what is a chemical germicides that has been formulated for use on the skin and is registered and regulated by the food and drug administration? milady barbering

Answer:

v = 3 x 10^8 m/s

Explanation:

λ = 0.03 m

f = 1 x 10^10 Hz

v = ?

v = fλ

v = (1 x 10^10 Hz)(0.03 m)

v = 3 x 10^8 m/s

2gcm³ is the density of a glass fragment that has a mass of 1.5g and a volume of 0.75mL.

The term density is define as the ratio of mass and volume. The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimeter.

Density = mass / volume

Given:

Density = ?

Mass = 1.5 gram

Volume = 0.75 ml

By substituting this values in give equation we get,

Density = 1.5 / 0.75

= 2 gcm³

Thus, 2 gcm³ is the density of a glass fragment that has a mass of 1.5g and a volume of 0.75mL.

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Answer:

1.006 * 103

Explanation:

Add the number between 1 and 9 and add a decimal accordingly . so the answer is 1.006 multiplied by 10 raised to power 3

Answer and Explanation:

When methane (CH4) and chlorine (Cl2) react, a substitution reaction takes place. Specifically, the reaction is a halogenation reaction, in which one or more hydrogen atoms in the methane molecule are replaced by chlorine atoms. The reaction can be represented by the following equation:

CH4 + Cl2 → CH3Cl + HCl

In this equation, CH3Cl represents chloromethane, which is a type of organochlorine compound. The reaction is typically initiated by ultraviolet (UV) light or heat, and it proceeds through a series of free radical chain reactions. The products of the reaction are typically a mixture of chloromethane and hydrogen chloride (HCl) gas.

Answer:

For the most part, in mitosis, diploid cells are partitioned into two new diploid cells, while in meiosis, diploid cells are partitioned into four new haploid cells.The daughter cells produced by mitosis are identical, whereas the daughter cells produced by meiosis are different because crossing over has occurred.

Explanation:

The concentration of the NaOH solution is 10.00 g/dm³.

To calculate the concentration in g/dm³ of a solution of NaOH containing 0.25 moles in 1 dm³, we need to know the molar mass of NaOH.

The molar mass of NaOH is calculated as follows:

Na (Sodium) = 22.99 g/mol

O (Oxygen) = 16.00 g/mol

H (Hydrogen) = 1.01 g/mol

Molar mass of NaOH = 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 40.00 g/mol

Now, we can calculate the concentration (C) using the formula:

C = (moles of solute) / (volume of solution in dm³)

C = 0.25 moles / 1 dm³

C = 0.25 mol/dm³

To convert moles to grams, we can multiply the molar mass by the number of moles:

Concentration in g/dm³ = (0.25 mol/dm³) * (40.00 g/mol)

Concentration in g/dm³ = 10.00 g/dm³

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Liters of Oxygen = 11.5 liters of Oxygen gas produced from 45.3g of MnO3.

Oxygen gas (O2) is a colorless, odorless, tasteless gas that is essential for life on Earth. It makes up about 21% of the air we breathe and is the most abundant element in the Earth's atmosphere. Oxygen gas is highly reactive and participates in many chemical reactions, including combustion and respiration. In combustion, oxygen gas combines with other elements such as carbon, hydrogen, and other compounds to form oxides and release energy as heat. In respiration, oxygen gas is used by cells to produce energy.

Manganese trioxide (MnO3) is an inorganic compound composed of manganese and oxygen atoms. When MnO3 is heated, it will produce oxygen gas. The amount of oxygen gas produced from 45.3g of MnO3 can be calculated using the following equation:

Moles of Oxygen = 45.3g/Molecular Weight of MnO3

Molecular Weight of MnO3 = 87.9g/mol

Moles of Oxygen = 0.517 mol

Liters of Oxygen = 0.517 mol x 22.4 L/mol

Liters of Oxygen = 11.5 liters of Oxygen gas produced from 45.3g of MnO3.

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To determine the amount of heat needed to melt 45.00 g of ice at 0°C, we need to use the formula:

Q = m * Lf

Where Q represents the heat required, m is the mass of the substance (ice), and Lf is the latent heat of fusion.

Given that the mass of the ice is 45.00 g and the latent heat of fusion of water is 333.7 J/g, we can substitute these values into the formula:

Q = 45.00 g * 333.7 J/g

Q ≈ 15,020 J

Therefore, the amount of heat needed to melt 45.00 g of ice at 0°C is approximately 15,020 J.

The latent heat of fusion represents the energy required to change a substance from a solid to a liquid state without changing its temperature. In this case, the ice needs this amount of energy to break the intermolecular bonds and transition into liquid water at 0°C. The value obtained (15,020 J) represents the heat energy absorbed during the process of melting the ice.

