ans fast plss i have due in 2 hours

Answer:

A: Because her drawing does not accurately represent what really happens, she should make a new version of it that better predicts what she actually experienced in the dark room.

A sample of titanium-45 will degrade from 65 grams to 25 grams in 4.24 hours.

The formula for the half-life of a first-order reaction is = 0.693/k.

Half-life is 3.08 hours, given.

So k = 0.225

First order reaction rate is calculated using:

where k is the reaction rate and 0.225 is the reaction time

R' = 25g, the total quantity.

original quantity = 65g

With these parameters entered, we obtain t=4.24 hours.

As a result, a sample of titanium-45 will degrade from 65.0 grams to 25.0 grams in 4.24 hours.

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6l volume of methane gas, ch4, has the same number of atoms as 6.00 l of krypton gas at the same temperature and pressure.

The Avogadro's law can be used to connect the volume of the gas to its number of moles. This law asserts that at the same temperature and pressure, gases with the same molar amount will occupy the same volume. The number of atoms in the two gases must be equal if the number of moles is the same. Accordingly, if Kr and methane both have the same number of particles, their respective volumes would be the same.

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Answer:

what are the gas samples

At the end of the diffusion process, the concentration of substances on each side is. equal. This is because the diffusion process causes the substances to move from areas of high concentration to areas of low concentration until they are evenly distributed.

What is concentration?
Concentration in chemistry is calculated by dividing a constituent's abundance by the mixture's total volume. Mass concentration, molarity, number concentration, as well as volume concentration are four different categories of mathematical description. Any type of chemical mixture can be referred to by the term "concentration," but solutes as well as solvents in solutions are most frequently mentioned. There are different types of molar (amount) concentration, including normal concentration as well as osmotic concentration. The word "concentration" is derived from the French verb "concentrer," which means "to put at the centre" and comes from the root con-.

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The mass of the zinc in the dollar coin is about 0.486 grams, the mass of the manganese is about 0.285 grams, the mass of the nickel is about 0.162 grams, and the mass of the copper is about 7.135 grams.

What is an alloy?

An alloy is the mixture of two or more elements, at least one of which is a metal. Alloys are typically created to improve upon the properties of the individual metals, such as increasing strength or corrosion resistance. They are used in a wide range of applications, including in the construction of buildings, vehicles, and electronic devices. The specific properties of an alloy depend on the metals that it is made of and the proportion of each metal in the mixture.

According to the problem:

The mass of each metal in the dollar coin has some specific percentage.

Multiply the percentage composition of the metal by the total mass of the coin to determine the mass percentage for each metal:

Zinc: [tex]6.0\% \times 8.1 grams = \frac{6.0}{100} \times 8.1=0.486 grams[/tex]

Manganese: [tex]3.5\% \times 8.1 grams = \frac{3.5}{100} \times 8.1=0.285 grams[/tex]

Nickel: [tex]2.0\% \times 8.1 grams = \frac{2.0}{100} \times 8.1=0.162 grams[/tex]

Copper:

[tex](100\% - 6.0\% - 3.5\% - 2.0\%) \times 8.1 grams = 88.5\% \times 8.1 grams = \frac{88.5}{100} \times 8.1=0.486 grams[/tex]

So the mass of the zinc in the dollar coin is about 0.486 grams, the mass of the manganese is about 0.285 grams, the mass of the nickel is about 0.162 grams, and the mass of the copper is about 7.135 grams.

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Answer:

Thus, the second principal energy level can hold up to eight electrons, two in the s orbital and six in the p orbital. The third principal energy level has one s orbital, three p orbitals, and five d orbitals, which can each hold up to 10 electrons. This allows for a maximum of 18 electrons.

Vessel B has more mass. Explanation: Because temperature and average kinetic energy of molecules are directly proportional to each other.

The average kinetic energy of a substance's particles is directly inversely correlated with its temperature. As the temperature increases, the particles must travel more quickly because their mass remains constant.

The relationship between a gas particle's average kinetic energy and temperature is linear. The pace at which the gas molecules flow rises with temperature. At a specific temperature, the average kinetic energy of all gases is identical.

Molecules of gas move more quickly when they are lighter. Because of this, as the gas's temperature rises, its volume also does so. The more gas particles there are, the more likely it is that they will hit the container's walls, hence the frequency of collisions must rise.

