. Anthony proposed an experiment during which he would test the friction created when a skateboard is rolled along a flat surface. He selected three different surfaces (carpet, tile, and concrete) each with three different textures (dry, wet, and icy). His teacher told him that he would need to clarify his experiment before his project would be approved. Which of the following best describes why Anthony's project was rejected? A. Anthony's project has two independent variables. B. Anthony does not have a problem that can be tested. C. The skateboard will not be able to roll along the carpet. D. The friction created by a skateboard cannot be measured.​

Answer:

we use atom in our sentences all the time

Explanation:

that what i put

Hi!

\(\\ \sf\rightarrow pH=-log[H^+]\)

\(\\ \sf\rightarrow -log[H^+]=6.1\)

\(\\ \sf\rightarrow log[H^+]=-6.1\)

\(\\ \sf\rightarrow [H^+]=10^{-6.1}\)

\(\\ \sf\rightarrow [H^+]=7.94M\)

The major thermodynamic product of the reaction between C₅H₈ and HBr is the most stable product, which is usually the one with the lowest free energy. On the other hand, the major kinetic product is the product that is formed through a faster and less controlled reaction pathway.

This  thermodynamic product product is formed through a slower and more controlled process, which allows for the formation of stronger chemical bonds and results in a more stable final product.

This  kinetic product  is formed due to its lower activation energy, which makes it easier to form, but it may not necessarily be the most stable product.

In the case of C₅H₈ and HBr, the reaction can result in both thermodynamically and kinetically stable products, meaning that there can be multiple products formed, each with different stability properties. The thermodynamically stable product is the one with the lowest free energy, while the kinetically stable product is the one with the lower activation energy.

In summary, the major thermodynamic product of the reaction is the most stable product, while the major kinetic product is the product that is formed through a faster and less controlled reaction pathway. However, it is important to note that the exact products of the reaction can vary based on the reaction conditions and reactant concentrations.

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Complete question:

What are themajor thermodynamic and kinetic products of the reaction.

C₅H₈ + HBr (1 equivalent) ------> thermodynamically stable + Kinetically stable

As the hour of her new job approached, Emma could feel her excitement peak.

"Peak" is a synonym to "intensify" in this context because it means to reach the highest point or level of something. In the given passage, Emma's excitement is growing stronger and stronger as the time for her volunteer job approaches.

When her excitement "peaks," it means that it has reached the highest point of intensity, just like when something is intensified, it becomes stronger or more intense.

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Answer:

D. all of the above

Explanation:

Petroleum is used to make heating oil, kerosene, and gasoline. therefore all of the above is correct, Option D. This is further explained below.

Generally, Petroleum is simply defined as a liquid combination of hydrocarbons found in a geological layers and then extracted and purified to generate fuels such as petrol.

In conclusion, Petroleum is used to produce a number of products e.g a. heating oil, kerosene, and gasoline.

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The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. The frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. However, for the photoelectric effect to occur, the frequency of the incident light must be above a certain threshold frequency.

The threshold frequency is the minimum frequency of light required to dislodge electrons from the material. Below this threshold frequency, regardless of the intensity or duration of the light, no electrons will be emitted.

This behavior can be explained by the particle-like nature of light, where light is composed of discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency. Only photons with energy greater than or equal to the binding energy of the electrons in the material can dislodge them.

Therefore, the frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

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The frequency of the electromagnetic wave is 8.1 x 10 ¹⁸ Hz.

The speed of light in a vacuum is given as 3.00 x 10⁸ m/s. The speed of light is also related to the wavelength and frequency of the electromagnetic wave by the equation:

c = λν

where c is the speed of light, λ is the wavelength, and ν is the frequency.

Rearranging the equation to solve for frequency, we get:

ν = c/λ

Substituting the values given in the problem, we get:

ν = (3.00 x 10⁸ m/s) / (3.7 x 10⁻¹¹ m)

ν = 8.1 x 10 ¹⁸ Hz

Therefore, the frequency of the electromagnetic wave is 8.1 x 10 ¹⁸ Hz, and the correct answer is (A) 8.1 x 10 ¹⁸ Hz.

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Answer:

a. Increase

b. 539 L

Explanation:

Step 1: Given data

Step 2: Calculate the final volume of the gas

The pressure of the gas is inversely proportional to the volume. So, as the pressure decreases, the volume must increase. Assuming constant temperature and ideal behavior, we can calculate the final volume of the gas using Boyle's law.

P₁ × V₁ = P₂ × V₂

V₂ = P₁ × V₁/P₂

V₂ = 760 mmHg × 200.0 L/282 mmHg = 539 L

Answer:

A. bacteria

Explanation:

can i have brainlest?

The main ions present in the electrolytic cell during the electrolysis of 4 mol/L nitric acid are H+, NO3-, OH-, and NO2. Additionally, water (H2O) is also present as the solvent.

Hydrogen ion (H+): When nitric acid dissolves in water, it ionizes to release hydrogen ions, which are positively charged. The chemical symbol for the hydrogen ion is H+.

Nitrate ion (NO3-): Nitric acid also dissociates to form nitrate ions. These ions have a negative charge, and their chemical symbol is NO3-.

Hydroxide ion (OH-): Water molecules can undergo self-ionization, producing hydroxide ions and hydrogen ions. In the presence of water, nitric acid can also lead to the formation of hydroxide ions, OH-.

Nitrogen dioxide (NO2): During the electrolysis process, some nitrate ions may be oxidized at the anode to form nitrogen dioxide gas. The chemical symbol for nitrogen dioxide is NO2.

Water (H2O): Water itself is present in the electrolytic cell. It serves as the solvent and also participates in ionization reactions.

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Answer: 4.88 g/mol. and helium

Explanation:

To find the molar mass of the gas, we can use the ideal gas law equation which is PV=nRT where:

P = pressure = 2.000 atm

V = volume = 50.00 L

n = number of moles

R = gas constant = 0.08206 L·atm/K·mol

T = temperature = 273.15 K

First, we need to find the number of moles of the gas:

PV = nRT

n = PV/RT

n = (2.000 atm)(50.00 L)/(0.08206 L·atm/K·mol)(273.15 K)

n = 1.844 mol

Now, we can find the molar mass of the gas by dividing its mass by the number of moles:

molar mass = mass/number of moles

mass = 9.00 g

molar mass = 9.00 g/1.844 mol

molar mass = 4.88 g/mol

Therefore, the molar mass of the gas is 4.88 g/mol.

To determine what gas this is, we can compare the molar mass of the gas to the molar masses of known gases. The molar mass of 4.88 g/mol is closest to that of helium (4.00 g/mol). Therefore, this gas is most likely helium.

With a radius of 15,299.4 miles (24,622 kilometers), Neptune is about 4 times wider than Earth. If Earth have been the size of a nickel, Neptune would be about as big as a baseball.

From an common distance of 2.8 billion miles (4.5 billion kilometers), Neptune is 30 astronomical units away from the Sun.

Image end result for How is the outer layer of earth one-of-a-kind from the outer layer of Neptune

The outermost layer of Neptune is the atmosphere, forming about 5-10% of the planet's mass, and extending up to 20% of the way down to its core.

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The extent of Neptune is 6.3 x 1013 km3. You could healthy fifty seven Earths inner Neptune and nevertheless have room to spare. A day on Earth is 24 hours, but a day on Neptune is 16 hours and 6 minutes. A yr on Earth is, um, 1 12 months obviously, whilst a year on Neptune is 164.79 years.

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Answer:

= 3.456 × 1011

Explanation:

Answer:

arms

Explanation:

because arms can be metric system of our body

Answer:

nose and the tip of an outstretched middle finger.

Answer:

A plastic ball

Explanation:

A plastic ball has less density than water because plastic has low density so

Biotechnology is the use of living organisms or other biological systems in the manufacture of drugs or other products or for environmental management, as in waste recycling: includes the use of bioreactors in manufacturing, microorganisms to degrade oil slicks or organic waste, genetically engineered bacteria to produce human hormones, and monoclonal antibodies to identify antigens.

Biotech offers the possibility of improving human health, the environment, and agriculture while creating more sustainable modes of production.

Answer: Pb(NO3)2(aq) + 2KI(aq)  —> PbI2(s) + 2KNO3(aq)

Explanation:

Answer:

C

Explanation:

The specific heat capacity=quantity of heat in joule/mass×change in temperature

from this question the quantity of heat is 75250,the mass is 2000 and the change in temperature is 50-30

which is 20

therefore

c=75250/2000×20

c=75250/40000

c=1.88

I hope this helps

Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

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ANSWER

Option A

EXPLANATION

Base is a substance that will reacts with an acid that to produce salt and water only.

Base is also a substance that produce hydroxide ions in an aqueous solution.

Below are the properties of a base

1. A base has a pH value greater than 7

2. A base is slippery to touch

3. A base has the ability to release hydroxide ions in aqueous solution.

4. A base has the ability to dissolve fats and oils.

Hence, base does not have sour taste which make option A the correct answer

Therefore, the correct answer is option A

Answer:

I’m pretty sure it’s C

Explanation:

AP Ex

Answer:

c. ethylene glycol (HOCH2CH2OH)

Explanation:

Ethylene glycol is polar in nature. The -OH groups in it are able to form hydrogen bond with ethanol molecule, which makes it soluble in ethanol.

A chemical compound is a combination of different elements that are held together by chemical bonds.

Ethanol is an organic chemical compound that is known as simple alcohol.

It is naturally produced when sugar is fermented by yeast.

The compound that will be most soluble in ethanol is ethylene glycol (HOCH2CH2OH). This is because this compound is polar in nature and has the ability to form hydrogen bond and makes it soluble in ethanol.

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Answer:

because those are the only thermometers that are truly accurate for kelvins

Explanation:

The Kelvin temperature in thermometers is used by scientists because it provides a temperature where zero indicates the complete absence of thermal energy.

All thermometers have a scale on them that we use to find the temperature, known as a temperature scale. Kelvin proposed that the temperature interval from the ice point to the steam point be defined as 100° containing earlier centigrade scales.

Lord Kelvin had given an absolute temperature scale based on the Carnot cycle.  The zero point is 273.15 on Kelvin’s scale below that of the Celsius scale.

On the kelvin scale, Each division is called a Kelvin (K) and is equal to a degree on the Celsius scale. On the Celsius scale, zero degrees is the freezing point of water while on the Kelvin scale the zero point is at absolute zero temperature.

Therefore, 0 K is equal to - 273.15°C, and 0°C is equal to 273.15 kelvins. A mathematical expression that gives the relation between the Celsius and Kelvin scales:

Temperature (K) = Temperature (°C) + 273

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Answer: A

Explanation:

everything else is true

Li₃PO₄ + 3 Zn(NO₃)₂ → 3 LiNO₃ + Zn₃(PO₄)₂. In this balanced equation, one of the products is Zn₃(PO₄)₂. To ensure that the equation is balanced, we need 3 moles of Zn(NO₃)₂ for every 1 mole of Li₃PO₄.

In a chemical reaction, a product is a substance that is formed as a result of the chemical reaction. It is the end result of a chemical reaction, and it is produced by the rearrangement of atoms and/or ions of the reactants.

In the given equation, we end up with 1 mole of Zn₃(PO₄)₂ for every 3 moles of Zn₃(PO₄)₂. This means that the molar ratio of Zn₃(PO₄)₂ to Zn₃(PO₄)₂ is 1:3, indicating that we need three times as much Zn₃(PO₄)₂ as Zn₃(PO₄)₂ to balance the equation. Therefore, one of the products, Zn₃(PO₄)₂, must be produced in a smaller quantity than the other product, LiNO₃.

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Answer:

Basic

Explanation:

pH = -log[H⁺] = - log(1.87 x 10⁻¹¹) = 10.73 (basic solution)

Answer:

basic

Explanation:

Answer:

A. catalyst.

Explanation:

Catalyst is something that causes things to decay. I think catalyst is the right answer from what i know from Miraculous Ladybug... Did you know the show was originally going to be an anime?