(5.391 ´ 10-7) + (2.5531 ´ 10-6) =

Answer:

spontaneous

Explanation:

Electrons in a cathode ray tube are produced at the cathode and move towards the anode which is the the positive electrode.

This flow of electrons is spontaneous because electrons flow from a point of negative electric potential to a point of positive electric potential, hence the answer above.

Explanation:

What type of bond forms in iron (II) chloride?

Answer:

Lewis structure in attachment.

Explanation:

Atoms of elements in and beyond the third period of the  periodic table form some compounds in which more than eight electrons surround the  central atom. In addition to the 3s and 3p orbitals, elements in the third period also  have 3d orbitals that can be used in bonding. These orbitals enable an atom to form  an expanded octet.

The central Xe atom in the XeF₄ molecule has two unbonded electron pairs and four bonded electron pairs in its valence shell.

The central Xe atom in the XeF4 molecule has 2 unbonded electron pair(s) and 4 bonded electron pair(s) in its valence shell.

Xenon is the element with the following electronic configuration:

[Kr] 4d¹⁰5s²5p⁶

Thus, The central Xe atom in the XeF4 molecule has 2 unbonded electron pair(s) and 4 bonded electron pair(s) in its valence shell.

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Answer:

a nonspontanenous reaction is forced to occur

Hope this helps :)

Answer:

Tracy was able to remember what her teacher told her to do and she decided to try it,which was the right thing.

But since it's a demonstration then Tracy is supposed to wear all her protective equipments and with a teacher's permission.I hope this helps.Thanks

Answer:

Solubility = [SO₄²⁻]

Explanation:

Solubility of Ag₂SO₄ can be determined by its ksp equilibrium:

Ag₂SO₄(s) ⇄ SO₄²⁻ + 2Ag⁺

Where 1 mole of silver sulfate dissolves producing 1 mole of sulfate ion and 2 moles of silver ion.

Solubility is defined as the amount of solid that can be dissolved per liter of solution.

The moles of Ag₂SO₄ dissolved are equal to moles of SO₄²⁻.

That means:

Answer:

rate = k ×[H₂] × [I]²

Explanation:

Write the rate law for the following elementary reaction: H₂(g) + 2 I(g) → 2 HI(g) Use k, to stand for the rate constant.

Step 1: Write the elementary reaction

H₂(g) + 2 I(g) → 2 HI(g)

Step 2: Write the rate law

The generic rate law is

rate = k ×[H₂]ᵃ × [I]ᵇ

where,

rate: reaction rate

k: rate constant

[H₂] and [I]: molar concentrations of the reactants

a and b: reaction orders for H₂ and I, respectively

For elementary reactions, the reaction orders coincide with the stoichiometric coefficients. Then, the rate law is:

rate = k ×[H₂] × [I]²

Answer:

1 Gram (g) is equal to 10 decigrams (dg).

Explanation:

this is because there is 0.1 grams in a decigram

Answer:

b) maintains the pH of blood near 7.4.

c) regulates the blood pH at 7.4 +/- one pH unit.

f) is facilitated by the enzyme carbonic anhydrase, which interconverts carbon dioxide and water to carbonic acid (ionizes into bicarbonate and H^+).

Explanation:

The pH of human blood is slightly acidic i. e. 7.4. The enzyme carbonic anhydrase is responsible for the regulation to neutral and prevent it from acidic. the enzyme carbonic anhydrase helps in the conversion of carbon dioxide to carbonic acid and bicarbonate ions. When the blood reach to lungs, the bicarbonate ions convert back to CO2 and this carbondioxide is exhaled from the body.

Answer: A:Physical, B:Both, C: Chemical

Explanation:

Tearing paper is physical because only the appearance has changed. Melting wax can be either physical or chemical depending on whether the wax actually burns or not, burning a log is chemical because new substances are formed when wood burns.

Answer:

.085 M .

Explanation:

  3A(g)   +4B(g)  ⇋  5C(g)

4 moles of B reacts with A to form 5 moles of C

.068 moles of B will reacts with A to form  5 x .068 / 4 moles of C

Moles of C formed

= 5 x .068 / 4

= .085 moles .

