How much heat energy is released when 8 grams of hydrogen are burned? the thermal equation is 2h2(g) o2(g) → 2h2o(g) 483.6 kj.

If the original volume is doubled at constant temperature, the pressure would reduce by half. Therefore, the correct option is option B.

The force delivered perpendicularly to an object's surface per unit area across how that force is dispersed is known as pressure. The pressure as compared to the surrounding air is known as gauge pressure (445). Pressure is expressed using a variety of units. Some of these are calculated by dividing a unit of force by a unit of area; for instance, the standard international unit of stress, the pascal (Pa), is equal to one newton every square metre (N/m2). If the original volume is doubled at constant temperature, the pressure would reduce by half.

Therefore, the correct option is option B.

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The famous formula E=mc^2 really says that mass and energy are the same thing, but measured in different units. So the separate laws of conservation- one for mass and the other for energy- are now merged into one law.

Einstein's theory of special relativity (1905) shows that matter (as mass) and energy can be converted into each other according to the famous equation E = mc2, where E is energy, m is mass, and c is the speed of light.

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If a sodium citrate sample for coagulation is noted to be filled an inch below the fill line, then the specimen is considered unacceptable for coagulation studies. It alters the properties of blood.

Blood coagulation (clotting) is a natural process by which blood cells form a gel known as a blood clot.

The blood clot generates a protective barrier against the entry of harmful substances inside the body.

Sodium citrate can be used in coagulation studies because blood factors V and VIII are relatively more stable in media that contain this substance.

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Answer:

it helps prove the fact or opinion and test that and archive it

Answer:

reaction to cold pack: change in temperature

Evidence of a chemical reaction etc is change in composition

Explanation: composition is atoms changeing and etc, which is a chemical reacton i think. Change in temperture is alsoa  chemical reaction but cold packs

Answer:

Cold pack: absorbs heat (endothermic reaction)

Hot pack: releases heat ( exothermic reaction)

Explanation:

when a cold pack/hot pack is shaken, water mixes with the chemicals in the outer layer and reacts to release or absorb heat.

Answer: energy is transferred through vibration of air particles or particles of a solid through which the sound travels.

Answer:

Sound is transmitted by vibrating a object and the waves move through particles.

Explanation:

Answer:

8306.76

Explanation:

you just calcuate 8.12 x 1023 and that will give you the answer

The set B gives the set of particles that experience stronger attraction because the charges are greater. Therefore, option B is correct.

Electric charge is the physical property of matter. Charges makes to experience a force when placed in an electromagnetic field.

Positive and negative electric charges are the two types of charges commonly transported by charge carriers, protons and electrons. Energy is make up by the movement of charges.

In set B there are +4 and -4 two charges are present so, they give stronger attraction that set A.

Thus, option B is correct.

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When 1-propanol is exposed to SOCl2, followed by magnesium, then a 2-carbon aldehyde, and then aqueous workup, the resulting product is 2-methyl-2-propanol.

This reaction is known as the Grignard reaction, and is an important reaction in organic synthesis. It involves the addition of an organometallic reagent, such as RMgX (where R is an organic group and X is a halogen), to a carbonyl group. In this case, the 2-carbon aldehyde is the carbonyl group and the R group is the 1-propanol.

The reaction is followed by aqueous workup, which involves treating the reaction mixture with aqueous acid to hydrolyze the product.

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Answer: The earth's atmosphere gets thinner with the increase in altitude. The earth's atmospheric layers are Troposphere, Stratosphere, Mesosphere, Ionosphere .

Explanation:

Good luck!

The ion is sodium ion.

An ion is obtained by the removal of an electron from an atom. An ion could be positively charged or negatively charged. If the ion contains more electrons than protons then it is positively charged and vice versa.

An ion is positive when electrons are lost and the ion is negative when electrons are gained. In a negative charge, the electron cloud spreads out and the ion becomes larger. When we have a positive ion, the ion is smaller than the neutral atom.

Now, we can see that neon has an atomic number of 20 thus it has 10 electrons. If the ion contains one more proton then the atomic number of the element is 11. We are told that it contains two more neutrons hence the mass number is 22.

Given that the both species have the same number of electrons thus the ion must be sodium ion.

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The approximate balance in the account at the end of 6 years is $159,074. Rounded to the nearest dollar, it is $159,074.

Assuming that the annual rate of $20,000 is deposited at the beginning of each year, the total amount deposited over 6 years would be $120,000. With continuous compounding at 5% interest rate, the formula to calculate the balance in the account after 6 years is:
A = Pe^(rt)
Where A is the balance, P is the principal (amount deposited), e is the mathematical constant approximately equal to 2.71828, r is the interest rate in decimal form, and t is the time in years.
Plugging in the values, we get:
A = $120,000e^(0.05*6)
A = $159,073.51
Therefore, the approximate balance in the account at the end of 6 years is $159,074. Rounded to the nearest dollar, it is $159,074.

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Answer:

Since salt ions are heavier than water molecules, seawater is denser than freshwater. The density of seawater ranges from 1020 to 1030 kg/m 3 while the density of freshwater is about 1000 kg/m 3. Variations in salinity also cause the freezing point of seawater to be somewhat lower than that of freshwater.

Explanation:

Answer:

C: petal

D:stamen

Answer:

Pistil

sepal

petal

stamen

1:1 clays and oxides of Fe and Al usually form in low pH and low ionic strength conditions, while minerals like smectite usually form in high pH and high ionic strength conditions.


Clays and oxides are formed under different environmental conditions. The formation of 1:1 clays and oxides of Fe and Al is favored in low pH and low ionic strength conditions. The low pH leads to an increase in the solubility of aluminum and iron and their oxides, and 1:1 clay minerals form due to the dominant linkages between the aluminum and the oxygen ions in the octahedral and tetrahedral sheets.

Similarly, under low ionic strength conditions, the solubility of the minerals of iron and aluminum increases, leading to the formation of oxides of Fe and Al. Minerals like smectite usually form under high pH and high ionic strength conditions. The high pH conditions promote hydrolysis, while high ionic strength conditions favor cation exchange reactions. These conditions result in the formation of smectite and other minerals with 2:1 layer arrangements.

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Answer:the second largest one

Explanation:

both weels are pushing at it

Stereoisomerism and structural isomerism are the two basic types of isomerism (spatial isomerism). Structural isomers are isomers that differ in structure or kind of bond and have the same number of atoms of each kind but differ in how those atoms are connected to one another. Isomer types often fall into two categories.

Constitutional isomerism are molecules with varying connections, similar to how red and green beads are arranged differently in simple bracelets. Stereoisomers are the second category. Stereoisomers have identical connectivity, but their component pieces are arranged differently in space.

The two primary types of isomerism are stereoisomerism, also known as spatial isomerism, and structural isomerism.

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Answer:

3.38 moles of O2.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

4CH2OH + 5O2 → 4CO2 + 6H2O

From the balanced equation above,

4 moles of CH2OH required 5 moles of O2 for complete combustion.

Finally, we shall determine the number of mole of O2 needed to react with 2.7 moles of CH2OH. This can be obtained as follow:

From the balanced equation above,

4 moles of CH2OH required 5 moles of O2 for complete combustion.

Therefore, 2.7 moles of CH2OH will require = (2.7 × 5)/4 = 3.38 moles of O2 for complete combustion.

Thus, 3.38 moles of O2 is required.

Answer: 16.7 KJ of heat

Explanation:

The heat required to melt the popsicle can be calculated using the equation:

q = nΔH

where q is the heat required, n is the number of moles of the substance being melted, and ΔH is the enthalpy of fusion.

To find the number of moles of the popsicle, we need to divide the mass by the molar mass:

n = m/M

where m is the mass of the popsicle and M is the molar mass. Since the popsicle has the same molar mass as water (18.0 g/mol), we have:

n = 50.0 g / 18.0 g/mol = 2.78 mol

The enthalpy of fusion of water is 6.01 kJ/mol, so we can calculate the heat required as:

q = nΔH = 2.78 mol x 6.01 kJ/mol = 16.7 kJ

Therefore, 16.7 kJ of heat are required to melt a 50.0-g popsicle at 0°C.

Answer:

1x10^–9 M

Explanation:

From the question given,

Concentration of hydronium ion, [H3O+] = 1x10^-5 M.

Concentration of Hydroxide ion, [OH-] =..?

The concentration of the hydroxide ion, [OH-] can be obtained as follow:

[H3O+] x [OH-] = 1x10^–14

1x10^-5 M x [OH-] = 1x10^–14

Divide both side by 1x10^-5

[OH-] = 1x10^–14 / 1x10^-5

[OH-] = 1x10^–9 M

The  [OH⁻] concentration of the solution is  1 * 10⁻⁹M.

pH value is the measure of the acidity and alkalinity of a solution , The pH value has the range of 0 to 14, where 0-7 is the range for acid , 7 is for neutral solution , 7-14 is for alkaline solution.

[H3O⁺] = 1* 10⁻⁵ M

We can calculate the value of OH⁻ concentration  by using the formula

[H⁺][OH⁻] = 1* 10⁻¹⁴

1* 10⁻⁵  * [OH⁻] = 1* 10⁻¹⁴

[OH⁻] = 1 * 10⁻⁹

Therefore the  [OH⁻] concentration is  1 * 10⁻⁹M .

