what is the difference between exergonic and exothermic reactions?​

When you step on the scale, you might see a reading of 160 lbs, but in actuality, you might weigh 160.11111 pounds, that would be challenging to determine with a standard bathroom scale.

Describe scale.

 A fish's external body covering, specifically, consists of a tiny, flattened, stiff, and unmistakably delimited plate. B: A tiny, thin plate with mica scales that resemble the scales of a moth's wing.

A little weighing scale – what is it?

It is a compact weighing scale with an easy-to-read digital screen that is portable. It is a compact weighing scale with an easy-to-read computer indicator that is portable. It is a versatile scale that works well for weighing big goods in various locations.

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Answer:

41826.05 Calories

Explanation:

1 J = 0.239006 Calories

175 KJ

= 175 x 1000 J

= 175000 J

175000 J to Calories

= 175000 x 0.239006

= 41826.05 Calories

Answer: 41.8

Explanation:

Acellus verified ✅

Answer:

Path length is the overall distance traveled following the path of where the object travel. ... Displacement is the distance from the starting point of the object to its final point irregardless where it travels.

Answer:

Explanation:

Atoms are the building blocks of matter.

They are the smallest particles of an element that still have the element's properties.

All atoms are very small, but atoms of different elements vary in size.

Three main types of particles that make up all atoms are protons, neutrons, and electrons.

Runoff includes; rivers, streams, creeks, and lakes.

Runoff refers to water that flows on the surface of the ground. Run off usually occurs after a heavy storm and may be responsible for some cases of flooding.

Runoff flows into water bodies such as rivers, streams, creeks, and lakes. These are water bodies that receives runoff water.

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Answer: all of these

Methane is the unidentified gas since its molar mass is 16 g/mol.

When describing atomic masses and molecular masses, the Dalton (Da) or unified atomic mass unit (u) are two alternative units of mass that are frequently employed. It is known to be 1/12 the mass of a carbon-12 atom and is also referred to as "amu" in older.

We must be aware that a gas's molar mass directly relates to how long it takes to diffuse.

t1/t2 = √M1/M2

Let t1 equal the 1.50 minutes it takes for the combustible gas to disseminate. Let t2 equal the 4.73 minutes it takes for the bromine vapor to disperse.

M1 = the flammable gas's molar mass equals

160 g/mol is the molar mass of the bromine vapor, or M2.

replacing values.

1.50/4.73 = √M1/160

(1.50/4.73) ^2 = M1/160

0.1006 = M1/160

M1 = 0.1006 × 160

M1 = 16 g/mol

Methane is the gas in question.

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The amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

To find the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C, we can use the equation Q = mcAT.
First, we need to find the value of m, which is the mass of the water in grams. In this case, it is given as 200 grams.
Next, we need to find the value of AT, which is the change in temperature in degrees Celsius.

This can be calculated by subtracting the initial temperature from the final temperature, which gives us 60 C - 20 C = 40 C.
The specific heat capacity of water, C, is given as 4.18 Joules per gram per degree Celsius.
Now we can plug in the values into the equation:
Q = mcAT
Q = (200 g) x (4.18 J/g°C) x (40°C)
Q = 33,440 J
Therefore, the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

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Answer:

4.3 %

Explanation:

Trust me.

The volume = 309.04 ml

Given

Specific gravity=-1.28 and strength =24.7% by mass of H₂SO₄

mass 125g of ZnC0₃

Required

The volume of H₂SO₄ Solution

Solution

Reaction

ZnCO₃ + H₂SO₄ → ZnSO₄ + CO₂ + H₂O

mol of ZnCO₃(MW=125.4 g/mol) :

\(\tt mol=\dfrac{125}{125.4}=0.997\)

From equation, mol ZnCO₃ : H₂SO₄= 1 : 1 so mol H₂SO₄=0.997

mass of H₂SO₄ (MW=98 g/mol) :

\(\tt mass=mol\times MW=0.997\times 98=97.706~g\)

mass of solution :

\(\tt \dfrac{100}{24.7}\times 97.706=395.57~g\)

Volume of solution :(density of solution=1.28 g/ml for the reference substance is water(density=1 g/ml)

\(\tt V=\dfrac{395.57}{1.28}=309.04~ml\)

Answer: D.

