why do some elements have parentheses around the atomic mass what do these parentheses indicate about the elements

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Answer 1

Some element have parentheses around atomic mass because it form subgroup of atom within a molecule. the number in parentheses is the mass no of most stable isotopes of that element

Parentheses means in a particular structure are repeated in molecule called parentheses. parentheses is used because to help identity that there  is more than one polyatomic ion present. parentheses are useless in chemical formula if they don't have a subscript.

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Related Questions

What causes tectonic plates to move?
What is a convergent boundary?
What is a divergent boundary?
What is a transform boundary?
What is a transform boundary?

Answers

The answer is what is transform boundary?
Explain more Transform boundaries -- where crust is neither produced nor destroyed as the plates slide horizontally past each other.

https://pubs.usgs.gov/gip/dynamic/understanding.html

hydrochloric acid + chromium hydrogencarbonate =
how do I complete this word equation and then convert it to a BALANCED word equation

Answers

Answer:

3HCl + Cr (HCO3)3 --> CrCl3 + 3CO2 + 3H2O

the chemical bonds that form when atoms that have lost electrons are electrically attracted to atoms that have gained electrons are called

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They are called ions

an unknown solution has a ph of 7.2. which of these chemicals is likely to cause the greatest decrease in the ph of the solution when added to the solution? (5 points) hf koh nh3 hno3

Answers

The largest pH lowering agent is HNO3 . We need to add more H3O+ to the solution in order to reduce the pH.

What is pH and why is it significant?A solution's pH is a significant indicator of its chemical composition.The pH can affect how readily available nutrients are, how biological processes work, how bacteria behave, and how chemicals behave.How is pH determined?

There are two ways to measure pH: colorimetrically with indicator fluids or sheets and electrochemically with electrodes and a millivoltmeter for greater accuracy (pH meter).

Why is pH in water important?To maintain your body in equilibrium and to control metabolic processes, water pH is crucial. A diet that is too alkaline may prevent critical nutrients from being metabolised, while a diet that is too acidic will cause weight gain, a slowed immune response, and increased susceptibility to disease.

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What is the purpose of having the Periodic Table?

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Answer:

Explanation:

Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table's arrangement also allows scientists to discern trends in element properties, including electronegativity, ionization energy, and atomic radius.

Answer:

Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table's arrangement also allows scientists to discern trends in element properties, including electronegativity, ionization energy, and atomic radius.

Explanation:

The experiments of wöhler, kolbe, miller, and other chemists invalidated the concept of vitalism by demonstrating that _____.

Answers

The experiments of wöhler, kolbe, miller, and other chemists invalidated the concept of vitalism by demonstrating that B) organic molecules could be produced apart from living organisms using inorganic materials.

Concept of vitalism propose that organic molecules could only be synthesised by living organism. Modern science said that vitalism has no credibility.

Adolph Wilhelm Hermann Kolbe (1818 - 1884) contributed to invalidate the concept of vitalism. He made the organic substance acetic acid from inorganic carbon disulfide.

Friedrich Wöhler (1800 - 1882) synthesis of the organic compound urea from inorganic substances.

Abiotic factors are non-living chemical and physical things of the environment.

Abiotic factors can include water, light, radiation, temperature, humidity, atmosphere, and soil.

On the contrary, biotic factors are all of the living organisms within an ecosystem.

Missing options:

A) carbon atoms were common in both living organisms and nonliving substances such as rocks and soil

B) organic molecules could be produced apart from living organisms using inorganic materials

C) tissues extracted from living organisms could still promote organic reactions

D) one organic substance could be transformed into another organic substance

E) complex organic substances are the result of a series of sequential synthetic reactions occurring in both living organisms and nonliving systems.

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give 2 examples of group 1 element ​

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lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
Two examples of Group 1 elements of the Periodic Table of Elements would be sodium and potassium. Together, all Group 1 elements have a common name, that is the “alkali metals.”

. a large piece of jewelry has a mass of 132.6 g. a graduated cylinder initially contains 48.6 ml water. when the jewelry is submerged in the graduated cylinder, the total volume increases to 61.2 ml.

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The large piece of jewelry  that has a mass of 132.6 g and when is submerged in a graduated cylinder that initially contains 48.6 ml water and the volume increases to 61.2 ml once the piece of jewelry is submerged, has a density of: 10.523 g/ml

To solve this problem the formulas and the procedures that we have to use  are:

v = v(f)-v(i)d = m/v

Where:

d= densitym= massv= volumev(f) = final volumev(i) = initial volume

Information about the problem:

m = 132.6 gv(i) = 48.6 mlv(f) = 61.2 mlv = ?d =?

