hich of the following statement(s) is/are correct? i) the energy change when is (hypothetically) formed from 8 protons and 8 neutrons is known as the energy defect. ii) the splitting of a heavier nucleus into two nuclei with smaller mass numbers is known as nuclear fission. iii) the first example of nuclear fission involved bombarding with nuclei

Answer:

d = 0.84 g/cm³

Explanation:

Given data:

Mass of wood = 2.85 g

Volume of water = 20.0 mL

Volume of water + wood = 23.4 mL

Density of wood = ?

Solution:

Volume of wood = (Volume of water + wood ) - Volume of water

Volume of wood = 23.4 mL - 20.0 mL

Volume of wood = 3.4 mL

1 mL = 1 cm³

Density of wood:

d = m/v

d =  2.85 g / 3.4cm³

d = 0.84 g/cm³

If a cheetah can run 1 meter in 0.0346812 seconds, the cheetah can run 64.5mph.

The average speed of a moving body can be calculated by dividing the distance moved by the body by the time taken. That is;

Average speed = Distance/Time

Average speed = 1m/0.0346812s

Average speed = 28.83m/s.

The average speed in m/s can be converted to mph as follows:

1 metre per second = 2.237 miles per hour

28.83m/s = 64.5mph

Therefore, if a cheetah can run 1 meter in 0.0346812 seconds, the cheetah can run 64.5mph.

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An alloy is made of two or more different metals.These metals are of different sizes. This cause a distortion in the system and leads to a slide of of atoms when a force is applied and make it brittle.

Alloys are mixed metals. They are widely used in constructions, in electronic devices and in other industries due to their potential application superior over the pure metals.

There are atoms of various sizes in an alloy. The layers of atoms in pure metal are distorted by the smaller or larger atoms. This indicates that more force is needed to get the layers to slide over one another. Compared to pure metal, the alloy is tougher and more durable.

The irregularity of the atoms that make up high-entropy alloys is what gives is their immense strength. When the alloy is deformed, this disorder makes it difficult for the alloy's dislocation flaws to migrate through its crystal structure. But under adequate pressure, this also makes the alloy highly brittle.

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Answer:

D

Explanation:

A. is wrong.  1cm³ = 1 mL

B. is wrong   1000 mL = 1 L

C. is wrong   1 m = 10 dm

D. is correct there are 100 centigrams in 1 gram

Answer:

All igneous rocks the basis of the rock cycle are formed by plate tectonics. ... The heat from the mantle that fuels plate tectonics causes both igneous and sedimentary rocks to be turned into metamorphic rocks. The metamorphic rocks can be eroded into sedimentary rocks are remelted back into igneous.

Explanation:

Answer:

What is an mass number?

Mass number is an integer (whole number) equal to the sum of the number of protons and neutrons of an atomic nucleus. In other words, it is the sum of the number of nucleons in an atom. Mass number is often denoted using a capital letter A. Contrast this with the atomic number, which is simply the number of protons.

Explanation:

The atomic mass of elements could be predicted using Dmitri Mendeleev's periodic table.

The Periodic Table of elements is an arrangement of elements in groups and periods based on increasing atomic number.

The first periodic table of elements was designed by Mendeleev.

The arrangement was based on increasing atomic mass of elements.

Therefore, atomic mass of elements could be predicted using Dmitri Mendeleev's periodic table.

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Answer:

It helps you......

. Thank you ☺️☺️

Answer:

The last option will form the precipitate reaction of insoluble compound

Sodium is a chemical element hence it does not have calories. Calories refer to the unit of energy contained in food substances. Calories are always used in reference to food substances.

Sodium is one of the essential minerals in the body. It is very important in the functioning of the nervous system. However, sodium has also been linked to risks of heart failure and stroke.

Sodium is not an energy giving substance in food. It does not contain any calories because it is nothing more than just a chemical element. Only chemical compounds used as food such as carbohydrates, fats, proteins etc that have chemical bonds in them can release such energy as calories.

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Explanation:

I hope it helps

ya welcome

Answer:

A. 17

Explanation:

Took the test on Edge & got 100% :D

At 383 K, approximately 79% of N₂O₄ decomposes to NO₂. To find the percentage of N₂O₄  that decomposes at 383 K, we can use the equilibrium constant (K) and the concept of Le Chatelier's principle.

First, let's calculate the equilibrium constant (K) at 298 K using the given standard enthalpy change (ΔrHo) value of 55.3 kJ/mol:
ΔrHo = -RTlnK
55.3 kJ/mol = -8.314 J/mol K * 298 K * lnK

Now, let's calculate the percentage of N₂O₄   that decomposes at 298 K:
K = [NO₂]^2 / [N₂O₄  ]
K ≈ e^(-6.49)

Assuming the initial pressure of N₂O₄   is the same at 0.100 bar, let's calculate the concentrations of N₂O₄   and NO₂ at equilibrium at 298 K using the given information that 58% of N₂O₄   has decomposed:
[N₂O₄  ] = (0.100 bar) * (1 - 0.58) ≈ 0.042 bar
[NO₂] = 2 * (0.100 bar) * 0.58 ≈ 0.116 bar

Now, let's calculate the concentration of N₂O₄   at 383 K using the same initial pressure of 0.100 bar:
[N2O4] = 0.100 bar * (1 - x)

Therefore, at 383 K, approximately 79% of N₂O₄   decomposes to NO₂.

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To find the number of moles represented by a certain number of particles, you can use Avogadro's number and the concept of molar mass.

Avogadro's number (symbolized as N_A) is a fundamental constant that represents the number of particles (atoms, molecules, ions, etc.) in one mole of a substance. It is approximately equal to 6.022 × 10²³ particles/mole.

Molar mass is the mass of one mole of a substance and is expressed in grams/mole. It represents the sum of the atomic masses or molecular masses of the constituent particles in a substance.

To calculate the number of moles, you can follow these steps;

Determine the number of particles you have (atoms, molecules, ions, etc.).

Identify the molar mass of the substance or the average molar mass if it's a mixture.

Divide the number of particles by Avogadro's number to convert them into moles. The formula is:

Moles = Number of Particles / Avogadro's number

Moles = Number of Particles / (6.022 ×10²³ particles/mole)

The result will give you the number of moles represented by the given number of particles.

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--The given question is incorrect, the correct question is

"Explain how you would find the number of moles that are represented by a certain number of representative particles."--

Answer:

Eggs Frying

Explanation:

;)

Answer:

Explanation:

Titration: titrate twice, the first time with an indicator to determine how much sodium hydroxide is needed to completely react with hydrochloric acid, and the second time without an indicator to prevent the contamination of the sodium chloride salt produced

Answer:

1. 3H2S + 2HNO3 -----> 2NO + 4H2O + 3S

Explanation:

H2S + HNO3 ----->  NO + H2O + S

There are 3 O's on left and  only 2 on right so  put 2 before NO:

H2S + HNO3 ----> 2NO + H2O + S

Now we have 2 N's on left so put 2 before HNO3:

H2S + 2HNO3 -----> 2NO + H2O + S

4 H's on the left so

H2S + 2HNO3 -----> 2NO + 2H2O + S

That makes 6 O's on left so  we write

H2S + 2HNO3 ----> 2NO + 4H2O + S

Now there 8 H's on the right but only 4 on the right so we adjust H2S and S:

3H2S + 2HNO3 -----> 2NO + 4H2O + 3S

Now it balances!

Basically you 'play around' with the  quantities of each element in this way.

The value of 8D of water vapor in isotopic equilibrium with fresh water whose 8D value is -65%0 is -67.79125‰.

The expression for calculating 8D of water vapor in isotopic equilibrium with fresh water can be given by: 8D = α 8D (vapor) + (1 - α) 8D (liquid). Where,α is a fractionation factor and 8D (vapor) and 8D (liquid) are the deuterium enrichments in water vapor and liquid, respectively.

