“A mixture is the chemical bonding of two or more substances in any proportion.” Is this statement true or false? Explain your answer.

Answer:

(A)

Density = Mass / Volume

So  

Mass = Density × Volume

[tex]= 0.867 g/mL \times 43.3mL = 37.5411 g Toluene[/tex]

[tex]1C_6 H_5 CH_3  + 9 O_2  > 7 CO_2  + 4 H_2 O[/tex]

Mole ratio of toluene : Oxygen is 1 : 9

[tex]$37.5411 g \text { Toluene } \times \frac{1 \text {mol} \text {toluene}}{92 g \text { toluene}} \times \frac{9 {mol} O_{2}}{1 \text {mol} \text { toluene }} \times \frac{32 g O_{2}}{1 {mol} O_{2}}=117 g O_{2}(\text {Answer})$[/tex]

(B)

1 mole of Toluene produces 7 moles of [tex]CO_2[/tex] gas and 4 moles of [tex]H_2 O[/tex] Vapour

So the mole ratio is 1 : 11

[tex]37.5411 g Toluene $\times \frac{1 \text { mol toluene }}{92 g \text { toluene }} \times \frac{11 \mathrm{mol} \text { gas }}{1 \text { mol toluene }} $$\\\\=4.49 \text { mol gaseous products (Answer) } $[/tex]

(C)

1mole contains [tex]6.022\times10^{23}[/tex] molecules

[tex]37.5411 g Toluene $\times \frac{1 \text { mol toluene }}{92 g \text { toluene}} \times \frac{4 \mathrm{mol} \mathrm{H}_{2} \mathrm{O}}{1 \mathrm{mol} \text { toluene }} \times \frac{6.022 \times 10^{23} \text { molecules } \mathrm{H}_{2} \mathrm{O}}{1 \mathrm{mol} \mathrm{H}_{2} \mathrm{O}} $\\\\$=9.82 \times 10^{23} \text { molecules } \mathrm{H}_{2} \mathrm{O} \text { (Answer) } $[/tex]

A. The mass of oxygen needed for complete combustion of the toluene is 117.52 g.

B. The total mole of gaseous products formed is 4.488 moles

C. The number of molecules of water vapor formed is 9.82×10²³ molecules

We'll begin by calculating the mass of toluene. This can be obtained as follow:

Volume = 43.3 mL

Density = 0.867 g/mL

Mass = Density × Volume

Mass of toluene = 0.867 × 43.3

C₆H₅CH₃ + 9O₂ —> 7CO₂ + 4H₂O

Molar mass of C₆H₅CH₃ = (6×12) + (1×5) + 12 + (3×1) = 92 g/mol

Mass of C₆H₅CH₃ from the balanced equation = 1 × 92 = 92 g

Molar mass of O₂ = 2 × 16 = 32 g/mol

Mass of O₂ from the balanced equation = 9 × 32 = 288 g

SUMMARY:

From the balanced equation above,

92 g of C₆H₅CH₃ reacted with 288 g of O₂

A. Determination of the mass of O₂ needed for the complete combustion of the toluene

From the balanced equation above,

92 g of C₆H₅CH₃ reacted with 288 g of O₂.

Therefore,

37.5411 g of C₆H₅CH₃ will react with = (37.5411 × 288)/92 = 117.52 g of O₂

Thus, 117.52 g of O₂ is needed for the reaction.

B. Determination of the total number of mole of the gaseous products formed

Molar mass of C₆H₅CH₃ = 92 g/mol

Mass of C₆H₅CH₃ = 37.5411 g

Mole = mass / molar mass

Mole of C₆H₅CH₃ = 37.5411 / 92

C₆H₅CH₃ + 9O₂ —> 7CO₂ + 4H₂O

From the balanced equation above,

1 mole of C₆H₅CH₃ produced 7 moles of CO₂

Therefore,

0.408 mole of C₆H₅CH₃ will produce = 0.408 × 7 = 2.856 moles of CO₂

C₆H₅CH₃ + 9O₂ —> 7CO₂ + 4H₂O

From the balanced equation above,

1 mole of C₆H₅CH₃ produced 4 moles of H₂O

Therefore,

0.408 mole of C₆H₅CH₃ will produce = 0.408 × 4 = 1.632 moles of H₂O

Mole of CO₂ produced = 2.856 moles

Mole of H₂O produced = 1.632 moles

Total mole = 2.856 + 1.632

Therefore, the total number of mole of the gaseous products formed is 4.488 moles