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Answer: Light

Explanation:

The environment abiotic factors like sunlight, water, air, and soil are important for the growth of the plants. A wildflowers is a plant that grows in wild. It was not intentionally seeded or planted.

The light is one of the important environmental factor. As the wildflowers are blooming earlier than the large trees. Thus the wildflowers are receiving the light earlier than large trees.

Answer

449.4 grams

Explanation

The balanced chemical equation of the reaction is;

From the balanced chemical equation;

3 moles of H₂ reacted with 1 mole of N₂ to produce 2 moles of NH₃

Molar mass of H₂ = 2.016 g/mol

Molar mass of N₂ = 28.0134 g/mol

Molar mass of NH₃ = 17.031 g/mol

Convert mole to gram using the formula;

For 1 mole N₂

For 3 moles H₂

For 2 moles NH₃

We can now calculate, the mass of NH₃ that can be produced from 79.8 grams of H₂ as follows:

From the balanced equation we can say;

6.048 grams H₂ → 34.062 grams NH₃

∴ 79.8 grams H₂ → x grams NH₃

Therefore, 449.4 grams of Ammonia is produced if you started with 79.8 grams of Hydrogen.

Answer:

4

Explanation: on the left side of the equation there are 4 carbons, to make 4 carbons on the right side of the equation you need 4 of the CO2 molecules.

The tiny unit of an element that retains the properties of the element is called an atom.

Atoms are the basic building blocks of matter and are composed of a nucleus, which contains positively charged protons and neutral neutrons, surrounded by negatively charged electrons that orbit the nucleus. The unique arrangement of protons, neutrons, and electrons in an atom determines its chemical and physical properties, such as its atomic number, mass, and reactivity.Atoms are incredibly small and are typically measured in units of picometers or angstroms.

Each element is defined by the number of protons in its atomic nucleus, which is known as its atomic number. For example, carbon atoms have six protons in their nucleus, while oxygen atoms have eight protons. The number of neutrons in an atom's nucleus can vary, resulting in isotopes of the same element with different atomic masses.

Atoms can combine with other atoms to form molecules and compounds through chemical bonds, including covalent bonds, ionic bonds, and metallic bonds.

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A gas has a capacity of 34 litres and a temp of 35°C, when it once had a quantity of 28, a temperature of 45°A, and an unknown pressure.

A pressure unit is what?

The Metric unit of pressure, the pascal (abbreviated as Pa), is equal to one thomas per sq meter (Y e or kg m-1s-2). Surprisingly, this name was chosen in 1971.

How is pressure measured?

P = F / A, or force per unit of surface area, is the formula for computing pressure. The sign for pressures in physical science is p, and the SI-derived unit for measuring pressure is the pascal (symbol: Pa). One pascal is equal to one Newton per square meter of force applied perpendicularly on a surface.

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Jeff can conclude that the specific heat capacity of water is higher than that of vegetable oil. This has practical implications in many fields, such as cooking, where the specific heat capacity of different ingredients can affect cooking times and temperatures.

Jeff's experiment shows that the vegetable oil has a lower specific heat capacity than water. Specific heat capacity is the amount of heat energy required to raise the temperature of a substance by one degree Celsius. In this case, the oil's temperature increased more than the water's temperature after being heated for the same amount of time, which means the oil required less heat energy than water to increase its temperature by the same amount. This difference in specific heat capacity is due to the molecular structure of water and vegetable oil. Water has a high specific heat capacity because it has strong hydrogen bonds between its molecules, which require a lot of energy to break. Vegetable oil, on the other hand, is made up of long chains of hydrocarbons that do not have strong intermolecular forces, so they require less energy to be heated.

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The product obtained from the oxidation of cis-2-methyl cyclohexanol with NaOCl is 2-methyl cyclohexanone, along with sodium chloride and water as byproducts.

Oxidation is a chemical process that involves the loss of electrons or the gain of oxygen atoms by a substance. It is a fundamental concept in chemistry and plays a critical role in many chemical reactions. In oxidation, the oxidizing agent (often oxygen) accepts electrons from the reducing agent, which loses electrons. As a result of this transfer of electrons, the reducing agent is oxidized, and the oxidizing agent is reduced.

One of the most well-known examples of oxidation is rusting, in which iron reacts with oxygen to form iron oxide. Combustion reactions, such as the burning of fuels, also involve oxidation. Oxidation can be used in many industrial applications, such as in the production of chemicals, as well as in biological systems, such as the breakdown of food for energy.

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Answer:

Option 2 and 4 are correct

Explanation:

The reactants in the attached image have more enthalpy and hence less stability as they are more reactive. Thus, Product is more stable than the reactants.

This is an addition reaction in which two reactants add up to form the product.

Very less activation energy is required as the reactants themselves are unstable, possess high energy and hence are very reactive.

Reactants have more energy than the products.