The particles that are lost, gained, or shared in chemical reactions are

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Answer 1

Answer: Electrons are either lost gained or shared in chemical reactions :)

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Which of the following items represents a chemical change? burning melting evaporation freezing The physical properties of a compound are similar to those of its elements. a. True b. False
A medium-temperature star like the Sun would most likely emit its most intense radiation as _____. A. Ultraviolet light B. Visible light C. Microwaves D. Radio waves
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A stream of negatively charged particles is called:

How is ice cream made???? Hurry plsss!!!

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Answer:

Milk, cream, milk solids, sugars, modifying agents and flavourings are blended together in stainless steel vats.

The mix is homogenised to create a consistent texture.

The mix is pasteurised by heating at 82-85°C for 15 seconds then cooled to destroy bacteria.

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How many moles of water (H2O) would be produced if 10 moles of O2 gas reacted completely with excess H2 gas?2 H2(g) + O2(g) → 2 H2O(g)

A. 5
B. 10
C. 20
D. 30

Answers

Answer:

C. 20

Explanation:

Use the equation to know that 1 mol of O2 is equal to 2 mol H2O.

Now you will start with the data, this is 10 mol O2 and you obtain:

10 mol O2 x 2 mol H2O = 20 mol H2O

1 mol O2

2 H2(g) + O2(g) → 2 H2O(g)

according to the reaction:
1 mole of O2-----------------2 moles of H2O
10 moles of O2--------------------- x
x = 20 mole of H2O

answer: C

Why alkali metals are found in many common substances but are rarely found in pure form?

Answers

Alkali metals are very reactive so in pure form they quickly react with oxygen, water and other elements and compounds to form new substances. That's why they're found in many substances but rarely in pure form.

43. Which temperature change would cause a sample of an ideal gas to double in volume while the pressure is held constant?(1) from 400.K to 200.K(2) from 200.K to 400.K
(3) from 400.oC to 200.oC
(4) from 200.oC to 400.oC

Answers

This question may be answered by looking at the equation for ideal gases. The ideal gas equation is pV = nRT. Which implies that If pressure is constant (n is constant if the amount of gas is not changed and R is the Universal Constant of Gases), then V / T is constant. Then if V is doubled T is also doubled. Then the answer is the option (2) from 200K to 400K..

................can loosen the chromatin structure. 1. Acetyl groups and methylated amino acids with a neighhoring phosphate group 2. Methylated groups ONLY! 3. Histone groups ONLY 4. Acetyl groups ONLY!

Answers

Answer:1. Acetyl groups and methylated amino acids with a neighboring phosphate group

Explanation:

Final answer:

Option 4. Acetyl group only can loosen the chromatin structure.

Explanation:

Acetyl groups can loosen the chromatin structure by altering the charge of the histone proteins. When unmodified, the histone proteins have a large positive charge, but by adding acetyl groups, the charge becomes less positive, resulting in a looser packing of nucleosomes.

Histone acetylation affects nucleosome spacing and gene expression. When the chromatin structure is loosened through acetylation, transcription factors can bind to the DNA, allowing genes to be expressed. In conclusion, acetyl groups have the ability to loosen the chromatin structure, which allows for gene expression by enabling transcription factors to bind to the DNA. The correct answer is option 4: Acetyl groups ONLY!

Learn more about chromatin here:

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These statements describe three different reactions. 1 - An atom shares electrons with another atom.
2 - The nucleus of an atom is split apart.
3 - An atom gains an electron from another atom.

Which reaction(s) most likely release the greatest amount of energy?
1
2
1 and 3
2 and 3

Answers

Answer: Option (b) is the correct answer.

Explanation:

When an atom shares electrons with another atom then it results in the formation of covalent bond.

Whereas when an atom transfer electrons from one atom to another then it results in the formation of ionic bond.

When nucleus of an atom splits then it represents nuclear fission reaction and energy is released during this process.

For example, $^(235)_(92)U \rightarrow ^(144)_(56)Ba + ^(89)_(36)Kr + 3n + 177 MeV$

Therefore, we can conclude that out of the given options, the nucleus of an atom is split apart most likely release the greatest amount of energy.

The answer is number 2. That releases massive amounts of radiation and by the way, that is how atomic bombs are made to detonate.

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Elements can combine to form molecules, like o2 or co2. elements combine to form molecules and these elements are joined together by a. chemical bonds. b. nuclear energy. c. sharing nuclei. d. attractive forces.

Given the reaction:Ba(OH)2(aq) + H2SO4(aq) -->BaSO4(s) + 2 H2O(l) + energyAs the barium hydroxide solution is added to the solution of sulfuric acid, the electrical conductivity of the acid solution decreases because the(1) volume of the reaction mixture increases(2) temperature of the reaction mixture decreases(3) concentration of ions increases(4) concentration of ions decreases

The table lists the lattice energies of some compounds. Compound Lattice Energy (kJ/mol) LiF –1,036 LiCl –853 NaF –923 KF –821 NaCl –786 Which statement about crystal lattice energy is best supported by the information in the table? The lattice energy increases as cations get smaller, as shown by LiF and KF. The lattice energy increases as the charge of anions increases, as shown by LiF and LiCl. The lattice energy decreases as anions get smaller, as shown by NaCl and NaF. The lattice energy decreases as the charge of cations decreases, as shown by NaF and KF.

Which of the following enzymes would digest a fat? A) sucrose B) lipase C) amylase D) protease