Ethyne, commonly known as acetylene, is used as a fuel in cutting torches for welding and metalworking. As the torch operates, the ethyne undergoes combustion, as represented by the following equation. 2 C2H2(g) + 5 O2(g) - -> 4 CO2(g) + 2 H2O(g) Calculate the mass of ethyne required to heat 1.50 kg of water 20.0ºC to 42.9ºC.

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At standard pressure, a certain compound has a low boiling point and is insoluble in water. At STP, this compound most likely exists as(1) ionic crystals(2) metallic crystals(3) nonpolar molecules(4) polar molecules

Which sample of HCl(aq) contains the greatest number of moles of solute particles?(1) 1.0 L of 2.0 M HCl(aq)
(2) 2.0 L of 2.0 M HCl(aq)
(3) 3.0 L of 0.50 M HCl(aq)
(4) 4.0 L of 0.50 M HCl(aq)

Answers

The answer is (2) 2.0 L of 2.0 M HCl (aq). The number of moles of solute particles equals to the volume multiply the concentration of the solution. After the calculation, you can get the right answer.

Answer:

Explanation:

Water has a higher boiling point than expected because A. there is so much water vapor in the atmosphere. B. water molecules are not very massive. C. hydrogen and oxygen form single covalent bonds. D. of the strong attractions between polar water molecules

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The correct answer is C. Water has a higher boiling point than expected because hydrogen and oxygen form single covalent bonds. Molecules of water is bound together by strong attractions which needs high energy to break resulting to a higher boiling point of water than most substances.

Final answer:

Water has a higher boiling point than expected because D. of the strong attraction between polar water molecules.

Explanation:

The higher boiling point of water is due to the strong attraction between polar water molecules. Water molecules are polar because of the unequal distribution of electron density between the oxygen and hydrogen atoms, resulting in a slightly positive charge on the hydrogen atoms and a slightly negative charge on the oxygen atom.

Thus, these partial charges create attractive forces called hydrogen bonds between neighboring water molecules, making it difficult to separate the molecules and requiring more heat energy to overcome these attractive forces and reach the boiling point.

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15 The electronegativity difference between the atoms in a molecule of HCl can be used to determine(1) the entropy of the atoms(2) the atomic number of the atoms
(3) the first ionization energy of the atoms
(4) the polarity of the bond between the two atoms

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Answer : The correct option is, (4)

Explanation :

Electronegativity : It is a chemical property which measures the ability of an atom to attract an electrons towards itself.

Electronegativity difference : The difference in the electronegativity of the two atoms determines their polarity.

If the electronegativity difference between the two atoms is zero then the molecule is non-polar.

If the electronegativity difference between the two atoms is non-zero then the molecule is polar.

Therefore, the electronegativity difference between the atoms in a molecule of HCl can be used to determine the polarity of the bond between the two atoms

(4) the polarity of the bond between the two atoms

The more important the difference in electronegativity is, the more polarized the bond is.

What element used to be mined in the upper peninsula of Michigan

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coal, they use to mine for it alot

Final answer:

The Upper Peninsula of Michigan was widely known for iron mining. This region saw significant iron ore extraction, primarily in the Marquette Range, dating back to the 1800s. The mining and extraction process relied on iron smelting and made use of iron's magnetic properties.

Explanation:

The element that was extensively mined in the Upper Peninsula of Michigan is iron. This area, primarily in the Marquette Range, was a significant producer of iron ore, a key ingredient in the manufacturing of steel. The mining of iron in Michigan's upper peninsula started in the 1800s and, during its peak periods of the late 19th and early 20th centuries, the industry was critical to Michigan's economy.

Historically, iron ore was obtained through iron smelting, a process that involved heating and melting iron ore to extract pure iron. The iron was then used in various industries, primarily for the manufacturing of steel.

In extracting iron, magnetic properties of individual atoms were often considered due to iron's magnetic nature. Since iron ore is magnetically responsive, this property helped in the location and extraction of the ore. Furthermore, the delivery of the iron ore from the mines was influenced by the location of the mine, the concentration of the iron in the ore, and the difficulties associated with reducing the iron to its free metal form.

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How does the arrangement of the particles in a solid compare to that of a liquid? ( The arrangement of a solid's and a liquid's particles is the same.

The particles in a solid are farther apart than the particles in a liquid.

The particles in a solid are closer together than the particles in a liquid.

The arrangement of a solid's and a liquid's particles will depend on the mass of the substance.

Answers

The particles in a solid are closer together than the particles in a liquid.

The correct answer is C.

Is zinc coMpund Plz help me

Answers

Answer:

it is indeed a compound

Explanation:

Zinc is NOT a compound.

A compound contains two or more elements or molecules like H2O. Where H is 1 element and Oxygen is another and together they make a compound.

Zinc itself is a single molecule (or element) and can be used in a compound like ZnO (zinc oxide)

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