C. Determination of the number of molecules of water vapor formed.

From Avogadro's hypothesis,

1 mole of water = 6.02×10²³ molecules

Therefore,

1.632 moles of water = 1.632 × 6.02×10²³

1.632 moles of water = 9.82×10²³ molecules

Thus, the number of molecules of water vapor formed is 9.82×10²³ molecules

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Answer:

A. Erosion  

Explanation:

Erosion is the process in which soil and rock are worn away and transported by wind or water and transported to another location.

The image below shows how water has eroded a coastline.

B is wrong. Chemical weathering is the disintegration of rocks by reactions with water and the acids dissolved in it

C is wrong. Deposition is the process in which sediments carried by wind, water or ice are deposited at another location.

D is wrong. Physical weathering is the breakdown of rocks and soil by physical processes like the freezing of ice in the cracks of rocks.

erosion is the answer

The experiment titled "Investigating the Chemical Reaction between Baking Soda and Vinegar" explores the chemical change that occurs when baking soda (sodium bicarbonate) reacts with vinegar (acetic acid).

The objective is to observe the production of carbon dioxide gas and understand the resulting reaction. A balloon filled with baking soda is placed over a container of vinegar, and the baking soda is allowed to mix with the vinegar.

This causes a chemical reaction to take place, leading to the release of carbon dioxide gas. The balloon inflates due to the gas, and observations are made regarding the appearance, sounds, and size changes of the balloon.

The experiment demonstrates that the reaction between baking soda and vinegar creates new substances, indicating a chemical change. The experiment offers a hands-on way to learn about chemical reactions and their outcomes.

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The balanced chemical equation is CuSO4 + 4NH3 -> [Cu(NH3)4]SO4.

The balanced chemical equation for the reaction of copper(II) sulfate and concentrated ammonia to produce teramine copper(II) sulfate is:

CuSO4 + 4NH3 → [Cu(NH3)4]SO4

In this reaction, copper(II) sulfate (CuSO4) reacts with concentrated ammonia (NH3) to produce teramine copper(II) sulfate. The reaction forms a complex compound with the coordination number of copper changed from 2 to 4.

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Answer:

When we finish, the temperature would be 32.5℃

Explanation:

Density of water = mass/volume

So,

Mass of water = Density × Volume

[tex]\\\\$=1.0   \times  2.0 L$\\\\$=1.0 \frac{g}{m L} \times 2000 m L$\\\\$\quad=2000 g$[/tex]

[tex]$Q=m \times c \times \Delta T$[/tex]

where

[tex]\Delta T[/tex] = Final T - Initial T

Q is the heat energy in calories

c is the specific heat capacity (for water 1.0  cal/(g℃))  

m is the mass of water

plugging in the values  

[tex]$15000 \mathrm{Cal}=2000 \mathrm{g} \times 1.0 \frac{\mathrm{cal}}{\mathrm{g}^{\circ} \mathrm{C}} \times \Delta T$[/tex]

[tex]\\$\Delta T=\frac{15000 \mathrm{cal}}{2000 \mathrm{g} \times \frac{1.0 \mathrm{cal}}{g^{\circ} \mathrm{C}}}$\\\\$\Delta T=7.5^{\circ} \mathrm{C}$[/tex]

Final T = ∆T + Initial T

= 7.5℃ + 25℃ = 32.5℃ (Answer).

Answer:

0.135 km

Explanation:

1 km = 1000 meters

Answer:

The answer is B

Explanation:

The answer B talks about precautions, which you would have to know if you want to be safe during a science experiment, so I believe that is the best option.

Hope this helps brother :-)

Answer:

c

Explanation:

Answer:

A

Explanation:

Answer:

A.

Explanation:

the term precision refers to something that is has the most quality or good condition, being precise and exact.

