What are the answers to these?

The density of the chocolate, given the data is 11.15 g/cm³

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

The following data were obtained from the question:

The density of the chocolate can be obtained as follow:

Density = mass / volume

Density of chocolate = 633.6 / 568.176

Density of chocolate = 11.15 g/cm³

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Polyethylene differs from oil, grease, and wax in a way that polythene is a tough plastic while the wax or grease is brittle solid.

Polyethylene is a long chain of ethylene, C2H6, which are molecules attached end-to-end in generally a straight chain. Oils, greases, and wax are a mixture of multiple hydrocarbon molecules which randomly combined in more of a mixture. Because of the high molecular weight of polythene, it is a tough plastic while the wax or grease is brittle solid.

One major difference among polymers and small molecules or monomers are the characteristics which polymers exhibit. Polymers generally have higher viscosities, higher boiling points and can present improved mechanical strength over small molecules or monomers.

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Answer:

0.8 mph

Explanation:

36 cm         1 m              1 km          0.62 mi       60 sec       60 min         0.8 mi

---------- X ------------ X ------------- X -------------- X ------------ X -------------- =  -----------

  sec         100 cm      1000 m          1 km             min            1 Hr              Hr

The reaction between quicklime (calcium oxide, CaO) and water (H2O) to form hydrated lime (calcium hydroxide, Ca(OH)2) is an exothermic reaction.

It releases heat energy, which is why we feel hot when touching the container in which the reaction occurs.

The balanced chemical equation for this reaction can be written as follows:

CaO + H2O → Ca(OH)2

In this equation, one molecule of quicklime (CaO) reacts with one molecule of water (H2O) to produce one molecule of hydrated lime (Ca(OH)2).

The reaction proceeds as follows:

CaO + H2O → Ca(OH)2

Calcium oxide (CaO) is a strong base and reacts with water to form calcium hydroxide (Ca(OH)2). The reaction involves the transfer of hydroxide ions (OH-) from water to calcium oxide, resulting in the formation of calcium hydroxide.

During this process, energy is released in the form of heat. The exothermic nature of the reaction is due to the high enthalpy change associated with the formation of the calcium hydroxide product. The release of heat energy is what causes the container to feel hot when we touch it.

This exothermic reaction is commonly used in various applications, such as in construction materials, agriculture, and water treatment. The heat released during the reaction helps in the curing and hardening of materials and facilitates the production of hydrated lime for various industrial purposes.

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Answer:

5.0

Explanation:

Answer:

The correct answer would be D) chlorophylls.

Explanation:

Chlorophyll refers to the green pigment present in cyanobacteria and chloroplasts of plants and algae. It is the pigment which is able to absorb light which makes it an essential element for photosynthesis.

In an experiment comparing the tension bond strength of polymer latex modified mortar (portland cement mortar with added polymer latex emulsions) to that of unmodified mortar, the result was x.

To conduct this experiment, you would need to follow these steps:

1. Prepare the materials: Gather all the necessary materials, including polymer latex emulsions, portland cement, sand, water, and any other additives required for the mortar mixture.

2. Prepare the polymer latex modified mortar: Mix the portland cement, sand, water, and polymer latex emulsions according to the specified proportions. Ensure thorough mixing to achieve a homogeneous mixture.

3. Prepare the unmodified mortar: Mix the portland cement, sand, and water according to the specified proportions. Again, ensure thorough mixing for a consistent mixture.

4. Perform the tension bond test: Apply both the polymer latex modified mortar and the unmodified mortar onto separate test surfaces, such as concrete blocks or metal plates. Make sure the surfaces are clean and free from any contaminants.

5. Allow the mortar to cure: Let both the modified and unmodified mortar cure for a specific duration, following the manufacturer's instructions or established industry standards.

6. Test the bond strength: Use a tension bond strength test apparatus, such as a hydraulic or mechanical testing machine, to apply a force perpendicular to the bond interface of the mortar. Apply increasing force until the bond fails and records the maximum force required for bond failure in both cases.

7. Compare the results: Analyze the data obtained from the tension bond test for both the polymer latex modified mortar and the unmodified mortar. Determine the maximum force or stress required for bond failure in each case.

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Answer:

Explanation:

1).  Ca(NO₃)₂ + KI → CaI + K(NO₃)₂

    This equation is incorrect.

    When Ca⁺⁺ reacts with I⁻, final product is CaI₂

    And when K⁺ react with NO₃⁻, final product is KNO₃

    Hence the equation will be,

    Ca(NO₃)₂ + KI → CaI₂ + KNO₃

    Now we have to balance this equation.

