a man is cooking rice by burning wood in the stove what are the thermal and heat absorbing chemical reaction here?

The molar concentration of SO4^2- anions in the solution is about 3.867 M.

To answer your question, first we need to write the balanced net ionic equation:

Cr^2+(aq) + Cu^2+(aq) → Cr^3+(aq) + Cu(s)

Now, we need to determine the number of moles of Cr(NO3)2 and CuSO4:

Cr(NO3)2: 33.6 g / (130.87 g/mol) = 0.257 moles
CuSO4: 60.5 g / (159.61 g/mol) = 0.379 moles

From the balanced net ionic equation, we can see that 1 mole of Cr^2+ reacts with 1 mole of Cu^2+. Since we have more moles of Cu^2+ than Cr^2+, Cr^2+ is the limiting reagent.

Now, let's calculate the number of electrons transferred:

Since each Cr^2+ ion loses one electron, the number of electrons transferred is equal to the number of moles of Cr^2+ ions:
0.257 moles * 1e- = 0.257e-

Since we need the smallest whole-number coefficients, we'll multiply by the lowest common denominator (LCD) to make the number of electrons a whole number. The LCD for 0.257 is 7, so we'll multiply the entire equation by 7:

7Cr^2+(aq) + 7Cu^2+(aq) → 7Cr^3+(aq) + 7Cu(s)

Therefore, the number of electrons transferred is:
0.257e- * 7 = 1.799e- ≈ 2e-
So the correct answer is 2e-.

(Part 2) To find the molar concentration of SO4^2- anions in the solution, we need to use the moles of CuSO4 and the volume of the solution:

0.379 moles / 0.098 L = 3.867 M

The molar concentration of SO4^2- anions in the solution is approximately 3.867 M.

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Answer:

Potable water, also known as drinking water, comes from surface and ground sources and is treated to levels that that meet state and federal standards for consumption.

Answer

acidic

Explanation

The pH scale ranges from 0 to 14, with 7 being neutral. pHs less than 7 are acidic while pHs greater than 7 are alkaline (basic).

Hence, coffee has a pH of about 5 which means it is considered to be in the acidic range.

Answer:

C

Explanation:

i took the test

The temperate climatic zone has hot summers, cold winters, and average amounts of precipitation throughout the year. Thus, option C is correct.

The climatic zone may be defined as a world area or part discerned from a neighbor by a significant physical climatic attribute that is of a transnational scale.

The movement of the sun from the tropic of cancer to the tropic of Capricorn determines the climate of a particular zone. The equator zone is more consistent with climatic attributes. The tropical zone has seasonal climatic attributes.  

Therefore, the correct option is C.

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Radioactive waste dumping in oceans has been Banned worldwide since 1957. So The correct answer is D.

The dumping of radioactive waste in oceans has been globally banned since 1957. The practice of disposing of radioactive waste in oceans was more prevalent before the harmful effects of such actions were fully understood. However, increased awareness of the potential ecological and human health risks associated with radioactive waste disposal led to international agreements to prohibit this practice.

In 1957, the United Nations adopted the Convention on the Prevention of Marine Pollution by Dumping of Wastes and Other Matter, commonly known as the London Convention. This international treaty established regulations to prevent the dumping of various substances, including radioactive waste, into the oceans. Over time, additional protocols and amendments were introduced to strengthen these regulations and expand the scope of the ban.

The global consensus is that dumping radioactive waste into the oceans poses significant environmental and health hazards. Radioactive materials can persist in the marine environment for extended periods, potentially contaminating marine ecosystems and impacting human populations through the consumption of contaminated seafood.

In conclusion, the dumping of radioactive waste in oceans has been banned worldwide since 1957. This ban reflects the international recognition of the potential dangers associated with such practices and the commitment to protect marine ecosystems and human health from the adverse effects of radioactive waste disposal.

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Answer:

The reason is carbon's ability to form stable bonds with many elements, including itself. 

Explanation:

This property allows carbon to form a huge variety of very large and complex molecules. In fact, there are nearly 10 million carbon-based compounds in living things!

Answer:

Explanation:

The reason is that carbon is able to form stable bonds with many elements, including itself, which allows carbon to form a huge variety of very large and complex molecules.

The statement that is definitely true about Substance Z, a compound is: It may or may not react with air or water.

The correct option is D.

Pure substances are substances that are composed of entirely the same type of particles or molecules.

