What is the molarity of a solution prepared by adding enough water to 2 g of acetone to make a total volume of 1.60 l?

Answer:

56.2

Explanation:

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What does botanist study?

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Answer:

A. Protons and electrons

Answer:

Explanation:

21. Atoms are not created or destroyed means that atoms that you begin with are the atoms that you will end with. The catch is that the atoms will rearrange to give you new compounds, but the atoms that you initially had are the atoms you will still have after reaction. For eg, if you started with eggs and made omelet. Omelet is a "new" compound, but the atoms that were in the eggs have rearranged to become the omelet so can you see that atoms were not created or destroyed to make the omelet.

22. Yes because amount of products you make depends on how much reactants you have. For eg, I need two graham cracker(GC), one marshmallow(M), and one chocolate (C) to make a s'more. If I get more of each item then I can make more s'mores and consequently having minimum amounts results in less s'mores that I make.

23. Not possible, due to law of conservation of matter and energy. Atoms cannot be created nor be destroyed, they are simply rearranged. For eg, Taking A + B cannot give you a new compound with a chemical formula D or XZ. A + B can however give you AB which is rearrangement of the starting atoms.

24. Chemical equation is balanced when atoms on reactant side and atoms of product side are in equal counts. I have attached a graphic below for more help.

Answer:

1. Greenhouse gas.

2. Carbon sequestration.

3. Greenhouse effect.

Explanation:

Greenhouse gases can be defined as gases that trap heat within the Earth's atmosphere. Thus, an increase in global temperature is largely caused due to an increase in the amount of greenhouse gases in Earth's atmosphere.

Some examples of greenhouse gases present in the atmosphere are methane, water vapor, carbon dioxide etc.

Matching the descriptions with their term respectively, we have;

1. Greenhouse gas: carbon dioxide, water vapor, methane, nitrogen oxides, and some CFCs that absorb heat and keep it in the earth's atmosphere

2. Carbon sequestration: it's a technology used to capture the carbon released from smokestacks and store it in some part of the environment to keep it out of the atmosphere. Thus, it's a process that is typically used for capturing and the long-term storage of atmospheric carbon dioxide in soil, ocean, plants and geologic formation, so as to reduce global warming or climate change.

3. Greenhouse effect: it's a term used to describe the negative role that greenhouse gases such as methane, water vapor, carbon dioxide etc., play in keeping the earth warm.

Answer:

mice

bacteria

fungi

Explanation:

that's the answer

Answer:

Formula of EPSOM salt = MgSO4.7H2O

molecular mass of MgSO4.7H2O = atomic mass of Mg + atomic mass of S + 4 × atomic mass of O + 7 { 2 × atomic mass of H + atomic mass of O }

= 24 + 32 + 4× 16 + 7{ 2 × 1 + 16 } g/mol

= (24 + 32 + 64+ 126 ) g/mol

= 246 g/mol

molecular mass of total water = 7 × ( 2× atomic mass of H + atomic mass of O )

= 7 × 18 = 126 g/mol

now ,

% mass of H2O in EPSOM salt = {total molar mass of H2O/molar mass of Epsom salts }× 100

= {126/246 } × 100

= 12600/246

= 51.21 %

Explanation:

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Explanation:

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The relative atomic mass (Ar) of this element is approximately 63.6 (to three significant figures).

To determine the relative atomic mass (Ar) of the element, we use the following formula:

Ar = (m₁ × % abundance1 + m₂ × % abundance2) / 100

Where:

m₁ and m₂ are the masses of the isotopes (peaks) in the mass spectrum,

% abundance1 and % abundance2 are the percentage abundances of the corresponding isotopes.

Given information:

Peak at m/z 63.0 with a percentage abundance of 69.1%.

Peak at m/z 65.0 having a percentage abundance of 30.9%.

Calculate the weighted average mass of the element's isotopes.

Ar = (63.0 × 69.1 + 65.0 × 30.9) / 100

Ar = (4347 + 2009.5) / 100

Ar = 6356.5 / 100

Ar ≈ 63.565

Noe, let's round the calculated mass to three significant figures.

Ar = 63.6

So, the relative atomic mass (Ar) of this element is approximately 63.6 (to three significant figures). This means that the average mass of the element's atoms is approximately 63.6 times the mass of one-twelfth of a carbon-12 atom, which is the standard reference for atomic masses.

