The right response is E none of these since () is a .
:
are typically powerful and hard substances. These metals have high melting and boiling points. The family of includes strong, malleable substances that may be hammered, twisted, and pulled into wires. They are also efficient in carrying heat and electricity. Atoms in these metals are attracted to one another strongly. Usually, they are shiny as well.
is a chemical element with the atomic number 24 and the letter Cr. It is the first component in group 6. It belongs to the transition metal family and is brittle, tough, glossy, and steely-grey in color.
The great corrosion resistance and hardness of metal make it valuable.
The discovery that steel could be rendered extremely resistant to corrosion and discoloration by adding metallic to make stainless steel was a significant advancement in the production of steel.
85% of commercial use is made up of stainless steel with chrome plating (electroplating with chromium).
is highly prized for its ability to be finely polished while remaining tarnish-resistant.
Nearly 70% of the visible spectrum and approximately 90% of infrared light are reflected by polished chromium.
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Which of the following solutions will have higher freezing point depression and why ?
0.1 m NaCl and 0.05 m Al_2(SO_4)_3
O.1M of NaCl solution will have a higher freezing point depression because it contains more particles.
What is freezing point depression?Freezing point depression is the difference in the freezing points of the solution from the pure solvent.
It can be said that for any solute added to a solvent; the freezing point of the solution will be lower than the freezing point of the pure solvent (without the solute).
The freezing point depression due to the presence of a solute is also a colligative property i.e. the amount of change in the freezing point is related to the number of particles of solute in a solution.
Therefore, 0.1M of NaCl solution will have a higher freezing point depression.
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which of the following is true? group of answer choices the melting point of graphite is highest at a pressure of about 70 kbar 10 km underground, carbon is more stable as diamond than as graphite. the entropy of graphite is smaller than that of diamond
Graphite has a higher entropy than diamond, which is again a result of the dense crystal lattice of diamond. In comparison to the graphite structure, it is far more organized.
What Is graphite higher than diamond?The presence of carbon in both diamond and graphite is another fact that is widely known. Because each of the carbon atoms in diamond forms four covalent bonds to form a tetrahedral structure, as well as because strong covalent bonds are present in it, diamond is harder than graphite.Diamonds are bright and translucent, while graphite is opaque and has an earthy to metallic appearance. Their hardness is another notable physical distinction. The relative Mohs Hardness Scale, which ranges from 1 (softest) to 10 (hardest), is used to compare the hardness of minerals (hardest).To Learn more About Graphite refer To:
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why does i2 have a higher boiling point than f2
Iodine molecules will be forced to cling together by this force since it is so powerful. The iodine molecule is therefore extremely tough to break. Iodine has a higher boiling point as fluorine as a result.
What exactly is boiling point?
The temperature when a liquid's vapor pressure equals that tension of the gas below it is known as the boils point of the liquid. The degree at which a liquid's vapor pressure equals one atmosphere is called the liquid's typical boiling point (760 torr). The view from a distance. view from a distance of a bubbles in boiling water.
High boiling point: What does that mean?
It measures the point where a chemical boils, to put it simply. A higher the boiling point denotes stronger intermolecular forces, similar to the melting point.
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directions: each set of lettered choices below refers to the numbered statements immediately following it. select the one lettered choice that best fits each statement. a choice may be used once, more than once, or not at all in each set. (a) cs (b) ag (c) pb (d) br (e) se question has the lowest first-ionization energy
Cs has the lowest first-ionization energy.
What is first-ionization energy?
In order to create one mole of gaseous ions with a charge of 1+ from one mole of neutral gaseous atoms, the first ionization energy must be used to remove the most loosely held electron. In terms of symbols, this is simpler to understand. It is the amount of energy required to make this transformation for each mole of X.
What is Ionization energy?
The ionization energy assesses an element's capacity to engage in chemical reactions that require the donation of electrons or the production of ions. It frequently has to do with the kind of chemical bonds that are formed between the constituents of the compounds that they produce. See also electron affinity and binding energy.
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plutonium-236 is an alpha emitter with a half-life of 2.86 years. if a sample initially contains 1.35 mg of pu-236, how long will it take for the sample to decay to 0.100 mg?
Time it will it take for the sample to decay to 0.100 mg is 23.39 years.
The time can be calculated by the formula is given as :
T = (t)^n
t = half life = 2.86 years
n = no. of the half time
no. of half lives sample
1.35 0.67
0.67 0.33
0.33 0.16
T = (t)^n
= ( 2.86 ) ^ 3
= 23.39 years
Thus, plutonium-236 is an alpha emitter with a half-life of 2.86 years. if a sample initially contains 1.35 mg of pu-236, it take for the sample to decay to 0.100 mg is 23.39 years.