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Answer:

B changing states of matter (solid to liquid)

The solubility product of the chromate ion (CrO₄²⁻) is 1.17  x 10⁻¹² .

The solubility product denoted as Ks, of an ionic compound is defined as the product of the concentration of the ions that exist in equilibrium with the solid compound in a saturated solution.

The balanced chemical equation is given as,

Ag₂CrO₄ ⇌ 2Ag⁺ + CrO₄²⁻

Thus,

[Ag⁺] = 2 [CrO₄²⁻]

By using the formula of Ksp we get,

Ksp = [Ag⁺] [CrO₄²⁻]

⇒ Ksp =  2 [CrO₄²⁻]  [CrO₄²⁻]

⇒ Ksp = 2 [CrO₄²⁻]²

Substituting the values of Ksp we get,

2.76 x 10⁻¹² = 2 [CrO₄²⁻]²

⇒ [CrO₄²⁻]² = 2.76 x 10⁻¹² /2

⇒ [CrO₄²⁻]² = 1.38  x 10⁻¹²

⇒ [CrO₄²⁻] = 1.17  x 10⁻¹²

Hence, the solubility product of the chromate ion (CrO₄²⁻) is 1.17  x 10⁻¹² .

​

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Explanation:

Potassium oxide is an ionic compound formed by combining potassium and oxygen. It carries the chemical formula K2O. Potassium cannot be found free because it is too reactive. It has valency +1 and combines readily with oxygen atoms forming K2O.

Answer:

The Correct answer is

K+O2------>K2O

balancing it will be

4K+O2----->2K2O

The Law of Conservation of Mass states that mass cannot be created or destroyed in a chemical reaction; it can only be changed from one form to another.

This means that the total mass of substances before the reaction is the same as the total mass of substances after the reaction. Balancing a chemical equation ensures that the Law of Conservation of Mass is observed. It ensures that the same amount of each element that was present before the reaction is also present after the reaction.
Coefficients are used to balance chemical equations. They are placed in front of the reactants and products in a reaction to ensure that the number of atoms of each element on the left side of the equation is equal to the number of atoms of each element on the right side.
In a physical or chemical change, the mass of the reactants is equal to the mass of the products. This is because mass is conserved according to the Law of Conservation of Mass, and so no matter what form a substance takes, the same amount of mass will remain.

However , In a chemical change, the mass of the reactants is equal to the mass of the products obtained from the reaction. Thus, mass is always conserved during a physical or chemical change.

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Answer:

c6h12o6 + 6o2 = 6co2 + 6h20

Explanation:

c6h12o6 + 6o2 = 6co2 + 6h20

0 = 18 18

h = 12 12

c = 6 6

We can deduce here that the theoretical yield of benzhydrol is 0.7279 grams, and the percent yield is 29.53% based on the given masses of benzophenone and the product.

Given:

Mass of benzophenone (limiting reagent) = 0.72 grams

Mass of product (benzhydrol) = 0.215 grams

The number of moles of benzophenone:

Molar mass of benzophenone = 182.217 g/mol

Moles of benzophenone = Mass / Molar mass = 0.72 g / 182.217 g/mol = 0.003957 mol

The stoichiometry of the reaction:

From the balanced equation: Benzophenone + Triphenylmethanol → Benzhydrol + Triphenylmethane

The stoichiometry indicates that 1 mol of benzophenone produces 1 mol of benzhydrol.

The theoretical yield of benzhydrol:

Theoretical yield = Moles of limiting reagent (benzophenone) × Molecular weight of benzhydrol

The molecular weight of benzhydrol (C13H12O) = 184.237 g/mol

Theoretical yield = 0.003957 mol × 184.237 g/mol = 0.7279 grams

The percent yield:

Percent yield = (Actual yield / Theoretical yield) × 100%

Percent yield = (0.215 g / 0.7279 g) × 100% = 29.53%

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The complete question is:

Assuming that benzophenone (182.217 g/mol) is the limiting reagent, calculate the theoretical and percent yields, reacting with triphenylmethanol. You must show all steps and units in your calculations to receive full credit. Student given 0.72 grams benzophenone 0.215 grams product.

Answer:

A - speed up

Explanation:

Artificial selection, also called "selective breeding”, is where humans select for desirable traits in agricultural products or animals, rather than leaving the species to evolve and change gradually without human interference, like in natural selection.