Answer:

See figure 1

Explanation:

If we want to find the acid and the Brønsted-Lowry base, we must remember the definition for each of these molecules:

-) Acid: hydrogen donor

-) Base: hydrogen acceptor

In the caffeine structure, we have several atoms of nitrogen. These nitrogen atoms have the ability to accept hydronium ions ([tex]H^+[/tex]). Therefore the caffeine molecule will be the base since it can accept

If caffeine is the base, the water must be the acid. So, the water in this reaction donated a hydronium ion.

Thus, caffeine is the base and water the acid. (See figure 1)

In the reaction of caffeine with water, H₂O and C₈H₁₁N₄O₂⁺ are Brønsted-Lowry acids while C₈H₁₀N₄O₂ and OH⁻ are Brønsted-Lowry bases.

Caffeine reacts with water in an acid-base reaction. We want to identify acids and bases according to Brønsted-Lowry theory.

It is a theory that classifies substances as acids and bases according to their behavior in a reaction.

The chemical equation for the acid-base reaction between caffeine and water is:

C₈H₁₀N₄O₂ + H₂O ⇄ C₈H₁₁N₄O₂⁺ + OH⁻

C₈H₁₀N₄O₂ accepts a H⁺ so it is a base while H₂O donates a H⁺ so it is an acid. This reaction is reversible, so we can also state that C₈H₁₁N₄O₂⁺ is an acid because it donates a H⁺ and OH⁻ is a base because it accepts a H⁺.

In the reaction of caffeine with water, H₂O and C₈H₁₁N₄O₂⁺ are Brønsted-Lowry acids while C₈H₁₀N₄O₂ and OH⁻ are Brønsted-Lowry bases.

Learn more about Brønsted-Lowry acid base theory here: https://brainly.com/question/7256753

Answer:

42.857 seconds

Explanation:

Given that:

The average adult heart pumps about 84./mLs  of blood at 72 beats per minute.

The total volume = 3600 mL

The objective is to calculate how long it would take the average heart circulate 3600 mL of blood.

Since 84 mL of blood takes 1 seconds to pump,

assuming q is the time required for heart to pump 3600 mL of blood

[tex]Time \ ( q )= \dfrac{3600 mL \times 1\ seconds}{84 \ mL}[/tex]

TIme (q) = 42.857 seconds

washing dishes only when the dishwasher is full

Answer:

The answer is on the screenshot

Explanation:

Answer: (a) BE = 1.112 MeV

               (b) BE = 7.074 MeV

               (c) BE = 7.767 MeV

               (d) BE = 8.112 MeV

Explanation: Binding energy per nucleon is the average energy necessary to remove a proton or a neutron from the nucleus of an atom. It is mathematically defined as:

[tex]BE = \frac{\Delta m.c^{2}}{A}[/tex]

Where

Δm is a difference in mass known as mass defect

A is atomic mass of an atom.

Mass Defect is determined by:

[tex]\Delta m =Zm_{p}+(A-Z)m_{n} - m_{nuc}[/tex]

where:

Z is atomic number

[tex]m_{p}[/tex] is mass of proton

[tex]m_{n}[/tex] is mass of neutron

[tex]m_{nuc}[/tex] is mass of the nucleus

Mass of proton is 1.007825u.

Mass of neutron is 1.008665u.

The unit u is equal to 931.5MeV/c².

(a) 2H(deuterion): Given: Z = 1; A = 2; [tex]m_{nuc}[/tex] = 2.014102u

[tex]\Delta m =1(1.007825)+1(1.008665) -2.014102[/tex]

[tex]\Delta m =0.002388u[/tex]

[tex]BE = \frac{0.002388.c^{2}}{2}.931.5\frac{MeV}{c^{2}}[/tex]

BE = 1.112MeV

(b) 4He (Helium): Given: Z = 2; A = 4; [tex]m_{nuc}[/tex] = 4.002603

[tex]\Delta m =2(1.007825)+2(1.008665) -4.002603[/tex]

[tex]\Delta m =0.030377u[/tex]