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Answer: Radiation (obtained by nuclear reactions) is used in medicine, academics, industry, and  electricity.  In addition to that, radiation has been useful in areas such as agriculture, archaeology, space exploration, law enforcement, geology, and many others.

The radiation emitted from nuclear reactions are used in various fields such as medical field, agriculture, research fields etc.

Unstable radioactive elements undergo emission of charged particles such as alpha or beta and produce  their isotopes or new elements. This reactions involving the change to atomic nuclei by reducing the number of protons or neutrons is called nuclear reactions.

The radiation emitted from nuclear reaction is very useful in many fields, especially in medical fields. Many diagnostic techniques are based on radiation.  Similarly radiation is used in cancer treatments.

Suitable radiations are used in agricultural field for pest control. There is a branch itself  in science to study the various utilities of radiations and there are tremendous experiments and researches are conducted based on suitable radiations.

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66.7 mL of Ethanol was dissolved in 222.2 mL of water. the volume % of the ethanol in the solution is 30.0 %.

Given that :

volume of the solute = 66.7 mL

volume of the solution = 222.2 mL

by using the volume % formula we can directly determine the volume % of ethanol, the percent by volume  expression is given as :

volume % = (volume of solute / volume of solution ) × 100 %

volume % = (66.7 / 222.2 ) × 100 %

volume % = 0.300  × 100 %

volume %  = 30 .0 %

( v / v ) % = 30.0 %

Thus, the percent by volume is 30.0 %.

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Given chemical reaction,

Glucose + Oxygen → carbon dioxide + water

Reactants : Glucose and oxygen.

Products : carbon dioxide and water.

Each chemical reaction is made up of three main components: the reactants (located on the left side of the reaction equation), the products (located on the right side of the reaction equation), and the particular reaction conditions, which are listed above or below the arrows in the middle of the reaction equation.

Combustion is one of the five fundamental types of chemical reactions, along with combination, decomposition, single-replacement, and double-replacement. You can classify a reaction into one of these groups by looking at the reactants and products of the reaction in question. It is possible for some reactions to fall into more than one category.

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6 moles of chlorine gas can be produced if 4 moles of fecl3 react with 4 moles of o2.

FeCl3+O2-->Fe2O3+Cl2  is not balanced.

We first need to balance the equation. The balanced equation:

4FeCl3 + 3O2 ==> 2Fe2O3 + 6Cl2

moles FeCl3 present =4 moles

moles O2 present = 4 moles

Since the mole ration in the balanced equation is 4 FeCl3 : 3 O2, the limiting reactant will be FeCl3.

So, moles Cl2 that can be produced = 4 moles FeCl3 x 6Cl2/4 moles                   FeCl3 = 6 moles Cl2.

What do you mean by Chlorine gas?

Chlorine gas is a greenish-yellow gas with a pungent odor that is highly toxic and corrosive. It is often used as a disinfectant and bleach in water treatment and swimming pools. Exposure to chlorine gas can cause severe irritation of the eyes, skin, and respiratory tract, and can even be fatal in large doses.

What are Moles?

Moles are a unit of measurement in chemistry used to measure the amount of a substance. The mole is defined as the amount of a substance that contains as many elementary entities (atoms, molecules, ions, etc.) as there are atoms in exactly 12 grams of carbon-12. The mole is a base unit in the International System of Units (SI) and has the symbol mol.

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Empirical formula of a compound can be determined using their number moles in the given weights. Thus number of moles of both gallium and phosphorous are 0.013 . Thus, empirical formula of this composition is GaP.

Empirical formula of a compound is derived from the number of moles of each element present in the compound. It will be different from the molecular formula of the compound.

Atomic mass of phosphorous = 31 g/mol

Atomic mass of gallium = 69.72 g/mol

Number of moles of 0.412 g of P = 0.412 g/31 g = 0.013.

No.of moles in 0.928 g of Ga = 0.928 / 69.72 = 0.013.

The ratio of their number of moles = 0.013 :0.013 = 1 :1.

Therefore, the empirical formula of the compound containing 0.928 g of gallium and 0.412 g of phosphorus is GaP.

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Squirrel: Digestive, Circulatory, Muscular, and Nervous systems.

Soccer: Skeletal/muscular, circulatory, respiratory, and body systems.