Answer:

Its a good conductor because its a metal

Answer:

periodic table

Explanation:

in its magnetic properties and chemical activity it resembles iron and cobalt

Answer:

Explanation:

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

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

From the question

mass = 500 g

volume = 67 mL

We have

\(density = \frac{500}{67} \\ = 7.462686\)

We have the final answer as

Hope this helps you

Energy releases to the surroundings = -32.2 kJ

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

mass of coffee(m) = 140 g

∆T = temperature difference :

final temperature - initial temperature = 20-75=-55°C

specific heat coffee= specific heat water = 4.18 J/g° C  

The heat releases :

\(\tt Q=140\times 4.18\times -55\\\\Q=-32186~J\approx -32.2~kJ\)

Explanation:

I. husking

ii. use magnet

III. husking

iv. floatation

v. Fractional distillation

Answer:

C: Ability to react. Sorry if its wrong!

Explanation:

Answer:

60.8%

Explanation:

We'll begin obtaining the molar mass of cobalt(II) fluoride, CoF2. This can be done as shown below:

Molar mass of CoF2 = 59 + (19x2) = 97g/mol.

The percentage composition of cobalt in cobalt(II) fluoride, CoF2 is given by:

Mass of Co/Molar Mass of CoF2 x 100

=> 59/97 x 100 = 60.8%

Therefore, the percentage composition of cobalt in cobalt(II) fluoride, CoF2 is 60.8%

Answer:

The mass left after 24.6 years is 25.0563 grams

Explanation:

The given parameters are;

The mass of the hydrogen-3 = 100 grams

The half life of hydrogen-3 which is also known as = 12.32 years

The formula for calculating half-life is given as follows;

\(N(t) = N_0 \times \left (\dfrac{1}{2} \right )^{\dfrac{t}{t_{\frac{1}{2} }} }\)

Where;

N(t) = The mass left after t years

N₀ =  The initial mass of the hydrogen-3 = 100 g

t = Time duration of the decay = 24.6 years

\(t_{\frac{1}{2} }\) = Half-life = 12.32 years

\(N(24.6) = 100 \times \left (\dfrac{1}{2} \right )^{\dfrac{24.6}{12.32}} } = 25.0563\)

The mass left after 24.6 years = 25.0563 grams.

Answer: D. Processing

Explanation: 100% on topic test also its in my e notes.

Craik and Lockhart has proposed theory of memory processing. Thus, option D is correct.

Craik and Lockhart proposed the theory for the processing of the level of memory. The memory in humans can be sensory memory, working memory, and long-term memory.

The long term memories have been stored in the deeper cells and the increased or strong stimulation of the processing results in the stronger retention of the memories. Thus, option D is correct.

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Answer:

20 to 50 million

Explanation:

When transferring a chemical substance into a secondary container for transport, it is important to ensure the container is in good condition, properly labeled, sealed, packaged and compatible with the substance.

Making sure that the secondary container is in good condition and free of any defects that could cause leaks or spills.

Properly labeling the container with the chemical name, concentration, and any relevant hazard information, such as the UN number, or any warnings and precautions.

Properly sealing the container to prevent any leaks or spills during transport. This may include using screw caps, plugs, or other types of closures that create a tight seal.

Properly packaging the container in a larger box or crate, and securing it with padding or other materials to prevent movement during transport.

Make sure that the secondary container is compatible with the chemical substance, meaning that the container material should not react with the chemical, and also it should be able to withstand the pressure, temperature, and other environmental conditions that the substance may encounter during transport.

In addition, the secondary container should be designed to prevent the evaporation of volatile materials or the leakage of toxic liquids.

Following all the regulations, guidelines, and laws related to the transport of chemical substances.

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Explanation:

Q. What can you infer about magnetic domains from the fact that they are arrangements of atoms? The individual domains are extremely small.

The conversion of solar energy into chemical energy occurs in the process of photosynthesis.

A crucial metabolic activity performed by plants, algae, and some microorganisms is photosynthesis. It entails the absorption of solar energy, its conversion to chemical energy, and its storage as glucose and other organic compounds.

Chlorophyll pigments in the chloroplasts of plant cells absorb sunlight during photosynthesis. Using this energy, a series of chemical processes transform water (H2O) and carbon dioxide (CO2) into glucose (C6H12O6) and oxygen (O2).

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The hybridization of the carbon atoms in acetylene is sp.  Acetylene (C2H2) is a colorless and highly flammable gas that has a distinct odor.

It is made up of two carbon atoms linked by a triple bond and two hydrogen atoms. Acetylene is used as a fuel in oxy-acetylene welding and cutting, as well as in the production of a variety of chemicals.  Hybridization is a concept in chemistry that describes the mixing of atomic orbitals into new hybrid orbitals.

Hybrid orbitals are used to explain the bonding in molecules. Both carbon atoms in acetylene are sp. because they are bonded to two other atoms and have no lone pairs. The hybridization of the carbon atoms in acetylene is sp.

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