PLZ HELP 40 POINTS PLEASEEEEEE

Answer:

The hypothesis becomes a theory if the results support it is answer.

Explanation:

I hope it's helpful!

Answer:

yes; and because of how roughly they are played.

Explanation:

Answer:

Molecular formulas describe the exact number and type of atoms in a single molecule of a compound. The constituent elements are represented by their chemical symbols, and the number of atoms of each element present in each molecule is shown as a subscript following that element's symbol.

Explanation:

hope this helped !

Answer:

all of the above

Explanation:

Answer:

To obtain one mole of copper atoms (6.02 x 1023 atoms), ... mol Ag? (b) How many atoms of Ag are in 0.0342 mol Ag? 7 ... contain one S atom and two O atoms; calculate its molar mass.

Answer:

1.09 × 10⁻⁷ m

UV region

Explanation:

Step 1: Given and required data

Energy of the photon of light (E): 1.83 × 10⁻¹⁸ J

Planck's constant (h): 6.63 × 10⁻³⁴ J.s

Speed of light (c): 3.00 × 10⁸ m/s

Step 2: Calculate the wavelength (λ) of this photon of light

We will use the Planck-Einstein's relation.

E = h × c/λ

λ = h × c/E

λ = 6.63 × 10⁻³⁴ J.s × (3.00 × 10⁸ m/s)/1.83 × 10⁻¹⁸ J = 1.09 × 10⁻⁷ m

This wavelenght falls in the UV region of the electromagnetic spectrum.

Answer:

Explanation:

Many tests to distinguish aldehydes and ketones involve the addition of an oxidant. Only aldehydes can be easily oxidized because there is a hydrogen atom next to the carbonyl and oxidation does not require oxygen

1. 1 mol=6.02.10²³ particles

[tex]\tt \dfrac{3.63\times 10^{23}}{6.02\times 10^{23}}=0.602~moles[/tex]

2. Molar mass = Total atomic mass of component

AlBr₃ = Ar Al + 3. Ar Br

AlBr₃ = 27 + 3. 80 = 267 g/mol

3. mass = mol x MW

MW MnCl₂  = 55 + 2.35.5=126 g/mol

mass = 31.6 x 126 =3981.6 g

4. at STP, 1 mol =22.4 L, so for 5.6 L :

[tex]\tt \dfrac{5.6}{22.4}=0.25~moles[/tex]

5. moles = mass : MW

MW CH₃OH = 12.1 + 4. 1 + 16.1 =32 g/mol

[tex]\tt moles=\dfrac{0.5}{32}=0.016[/tex]

6. 1 mol = 22.4 L at STP

1 mol = 6.02.10²³ particles

moles for  8.20 x 10¹⁴ molecules

[tex]\tt \dfrac{8.2\times 10^{14}}{6.02\times 10^{23}}=1.36\times 10^{-9}[/tex]

volume :

[tex]\tt 1.36\times 10^{-19}\times 22.4=3.05\times 10^{-8}~L[/tex]

Explanation:

Fundamentally the aluminum foil is a rectangular prism. It has a length, a width, and a thickness.

The volume of a rectangular prism is expressed as

[tex]V = l * w * h[/tex]

If we know the volume and two of the three dimensions, we can rearrange the equation to solve for the thickness.

[tex]h = V/(l*w)[/tex]

But we should also be sure to confirm our units.

A liter is defined as 1000 cm^3. Therefore a mL is equal to 1 cm^3.

You should convert the units of measure given in the problem statement such that the units are aligned. For example, 10.0mm will be 1 cm and 12.5m will be 1250 cm. This will give you a height in cm.

Answer:

J. the growth of trees

Explanation:

The growth of trees would be greatly impaired if the energy from the sun were stopped.

Plants generally use the energy from the sun to obtain their nourishment. This same process makes food available in the ecosystem.

Answer:

yes, the cells in the liguid is all congrating together.

Explanation:

Answer:

A

Explanation: Your answer is A true

Answer:

Explanation:

The nucleus of an atom is about 10-15 m in size; this means it is about 10-5 (or 1/100,000) of the size of the whole atom. ... (10-15 m is typical for the smaller nuclei; larger ones go up to about 10 times that.) Mass. Although it is very small, the nucleus is massive compared to the rest of the atom.

Answer:

The nucleus of an atom is about 10-15 m in size; this means it is about 10-5 (or 1/100,000) of the size of the whole atom. ... (10-15 m is typical for the smaller nuclei; larger ones go up to about 10 times that.) Mass. Although it is very small, the nucleus is massive compared to the rest of the atom.