Answer: The answer is B

Explanation:

This is because precision refers to how close two or more measurements are to each other.

Answer:

It is written exactly like that; Mg3N2

Explanation:

Roman numerals are used sometimes to show the charge of an ion that can be multiple charges.

The compound Mg3N2 is magnesium nitride, a binary ionic compound without Roman numerals in its formula; Roman numerals are used for metals with variable charges, not for those like magnesium with a fixed charge.

The compound Mg3N2 is known as magnesium nitride, which is a binary ionic compound. When writing chemical formulas for such compounds, you write the metal ion with its charge, followed by the nonmetal ion with its charge. Magnesium has a charge of +2 and nitrogen has a charge of -3. However, no Roman numerals are included in the formula Mg3N2 because magnesium has a fixed oxidation state of +2 and does not require indicating its charge through Roman numerals, unlike transition metals with variable charges. Roman numerals are used when naming ionic compounds of cations with variable charges such as iron in iron(II) chloride or iron(III) oxide.

b) three

this is because all integers are sig figs, and all numbers between integers are sig figs. This makes the 40,5 part of 40,500 significant. Place holder zeroes that are not after a decimal are not significant, so the last two zeroes of the number are not significant.

The correct option to the question is option (b).

To find:

Number of significant figures = ?

Significant figures are defined as the figures that are present in a number. It expresses the magnitude of a quantity to a specific degree of accuracy.

Some rules to detect the significant figures in a number are as follows:

It is evident from the given measurement that the digits '4', '0', and '5' are only significant and the last two zeroes do not have any significance.

Thus, the correct option is option (b).

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By using Physical properties unknown substance can be identified as it involves determination of a substance with out changing their composition or property include color, odor, taste, density, melting point etc.

Chemical properties can be observed or measured when a substance undergoes any type of changes chemically while Physical properties can be observed without changing anything.

In chemical property, chemical reaction is conducted to show the property of the substance while in physical property No chemical reaction occur.

Chemical properties related to chemical bonds while Physical properties do not have such a relationship.

Chemical properties include radioactivity, toxicity, flammability, heat of combustion,  etc. while physical properties include Molecular weight, boiling point, melting point, freezing point, volume, mass, length, density shape, solubility, etc.

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Final answer:

Chemists identify unknown substances by observing and measuring their physical and chemical properties, such as color, mass, and melting point, and comparing them to known values or by noting the chemical changes that they undergo.

Explanation:

To identify an unknown substance, chemists use various properties that can be observed or measured. Among these properties are physical properties like color, state (solid, liquid, or gas), mass (which is related to weight), and texture. Then there are chemical properties which can be discerned through chemical changes that the substance undergoes to produce new matter, as in the case of rust formation from iron, oxygen, and water. To determine if the substance is organic or inorganic, scientists may look for the presence or absence of carbon-based compounds.

Specific laboratory techniques like measuring the melting point can also be used to identify substances. By comparing the melting point of an unknown to literature values, and perhaps mixing a sample with a known substance and retesting, accurate identification can be achieved. If the melting point remains sharp and similar to the literature values, the unknown is likely correctly identified.

In a practical scenario using available lab equipment, such as a laser or ray box and a reference guide of optical properties, a substance's refractive index or how it bends light, might be used for identification. Therefore, physical and chemical properties serve as the basis for identifying unknown substances in chemistry.

He named the atom after the Greek word atomos, which means 'that which can't be split.'

The word 'atomos' means 'indivisible' in Ancient Greek, but modern science has shown that atoms can be divided into smaller subatomic particles. Despite this, the term 'atom' is still used today.

Answer:

option 1:

True

option 2:

True

option 3:

True

option 4:

False

Explanation:

we know from ideal gas equation that

[tex]PV=nRT[/tex]

or

[tex]\frac{PV}{T}=Constant[/tex]..............(1)

option 1:

True

Explanation

From equation 1 it is clear that if temperature remains constant than on increasing the volume of gas, pressure of gas will get decreases.

Option-2

True:

Explanation

From equation 1 it is clear that if volume of gas remains constant then on increasing the temperature, pressure of gas will increases.

