Determine the volume (mL) of 15.0 M sulfuric acid needed to react with 45.0 g of
aluminum to produce aluminum sulfate.

Answer: C

Explanation:

I took a quiz on this.

Answer:

iron i believe is ionic and carbon is covalent

Explanation:

if im wrong correct me

Explanation:

A stethoscope is used to listen to sounds that the heart , lungs , blood flow , intestines make.

412.056524g is present in 2.3×10^24atoms of Ag

Answer:

[tex]\% Fe=11.4\%[/tex]

Explanation:

Hello!

In this case, for the described chemical reaction, we find it is:

[tex]8H^+(aq)+5Fe^{2+}(aq)+MnO_4^-(aq)\rightarrow 5Fe^{3+}(aq)+Mn^{2+}(aq)+4H_2O(l)[/tex]

Because it says that the iron is dissolved in a strong acid which provides addition hydrogen ions to the reaction media. Thus, for the questions attached on the figure we find:

- This a REDOX reaction because we see iron is being oxidized from 2+ to 3+ and manganese reduced from +7 to +2.

- Since it is a redox reaction and the oxidized species is that undergoing an oxidation number increase, we evidence iron goes from +2 to +3, which means iron is the oxidized species.

- In this case, for the used 59.2 mL (0.0592 L) of the 0.2000 M solution of potassium permanganate, we can compute the consumed grams of iron via stoichiometry including the 5:1 mole ratio between them in the chemical reaction:

[tex]m_{Fe^{2+}}=0.0592L*0.2000\frac{molMnO_4^-}{L}*\frac{5molFe^{2+}}{1molMnO_4^-} *\frac{55.85gFe^{2+}}{1molFe^{2+}} \\\\m_{Fe^{2+}}=3.31gFe^{2+}[/tex]

It means that the percent of iron in that sample is:

[tex]\% Fe=\frac{3.31g}{29.00g} *100\%\\\\\% Fe=11.4\%[/tex]

Best regards.

Answer:

its not A B or C soo choose D *This is what i think*

Answer:

A) something that causes physical pain

hope this helps

Explanation:

Answer: 16.21

Explanation:

A student measures the length of two pieces of paper as 8.21 in and 8.0 in. the total length is 16.21 with 4 significant figures.

The significant figures or digits are the form of scientific methd which represent the digit from zero to nine and use when the value is uncertain where starting zeros are not significant and decimal is also not a significant figure.

In the given value the total is 16.21 with 4 significant figures with it has 4 significant digits and the decimal with it is not significant after adding from which the respective value is here.

Therefore,  with 4 significant figures where the student measures the length of two pieces of paper as 8.21 in and 8.0 in. the total length is 16.21.

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Answer:

Conduction

Explanation:

Conduction is when energy directly travels through a solid to get from one point to another.

A student was holding a metal rod to a candle flame. After a while, he noticed that his hand was getting hot due to conduction.

The definition of conduction is the movement of something together with warmness or energy through a medium or passage. An instance of conduction is using a metallic rod to roast marshmallows on an open hearth and feeling the warmth rise through the rod from the fire for your hand.

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Answer:

1. λ = 806nm

2. E = 2.6504 × 10^-28J

3. a) f = 1.167 × 10^15 Hz

b) E = 7.73 × 10^-19J

Explanation:

1) The wavelength denoted by λ can be calculated using the formula:

λ = v / f

Where;

v = speed of light (3×10^8m/s)

f = frequency of light (Hz)

λ = 3 × 10^8/3.72 x 1014

λ = 0.80645 × 10^(8-14)

λ = 0.80645 × 10^-6

λ = 8.06 × 10^-7m

λ = 806nm

2) The energy (J) of a photon is calculated thus;

E = hf

Where;

h = Planck's constant (6.626 × 10^-34J/s)

f = frequency (4.00x10^5/s)

E = 6.626 × 10^-34 × 4.00x10^5

E = 26.504 × 10^(-34+5)