The value of α is given by:a (liquid-vapor) = 1.090So,α = (a (liquid-vapor) - 1) / (a (liquid-vapor) + 1)α = (1.090 - 1) / (1.090 + 1)α = 0.045So,8D = α 8D (vapor) + (1 - α) 8D (liquid)Given,8D (liquid) = -65‰ (‰ denotes permil, which is equal to parts per thousand)

Substitute the given values in the expression and simplify:8D = 0.045 × 8D (vapor) + (1 - 0.045) × (-65)8D = 0.045 × 8D (vapor) - 61.9258D + 2.79125 = 8D (vapor)

Therefore,8D (vapor) = 8D - 2.79125= -65 - 2.79125= -67.79125‰ (answer)Therefore, the value of 8D of water vapor in isotopic equilibrium with fresh water whose 8D value is -65%0 is -67.79125‰.

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Okay, let's think through this step-by-step:

1) The initial equilibrium lies on the right side, favoring the products (H2 and O2 gases), because the standard enthalpy change (AH) is positive for this reaction, meaning the products are more stable.

2) When we increase the volume of the container, the pressure decreases according to Boyle's law (P=k/V).

3) A decrease in pressure favors the side with the greater number of moles of gases. In this case, the product side has 2 moles of gas (H2 + O2), so the equilibrium will shift to the right.

4) Therefore, when the volume increases, the equilibrium will shift further in favor of the products (H2 and O2 gases).

The answer is a: It will shift in favor of the products.

Let me know if this makes sense! I can re-explain anything that is unclear.

Answer: crust, rocks, upper mantle, lava, outer core, rock

Explanation: others i dnt know

The concentration of the H₂SO₄ solution Erica used was approximately 2.0 M.

To find the concentration of H₂SO₄ solution used by Erica, we can use the concept of stoichiometry and the balanced chemical equation for the neutralization reaction between KOH and H₂SO₄:

KOH + H₂SO₄ -> K₂SO₄ + 2H2O

From the balanced equation, we can see that the mole ratio of KOH to H₂SO₄ is 1:1. This means that the number of moles of H₂SO₄ used in the reaction is equal to the number of moles of KOH. We can use this fact to calculate the number of moles of H₂SO₄ used:

moles of KOH = volume of KOH solution (in L) x concentration of KOH solution
moles of KOH = 80.0 mL x (1 L/1000 mL) x 0.70 mol/L = 0.056 mol

Since the mole ratio of KOH to H₂SO₄ is 1:1, the number of moles of H₂SO₄ used is also 0.056 mol. Now we can use the same formula as above to calculate the concentration of H₂SO₄:

concentration of H₂SO₄ = moles of H2SO4 / volume of H₂SO₄ solution (in L)
concentration of H₂SO₄ = 0.056 mol / (28.0 mL x 1 L/1000 mL) = 2.00 mol/L

Therefore, the concentration of the H₂SO₄ solution Erica used was 2.00 M.

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The neutral atom with a nuclear charge of +9 and a nuclear mass of 19 amu is fluorine-19. It has 10 neutrons and 9 electrons.

The atomic number of an element is equal to the number of protons in its nucleus. Therefore, if an atom has a nuclear charge of +9, it means it has 9 protons. The nuclear mass of an atom is the sum of its protons and neutrons. Since we know the nuclear mass of this atom is 19 amu, and it has 9 protons, it must have 10 neutrons (19 - 9 = 10).

To determine the number of electrons, we need to know the charge of the atom. Since it is a neutral atom, it has no net charge. This means the number of electrons must be equal to the number of protons, which is 9.

Therefore, the identity of the neutral atom is fluorine-19, with 9 protons, 10 neutrons, and 9 electrons.

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Answer:

6. the box with more particles in it will be more dense than the same box with fewer particles, so basically a

Based on the given information, the white solid is expected to be inorganic.

The solubility in water and the non-flammability of the white solid suggest that it is likely an inorganic compound. Here's the reasoning behind this conclusion:

Solubility in water: Organic compounds tend to be less soluble in water compared to inorganic compounds. This is because organic compounds often have nonpolar or weakly polar bonds, making them more likely to interact with other nonpolar substances rather than water molecules. Inorganic compounds, on the other hand, can form ionic or highly polar bonds that readily interact with water, increasing their solubility.