Option-3

True

Explanation:

From equation 1 it is clear that if pressure of gas remains constant then on increasing the temperature volume of gas will increases.

Option-4

False

Explanation:

From equation 1 it is clear that if temperature of gas remains constant then on increasing the volume of gas, pressure of gas will decreases.

Three out of the four statements given align with the Gas Laws: Boyle's Law, Charles's Law, and Gay-Lussac's Law, respectively. The incorrect statement contradicts Boyle's Law.

Your question relates to the behavior of an enclosed gas under various conditions. This is governed by the Gas Laws, which state:

Therefore, the last statement is incorrect: If the temperature of a gas remains constant, increasing its volume will not increase its pressure - it will decrease it, according to Boyle's Law.

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Final answer:

Jim, who measures mass, may use kilograms, an appropriate unit for objects with considerable mass like textbooks. Smaller items, like bananas, would be measured in grams, while milligrams are used for very tiny masses in scientific settings.

Explanation:

The student whose measurement might be in kilograms is Jim, who measures mass. Kilograms are the appropriate unit for measuring objects with considerable mass, such as textbooks or humans. For example, a textbook has a mass of about a kilogram. In contrast, grams would be more suitable for measuring smaller objects like a banana, since a banana's mass is typically around 120 grams - far less than a kilogram. Milligrams are even smaller units, which would not be practical for everyday objects as they are usually used to measure tiny quantities, as might be done by scientists in a lab. In learning environments, balances or scales are used to measure mass, which can range from small milligrams up to a few kilograms.

To choose the appropriate tool for following measurements: 1. The volume of a water balloon would be measured using a measuring cup or another volumetric tool. 2. The length of a basketball court would be measured using a measuring tape or a laser distance meter. 3. The weight of an apple is most conveniently measured using a kitchen scale, which would likely display in grams. 4. The volume of a milk carton could be indicated on the carton but could also be measured using a graduated cylinder or measuring jug.

Answer:The molecules in a raw egg absorb the heat energy, they use this energy to change shape

Such a chemical reaction is said to be endergonic, which means 'energy in'.

Egg molecules will never undergo these reactions without the input of energy (usually in the form of heat)

I hope this helps, if not, let me know :)

Answer:

28,800

Explanation:

First convert hours to minutes.

60 minutes in an hour so: 24 x 60 = 1,440 (mins)

Second convert minutes to seconds.

60 seconds in a minute so: 1,440 x 60 = 86,400

Divide 86,400 by three. For every three seconds, you inhale once; 3:1 ratio.

86,400/3 = 28,800

This gives us our final answer. You inhale approximately 28,800 times in a 24 hour day.

Answer:

The answer Is fire burning, because the wood being burned is changing to carbon

Answer:

fire burning

Answer:

The statement given is true.

Explanation:

When we conduct an experiment we have to record the outcomes and maintain a log so that we can know number for later purposes, where the experiment is going and what conclusions we can expect.

To get the final answer or number the five outcomes that have been recorded here have to be averaged to get one value, this value would show  where the outcome’s value will lie.

Answer:

Whether there is life on Titan, the largest moon of Saturn, is at present an open question and a topic of scientific assessment and research. Titan is far colder than Earth, and its surface lacks stable liquid water, factors which have led some scientists to consider life there unlikely.

Explanation:

Answer:

The answer for this question would be B- An unbalanced force

Answer:

the answer is b

Explanation: I'm guessing

The correct statement is: "The water at 38 °C has faster-moving molecules than the sample at 295 K."

Temperature is a measure of the average kinetic energy of molecules in a substance. The Kelvin scale directly measures this kinetic energy, so 295 K represents a certain average kinetic energy.

However, 38 °C is equivalent to 311 K, which means the water molecules at this temperature have higher average kinetic energy. Since kinetic energy is directly related to the speed of molecules, water at 38 °C has faster-moving molecules compared to water at 295 K.

This is because at higher temperatures, molecules possess greater kinetic energy, resulting in faster movement.

Therefore, the statement accurately describes the comparison between the two samples of water.

Neon at 500K (Option D) will most closely approach ideal behavior because at this high temperature, its weak dispersion forces are easily overcome, allowing it to behave more like an ideal gas.

