A sample of iron absorbs 67.5 J of heat, upon which the temperature of the sample
increases from 21.5 °C to 28.5 °C. If the specific heat of iron is 0.450 J/g OC, what is
the mass (in grams) of the sample?

Hi! Science stands for “Systematic Comprehensive Investigation and Exploration of Nature Causes and Effects”.

What is science?

Science is the systematic study of the structure and behavior of the physical natural world. It is also use for experience or can say it is an experience. Scientists are people who test science/experiments for the worlds. Science really is just the study of the nature. Science use math em empathic and logic, which are sometimes called “formal science”.

Answer:

As scientist discovered that Science is the method of learning everything about the natural world.

The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)

In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.

The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.

The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.

In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.

It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.

Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.

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They can harvest electrons from their food sources, such as organic materials, and feed them into devices known as microbial fuel cells (MFC) in order to generate power. They can even create energy from ordinary soil in this way!

Bacteria act as biocatalysts in microbial fuel cells (MFCs), which use organic materials as substrate (or food for the microorganisms) and microorganisms as biocatalysts.

Therefore, Chemical energy in the substrate is transformed into usable electrical energy as the active bacteria break it down.

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Answer:

380g

Explanation:

Given parameters:

Number of moles of Fluorine  = 20moles

Unknown:

Mass of Fluorine  = ?

Solution:

The number of moles is the unit of quantifying the amount of particles in a substance.

 So;

      Mass of a substance  = number of moles  x molar mass

Molar mass of F = 19g/mol

 Now;

     Mass of F = 20 x 19 = 380g

1) The pH is 2.5

2) The pH is 11.5

3) The initial concentration is\(2.1 * 10^-14\)M

pH is a measure of the acidity or basicity of a solution. It is defined as the negative logarithm of the concentration of hydrogen ions in the solution.

1) The pH of the solution can be gotten from;

K = \(x^2\)/0.65 - x

\(1.754 * 10^-5\)(0.65 - x) =  \(x^2\)

\(1.14 * 10^-5 - 1.754 * 10^-5x = x^2\\x^2 + 1.754 * 10^-5x - 1.14 * 10^-5 = 0\)

x = 0.003 M

pH = -log(0.003)

= 2.5

2) Kb = \(x^2\)/0.35 - x

\(1.8 * 10^-5 (0.35 - x) = x^2\\6.3 * 10^-6 - 1.8 * 10^-5x = x^2\\x^2 + 1.8 * 10^-5x - 6.3 * 10^-6 = 0\)

x = 0.003 M

pOH = -log (0.003)

= 2.5

pH = 14 - 2.5 = 11.5

3) Hydrogen ion concentration = Antilog (-11.5)

= 3.2 * 10^-12 M

\(4.9 * 10^-10 = ( 3.2 * 10^-12)^2/x \\4.9 * 10^-10x = ( 3.2 * 10^-12)^2\\x = ( 3.2 * 10^-12)^2/4.9 * 10^-10\\x = 2.1 * 10^-14 M\)

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Answer:

3352.487 liters FeO. I'm not sure if this is the correct answer though.

8+(-6)8+(-6)8+(-6)8+(-6)8+(-6)8+(-6)8+(-6)8+(-6)

The differences in the distribution of solar energy on Earth's surface is due to Earth’s curved shape and tilt on its axis do not allow the sun’s rays to fall evenly on its surface.

The correct option is D.

Solar energy refers to the energy produced by the Sun.

Solar energy is in the form of heat energy, light energy, and ultraviolet radiation.

The shape of the affects the amount of solar energy that reaches any region of the earth. The earth is spherical in shape. Hence, there is an uneven distribution of solar energy from the sun o the Earth. also, the tilt of the earth affects the amount of solar energy that reaches any region of the earth.

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Answer:true

Explanation:

Because yea

The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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What happens to an organism if an organ or organ system does not function properly?

All of the organ systems of the body work together to maintain homeostasis of the organism. If homeostasis fails, death or disease may result.

Why do organisms forget some things and remember others?

The main reason is that in order for us to store information and remember it, our senses have to capture them perfectly.

How are some organisms able to survive as single cells while other types of organisms have multiple body systems each made of many cells?