[tex]BE = \frac{0.030377.c^{2}}{4}.931.5\frac{MeV}{c^{2}}[/tex]

BE = 7.074MeV

(c) 18O (Oxygen): Given: Z = 8; A = 18; [tex]m_{nuc}[/tex] = 17.999160

[tex]\Delta m =8(1.007825)+10(1.008665) -17.999160[/tex]

[tex]\Delta m =0.15009u[/tex]

[tex]BE = \frac{0.15009.c^{2}}{18}.931.5\frac{MeV}{c^{2}}[/tex]

BE = 7.767MeV

(d) 23Na (Sodium): Given: Z = 11; A = 23; [tex]m_{nuc}[/tex] = 22.989767

[tex]\Delta m =11(1.007825)+12(1.008665) -22.989767[/tex]

[tex]\Delta m =0.200288u[/tex]

[tex]BE = \frac{0.200288.c^{2}}{23}.931.5\frac{MeV}{c^{2}}[/tex]

BE = 8.112MeV

Answer:

Explanation:

Temperature of gas in absolute scale T = 25 + 273 = 298 .

pressure of gas P = 1.013 x 10⁵ N / m²

density D = 1.799 kg / m³

= 1799 g / m³

From gas formula

PV / T = n R Where P is pressure , V is volume and T is absolute temperature , n is no of moles

P / T = n R / V

P / T = m R /M V where m is mass of gas and M is molecular weight .

m / V = D ( density )

P / T = DR/ M  

PM / DT = R

Putting the values

1.013 x 10⁵ x 44  /  (1799 x 298)

R = 8.314.09 J / K mole

Answer:

As + 3/2 Cl₂ → AsCl₃

Explanation:

The reaction of the problem is:

As + Cl₂ → AsₐClₓ

The problem consist in determine a and x from the formula to write the balanced equation.

1.72g of As are (Molar mass: 74.92g/mol):

1.72g * (1mol / 74.92g) = 0.02296 moles of As are added to the reaction.

As molar mass of the arsenic chloride is between 180-200g/mol, the moles produced are between:

4.17g * (1 mol / 180g) = 0.0232

4.17g * (1 mol / 200g) = 0.0209

As moles of As are 0.02296 the most logic is than 1 mole of As produce 1 mole of the compound, that means the arsenic compound contains 1 mole in each formula:

As₁Clₓ: AsClₓ

And also, 0.02296 moles of AsClₓ are produced, the molar mass is:

4.17g / 0.02296mol = 181.62g/mol.

The atom of As weighs 74.92g/mol. The mass of the chlorides is:

181.62 - 74.92 = 106.70g/mol.

1 atom of Cl weighs 35.45g/mol:

106.70g/mol / 35.45g/mol = 3.0 atoms of Cl are in the chemical formula, that is:

AsCl₃

And the balanced equation for this synthesis is:

As + Cl₂ → AsCl₃

Provided question is incomplete as it lacks image or diagtram related to the question, however the correct indication is attach with answer :

Answer:

The correct answer is : antibonding molecular orbital

Explanation:

At the point when two atomic orbitals can consolidate directly produce two molecualr orbital, of which one is holding sub-atomic orbital of lower vitality and the other antibonding molecular orbital of higher energy.  

Holding molecular orbital would by and large outcomes which nuclear orbitals of same phase joins while antibonding molecular orbital would results when atomic orbitals of various stages can combine.  

In the given approach, it is obvious that one of S - orbital is going consolidate directly with opposite phase of p - orbital along their inter nuclear axis. Subsequently it prompts the formation of sigma antibonding molecular orbital.

Thus, the correct answer is : antibonding molecular orbital

Answer:

= -13.6 eV

Explanation:

E = -13.6 ÷ [tex]\frac{Z^{2} }{n^{2} }[/tex]

where n is the principal state

Z is atomic number

and E is energy in electron volts.

Given that n = 2 and Helium Z = 2

⇒ E = -13.6 ÷ [tex]\frac{2^{2} }{2^{2} }[/tex]

= -13.6 eV

I believe this is helpful and easy to follow.

Answer:

9.368g/mL

Explanation:

The density is defined as the mass of a compound in a determined volume.

