Which type of reaction is indicated by a positive AH?
o an endothermic reaction
O a reversible reaction
O a spontaneous reaction
O an exothermic reaction

Igneous rock  commonly often contains gas bubbles and the mineral(s) hornblende, muscovite, olivine, lucite, and/or plagioclase.

What are igneous rocks?

Igneous rocks are rocks that form when molten rock cools and solidifies, either below the Earth's surface or on its surface. They are the oldest type of rocks on the planet and are composed primarily of crystals. Examples of igneous rocks include basalt, gabbro, granite, obsidian, pumice, and scoria.

Igneous rocks form from cooling and crystallizing molten rock, or magma. As the magma cools, minerals crystallize out of the molten material, forming the igneous rock. Hornblende, muscovite, olivine, lucite, and/or plagioclase are all common minerals that form as the magma cools, due to their high melting points. Gas bubbles may also form as the magma cools, creating a "vesicular" texture.

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When a beaker of ethanoic acid is placed in the refrigerator and mix it with sodium carbonate, its temperature drops down and endothermic reaction take place.

[tex]2CH_{3} COOH + NaCO_{3}[/tex]    ⇒ [tex]CH_{3}COONa + NaHCO_{3}[/tex]

This chemical reaction is a reversible reaction.

Ethanoic acid and sodium carbonate combine to form an endothermic reaction that results in fizzing as carbon dioxide is released and heat is lost to the environment, making the reaction vessel feel chilly to the touch.

The difference between adding sodium carbonate to the solution and refrigerating ethanoic acid is that no new substance is created in the former. When the substance is taken out of the refrigerator, it is still ethanoic acid. New chemicals are created in the latter scenario. Because of a chemical process, the material is no longer ethanoic acid.

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Carbon Dioxide: CO2

Formula: C + O2

15.0 moles of CO2 contains (15.0 moles CO2) x (1 mole C / 1 mole CO2) = 15.0 moles of C

Carbon Dioxide: CO2

Formula: C + O2

15.0 moles of CO2 contains (15.0 moles CO2) x (2 moles O / 1 mole CO2) = 30.0 moles of O

Calcium Chloride: CaCl2

Formula: Ca + 2Cl

23.0 moles of CaCl2 contains (23.0 moles CaCl2) x (1 mole Cl / 2 moles Cl) = 11.5 moles of Cl

Sulfur Dioxide: SO2

Formula: S + O2

295.0 grams of SO2 contains (295.0 grams SO2) x (1 mole S / 64.066 grams) = 4.6 moles of S

Potassium Sulfate: K2SO4

Formula: 2K + S + 4O

295.0 grams of K2SO4 contains (295.0 grams K2SO4) x (1 mole S / 174.259 grams) = 1.69 moles of S

Iron: Fe

Formula: Fe

565.0 grams of Fe contains (565.0 grams Fe) x (1 mole Fe / 55.845 grams) = 10.15 moles of Fe

metallic elements

SO2 is a covalent compound. It consists of one sulfur atom and two oxygen atoms joined together by covalent bonds, which are strong chemical bonds where electrons are shared between atoms.

H

|

O-H

A water molecule is polar because the electrons are not shared equally between the oxygen and hydrogen atoms. Oxygen is more electronegative than hydrogen, so it pulls the electrons closer to itself, creating a partial negative charge on the oxygen side of the molecule and a partial positive charge on the hydrogen side. This causes the molecule to have a dipole moment and makes the molecule polar.

NH3 (Ammonia) - the molecule is a pyramidal shape, which means that the Nitrogen is at the center and the three hydrogen atoms are located at the three corners of a pyramid.

H2O (Water) - the molecule is a V-shape, this shape is determined by the angle between the two bonding pairs and the two non-bonding pairs of electrons.

CH4 (Methane) - the molecule is tetrahedral shape, the carbon is in the center, and the four hydrogen atoms surround the carbon in a tetrahedral arrangement.

A color change

The formation of a precipitate

The evolution of a gas

A change in temperature

Uday Tahlan

Answer:

The 2nd option

The theoretical yield of water in this reaction is 1 mole (18.015 grams) of water.

Theoretical yield is the amount of a product one would expect to yield from a reaction if it proceeds to completion, according to a balanced chemical equation. It is calculated by multiplying the limiting reactant by the molar ratio between the reactants and the products. The actual yield of a reaction is usually lower than the theoretical yield, due to a number of factors such as incomplete conversion of reactants to products, product losses, and impurities in the reactants. Theoretical yield is used to calculate the percentage yield of a reaction, which is the ratio of the actual yield to the theoretical yield multiplied by 100.

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Answer:

360.g water

Explanation:

Answer:

A. Solar, wind, hydro, nuclear, tidal, and biomass are renewable resources

B. Oil, coal, and natural gasses are the fossil fuels that are nonrenewable resources

C. It is important to move from nonrenewable to renewable because nonrenewable resources will run out and they also create greenhouse gases that hurt the enviroment and cause global warming. Renewable resources are cleaner and either don't run out, or replenish fast enough to not run out

Answer:

I think it would be B

Explanation:

Im sorry if its wrong!!!!!!!

a reaction such as A+B -> products that exhibits second-order kinetics can be studied using a large excess of one reactant. Under these conditions, the concentration of the reactant in excess will not change much during the reaction, which will exhibit pseudo-first-order kinetics.