     Ca(NO₃)₂ + 2KI → CaI₂ + KNO₃

                          ↓

     Ca(NO₃)₂ + 2KI → CaI₂ + 2KNO₃

2). Ca(NO₃)₂ + KOH → CaOH + K(NO₃)₂

    This equation is incorrect,

    Since the reaction of Ca⁺⁺ with OH⁻ gives the final product     Ca(OH)₂

    And final product of K⁺ and NO₃⁻ is KNO₃

    Therefore, the equation will be,

    Ca(NO₃)₂ + KOH → Ca(OH)₂ + KNO₃

    Now we will balance this equation by changing the coefficients of the      molecules until the number of atoms on both the sides become equal.

    Ca(NO₃)₂ + KOH → Ca(OH)₂ + 2KNO₃

                                ↓

     Ca(NO₃)₂ + 2KOH → Ca(OH)₂ + 2KNO₃

3). Ca(NO₃)₂ + Na₂C₂O₄ → CaC₂O₄ + 2Na(NO₃)₂

    This equation is incorrect,

    Since the reaction of Na⁺ and NO₃⁻ gives the final product    NaNO₃.

    Therefore, the correct equation will be,

    Ca(NO₃)₂ + Na₂C₂O₄ → CaC₂O₄ + 2NaNO₃

     This equation is in the balanced form.

Scientific theories are always testable. A theory may be changed as a result of new observations.

A scientific theory is a set of laws, facts and hypotheses that have a complete vision of an aspect of reality.

It is a proposed explanation for a set of observable phenomena.

It allows in this way to organize and understand the observations and to be able to predict or provoke other future observations.

Theories can be modified or improved as more information is collected.

That is, theories can continue to be tested indefinitely, and eventually rejected, if the tests lead to it.  

Therefore, a scientific theory is testable by using a research method.

As mentioned, any theory can be tested or rejected as more information is collected.

This information to prove or reject theories are interpretations of observable facts, which generates new statements or allows to accept those already included in the theory.

Then, a theory may be changed as a result of new observations.

Finally, scientific theories are always testable. A theory may be changed as a result of new observations.

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Answer:

testable & new observations

Explanation:

Answer:

no of moles = (mass) ÷ molar mass

you get the molar mass from the periodic table

n = 20.0g ÷ ( 149.09 g/mol )

= 0.134 mol

number of formula units = number of moles × (6.022×10^23)

= 8.07×10^22 units

number of hydrogen atoms in (NH4)3 PO3 = 12 × number of formula units

= 9.68×10^23 hydrogen atoms

Displacement is defined as the distance, in any direction, of an object relative to the position of another object. Physicists use the concept of a position vector as a graphical tool to visualize displacements. A position vector expresses the positionof an object from the origin of a coordinate system

Answer:

Pick a reference point on the line to be the zero position. Determine the direction and measure the distance from zero in standard units.

Explanation:

Answer:

B. Charges ( a slight positive charge on one end, and a slight negative charge on the other).

Yes. In essence, the resulting sticky, gelatinous substance is "napalm" created at home. Styrofoam fragments can be used to make it by dissolving them in gasoline or diesel.

Styrene is polymerized in benzene to create napalm under strictly regulated circumstances. In benzene, polystyrene dissolves in a viscous solution. the sticky oil is mixed with orange juice concentrate. The names napalm and palmitic acids refer to two substances that were used to create the oily gel in the original preparations. Liquid fuels burn rapidly, but adding a gel to them causes the fuel to burn with a hot, slow flame, causing it to burn with more damage to structures, plants, and, of course, people Styrofoam.

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Coenzymes such as NADH and FADH2 are used to carry electrons to and from many kinds of oxidation/reduction reactions.

What are coenzymes?

A macromolecule that catalyses a chemical process is an enzyme. In other words, it creates the possibility of a negative reaction. Smaller molecules are used to construct enzymes to create an active component. The coenzyme is one of an enzyme's most crucial components.

Small molecules make up coenzymes. They are unable to catalyse reactions on their own, but they can assist enzymes in doing so. Coenzymes are organic nonprotein molecules that join with the protein molecule (apoenzyme) to create the active enzyme, according to the technical definition (holoenzyme).

In biological oxidation-reduction reactions, NADH and FADH2 are two coenzymes that are extremely important. Along with the transfer of electrons, hydrogen ions also occur.

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Answer:

CnH2n-2 where n is the number of carbon atoms

Explanation:

for example :

pentayne

C5 H (5x2 -2 )

C5H8

Answer:

go for what ever brother GUESS / imagine this gate brainlyist for literally doing nothing.

