you find that a material with a mass of 45 grams occupies a space of 1 cubic centimeter; what measurement with derived units could you determine?

Answer:

It is necessary because Trans-cinnamic is a limiting reagent in the mixture reaction while Bromine is the excess reagent

Explanation:

It is necessary to maintain excess bromine in the reaction mixture because Bromine is the excess reagent in the reaction mixture and if it's quantity is less it would consume the limiting reagent ( Trans-cinnamic ) completely . hence Bromine should maintain excess quantity in the reaction mixture

The given statement "The molar enthalpy of sublimation of a given substance can be determined if its enthalpies of fusion and vaporization are known" is true.

The molar enthalpy of sublimation of a substance can be determined if its enthalpies of fusion (melting) and vaporization (boiling) are known. The enthalpy of sublimation refers to the energy required to change a substance from the solid phase directly to the gaseous phase, bypassing the liquid phase.

The enthalpy change during sublimation can be calculated by considering the enthalpies of fusion and vaporization. When a substance undergoes sublimation, it first requires energy to melt from the solid phase to the liquid phase (enthalpy of fusion) and then additional energy to vaporize from the liquid phase to the gaseous phase (enthalpy of vaporization). The sum of these two enthalpies represents the overall energy change during sublimation.

Therefore, by adding the enthalpy of fusion and the enthalpy of vaporization, one can determine the molar enthalpy of sublimation for a given substance.

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An example of a physical change or a chemical change is Paper is shredded (physical change), an egg is fried (chemical change), wood is burned (chemical change), Dry Ice ( physical change), Newspaper Yellows in the sun (chemical change) and wax Melts on a hot Stove (physical change).

Physical changes alter a chemical material's appearance but it's not the chemical content.

Whenever a material mixes with another to generate a new compound, this is known as chemical change.

The example of physical change and chemical change.

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The variable that is unknown until the experiment is performed is the dependent variable.

In a scientific experiment, variables are classified into two main categories: independent variables and dependent variables. The independent variable is the variable that is intentionally manipulated or changed by the experimenter. It is under the control of the experimenter and is deliberately altered to observe its effect on the dependent variable.

On the other hand, the dependent variable is the variable that is measured or observed as the outcome or response in the experiment. It is the variable that is expected to change in response to the manipulation of the independent variable. The value or behavior of the dependent variable depends on the value or behavior of the independent variable.

Typically, before conducting an experiment, researchers have a hypothesis or an expectation about how the independent variable will affect the dependent variable. However, the actual outcome or result of the experiment, which is observed through the measurement of the dependent variable, remains unknown until the experiment is performed.

The purpose of conducting the experiment is to gather empirical data and observe the changes in the dependent variable to analyze the relationship between the independent and dependent variables.

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Hence, the COD of glucose (C6H12O6) is 1512 mg/L, the COD of biomass (C5H7NO2) is 1023.14 mg/L, and the COD of the mixture is 2535.14 mg/L.

Chemical Oxygen Demand (COD) is the amount of oxygen consumed by a substance or group of substances present in the water when they are oxidized chemically. It is a common test to measure the ability of wastewater to be treated biologically and is an indirect measure of the quantity of organic matter present in the wastewater.

To determine COD of glucose and biomass for secondary wastewater treatment process we need to calculate the mass of reactants, COD of glucose, COD of biomass, and finally the COD of the mixture.

The balanced equation for the reaction is:

C6H12O6 + 6 O2 → 6 CO2 + 6 H2O
C5H7NO2 + 7/2 O2 → 5 CO2 + 1.5 H2O + N

The COD of glucose and biomass can be calculated by mass balance expression,

COD mass balance = mass of reactants x stoichiometric coefficients x theoretical oxygen demand (ThOD) of the reactant / Volume of sample

For Glucose (C6H12O6):

COD mass balance = (6 x 180/6) x 1.42/1

COD mass balance = 1512 mg/L

For Biomass (C5H7NO2):

COD mass balance = (5 x 119/7) x 4.54/1

COD mass balance  = 1023.14 mg/L

The COD of the mixture:

COD of mixture = COD of glucose + COD of biomass

= 1512 + 1023.14

= 2535.14 mg/L

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Two Cl-atoms form a sigma bond with sp3 hybrid orbitals. Thus, SCl2 has sp3 hybridization.

The Lewis structure shows us that the carbon atom makes 4 sigma bonds to hydrogen and has no non-bonding electron pairs. The central carbon atom combines its 2s, 2px, 2py, and 2pz valence orbitals to make four, 2sp3 hybrid orbitals. Each one of these combines with a 1s atomic orbital from a hydrogen atom.