E = 26.504 × 10^-29

E = 2.6504 × 10^-28J

3. λ = v / f

2.57x10^-7 = 3 × 10^8 ÷ f

f = 3 × 10^8/2.57x10^-7

f = 1.167 × 10^(8+7)

f = 1.167 × 10^15 Hz

b) E = hf

E = 6.626 × 10^-34 × 1.167 × 10^15

E = 7.7325 × 10^(-34+15)

E = 7.73 × 10^-19J

Answer:

Increasing the speed of the particles

Explanation:

The energy absorbed in the phase B is used to increase the speed of the particles.

We can see a positive slope which shows that the temperature is increasing considerably with increasing time.

At this phase the reaction rate is become faster as the temperature change has a considerable effect on reaction rates.

Temperature is directly proportional to the average kinetic energy of reacting particles.

Answer:

2H⁺ (aq) + 2OH⁻ (aq) → 2H₂O (l)

General Formulas and Concepts:

Explanation:

Step 1: RxN

HNO₃ (aq) + Ca(OH)₂ (aq) → Ca(NO₃)₂ (aq) + H₂O (l)

Step 2: Balance RxN

2HNO₃ (aq) + Ca(OH)₂ (aq) → Ca(NO₃)₂ (aq) + 2H₂O (l)

Step 3: Ionic Equations

Total Ionic Equation:

2H⁺ (aq) + 2NO₃⁻ (aq) + Ca²⁺ (aq) + 2OH⁻ (aq) → Ca²⁺ (aq) + 2NO₃⁻ (aq) + 2H₂O (l)

Cancel out spectator ions.

Net Ionic Equation:

2H⁺ (aq) + 2OH⁻ (aq) → 2H₂O (l)

Answer:

D. gravity

hope this helps

Answer:

Mass of sodium chloride decomposed = 24.54 g

Explanation:

Given data:

Mass of sodium chloride decomposed = ?

Mass of chlorine gas formed = 15 g

Solution:

Chemical equation:

2NaCl      →         2Na + Cl₂

Number of moles of Cl₂:

Number of moles = mass/molar mass

Number of moles = 15 g/ 71 g/mol

Number of moles = 0.21 mol

Now we will compare the moles of Cl₂ with NaCl from balance chemical equation.

                    Cl₂            :              NaCl

                      1              :                2

                      0.21         :            2×0.21 = 0.42 mol

Mass of Sodium chloride decompose:

Mass = number of moles × molar mass

Mass = 0.42 mol × 58.44 g/mol

Mass = 24.54 g

Answer:

see the pic for the answer

7.91 grams of methane gas occupy a volume of 11.2 liters at STP.

What is STP?

Standard temperature and pressure, abbreviated STP, refers to nominal conditions in the atmosphere at sea level.

First, we need to calculate the number of moles:

STP is 0 °C and 1 bar.

One mole of a gas at STP has a volume of 22.71 L .

Moles of CH₄ = 11.2 L × ([tex]\frac{1 mol}{22.71 L}[/tex])

Moles of CH₄ = 0.4932 mol

Now we will calculate the mass of CH₄

Moles = [tex]\frac{mass}{molar \;mass}\\[/tex]

Mass of CH₄ = 0.4932 × 16.03

Mass of CH₄ = 7.91 g

Hence, 7.91 grams of methane gas occupy a volume of 11.2 liters at STP.

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Answer:

2-5

Explanation:

I just did it.

The oxidation numbers of the atoms in this reaction are 0 for Mg(s) and H in H₂, -1 for Cl in HCl, +1 for H in HCl and +2 for Mg in MgCl₂

An oxidation number is a number assigned to atoms in molecules to show the general distribution of the electrons.

Oxidation state or number helps us describe the transfer of electrons.

The oxidation number/state is also used to determine the changes that occur in redox reactions.

