ΔH for the reaction IF5 (g) → IF3 (g) + F2 (g) is ________ kJ, give the data below. IF (g) + F2 (g) → IF3 (g) ΔH = -390 kJ IF (g) + 2F2 (g) → IF5 (g) ΔH = -745 kJ

Answer:

I am working on science rn 2

Answer:

that is the structure

Explanation:

that is the structure

The chemical structure of 2-(2-Bromophenyl)butane can be written as follows:

\(CH_3(CH_2)_3CH(PhBr)CH_3\)

The arrangement of atoms and chemical bonds of a molecule or compound is called its chemical structure. They provide a visual representation of a molecule's three-dimensional form, which is important for understanding its characteristics and behavior in chemical processes.

For example, the chemical structure of 2-(2-Bromophenyl)butane can be written as follows:

\(CH_3(CH_2)_3CH(PhBr)CH_3\)

Where,

Therefore, the chemical structure of 2-(2-Bromophenyl)butane can be written as follows:

\(CH_3(CH_2)_3CH(PhBr)CH_3\)

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Colloids are particles that measure between 1 and 1000 nanometers in size and scatter light. They are relatively stable particles that remain suspended in a solvent and do not settle over time.

Because of their small size, colloids have a large surface area, which is a key factor in their reactivity with ions, including cations.The attraction of ions towards a colloid surface is based on their size, charge, and concentration. The charge of a cation plays a vital role in the interaction of a colloid's surface. This is because a colloid's surface carries an opposite charge to that of the cation.

Small cations have a higher charge density than larger ones, which means they are attracted more strongly to colloid surfaces.The high charge density of small cations can interact with the colloid's surface at a closer range than large cations. Because of their size, large cations cannot come as close to the colloid's surface as small cations. Hence, small cations are attracted to colloid surfaces more strongly than large cations.As a result, smaller cations are more attracted to the surface of the colloids than larger ones. This suggests that the stability of colloidal systems is affected by the size of the cation involved.

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ionic solutions are good conductors of electricity. heterogeneous gaseous ionic covalent

Any sample of a solid, liquid, or gaseous mixture is said to be homogenous if the component ratios are constant. They are evenly dispersed in terms of their constituent parts, and the entire solution has a consistent look.

Components of a heterogeneous mixture have proportions that differ across the sample as a whole. In a heterogeneous mixture, the constituent parts may be seen and are not uniformly distributed. Any mixture with an uneven composition is referred to as a heterogeneous mixture. The components (sand and gravel) are clearly visible in a bucket but are not uniformly dispersed. That makes this a "heterogeneous blend."

___solutions are good conductors of electricity.

lonic

Covalent

Heterogeneous

Gaseous

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The way to find the moles of CO2 in a pop are:

A mole is a measure of molecules that is equal to approximately 6.022x10^23 molecules. Using the ideal gas formula, one can find the number of moles of carbon dioxide in a container if you know the other needed parameters and conditions.

Based on the above, it should be noted that P is the pressure, V is the volume from, T is the temperature and R is a proportionality constant that is equal to 0.0821 L atm / K mol.

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Answer:

Hydrogen is a substance because it has mass and combined with other molecules it can make another substance such as water.

Explanation:

Answer:

l guess c is the answer

Explanation:

it is true because in oxygen does not share any atoms with hydrogen

Answer:

A

Explanation:

taking test currently

Answer:

B.) Color of Flower

Explanation:

Took the test and got it right :)

It is likely that we would smell ammonia before we smell ethanol in this scenario. The correct option is (NH3).

Ammonia (NH3) has a lower molecular weight (17 g/mol) and a higher vapor pressure than ethanol (C2H6O, 46 g/mol), which means it will evaporate more easily and diffuse faster through the air.

Additionally, ammonia is highly soluble in water, which means it will quickly dissolve in any moisture in the air and become more concentrated, making it more likely to reach our noses.

In general, the speed at which a substance diffuses through air and reaches our nose (and thus our olfactory receptors) depends on a variety of factors, such as the volatility (vapor pressure) of the substance, its molecular weight, and its solubility in air.

However, it's important to note that individual sensitivity to smells can vary, and factors such as the distance between the person and the source of the odor, the concentration of the substances in the air, and the individual's olfactory threshold can all play a role in determining which odor is detected first.

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A diet low in sodium and favoring whole grains is called a heart-healthy diet.