Examples of pure substances are elements and compounds.

Elements are pure substances that are cannot be split into simpler units by an ordinary chemical process. Examples are sodium, oxygen, etc.

Compounds are substances that are composed of two or more elements chemically combined together. Examples are sodium chloride and carbon dioxide.

Considering the properties of Substance Z:

Substance X and Substance Y react to produce Substance Z;

Substance Z is a compound and may have properties different from X and Y.

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Answer:

Explanation:

mg +2hcl=mgcl2 +h2

mhcl=10.95g

nhcl==0.3

nmg=1/2nhcl=0.15

mMg=3.6g

m mgcl2=14.25

Smartphones are genuinely global devices because to their capacity for global communication and their mineral list of different nationalities.

Typically created by inorganic processes, a mineral is a naturally occurring homogenous solid having a specific chemical composition with a highly organised atomic arrangement. About 100 of the known mineral species—the so-called rock-forming minerals—make up the majority of the known mineral species, which number in the thousands.

Smartphones are genuinely global devices because to their capacity for global communication and their ingredient list of different nationalities. However, because minerals are obtained from every corner of the world, the threat of a supply interruption is more pressing than ever.

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Answer:

Water is a compound. It contains more than one element: hydrogen and oxygen atoms are joined together;

Answer: OB. Secondary Sectors.

Explanation: Make sure to study as the text provided, and study guide state manufacturers, butchers, and factory employees are apart of the secondary sector in the world economy. You’ll do great on Quiz 3.2.5! Make sure to study, have a g’day. Please don’t listen to people who say this answer is falsen as many other questions do, don’t be the one to spread false information as this people’s academics, here’s a picture as well ❤︎. Again, its B!

Answer:

b answer

Explanation:

peGsi7dhxp 7focpc9fiic99. ft

Answer:

Option. d

A new moon occurs when the moon is between Earth and the sun , while a full moon occur when Earth is between the moon and sun.

Explanation:

Lunar Model 1:

Solar eclipse- A solar eclipse occurs when a portion of the Earth is engulfed in a shadow cast by the Moon which fully or partially blocks sunlight. This occurs when the Sun, Moon and Earth are aligned. Such alignment coincides with a new moon indicating the Moon is closest to the ecliptic plane.

Lunar Model 2:

Lunar eclipse- A lunar eclipse occurs when the Moon moves into the Earth's shadow. This can occur only when the Sun, Earth, and Moon are exactly or very closely aligned with Earth between the other two, and only on the night of a full moon.

Answer:

CH4

Explanation:

Answer:

observation

Explanation:

Answer:

The velocity of the bb when it reaches a height of 203 m can be determined using the laws of projectile motion. Since the bb is moving vertically upwards, its velocity at that height will be zero.

brainlest?

Answer: v = 83.96 m/s

Assuming the acceleration due to gravity is approximately 9.8 m/s^2, we can use the principles of projectile motion and energy conservation.

Using the equation for the vertical displacement of an object in free fall:

Δy = (v₀² - v²) / (2g)

Δy = vertical displacement (203m)

v₀ = initial velocity (105 m/s)

v = final velocity (not known yet)

g = accerlation due to gravity (9.8 m/s^2)

Lets rearrange the equation to solve for the final velocity:

v = v = √(v₀² - 2gΔy)

Substituting the given values:

v = √(105² - 2 * 9.8 * 203)

v ≈ √(11025 - 3979.6)

v ≈ √(7054.4)

v ≈ 83.96 m/s

Therefore, when the BB pellet is at the height of 203m, its velocity will be approximately 83.96 m/s.

The molecularity of a reaction is the number of molecules or ions that participate as reactants in an elementary reaction. Here are the molecularity and rate law expressions for the given elementary reactions:

(a) Cl2(g) → 2 Cl(g)

Molecularity: 1 (since one Cl2 molecule is involved in the reaction)

Rate law: rate = k[Cl2]

(b) OCl–(aq) + H2O(l) → HOCl(aq) + OH–(aq)

Molecularity: 2 (since one OCl- ion and one H2O molecule are involved in the reaction)

Rate law: rate = k[OCl-][H2O]

(c) NO(g) + Cl2(g) → NOCl2(g)

Molecularity: 2 (since one NO molecule and one Cl2 molecule are involved in the reaction)

Rate law: rate = k[NO][Cl2].

