What is NOT a sign of chemical change?

A. New Color
B. New gas
C. New temperature
D. New state of matter

The new volume of the gas in the balloon when the pressure is doubled is determined as 11.2 L.

The new volume of the balloon is determined by applying general gas equation as shown below

P₁V₁/T₁ = P₂V₂/T₂

Where;

\(\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2} \\\\V_2 = \frac{P_1V_1T_2}{T_1P_2} \\\\V_2 = \frac{1 \times 22.4 \times 273}{273 \times 2} \\\\V_2 = 11.2 \ L\)

Thus, the new volume of the gas in the balloon when the pressure is doubled is determined as 11.2 L.

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70.6 litres of bromine trifluoride is required to produce 106 liters of fluorine gas according to the following reaction provided that all gases are at the same temperature and pressure.

Since, 2BrF3 (g) gives Br2 (g) + 3 F2 (g)

Here 2 mole BrF3 produces 3 mole F2

If volume produced of F2 is 106 litres

Therefore, volume of BrF3 =?

Since, v1 is directly proportional to n1

Therefore, v1/n1 = v2/n2

v1/2moles = 106 litres/3 moles

v1= 212/3 = 70.6 litres

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Answer:

By the wavelength of the light transmitted by it.

Explanation:

The color of a transparent object is determined by the wavelength of the light transmitted by it. An opaque object that reflects all wavelengths appears white; one that absorbs all wavelengths appears black.

Answer: If a reaction has a low rate that means the molecules combine at a slower speed than a reaction at a higher rate

Explanation:

The rate of a reaction for a chemical reaction is change in concentration of reactants or change in concentration of products per unit time.Rate of reaction depends on type and nature of reaction.It also depends onthe physical state of reactants, number of reactants and complexity of reaction.

The rate of reaction:

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Answer:

All properties of matter are either physical or chemical properties and physical properties are either intensive or extensive. ... Physical properties can be measured without changing a substance's chemical identity. Chemical properties can be measured only by changing a substance's chemical identity.

Explanation:

225 milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.

The volume of a substance can be calculated using the following formula:

molarity = no of moles ÷ volume

no of moles of baking soda (NaHCO3) = mass ÷ molar mass

Molar mass of baking soda = 84.007g/mol

no of moles = 15g ÷ 84.007g/mol = 0.18mol

0.8 = 0.18/volume

volume = 0.23L equivalent to 225mL

Therefore, 225 milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.

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225 millilitres of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.

\(Molality = \frac{Moles \;solute}{Volume of solution in litre}\)

\(Moles of baking soda (NaHCO_3) =\frac{mass}{molar \;mass}\)

Molar mass of baking soda = 84.007g/mol

\(Moles of baking soda (NaHCO_3) =\frac{15g}{84.007g/mol}\)

\(Moles of baking soda (NaHCO_3) = 0.18mol\)

Now, calculating volume with the molarity formula:

Molality = \(\frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}\)

0.8 = \(\frac{0.18 }{Volume \;of \;solution \;in \;litre}\)

Volume = 0.23L equivalent to 225mL

Therefore, 225 milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.

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crystallization is a process which helps to separate a pure solid from a solution in its crystal form. This is the in use to purify solid. For an example the salt we get from seawater can have many impurities in it. Hence, the process of crystallization is in use to remove these impurities.

Sugar and salt are examples of products where crystallization does not only serve as separation/purification technique, but where it is also responsible for getting crystals with the right size (and shape) for further application of the products.

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Answer:

Crystallization is the process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal. Some of the ways by which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas.

Sugar and salt are two mixtures that can be seperated by crystallization

Explanation:

Answer:

sup brö how is it back home?

Explanation:

just curious you know

The three technologies used to convert biomass energy into heat and electricity are Combustion, Gasification, Anaerobic Digestion.These technologies enable the efficient utilization of biomass resources, reducing reliance on fossil fuels and contributing to renewable energy generation.

Combustion: Biomass combustion is a widely used technology that involves burning biomass materials, such as wood, agricultural residues, or dedicated energy crops, to produce heat and electricity. In this process, biomass is burned in a controlled manner, and the heat generated is used to produce steam, which drives a turbine connected to a generator. The combustion process releases carbon dioxide (CO2), but since biomass is considered a renewable energy source, the CO2 emitted is part of the natural carbon cycle and does not contribute to net greenhouse gas emissions.

Gasification: Biomass gasification is a thermochemical process that converts biomass into a combustible gas known as syngas. The biomass is subjected to high temperatures in a low-oxygen environment, resulting in the production of syngas, which mainly consists of carbon monoxide (CO), hydrogen (H2), and traces of other gases. The syngas can be used directly for heating purposes or for the production of electricity through internal combustion engines, gas turbines, or fuel cells.

Anaerobic Digestion: Anaerobic digestion is a biological process that breaks down biomass, such as animal manure, crop residues, or organic waste, in the absence of oxygen. During the anaerobic digestion process, microorganisms break down the biomass, producing biogas, which is primarily composed of methane (CH4) and carbon dioxide (CO2). The biogas can be combusted to produce heat and electricity, or it can be upgraded to biomethane and injected into the natural gas grid or used as a transportation fuel.

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The term that best describes the role of certain metal ions and coenzymes in metabolic processes is "catalyst." These ions and coenzymes act as catalysts, facilitating chemical reactions and speeding up metabolic processes within the body.

The term that best describes the role of certain metal ions and coenzymes in metabolic processes is "cofactor." A cofactor is a non-protein chemical compound or metal ion that is required for an enzyme's activity.

It plays an essential role in various metabolic processes by stabilizing the enzyme structure, facilitating substrate binding, or participating in catalytic reactions.

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C.

Explanation:

As a pendulum swings from its highest to its lowest position along an arc, what happens to its kinetic energy and potential energy? The potential energy decreases while the kinetic energy increases.

The Lewis structure for CH3CHCCH2 can be drawn as follows:

H     H
|     |
H-C=C-C≡C-H
|     |
H     H

#bonds between the red carbon and the blue carbon: 1
#bonds between the blue carbon and the green carbon: 2
#bonds between the green carbon and the grey carbon: 1


Based on this Lewis structure, you can count the number of bonds between the specified carbons:

1. If we assume the red carbon is the first carbon (leftmost), and the blue carbon is the second carbon, there is one bond between them (a single bond).
2. If we assume the blue carbon is the second carbon, and the green carbon is the third carbon, there are two bonds between them (a double bond).
3. If we assume the green carbon is the third carbon, and the grey carbon is the fourth carbon, there is one bond between them (a single bond).

So, the answers are: 1 bond, 2 bonds, and 1 bond, respectively.

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Answer: Magnesium loses two electrons whilst sulfur gains tw

a. The steam at the initial state is superheated since it is in a rigid cylinder. The temperature at the initial state is 200°C. The specific internal energy at the initial state can be obtained from the steam tables.

b. The pressure at the final state is the same as the initial pressure, which is 10 MPa.

c. If the final temperature is higher than the saturation temperature, the steam will be in the superheated state (x = 1).

d. If the steam is in the superheated state (x = 1), the specific internal energy can be obtained from the superheated steam tables based on the given temperature.

In this problem, we are given the initial state of steam in a rigid cylinder at a known pressure and volume. We are then asked to determine various properties of the steam at the final state after it has cooled.

a. The type of steam is determined based on its state. Since the steam is in a rigid cylinder, it is considered superheated. The temperature at the initial state is given as 200°C. The specific internal energy at the initial state can be obtained from the steam tables.

b. Since the volume remains constant throughout the process, the pressure at the final state is the same as the initial pressure, which is given as 10 MPa.

c. To determine the quality of the steam at the final state, we need to compare the final temperature with the saturation temperature corresponding to the given pressure. If the final temperature is lower than the saturation temperature, the steam will be in the saturated liquid state (x = 0). If the final temperature is higher than the saturation temperature, the steam will be in the superheated state (x = 1).

d. Since the pressure at the final state is the same as the initial pressure, the specific internal energy at the final state depends on the quality of the steam. If the steam is in the saturated liquid state (x = 0), the specific internal energy can be obtained from the steam tables for the corresponding pressure and temperature. If the steam is in the superheated state (x = 1), the specific internal energy can be obtained from the superheated steam tables based on the given temperature.

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The gas is Argon.

To identify the gas, we need to compare the number of moles calculated for each gas with the given density.

Let's calculate the number of moles for each gas and compare them:

Given:

Density = 1.17 × 10^(-6) g/cm^3

Pressure = 1.00 × 10^(-3) atm

Temperature = 60.0 °C = 60.0 + 273.15 = 333.15 K

Molar mass of Oxygen (O2) = 32.00 g/mol

Molar mass of Neon (Ne) = 20.18 g/mol

Molar mass of Hydrogen (H2) = 2.02 g/mol

Molar mass of Chlorine (Cl2) = 70.90 g/mol

Molar mass of Argon (Ar) = 39.95 g/mol

Molar mass of Nitrogen (N2) = 28.02 g/mol

For Oxygen (O2):

n = (PV) / (RT) = (1.00 × 10^(-3) atm) × (1.17 × 10^(-6) g/cm^3) / ((0.0821 L × atm/(mol × K)) × 333.15 K)

n = 5.88 × 10^(-12) mol

For Neon (Ne):

n = (PV) / (RT) = (1.00 × 10^(-3) atm) × (1.17 × 10^(-6) g/cm^3) / ((0.0821 L × atm/(mol × K)) × 333.15 K)

n = 9.26 × 10^(-12) mol

For Hydrogen (H2):

n = (PV) / (RT) = (1.00 × 10^(-3) atm) × (1.17 × 10^(-6) g/cm^3) / ((0.0821 L × atm/(mol × K)) × 333.15 K)

n = 9.26 × 10^(-11) mol

For Chlorine (Cl2):

n = (PV) / (RT) = (1.00 × 10^(-3) atm) × (1.17 × 10^(-6) g/cm^3) / ((0.0821 L × atm/(mol × K)) × 333.15 K)

n = 2.58 × 10^(-12) mol

For Argon (Ar):

n = (PV) / (RT) = (1.00 × 10^(-3) atm) × (1.17 × 10^(-6) g/cm^3) / ((0.0821 L × atm/(mol × K)) × 333.15 K)

n = 4.64 × 10^(-12) mol

For Nitrogen (N2):

n = (PV) / (RT) = (1.00 × 10^(-3) atm) × (1.17 × 10^(-6) g/cm^3) / ((0.0821 L × atm/(mol × K)) × 333.15 K)

n = 6.45 × 10^(-12) mol

Comparing the number of moles calculated for each gas with the given density, we find that the gas with the closest value is Argon (Ar). Therefore, the gas is Argon.

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The kinetic energy of a 100kg cart moving at a speed of 6 m/s is 1800 J.

Kinetic energy is defined as the energy that an object has because of its motion. If you want to accelerate an object, then you must apply a force. Force can be applied when work is done by us. After work has been done, the energy will get transferred to the object, and the object will be moving with a new constant speed.

K.E = 1/2 mv²

m = 100 kg

v = 6 m/s

Substituting the values we get,

K.E = 1/2 × 100 × 6 × 6

⇒ K.E = 1800 J

Hence, The kinetic energy of a 100kg cart moving at a speed of 6 m/s is 1800 J.

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Answer:

It is basic

Explanation:

Soaps are always basic, and basic compounds have a bitter taste.

The first one appear to be a pan with some liquid heating up.

The beginning state is liquid, the phase change type is a vaporization and its ending state is gas.

The second one seems to be a ice cube melting.

Its beginning phase is solid, the phase change type is fusion, and its ending state is liquid.

The third one is water, or other liquid, making clouds.

The beginning state is liquid, the phase change type is a vaporization and its ending state is gas.

The fourth illustration seems to be an aluminium can. There aren't really a phase change happening, but when we open the aluminium can containing gaseous drink, there are molecules of gas diluted into the liquid and some of it encouter each other to make a bubble of the gas and is released. It is not an actually phase change, it is the reverse process of diluting gas into liquid. Initially it is diluted gas, it gets released and in the end it is in gas phase.

C. If  blood pressure decreases, filtration in the kidneys decreases.

D. If more blood returns to the heart, the ventricles contract more forcefully to pump it out, and this raises blood pressure.

The maintenance of blood pressure is defined as the high use of sodium in your diet and the low use of potassium in your diet can cause hypertension. It is also important to use those foods which are free from fats. It is also important that we should use fruits, vegetables, and grains in excessive amounts for the maintenance of blood pressure and for a healthy diet.

High blood pressure 190/110 mm Hg can cause the main vital organs of the body like the brain, heart, and kidney too. There are three factors that contribute to blood pressure which are resistance, blood viscosity, and blood vessel diameter.

So we can conclude that blood pressure is the pressure of circulating blood against the walls of the blood vessels.

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Which of the following statements are true of the maintenance

of blood pressure (BP)? (Read carefully and select all of the correct statements.)

A. Norepinephrine stimulates vasoconstriction in skin, viscera, and skeletal muscles, all of which lower BP.

B. Aldosterone stimulates the reabsorption of Na+ ions by the kidneys, which lowers BP.

C. If BP decreases, filtration in the kidneys decreases.

D. If more blood returns to the heart, the ventricles contract more forcefully to pump it out, and this raises BP.

E. If BP decreases, the kidneys secrete the enzyme renin, which stimulates the secretion of epinephrine to prevent a further decrease.

F. The hormone ANP increases the excretion of K+ ions by the kidneys, which helps conserve water and raise BP.

G. The hormone ADH helps the kidneys conserve water and helps prevent a decrease in BP.

H. The elasticity of the large arteries helps decrease diastolic BP.

Answer:

The skillet got rusted.

Explanation:

In the context, Kelly kept the iron skillet in the sink which is full of water. After washing the dishes, she noticed the skillet's color is starting to change. She kept it for dry on the rack but the day later the skillet was ruined and damaged.

It was a chemical and physical change in the property of the metal where the iron skillet which was kept in the sink full of water oxidized due to the water content and the iron got oxidized to form form iron oxide which is known as rust. It damages the utensil and the color changes to muddy red or brownish red.

The pathways that would be necessary to carry you to the leaves of these trees are apoplastic, bulk flow, symplastic and transmembrane. Hence, option 5 (all of the above) is correct.

Generally, the apoplast is defined as the space outside the plasma membrane consisting of intercellular spaces where the material diffuses freely.

Generally, mass flow or bulk flow is defined as the movement down a pressure gradient ( a pressure gradient in plants is observed due to variations in solute concentration) or the temperature gradient of substances in bulk or in masses.

Symplast is generally considered as the living part of the plant tissue without the presence of a cell wall and intercellular spaces in it.

Generally, the transmembrane protein (TP) is a type of integral membrane protein which spans the entirety of the cell membrane. Hence, option 5 is correct.

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Answer:

no

Explanation:Unused chemicals are never returned to their original containers because you will be contaminating the chemical. Dispose of unused chemicals in the proper containers.

Inactivation of the beta-2 adrenergic receptor will most likely result in an increase in the cell's rate of glycogen production.

According to Figure 1, the stimulation of glycogen breakdown and inhibition of glycogen synthesis result from the activation of beta-2-adrenergic receptors. Because glycogen synthesis is no longer hindered, the immediate result of the deactivation of beta-2-adrenergic receptors is an increase in the rate of glycogen synthesis in cells. Because glycogen phosphorylase may have been deactivated, the breakdown of glycogen in cells is no longer encouraged.

This multiple-choice query is:

A. Cyclic AMPAMP concentrations within cells will rise.

B. Protein kinase A's enzymatic activity will rise.

C. Glycogen phosphorylase will become more active.

D. The cell's rate of synthesising glycogen will quicken.

The correct option is D.

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When the first subunit of hemoglobin binds to oxygen (O2), it undergoes a conformational change that increases the affinity of the remaining subunits for oxygen. This is known as the allosteric effect.

Specifically, the binding of O2 to one subunit of hemoglobin causes a shift in the quaternary structure of the protein, which stabilizes the R-state (relaxed state) and promotes the binding of O2 to the remaining subunits. Therefore, after O2 binding, hemoglobin would be in the R-state, which has a higher affinity for O2 than the T-state (tense state) that predominates in the absence of O2.
                                            The allosteric effect on O2 binding to the second subunit of hemoglobin after the first subunit binds to O2 results in an increased affinity for oxygen in the remaining subunits. This effect is known as cooperative binding. After the first subunit of hemoglobin binds to O2, the hemoglobin undergoes a conformational change from the T (tense) state to the R (relaxed) state, making it easier for the subsequent subunits to bind to O2.

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The statement that describe nonspontaneous reaction is the The Gibbs free energy for the reaction is positive.

Nonspontaneous reaction is a type of chemical reaction that does not support or give room for products to be formed at given conditions. For a reaction to be nonspontaneous,it must be an endothermic reaction that is heat is absorbed from the surrounding and there must be decrease in entropy, or increase. The Gibbs free energy is positive.

Therefore, The statement that describe nonspontaneous reaction is the The Gibbs free energy for the reaction is positive.

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The spontaneous reactions have a positive enthalpy and a decrease in the entropy. In a non-spontaneous reaction, The Gibbs free energy for the reaction is positive. The correct option is C.

The chemical reactions which require an energy input to proceed or it can or cannot take place without the influence of external factors can be defined as the non-spontaneous reaction. In this case the total energy of the products is higher than that of the reactants.

Gibbs energy change is a better parameter which is used to determine the spontaneity or feasibility of a reaction. If ΔG is negative, the process will be spontaneous and if  ΔG is positive, the process is non-spontaneous in the forward direction.

Gibbs free energy is the sum of enthalpy plus the product of temperature in Kelvin and entropy of the system.

Thus the correct option is C.

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Answer:

bleaching powder is actually a mixture of calcium chloride, calcium hydroxide and calcium hypochlorite. hence it is not a single salt. It is not completely soluble in water as it composed of heavy calcium salts, which are known to be insoluble in water.

Answer:

It does disolve

Explanation:

It depends on how much bleaching powder you're trying to dissolve in water

It would take approximately 133.3 s for the reaction to be 90.% complete.

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Answer: the way root cells reproduce to increase root length

Explanation:

Rudolf Ludwig Carl Virchowas known as the founder of social medicine and also the father of modern pathology.

Virchow posited that all cells are gotten from already existing cells and he used this in his work towards cellular pathology, as it was made clear that diseases takes place at the cellular level. He posited that the cells that are malfunctioning cause diseases.

Based on the above analysis, the image that Tumu would most likely use in his assignment to feature Rudolf Virchow is the way root cells reproduce to increase root length.

Answer:

the way root cells reproduce to increase root length

Explanation:

The more etchings there are in the graduated cylinder, the more precise it is, and the more accurate the liquid measure will be. We should choose the one with more etchings.

When working with liquids, we need to be precise, so we should choose a material that provides us with the necessary to make an accurate measure.

In the laboratory, elements like beakers or flasks should not be used to measure liquids. This is because they do not have a precise measuring scale.

These glasswares are prepared only to make crude measurings. These should not be used for accurately measuring out liquids.

However, there are several appropriate elements that can be used instead. Among them, we can mention graduated cylinders and pipets, volumetric pipets, or burets.

These graduated or volumetric elements have rules with many etchings that can be used to make more precise measurements.

The more etchings there are in the graduated cylinder, the more precise it is, and the more accurate the liquid measure will be.

Note: I do not have the image of the graduated cylinders A and B. But the chosen one should be cylinder with more etchings.

For better understanding, I will attach an image of two cylinders with markings in milliliters.

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