Chemistry High School

0.50 moles of gas take up 10.5 L
of space under constant pressure
and temperature conditions.
What volume is required to hold
2.0 moles of the gas?

Answers

Answer 1

Answer:

The volume required to hold 2 moles of the gas is 42 L

Explanation:

By setting up mole and volume ratio:

moles : volume

0.50 : 10.5

2.0 : X

thus X would be equal to:

(2.0 x 10.5)/0.50

= 21/0.50

= 42 L

Answer 2

Answer: 42

Explanation:

Related Questions

what chemical is produced when the protein from food is broken down?

Answers

The chemical produced when the protein from food is broken down are amino acids.

Amino acids are defined as the substances that are considered to be the monomers of proteins.Every amino acid has the same structure which consists of a central carbon that is binded to an amino group , carboxyl group and a hydrogen.

Each amino acid also has an another atom or a group of atoms which is bonded to the alpha carbon which are also known as the R group or the variable group of the side chain.There are 20 amino acids that are present in natural proteins and each amino acid has the same backbone.

Proteins are present in food and are made up of amino acids.Thus,amino acids are produced when the protein from food is broken down.

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Biannaca Whiteside
Ms. Stephens
Advanced Adult Health
24 February 2022
Case Study 11
J. is a 50-year-old married woman with a genetic autoimmune deficiency; she has had recurrent infective endocarditis. The most recent episodes were a Staphylococcus aureus infection of the mitral valve 16 months ago and a Streptococcus viridans infection of the aortic valve 1 month ago. During the latter hospitalization, an echocardiogram showed moderate aortic stenosis, moderate aortic insufficiency, chronic valvular vegetations, and moderate left atrial enlargement. Two years ago, J. received an 18-month course of total parenteral nutrition (TPN) for malnutrition caused by idiopathic, relentless nausea and vomiting (N/V). She has had coronary artery disease for several years and, 2 years ago had an acute anterior wall myocardial infarction (MI). In addition, she has a history of chronic joint pain. Now, after having been home for only a week, J. has been readmitted to your floor with endocarditis, N/V, and renal failure. Since yesterday, she has been vomiting and retching constantly; she also has had chills, fever, fatigue, joint pain, and headache. As you go through the admission process with her, you note that she wears glasses and has a dental bridge. Intravenous (IV) access is obtained with a double lumen peripherally inserted central catheter (PICC) line. Other orders and your assessment are shown in the box.
Chart View
Admission Orders
STAT blood cultures (aerobic and anaerobic) × 2, 30 minutes apart STAT CMP & CBC Begin PN at 85 mL/hr Piperacillin sodium/tazobactam sodium (Zosyn) 2 g q6h Vancomycin (Vancocin), renal dosing per pharmacy, IVPB q12h Furosemide (Lasix) 80 mg PO daily Amlodipine (Norvasc) 5 mg PO daily Potassium chloride (K-Dur) 40 mEq PO daily Metoprolol (Lopressor) 25 mg PO bid Ondansetron 4 mg IV every 6 hours PRN Transesophageal echocardiogram ASAP
Admission Assessment
Blood pressure 152/48 (supine) and 100/40 (sitting) Pulse rate 116 beats/min
Respiratory rate 22 breaths/min
Temperature 100°F (37°C) Oriented × 3 to person, place and time, but drowsy Grade II/VI holosystolic murmur and a grade III/VI diastolic murmur Lungs clear bilaterally Abdomen soft with slight left upper quadrant tenderness Multiple petechiae on skin of arms, legs, and chest; splinter hemorrhages under the fingernails; hematuria noted in voided urine
1. Which of these statements about IE are true? Select all apply.
a. IE may affect the heart valves. b. IE is an inflammation of the pericardial sac. c. IE is an infection of the innermost layer of the heart. d. Cardiac tamponade is a common complication of IE. e. Heart failure, sepsis, and dysrhythmias may occur with IE

Answers

Cardiac tamponade is a common complication of IE, which can affect the heart valves and is an infection of the heart's innermost layer. It is true that heart failure, sepsis, and dysrhythmias can develop with IE.

When blood or fluid accumulates between the heart muscle and the outer covering sac (pericardium), it puts pressure on the heart and causes cardiac tamponade. Cardiac tamponade may happen because of: cutting open an aortic aneurysm (thoracic) terminal lung cancer. chest pain (acute MI). An abnormal or irregular heartbeat is known as a cardiac dysrhythmia (arrhythmia). A dysrhythmia can cause your heart to beat too quickly or too slowly. Another possibility is that your heart's rhythm is disturbed, giving you the impression that a beat has skipped. Your heart may beat excessively rapidly, or too slowly, or with an uneven pattern (tachycardia).

