Four different liquid compounds in flasks at 20°c are represented above. The table below identifies the compounds. Flask c shows the most particles in the vapor phase. Which of the following is not shown in the model but best helps to explain why flask c must contain pentane?.

An object sliding on a surface eventually stops due to friction.

Friction is a force that opposes motion between two surfaces that are in contact with each other. When an object is sliding on a surface, there is friction between the object and the surface, which acts in the opposite direction to the motion of the object.

Friction is caused by the microscopic irregularities on the surfaces that are in contact with each other. As the object slides along the surface, these irregularities cause interlocking between the object and the surface, which resists the motion of the object.

As an object slides on a surface, the frictional force gradually slows it down until it comes to a stop. The amount of time it takes for an object to stop sliding depends on factors such as the initial speed of the object, the mass of the object, and the strength of the frictional force.

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Answer:

Ley.

Explanation:

En la teoría de la ciencia, la regularidad de los procesos en la naturaleza se denomina ley de la naturaleza. Las leyes naturales se diferencian de otras leyes en que los seres humanos no pueden ponerlas en vigor ni anularlas a su discreción. En tal sentido, la composición química del agua es indudablemente una ley natural, en tanto el hombre no puede modificarla sin modificar las características inherentes del agua como tal.

Answer: The combination of genes and environmental factors affects the growth of an organism.

Explanation:

Gene consists of DNA and it's heredity physical and functional unit. Genes play a vital role in a organisms growth. For example in humans, if one's parents are tall, there's a large tendency that such child will be tall and vice versa.

Environmental temperature also affects growth of living organisms. These include water soil pH, temperature, gender, chemicals etc. These all affects growth, it should be noted that proteins in living organisms can be damaged at a certain temperature which invariably affects the growth of such organism.

Also, the environment influences gene expressions as temperature, light, drugs, and chemicals, affects genes as they determine which ones will either be turned on or off which will further lead to how such organism grows.

cubic unit cell is the smallest repeated unit which have all angles equal to 90 and all have edge lengths equal

It is the type of the Unit cell which is having all angles equal to 90 and all sides equal to each other

it's is a unit cell with cubic structure

Answer:

Absorbed will be harder to spot than releasing because take this as it's like a tire. A tire will go smaller when it has no air compared to when it has air. But absorbed it the opposite. It gets bigger with more air and etc.

Explanation:

My answer don't copy and paste change it a little.

The number of moles in 58.3 g of copper (II) phosphate having a molecular formula  \(Cu_3(PO_4)_2\) is 0.15 mol.

Copper (II) Phosphate has the molecular formula of \(Cu_3(PO_4)_2\) and we can calculate the molecular formula by:

Molar mass = (Mass of copper) * 3 + ((Mass of phosphorus) + (Mass of Oxygen) * 4) * 2

= 63.5 * 3 + (31 + (16 * 4)) * 2

= 63.5 * 3 + (31 + 64) * 2

= 190.5 + 95 * 2

= 190.5 + 190

= 380.5 g

Moles are the amount of substance in a system that contains as many elementary entities as atoms in 12 g of Carbon.

Number of moles = \(\frac{m}{M}\)

where m is the given mass

M is the molar mass

Number of moles = \(\frac{58.3}{380.5}\) mol

= 0.15 mol

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Answer: Although the best-known cause of a mass extinction is the asteroid impact that killed off the non-avian dinosaurs, in fact, volcanic activity seems to have wreaked much more havoc on Earth's biota. Volcanic activity is implicated in at least four mass extinctions, while an asteroid is a suspect in just one. Examples, of mass extinctions are Permian extinction of marine species, and Cretaceous extinction of various species, including dinosaurs.

The correct answer is c. Both a and b. If water is not allowed to drip off the metal before it is placed in the calorimeter, the excess water will increase the mass of the metal, leading to an incorrect calculation of its specific heat capacity.

Additionally, the water clinging to the metal will have a different temperature than the metal itself, causing the initial temperature of the calorimeter water to be incorrect, which will further affect the calculation of the specific heat capacity of the metal. Therefore, it is important to ensure that the water is removed from the metal before it is placed in the calorimeter to obtain accurate results.

A calorimeter is a device used to measure the heat flow in a chemical or physical process. Calorimeters are used to determine the heat of reaction (ΔH) or the specific heat capacity of a substance (c). The most common type of calorimeter is the coffee cup calorimeter, which is a simple device consisting of a styrofoam cup with a lid and a thermometer inserted through the lid.

To use a calorimeter, the reactants are mixed inside the cup, and the heat released or absorbed by the reaction is measured by monitoring the change in temperature of the contents of the cup over time. By knowing the heat capacity of the calorimeter and the temperature change, the heat of reaction or specific heat capacity can be calculated using the equation:

q = CΔT

where q is the heat flow, C is the heat capacity of the calorimeter, and ΔT is the change in temperature.

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Answer:

Is there a picture if so I can't see it

Answer:

Third option.

Explanation:

when the balloon is rising to high altitudes, the air pressure decreases. so the helium in the balloon increases and expands the balloon.

hope this helps :)

The process of photosynthesis requires water and air in addition to grow ,obtain their energy from the sun  and supply oxygen to the environment .

It is defined as a process by which plants and other photosynthetic organisms convert the light energy in to chemical energy  through the process of cellular respiration.

Some of the energy which is converted  is stored in molecules of carbohydrates like sugar and starches  which are made up of from carbon dioxide and water . Photosynthetic organisms which can perform photosynthesis  are algae and cyanobacteria. Photosynthesis is largely responsible for producing and maintaining the content of oxygen in earth's atmosphere.

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Answer:

ide

Explanation:

the metal keeps its name in an ionic compound, the suffix of the nonmetal is changed to "ide" (ie sodium chloride, NaCl)

Answer:

0⁰c , 5 mmHg

Explanation:

Because at this temperature we all know water can be in state of both solid and liquid and when pressure is decreased it can be in form of gas too

If one strand of a DNA molecule has the sequence of bases 5'-ATTGCA-3', the other complementary strand would have the sequence 5'-TGCAAT-3'.

The complementary strand of DNA would have the sequence 5'-TGCAAT-3' if one strand of a DNA molecule has the sequence of bases 5'-ATTGCA-3'.There are a number of rules governing which bases pair with each other. In DNA, Adenine (A) pairs with Thymine (T), and Guanine (G) pairs with Cytosine (C).

Therefore, because A and T pair together and G and C pair together, the complementary strand can be found by simply switching out A for T and G for C or vice versa.

The base-pairing rules also imply that the 5' end of one strand is complementary to the 3' end of the other strand and vice versa. The correct complementary sequence to 5'-ATTGCA-3' would thus be 5'-TGCAAT-3'.

Therefore, option B) 5'-TGCAAT-3' is the right answer.

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Answer:

The parameter of an atom that defines its unique position in the periodic table is its atomic number, which is the number of protons in the nucleus of an atom.

The electron domain geometry is trigonal bipyramidal while the molecular geometry of the compound is seesaw.

The shapes of molecules is determined by the number of electron pairs on the valence shell of the central atom in the molecule. These electron domains include lone pairs and bond pairs.

The lone pairs only contribute towards the electron domain geometry and not the molecular geometry. SCl4 has five electron domains hence its electron domain geometry is trigonal bipyramidal. The molecular geometry of the compound is seesaw.

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Answer:

NaOH

Explanation:

Sodium hydroxide is the base in the acid-base reaction as all other acids and sodium chloride is salt and water is neutral.

According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.

Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.

They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.

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The molar mass of calcium phosphate, when rounded to the closest tenth, is 310.18 g/mol.

To calculate the molar mass of calcium phosphate (Ca3(PO4)2), we need to add the atomic masses of each of the atoms in one mole of the compound.

The atomic masses are:

Ca (calcium): 40.08 g/mol

P (phosphorus): 30.97 g/mol

O (oxygen): 16.00 g/mol

There are three calcium atoms and two phosphate groups in one mole of calcium phosphate. Therefore, the molar mass is:

(3 x 40.08 g/mol) + (2 x (2 x 30.97 g/mol + 8 x 16.00 g/mol))

= 120.24 g/mol + 2 x (61.94 g/mol + 128.00 g/mol)

= 310.18 g/mol

Rounding to the nearest hundredth gives a molar mass of calcium phosphate of 310.18 g/mol.

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Answer:

the trapping of the sun's warmth in a planet's lower atmosphere, due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet's surface.

Answer:

The warming of a planet due to trapped radiation.

When the density is measure , the correct is  c. the temperature should be specified.

The density is the ratio between the mass in the kg and the volume in the m³. The density of the graduated cylinder should be measure in the specified temperature. The expression for the density is expressed as follows :

The density = mass / volume

The density of the substance is measurement of the mass per unit the volume. The SI unit of the density is kg/m³, or we use g/cm³ for the solids, g/ml for the liquids, and the g/L for gases.

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This reaction, H2O(l) => H+(aq) + 2OH-(aq), best exemplifies the autoionization or self-ionization of water. The process by which an atom or molecule receives or loses an ion is known as ionization.

A positive or negative charge that results from chemistry. An atom or molecule that has an electrical charge is called an ionization. An anion is the name given to an ion that has a negative charge, and a cation is the name given to an ion that has a positive charge. An ion or group of ions with a positive charge and the innate propensity to travel toward the negative electrode during electrolysis are called cations. Metals are dissolved into their corresponding ions during a corrosion reaction.

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A LOAEL is defined as the lowest dose that demonstrates a significant increase in an observable adverse effect. The term LOAEL stands for "Lowest Observed Adverse Effect Level."

When testing chemicals and other substances for toxicity, the goal is to determine the concentration or dose at which adverse effects begin to appear. The LOAEL is the lowest dose at which an adverse effect is observed. This value can be used to establish a safe level of exposure to a substance.
To determine the LOAEL, a series of tests are conducted in which different doses of the substance being tested are administered to test animals. The animals are observed for any adverse effects, such as changes in behavior, weight loss, or organ damage. The lowest dose at which an adverse effect is observed is the LOAEL.
It is important to note that the LOAEL is a relative measure of toxicity. It only provides information on the dose at which an adverse effect is first observed and not on the severity of the effect. In addition, the LOAEL may vary depending on the species tested and other factors.
In summary, the LOAEL is the lowest dose at which an observable adverse effect is detected. This value is used to establish a safe level of exposure to a substance.

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An expression for the most probable speed of molecules of molar mass and temperature v² = 2kT/m.

Therefore, the most probable speed of molecules of molar mass and temperature t is given by vmp = (2kT/m)(1/2)

The most probable speed of molecules of molar mass and temperature t is determined by the Maxwell-Boltzmann distribution. The distribution is expressed by the following equation:

f(v) = 4π(v²) (m/2πkT)(3/2) exp(-mv²/2kT), where f(v) is the probability density function of the speed v, m is the molar mass of the gas, k is the Boltzmann constant, and T is the temperature.

To find the expression for the most probable speed, we differentiate f(v) with respect to v and set the result equal to zero:

df/dv = 8πv(m/2πkT)(3/2) exp(-mv²/2kT) - 4πv³(m/2πkT)(3/2) exp(-mv²/2kT) = 0.

Simplifying this expression, we get:v² = 2kT/m.

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The shielding effect of bromine is greater than chlorine because there are more filled orbitals than in chlorine.

This is the process where by electrons are protected by the pull attraction of the nucleus with the use of electron shells. The shielding effect increases down the group of the periodic table and increases across the period. This is because when you move down the group, there's an increase in the number of shell by 1 and it helps to reduce the effect of nuclear attraction on the electrons. However when you move across the period, there's an increase in the numbers of electron with the same shielding electrons from group 1(a) across the period to group 7(a).

Shielding effect is primarily dependent on the numbers of electrons in the inner shells as well as the type orbitals.

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When a wave moves through the air and comes into contact with an object, it hits its flat surface from a new angle, causing the wave to refract.

When waves cross the boundary between two different materials, their speed changes. For example, light waves refract when they pass through glass to air. Refraction is the effect that causes them to change direction as a result. When water waves move from deep water to shallow water (or the other way around), they refract light.

When waves bounce back from a surface they can't pass through, this is called reflection. When waves enter a new medium at an angle and begin traveling at a different speed, refraction occurs. Diffraction happens when waves spread out as they travel around impediments or through openings in obstructions.

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Taking into account the definition of percent yield, the percent yield of a reaction that had a theoretical yield of 3.76 g and an actual yield of 1.45 g. is 38.56%.

The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

percent yield= (actual yield÷ theoretical yield)×100%

where:

In this case, you know:

Replacing in the definition of percent yield:

percent yield= (1.45 grams÷ 3.76 grams)×100%

Solving:

percent yield= 38.56%

Finally, the percent yield is 38.56%.

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When the valve is opened, oxygen and hydrogen molecules will mix because of random movement of their molecules.

Diffusion involves the movement of gas molecules from one region where they are in higher concentration to another region where they are in lower concentration.

When the valve is opened, oxygen and hydrogen molecules will mix because of random movement of their molecules.

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Answer:

Oxygen and hydrogen molecules will mix because of random movement of their molecules.

Explanation:

Answer:

D

Explanation:

Glucose is produced through a process powered by sunlight that consumes Carbon Dioxide and produces oxygen as a waste product.  In order for glucose to be produced, Carbon dioxide (a compound) must be, in essence, converted into a completely different chemical: dioxygen.

Photosynthesis is biochemical process by which green plants produce energy and release oxygen. Glucose is produced in this reaction and thus it is a chemical change. Thus, option D is correct.

The change in a substance if involves any bond making or bond breaking then it is called a chemical change. Whereas, if the substance just changes from one phase or state to the other it is called a physical change.

All chemical reactions are chemical changes involving bond making or breaking or both. Photosynthesis is a biochemical reaction takes place in plant leaves with the aid of light energy.

Photosynthesis involves several stages where an electron transport chain, various oxidising and reducing agents are performing significant roles.

The net reaction in photosynthesis is the combination of water and carbon monoxide to form molecular oxygen and glucose. Therefore, there occurs bond making and breaking. Thus option D is correct.

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Answer: The answer is 457.9

Explanation: Realistically all you have to do is add both of the temperatures and then you can figure out the original heat. Since the heat drops 426.7 degrees and it comes to 31.2 degrees its 426.7 + 31.2 = 457.9.