Explanation:

Asexual reproduction requires only one parent, making it more efficient and take a shorter amount of time than sexual reproduction.

The property X is an extrinsic property.

The term extensive property refers to the type of property that depends on the amount of the substance present. We must recall that an intensive property does not in any way depend on the number or the amount of the substance present in the sample.

If we have a good look at the table that is being referred to here, we would see that the mass of the substance tends to increase as a certain un named property of the substance X is increasing. This implies that the property X is affected by the mass of the object which is the quantity of matter in the object. This gives us an idea that the property that we are referring to can not be an intrinsic  property since it varies with the mass of the substance that is under study as shown.

We can then conclude that the property X is an extrinsic property.

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Missing parts;

Carrie measured mass and another property, X, of three pure samples of the same compound. She recorded her data in the table. Which of the following best describes property X?

A. X  is an intensive property because it does not vary with the size of the sample.

B. X is an extensive property because it does not vary with the size of the sample.

C. X is an extensive property because it varies directly with the size of the sample.

D. X is an intensive property because it varies directly with the size of the sample.

Answer:

0.551 moles

Explanation:

To calculate the number of moles in 22 grams of argon, divide the mass by the molar mass:

Number of moles = Mass / Molar mass

Number of moles = 22 g / 39.95 g/mol

Number of moles ≈ 0.551 moles

Therefore, there are approximately 0.551 moles of argon in 22 grams of argon.

Answer:

The substance with the highest heat gives heat to the lowest temperature, equating both temperatures,

In this situation there is talk of giving up heat but not matter, it is here that the law of conservation of energy comes into play.

Explanation:

The law of conservation of energy talks about that energy is transformed and never lost between two substances or two bodies that interact with each other, these interactions can be heat exchanges, as in this example.

It is a salt formed from the potassium cation (K+) and the phosphate anion (H2PO4-). This salt is considered monobasic because it contains one replaceable hydrogen ion (H+).

KH2PO4 is actually potassium dihydrogen phosphate, not potassium phosphate monobasic. Potassium phosphate monobasic, or monopotassium phosphate, is correctly represented by the chemical formula KH2PO4. It is a salt formed from the potassium cation (K+) and the phosphate anion (H2PO4-). This salt is considered monobasic because it contains one replaceable hydrogen ion (H+).

On the other hand, potassium dihydrogen phosphate, or K2HPO4, is a different compound. It is formed from the potassium cation (K+) and the hydrogen phosphate anion (HPO4^2-). This compound is considered dibasic because it contains two replaceable hydrogen ions (H+).

Therefore, KH2PO4 is correctly identified as potassium phosphate monobasic, while K2HPO4 is potassium dihydrogen phosphate.

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Answer:  none of the above

Explanation: all are endothermic

Step 1 - Understanding what happens during a chemical reaction

During a chemical reaction, substances are transformed. The susbtances already present before the reaction are called reactants, whereas the susbtances formed by the reaction are called products:

A chemical reaction is a little bit like Lego playing: no new atom is created nor destroyed, they are just rearranged. This rearrangement is possible because the reactants' chemical bonds are broken, and new bonds are formed.

Step 2 - Finding the correct alternative

As we have seen in step 1, no new atoms are formed. The atoms are the same, they are just joined together in a different way.

Therefore, item a) is not correct.

Answer:

a because it help in protecting disease

The percent yield of CO₂ In the reaction CH₄ + 2O₂ → 2H₂O + CO₂ if 1600g of methane reacts with excess oxygen to produce 2200 is 67.5%.

