlife extinction, ecosystem imbalances, soil erosion, migration and loss of species are all effects of global warming. These are under the umbrella of consequences from global warming.

The equivalent weight is the gram molecular weight divided by the number of electrons lost or gained by each molecule; For sodium thiosulfate (Na2S2O3·5H2O), this is (248.17/1) g.

An endothermic reaction occurs when the energy used to break the bonds in the reactants is greater than the energy given out when bonds are formed in the products. This means that overall the reaction takes in energy, therefore there is a temperature decrease in the surroundings.

Answer:

There is a temperature decrease in the surroundings

Explanation:

An endothermic reaction occurs when the energy used to break the bonds in the reactants is greater than the energy given out when bonds are formed in the products. This means that overall the reaction takes in energy, therefore there is a temperature decrease in the surroundings

Answer:

pOH = 8.02

Explanation:

Given:

[OH-] concentration for HNO3 solution = 9.50*10^-9 M

To determine:

pOH of the above solution

Explanation:

pOH of a given solution refers to the concentration of OH- ions i.e. the degree of basicity of that solution

[tex]pOH = -log[OH-]\\\\For\ the \ HNO3\ solution:\\\\pOH = -log(9.50*10^{-9}) = 8.02[/tex]

Answer: Water

Explanation: Water is an example of transparent because light can pass through it. Air is also an example.

Final answer:

A transparent object, such as a clean glass window, transmits light without significant absorption or reflection. The quality that makes an object transparent is its ability to let light pass through it effectively, as seen in high-quality diamonds, which refract white light and disperse it into its composite colors, causing a sparkling effect.

Explanation:

An object that is transparent allows light to pass through it without scattering, making it possible to see through the object clearly. A common everyday example of a transparent object is a clean glass window. Glass is transparent because it transmits light rather than absorbing or reflecting it, thus allowing a high proportion of the light spectrum to pass through without significant distortion.

The quality that makes an object transparent is its ability to transmit light waves effectively. When light encounters a transparent material, the photons that make up the light are not significantly absorbed by the material's atoms or reflected away, but rather they pass through the atomic structure of the material without being scattered.

A perfect example of this phenomenon is a high-quality diamond, which is clear and colorless, transmitting all visible wavelengths of light. The diamond sparkles with flashes of brilliant color when illuminated by white light because it refracts, or bends, the light, splitting it into its composite colors in a process similar to a prism. This is known as dispersion, which coupled with the internal reflections within the diamond due to its cut and high refractive index, causes the sparkle with various colors.

Final answer:

The percent composition of iron in FeCl3 is 34.43%.

Explanation:

The percent composition of iron in FeCl3 can be calculated by dividing the mass of iron by the molar mass of FeCl3 and multiplying by 100%. FeCl3 consists of one iron atom and three chlorine atoms. The atomic mass of iron is 55.845 g/mol and the atomic mass of chlorine is 35.453 g/mol. Therefore, the molar mass of FeCl3 is 55.845 g/mol + 3 * 35.453 g/mol = 162.204 g/mol. The mass of iron in FeCl3 is 55.845 g/mol / 162.204 g/mol * 100% = 34.43%.