a sample of oxygen gas has a volume of 545 ml at 35°c. the gas is heated to 151ºc at constant pressure in a container that can contract or expand. what is the final volume of the oxygen gas?

The molecular formula of the compound is C1H2.

The molecular formula of a compound can be determined by analyzing its percent composition by mass. The first step is to convert the percent composition by mass to the mass of each element in one mole of the compound.

85.64% C = (85.64 g C/100 g compound) * (1 mole C/12.01 g C) = 7.13 moles C/mole compound

14.36% H = (14.36 g H/100 g compound) * (1 mole H/1.008 g H) = 14.22 moles H/mole compound

The next step is to find the ratio of atoms in the compound by dividing the moles of each element by the smallest moles of any element.

C:H = 7.13 moles C/mole compound : 14.22 moles H/mole compound = 7.13:14.22

To find the molecular formula, we need to divide the moles of each element by the lowest ratio of atoms to obtain the least whole number ratio of atoms in the compound.

C:H = 7.13 moles C/mole compound / 7.13 : 14.22 moles H/mole compound / 7.13 = 1 : 2

Therefore the molecular formula of the compound is C1H2

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The atomic model changes over time because the atomic model was based on theories and discoveries.

Because the atomic model was built on theories and observations, it evolves with time. The atomic model was altered as a result of our false assumptions about the atomic form being shown through experiments to be made up of even smaller particles.

Bohr's and Rutherford's models of the atom were the two main ones. The model evolved over time when electrons, protons, neutrons, orbitals, etc. were discovered.

To explain how electrons might form stable circles around the centre of a molecule, Bohr introduced his quantized shell model of the molecule in 1913. Radiation can occur simply when an electron jumps from one circle to the next.

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The sound is a mechanical wave because; the sound wave causes vibration in the air.

We know that a wave is a mechanical wave when the direction of the wave motion is parallel to that of the motion that is producing the wave. Also for the mechanical waves, we know that they must be able to pass through matter.

Having this in mind, let us remind ourselves that sound moves through the air and its sets the particles of the air into vibration as we know as such sound is a mechanical wave.

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Missing parts;

The diagram below shows a sound wave moving through air.

What about the diagram that shows that the sound wave is a mechanical wave?

The sound wave was made by a machine.

The sound wave vibrates perpendicular to the direction of the wave motion.

The sound wave causes extra air particles to form.

The sound wave causes vibration in the air.

Answer:

Stanley Classic Trigger Action travel Mug

Explanation:

The Stanley Classic Trigger Action travel mug offers heat retention for an impressive seven hours. It also keeps cold beverages chilled for 10 hours, and iced beverages icy for a whopping 30 hours.

Extra:

I hope this helped at all. If you need further assistance just comment down below saying I need more details and I'll help you further.

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(a) Ni(s) + MgSO4(aq) →→→→ NiSO4(aq) + Mg(s) = Not Possible

(b) 3Mg(s) + Al₂(SO4)3(aq) →→→→ 3MgSO4(aq) + 2Al(s) = Possible

(c) Pb(s) + 2H₂O(1)→→→→→ Pb(OH)₂(aq) + H₂(g) = Possible

(a) If you look at the table, nickel is way below magnesium and therefore less reactive. As a result, it will not be able to steal SO4 from magnesium because it is not reactive enough, proving that answer A is incorrect.

(b) Magnesium is more reactive than aluminium, and since it is located directly above the latter, it is feasible.

(c) Lead, which is more reactive than hydrogen, can also be C because Pb.

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When rounding to a significant figure, look at the first non-zero digit if doing so to one. If rounding to two significant figures, look at the digit following the first non-zero digit.

Between any two non-zero digits, all zeros are important. Seven significant digits are seen in, for instance, 108.0097. There is never any significance for any zeros that are both to the right and left of the decimal point and a digit that is not zero. As an illustration, 0.00798 has three significant digits. The zeros in between two non-zero digits ARE important. Leading zeros have no relevance. The trailing zeros to the right of the decimal point ARE important. A full number's trailing zeros when represented by a decimal are important.

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(A)should have three significant figures, as the lowest number of significant figures is always correct. 0.004911/3.87 = 0.001268 = 0.00127 = 1.27(10)-3. (B) 4*6 has two significant numbers of 1, and 24 rounds to 20 to equal 2(10)1.