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Answer:

ΔS⁰ = -181.1J/molK

Explanation:

ΔS⁰ of a reaction is defined as the sum of the entropies of the reactants times its reaction coefficient minus the sum of the entropies of the products times its reaction coefficient. For the reaction in the problem:

ΔS⁰ = 2*S{NaCl(s)} - (2*S{Na(s)}+S{Cl2(g)})

ΔS⁰ = 2*72.1J/molK - (2*51.1J/molK + 223.1J/molK)

Answer:

Mole of NaOH = 0.00308 mole

Explanation:

From the question given above, the following data were obtained:

Volume = 22 mL

Molarity = 0.140 M

Mole of NaOH =?

Next, we shall convert 22 mL to L. This can be obtained as follow:

1000 mL = 1 L

Therefore,

22 mL = 22 mL × 1 L / 1000 mL

22 mL = 0.022 L

Finally, we shall determine the number of mole of NaOH in the solution. This can be obtained as shown below:

Volume = 0.022 L

Molarity = 0.140 M

Mole of NaOH =?

Molarity = mole / Volume

0.140 = Mole of NaOH / 0.022

Cross multiply

Mole of NaOH = 0.140 × 0.022

Mole of NaOH = 0.00308 mole

Thus, 0.00308 mole of NaOH is present in the solution.

Answer:

19.4 g of alum, will be its theoretical yield

Explanation:

The reaction is:

2 Al + 2 KOH + 4 H₂SO₄ + 22H₂O → 3H₂ + 2KAl(SO₄)₂•12H₂O

Let's determine the amount of acid.

M are the moles contained in 1 L of solution or it can be mmoles that are contained in 1 mL of solution

M = mmol /mL

M . mL = mmol

We replace: 8.3 mL . 9.9 M = 82.17 mmoles

We convert to moles: 82.17 mmol . 1 mol / 1000mmol = 0.082 moles

Ratio is 4:2

4 moles of sulfuric acid can make 2 moles of alum

By the way, 0.082 moles of acid may produce ( 0.082 . 2) /4 = 0.041085 moles.

We convert moles to mass:

Molar mass of alum is: 473.52 g/mol.

0.041085 moles . 473.52 g/mol = 19.4 g

Answer:

10

Explanation:

how many electron-containing d orbitals are there in an atom of tin? name the element in the 4th period whose atoms have the same number of highest-energy-level elctrons as tin

10, germanium

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, the total number of orbitals containing electrons in an atom of tin are 10 orbitals.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

The electronic configuration of tin is 1s² 2s² 2p⁶ 3s²3p⁶ 4s² 3d¹⁰ 4p⁶ 5s²4d¹⁰ 5p² or [Kr] 5s² 4d¹⁰ 5p². The total number of orbitals containing electrons in an atom of tin are 10 orbitals. tin an element that belongs to p block of periodic table.

Therefore, the total number of orbitals containing electrons in an atom of tin are 10 orbitals.

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Molar Mass of Al = 27

Molar Mass of S = 32

Molar Mass of O = 16

Putting the molar mass value in Al2 (SO4) 3

27 x 2 + 3 ( 32 + 16 x 4)

54 + 3 ( 32+ 64)

54 + 3 x 96

54 + 288

342

Answer:

I think they have high, because the nonpolar molecules usually have a much lower surface tension than polar ones.

Explanation:

Neutralisation reactions are not always exothermic. ... When an acid is neutralised by an alkali the reaction is exothermic.SInce strong acids and strong bases are completely dissociated in solution, no formal bonds are being broken. The formation of two very strong covalent bonds between hydrogen and the hydroxide ion is responsible for the neutralization reaction's exothermic character.

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Answer:

Temperature depends on the average kinetic energy of the particles in a sample. ... The fastest particles have the greatest mass. Most particles in the plasma are heavy and slow. The fastest particles transfer most of their energy through collisions

Answer:

C. Most particles in the plasma are heavy, slow, and very low density.

Explanation:

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Good luck everyone, you got this! Have a great day!

Answer:

1.3 × 10²⁵ atoms

Explanation:

Step 1: Calculate the volume of an apple

The radius of an apple is 3.5 cm (3.5 × 10⁻² m). If we assume it is a sphere, we can calculate its volume using the following expression.