A fraud or imposter is defined as something or someone that is false but attempts to pass for the real deal. Although it's typically a prefix, pseudo can refer to a faker. A pseudo-intellectual, for instance, will attempt to persuade you that he has a brilliant mind despite the fact that he does not. The fame of a pseudo-celebrity is minimal. A combining form with the meaning "false," "pretended," or "unreal," used in the creation of compound words (pseudo classic; pseudointellectual); in science, designating a close or deceptive resemblance to the following element (pseudobulb; pseudocarp); and occasionally used in the chemical names of isomers (pseudoephedrine). a person who professes to be skilled in academic or creative endeavours but lacks in-depth comprehension or critical thinking. a person who exaggerates their intelligence and engages in intelligence fraud.

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Answer:

1Cu --> 1Cu+2 + 2e

2e +1S-->1S-2

Cu + S --> CuS

Explanation:

The propensity of an atom of a certain chemical element to draw shared electrons when forming a chemical bond is known as electronegativity and is denoted by the symbol X.

The atomic number and the separation of the valence electrons from the charged nucleus have an impact on an atom's electronegativity. An atom or a substituent group will draw electrons in greater amounts the higher the associated electronegativity. The sign and amplitude of a bond's chemical polarity, which characterizes a bond along the continuous scale from covalent to ionic bonding, can be quantitatively estimated using electronegativity. The inverse of electronegativity is electropositivity, which describes an element's propensity to accept valence electrons.

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Answer:

The bromine atom in bromine fluoride, or BrF, has an oxidation number of +1. In bromine dioxide, or BrO2, it has an oxidation number of +4. This is because fluorine usually has an oxidation number of -1, and oxygen usually has an oxidation number of -2.

Explanation:

I got this from online so...

We measure the distance through many objects like; Radar, Parallax, Capheids, Redshift and Hubble's Law etc.

Distance is termed as the size or magnitude of the displacement between two positions.  

There are several ways to measure the distance in terms of science. Firstly, Radar: It is used to measure the distance in our solar system and to measuring the distances to nearby the stars are Parallax. Whereas, Capheids is also used to measuring the distance in our galaxy and to nearby the galaxies. However, Supernovae will measuring the distances to other galaxies and the last one is Redshift and Hubble's Law it is used to measuring the distances to objects which is far away.

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Answer: to calculate pH use -log[H+] or - log[OH-]..the solution is basic as the “NaOH” is attached to a hydroxide.Since we need to find the pH (per hydrogen) and not the pOH( per hydroxide) we need to find the pOH of the substance first then we subtract that by 14 so we can arrive at the pH of the substance.

Explanation: So -log( 1 x 10^(-5)) = 5 which is the pOH.Now we subtract that by 14 which gives us -9 and now you’d multiply that by -1 bcuz we can’t have a negative so the pH of the substance is 9

Answer:

3 Ca

3 S

12 O

Explanation:

You have 3 moles of Ca(SO4)

Therefore you multiply the subscript of each atom of the compound by 3.

Ca and S have a understood subscript of 1 so there are three of each.

There are 4 oxygen atoms in one mole of CaSO4 so in 3 moles there would be 4*3 so 12

The number of moles of a monoprotic acid neutralized is equal to 0.025 mol.

A neutralization reaction can be defined as a reaction in which reaction of an acid and base generates salt and water. When a strong acid and a strong base react the salt can be neither acidic nor basic.

When monoprotic acid HA reacts with NaOH (a strong base), the resulting salt is NaA and water.

HA    +    NaOH   →   NaA  +   H₂O

Given, the concentration of NaOH = 0.544 M

The volume of the NaOH = 45.50 ml = 45.50 × 10⁻³

The number of moles of NaOH, n = M × V = 0.544 × 45.50 × 10⁻³ = 0.025 mol

The number of moles of HA monoprotic acid = moles of NaOH = 0.025 mol

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In a container, the pressure of hydrogen sulfide gas is 267.4 torr.

The force of all gas particle/wall collisions divided by the area of the wall is defined as pressure (P): Pressure is one of the primary observable quantities of this phase of matter; it is exerted by all gases. The amount of force exerted per area is described as pressure. Pressure is defined as force divided by area. The pressure from snow on a roof, for example, would equal the weight of the snow divided by the area of the roof. In chemistry, pressure is often generated by gases. When you blow up a balloon, you fill it with gas.

Here,

pressure of hydrogen sulfide gas= 35650 Pa

1 torr=133.33 Pa

=35650/133.33

=267.38 torr

The pressure of hydrogen sulfide gas in a container is 267.4 torr.

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By beta, tungsten 188 decays. The mechanism through which an insecure atomic structure is produced is known as radioactive decay.

