Make sure T is in Kelvin! If it is in °C then use K = C +273

Example 1: If a 2.0 L sample of air is collected at 298K, but its temperature falls to -25°C, what is the final

volume of the sample?

Answer:

An example of bent molecular geometry that results from tetrahedral electron pair geometry is H2O. The water molecule is so common that it is wise to just memorize that water is a BENT molecule.

Pressure has little effect on the solubility of liquids and solids because they are almost incompressible. This statement is True. Solid solubility hardly gets affected by changes in pressure.

A substance's physical and chemical characteristics affect how soluble it is. A few other factors and circumstances can also influence it. A few of them are: temperature, pressure, type of binding, and forces between the particles.

Pressure has a significantly greater impact on gases than it does on solids and liquids. The likelihood of a gas's solubility also increases as its partial pressure rises. One instance of how CO2 is stored under high pressure is in a soda bottle.

In like, like dissolves.

Each molecule has a unique set of intermolecular forces and connections. The likelihood of solubility between two dissimilar compounds is less likely than that between like substances. For instance, ethanol is highly soluble in water, a polar solvent, whereas water is not.

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Explanation:

\(element \: with \: 2 \: atomic \: number \\ \\ is \: stable \: because \: it \: has \: already \: \\ \\ completed \: its \: orbit \: \\ \\ but \: atomic \: number \: with \: 3 \: and \: 9 \\ \\ will \: have \: to \: become \: stable \: \\ \\ after \: giving \: one \: electron \\ \\ so \: \: element \: with \: 3 \: and \: 9 \: atomic \: number \\ \\ is \: most \: reactive\)

Answer:

when light travels into the water from the air, it slows down (because water is a more dense substance) which causes it to change direction and makes it seem to bend. this is called refraction. mediums that are more dense have a higher refraction index. for example, air has a ri of 1, but water is about 1.33.

The mass in grams of sucrose that should be burned to raise the temperature of the calorimeter and its contents from 23.0°C to 50.0°C is 3753.5 grams.

The total heat absorbed by the calorimeter and its contents is calculated as follows:

Heat absorbed by the water = m*c*Δt

where;

m is mass = 0.600 kg or 600 g

c is the specific heat of water = 4.184 J/g°C

Δt is the temperature change = (50 - 23)°C or 27°C

Heat absorbed by the water  = 600 g * 4.184 * 27

Heat absorbed by the water = 67.78 kJ

Heat absorbed by the calorimeter = c * Δt

where;

c is the heat capacity of the empty calorimeter = 1.23kJ/°C

Δt is the temperature change = (50 - 23)°C or 27°C

Heat absorbed by the calorimeter = 1.23 * 27

Heat absorbed by the calorimeter = 33.21 kJ

Total heat absorbed by the calorimeter and contents = 33.21 kJ +  67.78 kJ

Total heat absorbed by the calorimeter and contents = 100.99 kJ

1 mole of sucrose evolves 5.65 kJ of heat

Moles of sucrose required = 100.99/5.65

Moles of sucrose required = 17.874 moles

Mass of sucrose required = 17.874 moles * 210 g/mol

Mass of sucrose required = 3753.5 grams

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The ability of an atom in a covalent bond to attract shared electrons to itself is best quantified by its electronegativity value.

Electronegativity is a measure of the tendency of an atom to attract electrons to itself when it forms a chemical bond with another atom. The electronegativity values of atoms are typically determined experimentally and are assigned on a scale known as the Pauling scale. The higher the electronegativity value of an atom, the more strongly it attracts shared electrons towards itself. Electronegativity values can be used to predict the polarity of a covalent bond and the distribution of electrons in a molecule.

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Answer: It is usually separated from tea leaves by filtration. B Because the composition of the solution is uniform throughout, it is a homogeneous mixture. A Orange juice contains particles of solid (pulp) as well as liquid; it is not chemically pure.

Answer:

Every element has a proton, neutron, and electron. The number of protons is equal to the atomic number, and the number of electrons is equal to the protons unless it is an ion.

Answer:

Every element has a proton, neutron, and electron. The number of protons is equal to the atomic number, and the number of electrons is equal to the protons unless it is an ion.

Explanation:

Answer:

-Molarity is defined as moles of solute divided by liters of solution and has units of mol/L. To get this answer, you just divide the number of moles by the volume in liters: 2.5 mol/195L = 0.013 M. I think

Explanation:

Answer: 0.28125

Explanation:

Assuming our planet to be a perfect sphere, then the average density of the Earth is approximately 5.514 g/cm^3.

The average density of the Earth can be calculated as follows:

The volume of a sphere can be calculated using the formula:

V = (4/3) * π * r^3

Where r is the radius of the sphere. The radius of the Earth is approximately 6,371 km.

The mass of the Earth is known to be approximately 5.97 x 10^24 kg.

So, the average density of the Earth can be calculated as follows:

density = mass / volume

density = 5.97 x 10^24 kg / [(4/3) * π * (6,371 x 10^3 m)^3]

density = 5.97 x 10^24 kg / (1.08 x 10^21 m^3)

density = 5514 kg/m^3

To convert from kilograms per cubic meter to grams per cubic centimeter, we multiply by 1000:

density = 5514 kg/m^3 * 1000 g/kg = 5.514 x 10^6 g/m^3 = 5.514 g/cm^3

So, the average density of the Earth is approximately 5.514 g/cm^3.

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The color of the flame emitted by known compounds can be used to help identify the metallic ion present in an unknown solid. Different metallic ions produce different flame colors when they come into contact with a flame.

Metal ions in unknown substances can be identified through flame tests thanks to their distinctive emission spectra.

The metallic ion contained in an unknown material can be determined using the color of the flame produced by known compounds.

When in contact with a flame, different metal ions produce distinct flame colors: sodium creates a yellow flame, whereas potassium creates a violet flame.

The presence of a metallic ion can be determined by contrasting the flame colors of the known compounds with the flame of the unknown solid.

A spectroscope must be used to evaluate the flame in order to precisely identify the metal ions contained in an unidentified substance. This can lead to a more precise identification and a more thorough investigation of the emission spectra.

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Answer:

what do you mean?

Explanation:

Answer:

All waves of the electromagnetic spectrum have a speed of 3 × 10⁸ ms⁻¹

KI: This is an ionic compound made of the nonmetal iodine and the metal potassium (K) (I). Phosphorus (P) and oxygen (O) combine to generate the chemical compound P2O5 (O).

White, microcrystalline, light-weight phosphorus pentoxide is created when elemental phosphorus burns in an atmosphere with too much oxygen. The anhydride of orthophosphoric acid, H3PO4, is phosphorus pentoxide.

A molecular molecule typically consists of two or more nonmetal parts. Molecular compounds are termed using the stem of the first element's name plus the suffix -ide, followed by the second element. The number of atoms in a molecule is specified using numerical prefixes.

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A calcium supplement contains 570 mg of the calcium per tablet. The equality for this statement is 610 mg of the calcium = 1 tablet .

The Amount of the calcium present in the calcium supplement is 610 mg per tablet . The Equality statement are obtained is expressed as follows: 610mg of the calcium = 1 tablet

Our  body needs calcium to be build and to maintain the strong bones. Our heart, muscles and the nerves also need the calcium to function it properly. When our body calcium intake is insufficient, and our body will remove the calcium from the bones, and making them weak and the brittle.

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Molten cryolite is the substance which serves as an electrolyte in the diagram.

This is defined as a substance that conducts electricity when dissolved in water.

Molten cryolite serves as the electrolyte as it helps dissolve molten aluminium oxide and increases the conductivity of the solution which was why it was chosen as the most appropriate choice.

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Answer: Molten cryolite

Explanation: Molten cryolite serves as the electrolyte as it helps dissolve molten aluminium oxide and increases the conductivity of the solution which was why it was chosen as the most appropriate choice.

The description provided in the question is for crude oil, which is a thick, viscous liquid mixture of thousands of compounds, most of them hydrocarbons.

Crude oil is a fossil fuel that is formed over millions of years from the decomposition of marine plants and animals.

It is primarily composed of alkanes, but also contains other compounds such as sulfur, nitrogen, and oxygen-containing compounds.

Crude oil is an important source of energy and is used to produce a variety of products such as gasoline, diesel fuel, and jet fuel, as well as plastics, chemicals, and other industrial products.

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The solve this problem, we need to use the ideal gas law equation PV = north. Since we are dealing with the same temperature and pressure for both gases, we can set up a ratio using the number of moles of each gas, which is proportional to their respective masses.

The First, we need to calculate the number of moles of helium using its mass and molar mass n(He) = 12.0 g / 4.00 g/mol = 3.00 mol Next, we can use the same equation to solve for the volume of the helium PV = north V(He) = n(He)RT / P V(He) = (3.00 mol) (0.0821 Latam/Molk)(T) / (P) We don't know the exact temperature or pressure, but we can assume that they are constant for both gases. Therefore, we can eliminate them from the equation and use the ratio of the number of moles. V(Ne) / V(He) = n(Ne) / n(He) n(Ne) = 24.0 g / 20.18 g/mol = 1.19 mol V(Ne) / 14.3 L = 1.19 mol / 3.00 mol V(Ne) = (1.19 mol) (14.3 L) / 3.00 mol V(Ne) = 5.67 L Therefore, the volume that a 24.0-g sample of neon gas would occupy at the same temperature and pressure as the 12.0-g sample of helium gas is 5.67 L. Answer 5.67 L

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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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Two atoms that are isotopes of one another must have a different number of Neutrons. Except for basic hydrogen, every atom's nucleus contains a neutron, a subatomic particle.

Isotopes are atoms of the same element with the same number of protons, meaning that their atomic number does not change, but differing quantities of neutrons. They are found to have identical chemical properties because of their identical electrical configuration, yet they have different physical properties.

The name of the particle comes from the fact that it is electrically neutral and devoid of charge. The densest particles are neutrons.

Isotopes are members of the same family of elements as that element but have varying numbers of neutrons. The Periodic Table's atomic number of an element is determined by the number of protons it contains.

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Explanation:

acid ,HNO3

base,KOH

salt ,KNO3

Explanation:

here's the answer to your question

Answer:

Formula Weight of gas sample = 20.1 g/mole => Neon (Ne)

Explanation:

Use Ideal Gas Law formula to determine formula weight and compare to formula weights of answer choices.

PV = nRT = (mass/fwt)RT => fwt = (mass/Volume)RT = Density x R x T

Density = 0.900 grams/L

R = 0.08206 L·atm/mole·K

T = 0.00°C = 273Kfwt = (0.900g/L)(0.08206L·atm/mole·K )(273K)

= 20.1 g/mol => Neon (Ne)

Answer:

yolo go with C

Explanation:

The optimum pH range for blood is approximately 7.35 to 7.45. Deviations from this range can have serious consequences on physiological processes. The body employs three mechanisms to control pH: buffers, respiratory regulation, and renal regulation. Blood plays a crucial role in maintaining pH homeostasis by utilizing these mechanisms.

The optimum pH range for blood is tightly regulated between 7.35 and 7.45. If the blood pH deviates from this range, it can disrupt normal physiological processes. For example, if the blood becomes too acidic (pH below 7.35), a condition called acidosis occurs.

Acidosis can lead to impaired enzyme function, decreased oxygen delivery to tissues, and disruption of the central nervous system. On the other hand, if the blood becomes too alkaline (pH above 7.45), a condition called alkalosis occurs. Alkalosis can result in muscle twitching, confusion, and even seizures.

To maintain the pH within the optimal range, the body employs three primary mechanisms: buffers, respiratory regulation, and renal regulation. Buffers are chemical substances that can accept or donate hydrogen ions to resist changes in pH. They can bind excess hydrogen ions when blood becomes acidic or release hydrogen ions when blood becomes alkaline.

The respiratory system regulates pH by adjusting the levels of carbon dioxide (\(CO_{2}\)) in the blood through changes in breathing rate and depth. By altering the amount of \(CO_{2}\), the body can regulate the concentration of carbonic acid (\(H_{2}\)\(CO_{3}\)) and thus control pH. The kidneys play a crucial role in long-term pH regulation by selectively reabsorbing or excreting bicarbonate ions (\(HCO_{3}\)-) and hydrogen ions (H+) in the urine.

Hence, the optimum pH range for blood is approximately 7.35 to 7.45. Deviations from this range can lead to acidosis or alkalosis, disrupting physiological processes. The body controls pH through buffers, respiratory regulation, and renal regulation. Buffers resist pH changes, the respiratory system regulates \(CO_{2}\) levels to control carbonic acid concentration, and the kidneys selectively reabsorb or excrete bicarbonate and hydrogen ions to maintain pH homeostasis.

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1) To react with 0.460 mole of SO₂, 1.15 moles of C are needed.

2) When 2.0 moles of C reacts, 1.6 moles of CO are produced.

3) To produce 0.35 mole of CS₂, 0.70 moles of SO₂ are required.

4) When 2.4 moles of C reacts, 0.48 moles of CS₂ are produced.

1.

From the balanced equation, the stoichiometric ratio between C and SO₂ is 5:2. Therefore, to calculate the moles of C required, we can set up a proportion:

(5 moles C / 2 moles SO₂) = (x moles C / 0.460 moles SO₂)

Solving for x, we find:

x = (5/2) × 0.460 = 1.15 moles C

2.

From the balanced equation, the stoichiometric ratio between C and CO is 5:4. Therefore, to calculate the moles of CO produced, we can set up a proportion:

(5 moles C / 4 moles CO) = (2.0 moles C / x moles CO)

Solving for x, we find:

x = (4/5) × 2.0 = 1.6 moles CO

3.

From the balanced equation, the stoichiometric ratio between SO₂ and CS₂ is 2:1. Therefore, to calculate the moles of SO₂ required, we can set up a proportion:

(2 moles SO₂ / 1 mole CS₂) = (x moles SO₂ / 0.35 moles CS₂)

Solving for x, we find:

x = (2/1) × 0.35 = 0.70 moles SO₂

4.

From the balanced equation, the stoichiometric ratio between C and CS₂ is 5:1. Therefore, to calculate the moles of CS₂ produced, we can set up a proportion:

(5 moles C / 1 mole CS₂) = (2.4 moles C / x moles CS₂)

Solving for x, we find:

x = (1/5) × 2.4 = 0.48 moles CS₂

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Answer:

Explanation:

The volume of distilled water that should be added to 25 cm3 of 0.125 moldm-3 HCl in order to dilute it 10 times can be calculated using the following equation:

Volume of added water = (25 cm3 x 10) / (0.125 moldm-3)

= 200 cm3

Therefore, the volume of distilled water that should be added to 25 cm3 of 0.125 moldm-3 HCl in order to dilute it 10 times is 200 cm3.

Answer:

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Answer:

.025 moles

Explanation:

Be Cl2   is beryllium chloride

Be = 9.0121 gm/mole

Cl = 35.45 gm mole

   Be Cl2 = 79.91 gm/mole

2 gm / 79.91 gm/mole = .025 moles

The unknown metal X is iron metal as it reacts with copper sulfate solution but does not react with magnesium chloride.

Some metals are very reactive while other metals are less reactive or unreactive. When a more reactive metal is added to the solution of a less reactive metal, then the more reactive displaces the less reactive metal from its solution is known as a displacement reaction.

The general form of a single displacement reaction can be represented as:

\(A + BC \longrightarrow B + AC\)

When iron is placed in copper sulfate (CuSO₄) solution then the blue color of the copper sulfate solution turns a red-brown coating of copper metal deposited on the iron.

\(CuSO_4 (aq)+ Fe (s)\longrightarrow FeSO_4 (aq) +Cu(s)\)

Iron lies above the electrochemical series and is more reactive than copper. So it reacts with copper sulfate but does not give any reaction with magnesium chloride.

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Answer:

A 2000 kg car accelerate at a rate of 0.5 m/s2. What is the net force acting on the car in Newtons? (Numeric Answers only)

Chemical Reactions  Involving rearrangements (sharing, donating, or accepting) of valence electrons  The element undergoing a chemical reaction does not change  Nuclear Reactions Involve nucleus.

(not electrons) Often results in change in elements (since element is defined by number of protons) isotopes have same number of protons and a different number of neutrons  Fusion (adding two nuclei together)  Fission (breaking apart)  Radioactive decay  At high temperatures nuclear fusion can occur At very high temperatures, some electrons on atoms are stripped away (they have so much energy that they can overcome the attraction to the nucleus) ­ forming a plasma ­ fusion occurs in stars Plasma is the 4th fundamental state of matter and is most abundant form of matter in the universe  If there is enough kinetic energy in the system, the nuclei can get closer; at that point the strong nuclear force comes into play  Strong nuclear force is strongest and hold nucleus together; acts at only extremely short distances, 10 m  If nuclei can get close enough, the strong nuclear force can come into play (distances of about a nucleon) ­ attractive force; requires great deal of energy  PE curve vs. distance curve for 2 nuclei approaching Lect

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