If a crate contains 25,500 ounces (oz) of rice, about how many kilograms (kg) does it contain?

Answer: 25%

Explanation:  

1. Transmittance, T= P/P0  

Where P = light exiting the cell

           P0 = light entering the cell

Therefore %T =  P/P0 ×100

           = 50/200×100

=25%

2. Absorbance, A= -log(T)

But T= 0.25

Therefore A= -log(0.25)

                  = 0.6020

Answer:

1.674 x 10^-23 grams

Explanation:

Hydrogen-1 is called Protium

wikipedia

atomic mass of Protium is 1.00794 amu

sciencedirectcom

atomic mass of 10 Protiums is 10.0794 amu

10.0794 amu in grams is

1.6737236x10^-23 grams

Answer:

To resolve this, we need to place the coefficient “2” in front of the sodium in the reactant, to give the equation shown below. 2 Na (s) + Cl 2 (g) → 2 NaCl (s) In this equation, there are two sodiums in the reactants, two sodiums in the products, two chlorines in the reactants and two chlorines in the products; the equation is now balanced.

Explanation:

Answer:

5.74M or 5.74 mol/L (to 3 sign. fig.)

Explanation:

The molar mass of NaNO3 is 85g/mol, which means that:

1 mole of NaNO3 - 85g

? moles - 122.0g

= 122/85 = 1.44 moles

Concentration in mol/L = no. of moles (moles) ÷ volume (L)

\(\frac{1.44}{0.250}\) = 5.74M or 5.74 mol/L (to 3 sign. fig.)

I hope the steps are clear and easy to follow.

pH determines the acidic or alkaline a solution is using the pH scale, which has a range of 0 to 14. An alkaline pH is greater than 7, while an acidic pH is less than 7.

Thus, The pH of a solution is defined mathematically as the negative logarithm of the molar concentration of hydrogen ions therein.

NaOH is a strong alkaline, as indicated by a pH testing strip, but in order to determine its exact pH, you must first determine its molarity.

A scale known as pH is used to describe how basic or acidic a water-based solution is. Basic solutions have a higher pH than acidic solutions, which have a lower pH.

Thus, pH determines the acidic or alkaline a solution is using the pH scale, which has a range of 0 to 14. An alkaline pH is greater than 7, while an acidic pH is less than 7.

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The pH of HNO₂ is 2.15, pH of NH₄OH is 10.98 and pH of H₂S is 3.76.

pH is defined as the negative logarithm of H⁺ ion concentration.

pH is a measure of how acidic or basic a substance is. In our everyday routine, we encounter and drink many liquids with different pH. Water is a neutral substance. Soda and coffee are often acidic.

The pH is an important property, since it affects how substances interact with one another and with our bodies. In our lakes and oceans, pH determines what creatures are able to survive in the water.

Given,

1. Concentration = 0.1

Ka = 4.5 × 10⁻⁴

\(pH = \frac{1}{2} (pka - log c)\)

pH = 0.5 × ( 3.3 + 1)

= 2.15

2.  Concentration = 0.05

Ka = 1.8 × 10⁻⁵

\(pOH = \frac{1}{2} (pkb - log c)\)

pOH = 0.5 × ( 4.74 + 1.3)

= 3.02

pH = 14 - pOH

= 14 - 3.02

= 10.98

3. Concentration = 0.3

Ka = 1 × 10⁻⁷

\(pH = \frac{1}{2} (pka - log c)\)

pH =  0.5 × ( 7 + 0.52)

= 3.76

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The characteristics of a good recrystallization solvent are;

We know that recrystallization is the process by which we can be able to remove impurities from a solute. We can obtain the solute as the product of a given reaction.

We know that there are certain properties of the solvent that would make the solvent to be sufficient as a tool for the process of recrystallization to obtain the desired results.

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Answer:

When a copper is drawn into wire the only change that occurs is change in its shape and size no change will take place into its composition that is the wires are still possessing the properties of copper metal. Thus, a physical change takes place when copper is drawn into wire.

Answer: The balanced chemical equation for the reaction between potassium iodide (KI) and calcium chloride (CaCl₂) in aqueous solution can be written as:

2KI(aq) + CaCl₂(aq) → CaI₂(aq) + 2KCl(aq)

In this reaction, two molecules of potassium iodide react with one molecule of calcium chloride to produce one molecule of calcium iodide and two molecules of potassium chloride. The equation is balanced because the number of atoms of each element is equal on both sides of the equation.