Molecularity in chemistry is the number of molecules that react together in an elementary reaction and is equal to the sum of the stoichiometric coefficients of the reactants in this elementary reaction. Depending on how many molecules are analyzed together, reactions can occur unimolecularly, bimolecularly, or trimolecularly.

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The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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An FCC unit cell with a lattice constant, a, of 3.2A˚. The surface atomic concentration of the (1​1​1) plane in this crystal is 0.2202 atoms/Ų.

To determine the surface atomic concentration of the (111) plane in an FCC crystal, we need to consider the arrangement of atoms on that plane.

In an FCC crystal, the (111) plane consists of a triangular array of atoms. Each triangular arrangement contains one atom at the center and three atoms at the corners.

To calculate the surface atomic concentration, we need to determine the number of atoms on the (111) plane per unit area. This can be done by considering the area of the unit cell and the arrangement of atoms.

The area of the unit cell in the (111) plane can be calculated using the lattice constant, a. Since the (111) plane is a triangular plane, the area of the unit cell in that plane is given by:

Area = (√(3) * a²) / 2

To determine the number of atoms on the (111) plane. Each triangular arrangement on the (111) plane contains one atom at the center and three atoms at the corners.

Therefore, the total number of atoms on the (111) plane per unit cell is:

Number of Atoms = 1 (central atom) + 3 (corner atoms) = 4

Calculate the surface atomic concentration by dividing the number of atoms on the (111) plane by the area of the unit cell in that plane:

Surface Atomic Concentration = Number of Atoms / Area

Substituting the values, we have:

Surface Atomic Concentration = 4 / [(√(3) * a²) / 2]

Given that the lattice constant, a, is 3.2 Å, we can calculate the surface atomic concentration as follows:

Surface Atomic Concentration = 4 / [(√(3) * 3.2²) / 2]

Surface Atomic Concentration = 0.2202 atoms/Ų

Therefore, the surface atomic concentration of the (111) plane in the given FCC crystal with a lattice constant of 3.2 Šis approximately 0.2202 atoms/Ų.

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The difference in binding energy per nucleon between 23/11 Na and 23/12 Mg can be calculated by finding the total binding energy for each isobar and dividing it by the respective number of nucleons.

To calculate the difference in binding energy per nucleon between the isobars 23/11 Na and 23/12 Mg, we need to find the total binding energy for each isobar and then divide it by the respective number of nucleons.

The atomic mass of 23/11 Na is 23, which means it has 23 nucleons (protons and neutrons). The atomic number is 11, indicating it has 11 protons.

The atomic mass of 23/12 Mg is also 23, so it has 23 nucleons. However, the atomic number is 12, indicating it has 12 protons.

We can use the equation:

Binding Energy per Nucleon = (Total Binding Energy) / (Number of Nucleons)

To find the total binding energy, we can consult a table or use an approximate average value. Let's assume the average binding energy per nucleon for both elements is 8.5 MeV (million electron volts).

For 23/11 Na:

Binding Energy per Nucleon = (Total Binding Energy of Na) / (Number of Nucleons)

                         = (8.5 MeV) / (23 nucleons)

For 23/12 Mg:

Binding Energy per Nucleon = (Total Binding Energy of Mg) / (Number of Nucleons)

                         = (8.5 MeV) / (23 nucleons)

The difference in binding energy per nucleon can then be calculated by subtracting the value for Na from the value for Mg.

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Answer:

\(\boxed {\boxed {\sf D. \ 4}}\)

Explanation:

The neutrons in an element can be found by subtracting the atomic number from the atomic mass.

\(\sf N=atomic \ mass- atomic \ number\)

Li is the symbol for lithium.

This element has an atomic mass of 6.941, which we can round to 7.

Lithium's atomic number is 3.

\(\sf atomic \ mass =7 \\atomic \ number =3\)

\(\sf N=7-3\)

\(\sf N= 4\)

Lithium has a total number of 4 neutrons.

Answer:

D)4

Explanation:

Lithium is an alkali metal with the atomic number = 3 and an atomic mass of 6.941 g/mol. This means that lithium has 3 protons, 3 electrons and 4 neutrons (6.941 - 3 = ~4).

The value of K_eq for this reaction is approximately 1.805 × 10^-5.