Explanation:

Answer:

1 sulfur

Explanation:

1 mole is equal to 1 moles Sulfur, or 32.065 grams

Answer:

[tex]\boxed {\boxed {\sf 1.24727159 \ moles \ of \ sulfur }}[/tex]

Explanation:

To convert from grams to moles, we must use the molar mass found on the Periodic Table of Elements.

1. Molar Mass

This is a sample of sulfur, so look for S on the table.

2. Convert from Grams to Moles

Use the molar mass as a ratio.

[tex]\frac { 32.07 \ g \ S}{ 1 \ mol \ S }[/tex]

Multiply by the given number of grams: 40

[tex]40 \ g \ S * \frac { 32.07 \ g \ S}{ 1 \ mol \ S }[/tex]

Flip the fraction so the grams of sulfur will cancel each other out.

[tex]40 \ g \ S * \frac {1 \ mol \ S }{ 32.07 \ g \ S}=40* \frac {1 \ mol \ S }{ 32.07 }[/tex]

[tex]\frac {40 \ mol \ S } { 32.07 } = 1.24727159 \ mol \ S[/tex]

There are 1.24727159 moles of sulfur.

Explanation:

it is negative acceleration

Answer:

negative acceleration

Explanation:

Answer:D. Tin

Explanation:

Answer:

The correct option is a

Explanation:

First ionization energy is the minimum amount of energy required to remove the most loosely bound electron (valence electron) from the outermost shell of a gaseous or neutral atom. Since it takes more amount of energy to remove more electrons, it (ionization energy) generally increases across the period and decreases down a group because the closer the outermost shell is to the nucleus, the more difficult/energy required to remove electrons in that shell.

Since magnesium and phosphorus are on the same period (period 3), it can be deduced from the explanation above that phosphorus has a greater first ionization energy than magnesium because phosphorus (5 valence electrons) has more electrons in it's outermost shell than magnesium (2 valence electrons).

Answer:

Mass = 0.96 g

Explanation:

Given data:

Volume of oxygen = 840cm³

Temperature = at room = 25°C

Pressure = at room = 1 atm

Mass of oxygen = ?

Solution:

Volume of oxygen = 840 cm³ × 1 L /1000 cm³ = 0.84 L

Temperature  = 25 +273.15k = 298.15 K

Formula:

PV = nRT

n = PV/RT

R = 0.0821 atm.L/mol.K

n = 1 atm × 0.84 L / 0.0821 atm.L/mol.K ×  298.15 K

n = 0.84 atm.L / 24.48 atm.L/mol

n = 0.03 mol

Mass of oxygen:

Mass = number of moles × molar mass

Mass = 0.03 mol × 32 g/mol

Mass = 0.96 g

Answer:

[tex]m_{PbI_3}=383.05gPbI_3[/tex]

Explanation:

Hello!

In this case, since the reaction between lead and iodine is:

[tex]2Pb+3I_2\rightarrow 2PbI_3[/tex]

We can see there is 2:2 and 3:2 mole ratio between each reactant and the product; in such a way, for the limiting reactant we must compute the moles of lead (III) iodide yielded by each reactant first:

[tex]n_{PbI_3}^{by\ Pb}=135gPb*\frac{1molPb}{207.2gPb}*\frac{2molPbI_3}{2molPb} =0.652molPbI_3\\\\n_{PbI_3}^{by\ I_2}=338gI_2*\frac{1molI_2}{253.81gI_2}*\frac{2molPbI_3}{3molI_2} =0.888molPbI_3[/tex]

Thus, the limiting reactant is lead because it yields the fewest moles of product. Next, we compute the mass of lead (III) iodide by multiplying the produced 0.652 moles by its molar mass:

[tex]m_{PbI_3}=0.652molPbI_3*\frac{587.91gPbI_3}{1molPbI_3} \\\\m_{PbI_3}=383.05gPbI_3[/tex]

Best regards!

Answer:

you have a 3.17molal solution: This is 3.17mol CaCl2 dissolved in 1 litre of water. Make this solution.  

Molar mass CaCl2 = 110.9848 g/mol

3.17mol = 3.17*110.9848 = 351.822g  

Total mass = 1000g H2O + 351.822g CaCl2 = 1,351.822g  

Volume of this solution:

Volume = mass / density

Volume = 1,351.822/1.24  

Volume = 1,090.2 mL  

You have 3.17mol CaCl2 dissolved in 1,090.2 mL solution

Mol CaCl2 dissolved in 1000mL solution =  1000/1090.2*3.17 = 2.91 mol CaCl2  

Molarity of CaCl2 solution = 2.91M

Explanation:

Viewed simply, electrons are arranged in shells around an atom's nucleus. Electrons closest to the nucleus will have the lowest energy. Electrons further away from the nucleus will have higher energy. ... In a more realistic model, electrons move in atomic orbitals, or subshells.

