Which of the following is NOT a chemical group commonly found on core histone N-terminal tails for chromatin regulation?
a. methyl
b. sulfhydryl
c. phosphoryl
d. acetyl

"The other halogens are not as electronegative and so other hydrogen halides cannot form hydrogen bonds between molecules. Only London Forces are formed. - Therefore more energy is required to break the intermolecular forces in HF than the other hydrogen halides and so it has a higher boiling point."

not a hack link, just stating where i got your answer from! -

https://www.mytutor.co.uk/answers/17558/A-Level/Chemistry/Explain-the-unusually-high-boiling-point-of-HF/

Answer:

it can be used to date the sedimentary rock where the fossils of ancient humans or their hominid ancestors are found.

Explanation:

hope it helps

Answer:

They would be to heavy and you would be really stiff

Explanation:

Imagine walking in a suit made of iron or tin

You would feel like the Tin Man

You would be stiff

Metals are hard and heavy

The melting of 1.5 mol of ice releases 9.015 kJ of heat.

Ice melts by absorbing heat, but the temperature doesn't change since the extra heat is expended in releasing the force that holds the ice particles together. Latent heat of fusion is the name given to this energy, which is thought to be concealed within ice.

6.01 kJ/mol is the molar heat of fusion of ice.

Hence, Q = n  Hfus can be used to calculate the amount of heat absorbed by the melting of 1.5 mol of ice.

Q = 1.5 moles times 6.01 kJ/mol

Q = 9.015 kJ

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Despite the blind spot in front of the shark, its wide-set eyes improve its peripheral vision.

Vision is the ability to perceive objects and information using light that enters the eye. It is the sense that allows us to recognize shapes, colors, and distances, as well as interpret and understand the world around us. Vision is made possible by the light-sensitive cells in the eye, which convert light into electrical signals that are sent to the brain.

This means that the shark can see what is happening around it even if it cannot see directly in front of it. This allows the shark to more easily detect prey that may be lurking in its periphery. The improved vision also helps the shark to more effectively maneuver when pursuing prey. It is possible that the wide-set eyes evolved in response to the need to hunt more effectively, despite the blind spot. The wide-set eyes may have been favored by natural selection, as the sharks with this trait were more successful at catching prey.

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Answer:

Ionic bonds are a class of chemical bonds that result from the exchange of one or more valence electrons from one atom, typically a metal, to another, typically a nonmetal. This electron exchange results in an electrostatic attraction between the two atoms called an ionic bond.

Explanation:

Answer:

The electrons are transferred from one atom to another. The atom that loses electrons becomes positive.

Explanation:

I don't really understand what form of an answer you need but I hope this helps?

Answer:

59.46 g

Explanation:

To answer this question, the molecular weight of ammonium sulfate must be computed.  To accomplish this, the weights of the individual elements must be noted.
N=14.01\(\frac{g}{mol}\)

H=1.01\(\frac{g}{mol}\)

S=32.07\(\frac{g}{mol}\)

O=16.00\(\frac{g}{mol}\)

To compute the molecular weight:

\(2[14.01\frac{g}{mol}+4(1.01\frac{g}{mol})]+32.07\frac{g}{mol}+4(16.00\frac{g}{mol})=132.14\frac{g}{mol}\)

To calculate the mass:

\(0.45 mol(\frac{132.14g}{1mol})=59.463g\)

Answer:

1 Hydrogen 1s1

2 Helium 1s2

3 Lithium [He]2s1

4 Beryllium [He]2s2

5 Boron [He]2s22p1

6 Carbon [He]2s22p2

7 Nitrogen [He]2s22p3

8 Oxygen [He]2s22p4

9 Fluorine [He]2s22p5

10 Neon [He]2s22p6

11 Sodium [Ne]3s1

12 Magnesium [Ne]3s2

13 Aluminum [Ne]3s23p1

14 Silicon [Ne]3s23p2

15 Phosphorus [Ne]3s23p3

16 Sulfur [Ne]3s23p4

17 Chlorine [Ne]3s23p5

18 Argon [Ne]3s23p6

19 Potassium [Ar]4s1

20 Calcium [Ar]4s2

21 Scandium [Ar]3d14s2

22 Titanium [Ar]3d24s2

23 Vanadium [Ar]3d34s2

24 Chromium [Ar]3d54s1

25 Manganese [Ar]3d54s2

26 Iron [Ar]3d64s2

27 Cobalt [Ar]3d74s2

28 Nickel [Ar]3d84s2

29 Copper [Ar]3d104s1

30 Zinc [Ar]3d104s2

31 Gallium [Ar]3d104s24p1

32 Germanium [Ar]3d104s24p2

33 Arsenic [Ar]3d104s24p3

34 Selenium [Ar]3d104s24p4

35 Bromine [Ar]3d104s24p5

36 Krypton [Ar]3d104s24p6

37 Rubidium [Kr]5s1

38 Strontium [Kr]5s2

39 Yttrium [Kr]4d15s2

40 Zirconium [Kr]4d25s2

41 Niobium [Kr]4d45s1

42 Molybdenum [Kr]4d55s1

43 Technetium [Kr]4d55s2

44 Ruthenium [Kr]4d75s1

45 Rhodium [Kr]4d85s1

46 Palladium [Kr]4d10

47 Silver [Kr]4d105s1

48 Cadmium [Kr]4d105s2

49 Indium [Kr]4d105s25p1

50 Tin [Kr]4d105s25p2

51 Antimony [Kr]4d105s25p3

52 Tellurium [Kr]4d105s25p4

53 Iodine [Kr]4d105s25p5

54 Xenon [Kr]4d105s25p6

55 Cesium [Xe]6s1

56 Barium [Xe]6s2

57 Lanthanum [Xe]5d16s2

58 Cerium [Xe]4f15d16s2

59 Praseodymium [Xe]4f36s2

60 Neodymium [Xe]4f46s2

61 Promethium [Xe]4f56s2

62 Samarium [Xe]4f66s2

63 Europium [Xe]4f76s2

64 Gadolinium [Xe]4f75d16s2

65 Terbium [Xe]4f96s2

66 Dysprosium [Xe]4f106s2

67 Holmium [Xe]4f116s2

68 Erbium [Xe]4f126s2

69 Thulium [Xe]4f136s2

70 Ytterbium [Xe]4f146s2

71 Lutetium [Xe]4f145d16s2

72 Hafnium [Xe]4f145d26s2

73 Tantalum [Xe]4f145d36s2

74 Tungsten [Xe]4f145d46s2

75 Rhenium [Xe]4f145d56s2

76 Osmium [Xe]4f145d66s2

77 Iridium [Xe]4f145d76s2

78 Platinum [Xe]4f145d96s1

79 Gold [Xe]4f145d106s1

80 Mercury [Xe]4f145d106s2

81 Thallium [Xe]4f145d106s26p1

82 Lead [Xe]4f145d106s26p2

83 Bismuth [Xe]4f145d106s26p3

84 Polonium [Xe]4f145d106s26p4

85 Astatine [Xe]4f145d106s26p5

86 Radon [Xe]4f145d106s26p6

87 Francium [Rn]7s1

88 Radium [Rn]7s2

89 Actinium [Rn]6d17s2

90 Thorium [Rn]6d27s2

91 Protactinium [Rn]5f26d17s2

92 Uranium [Rn]5f36d17s2

93 Neptunium [Rn]5f46d17s2

94 Plutonium [Rn]5f67s2

95 Americium [Rn]5f77s2

96 Curium [Rn]5f76d17s2

97 Berkelium [Rn]5f97s2

98 Californium [Rn]5f107s2

99 Einsteinium [Rn]5f117s2

100 Fermium [Rn]5f127s2

101 Mendelevium [Rn]5f137s2

102 Nobelium [Rn]5f147s2

103 Lawrencium [Rn]5f147s27p1

104 Rutherfordium [Rn]5f146d27s2

105 Dubnium *[Rn]5f146d37s2

106 Seaborgium *[Rn]5f146d47s2

107 Bohrium *[Rn]5f146d57s2

108 Hassium *[Rn]5f146d67s2

109 Meitnerium *[Rn]5f146d77s2

110 Darmstadtium *[Rn]5f146d97s1

111 Roentgenium *[Rn]5f146d107s1

112 Copernium *[Rn]5f146d107s2

113 Nihonium *[Rn]5f146d107s27p1

114 Flerovium *[Rn]5f146d107s27p2

115 Moscovium *[Rn]5f146d107s27p3

116 Livermorium *[Rn]5f146d107s27p4

117 Tennessine *[Rn]5f146d107s27p5

118 Oganesson *[Rn]5f146d107s27p6

Explanation:

Answer:

20 MPH (miles per hour)

Explanation:

You do miles / time (miles divided by time) to calculate the average speed!

Hope this helped ^^

Answer:

Special type of surface that repels liquid

Explanation:

Answer: There are no attractive or repulsive forces between particles.

Explanation: Gas molecules influence each other only by collision

Increasing the particle size of the column packing in an HPLC column affect the terms of the van Deemter equation such as  B is unchanged; A and C are increased. The answer is D.)

In the van Deemter equation, the terms A, B, and C represent various factors that contribute to band broadening in an HPLC column. Increasing the particle size of the column packing affects the terms as follows:

A - Eddy diffusion (A) is directly related to particle size; as particle size increases, A increases.
B - Longitudinal diffusion (B) is not significantly affected by the particle size of the column packing, so it remains unchanged.
C - Resistance to mass transfer (C) increases with increasing particle size, as it takes longer for solutes to equilibrate between the stationary and mobile phases.

Thus, the correct option is D, where B is unchanged, and both A and C are increased.

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Answer:

Metal

Explanation:

Foam, glass, and plastic don't absorb as much heat as metal does.

The purpose of steps in crystallization of organic solid is to obtain pure crystals of the desired compound.

Crystallization is a technique for separating substances based on their solubility properties. It is a commonly used technique in the chemical industry for separating chemical compounds from a solution or a mixture. The purpose of steps in crystallization of organic solid is to obtain pure crystals of the desired compound. Here are the steps involved in crystallization:
Dissolving the solid: The organic solid is dissolved in a suitable solvent to form a saturated solution.
Filtration: The solution is filtered to remove any insoluble impurities that might be present.
Cooling: The solution is cooled slowly and carefully to allow the crystals to form.
Crystallization: The crystals are collected by filtration or decantation.
Drying: The crystals are dried in a desiccator to remove any residual solvent.
These steps ensure that the crystals obtained are pure and of a high quality. The slow cooling process is particularly important, as it allows the crystals to form in a controlled manner, which helps to ensure their purity. The drying process is also important, as it helps to remove any residual solvent that might be present, which can affect the purity of the crystals.

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To solve this problem we are going to assume that the temperature at which the gold is found is room temperature.

We are going to use a property of materials that relates mass to volume, this is density. At this temperature, the density of gold is 19.3g/mL, the equation of density is:

We will use the following conversion factors:

1mL=1000mm^3

1atom=3.271x10^-22g

So, the atoms present in 3.00mm^2 will be:

In 3.00mm^3 of gold, there are 1.77x10^20 atoms

Answer: 1.77x10^20 atoms

high frequency waves have short wavelengths

The main differences in the synthesis of purine and pyrimidine nucleotides -

What are 2 differences between purine and pyrimidine?

What are the structural differences among purines and pyrimidines in DNA and RNA?

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Ca is the correct answer. Maybe

here's your answer hope this will help

The temperature at which 0.0828 moles of hydrogen would have a pressure of 1.00 atm and a volume of 55.0 L is 743 K .

The ideal gas law is a fundamental equation of state for an ideal gas.

We can use the Ideal Gas Law to solve for the temperature:

PV = nRT

Where

First, we need to convert the number of moles to moles:

n = 0.0828 mol

Next, we can substitute the given values into the Ideal Gas Law and solve for T:

T = PV/nR = (1.00 atm) x (55.0 L) / (0.0828 mol x 0.0821 L·atm/mol·K) = 743 K

Therefore, the temperature at which 0.0828 moles of hydrogen would have a pressure of 1.00 atm and a volume of 55.0 L is 743 K.

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Answer:

I'm sorry, but I cannot see the observations or the data table you mentioned in your question. However, I can still provide you with some general guidance on how to approach the calculations and answer the questions based on the given information.

4. To calculate the concentration of the NaOH solution, you need to know the mass of NaOH used and the volume of the solution. The formula to calculate concentration is:

Concentration (in mol/L) = (Mass of NaOH (in grams) / molar mass of NaOH) / Volume of solution (in L)

Make sure to convert the mass of NaOH to moles by dividing it by the molar mass of NaOH. The molar mass of NaOH is the sum of the atomic masses of sodium (Na), oxygen (O), and hydrogen (H).

5. The balanced equation for the neutralization reaction between NaOH and HCl is:

NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

(aq) represents an aqueous solution, and (l) represents a liquid.

6a. To calculate the average concentration of HCl in the sample from site B, you need to know the volumes and concentrations of the NaOH and HCl solutions used in the titration. Use the formula:

Concentration of HCl (in mol/L) = (Volume of NaOH solution (in L) * Concentration of NaOH (in mol/L)) / Volume of HCl solution (in L)

Multiply the volume of NaOH solution used by its concentration to find the amount of NaOH used. Then, divide this amount by the volume of HCl solution used to find the concentration of HCl.

6b. To determine the pH of the water at site B, you need to know the concentration of HCl from the previous calculation. The pH can be calculated using the formula:

pH = -log10[H+]

Since HCl is a strong acid, it dissociates completely into H+ ions. Therefore, the concentration of H+ ions is equal to the concentration of HCl. Take the negative logarithm (base 10) of the H+ concentration to find the pH.

To check if the water is safe, compare the calculated pH value to the range provided (pH 4.5-7.5). If the pH falls within this range, the water is considered safe for plant and animal reproduction in an aquatic environment.

6c. Use a similar calculation as in 6a to determine the average concentration of HCl in the sample from site C.

6d. Use the concentration of HCl from 6c to calculate the pH using the formula in 6b. Follow the same procedure to check if the water is safe based on the pH range.

7. To find the most current pH value for the Grand River, you can search for the latest data from reliable sources such as environmental agencies, research institutions, or government websites. Compare this pH value to the pH values obtained in the experiment to assess the difference between them.

Remember, without the specific data and observations, the calculations and comparisons provided here are only general guidelines. It's important to use the actual data from your experiment to obtain accurate results and conclusions.

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Answer:

A Law

Explanation:

A scientific law talks about a law which has been observed and found to be always true but does not explain the reason behind it or the underlying causes which makes such an event to occur.

For example the law of conservation of energy states that energy can neither be created or destroyed, but can be converted from one form to another or transferred from one object to another.

In this law there is no reason why this happens and doesn’t state the causative factors.

Answer: bromine

Explanation:

There are a total of 2+2+6+2+6+2+10+5=35 electrons, meaning there are 35 protons. The element with atomic number 35 is bromine

Based on the equation of the reaction, nitrogen is the limiting reagent while hydrogen is the excess reagent.

Hydrogen and nitrogen combines to form ammonia ina mole ratio of 3 : 1 as shown by the equation of the reaction below:

The number of moles of the reactants in 14g of Nitrogen gas and 8.0g of hydrogen is calculated as follows:

Molar mass of N_{2} = 14.0 g

Molar mass of H_{2} = 2.0 g

Moles of N_{2} = 14/14.0 = 1 mole

Moles of H_{2} = 8/2.0 = 4 moles

Based on the data above:

Therefore, the limiting reagent is nitrogen while hydrogen is the excess reagent.

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Answer:

P3

Explanation:

Im pretty sure hope this helps

Hello!

Answer:

They utilize differences and similarities because some things look almost identical but like one or more things are different about another.

Explanation:

Like a lizard, two lizards have the same face, body shape, etc. but the markings are different, that allows scientists to identify the type of lizard the lizards are, because of the difference.

Hope this helps!

-Starr

Answer:

The ocean is made up of salt water, which is a combination of fresh water, plus minerals collectively called "salts." These salts aren't just sodium and chloride (the elements that make up our table salt), but other minerals such as calcium, magnesium, and potassium, among others.

Explanation:The answer is since particles can be found in ocean water It is a compound, since it results from the combination of elements It is a solution

In molecular compounds, atoms will "share" electrons instead of gaining or losing them.

Atoms share electrons with other atoms to form covalent bonds in molecular compounds like covalent compounds. Both atoms are able to create a more stable electron configuration thanks to the contribution of electrons from each atom to the shared connection. Without a full transfer of electrons, as in the case of ionic compounds, this sharing of electrons makes it possible to build molecules.

In contrast, atoms with differing electronegativities transfer electrons to create ions in ionic compounds. An ionic lattice structure is created as a result of the electrostatic interaction between the positive and negative ions.

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