HELP PLEASE!!!! 15 POINTS!!! HELP!!
In order to make a cold pack, do you want to use a chemical that absorbs energy or release energy?

Answer:

It might be B

Explanation:

because its HClO2

Answer:

300N

Explanation:

Mass = 100kg

Acceleration = 3m/s²

Force = mass × acceleration

F = ma

Force = 100 × 3

Force = 300N

The force required to move 100kg of barbell with an acceleration of 3m/s² is 300N

To find the number of moles in 108 grams of water, divide the given mass by the molar mass of water, which is 18.02 grams per mole. The number of moles is 6.

To determine the number of moles in 108 grams of water (H2O), we can use the molar mass of water as a conversion factor. The molar mass of water is 18.02 grams per mole. So, to find the number of moles, divide the given mass by the molar mass:

Number of moles = Mass of water / Molar mass of water

Number of moles = 108 g / 18.02 g/mol

Number of moles = 6 moles.

Answer:

You see things happen much sooner than you hear them.  

Explanation:

Light travels about a million times as fast as sound.

When the ball hits the bat , it will take about a million times longer to hear the crack of the bat than to see it.

What you see is almost instantaneous.

There will be a delay until you hear the sound.

Answer:

Gene disorders require the inheritance of a defective gene from each parent

Answer:

the ph is 13.54

ur welcome

Explanation:

Based on the data provided, the pH of the H2SO4 solution is 1.62

The pH of a solution is the negative logarithm to base ten of the hydrogen ions concentration of the solution .

Mathematically, pH = - log [H+]

The pH is calculated from the molarity of the solution.

number of moles of H2SO4 = 3.25/98.08 = 0.0331 moles

Molarity of the H2SO4 solution = 0.0331/2.75 = 0.012 M

Since H2SO4 us a diprotic acid, [H+] = 2 × 0.012 = 0.024

Then;

pH = -log(0.024)

pH = 1.62

Therefore, the pH of the H2SO4 solution is 1.62

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Answer:

∇T = -32°C

Explanation:

T1 = 45°C

T2 = 13°C

∇T =?

∇T = change in temperature = final temperature - initial temperature

∇T = T2 - T1

∇T = 13 - 45

∇T = -32°C

The change in temperature is -32°C

Answer:

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Answer:

The correct answer to the following question will be Option E (1.0 x 10⁻³ M).

Explanation:

The given values are:

[tex]A\lambda =140[/tex]

[tex]\varepsilon=1.36\times 10^5 \ M \ {cm^{-1}}[/tex]

L = 1 \ cm

As we know,

⇒  [tex]A\lambda=\varepsilon CL[/tex]

On putting the given values in the above formula, we get

⇒  [tex]140=1.36\times 10^5\times C\times 1[/tex]

⇒  [tex]C=\frac{140}{1.36\times 10^5}[/tex]

⇒  [tex]C=102.9\times 10^{-5} \ M[/tex]

So that option E is the right answer.

The concentration of a Beta-carotene solution with an absorbance of 140 at a path length of 1 cm is calculated as approximately 1.0 x 10⁻³ M using the Beer-Lambert law.

The question is asking for the concentration of a Beta-carotene solution based on its absorbance at a wavelength of 490 nm using the Beer-Lambert law. According to the Beer-Lambert law, absorbance (A) is equal to the molar absorptivity () times the concentration of the solution (c) times the path length (b):

A = c b

Given the values:

Absorbance (A) = 140

Molar absorptivity () = 1.36 x 105 M⁻¹cm⁻¹

Path length (b) = 1 cm

We can rearrange the equation to solve for concentration (c):

c = A / (b)

Plugging in the given values:

c = 140 / (1.36 x 105 x 1)

Concentration (c) = 1.0294117647 x 10⁻³ M, which can be approximated to 1.0 x 10⁻³ M based on the given options.

Hence, the concentration of Beta-carotene solution with an absorbance of 140 at a path length of 1 cm is 1.0 x 10⁻³ M.

Options:

Answer: NaOH (aq)

Explanation:

Defining state terminologies, 'aq' means aqueous, meaning the analyte is in solution, as opposed to gaseous (g), or liquid (l).

In mathematics, a solution typically refers to the numeric value(s) that satisfy an equation or inequality. For example, in the equation 'x + 3 = 7', the solution is x = 4. In a quadratic equation 'ax^2 + bx + c = 0', the solution(s) for x can be found using the quadratic formula x = [-b ± sqrt(b^2 - 4ac)] / 2a.

The term 'solution', in the context of mathematics, typically refers to the process of determining the values that satisfy an equation or inequality. In the most simplistic cases, a 'solution' represents a numeric value that, when substituted into the equation, equates both sides. For instance, in the equation 'x + 3 = 7', the solution would be x = 4. This is because substituting x = 4 into the equation yields a true statement (4 + 3 does indeed equal 7).

