c) Why are colored solutions of metal ions common among transition elements but not main-group elements?

The value of ''n" in the hydrate formula is 10

Mass of anhydrous NA2B4O7 = 2.64g

Molar mass of NA2B4O7 = 201.224 g/mol

Number of Moles of anhydrous NA2B4O7 = Mass of NA2B4O7 / Molar mass of NA2B4O7

                                                     = 2.64 / 201.224

                                                     = 0.0131 mol

Mass of water in 5.00g of NA2B4O7 = 5.00 - 2.64

                                                              = 2.36 g

Moles of water = 2.36 / 18.015

                          = 0.1307 mol

The whole number ratio = moles of water / moles of anhydrous sodium tetra borate

                                           = 0.1307 / 0.0131

The whole number ratio = 10

Hence the value of n in the hydrate formula is 10.

NA2B4O7. 10H2O

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Answer:

1.Improves electric reliability.

2.Enhance recovery.

3.Promotes clean energy.

Explanation:

Some people suffering from the darkness still had their lights from facilities with microgrids.Power outages they can be dangerous.Microgrids keep the power flowing by disconnecting.It also generate possibly batteries then the microgrids customers are served until power is restored on the Central grid.

Answer:

it depends on the level of moisture of the bread wet bread molds more quickly than dry bread because mold thrives in damp environments if you didn't experiment and tested one slice of dry bread and one damp slice of the same bread the dampened slice would grow mold much more quickly than the dry one

I hope this helps have a good dày or night :)

Answer:

4.34 times 10^24

Explanation:

number of atoms=7.2 times Avogadro's number

                           =7.2 times 6.02 times 10^23

                           =4.34 times 10^24

Answer:

Explanation: we will multiple the amount of moles to the Avogadro's number for example:                                                                                                        

                                     7.2*6*10 to the power 23

Answer:

6.022x10^23 molecules

Explanation:

Since it's one mole of CaCO3, multiply by Avogadro's number to get molecules

Answer:

b

Explanation:

Water is able to dissolve many compounds as a result of the fact that water molecules are polar and that the hydrogen atoms in water molecules have a slight negative charge.

When a liquid spreads over the surface flippantly with out the formation of droplets, a floor is wetted. If that liquid is water, the surface is hydrophilic. Water molecules have a polar association of oxygen and hydrogen atoms—one side (hydrogen) has a wonderful electric charge and the alternative side (oxygen) had a terrible rate. This lets in the water molecule to turn out to be drawn to many different unique varieties of molecules. Generally speaking, water is right at dissolving ions and polar molecules, however terrible at dissolving nonpolar molecules.

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Answer:

Temperatures in the mesosphere decrease with altitude. There are few gas molecules in the mesosphere to absorb the Sun's radiation, the heat source is the stratosphere below. The mesosphere is extremely cold.

Explanation:

Explanation:

քʀa ʋċ ʀɛsքօռɖɛʀ ɛ sօ ʟɛʀ ɛ ɛռtɛռɖɛʀ օ զʊɛ ʋċ զʊɛʀ ʋɛʀ ռa քɛʀɢʊռta aɨ ʋċ քɛsզʊɨsaʀ օ զʊɛ ʋօċɛ զʊɛʀ ʋɛʀ ɛ ʀɛsքօռɖɛ օxɛ

(i) The vehicle outputs approximately 11.58 kg of CO₂ per week. (ii) The Biofuel Obligation Scheme in Ireland is implemented by requiring fuel suppliers.

To calculate the amount of CO₂ output per week, we need to determine the amount of fuel used and then use the given combustion equation to find the ratio of CO₂ produced per unit of fuel.

Given;

Average fuel efficiency: 7.5 km per litre

Distance traveled per week: 300 km

Mass of fuel per litre: 0.75 kg

First, we calculate the total fuel used per week;

Fuel used = Distance traveled / Fuel efficiency

= 300 km / 7.5 km per litre

= 40 litres

Next, we find the mass of fuel used per week:

Mass of fuel used = Fuel used × Mass of fuel per litre

= 40 litres × 0.75 kg per litre

= 30 kg

Using the combustion equation, we know that 2 moles of C₈H₁₈ produce 16 moles of CO₂. Therefore, we can calculate the moles of CO₂ produced from the given mass of fuel;

Moles of CO₂ produced = Moles of C8H18 × (16 moles of CO₂ / 2 moles of C₈H₁₈)

= (30 kg / (114 g/mole)) × (16 moles of CO₂ / 2 moles of C₈H₁₈)

= (30,000 g / 114 g/mole) × (16 moles of CO₂ / 2 moles of C₈H₁₈)

= 263.16 moles of CO₂

Finally, we convert the moles of CO₂ to kilograms;

Mass of CO₂ produced = Moles of CO₂ produced × Molar mass of CO₂

= 263.16 moles × (44 g/mole)

= 11,579.04 g

= 11.58 kg (rounded to two decimal places)

Therefore, the vehicle outputs approximately 11.58 kg of CO₂ per week.

The Biofuel Obligation Scheme in Ireland is implemented by requiring fuel suppliers to include a certain percentage of biofuels in their overall fuel sales, thereby reducing the carbon footprint by promoting the use of renewable and lower-carbon-emitting fuels.

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Answer:

2.764 °C

Explanation:

ΔT = 2 x 1.86 C/m x 0.743m = 2.764C That means the freezing point of the solution is 2.764C less than the pure solvent (water)

Answer:

Plants can split starch into it's simpler glucose units for use as energy when needed. Cellulose is known as a structural carbohydrate because of the fibers formed by it's molecules. It is the major component of plant cell walls and comprises over half of the carbon found on planets.

Explanation:

I majored in Chemistry

When a nonmetal bonds with a nonmetal, electrons are shared between the two atoms, which creates a covalent bond. This type of bond involves the sharing of electrons between atoms to create a stable molecule. Therefore, the correct answer to the question is that a covalent bond is involved and a molecular compound forms.

Covalent bond is formed by sharing of electrons between two non metals to complete their octet. The covalent bond is formed between two non metals which have similar electronegativity.

While ionic bond is formed by gain or lose of electrons between metal and non metal and complete their octet.It is formed between two ions in which one is positive due to lose of electrons and other non metal is negative ion  due to gain of electron.

Ionic bond is formed by lose or gain of electrons therefore, it is stronger than covalent bond.

Example of ionic bond is NaCl

Example of covalent bond is

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Answer:

The higher your price, the less volume you have to produce for a given dollar amount of profit! Even a small price increase can generate significant additional profit. ... When a business comes out with a new product or service and they are the first to market, they may be able to charge high prices initially.

Explanation:

Answer:

electrons

Explanation:

The group number tells you the number of electrons in the element's outer shell (or valence shell).

Extra info: Elements with the same number of electrons on their outer shell are grouped together in the periodic table because they have similar properties.

Hope this helps!

Answer:

search the Lewis dot structure you will know the answer.

Answer:

I believe it would be 2

Explanation:

if there are 2 nitrogen molecules then there would have to be 2 hydrogen molecules but this could be completely wrong

if this happens to be right, ur welcome :3 here's a Jay Jay pic for u cuz why not

Answer:

Anwer is A  0.60

Explanation:

The pressure exerted by the water vapor molecules in the air is called the vapor pressure.

The Vapor pressure is the measure of the tendency of the material to change in to the gaseous state or the vapor state, and it will increases with the temperature. The temperature at which the vapor pressure of the surface of the liquid will becomes equal to the pressure that is exerted by the surroundings is called as the boiling point of the liquid.

The pressure exerted by the vapor in the thermodynamic equilibrium with the its condensed phases at the given temperature in the  closed system is termed as the vapor pressure.

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Answer:

\(tin \: sulphar gold \: are \: not \: mixture \: \\ they \: are \: elements \: \: others \: are \: mixture \\ thank \: you\)

Tin, sulfur, and gold are not a mixture because they are pure elements.

Pure substances can be described as elements that cannot be broken down into simple substances because they have only one type of atom in the whole composition.

A pure substance can be described as composed of two or more elements that are chemically combined and have a set composition such kind of pure substance is known as a compound.

A mixture can be described as made up of two or more different substances which are just physically combined but not chemically. A mixture can be separated into its initial components.

The composition of a heterogeneous mixture is non-uniform throughout the mixture while the composition of a homogeneous mixture is always the same in the entire mixture.

Therefore, tin, sulfur, and gold are pure elements, not a mixture.

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Answer:

what is the question

Explanation:

what do you need help with

The traits that the offspring got were taken from the parents.

Offspring get traits from their parents through the process of inheritance. Traits are determined by genes, which are segments of DNA that contain the instructions for building and maintaining an organism's body and traits.

Each parent contributes half of their genes to their offspring through their gametes, which are reproductive cells such as sperm and eggs. When a sperm fertilizes an egg, the resulting zygote has a complete set of genes from both parents.

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Answer: 28.0 L

Explanation:

At standard temperature and pressure, 1 mole of any gas is always 22.4 L. So, all you have to do for this problem is multiply 22.4 L by the amount of moles, 1.25.

\(22.4*1.25=28.0 L\)

Physical change does not alters the molecule or atoms that are present.

Physical changes are those changes that do not alter the identity of the molecules or atoms that are taking part in the chemical reaction. Or we can say that physical changes are changes in which no bonds are broken or formed. This means that the same types of compounds or elements that were present  at the beginning of the change are there at the end of the change as well. Because the ending materials are the same as the beginning materials, the properties (such as color, boiling point, etc.) will also be the same. Physical changes also  involve moving molecules around, but not changing them.

Whereas Chemical changes occur when bonds are broken and are formed between molecules or atoms. This means that one substance with a certain set of properties (such as melting point, color, taste, etc) is turned into a different substance which have different properties. Chemical changes are frequently harder to reverse than physical changes.

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The two ions present in the solution are:

1. Sodium ion, Na⁺

2. Hydroxide ion, OH¯

The correct answer to the question is the 3rd option. The sodium ion is positive, and the hydroxide ion is negative.

Ions are atoms or group of atoms which possess an electric charge.

Aqueous Sodium hydroxide, NaOH contains sodium ion and hydroxide ion.

The sodium ion is positive while the hydroxide ion is negative as illustrated below:

NaOH(aq) —> Na⁺(aq) + OH¯(aq)

From the illustration above, we can conclude that the correct answer to the question is the 3rd option. The sodium ion is positive, and the hydroxide ion is negative.

Please see attached photo for further details

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Answer:

B. The atoms are arranged in a rigid structure.

Explanation:

Because the entropy of solids depends on the structure of the atoms, a rigid structure has less randomness = less entropy. So, the answer is B.

Answer:

b

Explanation:

a p e x :)

Answer:

Has 5 protons and the atomic number is 5.

Explanation:

The atomic number is equal to the number of protons and every element has a different number of protons. Therefore, finding how many protons there are and comparing to atomic numbers (or vice versa) would allow you to find if the atom is boron.

The final temperature : 345 K

Given

475 cm³ initial volume

600 cm³ final volume

Required

The final temperature

Solution

At standard temperature and pressure , T = 273 K and 1 atm

Charles's Law  :

When the gas pressure is kept constant, the gas volume is proportional to the temperature  

V₁/T₁=V₂/T₂

Input the value :

T₂=(V₂T₁)/V₁

T₂=(600 x 273)/475

T₂=345 K