Overall, the oxidation number of an atom in a molecule is the charge that the atom would have if all polar covalent and ionic bonds resulted in a complete transfer of electrons from the less electronegative atom to the more electronegative one.

Therefore, The oxidation numbers of the atoms in this reaction are 0 for Mg(s) and H in H₂, -1 for Cl in HCl, +1 for H in HCl and +2 for Mg in MgCl₂

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Answer:

(a) 133.33nm

(b) 600nm

(c) 7,600nm

Explanation:

The concentration of Y can be determined by using the formula:

[tex]Y = \dfrac{[L]}{k_d+[L]}[/tex]

where;

[L] = concentration of the binding ligand.

kd = 400 nm

Thus:

When Y = 0.25; we get :

[tex]0.25 = \dfrac{[L]}{400+[L]}[/tex]

0.25 (400 + [L]) = [L]

100 + 0.25[L] = [L]

100 = [L] - 0.25 [L]

100 = 0.75 [L]

[L] = 100/0.75

[L] = 133.33 nm

At, Y = 0.6

[tex]0.6 = \dfrac{[L]}{400+[L]}[/tex]

0.6 (400 + [L]) = [L]

240 + 0.6[L] = [L]

240 = [L] - 0.6 [L]

240 = 0.4 [L]

[L] = 240/0.4

[L] = 600 nm

At, Y = 0.95

[tex]0.95 = \dfrac{[L]}{400+[L]}[/tex]

0.95 (400 + [L]) = [L]

380 + 0.95[L] = [L]

380 = [L] - 0.95 [L]

380 = 0.05 [L]

[L] = 380/0.05

[L] = 7600 nm

Answer:

Option B

Explanation:

In order to find the answer to this question you need to move the decimal point as many times as the exponent, positive exponent to the right and negative exponent to the left. In this case we have all positive exponents meaning we move all of them to the right but they all equal the same thing. The most logical answer to this question is option B "10.07×10^4" because the equation is balanced.

Hope this helps.

Answer:

C. Only 2s and 2p may hybridize; these orbitals contain valence electrons used in bonding.

Explanation:

Carbon has four valence electrons (2s² 2p²), in several organic compounds it forms four bonds and as this element has two types of orbitals to join, 2s and 2p, it is expected that a compound like methane has two types of C-H bonds, but this is not the case, as all its orbital atoms are the same.

In a process called hybridization, s orbitals and p orbitals are combined in an atom. Depending on the amount of p orbitals that are combined, the hybrid orbitals can be sp (one orbital 2s and one 2p are combined), sp² (the 2s orbital combines with two 2p orbitals) and sp³(the orbital 2s combines with three 2p orbitals).

The carbon atom has the presence of 6 electrons. The valence bond theory hybridized the 2s and 2p orbital for the bonding, as they have valence bonds.

The valence bond theory has been the atomic hybridization of the atoms that results in the formation of the bonds.

The carbon atom has 4 valence electrons present in the bonding valence orbitals. The orbitals combine as sp, sp2, sp3 orbital in order to form the bond.

Thus, since there has been the presence of valence electrons in the s and p orbitals, the 2s and 2p are involved in the hybridization. Hence, option C is correct.

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Answer:

Each Y atom needs three electrons to complete its octet by forming three bonds to hydrogen. There is one unshared pair of electrons and three bonding pairs of electrons. The bonds in the product are covalent.

Explanation:

Recall that group 5A elements contain five electrons in their outermost shell. These five electrons consists of a lone pair and three electrons that can form three bonds with hydrogen to give YH3 where Y is the group 5A element.

The YH3 molecule contains one lone(unshared) pair of electrons as well as three bonding pairs of electrons. The compounds are covalent.

Answer: All I know is it's that opposite of B this may not help but I hope it does.

Explanation:

Answer:

C

Explanation:

ap3x

Answer:

Universe.

Explanation:

Biosphere is just a planet. Solar system contains planets and star. Galaxy holds multiple solar systems only. Universe hold everything, biospheres, solar systems, and galaxies. I hope this helps :D

Answer:

B.

