Need a little help with this

Answer:

Temperature will revert to room temperature after the substance reacts fully. Heat energy flows between the chemical bonds of the added substance and water to the surroundings (elsewhere in the water, the beaker, a student's hand that touches the beaker).

Explanation:

Hot packs and cold packs eventually return to room temperature because of thermal equilibrium

Temperature is the degree of hotness or coldness of a body. We have to note that bodies often tend to attain thermal equilibrium with the surroundings. Hence heat flows from or to the body as required.

Hence, the need to attain thermal equilibrium with the  environment is the reason why hot packs and cold packs eventually return to room temperature.

Learn more about thermal equilibrium: https://brainly.com/question/1301963

The negative impact of the hydroelectric dam is local drought and massive flood by dam breakage.

The hydroelectric dam is the local water storage body that is used to convert the energy of the water to electrical energy. The plants are a huge source of electricity.

The dam is prepared in order to collect the local water in the bodies for the production of electricity. The collection of water required a larger force and pressure-bearing ability, thus dams are constructed with high-quality material.

The dams provide hydroelectricity, but the collection of water has been caused by the local drought conditions in the area. The dam breakage leads to massive floods as well.

Learn more about hydroelectric dam, here:

https://brainly.com/question/25761749

Answer:

P2 = 1.94 kPa

Explanation:

Given the following data;

Initial pressure = 2.36 kPa

Initial temperature = 62°C

Standard temperature = 0°C

Conversion:

Kelvin = 273 + C

Kelvin = 273 + 62 = 335 K

Kelvin = 273 + 0 = 273 K

To find the final pressure, we would use Gay Lussac's law;

Gay Lussac states that when the volume of an ideal gas is kept constant, the pressure of the gas is directly proportional to the absolute temperature of the gas.

Mathematically, Gay Lussac's law is given by;

\( PT = K\)

\( \frac{P1}{T1} = \frac{P2}{T2}\)

Making P2 as the subject formula, we have;

\( P_{2}= \frac{P1}{T1} * T_{2}\)

\( P_{2}= \frac{2.36}{335} * 273 \)

\( P_{2}= 0.0071 * 273 \)

P2 = 1.94 kPa

The Cl-C-Cl bond angle in the CCl2O molecule (with carbon as the central atom) is slightly less than the ideal tetrahedral angle of 109.5 degrees. It is reduced to around 105 degrees due to the presence of two lone pairs on the oxygen atom. This distortion occurs because lone pairs exert greater electron repulsion compared to bonded pairs, resulting in a compressed bond angle.

The CCl2O molecule consists of a central carbon atom (C) bonded to two chlorine atoms (Cl) and one oxygen atom (O). In an ideal tetrahedral arrangement, the bond angle between the three atoms connected to the central atom would be 109.5 degrees. However, in the case of CCl2O, the presence of two lone pairs on the oxygen atom causes electron repulsion, which affects the bond angles.

Lone pairs of electrons occupy more space around the central atom than bonded pairs, and they exert greater repulsion. This repulsion pushes the chlorine atoms closer together, reducing the Cl-C-Cl bond angle. As a result, the bond angle in CCl2O is slightly less than the ideal tetrahedral angle, typically around 105 degrees. The presence of lone pairs on the oxygen atom introduces an asymmetry in the molecule, leading to the distortion in the bond angles from the ideal geometry.

To learn more about tetrahedral arrangement, refer:

brainly.com/question/23454455

#SPJ11

Answer:

Leg swings sounds good but not to sure

Explanation:

I mean in order to play basketball gotta warm up your legs

Answer: Leg swings

Explanation: Leg swings would be best for preparing to sprint because you will have to move you legs very quickly, and leg swings would be a good warm up without tiring yourself out.

The notation for the enthalpy of the solution is ∆Hsol. The correct answer is option ∆Hsol.

For more questions on enthalpy

https://brainly.com/question/14047927

#SPJ8

Answer:

Decomposition reaction

Explanation:

2PbO2 → 2PbO + O2

2PbO2 is reactant.

2PbO + O2 is the product.

Definition : -

Decomposition reaction is a chemical reaction in which a single reactant breaks down to simpler products.

The partial pressure of helium in the flask is 1.12 atm and the total pressure in the flask is 1.99 atm.

To find the partial pressure of helium, we need to first find the moles of each gas present in the mixture.

