Fill in all the grey boxes including the green box. PLEASE HELP

Answer:

its the fourth one please mark as brainlest

Explanation:

"A solution of 5 M HCl is already made. You need to dilute the solution to 1 M HCl. The 1 M HCl solution is less concentrated." Thus, option b is correct.

Molar concentration has been the molarity of the solution that measures the amount of the solute present in the liter solution. It describes the solute concentration that depends on the volume.

The dilution of the solution by increasing the volume results in a decrease in the concentration as molarity and volume show an inverse relationship. So, 1 M is less concentrated than 5 M solution.

Therefore, option b. less concentrated is the correct blank.

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Your question is incomplete, but most probably your full question was, A solution of 5 M HCl is already made. You need to dilute the solution to 1 M HCl. The 1 M HCl solution is ____________.

a. more concentrated

b. less concentrated

c. neither

d. both less and more concentrated

If an ice cube is melting, its shape and state of matter changes from solid to liquid, while its chemical composition remains the same. Hence, it is a physical change.

When an ice cube melts, only the physical property of the ice cube changes. No new substances are formed, and the chemical composition of the ice does not change, making it a physical change.

A physical change occurs only the physical properties of the substance like colour, shape, density and solubility changes. It is easily reversible. The melted ice can easily be re-frozen back to its solid state. Also, the melting process does not produce any new chemical substance.

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Answer:

85.384 atm or 64608.13086 mmHg

Explanation:

PV= NRT

P= NRT/V

n= mols

R= gas constant (i used .0821 for atm)

T= Temp in Kelvins (Celsius degrees + 273)

V= in L

(65molsx480kx.0821)/30L

Answer:

the hydrogen end

Explanation:

In H - F molecules there is a charge separation. Hydrogen has partial positive charge on them and Fluorine has a partial negative charge on it.

Answer:

is a

Explanation: A, because the oceanic plate and continental plate are pushed up together

Location A, because the lighter oceanic plate will be pushed under the continental plate

Answer:

is a

Explanation:



Answer:

location A

Explanation:

Plates Subduct When an ocean plate collides with another ocean plate or with a plate carrying continents, one plate will bend and slide under the other. This process is called subduction. A deep ocean trench forms at this subduction boundary.

plus location B doesn't seem to have 2 plates colliding to cause subduction in the first place.

your welcome

Answer:

Mass = 17.8 g

Explanation:

Given data:

Number of atoms of Ca = 2.68 × 10²³

Mass in gram = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

2.68 × 10²³ atoms × 1 mole  /6.022 × 10²³ atoms

0.445 mol

Mass in gram;

Mass = number of moles ×  molar mass

Mass = 0.445 mol  ×  40 g/mol

Mass = 17.8 g

Answer:

2.78 moles of water are produced.

Explanation:

Given data:

Number of moles of H₂O produced = ?

Number of moles of oxygen react = 3.25 mol

Solution:

Chemical equation:

2C₂H₆ + 7O₂       →     4CO₂ + 6H₂O

Now we will compare the moles of water with oxygen.

                O₂          :          H₂O

                 7            :           6

               3.25        :           6/7×3.25 = 2.78 mol

Answer:

λ  =0.93×10⁻⁶ m

Explanation:

Given data:

Wavelength of wave = ?

Frequency = 3.23 ×10¹⁴ s⁻¹

Solution:

Formula:

Speed of wave = frequency × wavelength

speed of wave = 3×10⁸ m/s

by putting values,

3×10⁸ m/s = 3.23 ×10¹⁴ s⁻¹ × λ

λ  = 3×10⁸ m/s  /  3.23 ×10¹⁴ s⁻¹

λ  =0.93×10⁻⁶ m

Answer:

A 1.69%

i hope its right i worked it out

Answer:

b

Explanation:

i took the test edg2021

Answer:

b.

it is a warm air mass over a continent

Explanation:

Answer:

b

Explanation:

Earth's atmosphere is composed of multiple layers of gases surrounding earth. So the correct option is B.

The atmosphere of Earth extends from the planet's surface up to 10,000 kilometres (6,214 miles) above. Following that, the atmosphere disappears into space. Although there is disagreement among scientists on the location of the atmosphere's upper border, most of them can agree that the atmosphere's majority is found near the planet's surface, up to a distance of around eight to fifteen kilometres (five to nine miles).

While most life on Earth requires oxygen, oxygen does not make up the bulk of the planet's atmosphere. About 78% of the gases in the Earth's atmosphere are nitrogen, 21% are oxygen, 0.9 % are argon, and 0.1 % are other gases. The remaining 0.1 per cent of gases includes trace quantities of neon, water vapour, methane, carbon dioxide, and methane.

Based on temperature, the atmosphere is separated into five distinct strata. The troposphere, which is located between five and ten miles (or seven and 15 kilometres) above Earth's surface, is the layer that is closest to the surface. The troposphere is significantly thinner near the North and South Poles than it is at the equator. The troposphere, which makes up between 75 and 80 per cent of the total atmosphere, is where the majority of its mass is located.

Therefore the correct option is B.

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Answer:

63.5 copper

Explanation:

You have the balanced equation: CuO + H2 --> Cu + H2O. You can use stoichiometry and see there is a 1:1 molar ratio between CuO and Cu.

1) work out the moles of CuO.

