What is the percent yield if the actual yield is 1.5g and the theoretical yield is 4.5g?

When working with a new chemical in the lab, there are several important steps you should always take prior to starting your experiment to ensure safety. Here are the steps you should follow:

1. Read the Safety Data Sheet (SDS): The SDS provides detailed information about the chemical, including its properties, hazards, handling precautions, and emergency procedures. It is crucial to review the SDS to understand the potential risks associated with the chemical.

2. Conduct a Risk Assessment: Evaluate the potential risks and hazards associated with the chemical. Consider factors such as toxicity, flammability, reactivity, and the possibility of exposure. Identify any necessary safety precautions and procedures.

3. Plan and Prepare: Based on the risk assessment, plan and prepare the necessary safety measures and equipment. This may include wearing appropriate personal protective equipment (PPE) such as gloves, goggles, lab coats, or respirators. Ensure that safety equipment, such as eyewash stations and fire extinguishers, are easily accessible.

4. Communicate and Consult: Inform your lab supervisor or colleagues about the chemical you will be working with. Share the necessary information and precautions to ensure everyone is aware of the potential risks and can take appropriate safety measures.

5. Familiarize Yourself: Take the time to become familiar with the chemical's properties, handling procedures, and emergency response protocols. Understand how to safely handle, store, and dispose of the chemical.

By following these steps, you can help minimize the potential risks and ensure a safe working environment when handling new chemicals in the lab. Remember, always prioritize safety and seek guidance from experienced professionals when necessary.

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Answer:

making drinks, purifying water

Explanation:

The final temperature of the mixed water is 44.66 ⁰C.

The given parameters;

mass of the cold water, m = 100 g

initial temperature of the water, t₁ = 24.9 ⁰C

initial  temperature of the hot water, t₂ = 71.0⁰ C

mass of the hot water = 75 g

specific heat capacity of water is 4.184 J/g⁰C

The final temperature of the mixture is calculated as follows;

Based on the principle of conservation of energy;

Heat lost by hot water = heat gained by the cold water

mcΔθ₂ = mcΔθ₁

75 x 4.184 x (71.0 - T) = 100 x 4.184 x (T - 24.9)

75 x (71.0 - T) = 100 x (T - 24.9)

(71.0 - T) = 1.333(T - 24.9)

71.0 - T = 1.333T - 33.1917

71.0 + 33.1917 = 1.333T + T

104.1917 = 2.333T

Thus, the final temperature of the mixed water is 44.66 ⁰C.

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The compound that would form a precipitate in water is  BaSO4.

option d.

BaSO4 (barium sulfate) would form a precipitate in water because it is classified as an insoluble compound according to most solubility charts. When a compound is considered insoluble, it means that it has a very low solubility in water, resulting in the formation of solid particles or precipitate when dissolved in water.

In the case of BaSO4, it does not readily dissociate into ions in water and remains as solid particles, causing it to precipitate.

On the other hand, a. KCI (potassium chloride), b. NaOH (sodium hydroxide), and c. (NH4)2S (ammonium sulfide) are soluble compounds in water. They dissociate into ions and form homogenous solutions when dissolved in water, without forming a precipitate.

It's worth noting that solubility can vary depending on factors such as temperature and concentration, so it's always important to consult a solubility chart or reference for accurate and up-to-date information on specific compounds.option d.

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Answer:

thermal energy is used to heat water, which is pumped through a system of pipes and radiators. a warm-air heating system burns fuel in a furnace to produce thermal energy.

Answer:

"500 Joule/sec" is the right answer.

Explanation:

The given values are:

Force,

F = 1000 N

Velocity,

s = 10 m

Time,

t = 20 s

Now,

The power will be:

=  \(\frac{Force\times Velocity}{Time}\)

On putting the values, we get

=  \(\frac{1000\times 10}{20}\)

=  \(\frac{10000}{20}\)

=  \(500 \ Joule/sec\)

Answer:

5.0 x 10^-7

Explanation:

[H+]=10^-6.3

Ferrihydrite in forest soil at pH=5 is more likely to sorb benzene than 2,4-D. At pH=4, the sorption potential of 2,4-D to ferrihydrite may be enhanced due to increased positive charge on the surface of the hydroxide.