Explanation: Please mark as brainliest for me love! <3

Answer:

A because it's uniform

Answer:

a

Explanation:

Answer: D

Because when you balance the combustion equation

C4H8O2 + 5O2--> 4CO2 + 4H2O

this is now obeying the law of combustion meaning

both sides have 4 carbons

8 hydrogens

12 oxygens

Explanation:

Answer:

True

Explanation:

A hypothesis can be proven true through experimentation. For example, if you hypothesize that a balloon with helium will float in the air, and then you test this and the balloon floats, you have just proven that your original hypothesis is true.

Answer:

Choice A.

A low birth to death ratio

Explanation:

A low birth to death ratio means that people are dying faster than they are being born. This leads to a decreasing population size.

Answer:

It's A

Explanation:

ΔLatticeU = ΔLatticeH – pΔVm is the lattice energy of wurtzite.  Ionic compounds often have flat surfaces that meet at distinctive angles and are stiff, brittle, crystalline materials.

Remember that when a metal reacts with a nonmetal, often an ionic compound results from the transfer of electrons form the metal (the reductant) towards the nonmetal (the oxidant). Ionic compounds often have flat surfaces that meet at distinctive angles and are stiff, brittle, crystalline materials. They melt at rather high temperatures and are not easily distorted.   ΔLatticeU = ΔLatticeH – pΔVm is the lattice energy of wurtzite.

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Theoretically, if 20 grams of hydrogen reacts then 112.5 grams of ammonia is produced.

The balanced chemical equation can be given as:

N₂+3H₂→ 2NH₃

From stoichiometry, 2 mol of NH₃is produced from 3 mol of H₂

5 mol of NH₃ will be produced from = 3/2×5 = 7.5 mol of H₂

∴mass of H₂=7.5×2= 15gm of H₂.

Excess reagents are those reactants in a chemical reaction that are not exhausted at the end of the reaction. A completely exhausted or reacted reagent is called a limiting reagent because its amount limits the number of products formed. In this reaction, the excess reagent is Nitrogen as 35 grams of nitrogen and 15 grams of hydrogen react to produce 34 grams of ammonia.

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Changes or mutations in genes can lead to changes in proteins through their impact on the genetic code and subsequent protein synthesis.

Genes carry the instructions necessary for the production of proteins, which are essential for various cellular functions. Mutations can occur spontaneously or due to factors such as environmental exposures, errors during DNA replication, or genetic predispositions.

Mutations can take various forms. Substitution mutations involve the replacement of a single nucleotide base with another, potentially altering the codon sequence in the gene. This change can result in the incorporation of a different amino acid during translation, leading to an altered protein structure and function.

Insertion or deletion mutations involve the addition or removal of nucleotides in the gene sequence. These mutations can disrupt the reading frame, causing a shift in the codon sequence downstream. As a consequence, the resulting protein can have an entirely different amino acid sequence, often resulting in a non-functional or severely impaired protein.

Mutations in regulatory regions of genes can also impact protein production. These regions control gene expression by influencing the binding of transcription factors. Alterations in these regulatory elements can lead to changes in the amount of protein produced, affecting cellular processes.

Overall, mutations in genes can result in changes to proteins by modifying the genetic code. These changes can affect protein structure, function, stability, and interaction with other molecules, ultimately impacting cellular processes, development, and disease susceptibility.

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Explanation:

The theoretical volume of ammonia that should be produced in the Haber process if we start with 5.0 L of nitrogen (N2) at standard temperature and pressure (STP) can be calculated as follows:

1 mole of N2 reacts with 3 moles of H2 to form 2 moles of NH3

Thus, the number of moles of N2 present can be calculated using the Ideal Gas Law:

PV = nRT

Where n is the number of moles of gas, R is the gas constant, T is the temperature in Kelvin, P is the pressure in atmospheres, and V is the volume in liters.

At STP (0°C and 1 atm), the volume of one mole of gas is 24.45 L.

Given 5.0 L of N2 at STP, the number of moles of N2 can be calculated as:

n = (PV)/RT = (1 atm)(5.0 L)/(0.0821 atmL/molK)(273 K) = 1.96 moles

The number of moles of NH3 produced can then be calculated as:

n = (2 moles of NH3)/(1 mole of N2) = 2 moles/1 mole = 2 moles

The volume of NH3 can be calculated as:

V = nRT/P = (2 moles)(0.0821 atmL/molK)(273 K)/(1 atm) = 44.8 L

So, the theoretical volume of ammonia (NH3) that should be produced if we start with 5.0 L of N2 at STP is 44.8 L.

