PLS HELP MEE !! Andy classified some substances as shown in the table.
Andy's Table
Magnetic Non-magnetic
Steel Plastic
Iron Paper
Leather Wood


Why is Andy's table incorrect?
1.Wood is a magnetic substance.
2.Paper is a magnetic substance.
3.Cobalt is a non-magnetic substance.
4.Leather is a non-magnetic substance.

In 0.75 moles of caffeine, there are a total of 6 carbon atoms, 7.5 hydrogen atoms, 3 nitrogen atoms, and 1.5 oxygen atoms.

To determine the total number of atoms in 0.75 moles of caffeine, we need to consider the molecular formula of caffeine, which is C8H10N4O2. The molecular formula provides the ratios of each element present in the compound. By multiplying the number of atoms in each element by the corresponding coefficient in the molecular formula, we can calculate the total number of atoms. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms in each molecule of caffeine. Multiplying these values by 0.75 moles will give us the total number of atoms in 0.75 moles of caffeine.

The molecular formula of caffeine, C8H10N4O2, provides the number of atoms for each element present in one molecule of caffeine. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms.

To calculate the total number of atoms in 0.75 moles of caffeine, we need to multiply the number of atoms for each element by the coefficient in the molecular formula, and then multiply that by the number of moles (0.75 moles).

For carbon (C): 8 atoms x 0.75 moles = 6 atoms (since there are 8 carbon atoms in one molecule of caffeine).

For hydrogen (H): 10 atoms x 0.75 moles = 7.5 atoms (since there are 10 hydrogen atoms in one molecule of caffeine).

For nitrogen (N): 4 atoms x 0.75 moles = 3 atoms (since there are 4 nitrogen atoms in one molecule of caffeine).

For oxygen (O): 2 atoms x 0.75 moles = 1.5 atoms (since there are 2 oxygen atoms in one molecule of caffeine).

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The O-ring contains approximately 1.046 × 10^18 gold atoms. To calculate the number of gold atoms in the O-ring, we need to determine the volume of the wire and then use the density and atomic mass of gold to convert to the number of atoms. Here's the step-by-step calculation:

1. Calculate the volume of the wire:

  The wire can be considered as a cylinder. The radius (r) is half the diameter, so r = 0.75 mm = 0.75 × 10^(-3) m.

  The length (L) of the wire is given as 100 mm = 100 × 10^(-3) m.

  The volume (V) of the wire is given by the formula: V = πr^2L.

  Substituting the values, we get: V = π(0.75 × 10^(-3))^2(100 × 10^(-3)) = π(0.5625 × 10^(-6))(0.1) = 0.01767 × 10^(-6) m^3.

2. Calculate the mass of the wire:

  The density of gold (ρ) is approximately 19,300 kg/m^3.

  The mass (m) of the wire can be calculated using the formula: m = ρV.

  Substituting the values, we get: m = (19,300 kg/m^3)(0.01767 × 10^(-6) m^3) = 0.3423 × 10^(-3) kg.

3. Calculate the number of moles of gold:

  The molar mass (M) of gold is approximately 197.0 g/mol.

  The number of moles (n) of gold can be calculated using the formula: n = m/M.

  Substituting the values, we get: n = (0.3423 × 10^(-3) kg)/(197.0 g/mol) = 1.739 × 10^(-6) mol.

4. Calculate the Avogadro's number and the number of gold atoms:

  Avogadro's number (NA) is approximately 6.022 × 10^23 mol^(-1).

  The number of gold atoms (N) can be calculated using the formula: N = n × NA.

  Substituting the values, we get: N = (1.739 × 10^(-6) mol)(6.022 × 10^23 mol^(-1)) ≈ 1.046 × 10^18 gold atoms.

Therefore, the O-ring contains approximately 1.046 × 10^18 gold atoms.

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Expressing this answer in scientific notation, the amount of N2 produced according to the engineer's design would be approximately 1.467 x 10^1 mol.

To determine the amount of N2 produced in the reaction between dinitrogen tetroxide (N2O4) and excess hydrazine (N2H4), we need to consider the stoichiometry of the reaction.

The balanced equation for the reaction is:

N2H4 + N2O4 → N2 + 2H2O

According to the stoichiometry of the reaction, for every one mole of N2H4, one mole of N2 is produced. The molar mass of N2H4 is approximately 32.05 g/mol.

