Warm fronts are shown on weather maps as a line with blue triangles. *
A. True
B. False

Since the heat of solution of KI is 20.3 kJ/mol, the answer to the question is a. Exothermic, ΔH is positive

There are two types of chemical reactions namely exothermic and endothermic reaction.

Given the heat of solution of KI as 20.3 kJ/mol.

Since it is positive, the reaction is exothermic and  ΔH is positive

Since the heat of solution of KI is 20.3 kJ/mol, the answer to the question is a. Exothermic, ΔH is positive

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Answer:

I'm assuming atmospheric pressure, since it says she is measuring pressure exerted my atmospheric gases

Solute

The salt being dissolved is the solute.

Positive ions are formed by atoms or molecules suffering an inelastic collision with an energetic electron in which an electron is lost from the atom or molecule (electron impact ionization). The degree of ionization of the plasma depends strongly on the electron density and energy distribution in the gas.

Answer:

I don't do chemistry

Explanation:

sorry

Answer:

ok ok ok ok ok ok ok ok ok ok ok ok ok ikjk

o

Explanation:

fgghhh

Well, each ml of water requires one calorie to go up 1 degree Celsius, so this liter of water takes 1000 calories to go up 1 degree Celsius. (There are 1000 ml, each of which needs to have its temperature raised.)

Answer: H2SO4 + 2NaOH = Na2SO4 2H2O

Explanation: The ChemicalAid website is very helpful if you need to balance chemical equations.

Answer:After the hydrogen in the star's core is exhausted, the star can fuse helium to form progressively heavier elements, carbon and oxygen and so on, until iron and nickel are formed. ... Supernova explosions result when the cores of massive stars have exhausted their fuel supplies and burned everything into iron and nickel.

Answer:  Detailed problem with lots of assumptions.  Please see below.  Percent yield is 100% (!?, so check my work).

Explanation:

Some information is missing from the problem statement.  I'll make some assumptions to solve the problem, so this answer depends on those assumptions.

"Calcium carbobnate" is CaCO3, not CaCO, which is obtained by calcining (heating) CaCO3:

  CaCO3 = CaO + CO2

The CaO can then be reacted with SO2 to form calcium sulfate, CaSO4 (not CaSO, as per the following balanced equation:

2CaO + 2SO2 + O2 = CaSO4

[Note:  It also reacts with any SO3 molecules bouncing around, as does happen in flue gases to also form CaSO4]

The following assumes we have 255 grams of CaCO3, not CAC, whatever that stands for.

We have 135g of SO2, not SO.

This also assumes that it is CaSO4 that is produced (not CaSO), 198 grams.

Since is a two step reaction sequence, we need to first calculate the moles of Ca) produced from the CaCO3.  It is a 1:1 molar ratio, and we have (255g/100.1g/mole) = 2.548 moles of CaCO3.  This will produce 2.548 moles of CaO, for use in the second reaction.

2CaO + 2SO2 + O2 = 2CaSO4

This tells us we'll produce 1 mole of CaSO4 for every 2 moles of CaO, a 1:2 ratio.  It also states that 2 moles of SO2 are consumed for every 2 moles CaO, a 1:1 ratio.

We have 2.548 moles of CaO, so would need the same moles of SO2 to fully react.  However, we only have (135g/64.1 g/mole) = 2.107 moles of SO2.  The SO2 will be the limiting reagent, so the theorectical yield will be based on this reactant, which will consume 2.107 moles of CaO, leaving 0.44 moles (24.7 g) of CaO behind.

The balanced equation tells us that 2.107 moles of CaO should produce 2.107 moles of CaSO4, which is (2.107moles)*(136.1 g/mole) = 198 grams of CaSO4.  We actually got 198 grams, so the yield is 100%  [Nice work].

Answer:  K only has 1 valence electron.  It will leave with only a little effort, leaving behind a positively charged K^+1 atom.

Explanation:  A neutral potassium atom has 19 total electrons.  But only 1 of them is in potassium's valence shell.  Valence shell means the outermost s and p orbitals.  Potasium's electron configuration is 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1.  The 4s orbital is the only orbital in the 4th energy level.  So it has a valency of 1.  This means this electron will be the most likely to leave, since it is the lone electron in the oyutermost energy level (4).  When that electron leaves, the charge on the atom go up by 1.  The atom now has a full valence shell of 3s^2 3p^6, the same as argon, Ar.

Answer:

Weak; a lot of potential energy.

Explanation:

Carbon-carbon covalent bonds, such as the ones in carbohydrates and lipids, are weak and have potential energy.

In chemistry, a covalent bond is a chemical connection between two ions or atoms in which their respective electron pairs are shared. A molecular bond is another name for a covalent link.

