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cluponka [151]
3 years ago
14

Which of the following statements is the most accurate? A. Energy transfers are never 100% efficient. B. Energy transfer is comp

letely efficient. C. Energy cannot be transferred to other forms. D. Energy transfers can be used to create perpetual-motion machines.
Chemistry
2 answers:
qaws [65]3 years ago
6 0
I'd say it's A because while the energy cannot be lost, it can not be 100% efficient because if it was we wouldn't have to worry about energy.
Olegator [25]3 years ago
5 0

Answer:

A. Energy transfers are never 100% efficient

Explanation:

According to the  first law of thermodynamics energy can neither be created nor destroyed but it can be converted from one form to another. According to the second law of thermodynamics transfer of energy is never 100% efficient in a machine. There is always loss of energy due to wear and tear of the machinery.

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Which statement accurately describes the energy of a block of ice?
larisa86 [58]

Answer:

The kinetic energy of the ice is found in the vibration of the molecules.

Explanation:

The energy of motion is called kinetic energy. Anything that is moving has kinetic energy, including the atoms and molecules vibrating in a substance.

hope I'm not wrong!

4 0
3 years ago
Draw a structure showing an aromatic resonance form. Include formal charges and lone pair electrons on the oxygen atom.
ryzh [129]

Answer:

answer is attached

Explanation:

Benzene is a common organic solvent that was previously used in gasoline; it is no longer used for this purpose, however, because it is now known to be a carcinogen. The benzene molecule (C6H6C6H6) consists of a regular hexagon of carbon atoms, each of which is also bonded to a hydrogen atom. Use resonance structures to describe the bonding in benzene.

Given: molecular formula and molecular geometry

Asked for: resonance structures

Strategy:

Draw a structure for benzene illustrating the bonded atoms. Then calculate the number of valence electrons used in this drawing.

Subtract this number from the total number of valence electrons in benzene and then locate the remaining electrons such that each atom in the structure reaches an octet.

Draw the resonance structures for benzene.

Solution:

A Each hydrogen atom contributes 1 valence electron, and each carbon atom contributes 4 valence electrons, for a total of (6 × 1) + (6 × 4) = 30 valence electrons. If we place a single bonding electron pair between each pair of carbon atoms and between each carbon and a hydrogen atom, we obtain the following:

Each carbon atom in this structure has only 6 electrons and has a formal charge of +1, but we have used only 24 of the 30 valence electrons.

B If the 6 remaining electrons are uniformly distributed pairwise on alternate carbon atoms, we obtain the following:

Three carbon atoms now have an octet configuration and a formal charge of −1, while three carbon atoms have only 6 electrons and a formal charge of +1. We can convert each lone pair to a bonding electron pair, which gives each atom an octet of electrons and a formal charge of 0, by making three C=C double bonds.

C There are, however, two ways to do this:

Each structure has alternating double and single bonds, but experimentation shows that each carbon–carbon bond in benzene is identical, with bond lengths (139.9 pm) intermediate between those typically found for a C–C single bond (154 pm) and a C=C double bond (134 pm). We can describe the bonding in benzene using the two resonance structures, but the actual electronic structure is an average of the two. The existence of multiple resonance structures for aromatic hydrocarbons like benzene is often indicated by drawing either a circle or dashed lines inside the hexagon:

7 0
3 years ago
How many moles of water are needed to produce 56.8 g C2H2?
ANTONII [103]
Vc BFF CFC. They. We’d 577755345
4 0
2 years ago
Which of the following cannot be classified as a mixture? *
Nataly_w [17]

Answer:

Gold

Explanation:

I think its gold since its a pure element, hope it helped

6 0
2 years ago
Some enzymes have one or more sulfhydryl (thiol) groups that are important to enzymatic activity but that can react upon standin
Jlenok [28]

Answer:

A. Protein disulfide is oxidized.

Explanation:

When thiol reagents are introduced with some protein solutions they react with molecules of disulfide and oxidize the protein. There occurs inter-conversion of thiol molecules into free disulfide molecules. The DTT reduces the disulfide molecules bonds of proteins and it starts to peptide.

3 0
3 years ago
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