To find the value of the equilibrium constant (K_eq) for the given reaction, we can use the equilibrium concentrations of the species involved. The equilibrium constant expression for the reaction is:

K_eq = [CH3COO-][H3O+] / [CH3COOH]

Given the following concentrations at equilibrium:

[CH3COOH] = 2.0 × 10^-1 M

[CH3COO-] = 1.9 × 10^-3 M

[H3O+] = 1.9 × 10^-3 M

Substituting these values into the equilibrium constant expression, we get:

K_eq = (1.9 × 10^-3)(1.9 × 10^-3) / (2.0 × 10^-1)

K_eq = 3.61 × 10^-6 / 2.0 × 10^-1

K_eq = 3.61 × 10^-6 × 5.0 × 10^0

K_eq = 1.805 × 10^-5

Therefore, the value of K_eq for this reaction is approximately 1.805 × 10^-5.

None of the provided answer choices match this value exactly.

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Explanation:

First, we need to rewrite the equation:

2K + 2H2O -> 2KOH + H2

This equation tells us that 2 moles of K react with 2 moles of H2O and produce 2 moles of KOH and 1 mole of H2.

If we have 43.7 grams of potassium, we can transform it into moles, compare with the ratio between Potassium and Hydrogen (H2) and then, calculate the quantity of hydrogen in grams.

So first, let's transform 43.7 grams of K into moles using the following formula:

moles = mass/molar mass

molar mass of K = 39.10 g/mol

moles = 43.7/39.10

moles = 1.12 moles

So:

2 moles of K --- 1 moles of H2

1.12 moles of K --- x moles of H2

2x = 1.12

x = 1.12/2

x = 0.559 moles of H2

Now let's transform moles into grams using the following formula:

mass = moles x molar mass

molar mass of H2 = 2.02 g/mol

mass = 0.559 x 2.02

mass = 1.13 g

Answer: It is produced 1.13 grams of H2.

Answer:

They may have different phenotypes because of differences in their environments, such as nutrition and healthcare. Why might genetically identical twins have different phenotypes?  Any genes on the same chromosome could be linked genes, whereas only genes on sex chromosomes can be sex-linked genes.

Explanation:

Due to the effects of the environment, genetically identical twins might have different phenotype.

The qualities or visible characteristics of an organism are its phenotype. It depends on how the environment and the genotype, or genetic code, of the organism interact.

Although human monozygotic twins as well as other genetically identical species may share startling physical similarities, they frequently differ in key characteristics, such as complicated diseases. The effects of the environment have generally been blamed for this variance across organisms with essentially identical chromosomal DNA sequences.

Therefore, due to the effects of the environment, genetically identical twins might have different phenotype.

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Answer:

d.

Explanation:

Answer:

D!

Explanation:

A is not true! When big meteors fall into the ocean, they cause mega-tsunamis I think, which does a lot of damage.

B, no, Uranus does too.

C, I think this is untrue, red wavelength and reflects the blue the blue!

D, is so true! A lot of reliable sources on this one!

Sorry if I did any wrong, I haven't learn chemistry in school yet.

Answer:

Electrons

Explanation:

Cathode rays carry electronic currents through the tube. Electrons were first discovered as the constituents of cathode rays. J.J. Thomson used the cathode ray tube to determine that atoms had small negatively charged particles inside of them, which he called “electrons.”

The rays produced in a cathode tube are electrons which are present in the shells surrounding the nucleus of an atom.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

Chlamydia, gonorrhoeah, syphilis, and trichomoniasis

Explanation:

Answer:

The four examples of STIS

1) Among 0.10M hydrochloric acid or 0.10M acetic acid, the more acidic one is 0.10M hydrochloric acid;

2) For for 0.0010M hydrochloric acid or 0.010M acetic acid, the more acidic one is 0.010M acetic acid;

3) For 0.00010M hydrochloric acid or 0.0010M acetic acid,  it is 0.0010M acetic acid;

4) The percent ionization of  a) 0.10m hydrochloric acid is 100% b) 0.10m acetic acid is 1.8% c) 0.10m hydrochloric acid  is 100% d) 0.10m acetic acid  is 1.3% e)  0.10m hydrochloric acid  is 100% f) 0.10m acetic acid

is 1.3%.

As per the question, which is more acidic, 0.10M hydrochloric acid or 0.10M acetic acid, the answer is 0.10M hydrochloric acid. The higher the concentration of hydrogen ions (H+), the stronger the acid is. Hydrochloric acid ionizes completely in water and provides more H+ ions than acetic acid. However, acetic acid is a weak acid, and it only partially dissociates in water. Hence the concentration of H+ ions in acetic acid is less than the concentration of H+ ions in hydrochloric acid.