In a more complex scenario, such as the quadratic equation 'ax^2 + bx + c = 0', you would use the quadratic formula x = [-b ± sqrt(b^2 - 4ac)] / 2a to find the solution(s) for x.

However, it should be noted that not all formulas are 'solutions'. Some formulas might represent a general principle or pattern, rather than a specific solution to an equation.

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Answer:

The correct answer to the following question will be Option B (temperature of the water).

Explanation:

Final answer:

The solubility of a salt in water is primarily determined by the temperature, with most solutes having increased solubility at higher temperatures. This greatly influences the maximum amount of solute that can dissolve, making temperature a key factor in solubility. The correct answer is B.

Explanation:

The solubility of a salt in a given volume of water depends primarily on the B) temperature of the water. This is because solubility is significantly influenced by temperature, with most solid or liquid solutes having their solubility increased with rising temperature. The solubility of sodium chloride, for example, is 36.0 g per 100 g of water at 20°C, underscoring the need to specify temperature when discussing solubility. While surface area affects the rate of dissolution and stirring can increase the rate of solute-solvent collisions, it is the temperature that primarily determines the maximum amount of solute that can dissolve. Pressure, on the other hand, has a prominent effect on the solubility of gases rather than salts in water.

Answer:

Covalent Compound

Explanation:

Answer via Founder's Education/ Educere

P3F4 is a covalent compound , therefore option (c) is correct.

A covalent bond is a chemical bond in which pairs of electrons are shared between two atoms. The covalent bond is also called a molecular bond.

The forces of attraction or repulsion between two atoms, when they share electron pair or bonding pair, is called as Covalent Bonding.

Covalent bonding occurs between non-metal elements when pairs of electrons are shared by atoms.

Atoms will covalently bond with other atoms to attain the nearest noble gas electron configuration.

P3F4 is a covalent compound ,  hence option (c) is correct.

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Answer:

B

Explanation:

Since we want to find the volume of CO, but we're given Nickel's mass, we need to convert grams of Nickel to moles then convert that to moles of CO using stoichiometry from the balanced reaction.

The molar mass of Nickel is 58.69 g/mol:

[tex]18.9 g Ni *\frac{1mol}{58.69gNi} =0.322molNi[/tex]

From the reaction, we can see that each mole of Nickel is 4 moles of CO, so to find the number of moles of CO from 0.322 moles of Nickel, multiply 0.322 by 4: 0.322 * 4 = 1.29 mol CO

Now, we can use the ideal gas law, PV = nRT, to find the volume of CO:

- the pressure P is 2.99 atm

- the volume is what we want to find

- the moles n is 1.29 mol CO

- the gas constant R here would be 0.08206 L atm / (mol K)

- the temperature T is 340.°C + 273 = 613 K

Plug all these values in:

PV = nRT

(2.99 atm) * V = (1.29 mol) * (0.08206) * (613 K)

V ≈ 21.7 L

The answer is B

It showed that the richest Harappan citizens had excess food to trade or sell. It showed that Harappa could store excess food to save, sell, or trade with others.

Carbon dioxide is a greenhouse gas that has increased global warming. The carbon dioxide emissions can be reduced by planting more trees to absorb carbon dioxide. Thus, option B is correct.

Carbon dioxide is a greenhouse gas present in the atmosphere and plays an important role in absorbing UV radiation. The increased carbon emissions due to pollution and deforestation have led to an increase in the temperature of the planet. This has resulted in climate change due to global warming.

This effect of carbon emission can only be reduced if more plantation is done to soak up the carbon present in the atmosphere. Plants take carbon dioxide from the surroundings to produce food and oxygen and can help reduce global warming and pollution.

Therefore, option B. more plantations can decrease carbon emissions.

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The best option for reducing carbon dioxide emissions among those provided is B. Planting more trees. Trees act as a carbon sink and absorb CO₂, aiding in the reduction of atmospheric carbon levels.

Among the options provided for reducing carbon dioxide emissions, the correct choice is B. Planting more trees. Trees absorb carbon dioxide from the atmosphere during the process of photosynthesis, which helps to reduce overall concentrations of this greenhouse gas. Additionally, measures such as burning less fossil fuels and increasing carbon sinks like forests can further help remove CO₂ from the atmosphere. However, other options such as generating electricity from coal, which is more carbon-intensive than oil, or cutting down trees would increase carbon emissions rather than reduce them.

To effectively reduce CO₂ emissions, reducing deforestation, increasing afforestation and reforestation, and shifting to cleaner energy sources like solar, wind, and biomass are also crucial strategies. These actions, combined with policies like capping emissions and promoting sustainable agricultural practices, can significantly lower the atmospheric concentration of carbon dioxide.

Answer:

Pressure of the Oxygen gas collected over water at 23.5°C = 728.35 mmHg = 0.958 atm

Explanation:

The gas collected over water will mix with water vapour.

The total pressure of the setup is then a sum of the partial pressure of the gas collected over the water and the vapour pressure of water at the temperature given.

Total Pressure = (Partial Pressure of Oxygen) + (Vapour Pressure of water at 23.5°C)

Total Pressure = 750 mmHg

Partial Pressure of Oxygen = ?

Vapour Pressure of water at 23.5°C = 21.6472 mmHg from literature

750 = (Partial Pressure of Oxygen) + 21.6472

Partial Pressure of Oxygen = 750 - 21.6472 = 728.3528 mmHg = 0.958 atm

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Potassium Nitrate (KNO3) is a potassium compound containing both ionic and covalent bonds. The bond between K+ and NO3- is ionic while the bonds within the nitrate ion are covalent.

An example of a potassium compound containing both ionic and covalent bonds is potassium nitrate (C). In potassium nitrate (KNO3), the bond between the potassium ion (K+) and the nitrate ion (NO3-) is ionic. Within the nitrate ion itself, the bonds between the nitrogen atom and the oxygen atoms are covalent.

Ionic bond forms when one atom transfers one or more electrons to another atom; in this case, potassium (K) transfers one electron to nitrate (NO3) ion. Covalent bond on the other hand occurs when two atoms share electrons, as seen in the bonding between nitrogen (N) and oxygen (O) atoms within the nitrate ion (NO3).

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Answer:

0.5 mol.

Explanation:

Given,

Pressure, P = 101.325 kPa = 1 atm

Temperature, T = 0 +273 = 273 K

Volume = 11.2 L

Now, using ideal gas equation

PV = n RT

1 x 11.2 = n x 0.08206 x 273

n = 0.5 mol.

Hence, number of moles of the hydrogen sample of gas at STP is 0.5 mol.

Answer:

110

Explanation:

Answer:

92.41 g

Explanation:

Answer: He should order 92.41g of the limiting reactant.

Answer:

protons

Explanation:

Protons is the answer, because they are what determines the identity of an element. Hydrogen always has one proton. No more, no less.

You can remove electrons from an element and it is still the same element. We call it an ion when this happens: think of something like Na+ or Cl-. An electron has been taken or added to those elements, but they're still the same element!

You can remove neutrons from an element and it is still the same element. We call it an isotope when this happens: maybe you've heard of carbon-14, which has two extra neutrons. We use that in carbon-dating. It's still carbon, though!

Those other options, A B and D, are made up of quarks. This isn't the right answer, because you can have two elements with different amount of quarks because quarks make up neutrons and other subatomic particles.

Final answer:

Atoms of an element have the same number of protons, and those with different numbers of neutrons are called isotopes. The mass number (A) is the sum of protons and neutrons in the nucleus. (Option A)

Explanation:

Atoms of an element always have the same number of protons, which is characteristic of that particular element and is known as the atomic number (Z). Atoms that vary in the number of neutrons found within their nuclei are called isotopes. The overall charge of an atom is neutral because it has an equal number of protons and electrons.

Furthermore, the sum of the numbers of protons and neutrons is the mass number, notated as (A). For instance, the carbon atom, which has 6 protons and can have varying numbers of neutrons, is recognized in its standard form as having 6 neutrons, making its mass number (A = 12).

Answer:

about 19 or 20 g

Explanation:

To do this, is neccesary to watch a solubility curve of this compound. This is the only way that you can know how many grams are neccesary to dissolve this compound in 50 mL of water to a given temperature.

Now, if you watched the attached graph, you can see the solubility curve of many compounds in 100 g of water (or 100 mL of water). So, to know how many do you need in 50 mL, it's just the half.

So watching the curve, you can see that at 20 °C, we simply need between 35 g and 40 g. Let's just say we need 38 grams of NH4Cl to be dissolved in 100 mL of water.

So, in 50 mL, it's just the half. So, we only need 19 g or 20 g of NH4Cl at 20 °C, to dissolve this compound in water.

Answer:

Simply put, your balloon will pop before it can get to that point due to pressure.

Answer:

it would pop as soon as it was exposed to the vacuum of space. The pieces would then burn or freeze depending on how far you are from the nearest star

Answer:

The mass of water vapor is 44.46 grams

The volume of water is 30.37 L

Explanation:

Step 1: Data given

Mass of CH3OH =42.5 grams

Molar mass CH3OH = 32.04 g/mol

Volume of O2 = 22.8 L

Pressure = 2.00 atm

Step 2: The balanced equation

2CH3OH + 3O2 → 2CO2 + 4H2O

Step 3: Calculate moles CH3OH

Moles CH3OH = mass CH3OH / molar mass CH3OH

Moles CH3OH = 42.5 grams / 32.04 g/mol

Moles CH3OH = 1.326 moles

Step 4: Calculate moles O2

p*V = n*R*T

⇒with p = the pressure = 2.00 atm

⇒with V = the volume of O2 = 22.8 L

⇒with n = the moles of O2  = TO BE DETERMINED

⇒with R = the gas constant = 0.08206 L*Atm/mol*K

⇒with T = the temperature = 27 °C = 300 K

n = (p*V) / (R*T)

n = (2.00 * 22.8) / (0.08206*300)

n = 1.85 moles

Step 5: Calculate the limiting reactant

For 2 moles CH3OH we need 3 moles O2 to produce 2 moles CO2  and 4 H2O

O2 is the limiting reactant. It will completely be consumed ( 1.85 moles). CH3OH is in excess. There will react 2/3*1.85 = 1.233 moles. There will remain  1.326 - 1.233 = 0.093 moles

Step 6: Calculate moles products

For 2 moles CH3OH we need 3 moles O2 to produce 2 moles CO2  and 4 H2O

For 1.85 moles O2 we'll have 1.233 moles CO2 and 2.467 moles H2O

Step 7: Calculate mass H2O

Mass H2O = moles H2O * molar mass H2O

Mass H2O = 2.467 moles * 18.02 g/mol

Mass H2O = 44.46 grams

Step 8: Calculate volume H2O

p*V = n*R*T

⇒with p = the pressure = 2.00 atm

⇒with V = the volume of H2O = TO BE DETERMINED

⇒with n = the moles of H2O  = 2.467 moles

⇒with R = the gas constant = 0.08206 L*Atm/mol*K

⇒with T = the temperature = 27 °C = 300 K

V = (n*R*T)/p

V = (2.467 * 0.08206 * 300) / 2.00

V = 30.37 L

The mass of water vapor is 44.46 grams

The volume of water is 30.37 L

Answer:

THE MOLARITY OF SODIUM CHLORIDE IN THE CONTAINER IS 0.3846 M.

Explanation:

Molarity of a solution is the number of moles of solute per dm3  of solution.

Mass concentration = Molar concentration * Molar mass

1. calculate the mass concentration;

Mass conc. = 45 g in 2 L

= 45 g in 2 dm3

In 1 dm3, the mass will be 45 / 2

= 22.5 g/dm3 of NaCl.

2. Calculate the molar mass;

(Na = 23, Cl = 35.5)

Molar mass = ( 23 + 35.5 ) g/mol

Molar mass = 58.5 g/mol

3. calculate the molarity

Molarity = mss concentration / molar mass

Molarity = 22.5 g/dm3 / 58.5 g/mol

Molarity = 0.3846 mol/dm3 of NaCl.

The molarity of sodium chloride in the container is 0.3846 mol/dm3

Answer:

2.44 K IS THE TEMPERATURE OF THE GAS

Explanation:

PV = nRT

P = 0.5 atm

V = 2 L

n = 5 moles

R = 0.082 L atm mol^-1 K^-1

T = ?

Substituting for T in the equation, we obtain:

T = P V / nR

T = 0.5 * 2 / 5 * 0.082

T = 1 / 0.41

T = 2.44 K

The temperature of the gas is 2.44 K

Deforestation leads to increased carbon dioxide levels in the atmosphere by preventing trees from absorbing it and releasing stored carbon dioxide back into the air.

Deforestation significantly impacts carbon dioxide levels in the atmosphere. When trees are cut down, they can no longer remove carbon dioxide from the atmosphere, leading to an increase in carbon dioxide levels. Additionally, burning trees releases stored carbon dioxide back into the atmosphere, further contributing to the greenhouse effect and climate change.

Answer:

Earth's Core!

The speed of the plane in cloudy skies is calculated by subtracting the lesser distance it covers in such conditions from its usual distance (3952km - 184km = 3768), and then dividing by the given time which is 3 hours. The speed is thus 1256 km/h.

To calculate the speed of the plane flying in cloudy skies, we first need to establish the number of kilometers the plane usually flies which is 3952 km. In cloudy conditions, it covers 184 km less, so we subtract that from the usual distance (3952 - 184 = 3768 km). The time is still 3 hours. Speed is calculated by dividing the distance by the time. That gives us 3768 km / 3 hours = 1256 km/h.

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Option A. Oxygen is the vital element that participates in the carbon, nitrogen, and phosphorus cycles.

The vital element for life that participates in the carbon, nitrogen, and phosphorus cycles is oxygen. Oxygen is necessary for the breakdown of organic matter and the release of carbon, nitrogen, and phosphorus compounds back into the environment. In the carbon cycle, oxygen is involved in the process of cellular respiration and photosynthesis. In the nitrogen cycle, oxygen is necessary for the conversion of nitrogen gas into usable forms by bacteria. In the phosphorus cycle, oxygen is involved in the weathering of rocks and the release of phosphates.

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