Ferrihydrite, a type of iron oxide, has the ability to sorb organic compounds through various mechanisms such as surface complexation, hydrogen bonding, and hydrophobic interactions. Benzene, being a non-polar compound, is more likely to sorb to ferrihydrite due to hydrophobic interactions and weak van der Waals forces. On the other hand, 2,4-D, being a polar compound, may have limited sorption to ferrihydrite at pH=5 due to the dominance of repulsive interactions between the negatively charged surface of ferrihydrite and the negatively charged 2,4-D molecule.

At pH=4, the increased positive charge on the surface of ferrihydrite enhances the sorption potential of 2,4-D. The positive charge can attract and bind with the negatively charged 2,4-D molecule through electrostatic interactions. This can result in increased sorption of 2,4-D to ferrihydrite in tropical soils like Qxisol.

Conversely, at pH=9, the increased pH results in a decrease in the positive charge on the surface of ferrihydrite. This reduction in positive charge limits the sorption potential of 2,4-D as the electrostatic attraction between the hydroxide and the 2,4-D molecule decreases. This suggests that in arid soils like Aridisol, characterized by higher pH levels, the sorption potential of 2,4-D to ferrihydrite may be lower compared to humid climates.

The sorption potential of 2,4-D as a function of soil type in humid vs. arid climates can be predicted by considering the pH of the soil. Higher pH in arid soils can lead to reduced sorption of 2,4-D to hydroxides like ferrihydrite or goethite, while lower pH in humid soils can enhance the sorption potential due to increased positive charge on the hydroxide surface.

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The least uncertainty in any simultaneous measurement of the momentum component px of this electron is 5.92 × 10⁻²⁸ kg m/s. Planck's constant, h = 6.626 x 10^-34 J s.

To determine the least uncertainty in any simultaneous measurement of the momentum component px of this electron. The Uncertainty Principle is a fundamental principle in quantum mechanics, also known as the Heisenberg Uncertainty Principle. The principle stipulates that it is impossible to know the exact position and momentum of a subatomic particle simultaneously with absolute precision.

The Heisenberg Uncertainty Principle mathematically expresses the relationship between position and momentum of a particle given by the following equation:Δx Δp ≥ h/4πwhere Δx is the uncertainty in position, Δp is the uncertainty in momentum, h is Planck's constant, and π is a mathematical constant that approximates to 3.1416.

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Answer:

1.) Answer: of atoms (molecules)÷ avogadro no. Since one mole is defined as 6.022 x 10^23, and there are two hydrogen per molecule, that would mean that there are exactly 12.044 x 10^23 molecules of hydrogen in one mole of water.

2.)How many moles are in 8.30 X 1023 molecules of H2O? 1.38 moles H2O

3.)1 mol of water contains 6.022 × 1023 H2O molecules Therefore 0.500 mol contains 0.500 × (6.022 × 1023) = 3.01 × 1023 H2O molecules.

4.)6.02x1023 atoms

5.) 9.03x1023 atoms Hg 9.03x1024 atoms Hg 903 atoms of Hg

6.)6.022×1023

7.)1.51x1023 atoms Rb

8.)0.048 moles

9.)2.04

10.)How many moles are in 5.25 X 1025 atoms of Au? 87.2 moles Au

Explanation:

Therefore, the volume of the rectangle is approximately 39.82045 cm³.

By simply understanding the length of a square box's sides, we can determine its volume. The square root of the length of a square box's edge gives the volume of a square box. V = s3, where s is the length of the square box's edge, is the formula for volume.

First, using the conversion formula 1 inch = 2.54 cm, we must convert the rectangle's length and breadth from inches to centimetres:

Length = 4.55 inches x 2.54 cm/inch = 11.561 cm

Width = 3.45 cm

Now we can calculate the volume of the rectangle:

Volume = Length x Width x Height

Volume = 11.561 cm x 3.45 cm x 1 cm

Volume = 39.82045 cm³ (rounded to five significant figures).

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The molarity of the perchloric acid solution is 7.75 M if 15.5 ml of base are needed to neutralise 13.6 ml of acid.