Applying the volume formula we get:

v = v(f)-v(i)

v = 61.2 ml - 48.6 ml

v = 12.6 ml

Applying the density  formula we get:

d = m/v

d = 132.6 g/12.6 ml

d = 10.523 g/ml

What is density?

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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What is the energy if the frequency is 8.33 x 10^-4 Hz

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오늘 저녁에 집에 와서 같이 저녁을 먹을까 아니면

Need answer ASAP please

Answers

The following elements are given in the table:

BerylliumSiliconSodiumChromiumPotassiumOxygenCarbonGold

For the complete table, refer attachment.

Simple rules can be used to calculate the number of protons, neutrons, electrons, mass number and atomic number in an atom:

The atomic number (Z) of an atom is equal to the number of protons in its nucleus.A neutral atom has the same number of electrons as protons.The sum number of protons and neutrons in the atom's nucleus is equal to the mass number (A) of the atom.The difference between the atomic number (Z) and the mass number of the atom (A) is equal to the number of neutrons.

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(a) how many different isotopes of the element were in the sample? (b) describe how to use the information from the mass spectrum to determine the average atomic mass of the element.

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The ground state electron configuration of the element is; 1s2 2s2 2p6 3s2.

What is the mass spectrum?

The mass spectrum shows the identity of an element. We can use it to identify the number of isotopes in the elements as well as the abundance of each of the isotopes.

Now, the element that is here has three isotopes, the element is magnesium. We can obtain the relative atomic mass as the sum of the products of the mass of each isotope and its relative abundance. The ground state electron configuration of the element is; 1s2 2s2 2p6 3s2.

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electrical double layer design for proton-coupled electron transfer electrode processes: recent advances in well-defined electrode−electrolyte interface

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The article aims to highlight the most recent improvements in the PCET procedures for electrocatalysis at clearly characterized electrodeelectrolyte interfaces.

Aim : Here, we focus on the most recent developments in the PCET methods for electrocatalysis at clearly defined electrodeelectrolyte interfaces.

Method: Since the groundbreaking and ongoing studies made by Frumkin and his colleagues initiated in the 1930s, non-covalent interaction, which is controlled by the cation/anion features, is known to play a crucial role in the interfacial water and adsorbate environments correlated to electrodeelectrolyte catalytic properties.

The microscopic perspective of this interaction is still a significant scientific mystery, nevertheless. Recent research based on the well-defined surface and solid-liquid interfacial structure of single-crystal model electrodes revealed novel characteristics of the cation effect.

Practical usage: Designing high-performance electrode and electrolyte materials requires an understanding of the roles played by the electrical double layer (EDL) structure in proton-coupled electron transfer (PCET) electrode processes.

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The smallest unit of an element that has the chemical properties of the element is the.

Answers

Answer: An atom

Hope this helps!

Calculate the heat change in kilojoules for vaporization of 6.00 kg of water at 100 ∘C .

Answers

The heat change for vaporization of 6.00 kg of water at 100°C is 13490.584 kJ.

The heat or enthalpy for vaporization is the amount of heat energy which is required to bring change in the state of a substance, such as from a liquid into a vapor or gas. It is also known as enthalpy of vaporization. The unit of enthalpy for vaporization is given in joules (J) or calories (cal).

Given data :

mass of water = 6.00 kg

Hvap = 40.7 kJ/mol

To calculate the amount of heat -

we know,

the heat required for 1 mol of water to vaporize at 100°C is 40.7 kg

and

we know molar weight of water is  18.015 gram

So,

moles of 6.00 kg water is  = 2600  

                                               18.1015

mole of water = 331.464 mol

Hence,

Heat change for vaporization is = 331.464 × 40.7

                                                     = 13490.584 kJ

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brainly which change is chemical?(1 point) water freezing: liquid water becoming solid water water freezing: liquid water becoming solid water water boiling: solid water becoming gaseous water water boiling: solid water becoming gaseous water water evaporating: liquid water becoming gaseous water water evaporating: liquid water becoming gaseous water water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules

Answers

An example of a chemical change is water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules.

In chemistry, changes are classified into two: physical and chemical.