Given that the rocket is designed to hold 1.35 kg (1350 g) of N2O4, we can calculate the moles of N2H4 required:

Moles of N2H4 = Mass of N2O4 / Molar mass of N2O4

Moles of N2H4 = 1350 g / 92.01 g/mol ≈ 14.67 mol

Since the stoichiometry is 1:1, the amount of N2 produced will be equal to the moles of N2H4:

Moles of N2 produced = Moles of N2H4 ≈ 14.67 mol

Expressing this answer in scientific notation, the amount of N2 produced according to the engineer's design would be approximately 1.467 x 10^1 mol.

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Answer:

A

Explanation:

The bubbles formed from the plants are always oxygen. The photosynthetic reaction taking place in the plants release oxygen molecules.

Photosynthesis is the biochemical process of synthesizing chemical energy by green plants with the aid of light energy. They store this chemical energy in the form of glucose.

In photosynthetic reaction, water and carbon dioxide are combined to produce glucose and oxygen gas. The bubbles formed in the reaction is oxygen gas.

This process is an event in the carbon cycle to balance the amount of carbon dioxide in the atmosphere and in living matter. Photosynthesis provide the sufficient oxygen for respiration for animals. Hence, option A is correct.

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The distance from the Earth to the Moon in inches is 18304704000 inches.

Distance is a measure of the point of separation of two point or the amount of space between two points.

The SI unit for measuring distance is meters with symbol m.

Other common units of measuring distance or length include:

The distance from the Earth to the Moon is given in miles as 238,900 mi

1 mile = 63360 inches

238900 miles = 238900 * 63360

238900 miles = 18304704000 inches.

Distance = 18304704000 inches.

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Answer: Gemstones can have various internal structures, and it often depends on the type of gemstone. Some common internal structures found in gemstones include:

Explanation: Crystalline Structure: Many gemstones are made up of a regular, repeating arrangement of atoms, forming a crystalline structure. These crystals can have different shapes, such as cubic (e.g., diamond), hexagonal (e.g., emerald), or orthorhombic (e.g., peridot).

Amorphous Structure: Some gemstones lack a defined crystalline structure and instead have an amorphous arrangement of atoms. One example is opal, which is composed of tiny silica spheres in a random arrangement.

Inclusions: Gemstones may contain inclusions, which are solid materials trapped within the gem during its formation. Inclusions can be crystals, minerals, or other materials that give the gemstone a unique appearance and character. In some cases, specific inclusions are used to identify gemstones.

Cleavage and Fracture: The way a gemstone breaks or cleaves along planes of weakness is also a part of its internal structure. Cleavage refers to the tendency of some gems to break along specific planes, creating smooth surfaces, while fracture refers to irregular breaks in gemstones.

Color Zones and Banding: Some gemstones display variations in color within their internal structure, either in the form of color zones or banding. For instance, agate is a type of chalcedony with colorful banding.

Optical Phenomena: Certain gemstones exhibit unique optical phenomena due to their internal structures. Examples include asterism (the star effect in star sapphires), chatoyancy (the cat's eye effect), and iridescence (play-of-color seen in opals).

It's important to note that the internal structure of a gemstone can significantly impact its appearance, durability, and value. Gemologists and experts often study these structures to identify and classify gemstones correctly.

At constant temperatures, the simplest approach to reduce the volume of a gas is to raise its pressure. So, at 700 bar, or 700 times normal atmospheric pressure, hydrogen has a density of 42 kg/m3, compared to 0.090 kg/m3 at normal pressure and temperature.

Hydrogen decreases metal oxides in the reactivity series below. That is, hydrogen can only decrease the oxides of metals that are less reactive than hydrogen itself.

High-Temperature Water Splitting: Chemical processes that split water to make hydrogen are fueled by high temperatures generated by solar concentrators or nuclear reactors.

The oxidation number of hydrogen gas is 0, but the oxidation state of hydrogen atoms in water is +1. As a result, the hydrogen atom has been oxidized. It acts as a reducing agent.