To determine the molarity of the perchloric acid, we can use the balanced chemical equation for the reaction between perchloric acid (HClO4) and barium hydroxide (Ba(OH)2):

2 HClO4 + Ba(OH)2 → Ba(ClO4)2 + 2 H2O

From the equation, we can see that 2 moles of perchloric acid react with 1 mole of barium hydroxide. Therefore, the mole ratio between the two substances is 2:1.

Given:

Volume of barium hydroxide solution (base) = 15.5 mL

Volume of perchloric acid solution (acid) = 13.6 mL

Molarity of barium hydroxide solution = 0.136 M

Determine the moles of barium hydroxide (base):

Moles of Ba(OH)2 = Molarity of Ba(OH)2 × Volume of Ba(OH)2 solution

= 0.136 M × 15.5 mL

= 2.108 mol

Use the mole ratio to find the moles of perchloric acid (acid):

Moles of HClO4 = (1/2) × Moles of Ba(OH)2

= (1/2) × 2.108 mol

= 1.054 mol

Calculate the molarity of perchloric acid (acid):

Molarity of HClO4 = Moles  / Volume of HClO4 solution

= 1.054 mol / (13.6 mL × 1 L/1000 mL)

= 7.75 M.

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The volume of the balloon is 6.24 L. The random motion of the gas particles is consistent with Newton's Laws of Motion.

the rule that states that the sum of the absolute temperature of the gas and the universal gas constant is equal to the product of the pressure and volume of a single gram of an ideal gas.

We can use the ideal gas law,

PV = nRT

P = pressure

V = volume

n = number of moles

R = gas constant

T = temperature

Now, we have to convert the temperature to Kelvin:

T = 2 + 273.15 = 275.15 K

We can substitute the values,

P = 0.5 atm

n = 0.48 mol

R = 0.08206 L·atm/(mol·K)

T = 275.15 K

PV = nRT

V = (nRT)/P

V = (0.48 mol * 0.08206 L·atm/(mol·K) * 275.15 K) / 0.5 atm

V = 6.24 L

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Answer:

D.

Explanation:

Heat is: Energy transferred by a temperature difference.

Hope this helps!

The mechanism of the glyceraldehyde-3-phosphate dehydrogenase does not involve a covalent intermediate. The correct option is C.

Glyceraldehyde-3-phosphate dehydrogenase is the enzyme that is involved in the glycolytic pathway and it will converts the glucose into the pyruvate. The conversion of the glyceraldehyde-3-phosphate (G3P) into the 1,3-bisphosphoglycerate (1,3-BPG) and will coupled with the reduction of the NAD+ to NADH. The mechanism of the GAPDH involves the several steps, but it will not involve the phosphorylation of the substrate using the ATP.

The enzyme uses the covalent intermediate to the transfer the hydride ion from the G3P to the NAD+, forming the NADH. The option C is correct.

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Answer:

"Chromatography"

Explanation:

(Chromatography is a procedure used in identifying the components) of a mixture on the basis of their size and solubility.

They are formed when two elements or compounds are combined physically and not chemically. chromatography.

Mixtures are divided into two categories: Homogeneous and heterogeneous.

Homogeneous mixtures- They have the same composition throughout their mass and there are no visible boundaries between the components of the mixture. Example- Sugar solution, salt solution, alloys, alcohol dissolved in water.

Heterogeneous mixture- They do not have the same composition throughout there are visible boundaries between the components of the mixture. Example- Milk, sand, and iron fillings, solution of, solution of.

To demonstrate the the given liquid is a mixture, the scientist can perform Chromatography.

Chromatography is based on the different rates of adsorption of components of a mixture on a suitable adsorbent.

When a drop of a mixture of substances is put on a chromatogram paper and the paper is dipped in a solvent, the substance that is more soluble in the solvent rises faster compared to others. And due to this difference in adsorption of different substances, they are separated by the method of chromatography.

If two spots are seen on a chromatogram that means the liquid is a mixture and if only one spot is visible, that suggests that liquid is a pure liquid.

Thus, they are formed when two elements or compounds are combined physically and not chemically. chromatography.

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Answer:

a.) Its compounds can only be chemically separated into the elements that make it up.

The compound of water can only be chemically separated into the elements that make it up. The correct option is A.

A compound is made up of atoms from different elements that have been chemically combined in a specific ratio.

A mixture is a combination of two or more substances in which no chemical reaction or combination occurs. Compounds are made up of different elements arranged in a specific order via chemical bonds.