A physical change occurs when a substance or object changes its appearance, phase, or is used in a mixture. More importantly, a physical change does not change the molecular structure of a substance. These three are examples of physical changes in water, wherein the changes are on their phases only:

water freezing: liquid water becoming solid water

water boiling: solid water becoming gaseous water

water evaporating: liquid water becoming gaseous water

On the other hand, a chemical change takes place when the original substance's of molecules are taken apart and put back together into new combinations that are different from the original combinations. An example of this is water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules, wherein a compound of water molecule is being break down into different molecules.

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What does it mean to use an empirical approach when attempting to answer a question?

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Using an empirical approach when attempting to answer mean your answer should be based on data that is backed by experiments and evidence.

It is an experiment-based approach based on real-world data and results. The empirical approach-based answer should not be made up of theories and concepts. Your calculations and results should be based on experiences in the real world. Empirical research can be Quantitative research (information based on numerical data) or Qualitative (non-numerical).

On the other hand, non-empirical or theoretical answers are based on theories and concepts that have not been experimented as of now.

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anything that can change in an experiment is called

Answers

Answer:

variables because they can change or be changed

Using the information in the table to the right, calculate the average atomic mass of strontium. Report to two decimal places. amu A 3 column table with 4 rows titled Strontium. Column 1 is labeled Isotope with entries Upper S r-84, Upper S r-86, Upper S r-87, Upper S r-88. Column 2 is labeled Mass (a m u) with entries 83.913428, 85.909273, 86.908902, 87.905625. Column 3 is labeled Abundance (percent) with entries 0.56, 9.86, 7, 82.58.

Answers

The average atomic mass of strontium reported to two decimal places is 87.62 amu

The average atomic mass of an element may be determined by adding the atomic mass units of all its isotopes and dividing the result by the abundance percent/100.The average atomic mass of strontium (Sr) = [(atomic mass of Sr-84)(Abundance / 100) + (atomic mass of Sr-86)(Abundance / 100) + (atomic mass of Sr-87)(Abundance / 100) + (atomic mass of Sr-88)(Abundance / 100)].The average atomic mass of strontium[tex](Sr) = [(83.913428)(0.0056) + (85.909273)(0.0986) + (86.908902)(0.07) + (87.905625)(0.8258)][/tex]= 87.6166 amu ≅ 87.62 amu.The weighted average mass of the atoms in a naturally. The average atomic mass, commonly referred to as atomic weight, is a naturally occurring sample of an element. The standard units for expressing average masses are unified atomic mass units (u), where 1 u equals precisely one-twelfth the mass of a neutral atom of carbon-12.

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an agricultural chemist wished to study the effect of varying fertilizer applications on the growth of tomato plants. the chemist prepared a "stock" aqueous solution of urea, (nh2)2co, by dissolving 1.75 g of this compound in water to make 1.00 l of solution. then she prepared a series of more dilute solutions to apply to her tomato plants. one of these solutions contained 5.00 ml of "stock" solution diluted to give a final volume of 25.00 ml. what was the concentration of urea in this diluted solution?

Answers

The concentration of Urea in final solution will be [tex].00725[/tex] M.

We know that

[tex]M_1/M_2 = V_1/V_2[/tex]

where

[tex]M_1[/tex] is the concentration of solute in first solution

[tex]M_2[/tex]  is the concentration of solute in second solution

[tex]V_1[/tex] is the volume of first solution

[tex]V_2[/tex] is the volume of second solution

According to question,

Solute is Urea whose molecular weight is 60gm

1,75 gram of urea is used

Therefore moles of urea used =  [tex]1.75/60[/tex]

                                                  =   .029

Molarity of urea =  [tex].029/1L[/tex]

                           = .029

Volume of first solution = 5ml

Volume of second solution = 20ml   ( [tex]25 - 5 = 20[/tex])

Therefore,

             [tex].029/M_2 = 5/20[/tex]

[tex]M_2 = .00725[/tex]

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Calculate the mass of 2.5 × 1023 formula units of calcium phosphate Ca,(PO4)2

Answers

Answer:

310 u

Explanation:

Hence, the formula unit mass for Ca 3 ( PO 4 ) 2 is 310 u .

For a snack, I ate 40 gummy bears. Each gummy bear weighs 3g.

If gummy bears are 100% carbohydrates and carbohydrates are 4 kcal/g, how many kcal I eat?

Answers

Taking into account the rule of three, you eat 480 kcal.

Rule of three

The rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.

That is, what is intended with it is to find the fourth term of a proportion knowing the other three.  

If the relationship between the magnitudes is direct, the direct rule of three must be applied as follow, being a, b and c known data and x the variable to be calculated:

a ⇒ b

c ⇒ x

So: x= (c×b)÷ a

kcal of eaten gummy bears

To know the mass of eaten gummy bears, the following rule of three applies: if 1 gummy bear weighs 3 g, 40 gummy bears weigh how much mass?

1 gummy bear ⇒ 3 g

40 gummy bears ⇒ x

So: x= (40 gummy bears× 3 g)÷ 1 gummy bear

Solving:

x= 120 g

If gummy bears are 100% carbohydrates and carbohydrates are 4 kcal/g, the following rule of three applies: If 1 g has 4 kcal, 120 g has how many kcal?

1 g ⇒ 4 kcal

120 g⇒ x

So: x= (120 g× 4 kcal)÷ 1 g

Solving:

x= 480 kcal

In summary, you eat 480 kcal.

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What is the independent variable?
what is the dependent variable?
what are the constants?
what equipment and materials will you use? (please include amounts and use SI units if possible)
what data and observations will you record?
what safety precautions will you take?
what is the general procedure you will follow for your experiment? (this can be in a paragraph or numbered list form)

Answers

Answer:

independent variable is what you change in a science experiment, dependent variable is what's being measured in a science experiment. any characteristics, number, or quantity that can be measured or counted. A variable may also be called a data item.

A constant is a quantity that does not change. Although you can measure a constant, you either cannot alter it during an experiment or else you choose not to change it. Contrast this with an experimental variable, which is the part of an experiment that is affected by the experiment.

for materials and equipment, can be a ruler, and a data chart to put information, and a timer if needed,

you will record the amount of baking powder you have, and make observations of making sure you have the right amount of baking powder.

also make sure your experiment is safe.

I guess you can use a data chart to keep track of your information, and you can make a hypothesis, conlusion, BUT NO OPINION, make sure to know that before starting a experiment

A student is performing an experiment that requires measuring the boiling point of water. The accepted value for the boiling point of pure water is 100.0ºC. In the experiment, the student measured the boiling point to be 99.2ºC. What is the percent error in the student’s experiment?

Answers

percentage error in the student’s experiment is 0.8%

To find percentage error we use the formula I E -T I / I T I X100

so by the given data experimental value is 99.2ºC and actual theoretical value is 100.0ºC by putting the values we get 0.8% error.

To determine how closely the measured number resembles the real value, the percentage error is calculated. It is a component of a thorough error analysis. In most domains, % error is always reported as a positive figure, although in some, either a positive or negative value is acceptable.

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Answer: B

Explanation: :)

Carlos likes to bowl. He timed how long it took for his ball to travel the length of an 18-m lane in the bowling alley. He plotted the final distance and time on a line graph. Carlos drew a line from this point to the origin of the graph.

Answers

Carlos likes to bowl. He timed how long it took his ball to travel the length of the bowling alley's 18-meter lane. The ball will travel 12 m far after it had travelled for 2 s.

What is length?

Length can be defined as a term used for identifying the size of an object and distance travelled by the object from one point to another point.

The S.I. unit of length is meter.

It can also be defined as the amount of time that something can last.

Thus, Carlos likes to bowl. He timed how long it took for his ball to travel the length of an 18-m lane in the bowling alley. The ball will travel 12 m far after it had travelled for 2 s.

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Your question is incomplete but most probably your full question was

Carlos likes to bowl. He timed how long it took for his ball to travel the length of a an 18-m lane in the bowling alley. He plotted the final distance and time on a line graph. Carlos drew a line from this point to the origin of the graph.

How far down the lane was the ball after it had traveled for 2 s?

6 m

9 m

12 m

18 m

Explain why the bears would need to "pack on enough pounds" before they hibernate

Answers

If the bears don't pack on enough pounds before they hibernate, they won't enough energy that will sustain them during the hibernation period.

What is hibernation?

Hibernation is a condition when an animal slows its heart rate to save energy and survive the winter without eating much.

Some animals just slow down and move less frequently during hibernation, but others go into a deep sleep and don't wake up till spring.

What would happen to bears if they don't pack on enough pounds?

If the bears don't pack on enough pounds before they hibernate, they won't return to the mountains to den for the winter.

Packing on enough pounds will provide them with enough energy that will sustain them during the hibernation period.

Thus, If the bears don't pack on enough pounds before they hibernate, they won't enough energy that will sustain them during the hibernation period.

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a voltaic cell is based on the reduction of ag (aq) to ag(s) and the oxidation of sn(s) to sn2 (aq).

Answers

Half-reaction for the cell's anode is given below:

Anode : [tex]\\Sn(s) \rightarrow Sn^{2+} (aq) +2e^{-}[/tex]

The anode is defined as the electrode at which electrons leave the cell and oxidation occurs, and the cathode as the electrode at which electrons enter the cell and reduction occurs. The anode is usually the positive side.

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Your given question is quite incomplete here is complete question.

A voltaic cell is based on the reduction of _ Agt(aq) to Ag(s) and the oxidation of Sn(s) to Sn2+(aql) : Part 1  Include the phases of all species in the chemical equation: (aqh Anode: Sn(s) Sn?+ (aq)

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which best explains why ionization energy tends to decrease from the top to the bottom of a group? the number of orbitals decreases. the number of neutrons decreases.

Answers

Ionization energy tends to drop from the top to the bottom of a group as electrons move away from the nucleus.

What does the periodic table's ionisation energy mean?

All elements in the periodic table possess ionisation energy, also known as ionisation potential.

what does "ionisation energy" mean?

It is the energy needed to remove one electron from a neutral atom, which results in the formation of an ion.

High ionisation Energy: What Does It Mean?The neutral atom's loosest electron is removed by the first ionisation energy, but the amount of protons acting as an attractive force on the remaining electrons remains constant. This implies that it will be harder and more energy-intensive to remove a second electron.

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the question you are looking for is

Which best explains why ionization energy tends to decrease from the top to the bottom of a group?

A.The number of orbitals decreases.

B.The number of neutrons decreases.

C.Electrons get closer to the nucleus.

D.Electrons get farther from the nucleus.

can someone help please. you will get 15 points

Answers

We could use a large size sieve to separate large stones from pear sized gravel. Option A

What is a sieve?

A sieve is a device that could be used for separation. When we are carrying out separation using a sieve, the separation is done according to the sizes of the materials. We know that the sieve allows a given size of the material to pass through while holding back the other sizes.

In this case, we can see a sieve that has been pictured in the question. The size of the sieve is what determines the kind of things that it could separate. As such, we could use a large size sieve to separate large stones from pear sized gravel. Option A

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Based on the amino acid sequences of each histone, estimate the charge of a histone octamer at ph 7. Assume that histidine residues are uncharged at this ph.

Answers

The histone octamer has a total charge of +146 at pH 7 if histidine residues are assumed to be uncharged.

There are 9 negatively charged (Asp + Glu) and 26 positively charged (Arg + Lys) residues in total on histone H2B.

The net charge on H2A is 26 - 9 = +17.

There are 10 negatively charged (Asp + Glu) and 28 positively charged (Arg + Lys) residues in total on histone H2B.

The net charge on H2B is 28 - 10 = +18.

There are 11 negatively charged (Asp + Glu) and 31 positively charged (Arg + Lys) residues in total on histone H3.

The net charge on H3 is 31 - 11 = +20.

There are 7 negatively charged (Asp + Glu) and 25 positively charged (Arg + Lys) residues in total on histone H4.

The net charge on H4 is 25 - 7 = +18.

2 x (17 + 18 + 20 + 18) = +146 is the total charge of the histone octamer.

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CHEMISTRY, HELP!!! (Please explain as well if you can because I have at least five more questions like this after I finish this one)

Answers

Based on the Law of conservation of mass, the product form when baking soda decomposes is also 25 g.

NaHCO₃ => Na₂CO₃ + H₂O + CO₂

reactant mass = product mass  (law of conservation)

The law of conservation of mass or principle of mass conservation states that for any machine close to all transfers of rely and energy, the mass of the gadget has to remain consistent over the years because the gadget's mass cannot alternate, so the amount can neither be added nor be removed.

The law of conservation of mass states that during a chemical reaction mass is neither created nor destroyed. as example, the carbon atom in coal turns into carbon dioxide while it is burned. The carbon atom modifications from a strong shape to a gas however its mass does not trade.

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