The one cell can do it all.

Why do some animals have a heightened sense such as sight or smell?

All aspects of an animal's senses, from the structure of its sensory organs to the numbers of receptor cells and the behaviour of its brain, are ultimately derived from its genes. It's the genes that decide how well an animal can smell, see, hear or taste.

Do organisms instinctively know how to respond to the environment, or do they have to learn how to respond?

All animals, including humans, have instinctual behavior, but animals can't survive on their instincts alone. Animals need to be able to respond to their environment to survive. ... This process of modifying behavior based on experience is called learning.

hopefully this helped! :)

The rate constant for the reaction is either 7.14×10−3 s−1 or 2.50×10−3 s−1, depending on which rate was used to calculate it.

The rate of the reaction is given by the equation:

Rate = -k[A]

where k is the rate constant and [A] is the concentration of the reactant.

Rate at t=140 s:

Rate = (8.00×10−2 M - 0 M) / (140 s - 0 s)

= 5.71×10−4 M/s

Rate at t=400 s:

Rate = (4.00×10−2 M - 0 M) / (400 s - 0 s)

= 1.00×10−4 M/s

Since this is a zero-order reaction, the rate of the reaction is constant, and we can use either rate to calculate the rate constant:

k = Rate / [A]

Using the rate at t=140 s:

k = 5.71×10−4 M/s / 8.00×10−2 M = 7.14×10−3 s−1

Using the rate at t=400 s:

k = 1.00×10−4 M/s / 4.00×10−2 M

= 2.50×10−3 s−1

The rate constant for the reaction is either 7.14×10−3 s−1 or 2.50×10−3 s−1.

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Answer:

hi

Explanation:

Answer:When viruses infect you, they attach to your cells, get inside them, and make copies of their RNA, which helps them spread. If there’s a copying mistake, the RNA gets changed. Scientists call those changes mutations.

Explanation:

i hope this answer your Question

The different ways that atoms combine with each other help us identify different types of Compound

Answer:

She turned back at the point at which she forgot she left her briefcase. If this isn't the correct answer, please be more specific in the question.

Explanation:

NaOH has ais a liter value for titration molarity of 1 mole.

Molarity-

The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another term for molarity.

If you know how many grams of NaOH is dissolved in a known amount of solvent, you can use the formula below to calculate its molarity.

The molarity of NaOH is determined, for instance, when 10 gm of NaOH is dissolved in 250 ml of water.

Molarity is calculated as (Weight of NaOH taken*1000)/(250*NaOH's molecular weight).

Molarity equals (10*1000)/(250*40).

NaOH has a molarity of 1 mole.

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The full question-

How do you calculate the molarity of NaOH?

Answer:

1or 3

Explanation:

The volume of 0.889 M NaOH needed to neutralize 48.7 mL of 0.967 M HCl in a titration is  43.22 mL of 0.889 M NaOH, as this is a stoichiometry problem that involves a titration between an acid (HCl) and a base (NaOH).

NaOH + HCl → NaCl + H2O

From this equation, one can see that 1 mole of NaOH reacts with 1 mole of HCl.

So, the equation is :

Moles of NaOH = Moles of HCl

To calculate the volume of NaOH needed to neutralize the given amount of HCl, the following formula is used,

Volume of NaOH (in mL) = (Moles of HCl) x (Molarity of NaOH) / (Molarity of HCl)

The moles of HCl is calculated,

Moles of HCl = (0.967 mol/L) x (48.7 mL / 1000 mL) = 0.04703 mol

The volume of NaOH,

Volume of NaOH = (0.04703 mol) x (0.889 mol/L) / (0.967 mol/L) = 0.04322 L = 43.22 mL

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Answer:

By visiting other households with cats.

Explanation:

This will give Brian a variety of other houses and determine if it is truly cats or just alleries from other items. This is the most direct way to get Brian the answer he is looking for.

Answer:

c

Explanation:

i just did it

The answer is C.less -- freeze -- less​

The balanced chemical reaction for the synthesis of carbon with hydrogen is CH₄ = C + 2H₂

Balance chemical equation refers to chemical reactions in which the moles and atoms on both the reactant side and product side are the same.

