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3 years ago

Please help me with this one true or false

Chemistry

1 answer:

zhenek [66]3 years ago

3 0

Answer:

41. False

42. True

43. False

44. False

45. True

46 - 48. Unsure (I don't take Biology, sorry.)

Explanation:

41.

FeS and HCl are the reactants of the chemical equation. Hence, false.

42.

It is common knowledge that HCl and H₂SO₄ are acids. Hence, true.

43.

Vinegar contains acetic acid CH₃COOH, which isn't a base. Hence, false.

44.

Fluorescence is actually the emittance of light by <em>any substance</em> due to radiation. Hence, false.

45.

Yes, the image produced by a plane mirror is laterally inverted. Hence, true.

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What is the mole of 125 mg of Na? How many Na atoms?

Crank

(125 mg Na) x (1 g/1000mg) x (1 mol of Na/22.99 g) = 5.43 E -3 mols of Na

5.43 E -3 mols x 6.022 E 23 = 3.27 E 21 Na atoms

7 0

3 years ago

* Who can help with this lol *

Viktor [21]

Answer: subduction and sea floor spreading

Explanation:

He knew that the continents today were once joined together by fossil records of plants and animals that were found to be on continents far removed from each other. He knew this also by corresponding land forms that matches up as well. What he couldn’t prove is how the land masses would have moved so far away from each other. Subduction and sea floor spreading move the tectonic plates that the continents sit on. That’s what he was missing.

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3 years ago

Describe the Self-Consistent Field (SCF) method for obtaining the orbitals of a Boron atom

weqwewe [10]

<h3>What is Self-Consistent Field (SCF)?</h3>

This is used in quantum chemical models to accurately calculate the amount

of orbitals present in an element.

The Self-Consistent Field (SCF) method for obtaining the orbitals of a

Boron atom involves the following processes which include:

Selecting an approximate Hamiltonian

Solving the Schrödinger equation to obtain a more accurate set of orbitals.
Solving the Schrödinger equation again until the results converge.

The converging of the result typically signified the end of the solving of the

equations and the derivation of the orbitals of the Boron atom.

Read more about Orbitals here brainly.com/question/26000020

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3 years ago

what noble gas electron configuration is achieved by the bromine atoms in a molecule of BR2, a diatomic element?

KonstantinChe [14]

Answer:

answer: Krypton

Explanation:

In bromine molecule bromine atom achieved Krypton electron configuration because before forming bromine molecule it had only 35 electron but after formaion molecule one elctron is shared by other bromine atom and after that bromine has 36 elecron which resembles with Krypton atomic number hence electronic configuration also achieved is same as Krypton.

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4 years ago

Which element or compound has lost electrons in this oxidation-reduction reaction? 4li 2coo â†’ 2co 2li2o a. coo b. li2o c. li d

Nady [450]

Answer:

Correct option is C.

Explanation:

Such type of chemical reaction that involves a transfer of electrons between two species is known as oxidation-reduction or redox reaction.

Redox reaction is oxidation number of a molecule, atom, or ion changes by gaining or losing an electron.

For this reaction:

On reactant side:

Oxidation state of oxygen, cobalt, lithium = -2 ,+2, 0

While on product side of reaction:

Oxidation state of cobalt, oxygen, lithium = 0, -2, +1

Here, oxidation reaction take place because oxidation state of lithium is increased. While the oxidation state of cobalt in reducing, it is gaining electrons and so it undergoes reduction reaction.

So, Option C (Li) is correct.

Learn more about oxidation-reduction reaction:

brainly.com/question/13293425

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2 years ago