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longitudinal wave.... is the right answer

The ninth term of the given geometric sequence is 1/4096

Yes, the formula that can be used to find the ninth term of a geometric sequence when the fifth term is 1/16 and the common ratio is 1/4 is:

\(a_n = a_5 * r^{(n-5)\)

where

\(a_n\) = the nth term of the geometric sequence

\(a_5\) = the fifth term of the geometric sequence, which is given as 1/16

r = the common ratio of the geometric sequence, which is given as 1/4

n = the term number whose value is to be found, which is 9 in this case

Substituting the given values, we get:

\(a_9 = a_5 * r^{(n-5)\)

\(a_9 = (1/16) * (1/4)^{(9-5)\)

\(a_9 = (1/16) * (1/4)^{(4)\)

\(a_9\) = (1/16) * (1/256)

\(a_9\)= 1/4096

Therefore, the ninth term of the given geometric sequence is 1/4096.

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"Density increases when frozen" is not the property of water. The correct option is (d).

Water is an essential element of life on earth, and it has various unique properties that make it an extraordinary compound. However, some properties are not applicable to water, and one of them is the density increases when frozen.

Other properties of water and how they affect life on earth are as follows.

1. It is a universal solvent: Water is known as a universal solvent because it can dissolve many substances like salt, sugar, and other chemicals. It has a high dielectric constant, making it an excellent solvent for many ionic compounds. Water molecules have polarity, and they attract other charged ions and dissolve them.

2. Stabilizes temperature: Water has a high specific heat capacity, which means it can absorb heat without changing its temperature. This property helps to stabilize the temperature of the oceans and other water bodies. Water can also release heat and cool the environment when it evaporates. This property helps to regulate the temperature of the earth's surface.

3. Cohesive: Water molecules have hydrogen bonds between them, making them cohesive. Cohesion is a property that makes the water molecules stick together. This property is responsible for capillary action in plants and water transportation in animals. The cohesive force of water is also responsible for the surface tension of water, which allows insects to walk on the water's surface.

4. Density increases when frozen: Water is an exception to the typical behavior of most compounds that contract when cooled. Water expands when cooled below its freezing point and becomes less dense. This behavior is a unique property of water and is responsible for the survival of aquatic life during winter.

Therefore, the property of water that is not applicable to water is the density increases when frozen.

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After doing the paper chromatography the pigments are separated at different levels, these are carotene,  green chlorophyll etc.

The lipstick obtained from the bad scene is subjected to paper chromatography and a chromatogram is then obtained. Lipstick is having many coloured pigments as the active ingredients. So this active ingredients separate at different rate depending upon its partition coefficient. The obtained chromatogram is considered as standard and the it's RF values are calculated. Rf values are nothing but the dividing the distance travelled by the solute by the distance travelled by solvent front. The obtained are values are then noted.

The plants consist of different coloured pigments. The primary function of the colour pigments is to absorb maximum frequencies of light and also they can reflect the same. The pigments play their role during the process of of photosynthesis which requires the presence of sunlight. The required amount of light is absorbed by this colour pigments typically the green chlorophyll and several other pigments. These coloured pigments are known as the biological pigments.

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The equivalency solution has a pH of 2.624.

Nitrous acid is frequently created by adding a mineral acid to aqueous sodium nitrite solutions. Typically, acidification is carried out at ice-cold temperatures, and HNO2 is consumed on-site. Nitrous acid in its free form is unstable and breaks down quickly.

In a neutralization process, weak nitrous acid (HNO2) reacts with strong basic KOH.

HNO2 + KOH → KNO2 + H2O

Then, we determine how many moles of KOH were used:

volume KOH x concentration equals moles KOH. KOH

moles KOH = 0.190 L x 0.377 mol/L

moles KOH = 0.07153 mol

Next, we calculate the initial concentration of HNO2:

concentration HNO2 = moles HNO2 / volume HNO2

concentration HNO2 = 0.07153 mol / 0.190 L

concentration HNO2 = 0.3765 M

[HNO2] = 0.5 x 0.3765 M

[HNO2] = 0.1883 M

The following equation can be used to model how nitrous acid dissociates in water:

HNO2 + H2O ⇌ H3O+ + NO2-

The following equation relates the pKa to the acid dissociation constant, Ka, for this reaction:

pKa = -log Ka

So we can find the Ka value from the given pKa:

pKa = -log Ka

3.35 = -log Ka

Ka = 10⁻³

Ka = 4.47 x 10⁻⁴

The relationship shown below is true for the concentrations of the species involved at equilibrium:

Ka = [H3O+][NO2-] / [HNO2]

Ka = [H3O+][NO2-] / [HNO2]

Ka = [H3O+] [HNO2]

Solving for [H3O+], we get:

[H3O+] = Ka / [HNO2]

[H3O+] = (4.47 x 10⁻⁴) / (0.1883 M)

[H3O+] = 0.002374 M

Finally, we can calculate the pH of the solution:

pH = -log[H3O+]

pH = -log(0.002374)

pH = 2.624

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Answer:

2.58×10^6

Explanation:

1.20×2.152

=2.5824×10^6

Explanation:

When a metal is heated the kinetic energy in the particles increases and hence the force of attraction decreases amongst the particles - as electrons try to escape due to kinetic energy. This causes the metal to expand.

It appears that the straw in the glass of water is bent or refracted at the water-air interface. This is a result of the phenomenon known as refraction. Refraction occurs when light travels from one medium to another with a different optical density, causing the light rays to change direction.

Based on the provided image from BrainPOP Science, it appears that the straw in the glass of water is bent or refracted at the water-air interface. This is a result of the phenomenon known as refraction. Refraction occurs when light travels from one medium to another with a different optical density, causing the light rays to change direction.

In this case, as the light passes from the water to the air, it undergoes refraction because the speed of light is different in water compared to air. The change in speed causes the light rays to bend as they cross the water-air boundary. This bending of light is what makes the straw appear bent or displaced when viewed through the glass of water.

The phenomenon of refraction is a common optical effect and can be observed in various situations where light passes through different mediums with varying optical properties.

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Explanation:

The difference in degrees Fahrenheit between the maximum expected temperatures by the end of the century between the lower and higher emissions scenarios can vary depending on various factors and assumptions.

However, in general, the lower emissions scenario is expected to result in a lower increase in global temperatures compared to the higher emissions scenario.

This means that the maximum expected temperature rise by the end of the century under the lower emissions scenario would be lower than that of the higher emissions scenario.

The specific temperature difference would depend on the specific projections and models used, but it highlights the significant impact that emissions reductions can have on mitigating future temperature increases.

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Answer:

Like protons, neutrons are bound into the atom's nucleus as a result of the strong nuclear force.

Explanation:

To determine the molar concentration of the H2SO4(aq) solution, we need to use the relationship between molality, molar mass, and density.

Molarity = (molality * molar mass) / density

Given that the molality is 2.55 and the density is 1.151 g/ml, we need to find the molar mass of H2SO4.

(2 * atomic mass of hydrogen) + atomic mass of sulfur + (4 * atomic mass of oxygen)

(2 * 1.008 g/mol) + 32.06 g/mol + (4 * 16.00 g/mol) = 98.09 g/mol

Now, we can substitute the values into the molarity formula:

Molarity = (2.55 mol/kg * 98.09 g/mol) / 1.151 g/ml

Converting the mol/kg to mol/L:

Molarity = (2.55 * 1000 mol/L * 98.09 g/mol) / 1.151 g/ml

Simplifying:

Molarity ≈ 213.53 mol/L

Therefore, the molar concentration of the H2SO4(aq) solution is approximately 213.53 mol/L.

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Plants use carbon to build leaves and stems, which are then digested and used for cellular growth by animals. Carbon is stored in the atmosphere as gases such as carbon dioxide. It is also stored in the oceans, where it is captured by a variety of marine organisms.

A heterotroph is an organism that, unlike an autotroph, cannot fix carbon and instead grows on organic carbon.

Carbon dioxide is pulled from the air by photosynthesis to produce carbon-based food for plant growth. Carbon is transferred from plants to animals.

Carbon from plants moves through food chains to the animals that eat them. Animals that eat other animals absorb carbon from their food as well.

Thus, Organic molecules produced by photosynthesizes are consumed by food chains, and cellular respiration converts the organic carbon back into carbon dioxide gas.

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Answer:

Whether they're powered by coal, gas, nuclear power, or geothermal energy, all power plants have one thing in common: they convert heat to electricity. Drilling water or steam wells, analogous to drilling for oil, is used to obtain heat from the Earth, or geothermal — Geo (Earth) + thermal (heat) — energy.

Explanation:

If you use the molecular orbital theory, option C, which is the paramagnetism of oxygen particles, you can explain the odd thing that Lewis structures can't explain.