Atoms/molecules are (chemically physically) combined in a compound so that the elements that comprise the compound (retain/lose) their identities and take on a new set of properties.

The most common chemical methods of isolation and purification are distillation, crystallization, adsorption, membrane procedures, absorption and stripping, and oxidation.

Because each water molecule is made up of two hydrogen atoms and one oxygen atom, water can only be decomposed chemically.

Thus, the correct option is A.

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Answer:

please follow me

Explanation:

A displacement reaction is the one when a more reactive substance displaces a less reactive one from its salt solution whereas a double displacement reaction is the one where a mutual exchange of ions happens between two compounds.

Answer:

1 g  +  10 g

Explanation:

Answer:

there are a thousand grams in a kilo

Answer:

yes, it is a homogeneous mixture because the different parts cannot be seen.

Explanation:

If a substance can be given a chemical formula can be considered to be a(n) compound.

A pure substance made up of two or more different elements combined chemically in a fixed ratio is called a compound.

Compounds are substances composed of different elements bonded chemically; only chemical reactions break the chemical bonds or create new chemical bonds leading a compound to form other substances.

Hence, if a substance can be given a chemical formula can be considered to be a(n) compound.

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Answer:

those small sediments begin to precipitate, condense on the ground and finally settle.

Explanation:

Sedimentation is a natural process, which occurs spontaneously in nature and promotes the formation of sedimentary rocks.

True. Do not use oil-based products such as Vaseline and body lotions because they destroy latex. Latex is a natural rubber, and when it comes into contact with oil-based products, it reacts chemically.

This reaction causes latex to degrade and lose its elasticity, making it prone to breakage. Therefore, it is important to avoid oil-based products when using latex products, such as condoms, gloves, and other medical supplies. Instead, use water-based products that are safe to use with latex. Water-based products are gentle on the skin and do not react chemically with latex, making them ideal for use with latex products.

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question we have

\(density = \frac{15}{14} \\ =1.0714285 ...\)

We have the final answer as

Hope this helps you

Answer:

If a nuclear reaction takes place without moderating material, the reaction will proceed at an uncontrolled and potentially explosive rate.

Explanation:

Moderating materials, such as substances that contain light atomic nuclei like water or graphite, are used in nuclear reactors to slow down the high-energy neutrons produced during a nuclear fission reaction. Slowing down the neutrons increases the likelihood of their interaction with other fissile nuclei, allowing for sustained and controlled nuclear reactions.

In the absence of a moderating material, the high-energy neutrons produced during a nuclear reaction will continue to have high velocities. These fast neutrons are less likely to cause additional fission reactions, leading to an inefficient use of fuel and an uncontrolled chain reaction. The lack of moderation can result in a rapid release of energy, known as a nuclear explosion or a runaway reaction, which can be highly destructive and dangerous.

Therefore, the presence of a moderating material is crucial to maintain a controlled and sustained nuclear reaction in applications such as nuclear power generation or research reactors.

Answer: 29.16%

Explanation:

The total of 2 percentages need to equal 100% so we subtract the percent they gave us from 100.

Answer:

absolutely correct....................

When a sodium atom becomes a sodium ion, it loses one electron from its outermost shell. The electron configuration of a sodium ion would be 1s22s22p6, which is the same as the electron configuration of a neon atom.

Neon is a noble gas with a full outer shell of electrons. It has a stable electron configuration, which means it is less likely to form compounds with other elements. This is similar to the sodium ion, which becomes stable by losing one electron and achieving a full outer shell.

So, if a sodium atom becomes a sodium ion, its new electron configuration will be the same as a neon atom. This change in electron configuration allows the sodium ion to become more stable.

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An element with seven valence electrons is likely to form one or two chemical bonds, as it will either gain or lose one electron to achieve a stable configuration of eight valence electrons.

This process of gaining or losing electrons is known as chemical bonding, which is the attraction between two or more atoms that results in the formation of a new compound. In the case of an element with seven valence electrons, it will typically bond with another element that has one or two valence electrons to achieve a full outer shell. This could lead to the formation of a covalent or ionic bond, depending on the electronegativity of the elements involved.

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Answer:

to convince society that the hypothesis is accurate