It is a way of balancing chemical equation in which the atoms of each chemicals on the product and reactant are the same.

The balanced chemical reaction for the synthesis of carbon with hydrogen is CH₄ = C + 2H₂

In this reaction,  one molecule of methane is formed by combining one atom of carbon with two molecules of hydrogen gas.

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Answer:

What is ionizing radiation? Ionizing radiation is radiation with enough energy that to remove tightly bound electrons from the orbit of an atom, causing that atom to become charged or ionized.

Q = Ksp = 1 × 10^(-12).

Substituting the values into the Nernst equation, we have:

0.799 V = E° - (RT/2F) * ln(1 × 10^(-12))

Now, solving for E°:

E° = 0.799 V + (RT/2F) * ln(1 × 10^(-12))

The value of R is the ideal gas constant, T is the temperature in Kelvin, and F is the Faraday constant.

To find the standard reduction potential at 25°C for the half-reaction Ag2CrO4(s) + 2e¯ → 2Ag(s) + CrO4²-(aq), we can use the Nernst equation, which relates the standard reduction potential (E°) to the equilibrium constant (K) and the reaction quotient (Q).

The Nernst equation is given as follows:

E = E° - (RT/nF) * ln(Q)

Given information:

Ksp = 1 × 10^(-12)

E = +0.799 V (standard reduction potential of Ag+ to Ag)

Since the reaction involves the dissolution of Ag2CrO4(s), the reaction quotient Q can be expressed as [Ag+]²/[CrO4²-].

Since the stoichiometry of the reaction is 2:1 for Ag2CrO4 to Ag+, we can say that [Ag+]² = Ksp.

Therefore, Q = Ksp = 1 × 10^(-12).

Substituting the values into the Nernst equation, we have:

0.799 V = E° - (RT/2F) * ln(1 × 10^(-12))

Now, solving for E°:

E° = 0.799 V + (RT/2F) * ln(1 × 10^(-12))

The value of R is the ideal gas constant, T is the temperature in Kelvin, and F is the Faraday constant.

Please note that without specific values for temperature (T) and the ideal gas constant (R), the exact standard reduction potential at 25°C cannot be determined.

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Step 1 - Converting mass, moles and number of molecules

a) Converting mass to moles

To convert between these two unities we'll be using the molar mass of the substance. The molar mass can be found at the periodic table and gives the mass of one mole of that susbtance.

Let's say we want to calculate the molar mass of water, H2O. Looking at a periodic table, we find that the molar masses of H and O are, respectively, 1 g/mol and 16 g/mol.

The molar mass of water would be thus:

The total number of moles of electrons lost by Mg(s) when 2.0 moles of electrons are gained by Ni2+(ag) is also 2.0 moles of electrons.

This is because in a chemical equation, the number of moles of electrons gained by the reducing agent (in this case Ni2+) is equal to the number of moles of electrons lost by the oxidizing agent (in this case Mg(s)).

In this redox reaction, Mg is being oxidized because it loses electrons and Ni is being reduced because it gains electrons. The oxidation and reduction process are occurring simultaneously, so the number of electrons lost by Mg(s) is equal to the number of electrons gained by Ni2+(ag).

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The electrons that are gained by the \(Ni^{2+}\) ion is 2.0 moles of electrons.

We know that when there is a redox reaction, there would be the loss or gain of electrons in the process. The process is a simultaneous one so the electrons that are lost by one specie must as a matter of necessity be gained by another specie.

In this case, as we look at the reaction equation we can see that there are two electrons that have been lost by the magnesium atom and these two electrons would be gained by the Nickel II ion.

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The energy traveled from you to your friend through the medium of the air. When you moved your arm, the energy created a vibration in the air which then propagated in all directions. As the wave traveled, it passed through the air and eventually reached your friend, carrying energy with it.

Energy is the ability to do work or cause change. It is the capacity to cause motion, to create heat, to transform matter, or to generate electricity. It can come from a variety of sources, such as the sun, wind, water, fossil fuels, nuclear energy, and other renewable sources. Energy can also be stored in batteries or fuel cells. It is a fundamental component of the universe and is essential for life. All life forms require energy to survive and grow, and energy is also necessary for the development of technology. Without energy, the world would not function as it does today.

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