To calculate the percent yield of CO₂ in the given reaction, we need to first calculate the theoretical yield of CO₂. This can be done by stoichiometric calculations using the balanced chemical equation:

CH₄ + 2O₂ → 2H₂O + CO₂

The molar mass of CH₄ is 16.04 g/mol. Therefore, 1600 g of CH₄ is equivalent to 100 moles of CH₄. According to the stoichiometry of the reaction, 1 mole of CH₄ produces 1 mole of CO₂. Therefore, the theoretical yield of CO₂ is also 100 moles.

The molar mass of CO₂ is 44.01 g/mol. Therefore, the theoretical yield of CO₂ in grams is 4401 g.

The actual yield of CO₂ given in the problem is 2200 g.

Therefore, the percent yield of CO₂ is:

Percent yield = (actual yield / theoretical yield) x 100%

Percent yield = (2200 g / 4401 g) x 100%

Percent yield = 0.499 x 100%

Percent yield = 49.9%.

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Answer:

Condensation

Explanation:

Zoe is quite keen to have noticed what we call condensation. Air contains many components, one of those being water vapor. Like how sugar is soluble in water, water can be said to be "soluble" in air. Water will evaporate into the air to a certain extent. The higher the temperature of the air, the more water the air can hold. If the air has more water that it can hold (potentially because of a temperature decrease), the extra water will come out of the air. Zoe's water bottle was cold, and because the air around Zoe's bottle had cooled down, the air can not hold as much water as it could when it was warm, so the air deposited the extra water in the form of liquid water onto the bottle, giving the illusion that her bottle was sweating.

The condensed structural formulas as a bond-line formula are given in the attachment:

1. (CH3)2CHCH2CH3

2. CH2=C(CH2CH3)2

3. CH3CHCICH2CH(CH3)2

A bond-line formula, also known as a line-angle formula or skeletal formula, is a shorthand representation of a molecule in which the carbon and hydrogen atoms are implied and only the bonds between the atoms are shown.

In this representation, each vertex or endpoint of a line represents a carbon atom, and each line segment represents a bond between two adjacent atoms. The hydrogen atoms are not shown explicitly, but are assumed to be attached to the carbon atoms to satisfy the valence requirements.

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Answer

D. 2Na + Cl₂ → 2NaCl and 0.2175 moles or 7.71 g

Explanation

Given:

Mass of sodium that reacts = 10 g

What to find:

To write the balanced equation then find the number of moles in the mass of chlorine Cl₂ required to react with 10 g of sodium.

Step-by-step solution:

Step 1: Write the balanced chemical equation between the sodium metal and chlorines.

2Na + Cl₂ → 2NaCl

Step 2: Convert the mass of sodium metal given to moles using the mole formula.

Molar mass of Na = 23.0 g/mol

Step 3: Determine the moles of Cl₂ using the moles of Na in step 2 and mole ratio from the equation in step 1.

From step 1; 2 mole of Na requires 1 mole of Cl₂

So, 0.4348 moles of Na will require

Step 4: Convert the moles of Cl₂ in step 3 to mass using the mole formula.

Molar mass of Cl = 34.453 g/mol

Therefore, the correct answer is:

D. 2Na + Cl₂ → 2NaCl and 0.2175 moles or 7.71 g

Answer:

Q8) True

Q9) First ionization energy

Q10) Metal oxides

Explanation:

A common property of group one elements (alkali metals) is their combination with water to form basic solutions. E.g 2K(s)+2H2O(l)→2KOH(aq)+H2​(g).

The distance of the outermost electron in the atom from the nucleus is inversely related to the first ionization energy. As the distance between the outermost electron and the nucleus in group 17 elements gets larger, the corresponding first ionization energies of elements in the group gets smaller.

Group 1 elements can combine with oxygen to give metal oxides. E.g  4K + O2 --> 2 K2O

Around 6.14 x \(10^{24}\) g of magnesium bromate has the same mass as 10.00 g of sodium bromite and the same amount of oxygen atoms.