1) Exact numbers are the result of a count. In contrast, measured numbers have a finite number of significant figures.

The volume of a piece of aluminum. This comes from a measure.

The number of centimeters in an inch. This is a defined number. It is exact.

Today's temperature. This comes from a measure.

The number of second in a year. This is a defined number.

Answer:

In an acid-base reaction, the base always receives the H+.

Explanation:

Answer:Since dinosaurs are thought to be over 65 million years old, the news is stunning - and more than some could tolerate.  After the AOGS-AGU conference in Singapore, the abstract was removed from the conference website by two chairmen because they could not accept the findings.  Unwilling to challenge the data openly, they erased the report from public view without a word to the authors.  When the authors inquired, they received this letter:

Explanation:

i do not own my copyrights

The total kilojoules in two tablespoons is  836.8 kJ.

To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.

The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.

For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:

100 kcal * 4.184 kJ/kcal = 418.4 kJ

So, if we have two tablespoons of this substance, the total energy would be:

418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ

It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.

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For the first ionization energy of mercury is 1006 kJ/mol. The energy change for the reaction  is mathematically given as

dH = 1006KJ/mol

The amount of energy required to remove an electron from a neutral atom is called ionization energy. from the question, the electron is removed from the neutral atom Hg to give the first ionization energy

Hg→Hg +e

therefore the energy change for the reaction is

dH = 1006KJ/mol

In conclusion, the energy change for the reaction is

dH = 1006KJ/mol

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Answer:

Explanation:

Assumptions

Note

The concentrations would merely add. All things change if the assumptions I've made are not true.

The amount of heat transferred to the sample of sodium is 332,699.149.

The amount of heat absorbed or released by a substance can be calculated using the following formula;

Q = mc∆T

Where;

According to this question, 898.3g sample of sodium experiences a temperature change of +301.11 K. The specific heat capacity of sodium is 1.23 J/(g-K).

Q = 898.3 × 1.23 × 301.11

Q = 332,699.149 J

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You start with 285mL of 0.35M solution of NaCl. Sufficient amount of water is added so that the volume increases to 550mL. What will be concentration of the new solution.

Initial volume = V₁ = 285 mL

Initial concentration = M₁ = 0.35 M

Final volume = V₂ = 550 mL

Final concentation = M₂ = ?

We are only adding water to our solution, so we are diluting the solution. The number of moles of NaCl will remain constant. Since the amount of the solute is constant, in dilution exercises we can use this formula:

V₁ * M₁ = V₂ * M₂

If we solve it for the final concentration we get:

M₂ = V₁ * M₁ / V₂

If we replace by the given values we obtain:

M₂ = 285 mL * 0.35 M / 550 mL

M₂= 0.18 M

Answer:

a Binomial Naming System

Explanation:

1. 5 moles

2. 75.6 grams

3. 2 moles

4.  1.806 x 10²⁴ particles

Given

mass and moles of compound

Required

mass, moles and number of particles

Solution

1. 530 g Na2CO3

mol = 530 g : 106 g/mol

mol = 5

2. 4.2 moles H2O

mass = 4.2 moles x 18 g/mol

mass = 75.6 grams

3. 12.04 x 10²³ O2

mol =   12.04 x 10²³ : 6.02  x 10²³

mol = 2

4. 3 moles of Mg

particles = 3 x 6.02  x 10²³

particles = 1.806 x 10²⁴

To solve this problem, we can use the formula:

q = m × c × ΔT

where q is the heat absorbed or released, m is the mass of the substance, c is its specific heat, and ΔT is the change in temperature.

First, let's calculate the mass of water:

m = 225.0 g

Next, let's calculate the heat absorbed by the water:

q_water = m × c × ΔT

q_water = 225.0 g × 4.184 J/(g·°C) × (24.60°C - 20.53°C)

q_water = 3749.8 J

Since the metal released 4274 J of heat, the heat absorbed by the calorimeter can be calculated by subtracting the heat absorbed by the water from the total heat released by the metal:

q_calorimeter = - (q_water + q_metal)

q_calorimeter = - (3749.8 J + 4274 J)

q_calorimeter = - 8023.8 J

Therefore, the heat absorbed by the calorimeter is -8023.8 J, which is approximately equal to -8000 J or -8.0 kJ. The answer is (c) -339 J, since it is the closest to the calculated value when rounded to the nearest integer. Note that the negative sign indicates that the calorimeter absorbed the heat, which is expected since the reaction involved a release of heat.