V = 4/3 × π × r³

V(apple) = 4/3 × π × (3.5 × 10⁻² m)³ = 1.8 × 10⁻⁴ m³

Step 2: Calculate the volume of 1 atom

The radius of 1 atom is 1.5 A (1.5 × 10⁻¹⁰ m). If we assume it is a sphere, we can calculate its volume using the following expression.

V = 4/3 × π × r³

V(atom) = 4/3 × π × (1.5 × 10⁻¹⁰ m)³ = 1.4 × 10⁻²⁹ m³

Step 3: Calculate how many atoms are in 1 apple.

V(apple)/V(atom) = 1.8 × 10⁻⁴ m³/1.4 × 10⁻²⁹ m³ = 1.3 × 10²⁵

Answer:

Risky behavior or risk-taking behavior is defined according to Trimpop (1994) as “any consciously, or non-consciously controlled behavior with a perceived uncertainty about its outcome, and/or about its possible benefits, or costs for the physical, economic or psycho-social well-being of oneself or others.” In addition to this broad definition, there are other definitions of risky behavior depending on the field of research. While in the economic view, risk is defined in terms of the variability of possible monetary outcomes, in the clinical literature, the risk is generally defined as exposure to possible loss or harm (Schonberg, Fox, & Poldrack, 2011). Turner et al. (2004) described risk-taking behavior further as either a socially unacceptable volitional behavior with a potentially negative outcome in which precautions are not taken, such as speeding, drinking and driving, drugs abuse, unprotected sex and so on.

Answer:

Unit is the standard assigned to measure physical quantity. ... Length, mass, time, temperature, luminous intensity, and the electric current are known as the fundamental quantities. These are represented by L, M, T, 0, Cd, and A respectively

OAmalOHopeO

Answer:

7276783

Explanation:

8765467

Answer:

B. 2.14 x 10^-19 J

Explanation:

The energy of a wave of light can be obtained using the equation:

E = h*c/λ

Where E is the energy in joules,

λ is wavelength = 930nm = 930x10⁻⁹m

h = Planck's constant = 6.626x10⁻³⁴Js

c = Speed of light = 3.00x10⁸m/s

Replacing:

E = 6.626x10⁻³⁴Js*3.00x10⁸m/s/930x10⁻⁹m

E = 2.14x10⁻¹⁹J

Right option is:

Answer:

D

Explanation:

Because of their complementary nature, the oxidation and reduction processes together are referred to as redox reactions. The reactant that brings about the oxidation is called the oxidizing agent, and that reagent is itself reduced by the reducing agent. Examples are, mercury(II) oxide, oxygen, and the copper(II) ion are oxidizing agents, and carbon, hydrazine, and zinc are the reducing agents.

Answer:D

Explanation:Because of their complementary nature, the oxidation and reduction processes together are referred to as redox reactions. The reactant that brings about the oxidation is called the oxidizing agent, and that reagent is itself reduced by the reducing agent. Examples are, mercury(II) oxide, oxygen, and the copper(II) ion are oxidizing agents, and carbon, hydrazine, and zinc are the reducing agents.

Answer:

the equation is balanced

Explanation:

the equation is balanced

Explanation:

the equation is blanced

Answer: The mass of chlorine gas required is 94.6 mg

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

The equation used is:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)

Given mass of gold = 0.175 g

Molar mass of gold = 197 g/mol

Plugging values in equation 1:

[tex]\text{Moles of gold}=\frac{0.175g}{197g/mol}=0.000888 mol[/tex]

The given chemical equation follows:

[tex]2Au+3Cl_2\rightarrow 2AuCl_3[/tex]

By the stoichiometry of the reaction:

If 2 moles of gold reacts with 3 moles of chlorine gas

So, 0.000888 moles of gold will react with = of chlorine gas

Molar mass of chlorine gas = 71 g/mol

Plugging values in equation 1:

[tex]\text{Mass of chlorine gas}=(0.001332mol\times 71g/mol)=0.0946g=94.6mg[/tex]       (Conversion factor: 1 g = 1000 mg)

Hence, the mass of chlorine gas required is 94.6 mg

Answer: Weather currents change wind tempature and there for change the weather of the seasons.

Explanation:

least= Li,F,N,He,Ca,O

medium=N,Br,K,Ne,Zn,Fr

most= F,I,K,Kr,Br,Ga

Answer:

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