The fact that oxygen particles are paramagnetic doesn't make sense in terms of Lewis structure. Since oxygen atoms have two electrons that don't have a partner, only molecular orbital theory can explain why oxygen particles are paramagnets. A Lewis structure is a much better way to show how the electrons in a particle's valence shell are arranged. It is used to show how the electrons around the different atoms in a particle are arranged. Electrons are shown as "dabs" or as a line running between two particles. In his cubical particle hypothesis, Lewis came up with the "octet rule." The octet rule is based on the fact that iotas tend to like having eight electrons in their valence shell. When molecules have fewer than eight electrons, they usually react by making more stable mixtures. Atoms will act to get into the most stable state possible.

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The law of conservation of mass states that in a chemical reaction, the total mass of the reactants is equal to the total mass of the products.

This means that matter cannot be created or destroyed during a chemical reaction; it can only be rearranged from the reactants to the products. In other words, the mass of the reactants is conserved and is equal to the mass of the products in a chemical reaction.

This fundamental law of chemistry is a consequence of the principle of the conservation of energy, which states that energy cannot be created or destroyed, only transformed from one form to another.

The law of conservation of mass is a cornerstone of chemical equations and plays a critical role in understanding and predicting chemical reactions.

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The complete question is :

What does the law of Conservation of Mass states ?

Answer:

Only one side of the spherical Moon is ever visible from Earth it wasn't until 1959 when the Soviet Spacecraft Luna 3 orbited the Moon and sent pictures home that human beings were able to see the "far side" of the Moon for the first time. A phenomenon called tidal locking is responsible for the consistent view

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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Raising the temperature of the reaction would likely cause the greatest increase in the rate of the reaction between C2H4 and H2.

To determine which change would likely cause the greatest increase in the rate of the reaction, we need to consider the factors that affect reaction rate. These factors include concentration, temperature, surface area, and the presence of a catalyst.

In this case, the reaction is the conversion of ethene (C2H4) and hydrogen gas (H2) to form ethane (C2H6). One change that could potentially increase the rate of this reaction is increasing the concentration of reactants. When the concentration of reactants is increased, there are more particles available for collisions, which can lead to more successful collisions and an increased reaction rate.

Another change that could potentially increase the reaction rate is raising the temperature. Increasing the temperature generally increases the kinetic energy of the particles, causing them to move faster and collide more frequently. This can result in more successful collisions and a faster reaction rate.

However,  the answer would be raising the temperature. Increasing the temperature typically has a larger effect on reaction rate compared to increasing the concentration of reactants.

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Answer:a= 0.49411764705882 m/s^2

Explication

Because of the formula a= f/m we had to divide the force with the mass to get the acceleration

To find the resulting acceleration of the object, you can use Newton's second law of motion, which states that the acceleration of an object is directly proportional to the force applied to it and inversely proportional to its mass. The resulting acceleration of the object is approximately 0.494 \(ms^{2}\).

Mathematically, this law is represented as F=m⋅a

Where:

F is the force applied to the object (42 N in this case).

m is the mass of the object (85 kg in this case).

a is the acceleration of the object (what we're trying to find).

Rearranging the formula to solve for acceleration:

\(a=\frac{f}{m}\)

​Plugging in the given values:

\(a= \frac{42N}{85kg} \\=0.494 ms{2}\)

So, the resulting acceleration of the object is approximately 0.494 \(ms^{2}\)

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The indication written identify the new substance is formed in a chemical reaction.

A chemical reaction happens when substances break down or combine to form a one or more new substances. the substance take part in a chemical reaction initially called as reactants and the substance forms at the end of the chemical reaction is called as products.

The sign or indications of new substance is formed are:

The phase change is not consider as the chemical change.

Thus, The indication written identify the new substance is formed in a chemical reaction.

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Answer:

In a periodic table the average atomic mass of magnesium is given as 24.312 u.

To find all the stationary solutions of a system, we need to solve for when the derivatives of all the variables are equal to zero. In other words, we need to find the points where the system is not changing, or is "stationary".

To do this, we first need to set up the system and its derivatives. Then, we need to solve for when all the derivatives are equal to zero. This will give us the values of the variables at the stationary points.

Once we have the values of the variables at the stationary points, we can analyze their stability. To do this, we need to look at the behavior of the system near the stationary points. We can use linearization or phase plane analysis to determine if the stationary points are stable, unstable, or semi-stable.

Overall, finding all the stationary solutions of a system is an important step in understanding its behavior and stability. It allows us to predict the long-term behavior of the system and make informed decisions about how to manipulate or control it.

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