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how many grams of aluminum bromide are formed from the reaction of aluminum and hydrogen bromide if you have excess al and 121 g of hbr

Answers

The reaction of aluminum and hydrogen bromide will form 212.44 grams of aluminum bromide.

The chemical equation for the reaction between aluminum and hydrogen bromide is:

[tex]2 Al + 3 HBr[/tex] →[tex]Al_2Br_6[/tex]

From this equation, we can see that the reaction is a stoichiometric reaction, which means that the ratio of the reactants and products is fixed and is determined by the coefficients in the balanced equation.

If we have 121 grams of hydrogen bromide, the number of moles of hydrogen bromide can be calculated using the molar mass of hydrogen bromide ([tex]HBr[/tex]) which is approximately 80.9 g/mol. So:

121 g [tex]HBr[/tex] / 80.9 g/mol = 1.49 mol [tex]HBr[/tex]

Since the coefficient of hydrogen bromide in the balanced equation is 3, we know that for every one mole of aluminum, we need 3 moles of HBr. So, in this case, we have excess [tex]Al[/tex], which means the limiting reactant is [tex]HBr[/tex], and we have 1.49 moles of [tex]HBr[/tex].

The number of moles of aluminum bromide ([tex]Al_2Br_6[/tex]) formed can be calculated by dividing the number of moles of [tex]HBr[/tex] by the coefficient of [tex]HBr[/tex] in the balanced equation, which is 3

1.49 moles [tex]HBr[/tex] / 3 = 0.497 moles [tex]Al_2Br_6[/tex]

We can calculate the number of grams of aluminum bromide by multiplying the number of moles by the molar mass of aluminum bromide, which is approximately 427.3 g/mol

0.497 moles [tex]Al_2Br_6[/tex] * 427.3 g/mol = 212.44 g [tex]Al_2Br_6[/tex]

So, the reaction of aluminum and hydrogen bromide will form 212.44 grams of aluminum bromide.

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On periodic tables, does the atomic number go on top of the symbol or does the mass number go on top?

Answers

Answer: yes the atomic number goes on top of the symbol or does the mass number go on top

Explanation: yes the atomic number goes on top of the symbol or does the mass number go on top

you are give a 2.00 g sample of caso4 xh20. given that the mass of anhydrous salt was 1.038 g, find the value of x in the sample.

Answers

The molar mass of hydrate part present in the sample of calcium sulfate is 0.962 g.

What is molar mass?

Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.

Value of mass of water= mass of calcium sulfate-mass of anhydrous form=2.00-1.038=0.962 g.

Thus, The molar mass of hydrate part present in the sample of calcium sulfate is 0.962 g.

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Give the chemical symbol for the element with the following ground state electron configuration. [Ar]4s^2 3d^2

Answers

The chemical symbol for the element Ti for the given ground state electron configuration. [Ar]4s² 3d²

How do you determine the configuration of an electron?

Electron arrangements around an atom's nucleus are known as electron configurations. As an illustration, lithium's electron configuration, 1s²2s₁, indicates that the metal has two electrons in the 1s subshell and one electron in the 2s subshell.

The shell number (n) is the first symbol used to represent an electron configuration, followed by the type of orbital and the superscript number of electrons in the orbital. Consider this: The periodic table shows that oxygen has eight electrons.

chemical symbol: Ti

name: titanium

4s²:

n = 4

l = 0

ml= 0

3d²:

n = 3

l = 2

ml= -2,-1,0,+1,+2

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How could electrical energy be generated by nuclear fission?

Answers

Answer:

generates heat to produce steam, which is used by a turbine generator

Explanation:

write the common and systematic (IUPAC) names of the ether that has the following structure
CH3---O---CH2CH3
Common name: ____
Systematic name: ____

Answers

An ether is methoxybutane. Alkoxy alkanes are the term for ethers. The alkoxy group includes the lower alkyl group. There are two alkyl groups in methylbutane. methyl

Is polar ch3coch2ch3?

The C-H bonds in CH3CH2CH3 have a relatively modest dipole moment and weak dipole-dipole forces because hydrogen and carbon have very similar electronegativities.

In water, CH3NH3Cl + HCl will entirely dissociate to form 2 mol L-1 ions. Or less 1 mol L-1 of ions will only be partially produced by CH3NH2's reaction with water. written last: CH3NH2.