Several other chemical species, including radicals and macromolecules, may also include this kind of connection. Irving Langmuir invented the term "covalence" around 1919 to characterize the quantity of electron pairs exchanged by nearby atoms, but the phrase "covalent bond" wasn't used until 1939. Carbon-carbon covalent bonds, such as the ones in carbohydrates and lipids, are weak and have potential energy.

Therefore, carbon-carbon covalent bonds, such as the ones in carbohydrates and lipids, are weak and have potential energy.

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3 moles of hydrogen gas (H2) will be produced If sufficient hydrochloric acid is used to react completely with 72.9 g of magnesium.

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Answer:

In metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize. That is to say, instead of orbiting their respective metal atoms, they form a “sea” of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions.

Answer:

A solid's particles fit closely together. The forces between the particles are so strong that the particles can not move freely; they can only vibrate. This causes a solid to be a stable, non-compressible shape with a definite volume.

Explanation:

I honestly don't know if that's right...

Answer:

Both Magnesium and aluminium rods are metals, hence they allow flow of charged electrons due to high drift velocity.

Explanation:

• An electric conductor is material which allows flow of electric current.

[tex].[/tex]

The Magnesium (Z = 12) is an alkaline earth metal and the Aluminium (Z = 13) is a metal in the Boron Group. One characteristic of the metals is that they have facility to lose electrons, wich means facility to conduct electricity.

Moreover, the metals are ductile, so it is easy to turn them into wires. For example, the light poles has wires made by copper because the copper is another metal, so its have the same properties as indicated above.

I hope I've helped. =D

Enjoy your studies! \o/

Explanation:

It's none of these.

Cr- 1s2 2s2 2p6 3s2 3p6 4s1 3d5

Mg- 1s2 2s2 2p6 3s2

Mn - 1s2 2s2 2p6 3s2 3p6 4s2 3d5

Fe- 1s2 2s2 2p6 3s2 3p6 4s2 3d6

I think there's a mistake in the question.

Answer:

e

Explanation:

wavelength = speed of light/frequency

wavelength = 3 x 10^8/2.17 x 10^11

wavelength = 1.38x10^-3m

According to the concept of solubility, thing which dissolves is solute and in which it is dissolved is solvent , hence juice crystals are solute and water is solvent.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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Answer:

iron + oxygen → iron oxide. 4 Fe + 3 O2 → 2 Fe2O.

Answer:

[tex]2.10 - 6 \: c q2 = 4.10 - 6.c[/tex]

Answer:

cold

Explanation:

Weather is created by the movement and interaction of air masses of different temperatures. ... Air masses are commonly classified according to four basic source regions with respect to latitude. These are Polar (cold), Arctic (very cold).

Answer:

Uranus

Explanation: Earth's distance from the Sun is about 150 million kilometers. Dividing Earth's distance to sun with the Uranus' distance to the Sun will give us the quotient of 20. Hence, Uranus is the planet that is 20 times farther from the Sun than the Earth is.

Answer:

One mol of NaCl (6.02 x1023 formulas) has a mass of 58.44 g.

The number of moles of sodium chloride in a 321.8 g sample is 5.5 moles. Details about number of moles can be found below.

The number of moles of a substance in a particular mass of that compound can be calculated as follows:

no of moles = mass ÷ molar mass

molar mass of NaCl = 58.5g/mol

No of moles of sodium chloride = 321.8g ÷ 58.5g/mol

no of moles = 5.5 moles

Therefore, the number of moles of sodium chloride in a 321.8 g sample is 5.5 moles.

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The percentage of an iodine-131 sample that will remain after 40.20 days is 3.125%

Half-life (t½) = 8.040 days.

Time (t) = 40.20 days

[tex]n = \frac{t}{t_{1/2}} \\\\n = \frac{40.20}{8.040}\\\\[/tex]

Thus, 5 half-lives has elapsed.

Number of half-lives (n) = 5

[tex]N = \frac{1}{2^{n} } * N_{0} \\\\N = \frac{1}{2^{5} } * N_{0} \\\\N = \frac{1}{32} * N_{0}\\\\[/tex]

Divide both side by N₀

[tex]\frac{N}{N_{0}} = \frac{1}{32} \\\\\frac{N}{N_{0}} = 0.03125\\\\[/tex]

Multiply by 100 to express in percent

[tex]\frac{N}{N_{0}} =[/tex] 0.0312 × 100

Therefore, the percentage of an iodine-131 sample that remains is 3.125%

[tex]\frac{N}{N_{0}}[/tex] => Fraction remaining

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Answer:

yes

Explanation:

yes I am genius yygggh