Explanation:

A solar system is IN a galaxy. Its not A.

A Galaxy doesnt have other galaxies in it. Its not c

A biosphere is only referring to earth. its not D.

Therefore, it is B. A universe is everything in outer space including stars, planets, and galaxies.

Answer:

A. group

B. period

C. numbers of valence electrons

B. increases

Answer:

A

Explanation:

it has non polar molecule, because it has the equal sharing of electrons, so equal repulsion from all sides. atoms are equally represented.

Answer:

Trigonal planar, non-polar

Explanation:

Answer:

SO₄²⁻ (aq) + Pb²⁺ (aq) → PbSO₄ (s)

General Formulas and Concepts:

Explanation:

Step 1: RxN

Na₂SO₄ (aq) + Pb(NO₃)₂ (aq) → PbSO₄ (s) + NaNO₃ (aq)

Step 2: Balance RxN

Na₂SO₄ (aq) + Pb(NO₃)₂ (aq) → PbSO₄ (s) + 2NaNO₃ (aq)

Step 3: Ionic Equations

Total Ionic Equation:

2Na⁺ (aq) + SO₄²⁻ (aq) + Pb²⁺ (aq) + 2NO₃⁻ → PbSO₄ (s) + 2Na⁺ (aq) + 2NO₃⁻ (aq)

Cancel out spectator ions.

Net Ionic Equation:

SO₄²⁻ (aq) + Pb²⁺ (aq) → PbSO₄ (s)

a. P=0.971 atm=737.6 mmHg

b. n=2.88 x 10⁻³

Dalton's law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases

[tex]\tt P_T=P_1+P_2+..P_n[/tex]

A. vapor pressure of water at 22.5 = 20.4 mmHg

Pt=P H₂ + P H₂O

758 = P H₂ + 20.4

P H₂=737.6 mmHg=0.971 atm

B.Ideal gas Law = PV=nRT

P = 0.971 atm

V = 72 ml = 0.072 L

R = 0.082 L/atm mol

T = 22.5 + 273.15 =295.65

[tex]\tt n=\dfrac{0.971\times 0.072}{0.082\times 295.65}=2.88\times 10^{-3}[/tex]

answer: its 7290 joules.

explanations: the first procedure is to convert 1 pound to kilogram. 1 kg = 2.205 hence given 100 lb so we cross multiply. 1 kg * 100 = 2.205 * x

hence x= 45 kg. let's convert 1 mile per hour = 0.45 metre per second we cross multiply by 40 mile per hour. x= 40 * 0.45= 18 m/s.

KE= 1/2 * 45 * (18)^2

= 1/2 * 45 * 14580

= 7290joules

Answer:

Na2HPO4

Explanation:

The chemical formula for Copper I Monohydrogen Phosphate is CuHPO₄.

Let's break down the formula to understand it better:

1. "Cu" represents copper, which is an element with the atomic symbol Cu. Copper is a transition metal that is commonly used in electrical wiring and plumbing.

2. "H" represents hydrogen, which is an element with the atomic symbol H. Hydrogen is the lightest and most abundant element in the universe.

3. "PO₄" represents the phosphate ion, which is composed of one phosphorus atom (P) and four oxygen atoms (O). The phosphate ion is commonly found in biological systems and is an essential component of DNA, RNA, and ATP.

So, when  combined one copper atom (Cu), one hydrogen atom (H), and one phosphate ion (PO₄),  get the formula CuHPO4, which represents Copper I Monohydrogen Phosphate.

It's important to note that the "I" in Copper I refers to the charge of the copper ion in this compound. Copper can form different ions with different charges, and the Roman numeral indicates the charge of the copper ion in this particular compound.

Thus,  chemical formula for Copper I Monohydrogen Phosphate is CuHPO₄.

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Answer: synthesis

Explanation: hhhhh

Answer:

Synt

Explanation: