a rigid cylinder with a movable piston contains a sample of gas. at 27 c, this sample has a pressure of 240. kilopascals and a volume of 70.0 milliliters. what is the volume of this sample when the temperature is changed to 150. k and the pressure is changed to 160. kilopascals?

Answer:

I would say c.

Explanation:

Answer:

Physical dependence is characterized by tolerance and withdrawal. Drug or substance dependency is psychological.

The reducing agent belongs in the left (oxidation) circle of the given Venn diagram.  Therefore, option (1) is correct.

A substance that loses its electrons to other substances in a redox reaction and gets oxidized to a higher valence state is known as a reducing agent.

A reducing agent can be described as one of the reactants of an oxidation-reduction reaction that can reduce the other reactant by donating its electrons to the reactant.

If the reducing agent does not give away its electrons to other substances in a reaction, then the reduction cannot occur. For example, in the following chemical reaction;

\(H_2(g) + F_2(g) \longrightarrow 2HF(g)\)

Hydrogen gas acts as a reducing agent because it gives out its electrons to fluorine, which permits fluorine to be reduced.

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Answer:

发你如果热客人看看如果

Explanation:

Answer:

result = 310

significant figures =  2

Explanation:

How to round significant figures:

look the first non-zero digit if rounding to one significant figure, look the digit after the first non-zero digit if rounding to two significant figures. draw a vertical line after the place value digit that is required.look at the next digit.

result = 310

significant figures = 2

CD4 and CD8 T-cell numbers are decreased after blunt trauma.

A body damage brought on by a strong collision with a dull item or surface is known as blunt trauma, also known as non-penetrating trauma or blunt force trauma. It differs from penetrating trauma, which occurs when an object or surface pierces the body and leaves an open wound. To stabilize and care for the patient, trauma hospitals need to use a coordinated, multidisciplinary approach. For instance, a Level I trauma center has well-established treatment protocols in place and specific sorts of healthcare specialists on call around-the-clock, seven days a week.

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Beans are processed through 'nibbing'. During the nibbing process, the roasted cocoa beans are crushed and ground into a paste called cocoa mass or cocoa liquor.

This cocoa mass can then be further processed to separate the cocoa solids from the cocoa butter, which is the fat component of the cocoa bean. The separated cocoa solids and cocoa butter are used in the production of chocolate. Pure cocoa mass (cocoa paste) in solid or semi-solid form is known as chocolate liquor. It includes about equal amounts of cocoa butter and solid cocoa, much like the cocoa beans (nibs) from which it is made. It is made from fermented, dried, roasted, and separated from their skins cocoa beans. To make cocoa mass (cocoa paste), the beans are pulverised.

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The inventor of carbonated water, Joseph Priestley, also discovered several elements during his scientific career.

Priestley, an English chemist and natural philosopher, made significant contributions to the field of chemistry in the 18th century.

One of his notable discoveries was oxygen. In 1774, Priestley conducted experiments in which he isolated a gas that could support combustion and enhance the respiration of animals.

He named this gas "dephlogisticated air," which is now recognized as oxygen.

In addition to oxygen, Priestley also discovered other gases, including nitrous oxide (laughing gas), carbon monoxide, ammonia, sulfur dioxide, and hydrogen chloride.

His experiments and investigations into these gases helped expand the understanding of chemical elements and their properties.

Priestley's discoveries paved the way for advancements in chemistry and laid the foundation for later studies in the field.

His work not only revolutionized scientific knowledge but also had a profound impact on various industries and applications, including the development of carbonated water, which has become a popular beverage worldwide.

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Answer:

1) atomos. 2) uncuttable.

Explanation:

none

Approximately 222.4 grams of oxygen reacted in the combustion process. To determine the amount of oxygen that reacted, we can use the balanced chemical equation for the combustion of hydrogen:

2H₂ + O₂ → 2H₂O

From the equation, we can see that 1 mole of oxygen reacts with 2 moles of hydrogen to produce 2 moles of water.

First, we need to convert the given masses of hydrogen and water into moles using their molar masses:

Molar mass of hydrogen (H₂) = 2 g/mol

Molar mass of water (H₂O) = 18 g/mol

Mass of hydrogen in moles = 27.8 g / 2 g/mol = 13.9 mol

Mass of water in moles = 249 g / 18 g/mol = 13.8 mol

Since the stoichiometry of the reaction tells us that 2 moles of hydrogen react with 1 mole of oxygen, we can calculate the moles of oxygen consumed as:

Moles of oxygen consumed = 13.9 mol / 2 = 6.95 mol

Finally, we can convert the moles of oxygen to grams using its molar mass:

Molar mass of oxygen (O₂) = 32 g/mol

Mass of oxygen consumed = 6.95 mol × 32 g/mol = 222.4 g

Therefore, approximately 222.4 grams of oxygen reacted in the combustion process.