The key to determining which gas most closely approaches ideal behavior is to consider both the intermolecular forces and the conditions of temperature and pressure. Real gases deviate from ideal behavior under conditions of high pressure and low temperature because these conditions allow the volume and intermolecular forces of the gas particles to no longer be negligible. Therefore, a gas will behave more ideally at higher temperatures and lower pressures, where the kinetic energy of the gas particles is high enough to overcome intermolecular attractions.

In this case, even though all gases are at the same pressure, the temperature is different. Ammonia is a polar molecule with stronger intermolecular forces, specifically hydrogen bonding. In contrast, neon is a noble gas with very weak dispersion forces due to its non-polarity and small atomic size. Given the choices, neon at 500K (Option D) will most closely exhibit ideal behavior because the high temperature would provide sufficient kinetic energy to overcome the already weak dispersion forces between its atoms.

Answer:

Glass that will sink

Glass that will float

Glass that will not sink or float

Explanation:

Density is the property of matter that states the ratio of the amount of matter, its mass, to the space occupied by it, its volume.

So, the mathematical expression for the density is:

By comparing the density of a material with the density of a liquid, you will be able to determine whether object will float, sink, or do neither when immersed in the liquid.

The greater the density of an object the more it will try to sink in the liquid.

As you must have experienced many times an inflatable ball (whose density is very low) will float in water, but a stone (whose denisty is greater) will sink in water.

The flotation condition may be summarized by:

Glass that will sink

Glass that will float

Glass that will not sink or float

The sink-float method is used to identify the type of glass by determining its density. Glass with higher density sinks, glass with lower density floats, and glass with equal density neither sinks nor floats. The given examples demonstrate different outcomes based on the densities of the glass and the solutions.

The sink-float method is commonly used to identify the type of glass by determining its density. If the density of the glass is higher than the density of the solution it is immersed in, it will sink. If the density of the glass is lower than the density of the solution, it will float. If the density of the glass is equal to the density of the solution, it will neither sink nor float but stay suspended in the solution.

In the given examples:

Final answer:

There is a multitude of hair colors due to variations in melanin (eumelanin and pheomelanin) which are produced by melanocytes. These variations are genetically determined and influenced by multiple genes, resulting in a broad spectrum of hair shades.

Explanation:

The reason for the many different hair colors we see is primarily due to the pigmentation of hair follicles caused by two types of melanin: eumelanin and pheomelanin. The presence of more eumelanin leads to darker hair, while less eumelanin results in lighter hair. The levels and ratios of these pigments can change over time, which can cause a person's hair color to change. Furthermore, hair color can also vary between individuals due to the diverse genetic factors that determine the type and quantity of melanin produced by melanocytes. Hair color is an example of a polygenic trait, meaning it's controlled by multiple genes, such as MC1R, TYR, TYRP1, SLC24A5, and KITLG. Instead of being a simple black, brown, or blond, hair color encompasses a wide spectrum that can include various shades and hues, influenced by genetic variability and genetic penetration.

Answer:

The Photosynthesis Equation. The photosynthesis equation is as follows: 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 . Hope this helps you! :)

Answer: effusion of gas particles

Answer:

The correct answer is "effusion".

Explanation:

In chemistry, effusion is defined as the movement of gas particles trough a small hole from an area to another. This event is what most likely is occurring in the figure, where the red dots inside the container represent gas particles, the green circle is a barrier and the white dot at the middle represent the small hole that the gas particles go trough during the effusion process.

Answer:

The same density is an intrinsic property. A property that that does not depend on the amount.

Explanation:

The density of this 10 kg mass of water is [tex]10 \;g/cm^3[/tex]

Given the following data:

To find the density of A;

First of all, we would find the volume for this density.

[tex]Volume = \frac{Mass}{Density}\\\\Volume = \frac{1}{1}\\\\Volume = 1 \;cm^3[/tex]

Now, we can find the density of A;

[tex]Density = \frac{10}{1}[/tex]

Density of A = [tex]10 \;g/cm^3[/tex]

Therefore, the density of this 10 kg mass of water is [tex]10 \;g/cm^3[/tex]

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