What is CH3CH2NH2's conjugate base?

Sequence of acidity: CH3SH > (CH3)2PH > HCl (strongest acid) (weakest acid). In contrast to the conjugate acid of the amide, the nucleophile of CH3CH2NH2 (ethylamine) does indeed have a single resonance contributor.

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calculate the molar mass of tetraphosphorus decaoxide, p4o10, a corrosive substance which can be used as a drying agent.

Answers

As a result, the molecular mass of P₄O₁₀, or tetraphosphorus decaoxide, is 284 g/mol.

What is molecular mass?

The molecular mass is the mass of all the atoms present in the molecule. The molecular mass of the compound is calculated using the steps:

Determine the atomic number of each element in the compound.

Each element's atomic mass is multiplied by the number of atoms in that element in the compound.

The mass of all the atoms are added up.

Here,

The given compound is:

P₄O₁₀

The atomic mass of P=31 u

The atomic mass of O=16 u

The molecular mass of P₄O₁₀,

=31*4+16*10

=124+160

=284 g/mol

Hence, the molecular mass of P₄O₁₀ that is tetra phosphorus decaoxide is 284 g/mol .

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for kw, the product of [h3o+] and [oh-] is_____

Answers

The product of [H₃O⁺] and [OH⁻] is calculated as1 × 10⁻¹⁴.

What is Kw?

Ionization constant of water, Kw is the product of [H₃O⁺] and [OH⁻].In the autoionization of water, proton is transferred from one water molecule to another to produce hydronium ion (H₃O⁺) and hydroxide ion (OH⁻).

The equilibrium expression for the reaction is Kw = [H₃O⁺][OH⁻], where Kw is the autoionization constant of water.

As, Kw = [H₃O⁺][OH⁻]

In pure water, [H₃O⁺] = [OH⁻] = 1 × 10⁻⁷

So, Kw = [H₃O⁺][OH⁻] = 1 × 10⁻⁷ × 1 × 10⁻⁷

Thus, Kw = [H₃O⁺][OH⁻] = 1 × 10⁻¹⁴

Hence, we get the product of [H₃O⁺] and [OH⁻] is 1 × 10⁻¹⁴.

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Salicylic acid (C7H6O3) reacts with acetic anhydride (C4H6O3) to form acetylsalicylic acid (C9H8O4). 2C7H6O3(aq) C4H6O3(aq) Right arrow. 2C9H8O4(aq) H2O(l) What is the limiting reactant if 70.0 g of C7H6O3 and 80.0 g of C4H6O3 react

Answers

We have only 0.5 mol of C₇H₆O₃, so we don't have enough amount of salicylic acid, therefore, salicylic acid acts as limiting reactant.

What are reactants that are limiting?

In a chemical reaction, the amount of product that can be formed is limited by the limiting reactant, also known as the limiting reagent, which is the reactant that is consumed first.

It is helpful to convert the masses of reactants into moles in order to comprehend what the limiting reactant is. These are the molecular masses:

C₇H₆O₃ = 138g/mol

C₄H₆O₃ = 100g/mol

Making moles out of masses:

70g C₇H₆O₃ 1mol/138g = 0.5 mol C₇H₆O₃

80g C₄H₆O₃ 1mol/100g = 0.8 mol C₄H₆O₃

In the reaction, 2 moles of C₇H₆O₃ are necessary to react with 1 mol of

C₄H₆O₃ Following this ratio:

0.8 mol C₄H₆O₃ . 2 moles of C₇H₆O₃/ 1 mol of C₄H₆O₃ = 1.6mole C₇H₆O₃

We have only 0.5 mol of C₇H₆O₃ i.e, we don't have enough amount of salicylic acid, therefore, this is the limiting reactant.

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at what point in processing do you apply photometric calibration or spectrometric color calibration in pixinsight?

Answers

The camera incorporates all of the light which each filters transmits when we measure colour using photometric methods.

What is the purpose of photometry?

In chemistry, photometry is frequently used to study solutions and liquids. Masses of synthetic or natural components in a mixture or liquid can be measured with the aid of photometers. Applying filters to limit some wavelengths while allowing another desired wavelength to pass allows for the use of photometry in astronomy.

What is the photometric principle?

Photometry is the measuring of light absorption in the UV, VIS, and IR wavelength ranges. To calculate the concentration of analyte in a solutions or liquid, utilise this measurement.

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Explain what is wrong with each of these statements

Answers

An aluminium ion looses two electron to form a negative ion.