A heart-healthy diet is one that is rich in nutrient-dense whole grains, lean proteins, and an abundance of fruits and vegetables. Foods that are high in salt, saturated fat, and added sugars should be avoided or limited as much as possible to minimize the risk of heart disease and stroke, which are the leading causes of death in the United States. In particular, consuming a low-sodium diet can help to lower blood pressure, reduce fluid buildup in the body, and decrease the risk of heart attack and stroke.

Additionally, eating whole grains has been shown to improve heart health by lowering cholesterol levels and reducing the risk of developing type 2 diabetes. Therefore, a heart-healthy diet is one that is low in salt, saturated fat, and added sugars, while being high in nutrient-dense whole grains, lean proteins, fruits, and vegetables.

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Explanation:

CH4 + 4S ---> CS2 + 2H2S

4) 0.75 mol S × (1 mol CS2/4 mol S) = 0.19 mol CS2

5) 3 mol H2S × (1 mol CH4/2 mol H2S) = 1.5 mol CH4

Fe2O3 + 2Al ---> 2Fe + Al2O3

6) 25 g FeO3 × (1 mol Fe2O3/159.69 g Fe2O3) = 0.16 mol Fe2O3

0.16 mol Fe2O3 × (2 mol Al/1 mol Fe2O3) = 0.32 mol Al

0.32 mol Al × (26.98 g Al/1 mol Al) = 8.6 g Al

7) Given:

45 g Al × (1 mol Al/26.98 g Al) = 1.6 mol Al

85 g Fe2O3 ×(1 mol Fe2O3/159.69 g Fe2O3)

= 0.53 mol Fe2O3

Let's look at how much Fe each reactant will produce:

1.6 mol Al × (2 mol Fe/2 mol Al) = 1.6 mol Fe

0.53 mol Fe2O3 × (2 mol Fe/1 mol Fe2O3) = 1.1 mol Fe

Note that the given amount of Fe2O3 will give us fewer Fe. Therefore, Fe2O3 is the limiting reactant.

8) Al will produce 1.6 mol Fe × (55.845 g Fe/1 mol Fe)

= 89 g Fe

Fe2O3 will produce 1.1 mol Fe × (55.845 Fr/1 mol Fe)

= 61 g Fe

9) Since Fe2O3 is the limiting reactant, the ideal yield of Fe for the reaction is 61 g. If the actual reaction only gave us 25 g Fe. then the percent yield of Fe is

%yield = (25 g Fe/61 g Fe) × 100% = 41%

10) If we only got 25 g Fe, then the amount of Al actually used in the reaction is

25 g Fe × (1 mol Fe/55.845 g Fe) = 0.45 mol Fe

0.45 mol Fe × (2 mol Al/2 mol Fe) = 0.45 mol Al

0.45 mol Al × (26.98 g Al/1 mol Al) = 12 g

Therefore, the leftover amount of Al is

25 g Al - 12 g Al = 13 g Al

Answer:

Dmitri Mendeleev

Explanation:

He was a Russian Scientist who decided to reorganize the periodic table after other notable scientists such as Antoine-Laurent Lavoisier had also tried to organize it based on the states of matter of the elements.

Mendeleev reorganized the period in the order of increasing atomic mass although there were some other modifications by modern scientists.

Answer:

13g

Explanation:

34+10+26=70

70-57=13

13g would complete the equation

Empirical formula units is 2 and the molecular formula is CxHyOz.

Molar mass-The molar mass of a chemical compound is determined by dividing its mass by the quantity of that compound, expressed as the number of moles in the sample, measured in moles. The molar mass of a substance is a bulk attribute rather than a molecular one.Calculate the molar mass of a substance by adding the molar masses of its constituent atoms.

There are 40.0 in 100 g of the unknown.

40.0⋅g/12.011⋅g⋅mol−1C

6.7⋅g/1.00794⋅g⋅mol−1 H and

53.5⋅g/16.00gmol−1  

We divide by to get C : H : O.

=3.33:6.65:3.34

. We get an empirical formula of C H 2 O by dividing each elemental ratio by the LOWEST number, which is close enough to WHOLE numbers.

Now the molecular formula is always a multiple of the empirical formula; i.e.

(EF)n=MF.

So 60.0⋅g.mol−1=n×(12.011+2×1.00794+16.00)g⋅mol−1.

Clearly n=2, and the molecular formula is×(CH2O) =CxHyOz.