For Squirrel:

The digestive system functions to break food down into smaller pieces that are more suitable for swallowing and absorbing the available nutrients. It transports to various cells of living organisms.

musculature allows animals to keep their balance on branches and avoid falling.

The nervous system controls all living things. The nervous system controls all physical activity. Among many other functions, it is involved in maintaining balance and maintaining alertness during meals.

Soccer player:

This person is trying to hit the ball to score a goal. He seems to be adjusting his arms and legs to allow this.

The muscular and skeletal systems work together to support and strengthen the body. They allow the movement of the whole body to reach the target.

The respiratory system is also involved in this person's running performance. He has to breathe constantly to get enough oxygen while running and exhaling exhaust fumes.

The circulatory system transports oxygen to various cells in the body that use it on demand, especially muscle cells. The system also removes waste.

The nervous system controls all physical activity. It performs a variety of functions, including maintaining balance and coordination while running, alerting other players and focusing on the ball, and controlling a player's thoughts and strategies during the game.

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The statement that is correct about real machines is that work output is less then work input. So the correct option is A.

This is correct because in a real machine the production of work will never be greater than the input it has of work, since the machines themselves will lose energy in some way during the formation of the production of work. When losing energy, then, there will be less production and material than there was at the beginning of production.

This is quite the opposite in an ideal machine, where all the work that will be put in becomes the work output. It changes because in the ideal situation it does not take into account various variables that occur in reality that can cause energy to be lost in the process.

Therefore, we can confirm that the correct option is A. work output is less then work input.

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Which of the following is true of real machines?

A. work output is less then work input

B. work output equals work input

C. work input is decreased because of friction

D. work output is greater than work input

Answer:

a

Explanation:

Zinc fluoride is the term given to the mixture of the ions zinc (zn+2) and fluoride (f1).

Reactivity, by a reaction with the carbon dioxide in the air. Zinc emits zinc oxide fumes as it burns in the air, which produces a vivid bluish-green flame. With acids, alkalis, and other non-metals, zinc interacts easily.

Under normal circumstances, zinc and air quickly react, gradually generating a dull, grey zinc oxide covering. Zinc also combines to halogens, oxygen, chalcogens, alkalis, acids, ammonia and ammonium salts, as well as less reactive metals. Zinc is an amphoteric metal because it may react with the both acids and alkalis.

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The two changes that can be classified as physical are as follows:

A physical change in chemistry is a change affecting the form of a chemical substance, but not its chemical composition.

When matter changes its observable properties, we can say it has undergone a physical change.

Physical change is a type of change where the physical properties of matter change. Physical changes include;

Therefore, melting of ice, which is a change of state and shattering of glass are examples of physical change.

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According to the concept of diffusion the water will move from 5% salt solution to 15%salt solution.

Diffusion is defined as the process of movement of molecules which takes place under concentration gradient. It helps in movement of substances in and out from the cell.The molecules move from lower concentration region to a higher concentration region till the concentration becomes equal.

There are 2 main types of diffusion:

1) simple diffusion-process in which substances move through a semi-permeable membrane without the aid of transport proteins.

2) facilitated diffusion- It is a passive movement of molecules across cell membrane from higher concentration region to lower concentration.

There are 2 types of facilitated diffusion one is osmosis and dialysis.

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Answer:

Relative atomic mass of uranium = (238 x 0.50) + (235 x 0.20) + (234 x 0.30) = 236.3

The component in the solar cell system which provides electrons to replace the electrons released by the dye simply is the graphite layer.

The graphite layer is one of the major parts oth the solar cell. It help in the provision of electrons by acting as a counter electrode within the electrolyte. In order, this layer is part responsible for replacing electrons produced by dyes.

In conclusion, we can now confirm from all said and done from above that the solar cell too has a way of producing electrons.

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The airbags that protect people in car crashes are inflated by the extremely rapid decomposition of sodium azide, which produces large volumes of nitrogen gas.

So the balanced chemical equation is:

NaN₃(s) → Na(s) + 1.5 N₂(g)

Since, pV=nRT

The mass of sodium azide = 79.3g

What is nitrogen gas?