Explanation:

The mass of a sample of NH₃ containing 3.80 × 10²⁴ molecules of NH₃ is the product of the number of moles and the molar mass of NH₃.

To find the mass of a sample of NH₃ containing 3.80 × 10²⁴ molecules of NH₃.

Step 1: Determine the number of moles of NH₃
We know that there are 6.022 × 10²³ molecules in one mole of any substance (Avogadro's number). To find the number of moles of NH₃, divide the given number of molecules by Avogadro's number:
Number of moles = (3.80 × 10²⁴ molecules) / (6.022 × 10²³ molecules/mol)

Step 2: Calculate the molar mass of NH₃
NH₃ consists of one nitrogen (N) atom and three hydrogen (H) atoms. The atomic mass of nitrogen is approximately 14 g/mol, and the atomic mass of hydrogen is approximately 1 g/mol. So the molar mass of NH₃ is:
Molar mass of NH₃= (1 × 14 g/mol) + (3 × 1 g/mol) = 14 + 3 = 17 g/mol

Step 3: Find the mass of the sample
Now that we know the number of moles and the molar mass, we can find the mass of the sample by multiplying the two values:
Mass of the sample = Number of moles × Molar mass of NH₃

The mass of a sample of NH₃ containing 3.80 × 10²⁴ molecules of NH₃ is the product of the number of moles (calculated in step 1) and the molar mass of NH₃ (calculated in step 2).

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Explanation:

leading zeros do not count as significant figures, Hence, this number correct to four significant figures should be written as in option E.

Answer:

QCl2

Explanation:

Q should belong to group 2 so valency is 2

R should belong to group 17 so valency is 1

Answer:

H2C2O1

Explanation:

Answer:

Carboxylic Acid

Ester

Ether

Alcohol

Explanation:

The compound that would form a precipitate in water is  BaSO4.

option d.

BaSO4 (barium sulfate) would form a precipitate in water because it is classified as an insoluble compound according to most solubility charts. When a compound is considered insoluble, it means that it has a very low solubility in water, resulting in the formation of solid particles or precipitate when dissolved in water.

In the case of BaSO4, it does not readily dissociate into ions in water and remains as solid particles, causing it to precipitate.

On the other hand, a. KCI (potassium chloride), b. NaOH (sodium hydroxide), and c. (NH4)2S (ammonium sulfide) are soluble compounds in water. They dissociate into ions and form homogenous solutions when dissolved in water, without forming a precipitate.

It's worth noting that solubility can vary depending on factors such as temperature and concentration, so it's always important to consult a solubility chart or reference for accurate and up-to-date information on specific compounds.option d.

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In regards to the question, it can be said that 25.7 g of solid methanol must be heated to its melting point to reach a temperature of

Q=2.6kJ

From the query, we learn

Determine the amount of heat needed to completely melt 25.7 g of solid methanol at its melting point.

In general, the mathematical formula for heat is

Q=N*u

Where

Methanol has a mass of 32.04g/mol.

Methanol's molar heat of fusion is 3200 J/mol.

How many moles are in 25.7g?

frac = 25.7g 32.04

n=0.8mol

Hence

at its melting point, 25.7 g of solid methanol needs to be heated to a temperature of

Q=0.8*3.2

Q=2.6kJ

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The minimum cation-to-anion radius ratio for a coordination number of 4 is 0.225.

What does coordination number 4 signifies?

When the coordination number is 4, tetrahedral geometry (109.5E bond angles) or square planar geometry (90 bond angles) are seen.

The ratio of a cation's lower ionic radius to its greater ionic radius is known as the radius ratio (anion). Radius ratio therefore equals

                    = rs/rl.

According to the given question:

We must demonstrate that the minimal cation-to-anion radius ratio for a coordination number of four is 0.225 in this scenario. A tetrahedron results by drawing lines from the anions' centres.

AB = 2rA

But

(AB)

2 = a2 + a2 = 2a2

or

AB = a√2 = 2rA

And

a = 2rA/√2

There will also be an anion located at the corner, point F (not drawn), and the cube

diagonal AEF will be related to the ionic radii as

AEF = 2 (rA + rC )

From the triangle ABF

(AB)² + (FB)² = (AEF)²

But,

FB = a = 2rA/√2 and AB = 2rA from above. Thus,

2rA² +  (2rA/√2)² =  2 (rA + rC )²

Solving for the rC/rA ratio leads to

rC/rA = (√6 − 2)/2 = 0.225

The minimum cation-to-anion radius ratio for a coordination number of 4 is 0.225.