Moles of methane:

n(CH4) = mass / molar mass = 2.68 g / 16.04 g/mol = 0.167 mol

Moles of helium:

n(He) = mass / molar mass = 0.864 g / 4.00 g/mol = 0.216 mol

Total moles of gas:

n(total) = n(CH4) + n(He) = 0.167 mol + 0.216 mol = 0.383 mol

To find the total pressure in the flask, we can use the ideal gas law:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin. Rearranging this equation to solve for P:

P = nRT / V

where R = 0.0821 L·atm/mol·K is the gas constant.

Converting temperature to Kelvin:

T = 65°C + 273.15 = 338.15 K

Plugging in the values:

P = (0.383 mol) x (0.0821 L·atm/mol·K) x (338.15 K) / (5.93 L) = 1.99 atm

To find the partial pressure of helium, we can use the mole fraction of helium:

X(He) = n(He) / n(total) = 0.216 mol / 0.383 mol = 0.563

The partial pressure of helium is then:

P(He) = X(He) x P = 0.563 x 1.99 atm = 1.12 atm

Learn more about partial pressures at: https://brainly.com/question/19813237

#SPJ1

The complete conversion of three moles of glucose by aerobic fermentation yields 6 moles of acetic acid.

Generally, aerobic fermentation or aerobic glycolysis is defined as a metabolic process by which cells metabolize sugars via the process of fermentation in the presence of oxygen and occurs through the repression of normal respiratory metabolism. This method is referred to as the Crabtree effect in yeast and also it is a part of the Warburg effect in tumor cells.

Generally, Reaction 1 of aerobic fermentation shows that 1 mole of glucose is converted to 2 moles of ethanol. And those 2 moles of ethanol are then converted in the Reaction 2 of aerobic fermentation into 2 moles of acetic acid. Hence, the complete conversion of glucose yields two acetic acid molecules per glucose molecule. Also, given that the ratio, when completely converted, three moles of glucose will yield six moles of acetic acid.

Learn more about aerobic fermentation from the link given below.

https://brainly.com/question/3928558

#SPJ4

The hydrogen-oxygen bond is ionic 3 because to the difference in electronegativity.

The capacity of such an atom to draw protons (or electronic structure) to itself is measured by its electropositive. It controls the distribution of the shared energy between two molecules in a bond. The bigger an atom's electropositive, the more aggressively it will draw electrons from its bonds.

The capacity of an element to draw electron density in a covalent connection is referred to as electron affinity. The stronger a material attracts other shared electrons, the greater its degree of electronegativity.

To know more about Electronegativity visit:

https://brainly.com/question/17762711

#SPJ4

Answer:

Mass: 981.0 g

Density: 5.61 g/cm^3

Hardness: = 2.5 - 3

Unknown material: Chalcocite

I just got a 100 on the test ^ so that is right

Answer:

Universe, galaxy, solar system, star, planet, moon and asteroid.

Explanation:

You're welcome!

The grams of magnesium hydroxide will precipitate if the 25 mL of 0.235 M magnesium nitrate are combined with the 30. 0 mL of 0.260 M potassium hydroxide is 0.227 g.

The reaction is given as :

Mg(NO₃)₂   +   2KOH  ---->  2KNO₃(aq)  +  Mg(OH)₂(s)

moles of Mg(NO₃)₂   = 0.235 × 0.025

                                  = 0.00587 mol

moles of KOH = 0.260 × 0.030

                        =  0.0078 mol

1 mole of Mg(NO₃)₂   react with 2 mole of KOH

mole of KOH = 0.0078 × 2

                      = 0.0156 mol

KOH is the limiting reagent.

2 mole of KOH  produces 1 mole of Mg(OH)₂

mole of Mg(OH)₂ =  0.0078 / 2 = 0.0039 mol

mass of Mg(OH)₂ = 0.0039 × 58.3

                             = 0.227 g

To learn more about moles here

https://brainly.com/question/26416088

#SPJ4

The molar concentration of magnesium nitrate in the solution is 0.0350 M.

We can start by calculating the number of moles of magnesium nitrate:

moles of Mg(NO₃)₂ = mass / molar mass

= 0.17 g / (24.305 g/mol + 2x14.007 g/mol + 6x16.00 g/mol)

= 0.00105 mol

Next, we can calculate the molarity (M) of the solution using the formula:

M = moles of solute / volume of solution (in liters)

First, we need to convert the volume from milliliters (mL) to liters (L):

30.0 mL = 0.0300 L

Now we can plug in the values:

M = 0.00105 mol / 0.0300 L

= 0.0350 M

To know more about magnesium nitrate, here

brainly.com/question/28519426

#SPJ1

Answer:

gAIN

Explanation:

By drawing the resonance structures of nitromethane and methyl nitrite, you can determine that the N-O bond length in methyl nitrite is shorter than in nitromethane due to the partial double bond character in methyl nitrite.

Nitromethane (CH3NO2) and methyl nitrite (CH3ONO) share the same empirical formula. By drawing the resonance structures of these two molecules, you can obtain information regarding the N-O bond length.
For nitromethane (CH3NO2), there is only one resonance structure, with a single bond between the nitrogen and oxygen atom. This single bond results in a longer N-O bond length.

For methyl nitrite (CH3ONO), there are two resonance structures. In one structure, there is a double bond between the nitrogen and oxygen atom, and in the other structure, there is a single bond between the nitrogen and oxygen atom. The true structure of methyl nitrite is a combination of these two resonance structures, resulting in a partial double bond character and a shorter N-O bond length compared to nitromethane.

In conclusion, by drawing the resonance structures of nitromethane and methyl nitrite, you can determine that the N-O bond length in methyl nitrite is shorter than in nitromethane due to the partial double bond character in methyl nitrite.

To know more about bond length, refer

https://brainly.com/question/16012396

#SPJ11

Answer:

NaOH

Explanation:

Looking at a periodic table, sodium is Na, oxygen is O and hydrogen is H

If we have a compound containing 1 atom of sodium (Na), 1 atom of oxygen(O) and 1 atom of hydrogen(H) the formula would be NaOH

Potential Energy is the form of energy contained in dam.

Total energy:

The total energy of each considered object is the sum of its potential energy (P.E) and kinetic energy (K.E) and is constant throughout motion. For example, at finite height, a ball has maximum potential energy and zero kinetic energy, and when released, K.E increases and becomes maximum at ground level, and P.E decreases to zero at ground level. , so the total energy increases. There is movement of the ball in the same way everywhere. The energy that an object has due to its motion is called kinetic energy, and the energy that an object has due to its position and shape is called potential energy.

Here the water dammed by the dam has a certain potential height. This means that water has latent energy because it is located far from the bottom. Therefore, water dammed up by a dam has potential energy.

Potential Energy:

In physics, potential energy is the energy possessed by an object due to its position relative to other objects, its own tension, electrical charge, or other factors. Common types of potential energy are the gravitational potential energy of a body, the elastic potential energy of an extended spring, and the electrical potential energy of an electric charge in an electric field. The unit of energy in the International System of Units (SI) is the joule, and the symbol is J.

Learn more about Potential Energy:

https://brainly.com/question/24284560

#SPJ4

The correct answer is:Only statements 1 and 2 are correct.

1) The bond is planar.

2) There is free rotation about the carbonyl carbon and nitrogen bond.

The bond is planar: True, Peptide bond is a planar bond because it is composed of a double bond between the carbonyl carbon and nitrogen, and the atoms on either side of the double bond are sp2 hybridized. There is free rotation about the carbonyl carbon and nitrogen bond: True, the peptide bond between amino acids in a protein is a single bond, which allows for rotation about the bond, this is one reason proteins can adopt many different conformations.There is substantial double-bond character to this bond: False, the peptide bond is actually a single bond, although it has some double-bond character, it is not a double bond.There is a net negative charge on nitrogen and net positive charge on oxygen: False, both nitrogen and oxygen atoms in a peptide bond are neutral, as there is no charge separation in the bond.

To learn more about typical peptide here:

https://brainly.com/question/15578006

#SPJ4

Answer:

Lose 2 electrons

Explanation:

Rutherford conclusion was: Inside of the gold atom consists of empty spaces.

Rutherford theorized that atoms have their charge concentrated in a very small nucleus.

This was famous Rutherford's Gold Foil Experiment: he bombarded thin foil of gold with positive alpha particles (helium atom particles, consist of two protons and two neutrons).

Rutherford observed the deflection of alpha particles on the photographic film and notice that most of alpha particles passed straight through foil.

That is different from Plum Pudding model, because it shows that most of the atom is empty space.

More about Rutherford model: brainly.com/question/6708627

#SPJ4

Answer:

Alright the very first thing you need to do is balance the equation:

2HCl + Na2CO3 -----> 2NaCl + CO2 + H2O

Now we need to find the limiting reactant by converting the volume to moles of both HCl and Na2CO3.

Volume x Concentration/molarity = moles

0.235L x 0.6 M = 0.141 moles / molar ratio of 2 = 0.0705 moles of HCl

0.094L x 0.75 M = 0.0705 moles /molar ratio of 1  = 0.0705 moles of Na2CO3

Since both of the moles are equal, it means the entire reaction is complete (while the identification of limiting reactant may seem like an unnecessary step, it's quite essential in stoichiometry, so keep an eye out) and there is no excess of any reactant.

Now we know that the product we want to calculate is aqueous so, following the law of conservation of mass, we should add both volumes together to calculate how much volume we could get for NaCl.

0.235 + 0.094 = 0.329L of NaCl

Now we apply the C1V1 = C2V2 equation using the concentration and volume of Na2CO3 because it's molar ratio is one to one to NaCl (You can also use HCL, but you have to divide their moles by 2 for the molar ratio)  and the volume we just calculated for NaCl.

(0.75M) x (0.094L) = C2 x (0.329L)

Rearrange equation to solve for C2:

(0.75M) x (0.094L)  =  C2

    (0.329L)

C2 = 0.214 M (Rounded)

When the reaction is finished, the NaCl solution will have a molarity concentration of 0.214 M.

Answer:

.

Explanation:

When the salad dressing (consisting of water, oil, and vinegar) is thoroughly shaken, it is an example of a heterogeneous mixture, and not of a mixture of elements, a molecular compound or a homogenous mixture.

Water is a compound, while vinegar and oil are mixtures of compounds, so their mixture cannot possibly be a mixture of elements (option a) is eliminated). No new compound is formed upon their mixing, so it is not a molecular compound (eliminating option c)). The mixture of oil, vinegar, and water remains heterogeneous even when shaken, so option b) homogenous mixture is eliminated, with option d) heterogenous mixture remaining as the only possible option.

You can learn more about heterogenous mixtures here:

brainly.com/question/24898889

#SPJ4

The pH of the coffee is 4. To find the pH of the coffee, we first need to use the formula: pH = -log[H⁺], where [H+] is the concentration of hydrogen ions in the solution. However, the problem gives us the concentration of hydroxide ions ([OH⁻]), not hydrogen ions.

To get the concentration of hydrogen ions, we need to use the equation: Kw = [H⁺][OH⁻], where Kw is the ion product constant of water (1.0 x 10⁻¹⁴ at 25°C).
Rearranging this equation to solve for [H⁺], we get: [H⁺] = Kw/[OH⁻] = (1.0 x 10⁻¹⁴)/1.0 x 10⁻¹⁰ = 1.0 x 10⁻⁴ M.
Now we can use this value to find the pH of the coffee: pH = -log[H⁺] = -log(1.0 x 10⁻⁴) = 4.

Therefore, the pH of the coffee is 4.

To know more about pH, refer

https://brainly.com/question/172153

#SPJ11

Thermoluminescence can date sediments and rocks directly

Radiocarbon dating, also known as carbon-14 dating, is a technique used to estimate the age of carbon-containing materials that have been preserved in the last 50,000 years. It is widely used in geology, archaeology, and paleontology.The theory behind carbon dating is straightforward: living organisms absorb carbon from their environment and use it to create new organic compounds. Carbon-14 is a radioactive isotope of carbon that is absorbed by organisms at the same rate as ordinary carbon. Carbon-14 decays at a constant rate, and measuring the amount of carbon-14 in a sample can provide an estimate of how long it has been since the organism died or the carbon-containing material was formed.

Thermoluminescence (TL) dating, on the other hand, is a technique used to date sediments and rocks directly. It is based on the fact that when rocks are heated, they emit light energy. This light energy is trapped within the crystal structure of the rock, and over time, it accumulates. By measuring the amount of light energy trapped within a sample, scientists can estimate how long it has been since the sample was last heated.

Learn more about radiocarbon dating : https://brainly.com/question/11397015

#SPJ11