Similarly, for 0.0010M hydrochloric acid or 0.010M acetic acid, the answer is 0.010M acetic acid. Since this concentration is greater than 0.0010M hydrochloric acid, the concentration of H+ ions is more in acetic acid. Hence it is more acidic than hydrochloric acid.

For 0.00010M hydrochloric acid or 0.0010M acetic acid, the answer is 0.0010M acetic acid. For this, we again consider the concentration of H+ ions. The concentration of H+ ions in acetic acid is more than that in hydrochloric acid. Hence it is more acidic than hydrochloric acid.

Now let's calculate the percent ionization for each of the above solutions.

a) 0.10M hydrochloric acid:

Hydrochloric acid ionizes completely in water. Hence, the percent ionization is 100%.

b) 0.10M acetic acid:

The ionization constant for acetic acid \(CH_{3}COOH\)  is Ka = 1.8 × \(10^{-5}\)

\(CH_{3}COOH\) ⇌ \(CH_{3}COO^{-}\) + \(H^{+}\)

0.10                                        0.10-x                                      x

Initial concentration of \(CH_{3}COOH\) is 0.10M and the equilibrium concentration would be 0.10 - x and x for  \(CH_{3}COO^{-}\) and \(H^{+}\) respectively. Since the concentration of x is less than 5% of the initial concentration of acetic acid, we can assume that it is negligible. Hence, the percent ionization is (x/0.10) × 100% = 1.8%.

c) 0.0010M hydrochloric acid:

Hydrochloric acid ionizes completely in water. Hence, the percent ionization is 100%.

d) 0.010M acetic acid:

The ionization constant for acetic acid \(CH_{3}COOH\) is Ka = 1.8 × \(10^{-5}\)

\(CH_{3}COOH\) ⇌ \(CH_{3}COO^{-}\) + \(H^{+}\)

0.010                                        0.010-x                                      x

Initial concentration of \(CH_{3}COOH\) is 0.010 and the equilibrium concentration is 0.010 - x and x for \(CH_{3}COO^{-}\) and \(H^{+}\) respectively. Since the concentration of x is less than 5% of the initial concentration of acetic acid, we can assume that it is negligible. Hence, the percent ionization is (x/0.010) × 100% = 1.3%.

e) 0.00010M hydrochloric acid:

Hydrochloric acid ionizes completely in water. Hence, the percent ionization is 100%.

f) 0.0010M acetic acid:

The ionization constant for acetic acid\(CH_{3}COOH\) is Ka = 1.8 × \(10^{-5}\)

\(CH_{3}COOH\) ⇌ \(CH_{3}COO^{-}\) + \(H^{+}\)

0.0010                                        0.0010-x                                      x

Initial concentration of \(CH_{3}COOH\) is 0.0010 and the equilibrium concentration 0.0010 - x and x for \(CH_{3}COO^{-}\) and \(H^{+}\) respectively. Since the concentration of x is less than 5% of the initial concentration of acetic acid, we can assume that it is negligible. Hence, the percent ionization is (x/0.0010) × 100% = 1.3%.

Hence, the percent ionization of each solution is:a) 100%b) 1.8%c) 100%d) 1.3%e) 100%f) 1.3%.

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By using the definition of purity the amount of gold in the sample is 275.8 grams.

Since the given mass is in grams and we are asked to find the amount of gold in the sample, we can directly use the definition of purity, which is the mass of gold in the sample divided by the total mass of the sample. Let x be the amount of gold in grams. Then we can write:

purity = x / 275.8 g

Since the sample is pure gold, the purity is 100% or 1.00 in decimal form. Thus, we have:

1.00 = x / 275.8 g

Multiplying both sides by 275.8 g, we get:

x = 275.8 g

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Answer:

Option A

250 degrees Celcius

Explanation:

If 1046J of heat energy is added to water, the water will experience a rise in temperature, at a rate that is directly proportional to its specific heat capacity.

Mathematically, this can be seen as \(Q=C\Delta T\)

Where C = specific heat of water = 4.184 J/g • °C.

Q = heat energy = 1046 J

\(\Delta T =1046/4.148=250 degrees Celcius\)

Therefore, the increase in temperature that will be experienced, is for 250 degrees Celcius