The process through which highly unstable molecular nucleus loses its energy through radiation is described as radioactive decay, also characterized as nuclear decay, radiography, radioactivity breakdown, or nuclear disintegration. A substance that has unstable nuclei is regarded as radioactive. For a large variety of human activities, radioactive decay is crucial.

Alpha, beta, and/or gamma rays are all types of ionizing radiation that are released when radioactive atoms decay. Because the energy is powerful enough to dislodge firmly coupled electrons from just an atom's orbit, it is known as ionizing radiation. As a result, the atom develops into a charged ion.

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Te, S, and c are the following sets of elements, and they will all produce ions with a charge of two (option b).

An essential element of a totality. In chemistry, a simple substance is one that cannot be divided into smaller components or transformed into another substance. An element's fundamental building block is an atom, which is made up of protons, neutrons, & electrons. The number of atoms in an element's protons is continuous.

Earth, Water, Wind, Fire, Ice, Thunder, Time, Flower, Shadow, Light, and Moon are the twelve natural elements. These simplified terminology for more advanced and complicated compounds refer to each of these elements.

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Answer:

True

Explanation:

The heat of the earths mantle is estimated to be between 1000-3700 degrees celcius, and the earths core is estimated to be higher than 5200 degrees Celsius so even if the higher end estimates are true for the mantle it wouldn’t affect the answer.

Also the fact the core is closer to the center of the earth it ends up being hotter due to the pressure being higher the lower you go as the ground below has to carry more weight above.

sources:

“National Geographic.” National Geographic, https://www.nationalgeographic.org/encyclopedia/mantle/. Accessed 8 May 2021.

“National Geographic.” National Geographic, https://www.nationalgeographic.org/encyclopedia/core/. Accessed 8 May 2021.

Answer:

sure mantle is hotter than the core

Answer:

B and C

Explanation:

powder dissolve faster than particles

the higher the temperature the faster the dissolving process

Considering the definition of molar mass,  the mass in 2.6 moles of C₈H₁₂ is 0.2808 kg.

The molar mass of an atom or molecule is the mass of one mole of that particle expressed in grams.

The molar mass of a compound is the sum of the molar mass of the elements that form it multiplied by the number of times they appear in the compound.

Being the molar mass of C₈H₁₂ 108 g/mole, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 108 grams, 2.6 moles of the compound contains how much mass?

mass= (2.6 moles× 108 grams)÷ 1 mole

mass= 280.8 grams= 0.2808 kg (being 1000 gr= 1 kg)

Finally, the mass is 0.2808 kg.

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The concentration of the standard solution (in M) if 15 mL of a 0.2512 M Co(NO3)2 stock solution is added to a 50 mL volumetric flask and diluted to the mark is  0.07536M.

Given volume of Co(NO3)2 stock solution (V1) = 15mL =0.015L

Concentration of Co(NO3)2 stock solution is (M1) = 0.2512M

Volume of  volumetric flask (V2) = 50mL = 0.050L

Concentration of standard solution = M2

The number of moles of solute divided by the number of liters of solution is the definition of molarity, a concentration unit in chemistry.

We know that M1V1 = M2V2. Such that,

0.2512 x 0.015 = M2 x 0.050

M2 = 0.07536M

Hence the required concentration of standard solution is  0.07536M

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The formula for the equilibrium constant is; [tex][HI]^{2} /[H_{2} ] [I_{2} ][/tex]

We know that when we talk about the equilibrium constant that we are looking at the kind of constant that shows the extent to which there has been the conversion of the reactants to the products.

We can be able to obtain the equilibrium constant of the system by the application of the law of mass action and this would give the correct6 form of the expression for the equilibrium constant. This is how we know which of the species would have the square.

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Physical characteristics known as size dependant properties alter as an object's size does. Examples of qualities that depend on size include length, width, height, volume, and mass.

The amount or size of the material affects several physical properties of matter, including length, mass, volume, weight, and so forth. These characteristics of matter and their values change together with the size or quantity of the substance.

In physics, mass is a way to measure inertia, a fundamental property of all matter. In actuality, it is the resistance a body of matter provides to a change in its speed or location.

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Answer:

Cloud cover feedback

Explanation:

Answer:

Cloud cover feedback

Explanation:

took a test on this and got it correct! hope this helps! have a good day!

C. the denser the plants the better.

Answer:

C

Answer: Plants with higher density of the bacteria on their roots have increased rates of survival reproduction

Explanation:

Answer:

c

Explanation:

took it

Use the grams to moles formula to calculate the number of moles, n, of a substance with a given mass, m, (in grams) accurately, where M denotes the substance's molar mass. Typically, g/mol is used as the unit.

n = m / M

The mole is the SI unit used to measure a substance's quantity. There are precisely 6.02214085774× 10²³ atoms, molecules, or other particles in one mole of matter. The Avogadro number is this enormous magnitude. A mole of a substance is defined as a mass of material that contains exactly 12,000 g of 12C's exact number of atoms as fundamental units. The International System of Units uses the mole (symbol: mol) as the unit of material quantity (SI). 

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Answer:

D.A-C would have the same number of atom