The significant figures of a number are the important or critical digits that correctly convey the meaning of that number. For instance, the number 6.658 has four significant digits. The statistics' precision comes from these enormous sums. They are sometimes referred to as significant digits. Significant figures, also known as the significant digits, accuracy, or resolution, are the digits in a number that are reliable and necessary to indicate the quantity of anything in positional notation. If a number indicating the result of a measurement has more digits than the number of digits permitted by the measurement resolution, only the digits allowed by the measurement resolution are reliable, and only these can thus be relevant figures.

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Answer:  Increasing or decreasing the temperature will cause chemical changes to occur faster or slower. Physical changes turn solids into liquids and liquids into gases when you increase the temperature. Decreasing the temperature turns gases into liquids and liquids into solids. Hope this helps!

Answer:

5.30 is the probability of a no longer exists in a singie than the first half in a video of a different characters are

Answer:

ice water by its temperature it makes you want more to drink. while room temperature feels like you need more and more water to not feel dehydrated

Explanation:

Answer:

Vaporization and Sublimation require the release of energy.

Explanation:

Vaporization is the process of converting a liquid into a gas. It requires energy to break the intermolecular forces between the liquid molecules, so it releases heat energy.

Sublimation is the process of converting a solid directly into a gas, skipping the liquid phase. It also requires energy to break the intermolecular forces between the solid molecules and release the solid particles into the air, so it releases heat energy as well.

Melting and Deposition, on the other hand, are processes that occur with the absorption of energy.

Melting is the process of converting a solid into a liquid. It requires energy to overcome the intermolecular forces between the solid particles and create a liquid, so it absorbs heat energy.

Deposition is the process of converting a gas into a solid, it also requires energy to overcome the intermolecular forces between the gas particles and create a solid, so it absorbs heat energy as well.

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Answer: Deposition

Explanation: right for acellus.

Zinc-66 with atomic number 30 has 30 protons, 36 neutrons and 30 electrons.

The atomic number of an element is the number of protons in an atom of that element.

The atom of an element is made up of three subatomic particles namely; protons, neutrons and electrons.

Proton is the positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element while electron is the subatomic particle having a negative charge and orbiting the nucleus.

Neutron, on the other hand, is the subatomic particle forming part of the nucleus of an atom and having no charge. It is got by subtracting the number of protons of an atom from the mass number.

According to this question, an atom of Zinc element is said to have a mass number of 66 and atomic number 30. This suggests that the zinc atom posseses the respective number of subatomic particles as illustrated in the main answer part.

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The number of protons is equal to the number of electrons.

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The structure of Cyclopropane has three methylene groups (CH2) that are linked together to form a ring or cyclic structure.

Cyclopropane is a cyclic hydrocarbon that has only single bonds. These hydrocarbons have properties similar to open-chain compounds and behave like noncyclic alkanes. Cyclopropane is an exception because it has a highly strained ring, as the C-C-C forms a 60° angle and the preferred bond angle is 109.5°.

The molecular formula of cyclopropane is (CH2)3. 1-methyl ethyl is its chemical name. It functions as an inhalation anaesthetic. It was first studied because it was thought to be the toxic element in ethylene.

The skeletal structure of cyclopropane is shown below.

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The number of the nitrogen molecules that reacted with the excess of the hydrogen to make 2 × 10¹⁰ molecules of the ammonia is 1 × 10¹⁰ molecules.

The reaction is given as :

N₂  +  3H₂   --->  2NH₃

The number of the molecules of the ammonia =  2 × 10¹⁰ molecules

1 molecules of the ammonia will produces the 2 molecules of the ammonia

The number of the molecules of the nitrogen = ( 1/ 2) ×2 × 10¹⁰ molecules

The number of the molecules of the nitrogen = 1 × 10¹⁰ molecules.

Thus, the molecules of the nitrogen is 1 × 10¹⁰ molecules.

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The number of grams, multiply 0.5 moles by the molar mass of H₂SO4: 49.04 g.

Molar mass is the mass of a given substance (chemical element or compound) divided by the amount of substance in moles. It is usually expressed in grams per mole (g/mol). Molar mass is an important concept in chemistry, as it is used to calculate the mass of a substance from the amount of moles of the substance. It is also used to calculate the amount of moles of a substance from the mass of the substance. Molar mass is also used to calculate the density of a substance, as well as the molar volume of a substance.

The number of grams in 0.5 moles of H₂SO4 can be calculated using the molar mass of H₂SO4, which is 98.08 g/mol. To calculate the number of grams, multiply 0.5 moles by the molar mass of H₂SO4:
0.5 moles x 98.08 g/mol = 49.04 g

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In light of this, 2-methyl-2-butene is more stable than 2-methyl-1-butene. The relative stability of the product turns proven to be the crucial element in determining the primary product when a small size base is utilized for the elimination reaction, such as OH-, CH3O-, or EtO-.