By definition:

The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).  

There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level. Electrons with less energy will be spinning at level 1.

Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4. These 4 sub-levels are called: s, p, d, f.

In the sub-level s there can only be a maximum of 2 electrons, in sub-level p there can be a maximum of 6 electrons, in the sub-level d 10 electrons and finally in the sub-level f there can be a maximum of 14 electrons.

Aufbau's principle is a principle of atomic physics, which explains how electrons are accommodated in their orbits around the nucleus of the atom. This principle states that the filling of these orbitals occurs in increasing order of energy, that is, from the orbitals of lower energy to those of higher energy.

The simplest of the sub-levels is 1s. If you fill the 1s you can start filling the 2s. After the 2s sub-level is satisfied, the 2p can begin to fill and so on. The order is:  

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹⁴5d¹⁰6p⁶7s²5f¹⁴6d¹⁰7p⁶

In this way, taking into account the atomic number Z of the element (which represents the number of protons of the element, and in a neutral atom it also indicates the number of electrons), the electrons that it has in the orbitals will be placed following the previously established.

For example, for hydrogen, whose atomic number is Z = 1, its electronic configuration would be: 1s¹.

Remember that the number 1 that precedes the representative letter of the orbital indicates the level of energy where the electron is located, the letter s indicates the type of orbital where the electron is located, and the exponent 1 indicates the number of electrons that are located in said orbital.

In summary:

Learn more:

Answer:

i dont know

Explanation:

sorry

Answer:

Explanation:

Let the protein contained in pizza be m gram .

calories contained by 17 g of fat = 17 x 9  kcals = 153  kcals .

calories contained by 25 g of carbohydrate = 25 x 4  kcals = 100 kcals .

calories contained by m  g of protein  = m  x 4  kcals = 4 m  kcals .

Total calories of slice of pizza = 153 + 100 + 4m kcals

= 253 + 4m kcals

Given ,

253 + 4m = 750

4m = 497

m = 124.25 g .

120 g ( rounded to two significant  figures )

Answer:

u got a me off guard and thought sum else, lol but um a marble?

Explanation:

Answer:

1st order

Explanation:

because magnesium has a coefficient of 1, it is first order

hydrochloric acid has a coefficient of 2, so it is second order

overall the reaction is third order (1+2)

Ivermectin is present at doses of 10 mg per mL, which is adequate to treat 110 lb (50 kg) of body weight (maximum 10 mL per injection site.).

Antiparasitic medication ivermectin is used. It was first used in veterinary medicine to prevent and treat heartworm and acariasis after being discovered in 1975.

A steroid is not ivermectin. Drugs called steroids behave similarly to cortisol and work to reduce edoema in the body. Prednisolone, betamethasone, and other typical steroids are listed below. Ivermectin, on the other hand, is an anthelmintic medication.

Barbiturates (such as phenobarbital and butalbital), benzodiazepines (such as clonazepam and lorazepam), sodium oxybate (GHB), and valproic acid are a few of the medications that may interact with this medication.

Thus, Ivermectin is present at doses of 10 mg per mL, which is adequate to treat 110 lb (50 kg) of body weight (maximum 10 mL per injection site.)

To learn more about Ivermectin, follow the link;

https://brainly.com/question/28524204

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The electrical energy required : 0.082 F

Given

1.000L of H₂ at 25°C and 1.00 atm

Required

Electrical energy

Solution

Redox reactions in water electrolysis :

Anode: 2H2O (l) → O2 (g) + 4H⁺ (aq) + 4e

Cathode: 4H2O (l) + 4e → 2H2 (g) + 4OH⁻ (aq)

Reaction: 2H2O → 2H2 (g) + O2 (g)

mol H₂ :

n = PV/RT

n = (1 atm x 1 L)/(0.082 x 298)

n = 0.041

From reaction at cathode : mol ratio of electron and H₂ = 4 : 2, so mol electrons :

= 4/2 x mol H₂

= 2 x 0.041

= 0.082

1 Faraday is the amount of electricity that is passed in the electrolysis cell to obtain 1 mole of electrons.

1 Faraday = 1 mole of electrons = 96500 Coulombs

So the energy required :

0.082 Faraday