The formula of carbonate is Co₃⁻².

What is ion ?

The term ion is define as any atom or group of atoms that have one or more positive or negative electrical charges. There are two types ion cation and anion.

One lithium atom is react with two fluorine atom to formed lithium fluoride.

Ionic bonds are stronger than covalent bond.

The charge on the barium ion is +2.

When gas turns into liquid its particle get smaller.

Lithium fluoride is a mixture because it contains more than two element.

In an atom the number of electron is equal to the number of proton.

The complete shell contains eight electrons in it.

In the periodic table, elements in the same group does not have the same electron in their outermost shell.

Thus, An aluminium ion looses two electron to form a negative ion.

The formula of carbonate is Co₃⁻².

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What would be the advantages of using Al(OH)3 as an antacid rather than NaHCO3, which undergoes the following reaction with stomach acid?

NaHCO3(aq) + HCl(aq) →→→→ NaCl(aq) +
H₂O(l) + CO₂(g)

Answers

Answer:

Aluminum hydroxide (Al(OH)3) has several advantages over sodium bicarbonate (NaHCO3) as an antacid. One advantage is that Al(OH)3 does not neutralize stomach acid as quickly as NaHCO3 does, so it can provide longer-lasting relief for symptoms of heartburn and indigestion. Additionally, Al(OH)3 is less likely to cause side effects such as diarrhea, which can be a common problem with overuse of NaHCO3. Furthermore, Al(OH)3 can also adsorb excess stomach acid and form a physical barrier that helps to protect the stomach lining.

3 ba(clo3)2 + 1 al2(so4)3 - 3 basoa + 2 al(clo3)3
what is the percent yield of a reaction that was expected to yield 45.8 grams of baso, and
yielded 38.4 grams of baso?

Answers

The percent yield of reaction is calculated as 83.67%, which implies that 83.67% of expected amount of Baso was actually produced.

What is percent yield of a reaction?

The actual yield divided by theoretical yield times 100 is percent yield.

Theoretical yield of Baso will be calculated as :

As, we know, molar mass of Baso = 234.17 g/mol

So, now moles of Baso is (45.8 g Baso) / (234.17 g/mol) = 0.196 mol Baso

Actual yield of Baso will be:

As we know, molar mass of Baso = 234.17 g/mol

So, now moles of Baso is (38.4 g Baso) / (234.17 g/mol) = 0.164 mol Baso

As we know, Percent yield is (Actual yield/Theoretical yield) x 100

= (0.164 / 0.196 ) x 100

So, the Percent yield is 83.67%

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where in an infrared (ir) specwhich region best matches a typical ir spectrum?trum would you find a strong c

Answers

The region around 3,000 to 4,000 cm⁻¹ is the region for most organic compounds, where the C-H stretching vibration is found.

What is organic compounds?

Organic compounds are molecules that contain carbon and hydrogen atoms, and sometimes other atoms such as oxygen, nitrogen, sulfur, and phosphorous. Organic compounds are essential for life and are found in a variety of living organisms, including plants and animals. Organic compounds are also found in many non-living objects, such as petroleum and coal. Organic compounds are important because they are used to create energy, medicine, plastics, and many other useful materials. Organic compounds are made up of different combinations of elements, including carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus.

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When sodium is heated, a yellow spectral
line whose energy is 3.37 x 10-19 j per photon is
produced
what is the frequency of this light?
explain please

Answers

Sodium is heated, a yellow spectral line whose energy is 3.37 x 10-19 j per photon is produced. The frequency of this light is 5.08 x 10^14 Hz

The frequency of light can be calculated using the equation: frequency (ν) = energy (E) / Planck's constant (h).

In this case, the energy of the photon is given as 3.37 x 10^-19 Joules, and Planck's constant is approximately 6.63 x 10^-34 Joules seconds.

So the frequency of this light would be:

ν = E / h

= (3.37 x 10^-19 Joules) / (6.63 x 10^-34 Joules seconds)

= 5.08 x 10^14 Hz

This is a very high frequency, which corresponds to a very short wavelength, in the ultraviolet range of the electromagnetic spectrum.

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Enter an equation for the formation of NH3(g) from its elements in their standard states Express your answer as a chemical equation including phases. N2(g) + 3H2(g) +2NH3(g)

Answers

The formation of NH3(g) from its elements in their standard states can be represented by the following equation: N2(g) + 3H2(g) --> 2NH3(g).