Based on Archimedes' law, the volume of the piece of metal is the difference between the volume of the water + the inmersed piece - the original volume of water. That is:

Volume of the metal:

257.5mL - 229.0mL = 28.5mL

As the mass of the metal is 267.0g; its density is:

Density:

267.0g / 28.5mL =

Answer:

The correct answer is "transferred; unequally shared; equally shared".

Explanation:

Ionic bonding occurs when a positively charged atom (cation) interacts with a negatively charged atom (anion). In ionic bonding, the cation transfers its electron to the anion. In polar covalent bonding, electrons are unequally shared. This means that the electrons spend more time in an atom than the other, which gives partial positive and negative charges to the atoms. On the other hand in nonpolar covalent bonding, the electrons are equally shared and no charges are created.

Answer:

2.48x10¹³ miles is the distance from the earth to Proxima Centauri

Explanation:

Light years is an unit of distance used in Astronomy. That is because 1 light year = 9.461x10¹²km; a real big distance used in the science that study the universe.

In km, 4.22 light years are:

4.22 light years * (9.461x10¹²km / 1 light year) = 3.9925x10¹³km

As 1 mile = 1.60934km, this distance in miles is:

3.9925x10¹³km * (1 mile / 1.60934km) =

Answer:

104.5 and 109.5

Explanation:

Bond angle is the angle formed between three atoms which has at least two bonds present between them. The number of lone pairs in a covalent bond is a determinant of the bond angle as the lone pairs which are negatively charged repulses the bond pairs thereby creating a distortion and angle.

Studies have however shown that the bond angles in H3O are lesser than 109.5 and greater than 103.5. This provides a bond range of H3O.

Industrial and organizational psychologists study organizations and their employees to improve the productivity, satisfaction, safety, health and well-being of those within the workplace environment.

Your question has been heard loud and clear.

Well , work productivity is a necessity in all fields of science and businesses especially those dealing with commerce. So , for each of these fields , we have specific psychologists to help with work productivity.

Examples: Aviation Psychologists  (Field of Aviation)

These psychologists study the behavior of pilots and other flight crew members. Aviation psychologists also perform research on airline safety, develop new training equipment, and help select suitable employees.

Biopsychologists  (Field of biology)

These psychologists are also sometimes called biological psychologists or physiological psychologists. They study and perform research on the brain and behavior. By examining the neural bases of behavior, biopsychologists are able to understand different biological factors that might impact how people think, feel, and act.

Educational Psychologists  (Field of education)

These psychologists study how people learn and the educational process. This might involve developing instructional strategies and teaching techniques. Some educational psychologists study giftedness or learning disabilities.

Thank you.

Answer:

The answer to the question is 78

Answer:

78

Explanation:

In rounding off to two, we consider the third digit. if it is more than five we ad one to the second digit otherwise we truncate.

in the case of 77.616, we add one to the second digit and truncate the rest.

Answer: The answer can be found on CHEG

Explanation:

Answer:

D) Measure 58.44g NaCl, dissolve it into 400ml water, and then top off to 500ml in a volumetric flask.

Explanation:

2.00M NaCl is a solution that contains 2.00 moles of NaCl per liter of solution.

As you want to prepare 500mL = 0.500L of the solution you need:

0.500L * (2.00 moles / L) = 1.00 moles of NaCl are required to prepare the solution.

Now, to convert these moles to grams you must use Molar weight (58.44g/mol) as follows:

1 moles of NaCl * (58.44g / mol) = 58.44g of NaCl are required to dissolve in 500mL to prepare the 2.00M solution.

And right option is:

-You can't top off a solution before dissolve all solute because it is possible the volume changes-

Answer:

D) Measure 58.44g NaCl, dissolve it into 400ml water, and then top off to 500ml in a volumetric flask.

Explanation:

I got it right in class!

Hope this Helps!! :))

Answer:

Its a shift of about 200ppm

Explanation:

because we know that a chemical shift explains the resonating frequency of a particular nucleus in relation to its standard as in a magnetic field so that

carbonyl group in aldehydes and ketones is 200ppm