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All three statements are generally true about the salt bridge I.cations travel to the cathode and anions travel to the anode. ii. electrons travel through the salt bridge from the cathode to the anode. iii. the salt bridge used in this lab will have k and no3- ions.

i. Cations, which are positively charged ions, travel to the cathode (the negatively charged electrode), and anions, which are negatively charged ions, travel to the anode (the positively charged electrode), through the salt bridge. This is necessary to maintain electrical neutrality in the half-cells.

ii. Electrons do not travel through the salt bridge; they flow through an external circuit connecting the two half-cells. The salt bridge allows the flow of ions, which balances the charge buildup in the half-cells, and completes the circuit.

iii. The salt bridge used in the lab can contain any combination of cations and anions, depending on the specific electrolyte being used. However, K+ and NO3- are commonly used as they are highly soluble and have low reactivity.

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Answer: Decomposition

Explanation:

Decomposition reactions involve a substance breaking down into simpler substances.

Let's see that the STP represents the conditions for the temperature of 0°C (273 K) and for the pressure of 1 atm.

We have this initial data and a volume of 3.20 x 10 ^(2) mL. To solve this problem, we need to use the ideal gas formula:

where T is temperature, P is pressure, and V volume. Subindex 1 is the initial data and subindex 2 is the final data.

We want to find the final volume, so clearing for V2 in the formula, we're going to obtain:

And the final step is replacing the data that we have, where the final data is 425.0 K and 3.50 atm (remember that the volume must be in liters, 1 liter is 1000 mL, so 3.20 x 10^2 mL is 0.32 L):

The answer is that the new volume of the sample of helium would be 0.14 L.

Answer: Burning fuels?

Explanation: I’m not very sure actually

a. The precipitate formed for Pb2+ is PbCl2.

b. Adding excess chloride in the first step of the schema can lead to the formation of additional insoluble compounds.

c. The precipitate formed for Ba2+ is BaSO4.

d. A solution of HCl can be used in the above scheme rather than aqueous NaCl.

a. Pb2+ ions react with chloride ions (Cl-) to form a white precipitate of PbCl2 as shown by the chemical equation:

\(Pb^{2+} + 2Cl^{-} \rightarrow PbCl_{2(s)}\)

c. Ba2+ ions react with sulfate ions (SO4^2-) to form a white precipitate of BaSO4 as shown by the chemical equation:

\(Ba^{2+} + SO_{4}^{2-} \rightarrow BaSO_{4(s)}\)

b. Adding excess chloride in the first step of the schema can lead to the formation of additional insoluble compounds. For example, excess chloride ions can react with Ag+ ions (from the addition of AgNO3) to form a white precipitate of AgCl, which can interfere with the identification of other ions in the solution.

d. A solution of HCl can be used in the above scheme rather than aqueous NaCl. Both HCl and NaCl provide chloride ions that react with Pb2+ to form PbCl2.

However, HCl is a stronger acid than NaCl and can potentially react with other ions in the solution, which may affect the results of the qualitative analysis. Additionally, the use of HCl may require adjustments to the procedure to ensure that the pH of the solution remains in the appropriate range.

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Answer:

The Moon orbits the Earth which orbits the Sun.

Explanation:

Product prediction and solubility rules in the following chemical reactions

MgBr2 (aq) + Cl2 (g) → MgCl2 (aq) + Br2 (aq)

Reaction type: Substitution

2 Al (s) + Fe2O3 (s) → Al2O3 (s) + 2 Fe (s)

Reaction type: Redox

ZnCl2 + 2 AgNO3 → Zn(NO3)2 + 2 AgCl

Reaction type: Double substitution

H2SO4 (aq) + 2 NaOH (aq) → Na2SO4 (aq) + 2 H2O (l)

Reaction type: Neutralization

4 Al (s) + 3 O2 (g) → 2 Al2O3 (s)

Reaction type: Oxidation

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Explanation:

On the periodic table, we can find a wide range of elements from alkali metals, to the alkali earth metals, transition metals and through to the noble gases.

The alkali metals are found on the first group in the periodic table and they are group of metals. Also, the transition elements are also a group of metals.

Option A "store all solutions in brown bottles" is NOT required to ensure that stock solutions are free of contamination.

A stock solution is a high concentration solution that is created to be diluted for a variety of laboratory activities. For example, if an experimenter wants to prepare 1 L of 0.1 mol/L hydrochloric acid (HCl), they will prepare 83.33 mL of concentrated HCl (12 mol/L) and then add it to 916.67 mL of water to make up the final volume.Steps to ensure stock solutions are free of contamination:One should always use the following steps to ensure that stock solutions are free of contamination:Never return excess chemicals to stock bottles.Do not place dropping pipettes in stock solution bottles.Only replace tops on reagent bottles after use.Store solutions in a cool, dry place. Avoid sunlight. Store all solutions in brown bottles.Keep all solutions labelled to avoid mixing them up.Examine your glassware for cleanliness before using it.Pipette liquids with care.

Avoid spilling on the ground. Avoid placing pipette tips on the table.Never use pipette tips or glassware that have been used to mix or carry other substances.Never attempt to taste or smell any chemicals or solutions.Wear protective gloves and lab coats when dealing with dangerous substances.

Stock solutions should always be checked for contamination before they are used. If contamination is suspected, the solution should be discarded.

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Answer:

a pure substance

Explanation:

i hope i help if i didnt im srry:(

Answer:

O A. The total kinetic energy of the particles of matter

Explanation:

I got it right on assignment. (°ω°)

Answer:

Gravity

Explanation:

If a forensic scientist uses a reagent to release carbon monoxide from a blood sample, the next step they should take is to use gas chromatography to measure the carbon monoxide. The correct option is B.

Gas chromatography is a technique commonly used to separate and analyze the components of a gas mixture. In this case, it can be used to detect and quantify the amount of carbon monoxide released from the blood sample.

Gas chromatography works by separating the components of a gas mixture based on their different affinities for the stationary phase and mobile phase.

The carbon monoxide released from the blood sample can be injected into the gas chromatograph, where it will travel through a column and be separated from other gases present in the mixture.

By measuring the retention time and peak area of the carbon monoxide peak, the forensic scientist can determine the concentration of carbon monoxide in the blood sample.

Performing a color test, using a spectrophotometer, or using ultraviolet light would not be suitable methods for specifically measuring the amount of carbon monoxide released. Gas chromatography provides a more precise and quantitative analysis for this purpose. The correct option is B.

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Answer:

for the second one i'd go with reflection

Explanation:

Explanation:

The atoms on the periodic table are grouped according to having similar properties. Therefore, atoms of group 15 has 5 valence electrons.

Answer:

The last option is correct.

Answer: 32 atomic mass units

Explanation:

carbon is 14

hydrogen is 1 each

oxygen is 16

The crop evapotranspiration for cabbage and maize are 6.3 mm/day and 7.2 mm/day respectively.

a) Actual evapotranspiration is less than potential evapotranspiration (PET) due to the following reasons:i) When the soil surface is dry, it causes the reduction of the evapotranspiration rate.ii) Lack of enough water within the soil profile affects the rate of water movement from the soil surface to the atmosphere.

iii) Limited soil water supply within the soil profile reduces the rate of evapotranspiration. b) Transpiration refers to the process through which water is absorbed by plants, moves through the plants and then evaporates into the atmosphere. One of the methods used to measure transpiration is potometer. This is done by:Inserting a leafy shoot into a capillary tube that is filled with water and ensuring that it is airtight Allowing the plant to transpire for a given period of time, then noting the distance moved by the air bubble on the capillary tube Dividing the distance moved by the time taken to get the rate of water uptake by the plant.

c) For Cabbage;Crop evapotranspiration (E) = ETO x Kc Crop evapotranspiration

(E) = 6.0 mm/day x 1.05

= 6.3 mm/dayFor Maize;

Crop evapotranspiration (E) = ETO x KcCrop evapotranspiration (E)

= 6.0 mm/day x 1.20

= 7.2 mm/day

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Answer:

first identify the cation and write down its symbol and charge. Then, identify the anion and write down its symbol and charge.

Explanation:

In order to produce fire fighting foam, three items must be educated or injected in correct ratios that is Foam concentrate, water, and air.

A stable mass of tiny air-filled bubbles with a lower density than oil, gasoline, or water is what makes up a fire fighting foam. Water, foam concentration, and air are the three components that make foam. These three components combine to create a uniform foam blanket in the right ratios.

Fire suppressants like aqueous film forming foam (AFFF) are used to put out flammable liquid fires like fuel fires.

While non-AR foams, such as regular aqueous film-forming foam (AFFF) or protein-based foam, only function with non-polar solvents, alcohol resistant (AR) foams can be used with both polar (alcohol) and non-polar (hydrocarbon) solvents. Water makes up most of a foam blanket.

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The complete question ''In order to produce fire fighting foam, what three items must be educted or injected in correct ratios?

a. Foam concentrate, water, and air

b. Polar solvents, foam concentrate, and water

c. Hydrocarbons, foam solution, and air

d. Foam solutions, gelling agent, and water

Atoms exchange or share electrons during bonding to obtain stability by completing their valence shells and also to achieve a lower energy state.

Atoms exchange or share electrons during bonding because of the force of attraction between two oppositely charged ions or particles called the electrostatic force. This force of attraction results in the formation of a bond, holding two atoms together within a compound.

The electrons are either shared or exchanged because they determine the chemical reactivity of an atom and are responsible for forming bonds between atoms. Atoms bond with each other to complete their outer shells and obtain stability, which is usually achieved by acquiring eight electrons in their valence shells. This is known as the octet rule.

The main types of chemical bonds that atoms form include covalent bonds and ionic bonds. Covalent bonds involve the sharing of electrons between atoms, while ionic bonds involve the transfer of electrons from one atom to another. Ionic bonding occurs between atoms that have a large difference in electronegativity, whereas covalent bonding occurs between atoms with a small difference in electronegativity.

In conclusion, atoms exchange or share electrons during bonding to obtain stability by completing their valence shells and also to achieve a lower energy state.

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