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Answer:

86.91757 amu

Explanation:

From the question given above, the following data were obtained:

Isotope A (rubidium-85)

Mass of A = 84.91179 amu

Abundance of A = 72.17%

Atomic mass of rubidium = 85.47 amu

Isotope B (rubidium-87):

Abundance of B = 27.83%

Mass of B =?

The actual mass of rubidium-87 can be obtained as follow:

Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100]

85.47 = [(84.91179 × 72.17)/100] + [(Mass of B × 27.83)/100]

85.47 = 61.28084 + (Mass of B × 0.2783)

Collect like terms

85.47 – 61.28084 = Mass of B × 0.2783

24.18916 = Mass of B × 0.2783

Divide both side by 0.2783

Mass of B = 24.18916 / 0.2783

Mass of B = 86.91757 amu

Thus, the mass of rubidium-87 is 86.91757 amu

Answer: in the daytime the sun is out so the stars are not visible becuase the suns reflection! At night When you gaze at the constellations, every star produces an image that's the same size, but your retina isn't sensitive enough to respond to the outer parts of those images except for the brighter stars — which therefore look bigger than the fainter ones.

Explanation:

This is what I found on goog.le a while ago now it might actually help if I’m wrong I apologiz, I hope this was your quistion!

Answer:

70°C,130.9 ................,...

The different colors in Kaleidoscope Lane can be attributed to a mix of colorful objects, reflective surfaces, diverse light sources, and the interaction of colors, creating a visually captivating environment similar to the patterns seen in a kaleidoscope.

The different colors in Kaleidoscope Lane can be seen due to the combination of the following factors:
1. Colorful objects: The lane might be decorated with various colorful items like street art, murals, or decorations, which contribute to the vibrant colors seen in the area.
2. Reflection: A kaleidoscope is an optical instrument that uses mirrors to reflect light and create symmetrical patterns. In Kaleidoscope Lane, reflective surfaces or mirrored installations might be placed to bounce light off and create colorful patterns similar to those seen in a kaleidoscope.
3. Light sources: Different colored lights or filters might be installed in the lane to illuminate the surroundings, which results in a variety of colors being seen.
4. Interaction of colors: As light bounces off multiple surfaces and interacts with various colored objects in the lane, the colors blend and create new combinations, further contributing to the visual spectacle.

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The statement, "Specific volume is the term used to indicate the space a weight of gas will occupy," is true.

The specific volume is defined as the volume occupied by one unit mass of the substance. The volume per unit mass is referred to as the specific volume. It is denoted by the symbol "v".

It is the inverse of the density of the fluid (mass per unit volume) and is typically measured in units of cubic meters per kilogram (m3/kg) in the SI (metric) system, or cubic feet per pound (ft3/lb) in the English system.

The equation that is used to calculate the specific volume of the fluid is shown below:

specific volume (v) = volume (V) / mass (m) = 1/density (ρ)

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When a gas at a given temperature and pressure is changed, the new volume of the gas can be calculated using the ideal gas law.

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A chemical formula is a group of chemical symbols and numbers that express the elements and the number of atoms of each element that compose a compound.

A chemical formula of a compound offers information about the proportions of each chemical element in a given chemical compound or molecule.

The chemical formula of a compound can be written by including the chemical symbols of elements, numbers as subscripts, and symbols, such as plus (+) and minus (−) signs, dashes, commas, and brackets.

A chemical formula exhibits no words but simple chemical structures can be drawn but not full structures. Chemical formulae must be limited in power rather than chemical structural formulae.

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The meaning of the letters FT in the acronym FTIR is Fourier transform.  It is a mathematical model that aids in converting signals between two distinct domains.

Fourier Transform Infrared Spectroscopy or FTIR Analysis or FTIR spectroscopy is a method used to distinguish between organic, polymeric, and, occasionally, inorganic materials. This method test materials and examines chemical characteristics using infrared light.

A sample is exposed to infrared light from the FTIR instrument that ranges in wavelength from 10,000 to 100 cm⁻¹. Some of the light is absorbed and part of which passes through the sample. The sample molecules then transform the absorbed light radiation into rotational and/or vibrational energy. The resulting signal at the detector appears as a spectrum.

Therefore, the FT in FTIR is referred to as Fourier transform.