This equation represents the combination of one molecule of Nitrogen gas (N2) and three molecules of Hydrogen gas (H2) to form two molecules of Ammonia gas (NH3). All the reactants and products are in their gaseous state at standard temperature and pressure.A chemical equation is a written representation of a chemical reaction. It shows the reactants (the starting materials) on the left side of an arrow and the products (the resulting materials) on the right side of the arrow. The arrow represents the transformation of the reactants into products.

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Identify substituents on product E q11 A. 2 x -CO2H group and 1 x -SO3H group B. no substituent, only H C. 2 x -SO3H group and 1 x -CO2H group D. 2 x -SO3H group E. 2 x - CH2CH3 group and 1 x -SO3H group

Answers

Everything is predicated on benzenation, and the replacement location depends on when benzene is in an electron-rich or electron-deficient position.

Who or what is an electron?

A opposite charges new particle known as an electron can either be free or attached to an atom (not bound). Each of the three main types of elements within an element is an electrode that is bonded to it; its other pair are protons plus neutrons.

Where can you find electrons?

Electrons are present outside the atom's nucleus, in contrast to protons and neutrons which are contained from the inside of the nucleus at its center. Negative electrons are drawn to the positively charged nucleus because the electric charges of opposite polarity attract one another.

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What would be the number of phosphorus atoms in a 2.34 g sample of calcium phosphate?

(My answer was 9.1*10^21 but I'm not sure if I went wrong somewhere in the process)

Answers

Answer: You were right I'm not sure why it says you're incorrect?

Explanation:

Final answer:

The number of phosphorus atoms in a 2.34 g sample of calcium phosphate is calculated via molar mass and Avogadro's number. Your estimate of 9.1 x 10^21 phosphorus atoms is very close to the actual atoms present.

Explanation:

To solve this inquiry, let's start by finding the molar mass of calcium phosphate (Ca3(PO4)2). The molar mass is calculated as follows: 3(40.08 g/mole for Ca) + 2(1.01 g/mole for H) + 2(15.999 g/mole for O) + 2(30.974 g/mole for P) = 310.18 g/mole.

Next, divide the mass of the sample by the molar mass of calcium phosphate to find number of moles: 2.34 g ÷ 310.18 g/mole = 0.00754 moles.

Remember that 1 mole of calcium phosphate contains 2 moles of phosphorus atoms. Therefore, the number of moles of phosphorus atoms is 2*0.00754 = 0.01508 moles.

Then, use Avogadro's number (6.02 x 1023 atoms/mole) to find the number of phosphorus atoms: 0.01508 moles * 6.02 x 1023 atoms/mole = 9.08 x 1021 atoms. Your estimate of 9.1 x 1021 phosphorus atoms is essentially correct!

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PLEASE HELP!!
Show the units in the equation:
△G°=-nFE°
are consistent.

Answers

Answer:

Explanation:

In this equation, ΔG° stands for the standard Gibbs free energy of a reaction, n is the number of moles of electrons that are transferred in the reaction, F stands for the Faraday constant (96,485.3 Coulombs/mole), and E° is the standard electrochemical potential. All of these units are consistent, since ΔG° is in Joules, n is in moles, F is in Coulombs/mole, and E° is in volts.

which of the following will affect the total amount of solute that can dissolve in a given amount of solvent? a. the solution is stirred. b. the solute is ground to fine particles before dissolving. c. the temperature changes.

Answers

The greatest amount of a solute that may dissolve in a specific amount of solvent is known as a substance's solubility; this quantity depends on the chemical makeup of both the solute and the solvent as well as on

What elements influence the solubility of a Class 6 solute?

Temperature and pressure are the two direct variables that impact solubility. Pressure solely influences the solubility of gases, but temperature affects the solubility of both solids and gases.

What are the four determinants of solubility?

The four main elements that influence a gas' solubility in a liquid are listed below. Size, chemical reactivity, pressure, and temperature between the liquid and gas. Typically, as the pressure rises, the gas becomes more soluble.

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A substance's solubility is the maximum amount of that substance that may dissolved in a given amount of solvent; this amount relies on the chemical composition of both the solvent and solute as well as on

What factors affect a Class 6 solute's solubility?

Temperature and pressure are the two direct variables that impact solubility. Temperature has an impact here on soluble including both solids and gases, but pressure only affects the gas's solubility.

Which of the four elements that determine solubility?

The below is a list of the four primary factors that affect a gas' soluble in a liquid. Temperature, pressure, size, and chemical reactivity here between liquid and gas Usually, the gas gets more soluble as the pressure increases.