What is hybridization of SCl2?

In its most stable state, Sulfur acts as the central atom and forms two covalent bonds with the Chlorine atoms. It also possesses two lone pairs. Due to the presence of 4 electron domains and its steric number being 4, the hybridization of SCl2 is given by sp3.

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Answer:      The theory of plate tectonics tells us that the earth's surface sits on plates that shift due to the built up pressure underneath. When the pressure gets too much, it has to escape somewhere so it goes to the edges of the plate and causes earthquakes. This in turn causes the surface to shift.

Answer:

A and C

Explanation:

When you are cleaning glass you should wear gloves so you don't cut yourself. When you are cleaning blood of a surface you should also wear gloves so that the blood has no way of getting inside of you.

Answer:

A, C,

Explanation:

A, because you can cut your self.

B, because so you dont touch the blood

Answer:

We know that an antacid is a base that can neutralize the stomach acid when ingested. The student observed that a soluble antacid tablet reacted faster in relieving pain due to the excess acid secreted in the stomach. So, the problem that can be studied is the effect of temperature on the rate of neutralization of stomach acid by the antacid. The independent variable is the one the student is going to vary that is the temperature. The dependent variable is the rate of reaction or the time taken for an antacid tablet to neutralize the acid present in stomach. The controlled variable is the tablet taken, that is the student should use a specific antacid tablet to ensure that the rate of reaction or the time taken for the antacid tablet to neutralize the acid present in stomach is not affected by the chemical composition of tablet.

Explanation:

Hope u understood.

The tendency of a mineral to break and produce smooth, curving, shell-shaped surfaces is termed "conchoidal fracture." This characteristic is observed in certain minerals due to their specific atomic structure and bonding patterns. Minerals with this property exhibit a predictable breakage pattern, creating distinctive curving surfaces that resemble the shape of a seashell or a conch.

Conchoidal fracture is commonly seen in minerals with strong covalent or ionic bonds, such as quartz and obsidian. These minerals lack distinct cleavage planes, so when they break, they tend to form these smooth, curved surfaces. The absence of cleavage planes is a result of the uniform distribution of bonds throughout the mineral, which causes them to fracture in a more random manner, creating the curving shape.

In summary, the term "conchoidal fracture" refers to the tendency of a mineral to break and produce smooth, curving, shell-shaped surfaces. This property is observed in minerals with strong covalent or ionic bonds and a lack of distinct cleavage planes, such as quartz and obsidian. The unique breakage pattern is due to the uniform distribution of bonds within the mineral's structure, resulting in a random, curved fracture pattern.

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The property of the covalent compound that is influenced by ionic character is boiling point. Option B

We know that for compounds, the kind of bonds that they have are usually neither here nor there. The bonds would have an ionic character and also a given amount of the covalent character.

We must note that the ionic character of a bond is very important when we discuss intermolecular interactions and they do affect the boiling points of the substances very much.

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As a result, it will take 48 hours for potassium-42 radiation levels to drop to 1/16 of their initial levels.

The average annual radiation exposure per person in the United States is 6.2 millisieverts (620 millirem), according to the National Council on Radiation Protection and Measurements (NCRP). These average dose's sources are depicted in the pie chart below. The average annual radiation exposure per person in the United States is 6.2 millisieverts (620 millirem), according to the National Council on Radiation Protection and Measurements (NCRP). These average dose's sources are depicted in the pie chart below. The primary source of exposure for the majority of people is naturally occurring background radiation. Although they can exceed 50 mSv/yr, they normally fall between 1.5 and 3.5 millisievert per year.

As low as reasonably possible, but not more than 5,000 millirems. It is advised that the total lifetime exposure not exceed the age times 1,000 millirems. The annual occupational limit for minors under 18 who are exposed to radiation is 500.

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Answer:

Whats the sentence

Explanation:

Answer:

Atoms form chemical bonds to satisfy the octet rule and to become stable.

Got it right on Edg. 2020, hope this helps!

Answer:

iris is what controls the amount of light  that enters the eye

Explanation:

Answer:

Iris

Explanation:

The Iris opens and closes to control the amount of light entering the eye through the pupil.

Answer:8

Explanation:

The initial direction of the deflection of charged particles is determined by the Lorentz force, which acts perpendicular to both the velocity of the charged particle and the magnetic field it is exposed to.

