which two options are examples of chemical changes?
A. A shinny metal bar glows red and expands when heated.

B. white piece of paper turns black and gives off a smell when burned

C. When two clear colorless liquids are mixed together, a white solid forms

D. A white powder mixed with a clear, colorless liquid makes a solution that is also clear, colorless liquid

H, S8(monoclinic), as well as Methane are the appropriate responses (g). For these three chemicals, overall enthalpy of production is not zero.

Entropy is the quantity of inherent disorder within a substance, whereas enthalpy is the quantity of internal energy. Enthalpy is greater than 0 for water since it is equal for elemental compounds like hydrogen gas and gaseous oxygen (regardless of phase).

Enthalpy with internal energy vary primarily in that internal energy is the total of a system's both potential and kinetic energy, whilst enthalpy is indeed the heat absorbed is evolved through chemical processes that take place in a system.

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Answer:

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Answer:

A. H

H

Explanation:

Hope it helps :)

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71. The broad, painless, pink-gray, wart-like infectious lesions that may develop on the vulva, perineum, or anus in syphilis are called "condyloma lata."

72. In suspected syphilis infection, the term RPR stands for "Rapid Plasma Reagin." It is a blood test used to screen for syphilis.

73. The recommended dosage of Benzathine Penicillin in an adult in Zambia may vary depending on the stage and severity of the syphilis infection. It is best to consult local guidelines or a healthcare professional for the specific recommended dosage in Zambia.

74. The recommended drug for the treatment of gonorrhea when using syndromic management may vary depending on local guidelines and antibiotic resistance patterns. Commonly used antibiotics include ceftriaxone in combination with azithromycin or doxycycline.

75. The causative organism for chancroid is called "Haemophilus ducreyi."

76. The commonest type of HIV is "HIV-1."

77. The assertive, problem-solving approach to the identification and treatment of the patient's problems is called "clinical decision-making."

78. A tumor arising from the cells producing melanin is also known as "melanoma."

79. The type of sound described as drum-like, loud, and empty quality felt over a gas-filled stomach, intestine, or pneumothorax during percussion is called "tympany."

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The number of pears needed to make 240 baskets with apples can be determined by using the ratio of the components in the compound.

Each basket's compound is O4A3P2S6. Therefore, there are 3 pears, 2 oranges, and 6 strawberries for every 4 apples.

Divide 240 (the number of apples) by 4 to see how many pears are required (the number of apples in the compound). 240 apples may be used to make 60 baskets, therefore this gives us that number.

The total number of pears required is 180, which you can calculate by multiplying this number (60) by the number of pears in the compound, which is 3. Hence, 180 pears are required to construct 240 apple baskets.

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The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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Answer: A model would be useful because the model makes the concepts easier to understand.

Explanation:

Models are helpful tools in science education that can be used to enhance explanations, spark discussion, make predictions, provide visual representations of abstract concepts, and create mental models.

Answer:

V₂ = 453.125 mL

Explanation:

Given data:

Initial volume = 25.0 mL

Initial molarity = 1.45 M

Final molarity = 0.0800 M

Final volume = ?

Solution:

Formula:

M₁V₁  =    M₂V₂

Now we will put the values in formula.

1.45 M × 25.0 mL = 0.0800 M × V₂

V₂ =  1.45 M × 25.0 mL / 0.0800 M

V₂ = 36.25 M.mL / 0.0800 M

V₂ = 453.125 mL

Answer:

By observing the time between transits, we know the orbital period. Kepler's Third law can be used to determine the orbital radius of the planet if the mass of the orbiting star is known (R3=T2−Mstar/Msun, the radius is in AU and the period is in earth years)

hope this helps you out

Answer:

D. no definite shape or. definite volume

Explanation:

Gases do not have a definite shape or volume because the molecules in gases are very loosely packed, they have large intermolecular spaces and hence they move around. The particles of solid are closely packed and occupy less space while particles of gases are loosely packed and occupy the complete space available.

Answer:

I'm pretty sure they do that yeah

Explanation:

Answer:

2.4 H\(x^{2}\)

Explanation:

Answer:

B!! I know this is right because I took this test.

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If we add one or two hydrogen ions to a polyatomic ion that has a 3-charge, as the phosphate ion (PO₄3-), it will still be a polyatomic ion. (Three H+ would entirely cancel out the 3-charge, turning it into a neutral molecule and removing it from the category of polyatomic ions.

As a result, the carbonate ion has 2 more electrons than protons due to its negative charge. The doubly bonded oxygen in the carbonate ion is neutral, whereas each single bonded oxygen has a negative charge. This is the cause of the total charge of "-2," then.

An essential component of the atmosphere of stars like the Sun is the hydrogen anion.

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Cyclopropane is a group of answer choice a. chemically very reactive.

Cyclopropane is a cyclic alkane that consists of three carbon atoms bonded to each other to form a ring. Each carbon atom is bonded to two hydrogen atoms, giving the molecule the formula C3H6.

Cyclopropane is known to be chemically very reactive due to the presence of high ring strain in the molecule.

The bond angles in cyclopropane are 60°, which is much smaller than the ideal tetrahedral bond angle of 109.5°. This causes the bonds to be weaker and more reactive than those in other alkanes.

As a result, cyclopropane undergoes a variety of reactions, including ring-opening reactions and addition reactions with electrophiles.

