An experiment requires a solution of 60 % ethanol by volume. What volume of alcohol should be added to make a 200 mL of this solution?​

Answer:

True

Explanation:

An orbital is is the space occupied by a pair of electrons. The maximum number of electrons in an orbital is 2.

The maximum number of electrons in in the orbitals are two.

For s-sublevel with one orbital we have two electrons

      p-sublevel with three orbitals we have six electrons

      d - sublevel with five orbitals we have ten electrons

     f - sublevel with seven orbitals we have fourteen electrons

Each orbital can take a maximum of two electrons.

Sure, here is a brief explanation of the difference between atoms, molecules, compounds, and mixtures in chemistry:

Atoms are the smallest unit of an element that can exist. They are made up of protons, neutrons, and electrons.

Molecules are groups of two or more atoms that are chemically bonded together. The atoms in a molecule can be of the same element, like in oxygen (O2), or of different elements, like in water (H2O).

Compounds are substances that are made up of two or more elements that are chemically combined. Compounds have a fixed composition, meaning that they always contain the same elements in the same proportions.

Mixtures are substances that are made up of two or more substances that are not chemically combined. The components of a mixture can be separated by physical means, like filtration or distillation.

Here is a table that summarizes the key differences between atoms, molecules, compounds, and mixtures:

| Property | Atom | Molecule | Compound | Mixture |

|---|---|---|---|---|

| Composition | Single element | Same element or different elements | Two or more elements | Two or more substances |

| Bonding | Not bonded | Chemically bonded | Chemically bonded | Not chemically bonded |

| Separation | Not possible | Not possible | Possible | Possible |

| Properties | Same as element | Same as elements or different | Different from elements | Same or different from components |

I hope this helps! Let me know if you have any other questions.

The correct answer is C. ΔHθf

We define the standard enthalpy of formation as the enthalpy change when one mole of a substance is formed from its elements under standard conditions. The standard conditions are 1 atm pressure, 273 K temperature and 1 M concentration.

The standard enthalpy of formation is denoted using the symbol ΔHθf.

Hence, ΔHθf is the enthalpy change when 1 mole of a substance is formed from its elements under standard conditions.

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Explanation:

CH3COOH + Mg --> Mg(CH3COO)2 + H2

CH3COOH + MgO --> H2O + Mg(CH3COO)2

CH3COOH + Mg(OH)2 --> H2O + (CH3COO)2Mg

CH3COOH + MgCO3 --> (CH3COO)2Mg + CO2 + H2O.

*equations are not balanced.

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Answer:

Mexico

Explanation:

The top five countries with the largest proven coal reserves

Mexico isn't on this list

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The correct increasing order of solubility for the given gases is: NH₃ < N₂ < CO₂

A chemical's solubility is the maximum amount of that substance that will dissolve in a specific amount of solvent at a specific temperature. Solubility has several practical applications, including water filtering, beverage manufacturing, and vitamin storage.

The ability of a medicine to dissolve is essential to its effectiveness. A drug substance could be absorbed without it, which results in limited bioavailability. Drugs with poor solubility can potentially cause problems with metabolism or permeability, interaction with other medications, or the requirement for prolonged drug release.

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Different Types of Clouds are  cumulus clouds, stratus clouds, wispy clouds, Cumulonimbus clouds.

Clouds are made up of water droplets or ice crystals that are suspended in the atmosphere. They come in many different shapes and sizes, and they can form under a variety of conditions. The type of cloud that forms is related to the temperature and humidity of the air, as well as the altitude at which the cloud is forming.

One type of cloud is the cumulus clouds, which are large, fluffy clouds that often resemble cotton balls. They are formed when warm, moist air rises and cools, causing the water vapor to condense into water droplets. Cumulus clouds are typically found at lower altitudes, and they often indicate fair weather.

Another type of cloud is the stratus clouds, which are flat and featureless clouds that often cover the entire sky. They are formed when a layer of cool, moist air is trapped near the ground by a layer of warm air. Stratus clouds are typically found at lower altitudes, and they often indicate overcast or foggy weather.

Cirrus clouds are thin, wispy clouds that are formed when the air is very cold and dry. They are found at high altitudes, and they often indicate the approach of a storm.

Cumulonimbus clouds are large, towering clouds that can reach great heights and they are often associated with thunderstorms. They are formed when warm, moist air rises quickly and cools, causing the water vapor to condense into water droplets and ice crystals.

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Answer:

It is a force of attraction that holds the atoms/ions with each other to form a molecule or between the molecules to form a substance.

Explanation:

The chemical bond can be thought of as a force that holds the atoms of various elements together in such compounds.

To find the mole fraction of NH3 in the solution, we need to first calculate the total mass of the solution:

Total mass = mass of NH3 + mass of water
Total mass = 15.0 g + 250.0 g
Total mass = 265.0 g

Next, we can calculate the volume of the solution using the density:

Density = mass/volume
Volume = mass/density
Volume = 265.0 g/0.974 g/mL
Volume = 271.82 mL

Now, we can use the volume and concentration of NH3 to calculate the amount of moles of NH3 in the solution:

Concentration = mass/volume
Concentration of NH3 = 15.0 g/271.82 mL
Concentration of NH3 = 0.055 mol/mL

To find the mole fraction of NH3 in the solution, we need to divide the moles of NH3 by the total moles of the solution:

Mole fraction of NH3 = moles of NH3 / total moles
Total moles = (mass of NH3/molar mass of NH3) + (mass of water/molar mass of water)
Total moles = (15.0 g/17.03 g/mol) + (250.0 g/18.02 g/mol)
Total moles = 0.881 mol + 13.871 mol
Total moles = 14.752 mol

Mole fraction of NH3 = 0.055 mol/mL / 14.752 mol
Mole fraction of NH3 = 0.003729

Therefore, the mole fraction of NH3 in the solution is 0.003729.

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Answer:

Atoms are made up of a nucleus, protons and electrons. Atoms are the basic units of matter and the defining structure of elements. The term "atom" comes from the Greek word for indivisible, because it was once thought that atoms were the smallest things in the universe and could not be divided.

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Outgoing shortwave radiation depends on factors such as the angle of the Sun's rays, albedo, cloud cover, and atmospheric gases. These factors collectively determine the amount of solar radiation that is reflected, absorbed, and re-emitted by the Earth's surface, influencing the outgoing shortwave radiation.

Outgoing shortwave radiation depends on several factors. Firstly, it is influenced by the solar radiation received by the Earth's surface. The amount of solar radiation reaching the Earth is determined by the angle of the Sun's rays, which changes throughout the day and across different seasons. This means that outgoing shortwave radiation will vary depending on the time of day and the time of year.

Another important factor is the albedo, which refers to the reflectivity of different surfaces on Earth. Surfaces with high albedo, such as ice and snow, reflect more solar radiation back into space, resulting in lower outgoing shortwave radiation. Conversely, surfaces with low albedo, such as dark soil and vegetation, absorb more solar radiation, leading to higher outgoing shortwave radiation.

The presence of clouds also plays a role in outgoing shortwave radiation. Clouds can either reflect incoming solar radiation back into space or absorb and re-emit it as longwave radiation. The type and thickness of clouds, as well as their altitude, can affect the amount of outgoing shortwave radiation.

Finally, atmospheric gases such as water vapor, carbon dioxide, and ozone can also influence outgoing shortwave radiation. These gases absorb and re-emit some of the incoming solar radiation, impacting the amount of radiation that escapes back into space.

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Answer:  a. 0.8 tons p. month.

Explanation:

Given: Total nuclear waste = 60,000 metric tons

Time take = 60 years = 12 x 60 months   [ 1 year = 12 months]

=  720 months

Total nuclear power plants = 104

Now , Average  waste produced by each plant = \(\dfrac{\text{Total waste}}{\text{Time x Number of plants}}\)

\(=\dfrac{60000}{720\times104}\approx0.8\text{ tons per month.}\)

Hence, 0.8 tons p. month is produced by each plant.

So, option a. is correct.

Answer:

A on edge 2021

Explanation:

Answer:

weight of hydrogen÷eq weight of hydrogen=weight of metal÷equivalent weight of metal

yo formula lagayera nikalne

yesma pressure ko kei kaam hunna

Answer:

Hii,kusha

ek problem hó rahi hai mujhe

Answer:

-

They move faster than molecules of a liquid or gas

They move faster than molecules of a liquid or gas and have no attraction to each other. So, the correct options are (B) and (D).