When a charged particle moves through a magnetic field, the magnetic force acts on it, causing it to deflect. The direction of the deflection is given by the right-hand rule, where the thumb points in the direction of the velocity, the fingers indicate the direction of the magnetic field, and the palm shows the direction of the deflection.

The initial direction of deflection for charged particles depends on the interplay between the velocity of the particle and the magnetic field. This principle is applied in devices like particle accelerators, cathode ray tubes, and mass spectrometers, where the manipulation of charged particle trajectories is crucial. Understanding the relationship between charged particles, magnetic fields, and the Lorentz force allows for precise control and analysis of charged particle motion in various scientific and technological contexts.

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Answer:

true

Explanation:

hope this helps!

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An acid is hydrogen and one or more nonmetals. This statement is true. Therefore, option A is correct.

A nonmetal is a chemical element that typically doesn't have a lot of metallic characteristics; examples include colourless vapors and glossy solids. When compared to metals, nonmetals' electrons exhibit different behaviour.

Natural substances known as non-metals are brittle and thermally and electrically inert (can not be easily rolling, moulding, extruding or pressing). The non-metallic elements in the periodic table are hydrogen, carbon, nitrogen, oxygen, phosphorus, arsenic, and selenium.

Non-metals are substances that lack luster, sonority, ductility, malleability, and are poor conductors of heat and electricity. They are soft and dull in appearance. Take oxygen, hydrogen, sulphur, etc. as examples.

Thus, option A is correct.

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Answer:

metallic

Explanation:

Answer:

because it's the glass that goes on eyeglasses

Answer:

Because it is transparent

ANSWER

EXPLANATION

Given that

The mass of the gas is 10.0g

The volume of the gas is 7.69L

The pressure of the gas is 1.00 atm

The temperature of the gas is 27 degrees Celcius

Follow the steps below to find the molar mass of the gas

Step1; Assume the gas is an ideal gas

Step 2; Find the number of mole of the gas using the equation above

Step 3; find the molar mass of the sample

The equation is balanced.

The number of P atoms in the reactant side is 4 and the number of P atoms in the product side is also 4.

The number of O atoms in the reactant side is 16 and the number of O atoms in the product side is also 16.

The number of H atoms in the reactant side is 12 and the number of H atoms in the product side is also 12.

These results are in accordance with the law of conservation of mass.

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Answer:

matter/mass is made up of anything you see touch and fell

Answer:

Explanations:

Given the following electronegativity of three elements as:

The volume of CO2 produced from 2.0 L of O2 assuming an excess of CO is 15.96 mL.

For the given reaction, the volume of CO2 that can be produced from 2.0 L of O2, assuming an excess of CO, can be calculated as follows:

Given reaction:2CO(g) + O2(g) → 2CO2(g)From the given reaction, it can be seen that 2 moles of CO2 can be produced from 1 mole of O2. That is, the stoichiometric coefficient of O2 is 1 in the balanced equation.

Therefore, the number of moles of O2 present in 2 L of O2 can be calculated using the ideal gas equation:

PV = nRT

Where, P = pressure of the gas

V = volume of the gas

n = number of moles of the gas

R = universal gas constant

T = temperature of the gas

From the given data, the volume of O2 is 2.0 L. Assuming temperature and pressure are constant, the ideal gas equation can be rearranged as:

n = PV/RT

Where,

P = 1 atm (standard pressure)

R = 0.08206 L.atm/mol.K (universal gas constant)

T = constant

Substituting the given values, we get:

n = (1 atm) (2.0 L) / (0.08206 L.atm/mol.K)

T = constant

n = 0.0976 mol

Thus, 0.0976 mol of O2 is present in 2.0 L of O2. As per the balanced chemical equation, 2 moles of CO2 can be produced from 1 mole of O2. Therefore, the number of moles of CO2 produced from 0.0976 mol of O2 can be calculated as:

(2/1) × 0.0976 = 0.1952 molThus, 0.1952 mol of CO2 is produced from 2.0 L of O2 assuming an excess of CO.The volume of CO2 produced can be calculated using the ideal gas equation:

PV = nRT

Where, P = 1 atm (standard pressure)

V = unknown (to be calculated)

n = 0.1952 mol

R = 0.08206 L.atm/mol.K

T = constant

Substituting the given values, we get:

(1 atm) (V) = (0.1952 mol) (0.08206 L.atm/mol.K)

T = constant

V = (0.1952 mol) (0.08206 L.atm/mol.K) / (1 atm)

V = 0.01596 L or 15.96 mL.

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The IUPAC name for the compound H₃C-CH₂-CH-CH₂ is 3-methylbutane.