It is also more prone to undergo combustion reactions than other alkanes. Overall, the high reactivity of cyclopropane makes it an important molecule in organic chemistry and a useful starting material for the synthesis of other compounds.

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a. The percentage relative uncertainty is 1.1 %

b. The absoulte uncertainty is ± 1.9

Since 91.3 (+-1.0) mM * (40.3 (+-0.2) mL) / (21.1 (+-0.2) mL) is in the form

R = A × B/C, the relative uncertainty is given by

ΔR/R = √[(ΔA/A)² + (ΔB/B)² + (ΔC/C)²] where

Substituting the values of the variables into the equation, we have

ΔR/R = √[(ΔA/A)² + (ΔB/B)² + (ΔC/C)²]

ΔR/R = √[(0.2 mM/91.3 mM)² + (0.2 mL/40.3 mL)² + (0.2 mL/21.1 mL)²]

ΔR/R = √[(0.002191)² + (0.004963)² + (0.009479)²]

ΔR/R = √[0.00000480 + 0.00002463 + 0.00008985]

ΔR/R = √0.00011928

ΔR/R = ± 0.0109

ΔR/R ≅ ±0.011

So, the percentage relative uncertainty % ΔR/R = ΔR/R × 100 %

= 0.011 × 100 %

= 1.1 %

So, the percentage relative uncertainty is 1.1 %

Since R = A × B/C where

So, R = A × B/C

= 91.3 mM × 40.3 mL/21.1 mL

= 3679.39 mMmL/21.1 mL

= 174.38 mM

≅ 174.4 mM

Now, the absoulte uncertainty in R, ΔR = ΔR/R × R

= ±0.011 × 174.4 mM

= ± 1.92

≅ ± 1.9

So, the absoulte uncertainty is ± 1.9

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A 0.00143 M  concentration of MnO4^- is not a reasonable solution .

The ions left in solution are Na^+ and NO3^-

Number of moles of calcium nitrate  = 100/1000 L × 1 = 0.1 moles

Since;

1 mole of sodium carbonate reacts with 1 mole of calcium nitrate  then 0.1 moles of sodium carbonate were used.

The claim of the student that the concentration of sodium carbonate is too low is wrong because the value was calculated from concentration  and volume of calcium nitrate  and not using the precipitate. If the filtrate is tested for conductivity, it will be found to conduct electricity because it contains sodium and NO3 ions.

2) In the reaction as shown, the MnO4^- ion was reduced.

The initial volume is 3.4 mL while the final volume is 29.6 mL.

Number of moles of MnO4^- ion = (29.6 mL - 3.4 mL)/1000 × 0.0235 M = 0.0006157 moles

0.0006157 moles of MnO4^- reacted with  0.0006157 moles ×  5 moles/ 2 moles

= 0.0015 moles

Number of moles of MnO4^-  = 0.00143 M × (29.6 mL - 3.4 mL)/1000

= 0.000037 moles

0.000037 moles of MnO4^- reacts with 0.000037 moles × 5 moles/ 2 moles

= 0.000093 moles

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The male scientists did not so much regard the study due to gender bias.

Gender biases refer to the systematic ways in which individuals and society tend to favor one gender over the other. These biases can manifest in many different ways, including in the workplace, education, healthcare, and politics.

It's important to note that these biases are not limited to men and women, and they can vary depending on the culture, community, and individual. Also, these biases are not limited to one gender, both men and women can hold biases towards the other gender. Gender biases can have a significant impact on individual's life, limiting their opportunities and opportunities for development.

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Answer:

Less favorably than .

Less important .

Explanation:

Answer:

ok

Explanation:

Answer:

B

Explanation:

Sorry if wrong, brainliest if right please

Answer: Industrial processes including mining and manufacturing historically have been leading causes of soil pollution. Industrial areas typically have much higher levels of trace elements and organic contaminants. This is due to intentional and unintentional releases from industrial processes directly into the environment, including to the soil, adjacent water bodies, and the atmosphere.

Explanation:

Answer:

C should be the answer

Explanation:

energy required to raise 1 gram of a sample by 1 kelvin or degree celsius

Answer:

C)

one, one

Explanation:

Answer:

7

Explanation:

Answer:

7 is your answer

YW! :)

Explanation:

water is watching over you

Answer:

it means the higher the water content in the air, the more moderate (less extreme) the climate is.

Answer:

a. True

Explanation:

Palmitic acid is the acid found in animals and plants. It is the saturated acid that contains fats. It is extracted from palm oil and from fat sources like butter, cheese, milk and meat. It is added in milk with low fat content to add Vitamin A in it. The fat content of palmitic acid is very high. excessive consumption of palmitic acid leads to heart diseases and life risks.

Hydroboration addition of borane to a compound across the double bond.

The reaction that is called hydroboration could be carried out with an alkene or an alkyne as the case maybe. In each case, the reaction involves the addition of borane to a compound across the double bond. The reaction could further proceed to produce an alkanol.

Let us restate that like most of the organic reactions, this reaction occurs in a sequence of steps and each step of the reaction has a way of bringing us closer to the end product of the entire steps of the reaction take in proper order

As shown in the image attached to this answer, the reaction was carried out in DMS in order to stabilize the borane. We have shown the borane to be a reactant as it adds across the double bond to yield the product.

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