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Explanation:

We are given different isotopes and we have to identify the number of protons and neutrons that are in the nuclueus of each atom.

a) Carbon-14:

By definition two isotopes are atoms that have the same atomic number but different mass number. The atomic number of an atom is equal to the number of protons of that atom, and the mass number is equal to the number of protons plus the number of neutrons.

atomic number = n° of protons

mass number = n° of protons + n° of neutrons

n° of protons = atomic number

n° of neutrons = mass number - n° of protons

n° of neutrons = mass number - atomic number

If two isotopes have the same atomic number but different mass number we can say that two isotopes have the same number of protons but different number of neutrons.

In we pay attention to carbon-14 we can look for its atomic number in the period table: 6. And its mass number is the one that we are given after the name of the element: 14.

n° of protons = atomic number = 6

n° of protons = 6

n° of neutrons = mass number - atomic number = 14 - 6

n° of neutrons = 8

b) Cobalt-60:

atomic number = 27 (from the periodic table)

mass number = 60

n° of protons = atomic number = 27

n° of protons = 27

n° of neutrons = mass number - atomic number = 60 - 27

n° of neutrons = 33

c) Gold-197:

atomic number = 79 (from the periodic table)

mass number = 197

n° of protons = atomic number = 79

n° of protons = 79

n° of neutrons = mass number - atomic number = 197 - 79

n° of neutrons = 118

d) Uranium-235:

atomic number = 92 (from the periodic table)

mass number = 235

n° of protons = atomic number = 92

n° of protons = 92

n° of neutrons = mass number - atomic number = 235 - 92

n° of neutrons = 143

Answer:

a) Carbon-14: n° of protons = 6 n° of neutrons = 8

b) Cobalt-60: n° of protons = 27 n° of neutrons = 33

c) Gold-197: n° of protons = 79 n° of neutrons = 118

d) Uranium-235: n° of protons = 92 n° of neutrons = 143

Answer:

A meter is 100 times larger then a centimeter

Answer:

2Al + 3H2SO4 → Al2(SO4)3 + 3H2

3mol H2SO4 produce 1 mol Al2(SO4)3\

Molar mass H2SO4 = 98 g/mol

Mass 3 mol H2SO4 = 98 g/mol * 3 mol = 294 g

Molar mass Al2(SO4)3 = 342 g/mol

294 g H2SO4 produce 342 g Al2(SO4)3

250 g H2SO4 will produce 250 g / 294 g * 342 g Al2(SO4)3 = 291 g Al2(SO4)3

Different hormones responsible for different emotions have different structures. Hormones are responsible for regulating different emotional states in humans, including love, fear, stress, and anxiety. Hormones have different structures that determine their function in the body. For example, cortisol has a more complex structure than adrenaline and noradrenaline, and it is responsible for controlling the body's stress response system.

Hormones are the chemicals produced by different glands in the body, including the pituitary gland, adrenal gland, and hypothalamus, among others. Hormones are responsible for various emotions, including love, stress, fear, and anxiety, among others. In this sense, hormones are critical in regulating the emotional state of individuals. Hormones, however, have different structures, depending on the type of hormone. The structures are essential in the determination of the hormone's function in the body, including the emotions they elicit.
The different hormones responsible for different emotions have different structures. For example, adrenaline and noradrenaline have similar structures and are responsible for eliciting the fight or flight response in humans. Adrenaline and noradrenaline are both produced by the adrenal gland. Another hormone that is responsible for stress is cortisol, produced by the adrenal gland. Cortisol has a more complex structure than adrenaline and noradrenaline and is responsible for controlling the body's stress response system.
The hormone oxytocin is responsible for love and social bonding. Oxytocin is produced in the hypothalamus and released into the bloodstream. It has a peptide structure and is responsible for eliciting the feeling of love and social bonding. The hormone dopamine, on the other hand, is responsible for the feeling of pleasure and reward. Dopamine is produced in the brain, and it has a similar structure to adrenaline and noradrenaline.

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Answer:

H2O

Explanation:

The answer is that they were were not based on evidence and experiment and that made alchemy unscientific in its practices.

Alchemy is an old practice that might be thought of as a forerunner of chemistry.

The term alchemy is derived from the Arabic al-kimiyya, which is derived from Greek. Alchemy's fundamental notions focus around the transformation of one substance into another, often transforming a basic metal like lead or iron into a "noble" metal like silver or gold

The alchemist's main ambitions were to find the Stone of Knowledge, the medium of Eternal Youth and Health, and metal transmutation.

To conclude with we can say Alchemy is based on magic and occultism rather than true investigation and facts. Many of the items in it have been utilised as fundamentals for certain chemistry, although the vast majority of them are wrong and inaccurate.

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