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Draw The Valence Bond Lewis Structure of Ne2^+2. Draw Molecular Orbital Diagram using Shorthand Notation. What is the bond order, number of sigma bonds, number of pi bonds? Is it paramagnetic?

Answers

magnetic quality Ne2 particle does not exist because the bond order is zero. Due to the lack of any unpaired electrons, it is diamagnetic. B2 compound.

A valence bond structure: what is it?

VB Theory Valance Bond The valence bond hypothesis states that rather than occupying molecular orbitals, electrons in molecules do so in atomic orbitals. A chemical bond is created when two atomic orbitals overlap, and this overlapping causes the electrons to be concentrated in the bond region.

What does a Lewis structure bond look like?

Using the model of localized electron bonds Two atoms sharing a pair of electrons results in bonds. Since an orbital may hold two electrons, we typically speak of bonding pairs and lone pairs of electrons.

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at the boiling point, the density of the liquid is 809 g/l and that of the gas is 4.566 g/l. how many liters of liquid nitrogen are produced when 489.0 l of nitrogen gas is liquefied at 77.36 k?

Answers

2.758 L Of liquid nitrogen are produced when gas is liquefied.

We are converting gaseous nitrogen to liquid nitrogen. Both of these substances have different densities. Therefore they will occupy different volumes . But they will have the same mass.

Step 1 : Find mass of nitrogen gas

So let us find out the mass of nitrogen gas occupied by 489 L .

The formula for density is, D = Mass / Volume

Density of nitrogen gas 4.566 g/L and the volume occupied by it is 489 L.

Let us plug in these values to find the mass of nitrogen gas.

The equation can be modified as follows.

Mass = Density × Volume

Mass = 4.566 / L × 489

Mass = 2232g

The mass of nitrogen gas is 2232 g.

Step 2 : Find the volume of a liquid nitrogen using the mass

The mass of a liquefied nitrogen is also the same.

Whereas, the density of liquid nitrogen is 809 g/L

Let us plug in this value of mass to find the volume of the liquid.

Volume = 2232 / 809g / L

Volume = 2.758 L

The volume of liquid nitrogen is 2.758 L

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(6) There are only two elements named after women. Who are the two women? What are the names and the atomic numbers of the elements named after them? What was each woman's contribution to science?

Answers

Curium (Cm) and Rhenium are the two elements with female names (Re).

How were the two elements named after women?

After Marie Curie, a pioneering researcher in the realm of radioactivity, the element curium, with atomic number 96, was named. She was the first person to receive two Nobel Prizes, one each in physics and chemistry, and her work on the discovery of radium and polonium contributed to the advancement of X-ray technology and the development of cancer therapies.

Rhenium, an element with the atomic number 75, was given its name in honour of Ida Tacke-Rhenium, a German scientist who made the discovery of the substance alongside her husband in 1925. The element was found and isolated by her, and it has since been widely employed in high-temperature alloys, catalysts, and electronic parts.

What was each women's contribution to science?

Both of these women made significant contributions to science, and the naming of these elements pays tribute to them. They were pioneers in a male-dominated industry, and their contributions have had a lasting influence on science and technology.

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after 220 million years, how much of a 100-gram sample of uranium-235 would remain, assuming a half-life of 700 million years?

Answers

After 220 million years, The half-life is the time taken for half the mass number of atoms in a sample to decay,700 million years.

What is uranium ?

Uranium is a chemical element represented by the symbol U and the atomic number is 92. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons present in it.

Half-Life is the time for a substance U-235 in this case to decay to 1/2 its original mass. Therefore, the problem is asking for the time for U-235 to decay to 1/2 its original mass 100 grams then the decay time is 1 half-life, or 700 million years.

Thus, After 220 million years, The half-life is the time taken for half the mass number of atoms in a sample to decay,700 million years.

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Balance the following redox reaction in acidic solution: Cu(s)+NO3−(aq)→Cu2+(aq)+NO2(g) Express your answer as a chemical equation including phases.

Answers

The balanced redox reaction in acidic solution is:

Cu(s) + 4H+(aq) + 2NO3-(aq) → Cu2+(aq) + 2NO2(g) + 2H2O(l)

The reaction given is a redox reaction and it needs to be balanced. The reactants and products should have the same number of atoms of each element on both sides of the equation. In the given equation, the number of Copper atoms and Nitrate ions are not balanced on both sides of the equation. In acidic solution, the hydrogen ions (H+) are also present and they also need to be added to the equation. In this case, 4 hydrogen ions and 2 water molecules have been added to the balanced equation to balance the equation.