Let's break down the naming process step by step :

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1,700.4 kJ of energy is given off when 288 g of Fe is produced.

The thermochemical equation \(2Al+Fe_{2} O_{3} - > Al_{2} O_{3} + 2Fe\) ΔH = −850.2 kJ describes the energy change that occurs when aluminum (Al) reacts with iron(III) oxide (\(Fe_{2} O_{3}\)) to form aluminum oxide (\(Al_{2} O_{3}\)) and iron (Fe). The ΔH value of −850.2 kJ represents the amount of heat energy released or absorbed during the reaction.

In this case, a negative ΔH value indicates that heat energy is released, meaning that the reaction is exothermic.

To determine the amount of energy given off when 288 g of Fe is produced, we need to determine how many moles of Fe are produced. We can do this using the molar mass of Fe, which is 55.845 g/mol.

Moles of Fe = 288 g / 55.845 g/mol = 5.16 moles

Next, we multiply the number of  of Fe by the ΔH value to get the total energy change:

Energy change = 5.16 moles x −850.2 kJ/mole = −4,395.4 kJ

So, 1,700.4 kJ of energy is given off when 288 g of Fe is produced. This 1,700.4 kJ of energy is given off when 288 g of Fe is produced.

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Complete Question:

Given the thermochemical equation \(2Al+Fe_{2} O_{3} - > Al_{2} O_{3} + 2Fe\) ΔH = −850.2 kJ how much energy is given off when 288 g of Fe are produced?

The ethanol sample boiling at 81°C is least pure because it has a higher boiling point than pure ethanol (78°C). The difference in boiling points indicates the presence of impurities in both samples.

The boiling point of a substance is influenced by the intermolecular forces between its molecules. Pure ethanol has a boiling point of 78°C because its intermolecular forces are relatively weak. When impurities are present, they can disrupt the intermolecular forces and raise the boiling point.

In this case, the ethanol sample boiling at 81°C has a higher boiling point than pure ethanol, indicating the presence of impurities. The other sample boiling at 79°C is closer to the boiling point of pure ethanol, suggesting it is relatively purer compared to the one boiling at 81°C. The greater the difference from the boiling point of pure ethanol, the more impurities are likely present in the sample.

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Answer: Hot water freezes faster.

Explanation: It is because of the Mpemba effect taking place, and even though it seems impossible, it could have less dissolved gas in it, or even take up less mass because of this.

The pH of a 1.25 x 10^-3 M NaOH solution is approximately 9.81. The given options do not include the correct answer for the pH of a 1.25 x 10^-3 M NaOH solution.

A pH scale is used to calculate how acidic or basic a solution is.

In this question, we are given the molarity of a sodium hydroxide (NaOH) solution and we need to calculate its pH.

The formula for calculating pH is:

pH = -log[H+],

In the context of the pH calculation, [H+] represents the molar concentration of hydrogen ions present in the solution.

For a basic solution like NaOH, we can use the formula:

[OH-] = Kw / [H+],

where Kw is the ionization constant for water, which is 1 x 10^-14 at 25°C.

We can then use the relationship [OH-] x [H+] = Kw to calculate [H+] and then use the pH formula to calculate pH.

Molarity of NaOH solution = 1.25 x 10^-3 M

First, we need to calculate the hydroxide ion concentration ([OH-]) using the formula:
[OH-] = Kw / [H+]
[OH-] = 1 x 10^-14 / (1.25 x 10^-3)
[OH-] = 8 x 10^-12 M

Next, we can use the relationship [OH-] x [H+] = Kw to calculate [H+]:
8 x 10^-12 x [H+] = 1 x 10^-14
[H+] = 1.25 x 10^-3 M / 8 x 10^-12
[H+] = 1.56 x 10^-10 M

Now that we have the hydrogen ion concentration, we can use the pH formula to calculate pH:
pH = -log[H+]
pH = -log(1.56 x 10^-10)
pH = 9.81

Therefore, the pH of a 1.25 x 10^-3 M NaOH solution is approximately 9.81. The given options do not include the correct answer for the pH of a 1.25 x 10^-3 M NaOH solution.

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Answer:

The Rutherford atomic model stated that an atom is mostly an empty space that consist of nucleus and electrons, where nucleus is positively charged and electrons are negatively charged.

But Rutherford atomic model missed to add the quantum mechanics or energy level for electrons. Rutherford was unable to make understand the planetary movement of electrons around nucleus and later Bohr's model explained it.

Hence,  Rutherford's model of the atom missed to explain the planetary movement of electrons around nucleus.