A gas is defined as a sample of matter which conforms to the shape of a container in which it is placed and attains a uniform density inside the container, even in the presence of gravity and regardless of the amount of substance in the container.

This is type of fluid like air which has neither independent shape nor volume but tends to expand indefinitely.

Gases have certain properties like

1. Easy to compress

2. Expand to fill the containers

3. Occupy much more space than the liquid or solid materials from which they are made.

Thus, they move faster than molecules of a liquid or gas and have no attraction to each other. So, the correct options are (B) and (D).

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To determine the empirical formula, we need to find the simplest whole-number ratio of atoms in the compound.

First, we find the total number of atoms in one molecule of the compound:

16 carbon atoms + 20 hydrogen atoms + 4 oxygen atoms + 0 nitrogen atoms = 40 atoms

Next, we divide each count by the greatest common factor to obtain the simplest whole-number ratio:

16 C atoms ÷ 4 = 4 C atoms

20 H atoms ÷ 4 = 5 H atoms

4 O atoms ÷ 4 = 1 O atom

0 N atoms ÷ 4 = 0 N atoms

Therefore, the empirical formula of the compound is C4H5O.

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The difference between electric current and resistance is given below:

Electric Current

Resistance

An electric current is formed when a conducting path is created to allow electric charge to continuously move. Electrical resistance is directly proportional to length (L) of the conductor and inversely proportional to the cross-sectional area (A).        

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Answer:

Ionic Bonds are formed from metal to nonmetals. Covalent Bonds usually form from nonmetals.

Explanation:

Answer:

C

Explanation:

USA Test prep

The aluminum metal has atoms with greater attraction than the atoms in nitrogen gas. Hence option C is correct.

Metals are defined as a substance that appears shiny when freshly manufactured, polished, or broken, and conducts electricity and heat rather well. A metal element is an element with metallic bonding and positive ions. The periodic table contains mostly metals. The earth's crust is where most pure metals are found. The majority of the planet's iron mass, which makes up over a third of its mass, is located in its core.

Under a specific set of circumstances, a substance's state of matter is controlled by its molecular qualities rather than the other way around. While relatively weak intermolecular interactions promote the gaseous state, strong intermolecular forces favor a condensed form of matter (liquid or solid).

Thus, the aluminum metal has atoms with greater attraction than the atoms in nitrogen gas. Hence option C is correct.

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Answer:

A is its answer

Explanation:

Fan uses electrical energy and makes it to mechanical energy by rotating

Same is with the drill

Trampoline does not use electrical energy

Lamp uses electrical energy but it converts it into light energy and heat energy

So A is the answer

If 150cm³ of carbon(11) oxide burns in 80cm³of oxygen according to the given equation the volume of oxygen that was in excess is 5.6 cm³.

From the balanced equation, we can see that 2 moles of CO react with 1 mole of O2. Therefore, we need to determine how much O2 is required to react with 150 cm³ of CO.

Let's start by calculating the number of moles of CO:

n(CO) = V(CO) / molar volume at STP

= 150 cm³ / 22.4 L/mol

= 0.006696 mol

Since the stoichiometric ratio of equation of CO to O2 is 2:1, we need half as many moles of O2 as CO. Therefore, the number of moles of O2 required is:

n(O2) = 1/2 * n(CO)

= 1/2 * 0.006696 mol

= 0.003348 mol

Now we can calculate the volume of oxygen required using the ideal gas law:

PV = nRT

Assuming the temperature and pressure are constant, we can simplify this to:

V = n(RT/P)

where V is the volume of gas in liters, n is the number of moles of gas, R is the ideal gas constant, T is the temperature in Kelvin, and P is the pressure in atmospheres.

At STP, the temperature is 273 K and the pressure is 1 atm. Therefore:

V(O2) = n(O2)(RT/P)

= 0.003348 mol * (0.0821 L·atm/mol·K * 273 K / 1 atm)

= 0.0744 L

= 74.4 cm³

So the volume of oxygen required to react with 150 cm³ of CO is 74.4 cm³. Since the initial volume of O2 was 80 cm³, the volume of O2 in excess is:

V(excess) = V(initial) - V(required)

= 80 cm³ - 74.4 cm³

= 5.6 cm³

Therefore, the volume of oxygen that was in excess is 5.6 cm³.

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Answer:

mixture in which the composition is uniform throughout the

Explanation:

Components found in most energy drinks include stimulants like caffeine and citicoline, food additives, vitamins, and nutrient macromolecules.

Energy drinks are drinks that are marketed as providing mental and physical stimulation, as well as increased stamina. Caffeine, taurine, ginseng, vitamins, and various forms of sugar are often present in energy drinks. There are a few substances in energy drinks that are commonly found such as:

Stimulants: Energy drinks include several stimulants that are intended to increase alertness and energy levels. These stimulants are usually caffeine, taurine, and guarana extracts.

Nutrient Macromolecules: Energy drinks are often high in carbohydrate and amino acid levels. They are required for both metabolism and energy production.

Food Additives: Food additives, such as flavouring, sweeteners, preservatives, and artificial colours, are often found in energy drinks. These additives are not harmful to your health, but they can cause symptoms like stomach upset, headaches, and allergic reactions.

Vitamins: Energy drinks contain various vitamins, such as vitamins B6 and B12, which are essential for energy production and neurological function. However, consuming more vitamins than you require might lead to negative side effects.

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Answer:

You should follow these steps:

Count each type of atom in reactants and products.

Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances.

Repeat steps 1 and 2 until the equation is balanced.

Explanation:

Water has a 1 g/cm3 density. Weight of water in grammes when a bottle is completely filled with that amount of water.

Density bottle volume:

The empty density bottle weighs M1 = 4 kg.

Bottle weight plus water equals 12.5 kg Bottle weight plus water equals 12.5 kg Mass of water filling the density container to the top equals M2 — M1 (12.5—4=8.5 kg).

However, 1 g of water has a volume of 1 cc.

∴ water volume equals 8.5 cubic centimetres, or 8.5 ml, in a density bottle.

Define density.

The ratio between a substance's mass and volume is referred to as its density.

Volume/Mass = Density

The substance's mass per unit of volume is known as its density (volumetric mass density or specific mass). Although the Latin letter D may also be used, the sign most frequently used for density is (the lower case Greek letter rho). Mass divided by volume is the definition of density in mathematics: where is the density, m is the mass, and V is the volume.

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Star A will have blue color as hottest stars are blue in color.

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Answer:

Visible light waves

Explanation:

Visible light waves are the only electromagnetic waves we can see. We see these waves as the colors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength.

Answer:

Explanation:

2C4H10 (g) + 11O2(g) —> 8CO2 (g) + 6H2O (g)

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Answer:

2C4H10 + 2O2 ---> 8CO2 + 10H2O

Explanation:

The coefficients of the species shown when the equation n2 + Br- + N2H4 → N2 + Br- + NH3 are balanced properly under basic conditions are 1, 2, and 2 for N2, Br-, and N2H4, respectively.

To balance the equation, start by balancing the nitrogen atoms by placing a coefficient of 2 in front of N2 and N2H4. This gives the equation 2N2 + Br- + N2H4 → 2N2 + Br- + NH3. Next, balance the hydrogen atoms by placing a coefficient of 2 in front of NH3. The equation then becomes 2N2 + Br- + N2H4 → 2N2 + Br- + 2NH3. Finally, balance the charge by adding OH- to the reactants side of the equation.

The final balanced equation is 2N2H4 + 6OH- + Br- → 4NH3 + 2N2 + 3H2O + Br-. Therefore, the coefficients for the species shown are 1 for Br-, 1 for N2, and 2 for N2H4.

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ANSWER

The arrow will be shifted to the right (OPTION B)

EXPLANATION:

Firstly, we need to write out the chemical reaction equation

From the reaction above, you will see that heat is one of the products, this means that the reaction is n exothermic reaction.

An exothermic reaction is a type of reaction in which heat is released to its surroundings.

In an exothermic reaction, a decrease in temperature will shift the equilibrium to the right

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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