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predict the organic product formed when the compound shown below undergoes a reaction with nacn.
the organic product that will result from the interaction of the below-listed chemical with NaCN.
An organic product is developed from components obtained through organic farming. Organic food is the most popular organic product, however, organic agriculture can also be used to produce apparel and personal care products.
To prevent customers from consuming dangerous items, many nations have rigorous consumer safety legislation. These organizations frequently certify agricultural products as organic. The National Organic Program of the USDA certifies products as organic in the US. Several requirements must be completed, according to the USDA, for a product to be deemed organic. Synthetic and non-synthetic compounds that may be used in the production of organic products are included on the National List of Allowed and Prohibited Substances. Operations using these organic goods must be "conserving and protecting natural resources.
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The most common charge associated with scandium in its compounds is $3+.$ Indicate the chemical formulas you would expect for compounds formed between scandium and (a) iodine, ( b) sulfur, (c) nitrogen.
Iodine and scandium have charges of -1 and +3 respectively in their compounds, while sulfur and nitrogen have charges of -2 and -3. Hence ScI3, Sc2S3, and ScN would make up the compound's formula.
The lanthanide iodide scandium triiodide, also known as scandium iodide, is an inorganic chemical having the formula ScI3. As a semiconducting component in epitaxial metal/semiconductor superlattices, the rocksalt-structure semiconductor scandium nitride (ScN) has drawn interest for its possible use in thermoelectric energy conversion devices. With the chemical formula Sc2S3, scandium(III) sulphide is a combination of scandium and sulfur. It's a solid yellow color. Sc3+ and S2 ions from scandium make to the compound Sc2S3. An ionic compound is a thing formed of ions in an ionic connection.
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given that the delta g value for a particular reaction is negative what can be said about relative portions of reactants and products when the reaction reaches equilibrium
When delta G value for a particular reaction is negative, then we can say that : there are fewer reactant molecules and then product molecules.
What is the characteristic of reaction if Delta G is negative?A negative ∆G means that reactants have more free energy than the products. Exergonic reactions are also called spontaneous reactions, as they can occur without addition of energy.
When used in a reaction, delta G is the difference in free energy between products and reactants. If this value is negative, then the reaction is spontaneous and if it is positive, then the reaction is non-spontaneous. If it is zero, then the reaction is at equilibrium.
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Round 0.02056 to three significant figures. O 0.0205 O 0.0206 O 0.021 O 0.020
On rounding of the number 0.02056 to three significant figures we get 0.021.
The significant figures are the digits that are used to represent the accuracy of a particular number or value.
Rounding off is a procedure in which a complex value is made simple by keeping it close to the very next number which is more convenient to deal with.
In the given number 0.02056. We have to round of this number to 3 significant figures.
We can observe that the digit 6 is greater than 5 so we can add one to the successive digit, so the number will become 0.0206.
But it has to be noted that we have to round of the number to three significant figures.
So, again rounding off the number 6. So finally after rounding of two three significant figures are number becomes 0.021.
As we can see that this number contains three digits after the decimal so it has three significant figures.
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Can anybody help me with this?
The correct order of the given elements above in their increasing atomic radii are as follows:
Phosphorus CobaltRutheniumOsmiumGalliumWhat is meant by the atomic radius of an element?The atomic radius of an element is one periodic properties of elements which describes the total distance between the center of the nucleus of an element to the outermost shell of an electron.
From the task given above, the atomic radii values of the elements in the problem above are: Phosphorus ( 98pm ), Cobalt ( 152pm ), Ruthenium ( 178pm ), Osmium ( 185pm ) and finally Gallium which is 187pm.
That being said, below are some few examples of periodicities which is seen in elements in the periodic table:
Melting and boiling pointIonization energyElectron affinityElectronegativityElectrical and thermal conductivityIonic sizeIonic radiusIn conclusion, the atomic radius and atomic size are both periodic properties of elements.
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suppose that daniel has a 2.50 l bottle that contains a mixture of o2 , n2 , and co2 under a total pressure of 4.80 atm. he knows that the mixture contains 0.230 mol n2 and that the partial pressure of co2 is 0.250 atm. if the temperature is 273 k, what is the partial pressure of o2 ?
If the mixture contains 0.230 mole N₂ and that the partial pressure of CO₂
is 0.250 atm and if the temperature is 273 k, the partial pressure of O₂ should 2.67 atm.