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Answer

To answer this question we need to use the following equation

P1/T1 = P2/T2

We can rearrange to make T1 subject of the formula as shown

T1 = (P1 x T2)/ P2

= (3.40 x 340)/ 5.90

= 195.9 K

Answer:

By placing the steel wool in a jar with plenty of oxygen and water, you start a chemical reaction. The iron and the oxygen react to form a new reddish-brown substance, called iron oxide or rust. In this experiment, the water level in the glass should rise as the oxygen inside combines with the iron in the steel wool.

Explanation:

Sodium from Na3PO4(aq) could be prepared by electrolysis of the aqueous solution shown. Based on the provided options, the element that could be prepared by electrolysis of the aqueous solution shown

Potassium from KCl(aq)
Here's why:
- Sodium from Na3PO4(aq) and Nitrogen from AgNO3(aq) are not possible because these ions are more stable in solution than undergoing electrolysis.
- Sulfur from K2S04(ed) is not valid as the compound should be K2SO4(aq) and even then, it would produce oxygen at the anode instead of sulfur.
- Oxygen from H2SO4(aq) can be prepared through electrolysis, but this is not an element directly obtained from the compound.
Potassium from KCl(aq) can be prepared by electrolysis. During this process, K+ ions are reduced to potassium metal at the cathode, and Cl- ions are oxidized to chlorine gas at the anode.

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suppose mol of electrons must be transported from one side of an electrochemical cell to another in minutes. the size of electric current that must flow is   104.54 A.

Suppose 650 mmol of electrons must be transported from one side of an electro chemical cell to another in 10.0 minutes Then, we have to calculate the size of electric current that must flow. Then we know that Current I = Charge(q) / time(t), Charge = mols of e-x charge of electron = (0.650 mol of e-) x (96500 C/mol of e-) = 62725 C. now, time in seconds t = 10 min = 10 min x 60 s/ min = 600 s therefore, I = C/t = (62725)/600

| = 104.54 C/s, Also, 1 C/s = 1 Amp. Hence, I = 104.54 A. A torrent of particles, such as ions or electrons travelling through an electrically conducting or a vacuum is called as an electric current. The net rate of electric charge passing throughout a surface or through a control volume is how it is determined. Electric current is a term that refers to how so much electricity to flow across a circuit and how it flows in an electronic circuit. Amperes are employed to measure it (A). More and more electricity going through the circuit, the greater the ampere value.

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To neutralize 35.00 mL of 0.0500 M nitric acid, 43.75 mL of 0.0200 M calcium hydroxide would be needed.

The Mole Ratio, which is obtained from the coefficients of the compounds in a balanced equation, is a conversion factor between compounds in a chemical process. So, in a chemical process, the mole ratio is employed to convert between quantities of substances.

From the equation of the reaction:

\($\mathrm{Ca}(\mathrm{OH})_2+2 \mathrm{HNO}_3\rightarrow\mathrm{Ca}\left(\mathrm{NO}_3\right)_2+2 \mathrm{H}_2 \mathrm{O}$\)

The mole ratio of calcium hydroxide to nitric acid is 1 : 2.

Mole of nitric acid = molarity × volume

substitute the values in the above equation, we get

= 0.0500 × 35.00/1000

simplifying the equation, we get

= 0.00175

The mole of the calcium hydroxide can be calculated as:

0.00175/2 = 0.000875

Volume of calcium hydroxide = mole/molarity

substitute the values in the above equation, we get

= 0.000875/0.0200

simplifying the equation, we get

= 0.04375 L

= 43.75 mL

Therefore, the correct answer is 43.75 mL.

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The number of carbon atoms at STP is  1.47 x 10²³ atoms

STP stands for standard temperature and pressure. STP refers to a specific pressure and temperature used to report on the properties of matter.

According to IUPAC( International Union of Pure and Applied Chemistry), it is defined as -

It is generally needed to test and compare physical and chemical processes where temperature and pressure plays an important role as they keep on varying from one place to another.

One mole of a gas under STP conditions occupies a volume of 22.4L.

Given,

Volume of CO₂ = 5.50 L

number of moles of CO₂ = 5.5 ÷ 22.4

                                        = 0.245 moles

We know that,

                     1 mole = 6.023 x 10²³ atoms

So, 0.245 moles will have 6.023 x 10²³ × 0.245 atoms

                            =  1.47 x 10²³ atoms

Therefore, the number of carbon atoms at STP is  1.47 x 10²³ atoms

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