- mol=mass/mol mass = 79.5g/(63.5+16.0) = 1 mol CuO

2) work out mol Cu

- from the 1:1 mol ratio you know if you have 1 mol CuO you must have 1 mol Cu. So mol Cu=1 mol

3) work out mass of Cu

- mol=mass/mol mass therefore mass= mol x molar mass = 1 x 63.5g/mol-1 = 63.5g Cu

Answer:

The phenotypic percentage of having yellow or green seeds is 50% for having either of the two colours

Explanation:

The crossing to determine the offsprings is shown in the image attached where we have two green (Yy) seeds and two yellow (yy) seeds as offsprings.

Thus, the phenotypic percentage of having yellow or green seeds is 50% for having either of the two colours.

Note, the dominant allele is "Y" while the recessive allele is "y". Thus, Yy would produce a yellow colour while yy would produce a green colour (as both mentioned in the question).

Also note that phenotype describes the outward properties/characteristics of an individual.

The components have very precise measurements to ensure that the cleaning agent has the right properties which means it is an example of a homogeneous mixture.

A mixture is referred to as a substance which comprises of two or more different chemical substances which are not chemically bonded and are of two types which are:

The homogeneous mixture is a type of mixture in which there is the same or uniform proportions of its components in the sample while heterogeneous mixture doesn't have a uniform proportion.

In this scenario, we were told that the components have very precise measurements with the right properties which depicts a homogeneous mixture and is the correct choice.

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Answer:

Low mass star phases

Explanation:

Helium fuses into carbon, the core of the star collapses. Once this happens, the outer layers become exhausted from the weight and this leads a planetary nebula to be formed from the outer layers. The core of the star remains a white dwarf for some time, but eventually it cools down and evolves to a black dwarf.

Density is defined as the mass divided by volume.

Density is also known by the name of viscosity.

Density is denoted by D.

It's unit is basically denoted by kg/m^3.

The density of the block is 0.42 g/cm^3.

The formula of the density is, Density = mass (m) / volume (v)

Now, it is given in the word problem that,

Mass of pine wood = 27g

Volume = 4^3 = 64 cm^3

Thus, Density = 27 g /64 cm^3 = 0.42 g/cm^3.

Hence, the density of the block of pine would be 0.42 g/cm^3

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Answer:

Electrolysis of water

Explanation:

The electrolysis of water is a decomposition reaction in which electricity is used to break down a compound into simpler molecules.

Decomposition of water is carried out in the Hofman Voltameter.

This process is achieved by passing current through an acidified water.

The expression is given as:

               2H₂O →  2H₂   +  O₂

Answer: 40 days

Explanation: The substance completely disintegrates in 20 days the substance completely disintegrates in 40 days 1/8 part of the mass of the substance will be left intact at the end of 40 days.

Answer:

28.1

Explanation:

plez give me brainliest

Answer:

9.85

Explanation:

M1V1 =M2V2

6.20×v1= 0.470×0.130

v1 = ( 0.470 × 0.130 ) ÷ 6.20

v1 = 0.0098 L × 1000

V1 = 9.8 ml

The mass of FeS formed : 11.97 g

Reaction

Fe(s) + S(s) → FeS(s)

mass Fe=7.62 g

mol Fe(MW=56 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{7.62}{56}\\\\mol=0.136[/tex]

mass S=8.67 g

mol S(MW=32 g/mol) :

[tex]\tt mol=\dfrac{8.67}{32}=0.271[/tex]

Limiting reactant : smaller ratio(mol:coefficient) ⇒coefficient=1

Fe : S =0.136 : 0.271⇒Fe limiting(smaller), S excess

Mol FeS based on Fe , so mol FeS=0.136

Mass FeS(MW=88 g/mol) :

[tex]\tt mass=mol\times MW\\\\mass=0.136\times 88=11.97~g[/tex]

Answer:

option d

Explanation:

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Answer: S₅Br₆

Explanation: The prefix “penta-“ means five, and the prefix “hexa-“ means six.

Halogen-fluorine,chlorine,bromine,iodine

Group II A- Beryllium,magnesium,calcium,strontium ,barium ,radium

Non-reactive- Helium,neon,argon,krypton,xenon,radon

Alkali metal-lithium ,sodium,potassium,rubidium,caesium,francium.

It is a representation of chemical elements in a tabular format.It is a graphical representation of modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

The periodic table is divided into 4 blocks, rows of the table are called periods and columns are known as groups. Elements belonging to the same group show same properties.

First periodic table  developed and accepted was by Russian chemist Dmitri Mendeleev in 1869.He formulated the periodic law as properties of the elements are a periodic function of their atomic masses.

Till date 118 elements have been discovered and all have been successfully placed in the periodic table based on their properties.

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Answer:

Use the periodic table to choose the element that matches each description.halogen: 

✔ iodine✔ magnesium

✔ argon ✔ potassium

N-methyl-2-pyrrolidone is a very reactive compound. It reacts in an acidic medium to form a variety of products. Some reactions involve the ring-opening step.

The structure of N-methyl-2-pyrrolidone is given below:

The compound has a five-membered ring, which consists of four carbon atoms and one nitrogen atom. The ring has one oxygen attached to it via the double bond, and one methyl group is attached to the nitrogen atom.

The chemical reaction involved is as follows:

The structure of the product is given below:

N-methyl-2-pyrrolidone on reaction with strong aqueous acidic medium followed by the treatment of heat results in the opening of the ring and forms a compound having a carboxylic group at one end and protonated nitrogen atom which has one methyl group attached to it, at another end

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Answer:

1s2 2s2 2p6 3s2 3p6 3d2 4s2

Explanation:

Answer: pic

Explanation:

plz

Answer:

4. matter is neither created nor destroyed

Explanation:

The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.