Non-flammability: Organic compounds are typically composed of carbon and hydrogen atoms, and many organic compounds are flammable. This is because the presence of carbon-hydrogen bonds in organic compounds allows for the release of energy during combustion. Inorganic compounds, on the other hand, often lack carbon-hydrogen bonds and are less likely to be flammable.

Considering the solubility in water and the non-flammable nature of the white solid, it is more likely to be an inorganic compound rather than an organic one.

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The equilibrium vapor pressure with respect to water (eow) is 259.9 Pa. assume that saturation vapor pressure is same as equilibrium vapor pressure.

Therefore, the RH at the frost point is  

RH = (eow / saturation vapor pressure) × 100

= (259.9 Pa / 259.9 Pa) × 100

= 100%

b) At T = -11 °C, we need to compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi) to determine if ice particles will form. From the given table, at T = -11 °C, the equilibrium vapor pressure with respect to water (eow) is 237.7 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 165.3 Pa.

The air is supersaturated with respect to ice, and the presence of Kaolinite particles can provide surfaces for water droplets to condense onto, leading to the formation of ice particles.

c) At T = -12 °C, we compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi). From the given table, at T = -12 °C, the equilibrium vapor pressure with respect to water (eow) is 217.3 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 181.2 Pa.

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Answer:

Some abiotic factors of the taiga are temperature, precipitation, soil, and sunlight.

Explanation:

emperature affects the taiga because the winter temperature range is -65*F to 30*F (-54*C to -1*C), while the temperature range in the summer is 20*F to 70*F (-7*C to 21*C)

Precipitation affects the taiga because there's some precipitation that falls [30-85 cm. (12-33 in.)].

Soil affects the taiga because there's some acidic and low-in-nutrients soil, and some fertile soil.

Sunlight affects the taiga because there are small amounts of it that reach the ground.

The taiga biome's abiotic components include temperature, sunshine, soil, air, water, etc. Cold arctic air predominates in the taiga environment. The taiga receives more light in the summer, which causes the days to be hotter.

Abiotic elements, also known as abiotic factors, are non-living chemical and physical elements of the environment that have an impact on the health of living things and the operation of ecosystems. Biology as a whole is supported by abiotic causes and the phenomena that go along with them.

Biotic and abiotic components, such as rainfall, in that order. The taiga is the biggest biome on Earth's surface and features a diversity of migratory and resident creatures. It also has long, cold, and dry winters and short, warm, and moist summers.

The Taiga biome is restricted by four primary criteria. Fire, temperature, the quantity of nutrients in the soil, and sunshine are the four limiting elements. Because certain plants, like the Jack Pine, recover after fire, it is a limiting element in the Taiga biome.

Thus, The taiga biome's abiotic components include temperature, sunshine, soil, air, water, etc.

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Answer:

To determine which pair of ions will form a precipitate when their 0.1 M solutions are mixed, we need to examine the solubility rules for common ionic compounds.

Ca2+ and CO3^2-:

According to the solubility rules, most carbonates (CO3^2-) are insoluble, except for those of alkali metals (Group 1) and ammonium (NH4+). Therefore, when Ca2+ and CO3^2- ions are mixed, they will form a precipitate of calcium carbonate (CaCO3).

NH4+ and PO4^3-:

The solubility rules indicate that most phosphates (PO4^3-) are insoluble, except for those of alkali metals (Group 1) and ammonium (NH4+). Therefore, when NH4+ and PO4^3- ions are mixed, they will form a precipitate of ammonium phosphate (NH4)3PO4.

Al3+ and NO3-:

The nitrate ion (NO3-) is generally soluble and does not form a precipitate with any cation. Therefore, when Al3+ and NO3- ions are mixed, no precipitate will form.

Pb2+ and Cl-:

According to the solubility rules, most chlorides (Cl-) are soluble, except for those of silver (Ag+), lead (Pb2+), and mercury (Hg2^2+). Therefore, when Pb2+ and Cl- ions are mixed, they will form a precipitate of lead chloride (PbCl2).

Based on the solubility rules, the pair of ions that will form a precipitate when their 0.1 M solutions are mixed are Ca2+ and CO3^2-, resulting in the formation of calcium carbonate (CaCO3).

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