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Answer:

1558.27 ml or 1.56 L

Explanation:

The molecular mass of octane is 114.23 g/mol so 1.00 g of octane equals to:

(1.00 g( x (1 mol/114.23g) = 0.00875 mol

From the chemical equation:

2C8H18 + 25O2 --> 16CO2 + 18H2O

you know that 2 mol of octane will produce 16 mol of CO2

so 0.00875 mol of octane will produce:

0.00875 x (16/2) = 0.07 moleof CO2

The molecular mass of CO2 is 44.01 g/mol so 0.07 mol will equal to

44.01 x 0.07 = 3.0807 g of CO2

Under “standard” conditions of 0 degrees Celsius and 1 atmosphere of pressure, carbon dioxide exhibits a density of 0.001977 g/mL

since d = m/V => V = m/d = 3.0807/0.001977 = 1558.27 ml or 1.56 L

NOTE: if you have a specific temperature or pressure, you can use the formula for ideal gas PV=nRT to solve for volume.

I hope this helps you to understand the question

If the solvent level covers the sample, the sample spot will be washed off into the solvent before it travels up the TLC plate

The intermolecular interactions between the solvent and the solute are the main determinant of the solubility of the solute in a given solvent. The solute will dissolve in the solvent if the solvent surrounds and solvates the solute. In contrast to interactions between the solute and other solutes or between the solvent and other solvents, the solute must therefore create greater interactions with the solvent in order to dissolve. It is questionable if a homogeneous solution will develop in a mixture if the solvent-solute interactions are weaker than the solvent-solvent interactions and the solute-solute interactions.

why should care be taken tha tht easample is above the solvent level before the tlc plat eis placed into the devleioping hcambe

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Answer:C

Explanation:I got it correct not no genius though.

6 co2 molecules required during the calvin cycle to make one molecule of glucose beacuse One carbohydrate molecule requires six rounds of the Calvin cycle to create since it contains six carbon atoms (one for each carbon dioxide molecule fixed).

What is calvin cycle?

The C3 cycle is another name for the Calvin cycle. The process by which the carbon from the carbon cycle gets fixed into sugars is a series of chemical processes. The chloroplast of the plant cell is where it takes place.

Because the main stable intermediate is the 3-carbon compound glyceraldehyde-3-phosphate, C3-type plants—so named because it is their most frequent set of carbon fixation reactions—are observed. The Calvin cycle, which best describes these reactions.

The processes of photosynthesis that utilise the energy accumulated by the light-dependent reactions to create glucose and other carbohydrates molecules are known as the Calvin cycle.

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The noble gas family includes the element xenon, which has five different energy levels.

Any of a class of rare gases with high stability and very low reaction rates, such as helium, neon, argon, krypton, xenon, and occasionally radon. also known as inert gas. A collection of chemical elements known as the noble gases have a number of things in common. Under typical circumstances, they are all monatomic, tasteless, and colourless gases with low chemical reactivity. Helium, neon, argon, krypton, xenon, and radioactive radon are the six types of noble gases that are found in nature. Noble gases have entirely filled outer electron shells, are most frequently encountered as monatomic gases, and have no tendency to combine with other elements. As a result, they extremely infrequently form compounds with other elements. But it is conceivable to cause a noble gas to respond, just as one might force a nobleman to lose his honor.

Due to their filled valence shells (octets), which render them incredibly nonreactive, the noble gases (Group 18), which are found at the far right of the periodic table, were formerly known as the "inert gases." Compared to other element groupings, the noble gases were characterized at a relatively late stage.

The noble gases are employed to create inert atmospheres, usually for arc welding, to shield specimens and prevent chemical reactions. The substances are utilized in lasers as well as lamps like neon and krypton headlamps.

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The molarity of the acid is : 0.82 Molar

Calculate the molarity of acid?

Volume of acid = 25 ml

Molarity of base = 0.5 M

Volume of base = 41.00 ml

Since, acid and base reacts in 1:1 stoichiometric ratio, we can use the molar equivalence formula as:

M(acid) × V(acid) = M(Base) × V(Base)

M(acid) = 0.82 M

What is Molarity?

Molarity (M) is the amount of a substance in a given volume of solution. Molarity is defined as the number of moles of solute per liter of solution. Molarity is also called the molarity of a solution.

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Answer:

The energy output objects that work with solar panels include solar inverters, charge controllers, batteries, and electric grid systems.

Explanation:

Answer:

0-1

Explanation:

An electron is a negatively charged subatomic particle, So -1 is the correct option.