This is due to the fact that major product is more frequently supplanted than minor product, making them more stable. In contrast to 2-Methyl-1-butene, we, therefore, created more 2-Methyl-2-butene. Zaitsev's rule is an empirical formula used to foretell the main byproducts of elimination reactions. The more stable alkene with the more strongly substituted double bond is the main product in an elimination process, according to this statement.

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The electronic configuration of Cd4+ is [Kr] 4d7 5s1.

Electronic configuration also termed as electronic structure as well as electron configuration. It is the arrangement of the electrons in orbitals around an atomic nucleus.

Cadmium is a transition metal which is poisonous in nature. It is denoted by the symbol "cd". Cadmium is located in the d-block elements and the 12 group of the modern periodic table which is possessing an atomic number of 48 and its atomic mass will be 112.411g. The color of the cadmium is silvery grey metallic and the density will be 8.6g/cm3. It commonly used as a sacrificial anode to protect steel and iron from corroding and it is also used in nickel-cadmium batteries.

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The final electron acceptor of NADH and FADH2 is oxygen

Electron transport is the final process of aerobic respiration that occurs in the inner mitochondrial membrane. The goal of electron transport is to generate energy from the NADH and FADH produced by the previous steps in aerobic respiration (glycolysis, oxidative decarboxylation, and the Krebs cycle).

FADH and NADH are broken down into FAD+ and NAD+ and then hydrogen atoms are removed respectively. Hydrogen is brought into the mitochondrial matrix via ATPase, then the incoming hydrogen atoms will convert ADP into ATP. Then the hydrogen ions are captured by oxygen and produce water molecules or H2O. This is why oxygen acts as the final electron acceptor

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Answer:

B.

a pandemic would be like COVID-19 as it spread world wide

a epidemic would be like Japanese small pox incident because it was mostly in Japan

Answer:  Aberham Lincon was an basketball player for the brick walls and then got traded to the wasthiton bottle caps then I will go to the bus stop

Explanation:

Mg3N2:Mg(OH)2:Mg(O H)2 has a mole ratio of 1:3 (Mg3N2:Mg3N2:Mg(OH)2:Mg(O H)2). Following are the moles of Mg(OH)2 Mg(O H)2 that can be generated from 0.21401 moles of Mg3N2 Mg3 N2.

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DNA replication is a process by which this protein is duplicated, that is, an identical copy is synthesized. Thus, from a single molecule of this complex compound, two or more replicas will be derived.

DNA is the basis of genetic material. Through this protein, information is passed from parents to children, which allows genetic sequencing.

It is precisely the replication of this complex protein that allows genetic information to be transmitted from a mother cell to daughter cells.

In DNA replication, the two complementary polymers of the original DNA, when separated, serve as a template for the synthesis of a new strand complementary to the original template strand.

DNA replication begins in the individual when its first cells are formed in the embryonic stage and ends when the organism dies is what allows it to occur in the individual's genetic evolution, although genetic alterations can also occur on occasions due to unknown causes.

Through this process of transcription and translation that takes place in the cell, all the proteins that the organism needs for its functioning are made, which depends on the information stored in the DNA base sequences.

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Caffeine is a natural stimulant found in coffee, tea and cacao plants. In acidic medium it will get protonated and become a conjugate acid.

Caffeine in an acidic medium acts as a base and accept a proton from the acid. The proton is accepted by the double bonded nitrogen in the imidazole ring. This later occurs in resonance with two other structures. The conjugate acid is soluble.

While comparing the resonance structures, we could see that one nitrogen is more basic than the others. This is because all the other nitrogen atoms are covalently bonded with surrounding atoms and stable by completing octet. But in the case of nitrogen in the imidazole ring it has a lone pair of electron, which is available for donation and protonated easily. So the nitrogen numbered 1 is more basic.

So in acidic medium caffeine acts as a base, get protonated and form a conjugate acid, which is soluble.

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The total amount of water produced is equal is 12.5 moles or 250g of H2O.

Moles are small, burrowing creatures found in gardens, yards, and fields. They are members of the Talpidae family and most commonly found in the Northern Hemisphere. Moles are adapted to living underground, where they eat earthworms, grubs, and other small invertebrates. They also consume plant material and are known to damage lawns and gardens. Moles have large claws and a pointed snout which they use to dig tunnels and chambers.

The amount of water produced by the combustion of 25.0g of H2 in the presence of 100g of O2 can be calculated using the balanced equation and the law of conservation of mass. The equation shows that 2 moles of water is produced by the combustion of 1 mole of H2 and 1 mole of O2.

Since 25.0g of H2 is equal to 1.25 moles and 100g of O2 is equal to 5 moles, then the total amount of water produced is equal to 2 * 1.25 * 5 = 12.5 moles or 250g of H2O.

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175 g of sodium acetate trihydrate and 50 mL of distilled water (3.5 g NaC2H3O2. 3H2O per mL H2O) are combined to create the supersaturated solution. The mixture is then heated in a water bath while being occasionally stirred to create a clear, uniform solution.

To make a supersaturated solution of sodium acetate in water, you would need to dissolve more sodium acetate in the water than would normally be possible at a given temperature. This can be achieved by heating the water to a temperature at which more sodium acetate can be dissolved, and then slowly adding the sodium acetate while stirring until no more will dissolve. Once the desired concentration of sodium acetate is reached, the solution should be cooled to room temperature or below, which will cause the excess sodium acetate to come out of solution and form crystals.

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Answer:

- Molecules move from high concentrations to low concentrations.

- Molecules are evenly distributed at the end.

Explanation:

:)

The formula that can be used to calculate the molar mass of water would be molar mass of H + 2 x molar mass of O. Option B.

The molar mass of a compound is simply the sum of the molar weight of the individual atoms that make up the chemical formula of the compound. It can also be defined as the ratio of the mass of a substance and its amount, in moles.

Using the first definition, the molar mass of water whose chemical formula is [tex]H_2O[/tex] can be calculated using the following formula:

Molar mass of   [tex]H_2O[/tex] = molar mass of H + molar mass of O + molar mass of O

In other words:

Molar mass of   [tex]H_2O[/tex] = molar mass of H + 2 x molar mass of O

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The necessary equation to determine the density of the block is "d = 25 g / 8.4 cm".

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The provided metal block will have a density of 3.57 g/cm².

A material's specific gravity can be used to comprehend density in terms that are more relatable by measuring a substance's mass per volume. The ratio of a material's density to that of water is known as specific gravity. It is a relative (unitless) way to express how much something weighs.

Because their atoms are tightly packed together in a tiny area, metals have a high density. Metallic bonding is mostly to blame for this. Strong electrostatic attraction between metal cations and delocalized electrons is known as metallic bonding. As a result, the crystalline lattice structure is arranged in a predictable way.

Volume of the given block = 1.00 x 4.00 x 1.40

⇒ Volume = 5.6 cm³

Density = mass/volume

⇒ Density = 20/5.6 = 3.57 g/cm²

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The correct option is (d) i.e. all answers are correct, To determine the ratios of elements in a compound, we can use several mathematical tools such as:

1. The mole concept and Avogadro's number, which allows us to convert between mass and number of moles of a substance.

2. The chemical formula, which gives the ratio of atoms of each elements in a compound.

3. The law of definite proportions (also known as the law of constant composition), which states that the ratios of elements in a pure compound are always the same, regardless of the source or amount of the compound.

All these tools can be used to determine the ratios of elements in a compound like magnesium oxide (MgO) and magnesium metal (Mg), as well as in any other compounds.

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Option A. 3Cu + 2AlCl3 --> 3CuCl2 + 2Al is correct.

The products of the reactants Cu + AlCl3 are 3CuCl2 and 2Al. This is a single replacement reaction, in which the copper metal is replaced by the aluminum ions in the aluminum chloride compound, forming copper chloride and aluminum metal.

In a chemical reaction, reactants are substances or elements that interact with or combine with another substance or element (the process of transformation of chemical substances). Typically, these are at the start of the arrows in chemical processes. To further grasp the word, let's look at an example of a chemical equation (a symbol for a chemical reaction).

Water is created when hydrogen and oxygen are combined.

The chemical makeup of water is shown in the aforementioned reaction. A chemical reaction's arrow denotes the direction in which the reaction takes place. This is how the equation would seem if we used the scientific names for its components.

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In order for the unknown's absorbance to fall within the standard curve, dilute it. If the dilution procedure is documented, it is possible to calculate the full strength concentration after determining the diluted quantity.

The solute content in grams dissolved per liter of the solution is used to determine the solution's strength. It serves as a gauge of the solution's potency or concentration. The unit of measurement is grams per liter.

Strong acids are those that totally dissociate in an aqueous solution, while concentrated acids are those that have a high concentration of acid molecules per unit of mixture.

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