How much heat is released by the combustion of 2 mol of methane?
A.-80.3 kJ
B.-802.5 kJ
C.-1,605.1 kJ
D.-6,420.3 kJ

Answer:

the continents of earth were clustered together in formation that a scientist named Pangaea.

Explanation:

Before 300 million years ago, our earth was not made up of 7 different continent what we have now. Instead it was single huge mass land that was surrounded by a single ocean called  Panthalassa. A lot of  migration and collision lead to the formation of Pangaea. An Scientist named Albert Wegener gave the name Pangaea. Later, Pangaea was broken into  Gondwanaland and Laurasia.These Lands were then divided into 7 continents.

Answer:

Aquatic ecosystem has two components -

     2.Abiotic components

temperature and amount of sunlight are the part of abiotic component .

while living things like sponges and planktons are the biotic components of ecosystem.

Explanation:

aquatic components are of two types-

freshwater ecosystem( lakes and ponds, river and streams)

marine ecosystem(ocean ecosysyem, estuaries)

planktons-

planktons are found in limnetic zone, availability of sunlight is much here. planktons  are zooplanktons and phytoplanktons  are very important link in aquatic ecosystem.

sponges

In marine water, the benthic zone is the area below the pelagic zone. Here temperature decreased because of less light perception. This zone is very nutrient rich so organisms which are present here are- bacteria, fungi, sea anemone, sponges and some fishes.

Answer:  All of the given choices.

Explanation:

The ecosystem can be defined as the combination of the biotic and abiotic factors. The biotic factors consists of the living systems and the abiotic factors consists of the non living parts of the ecosystem.

The biotic part of the aquatic ecosystem is sponges and plankton. This is because they are living.

The abiotic part of the aquatic system consists of amount of sunlight ad temperature of water because they are non living.

Answer:

q = - 2067.2 J of Heat is giving out when 85.0g of lead cools from 200.0 c to 10.0 c.

Explanation:

The Specific Heat capacity of Lead is 0.128 [tex]\frac{J}{g\ ^{0}C}[/tex]

This means, increase in temperature of 1 gm of lead by [tex]1 ^{0}\ C[/tex] will require 0.128 J of heat.

Formula Used :

[tex]q = m.c.\Delta T[/tex]

q = amount of heat added / removed

m = mass of substance in grams = 85.0 g

c = specific heat of the substance = 0.128

[tex]q = m.c.\Delta T[/tex] = Change in temperature

                                          = final temperature - Initial temperature

                                          = 10 - 200

                                          = -[tex]190 ^{0}\ C[/tex]

put value in formula

q = -  [tex]85\times 0.128\times 190[/tex]

On calculation,

q = - 2067.2 J

- sign indicates that the heat is released in the process

Answer:

electrons

Explanation:

The orbitals are the spaces around the nucleus.

Neutrons and protons are in the nucleus of an atom, and the electrons revolve around the nucleus.

Answer:

See the explanation below, please.

Explanation:

Then the dissociation of the compound CaCl2 (Calcium chloride):

CaCl2 ---> Ca 2+ + 2Cl -

The compound dissociates into Ca2 + and Chloride (Cl-)

(two ions are generated in dissociation)

Answer:

The answer is 2 ions

Explanation:

Answer:

GN-z11 is the oldest

Explanation:

GN-z11 has a spectroscopic redshift of z = 11.09, which corresponds to a proper distance of approximately 32 billion light-years

Globular clusters are some of the oldest structures in the Milky Way, with ages suggesting the age of the universe to be at least around 11 to 13 billion years old. The Boomerang Nebula is among the youngest and coldest objects known. The study of distant galaxies and ancient globular clusters helps astronomers understand the early universe.

The oldest and farthest celestial bodies in the universe provide insight into the universe's early history. Globular clusters are among the oldest structures in our Galaxy, with the youngest being about 11 billion years old, setting a lower limit for the age of the universe. Our Milky Way, containing such ancient globular clusters, suggests it was born at least 13 billion years ago. One famous globular cluster, M13, is roughly 26,000 light-years away from us and has an estimated mass of around a million times that of the Sun. In contrast to these ancient objects, the Boomerang Nebula is a much younger planetary nebula and is currently the coldest known object in the Universe.

In order to understand the early universe, astronomers study not only globular clusters but also very distant galaxies, as they provide a view of the universe when it was very young. Observations of stars in the halo of the Milky Way, red giant stars, suggest distances of almost 1 million light-years, indicating the immense scale and diversity of structures within our galaxy.

Answer:

Charles' law states that the volume and temperature of a gas have a direct relationship: As temperature increases, volume increases, when pressure is held constant. Heating a gas increases the kinetic energy of the particles, causing the gas to expand.

Explanation:

Final answer:

If the temperature of a gas is increased while keeping the volume constant, the pressure will increase. If the temperature is decreased, the pressure will similarly decrease. This relationship is described by Gay-Lussac's Law.

Explanation:

When you change the temperature of a gas but keep the volume the same, according to Gay-Lussac's Law, the pressure of the gas changes directly with its absolute temperature. In other words, if you increase the temperature of the gas, the pressure will increase as well. Conversely, if you decrease the temperature, the pressure will decrease, as long as the volume is kept constant.

Temperature and Pressure Relationship

The relationship between temperature and pressure in a gas at constant volume is given by the equation P1/T1 = P2/T2, where P1 and P2 are the initial and final pressures, and T1 and T2 are the initial and final absolute temperatures respectively. So, to find out how the pressure changes with temperature, you can rearrange the formula to solve for the new pressure. Essentially, if you double the absolute temperature (measured in Kelvin), you double the pressure.

Answer: 323.67ml

Explanation:please see attachment for explanation. Thanks

To find the new volume of the nitrogen gas at a different pressure, we can use the gas law equation PV = nRT. By rearranging the equation and plugging in the given values, we can calculate the new volume.

To solve this problem, we can use the gas law equation: PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin. Since the temperature remains constant, we can simplify the equation to PV = constant. First, we need to convert the pressure from mm Hg to atm by dividing it by 760. Then, we can use the equation to find the new volume:

P1V1 = P2V2

Plugging in the values and solving for V2:

V2 = (P1 * V1) / P2

Let's substitute the given values:
V2 = (0.971 atm * 500 ml) / (1140 mm Hg / 760 mm Hg/ atm)

After converting mL to L and performing the calculation, we get:

V2 = 0.207 L

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Answer:

3

Explanation:

According to law of conservation of mass energy and charge the mass energy and charge will remain conserved.

Answer:

A balanced chemical equation has the same number of atoms of each element on both sides.

Explanation:

This is because of the Law of Conservation of Mass. Therefore, valid chemical equations need to be balanced, in other words, to have the same number of atoms of each element on both sides.

Answer:

noble gas

Explanation:

Answer:

It can't be done.

Explanation:

If you have only 5.4 g of oxygen, the most lithium oxide you can get is 7.7 g.

Only 2.3 g of lithium will react. and the other 22.3 g of lithium will not be used.

Answer:

The statement which is false is b. Electrons are negatively charged and have a mass of 1 amu.

Explanation:

Protons can be described as the positively charged part of an atom. Neutrons are the part of an atom which do not carry ant charge. The protons and neutrons are present in the nucleus of an atom. The atomic mass unit of a proton and a neutron is almost 1.

Electrons are the negative charge particles of an atom. They do not have a mass of 1 atomic mass unit. Their atomic mass unit is almost zero. Hence, option B is false.

Answer:

High density, metallic bonds

Explanation:

We may look at this question from the structural properties of the metals:

Answer:

Correct answer - wheels

Explanation:

Limiting reactant:

The reactant that is used up first in the chemical reaction.i.e. the reactant that restricts the amount of product that can be produced.The unused product left in the reaction.

For example,

[tex]2H_{2}+O_{2}\rightarrow 2H_{2}O[/tex]

The ratio of creating [tex]H_{2}O[/tex] is

[tex]2molH_{2}:1molO_{2}:2molH_{2}O[/tex]

If you had 8 moles of hydrogen and only 3 moles of oxygen ;you would have enough oxygen to produce 6 moles of water with 2 moles of hydrogen leftover.

From the given,

200 handle bars, 150 wheels,  250 pedals, and 75 seats.

For tricycle making, each one required one seat, handle,two pedals and three wheels.

Hence, wheels are first consumed.

Therefore,  wheels are limiting reactant.

Answer: X = 5

Explanation: 4x + 7 = 22 + x​

Collect like terms

4x — x = 22 — 7

3x = 15

3x/3 = 15/3

X = 5

Answer:

I think its allow some to leak out into the air and leve it out on a cold day sorry if its wrong <3

Explanation:

Answer:

85 x 10³ ppm  

Explanation:

Data Given:

mass of sucrose = 17 g

mass of water = 183 g

Concentration in ppm = ?

Solution:

Formula Used

                   Concentration (ppm) = Solute / Solution x 10⁶ ............ (1)

**Note : 1 ppm = 1 mg / L

First we have to know about mass of solution

So

       Mass of solution = mass of solute + mass of solvent ................. (2)

Put values in equation 2

        Mass of solution = 17 g sucrose + 183 g water

        Mass of solution = 200 g

Now Put Values in equation 1

          Concentration (ppm) = Solute / Solution x 10⁶

          Concentration (ppm) = 17 g / 200g x 10⁶

          Concentration (ppm) = 0.085 x 10⁶

           Concentration (ppm) = 85 x 10³

Concentration  of sucrose = 85 x 10³ ppm      

The concentration of sucrose in the solution is 85,000 parts per million (ppm).

The concentration of sucrose in the given solution can be calculated using the formula:

Concentration (ppm) = mass of solute (g) / mass of solution (g) x 10^6

For this case, the mass of sucrose is 17 grams and the mass of the solution (sucrose + water) is 17 grams + 183 grams = 200 grams. Plugging in the values, we get:

Concentration (ppm) = 17 g / 200 g x 10*6 = 85,000 ppm

Therefore, the concentration of sucrose in the solution is 85,000 parts per million (ppm).

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Answer:

Explanation:

Balanced Chemical equation:

HClO₂(aq) + NaOH(aq) → H₂O(l) + NaClO₂ (aq)

Ionic equation:

H⁺(aq) + ClO₂⁻(aq) + Na⁺(aq) + OH⁻(aq) → H₂O(l) + Na⁺(aq) + ClO₂⁻ (aq)

Net ionic equation:

H⁺(aq) + OH⁻(aq) → H₂O(l)  

The ClO₂⁻(aq) and Na⁺ (aq) are spectator ions that's why these are not written in net ionic equation. The water can not be splitted into ions because it is present in liquid form.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.  

Chemical equation:

NaCl(aq) + KBr(aq)  → NaBr(aq) + KCl(aq)

Ionic equation:

Na⁺(aq)  + Cl⁻(aq) + K⁺(aq)  + Br⁻(aq)  → Na⁺(aq) + Br⁻(aq) + K⁺(aq)  + Cl⁻(aq)

Net ionic equation can not be written for this reaction because nothing is changed on both side. There is no solid, liquid and gaseous product. All are aqueous and cancel each other.

Answer: Hybridization

Explanation:

I did it on ck12 and got it right and here’s this short story of it

Final answer:

Annealing refers to the process in which two complementary DNA strands bind through hydrogen bonds between their base pairs, A-T and G-C, which are essential in maintaining the structure and function of the DNA double helix.

Explanation:

The process where two genetic sequences bind together because of the hydrogen bonds that form between the base pairs is known as annealing. This is a critical aspect of DNA structure and function, where the complementary base pairs A-T (adenine-thymine) and G-C (guanine-cytosine) come together. The hydrogen bonds hold the bases together, with A and T forming two hydrogen bonds, and G and C forming three hydrogen bonds. This mechanism is not only crucial in the formation of the double helix structure of DNA but is also vital during the processes of DNA replication and transcription, where the genetic code is copied and read to synthesize proteins.

Answer:

Your answer is:

Explanation:

A) The acceleration due to gravity for any object, including 1 washer on the string, is always assumed to be  10  m/s2.

B) The mass of 3 washers, when converted to kg, is  0.0147  kg.

C) The applied force of 3 washers will increase the applied force on the car to 0.147  N.

I hope this helps!

- sincerelynini

Answer:

A) 10 m/(s^2)

B) 0.0147 kg

C) 0.147 N

Explanation:

A) It's stated in the table that the acceleration due to gravity is assumed as 10 m/(s^2).  If you assume this value in one calculation, then you have to assume the same value in all your calculations.

B) 3 washers have a mass of 14.7 grams. Dividing this mass by 1000, you convert grams into kilograms, that makes 0.0147 kg.

C) Force measured in kilograms times meters per second squared are equivalent to Newtons, therefore, 0.147 kg*m/(s^2) = 0.147 N

Answer:

3=  (x/20.0g) x 100%

or    (20)(0.03)

Answer  0.6g

Final answer:

The total mass of H2O2 in a 20 grams 3.00% aqueous H2O2 solution is 0.6 grams, calculated by taking 3.00% of the total mass of the solution.

Explanation:

To calculate the total mass of H2O2 in 20 grams of a 3.00% aqueous H2O2 solution, use the percentage by mass. The mass of H2O2 can be found by multiplying the total mass of the solution by the percentage of H2O2 in the solution (3.00%).

The calculation is as follows:

Therefore, the amount of H2O2 in a 20 grams aqueous solution is 0.6 grams.

Answer: Correct statements are given below:

1) In activity series elements are listed according to their reactivity.

2) Nuclear reaction in which low atomic nuclei fuse to form a heavier nucleus with the release of energy. Nuclear fusion reaction occurs in the sun.

3) C3H8 + 5O2 → 3CO2 + 4H2O is the example of a combustion reaction.

4) 2Fe + O2 → 2FeO is the example of synthesis reaction. In synthesis reaction is a type of reaction in which two reactants combine to form a single product.

The activity series is an arrangement of elements in order of reactivity.

The activity series is an arrangement of elements in order of reactivity. The activity series shows the order in which chemical elements will displace each other in a replacement reaction.

A nuclear fusion is said to have occurred when two light nuclei come together to yield a heavier nucleus with the emission of a tremendous amount of energy. Nuclear fusion occurs in the sun.

A combustion reaction refers to the reaction of a substance with oxygen. A synthesis reaction is a reaction in which two or more substances come together to form a new substance. A combustion reaction which is also a synthesis reaction is 2Fe + O2 → 2FeO.

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Answer:

Coefficients are the numbers in front of the formulas.

Answer:

a coefficient is a multiplicative factor in some term of a polynomial, a series, or any expression; it is usually a number, but may be any expression. In the latter case, the variables appearing in the coefficients are often called parameters, and must be clearly distinguished from the other variables.

For example, in

7x^{2}-3xy+1.5+y,}{\displaystyle 7x^{2}-3xy+1.5+y,}

Explanation:

Answer:

The correct option is B) Because their embryos have structures similar to

gills, chickens and humans likely share a common  ancestor with fish.

Explanation:

Evolutionary studies show common traits which are present among organisms of different species. Based on these traits, we can tell that which species might have shared common ancestors in the past.

In the structure shown above, we can see that the embryo of a human and a chicken have a structure  similar to the gills of fishes. This shows that these organisms might have shared a common ancestor in the past.

Answer:

The correct answer is B

Answer:

Hydrochloric acid (HCl)

Answer: C

Explanation:

Physical properties of copper metal are high thermal conductivity, high electrical conductivity, ductility, malleability etc.

A physical property is a characteristic of matter that can be observed or measured without changing the substance itself. Examples include color, shape, density, and melting point.

Copper is a metal that has several physical properties that make it useful in various applications. Some of the physical properties of copper are:

1. High thermal conductivity: Copper is an excellent conductor of heat, which makes it useful in various applications such as electrical wiring, plumbing, and heating systems.

2. High electrical conductivity: Copper is also an excellent conductor of electricity, which makes it useful in electrical wiring and other electrical applications.

3. Ductility: Copper is a highly ductile metal, which means it can be easily drawn into wires or other shapes without breaking.

4. Malleability: Copper is a highly malleable metal, which means it can be easily shaped or flattened into thin sheets.

5. Corrosion resistance: Copper is resistant to corrosion, which makes it useful in various applications where it is exposed to moisture or other corrosive materials.

In conclusion, high thermal conductivity, high electrical conductivity, ductility, malleability are the physical properties possessed by copper.

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Final answer:

A physical property of copper includes its malleability, ductility, high thermal and electrical conductivity, and its characteristic pinkish-orange color when freshly exposed.

Explanation:

The question involves identifying a physical property of copper. A physical property can be observed or measured without changing the substance's identity. For copper, some of its physical properties include its reddish-brown color, malleability, ductility, and high thermal and electrical conductivity. Since copper is such a good conductor of electricity, it is often used in electrical wiring. Being ductile, it can be stretched into wires without breaking. Copper's pinkish-orange color when freshly exposed is another key physical property.

Answer: Option (1) is the correct option that is currents deflect to the right due to the rotation of Earth.

Explanation:

The water on the surface of ocean is moved by winds that blow in certain direction because of the Coriolis effect and spinning of the Earth that's why ocean currents in the Northern hemisphere tend to move in the clock-wise direction.

Answer:

They can only contain one type of atoms, one type of molecules or one type of ionic salts

Explanation:

Remember that substances might be made of:

That said, pure substances would only contain one type of atoms, one type of molecules or one type of ionic salts. Any additional components of different atoms, molecules or ionic salts would cause a pure substance to become a mixture of several substances.

Answer:

they may contain one type of atom or one type of molecule

Answer:

78.9g

Explanation:

To find the mass of magnesium chloride produced, convert 20.0 g of magnesium to moles, use the reaction's stoichiometry to get the moles of magnesium chloride, and then convert back to grams. The balanced chemical equation for the reaction is Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g), and the result is 78.33 grams of magnesium chloride.

To find out how many grams of magnesium chloride will be produced when 20.0 g of magnesium react with excess hydrochloric acid, we first need to consider the balanced chemical equation for the reaction:

Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g)

From the balanced equation, we see that one mole of magnesium (Mg) reacts with two moles of hydrochloric acid (HCl) to produce one mole of magnesium chloride (MgCl₂) and one mole of hydrogen gas (H₂). To determine the mass of magnesium chloride produced, use the molar mass of magnesium (24.31 g/mol) to convert the mass of magnesium into moles, then use the stoichiometry of the reaction to find the corresponding moles of magnesium chloride produced.

The molar mass of magnesium chloride (MgCl₂) is 95.21 g/mol. After calculating the moles of Mg, that amount will be directly equal to the moles of MgCl₂ formed, since the ratio is 1:1. Finally, convert the moles of magnesium chloride to grams using its molar mass.

The calculation steps are as follows:

Therefore, 78.33 grams of magnesium chloride will be produced when 20.0 g of magnesium reacts with excess hydrochloric acid.

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