Write a scientific explanation that describes if we should use synthetic materials or only natural materials.
please help by the end of the night

Answer:

A. The air particles pushing on the tire as they expand

Explanation:

Answer: A is the right answer

Explanation:

The air pressure inside a bicycle tire is caused by the weight of the air molecules pressing down on the surface of the tire. This is why you can sometimes hear a hissing sound when you first get a flat tire – it’s because the air is escaping from the tire and equalizing the pressure inside and outside of the tire.

Answer:

"Initiate"

1. To put into effect; bring into use.
• begin

• commence

• create

• launch

2. To take in as a member.

• admit

• pledge

• recruit

• welcome

The mass percentage of C is 7.8 %

The method for expressing a concentration is known as mass percent. The solution components of a given solution can be defined by the mass percentage.

The molar mass of CCL4 is carbon 12.0107g + 4*chlorine 35.453g = 153.823g.

The number of moles of carbon in CCL4 can be found by dividing the mass of carbon (12.0107g) by the molar mass of carbon (12.0107g/mol).

The mass percentage of carbon in CCL4 can be found by multiplying the number of moles of carbon by the molar mass of CCL4 and dividing by the total mass of CCL4, then multiplying by 100.

So, mass percentage of C = (12.0107g / 153.823g) * 100 = 7.8 %

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Answer: False

Explanation:

There are no scientific proofs that an increase in co2 levels leads to an increase in the length of days, but there may be an explanation for how the appearance of the day matters to an individual as an increase in co2 concentration leads to an increase in the temperature of the earth (greenhouse effect) also its increases the temperature at the sunset and hence leads to a misunderstanding that the effect of sn is still there hence increasing the length of the day but this is clearly wrong and is reported by very few individuals, there is no direct relation of increase in co2 content and increase in day's length

Answer: 64.7 [tex]*10^2[/tex]

Explanation:

Significant figures are the number of digits in a value that correlate with the accuracy of that value.

First lets solve the equation:

(1.7x10^6)/(2.63x10^2) + 7.33 = ?

(1,700,000)/(263) + 7.33

(6,463.8783) + 7.33 = 6,471.2083

We have to simplify the answer to the correct amount of significant digits.

6,471.2083 -> 64.7 [tex]*10^2[/tex]

The beaker of orthoxylene was put inside a sealed tank containing orthoxylene gas at 142. degree C and 893. torr will have the same amount of liquid inside it after ten minutes because the system is a closed system as none of the liquid's vapor escapes.

The correct option is the same amount.

A closed system allows energy to enter and exit but not matter to enter or exit. About a closed system is a covered pot on the burner. Both matter and energy cannot enter or leave an isolated system. A thermos or cooler is about as isolated a system as there is.

The beaker of orthoxylene that was put inside a sealed tank containing orthoxylene gas at 142 degrees C and 893 torr is a closed system.

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Answer:

2, 5 -dimethylheptane

Explanation:

Drawing the full structure would help you understand better

Answer:

11000

Explanation:

85.3 has 3 significant figures

21.489 has 5 significant figures

0.0059 has 2 significant figures ( as zeros on the left are not significant)

The answer is always rounded off to the least number of decimal places given in the question. Here the least number is two significant figures.

Therefore;

(85.3 - 21.489)/0.0059

= (63.811)/0.0059

= 10815.42

As we have to round off the answer to two significant figures:

= 11000

The molecular formula of the compound is C₂Cl₂.

The empirical formula of a chemical compound is the smallest ratio of elements present in the compound. From the analysis

Calculate the number of moles of the compound using the ideal gas equation P × V = n × R × T

P × V = n × R × T

1.10 × 0.01 = n × 0.0821 × 291.0

0.011 = n × 23.8911

n = 0.011 ÷ 23.8911

n = 4.6 × 10⁻⁴ mol

Calculate the molecular mass using Stoichiometry n = m ÷ M

M = m ÷ n

M = 0.04373 ÷ (4.6 × 10⁻⁴)

M = 95.0 g/mol

The molecular mass for the compound equals the molecular mass from the empirical formula times n.

M = M ((CCl)ₙ)

95.0 = (12 + 35.5) × n

95.0 = 47.5 × n

n = 95.0 ÷ 47.5

n = 2.1

n ≈ 2

The molecular formula times 2 from the empirical formula C₂Cl₂

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If 8.2 moles of Mg are burned, the number of moles of O₂ consumed is 4.1 moles.

Stoichiometry refers to the quantitative relationship between the reactants and products of a specific reaction or equation.

According to this question, magnesium reacts with oxygen to produce magnesium oxide as follows:

2Mg + O₂ → 2MgO

Based on the above equation, 2 moles of magnesium reacts with 1 mole of oxygen gas

This means that 8.2 moles of magnesium will react with 8.2 × ½ = 4.1 moles of oxygen gas.

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The Cr-incorporated Ni catalyst shows optimized OH-binding as well as H-binding energies for facilitating water dissociation and improving HER activity in alkaline media.

Developing efficient and inexpensive electro catalysts for the hydrogen evolution reaction (HER) in alkaline water electrolysis plays a key role in renewable hydrogen energy technology.

The trends in HER activity with respect to the binding energies of Ni-based thin film catalysts by incorporating a series of oxophilic transition metal atoms. It was found that the doping of oxophilic atoms enables the modulation of binding abilities of hydrogen and hydroxyl ions on the Ni surfaces, leading to the first establishment of a volcano relation between OH-binding energies and alkaline HER activities.

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The pressure on a cold winter day would be 16.03 psi.

The pressure law state that the pressure of a gas at constant volume is directly proportional to its temperature. This law can be mathematically expressed as follows:

[tex]P_1/T_1 = P_2/T_2[/tex]

Where [tex]P_1[/tex] = initial pressure of the gas, [tex]T_1[/tex] = initial temperature, [tex]P_2[/tex] = final pressure, and [tex]T_2[/tex] = final temperature.

In this case, [tex]P_1[/tex] = 33 psi, [tex]T_1[/tex] = 35 [tex]^oC[/tex] and [tex]T_2[/tex] = -17 [tex]^oC[/tex]. What we are looking for is [tex]P_2[/tex].

[tex]P_2[/tex] = [tex]P_1.T_2/T_1[/tex]

    = 33 x -17/35

     = 16.03 psi

In other words, at constant volume and without leakage, the pressure in the tire on a cold winter day when the temperature is -17 [tex]^oC[/tex] would be 16.03 psi.

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Answer:

_4

Explanation:

according to how the ph scale is arranged ,you will notice that when tou move from ph 10 to ph 6 the form changes to negative and it will give the answer as _4

Order from the weakest attraction to the strongest attraction is SrCl₂ > RbCl > YCl₃.

The London dispersion forces are the least powerful intermolecular forces. London's dispersion forces are also referred to as induced-dipole-induced-dipole because they are transiently attractive forces that cause temporary dipoles to form.

The non-polar, monatomic gas exhibits London dispersion.Ionic bonds > Hydrogen bonding > Van der Waals dipole-dipole interactions > Van der Waals dispersion forces.

The attraction of hydrogen bond is strongest, because they have permanent dipole-dipole forces, Van der Waal's forces is the weakest bond of attraction.

Thus, the order from the weakest attraction to the strongest attraction is SrCl₂ > RbCl > YCl₃.

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Two moles or 78 g of potassium metal reacts with water to give one mole or 2 grams of hydrogen gas. Then 20 g of K will give 0.51 g of hydrogen gas.

Metals especially alkali metals and alkaline earth metals are highly reactive towards air and water. By reacting with water these metals produces their corresponding hydroxides.

Potassium reacts with water forms KOH as written below:

[tex]\rm 2K + 2H_{2}O \rightarrow 2 KOH + H_{2}[/tex]

As per this reaction, 2 moles of K produces 1 mole of hydrogen

atomic mass of K = 39 g/mol

mass of 2 K = 78 g

mass of H₂ = 2g

Then mass of H₂ produced from 20 g of K is:

mass of H₂ = (20 × 2) /78 = 0.51 g

Therefore, 0.51 g of hydrogen gas is produced by 20 grams of potassium metal.

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Answer:

A measure of an element's identity is determined by its atomic number, and its weight is determined by its atomic mass.

Explanation:

The amount of protons in the nucleus of an element's atom is known as the element's atomic number. It serves to identify and categorize the elements in the periodic table and is particular to each element. The chemical characteristics of an element are determined by its atomic number.

An element's atomic mass is its average atom's mass, which is typically expressed in atomic mass units (amu). It is the total number of protons and neutrons in the nucleus of an atom. The atomic mass can be a decimal and is not always a  number.

A measure of an element's identity is determined by its atomic number, and its weight is determined by its atomic mass.

Saturation concentration refers to the highest concentration of a substance that can exist in a solution in equilibrium with its solid or gaseous form. A saturation concentration less than 5 but greater than 2 is a relatively broad range, and many different chemicals could fall within this range depending on the conditions of the solution.

Examples of chemicals with saturation concentration less than 5 but greater than 2 include:

Calcium carbonate, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure

Iron(III) hydroxide, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure

Potassium chloride, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure

Ammonium chloride, which has a saturation concentration of around 2.5 g/L at room temperature and normal pressure

Sodium sulfate, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure

It's important to note that these are just examples, the saturation concentration of a chemical can vary depending on temperature, pressure, and other factors.

Answer:

the density of 10.002 g of water at 20°C in the units of g/mL is 0.998 g/mL

Explanation:

Density of 10.002g of water at 20°C in g/mL = 0.998 g/mL

Given that:

density of water at 20°C = 0.9982 g/mL

Density = mass / volume ---- ( 1 )

Where :  mass = 10.002 g

              Volume = ?

              Density = 0.9982 g/mL

∴ Volume = 10.002 / 0.9982   = 10.02 mL

back to equation ( 1 )

Density = 10.002 / 10.02 = 0.9982 g/mL ≈ 0.998 g/mL

Answer:In (a). 1st blank will be 1

2nd blank will be 4

3rd blank will be 3

(b).1-1

2-3

3-1

4-2

(c).1-1

2-12

3-12

4-11

(d).1-2

2-3

3-2

4-4

Explanation:

The heat that we are going to need so as to be able to vaporize the water is 40.4 kJ.

We know that the term thermal energy has to do with the energy that can be supplied to the water as heat when we raise the temperature of the water. In this case, we can see that we are dealing with  the thermal energy needed to completely vaporize 18.02 g of water at 100 degrees Celsius.

We know that the heat that is required can be obtained from the formula;

H = mL

m= mass of the water

L = latent heat of vaporization of water

H =  18.02 g * 2240 J/g

H = 40.4 kJ

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Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the volume of solid is 9.8L.

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically,

Density of solid = Mass of solid ÷volume marked on the graduated cylinder

mass of solid =24.5 g

density of solid =2.50 g/mL

substituting all the given values in the above equation, we get

2.50 g/mL= 24.5 g/ volume of solid

volume of solid= 9.8L

Therefore, the volume of solid is 9.8L.

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The mass in grams of water that are produced when 80. g of NaOH react with 73 g of HCl to form 117 g of NaCl and water is 36.0 g.

The equation of the reactions of sodium hydroxide and hydrochloric acid is given below:

NaOH + HCl ---> NaCl + H₂O

The mole ratio is 1 : 1 : 1 : 1

Moles of NaOH that reacted = 80/40

Moles of NaOH that reacted = 2 moles

Moles of HCl that reacted = 73/36.5

Moles of HCl that reacted = 2 moles

Moles of water produced will be 2 moles

Mass of water = 2 * 18 g/mol

Mass of water produced = 36.0 grams.

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The wavelength  you get for an angle of incidence of 30 degrees and reflection angle of 7 degrees is

2.3633166* 10^{-4}mm

Generally, To calculate the wavelength, you would need to use the equation for diffraction grating:

mλ = d(sin θi - sin θr)

Where

Plugging in the given values:

1λ = (1/1600 mm)(sin 30° - sin 7°)

Solving for λ:

λ = (1/1600 mm)(sin 30° - sin 7°)

λ = 2.3633166* 10^{-4}mm

This equation gives you the wavelength in the first-order diffraction

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Explanation:

The volume of O2 at 988 is 0.1634°C

Answer:

Explanation:

1. Identify the elements present in the compound. The compound N2O3 contains two elements: nitrogen (N) and oxygen (O).

2. Determine the type of compound. N2O3 is an ionic compound, as it contains two different elements.

3. Write out the full name of the compound. The full name of the compound is dinitrogen trioxide.

4. Identify the subscripts. The subscripts indicate the number of atoms of each element in the compound. In this case, there are two nitrogen atoms (N2) and three oxygen atoms (O3).

5. Assign the proper name. The proper name for N2O3 is dinitrogen trioxide.

The statements about substances X and Y are true are Y is the solvent in this solution, The presence of Y in the solution lowers the vapor pressure of X and if Y were not present, there would be more X particles in the gas above the liquid solution. Therefore, option A, B and C are correct.

A mixture in which one substance dissolves in the other is called a solution. The solute is the substance that dissolves. The solvent is the substance that does not dissolve. Salt water is an example of a solution.

In a mixture called a solution, every component is well combined. Solutions can contain solids, liquids, and gases and are regarded as homogenous mixes. A solute and a solvent makeup a solution. Any substance that dissolves in a solvent is referred to as a solute.

Thus, option A, B and C are correct.

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Answer:

Explanation:

a

Answer:

isolation, loneliness or psychological distress

Explanation:

In addition, older people are more likely to experience events such as bereavement, or a drop in socioeconomic status with retirement. Sadly these stressors can result in isolation, loneliness or psychological distress in older people. Mental health has an impact on physical health and vice versa.

To name ions from radicals, first identify the charge of the ion by counting the number of protons and electrons.

What do you mean ions?

Ions are atoms or molecules that have gained or lost one or more electrons and thus have a net electric charge. They are formed when an atom gains or loses electrons in a chemical reaction. Examples of common ions include sodium (Na+), chloride (Cl-), calcium (Ca2+), and magnesium (Mg2+).

Then determine the name of the ion based on its charge. For example, if the ion has a positive charge, it is called a cation; if it has a negative charge, it is called an anion. Finally, name the ion using the element's name and its charge. For example, a radical with two protons and one electron would be a cation and would be named “Hydrogen ion”.

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Answer:

Cellular Respiration: C6H12O6 + 6O2 → 6CO2 + 6H2O. 
Photosynthesis: 6CO2 + 6H2O → C6H12O6+ 6O.

Explanation:

:)