Writing down the chemical formulas for magnesium bromate and sodium bromite is the first step in solving this issue. Next, we must determine the mass of magnesium bromate that has the same amount of oxygen atoms as 10.00 g of sodium bromite using the mole ratio.

The compounds' chemical formulae are as follows:

Bromate of magnesium: Mg (BrO3)2

Bromite of sodium: NaBrO2

The molar mass and Avogadro's formula can be used to determine how many oxygen atoms are present in 10.00 g of sodium bromite.

NaBrO2 has a molar mass of 102.89 g/mol.

10.00 g divided by 102.89 grammes per mole yields 0.097 moles.

The formula for the number of oxygen atoms in 0.097 mol is 0.097 mol x 2 mol O / 1 mol. O = 0.194 mol NaBrO2

In 10.00 g of NaBrO2, there are 1.17 x \(10^{23}\) oxygen atoms, which is equal to 0.194 mol x 6.022 x \(10^{23}\) molecules/mol.

Mg(BrO3)2 molecules each contain six oxygen atoms.

1.17 x \(10^{23}\) O atoms divided by 6 molecules' worth of Mg(BrO3)2 results in 1.95 x \(10^{22}\) molecules of Mg(BrO3)2.

1.95 x \(10^{22}\) molecules of Mg(BrO3)2 weigh 6.14 x \(10^{24}\) g when multiplied by the molecular weight of 314.70.

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Answer:

This is easy, first you just...

Explanation:

I lied I have no idea, good luck tho

0.766 mL volume of formic acid is needed to prepare the buffer.

What is volume of formic acid?

To calculate the amount of formic acid needed to prepare the buffer, we can use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

where pH is the desired pH of the buffer, pKa is the acid dissociation constant of the weak acid, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid.

First, we can rearrange the Henderson-Hasselbalch equation to solve for the ratio of [A-]/[HA]:

[A-]/[HA] = \(10^{(pH - pKa)}\)

[A-]/[HA] = \(10^{(4.75 - 3.74)}\)

[A-]/[HA] = 3.52

Next, we can use the fact that the sum of the concentrations of [A-] and [HA] must be equal to the total volume of the buffer solution times the total concentration of the buffer components:

[A-] + [HA] = (0.0500 L)(0.600 M + 0.3000 M)

[A-] + [HA] = 0.0450 mol

We can also express [A-] in terms of [HA] using the ratio we calculated above:

[A-] = 3.52[HA]

Substituting this into the previous equation, we get:

3.52[HA] + [HA] = 0.0450 mol

4.52[HA] = 0.0450 mol

[HA] = 0.00994 mol

Finally, we can use the molar mass of formic acid (46.03 g/mol) to calculate the volume of formic acid needed to prepare the buffer:

volume of formic acid = (0.00994 mol)(46.03 g/mol) / (0.600 mol/L)

volume of formic acid = 0.766 mL

Therefore, 0.766 mL of formic acid is needed to prepare the buffer.

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Answer:

Explanation: Liquid Chromatography  

I'm sorry if i'm wrong

The kinetic theory of matter states that all matter is made up of minute particles with space in between them that move randomly. The theory is based on the fact that matter is composed of small particles.

Based on the atoms of an ideal gas, KMT has five hypotheses:

1. Gases are made up of several molecules moving randomly and constantly in linear motion.

2. The volume of all the molecules is dwarfed by the volume of the gas as a whole.

3. Intermolecular forces are negligible.

4. The average kinetic energy of every molecule in the gas stays constant as long as the temperature stays constant. Molecular collisions are therefore entirely elastic.

5. The average kinetic energy of all molecules in a gas depends on its absolute temperature. This shows that at any temperature, gas molecules in equilibrium have the same average kinetic energy (but NOT the same velocity and mass).

The kinetic-molecular theory, a theory that characterizes the states of matter, is based on the presumption that matter is composed of small particles that are constantly in motion. The theory clarifies observed properties and behaviors of gases, liquids, and solids.

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Answer:

Nicotine

Explanation: