PLEASE HELP!!! which of these atoms are isotopes??

Answer:

21.107

Explanation:

because this answer gives you 10 and also 90

The balanced reaction equations are given below. They are all examples of double displacement.

a) balanced reaction equation of the reaction between aqueous copper(II) nitrate and aqueous potassium hydroxide, resulting in the formation of solid copper(II) hydroxide and aqueous potassium nitrate

[tex]Cu(NO_{3} )_{2}(aq)+2KOH(aq)[/tex] → [tex]Cu(OH)_{2} (s) + 2KNO_{3}(aq)[/tex]

b) balanced reaction equation of the double displacement between gaseous boron cyanide and liquid water resulting in the formation of solid boric acid and gaseous hydrogen cyanide

[tex]2B(CN)_{3} (g) + 6H_{2} O[/tex] → [tex]2H_{3} BO_{3} (s)+6HCN(g)[/tex]

c) balanced reaction equation between solid calcium silicate and gaseous hydrogen fluoride resulting in the formation of gaseous silicon fluoride, solid calcium fluoride and liquid water

[tex]CaSiO_{3}(s) + 6HF (g)[/tex] → [tex]SiF_{4}(g)+CaF_{2}(s)+3H_{2}O(l)[/tex]

d) balanced reaction equation between cyanogen gas and liquid water resulting in formation of aqueous oxalic acid and gaseous ammonia

[tex](CN)_{2}(g) + 4H_{2} O (l)[/tex] → [tex]H_{2} C_{2} O_{4} (aq) +2NH_{3} (g)[/tex]

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The student observed the solution before it wind put into the flame and realized it was similar in texture and colour to,  the lithium chloride the teacher showed them. When they  saw that both lithium chloride and the unknown produced a red flame, they were sure that the unknown must have been lithium chloride as well

A compound refers to a substance consisting of identical molecules composed of atoms of two or more chemical elements.  That is called a chemical compound. A chemical compound means a chemical substance consisting of several similar molecules containing elements of several elements.

Most notably, these molecules are linked by chemical bonds.  A chemical formula expresses the number of atoms of each element in a molecule of a compound. In addition, this chemical formula uses standard abbreviations for chemical elements with numerical signatures.

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The mass of water produced from 50 g of hydrochloric acid and excess potassium hydroxide is determined to be 24.7 grams.

The balanced chemical reaction of equation is :

HCl + KOH  →  H₂O + KCl

First we will convert the mass of HCl from grams to moles,

Molar mass of HCl = 1.008 g/mol + 35.45 g/mol

Molar mass of HCl = 36.45 g/mol

Then, we will convert the mass of H₂O from grams to moles,

Molar mass of H₂O = 2 x (1.008 g/mol) + 16.00 g/mol

Molar mass of H₂O = 18.01 g/mol

Now, we will calculate the moles of HCl

Moles of HCl = Given mass

                         Molar mass

Moles of HCl =  50 g     = 1.37 mol

                         36.45 g

We know that,

1 mole of HCl is required to produce 1 mole of water

Then, 1.37 mole of HCl forms 1.37 mole x 18.01 g = 24.7 grams

                                                          1 mole

Hence,

The mass of water produced is 24.7 grams.

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a)The 4.48 mol H₂O₂ contains 8.96 moles of oxygen atoms.

b)The 2.15 mol N₂O contains 2.15 moles of oxygen atoms.

c)The 0.0237 moles H₂CO₃ contains 0.0711 moles of oxygen atoms.

d)The 24.1 mol CO₂ contains 48.2 moles of oxygen atoms.

A mole is 6.02214076 x 1023 of any chemical unit, comprising atoms, molecules, ions, and others. Due to the large number of atom, molecules, or other components that comprise any material, the mole is an useful unit to utilize.

There are two moles of H and two moles of O in every mole of H₂O₂

There are two moles of N and one mole of O in every mole of N₂O

There are 2 moles of H, 1 mole of C, and 3 moles of O in a mole of H₂CO₃

1 moles of C and 2 moles of O are present for every mole of CO₂

Taking this into account:

The number of moles of oxygen atoms present in a 4.88 moles sample of H₂O₂ can be determined by:

[tex]\text { 4.48 molesof } \mathrm{H}_2 \mathrm{O}_2 x \frac{2 \text { moleso foxygen }}{1 \text { moleof } \mathrm{H}_2 \mathrm{O}_2}=[/tex]8.96 moles of oxygen atoms

The 4.48 mol H₂O₂ contains 8.96 moles of oxygen atoms.

The number of moles of oxygen atoms present in a 2.15 moles sample of N₂O can be determined by:

[tex]2.15 \text { molesof } N_2 O x \frac{1 \text { molesofoxygen }}{1 \text { moleof } N_2}=[/tex]2.15 moles of oxygen atoms

The 2.15 mol N₂O contains 2.15 moles of oxygen atoms.

The number of moles of oxygen atoms present in a 0.0237 moles sample of H₂CO₃ can be determined by:

[tex]0.0237 \text { molesof } \mathrm{H}_2 \mathrm{CO}_3 x \frac{3 \text { moleso foxygen }}{1 \text { moleof } \mathrm{H}_2 \mathrm{CO}_3}=[/tex]0.0711 moles of oxygen atoms

The 0.0237 moles H₂CO₃ contains 0.0711 moles of oxygen atoms.

The number of moles of oxygen atoms present in a 24.1 moles sample of CO₂ can be determined by:

[tex]24.1\text { molesofC } \mathrm{CO}_2 x \frac{2 \text { moleso foxygen }}{1 \text { moleof } \mathrm{CO}_2}[/tex]=48.2 moles of oxygen atoms

The 24.1 mol CO₂ contains 48.2 moles of oxygen atoms.

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The masses of each of the substances after the reaction is;

Let us recall that the limiting reactant is the reactant that is present in the least amount that is possible. This implies that  once the limiting reactant is exhausted, then the reaction would have to come to a stop.

Now;

Number of moles of iron III oxide = 960 g/160 g/mol = 6 moles

Number of moles of CO = 420 g/28 g/mol = 15 moles

Now;

1 mole of iron III oxide reacts with 3 moles of CO

x moles of iron III oxide reacts with 15 moles of CO

x = 1 mole * 15 moles / 3 moles

= 5 moles

Hence iron III oxide is the excess reactant

It the follows that;

Mass of iron;

If 3 moles of CO produced 2 moles of Fe

15 moles of Co would produce 15 moles * 2 moles /3 moles = 10 moles

Mass of Fe = 10 moles * 56 g/mol = 560 g

Mass of carbon dioxide

3 moles of CO produced 3 moles of carbon dioxide

Mass of carbo dioxide =  15 moles * 44  g/mol = 660 g

Mass of iron III oxide left over;

1 mole * 160 g/mol = 160 g

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The label of a bag of potato chips that contains 20 chips using calorimetry will be 400,000J.

Calorimetry is the science of measuring the heat absorbed or evolved during the course of a chemical reaction or change of state.

A bomb calorimeter is a type of constant-volume calorimeter in which material is burned to measure its heat content.

According to this question, a bomb calorimetry measurement indicates that a single potato chip has a heat content of 20,000J. This amount is specifically for only one chip, hence, the amount of multiple chips can easily be calculated as follows:

Heat energy of 20 chips = 20,000J × 20 chips

Heat energy of 20 chips = 400,000J

Therefore, 400,000J of energy will be on the label bag.

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There's approximately 15.8 g of NaOCl in a cup of bleach. To calculate this we need to use the molarity of the bleach solution and the molar mass of sodium hypochlorite.

In order to convert the molarity to mass, we need the molar mass of sodium hypochlorite. We can calculate it by adding up the relative atomic masses of sodium (23), oxygen (16), and chlorine (35.5):

M (NaOCl) = (23 + 16 + 35.5) g/mol = 74.5 g/mol

Now we calculate the amount (in moles) of sodium hypochlorite present in 250 mL (0.25 L) of bleach:

c = n/V ⇒ n = c*V = 0.850 M * 0.250 L = 0.2125 mol of NaOCl

Using the molar mass, we can now calculate the mass required:

n = m/M ⇒ m = n*M = 0.2125 mol * 74.5 g/mol = 15.8 g of NaOCl

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0.003 moles of NaOH was used in the titration.

The concentration of an identified analyte can be found using a simple laboratory technique called titration. As a standard solution with a given concentration and volume, a reagent known as the titrant or titrator is created.

By using a solution with a known concentration to measure the concentration of an unknown solution, this process is known as titration. To a known volume of the analyte (the unknown solution), the titrant (the known solution) is typically added from a buret until the reaction is finished. To ascertain the unknown concentration of an identifiable analyte, titration, commonly referred to as titrimetry, is a widely used quantitative laboratory analytical technique (Medwick and Kirschner, 2010). Volume measurements are a crucial component of titration

Concentration in mol/dm3 =

Amount of solution mol

= concentration in mol/dm3 × volume in dm3

Amount of sodium hydroxide

= 0.100 × 0.0250

= 0.00250 mol

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A negatively charged core nucleus and one or more orbiting negatively charged electrons make up an atom. Neutrons and positively charged protons are present.

A gas has 6.023 * 10 23 atoms per mole.

The order is -

sulfur hexafluoride > Hydrogen > carbon dioxide  > nitrogen gas > helium gas

The inorganic compound sulphur hexafluoride, has the formula SF6. It is a gas that has no colour, no smell, is not combustible, and is not harmful. The octahedral geometry of SF 6 is made up of six fluorine atoms attached to one another.

The letter H and atomic number 1 stand in for the chemical element hydrogen. The lightest element is hydrogen. Hydrogen is typically a gas with the formula H2 made up of diatomic molecules. It is very combustible, tasteless, colourless, odourless, and non-toxic.

The molecules that make up carbon dioxide each have one carbon atom covalently doubly bonded to two oxygen atoms. It's a gas when it's at room temperature.

Nitrogen is the name of the chemical element that has the letter N and the atomic number 7. It is a common element in the universe and is thought to rank ninth in terms of overall abundance in both the Milky Way and the Solar System.

Chemical element helium has the atomic number 2 and the symbol He. It is the first member of the noble gas group in the periodic table and is a colourless, odourless, tasteless, non-toxic, inert, monatomic gas.

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Answer:

I don't understand much that I need to know more

The equations of the reaction are given below:

The mass in grams of ethanol present at the beginning of the reaction was 196.0 g to four significant figures.

The equation of the reaction of the combustion of ethanol is given below as follows:

The unbalanced  equation: C₂H₅OH + O₂ ---> CO₂+ H₂O

The balanced  equation:  C₂H₅OH + 3 O₂ ---> 2 CO₂+ 3 H₂O

The mole ratio of ethanol to water is 1 : 3

Considering the given question:

If 230.0 g of H2O is produced during the combustion of ethanol, how many grams of ethanol were present at the beginning of the reaction?

The mass of water produced depends on the mass of ethanol present.

The molar mass of water, H₂O =  2 * 1 + 16 = 18.0 g/mol

The molar mass of ethanol, C₂H₅OH = 12 * 2 + 1 * 6 + 16 = 46 g/mol

Mole of water produced = 230 / 18 = 12.78 moles

Moles of ethanol reacted = 12.78 / 3

Moles of ethanol reacted = 4.26 moles

Mass of ethanol reacted = 4.26 * 46

Mass of ethanol reacted = 195.96 g

Mass of ethanol reacted = 196.0 g to four significant figures

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According to the Van’t Hoff factor, 0.01M [tex]ZnCl_2[/tex] will have the lowest freezing point.

The difference between a substance's concentration as determined by its mass and the concentration of particles that are actually formed when it dissolves is known as the Van 't Hoff factor, or i.

The quantity of ions that are produced during the dissolution of an ionic substance is the ideal Van 't Hoff factor.

According to Van’t Hoff factor, i, NaCl = 2

Therefore, 2 x 0.01 = 0.02M

According to Van’t Hoff factor, i, [tex]ZnCl_2[/tex] = 3

Therefore, 3 x 0.01 = 0.03M

ΔT = i x m x Kf

Higher the concentration of the particles, the lower the freezing point will be.

Therefore, 0.01M [tex]ZnCl_2[/tex] will have the lowest freezing point among the two solutions.

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Answer:

The ion will repel the substance because it has more electrons than protons.

Explanation:

there are more electrons (negative) than protons (postitive)

Answer: 2

Explanation: Every non-zero digit is a significant digit.

Answer:

2 significant figures.

Explanation:

38 contains 2 significant figures.

According to the solving the density of the marble is:

D = 2.5 g/cm^3

The amount of mass that a substance has per unit volume is known as its density. If two materials occupy the same volume, the one with a higher density would weigh more than the one with a lower density.

Utilizing the density formula is another approach to determining an object's weight-to-volume ratio. Since you only need to perform one operation to find it, the computation is not too difficult.

The density formula is as follows:

D = m / v,

where:

D - density;

m - mass; and

v - volume.

m - 5grams

v - 2cm

D -

Putting the value in the formula we get:

D = 5/ 2,

D = 2.5 g/cm^3

According to the solving the density of the marble is:

D = 2.5 g/cm^3

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SO32-(aq) ==> SO42-(aq)  ...  unbalanced

SO32-(aq) + H2O ==> SO42-(aq) ...  balanced for O

SO32-(aq) + H2O + 2OH- ==> SO42-(aq) + 2H2O  ...  balanced for O and H using base OH-

SO32-(aq) + H2O + 2OH- ==> SO42-(aq) + 2H2O + 2e-  ...  balanced for O, H and charge = balanced equation

What is half-reaction?

Half-reaction is the oxidation or the reduction reaction of a redox reaction. The oxidation is given as the loss of electrons, and reduction is given as the gain of electrons.

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A scientists is scientific knowledge established through direct observation and remains constant. Scientific knowledge can change with facts and conduct of experiment.

Scientific theories that have been accepted for a long time may change throughout time. Changes in societal, political, or religious ideas could occur together with new scientific discoveries. To obtain a deeper understanding, students should perform historical research on the era when scientific theories were developed.

Observations and supporting data are the basis of scientific understanding. It could change as new facts and observations are discovered. Examining recent discoveries will advance science.

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Answer:

It is a neutralization reaction.

Answer: supercalifragilisticexpialidocuos

Explanation:

Answer:  a large number of plants with a small number of carbon sources.  

Explanation:  the Formula for photosynthesis is

6CO2 + 6H2O → C6H12O6 + 6O2

So to use the carbon dioxide from the atmosphere to produce sugar and oxygen the more the atmosphere CO2 is available rather than other sources of carbon would allow plants to fully utilize the CO2 in the atmosphere.  

a large number of plants would use more CO2 than a small number of plants.  

1) This is an Anion

2) This is a Cation

3) It is Neutral.

Atom: A chemical element is uniquely defined by its atoms, which are tiny pieces of substance. An atom is made up of a core nucleus and one or more negatively charged electrons that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present.

1) number of protons = 7

So, the atomic number = 7

N has an atomic number of 7.

charge = number of proton - number of electrons

= 7 - 10

= -3

So, this is an anion

symbol: N3-

atoms or ion: anion

number of protons = 7

number of electrons = 10

2) charge = +3

Pd has an atomic number of 46.

number of protons = 46

charge = number of proton - number of electrons

+3 = 46 - number of electron

number of electron = 43

since the charge is positive it is a cation

symbol: Pd3+

atoms or ion: cation

number of protons = 46

number of electrons = 43

3) number of protons is 28

So, the atomic number is 28

Ni has an atomic number of 28.

since it is neutral,

number of electron = number of proton = 28

symbol: Ni

atoms or ion: neutral atom

number of protons = 28

number of electrons = 28

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Answer:

concentrated solar energy

Explanation:

Solar thermal power systems use concentrated solar energy

All solar thermal power systems have solar energy collectors with two main components: reflectors (mirrors) that capture and focus sunlight onto a receiver.

Going by the remnant charge, if a negatively charged substance is brought near the ion, an attraction will take place. The ion will attract the substance because the ion has more protons than electrons.

According to established law, substances with like charges repel one another while those with unlike charges tend to attract.

Considering the ion in question, there are 3 positive and 2 negative charges. This means that the ion has one remnant positive charge. In other words, the ion has more protons than electrons.

If a substance that is negatively charged is brought near the ion, an attraction will take place. This is because both the ion and the substance have unlike charges.

In summary, there will be an attraction between the ion and the substance because the ion has more protons (positive charges) than electrons (negative charges).

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Answer:

The ion will repel the substance because the ion has more protons than electrons.

Explanation:

Because the ion has more protons than electrons the ion will repel the substance :)

Chemical element chlorine has the atomic number 17 and the symbol Cl. The second-lightest halogen, fluorine is situated between bromine and fluorine in the periodic table and has most of its features in the middle of those two elements. Chlorine is an odorless, yellow-green gas at room temperature.

Chlorine is found in nature in the ratios of 75.53% and 24.47% as the isotopes "CI35" (atomic mass = 34.969 amu) and "CI37" (atomic mass = 36.966 amu). The atomic masses of the two chlorine isotopes are 35 u and 37 u.

The two chlorine isotopes, 35Cl and 37Cl, have a respective ratio of 3:1.

Cl-37 atoms has a total of 37 nucleons—17 protons and 20 neutrons—make up its nucleus. Natural chlorine is composed of chlorine-37, which makes up 24.23%, and chlorine-35, which makes up 75.77%. This gives chlorine atoms in bulk an apparent atomic weight of 35.453(2) g/mol.

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The number of electrons can be predicted in a neutral atom  because the number of protons and electrons in a neutral atom will be identical, we can readily calculate the electron number from the atomic number.

An atom's atomic number can be used to forecast its electrical structure. The atomic number can be used to forecast the total number of electrons because neutral atoms have an equal number of protons and electrons.

So, If you know what group the atom's element belongs to and the group number correlates to the number of electrons on the valence shell and you can determine how many atoms are on the atom's valence shell.

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Based on the number of particles involved and the enthalpy of the reaction, changes that would shift the equilibrium to the right would, according to Le Chatelier's principle, include increasing the volume of the system, reducing the pressure of the system, reducing the temperature of the system, increasing the concentration of ammonia and/or oxygen and reducing the concentration of NO and/or water. Changes in the opposite direction would cause the equilibrium to shift towards the reactants.

Upon increasing pressure or reducing volume, the equilibrium shifts in the direction that produces fewer gaseous particles. In this case, that's the reactants (9 molecules) and not the products (10 molecules). When considering temperature, it is useful to consider heat as one of the reaction components. When the enthalpy of the reaction is negative, heat is produced so it can be considered to be one of the products. Le Chatelier's principle states that upon changing one of the variables, the equilibrium will shift in the direction that counteracts the effects of the change. So, when reducing the temperature of the system, we are taking the heat out of the system, so equilibrium will shift to the products so that it can produce more heat, and vice versa. The same principle applies to the concentrations of ammonia, oxygen, water, and NO.

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[tex]\quad \huge \quad \quad \boxed{ \tt \:Answer }[/tex]

[tex]\qquad \tt \rightarrow \:7 [/tex]

____________________________________

[tex] \large \tt Solution \: : [/tex]

Iodine (I) has 7 electrons in its outermost shell, so the lewis dot symbol for I has 7 dots ( representing 7 valance electrons )

Answered by : ❝ AǫᴜᴀWɪᴢ ❞

The alum produced during experiment for every 210 can is 38.21 kg

Experiment can be defined as a technique used to establish or refute a hypothesis, or to determine the efficacy or likelihood of anything new.

It can also be defined as a series of acts and observations carried out in the context of attempting to solve a specific problem or question.

According to your experiment 0.4996 gram of aluminum will produce 5.183 grams of alum.

Mass of 1 aluminum can = 13.5 g

Mass of 210 can = 13.5 x 210 = 2835g

Mass of alum produced by one gram of aluminum = 13.48 g

Mass of alum produced by 2835 g = 13.48 x 2835

                                                          = 38.21 kg

The amount of alum produced by 210 can = 38.21 kg

Thus, the alum produced during experiment for every 210 can is 38.21 kg

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