First we have to find the number of mole of CO₂ :
P = 0.25atm
V = 2.5L
T = 273K
So, find number of moles using:
PV = nRT
0.25 atm × 2.5 L = n × 0.08206 atm.L/ K × 273 K
n = 0.0279 mole
Now, the total mole of gas :
P = 4.8 atm
V = 2.5L
T = 273K
find number of moles using :
PV = nRT
4.8 atm × 2.5 L = n × 0.08206 atm.L/ K × 273 K
n = 0.5357 mole
Now, find mole of O₂ :
mole of O₂ = total mole - mole of CO₂ - mole of N₂
mole of O₂ = 0.5357 - 0.0279 - 0.21
Mole of O₂ = 0.2978 mole
finally, find pressure of O₂ :
V = 2.5 L
n = 0.2978 mole
T = 273K
PV = nRT
P × 2.5 L = 0.2978 × 0.08206 atm.L/ K × 273 K
P = 2.67 atm
So, the partial pressure of O₂ is 2.67 atm.
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A. lithium and fluorine
Chemical formula: ______
Complete the valence molecular-orbital diagram for oxygen, 02- 2p Answer Bank 2s 2s
The bonding molecular orbitals are of lower energy. So, they are first to fill up. The antibonding orbitals are of higher energy than bonding orbitals.
According to molecular orbital theory molecular orbitals of a molecule is formed by combination of its atomic orbitals and electrons present in molecule are distributed among the molecular orbitals.
The total number of electrons present in O2 molecule are 16. Thus, the electronic configuration for combination of two atomic orbitals of oxygen is as follows.
Here sigma and pi orbitals are called bonding molecular orbitals. The sigma star and pi star are called antibonding orbitals.
The electronic configuration is the distribution of a molecule in molecular orbitals. Total number of electrons present in molecule is 16. Thus, 16 electrons are filled in its molecular orbitals.
In orbital, the valence orbitals are 2s and 2p and total number of electrons in these orbitals are 12. Thus, Construct valence molecular orbital diagram and fill 12 electrons as attached.
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this reaction makes potassium superoxide useful in a self-contained breathing apparatus. how much o2 could be produced from 2.41 g of ko2 and 4.58 g of co2?
The mass of oxygen in grams is 0.704 grams for the could be produced from 2.41 g of ko2 and 4.58 g of co2.
We want to transform the whole lot into moles. The molar masses, in g/mole:
KO2 71.1CO2 44.0O2 32Moles KO2 = 2.41g/(71.1g/mole) = 0.03 molesMoles CO2 = 4.58g/(44g/mole) = 0. 10 moles4KO2 + 2CO2 —> 2K2CO3 + 3O2The response calls for two times as many moles of KO2 than moles of CO2. That way 0.10 mole of CO2 might devour 0.20 moles of KO2. But we best have 0.03 moles of KO2, so the restricting reagent is KO2. There are three moles of O2 produced for each 2 moles of CO2 consumed. In this example we will expect all the KO2 reacts, in order that must end result in (3/4) * (0.02 moles) = 0.022 moles of O2.To get the mass, 0.022 mole * (32g/mole) = 0.704 grams O2So the O2 produces qre 0.704 grams of oxygen produced.Read more about oxygen;
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The vapor pressure of 1-propanol is 10.0 torr at 14.7 %C. Calculate the vapor pressure at 52.8 'C_ Given: Heat of vaporization of 1-propanol = 47.2 kJlmol. (Chapter 11)
The pressure that is applied to the walls of a sealed container when a chemical inside of it evaporates is known as vapor pressure in chemistry.
Use the Clausius-Clapeyron equation to get the vapor pressure at a specific temperature:
Propanone's vapour pressure is computed and expressed in degrees Celsius. When the rate of vapor is estimated using propanone at 50°C, the end result is a 78° vapour pressure. As a result, the vapor pressure is 78°.
Calculating pressure involves dividing the force by the area. or pressure force area Text pressure equals force times area, sometimes known as , or pressure equals areaforce.
At 25 °C, the vapor pressure of water is 0.0313 atm, or 23.8 mm of mercury.
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explain why you would expect the molar heat capacity at constant pressure of an ideal gas to be larger than the molar heat capacity at constant volume.
The thermal capacity under a certain pressure Since the substance expands and produces energy when heat is applied at a constant pressure, CP is greater than the heat capacity at constant volume CV.
Why does the first law of thermodynamics demonstrate that CP Cv R and that specific heat at constant pressure is greater than that at constant volume?In the first instance, the temperature of the gas must be raised with greater heat. Since it requires more energy to raise the temperature by one unit in the former situation, CP, or specific heat at constant pressure, is greater than CV, or specific heat at constant volume.
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