Find the pH of HCl with a concentration of 0.00006M
Round to the nearest whole number

Answer:

Nvr XD

Explanation:

Answer:

the world may never know

Explanation:

answer is B value of approximation

solving

The heat of vaporization for water is 40.7 kJ/mol, which means that it takes 40.7 kJ of energy to convert 1 mole of water from a liquid to a gas phase.

The energy required to boil the water is given as 63.8 kJ.

We can set up a proportion using these values:

40.7 kJ/1 mol = 63.8 kJ/x mol

To solve for x (the number of moles of water), we can cross-multiply and solve the equation:

40.7 kJ * x mol = 63.8 kJ * 1 mol

x mol = (63.8 kJ * 1 mol) / 40.7 kJ

x mol ≈ 1.57 mol

Since we know the molar mass of water is approximately 18.015 g/mol, we can convert moles to grams:

1.57 mol * 18.015 g/mol ≈ 28.29 g

Therefore, the mass of the sample of water is approximately 28.29 grams.

Answer:

\(\huge\boxed{\sf V_2 = 5.68 \ L}\)

Explanation:

Volume 1 = \(V_1\) = 3.95 L

Temperature 1 = \(T_1\) = -45 °C + 273 =  228 K

Temperature 2 = \(T_2\) = 55 °C + 273 = 328 K

Volume 2 = \(V_2\) = ?

\(\displaystyle \frac{V_1}{T_1} = \frac{V_2}{T_2}\) (Charles law)

Put the given data in the formula.

\(\displaystyle \frac{3.95}{228} = \frac{V_2}{328} \\\\Cross \ Multiply\\\\3.95 \times 328 = V_2 \times 228\\\\1295.6 = V_2 \times 228\\\\Divide \ both \ sides \ by \ 228\\\\1296.5/228 = V_2\\\\5.68 \ L = V_2\\\\V_2 = 5.68 \ L\\\\\rule[225]{225}{2}\)

Explanation:

Eating and digesting cheese pizza is a Chemical Change because it is an irreversible reaction. It can't be undone.

Answer: Emily can measure the density of the piece of metal to find out what it is. Density is a physical property.

Explanation:

The density of a substance can be found by dividing its mass by its volume. No chemical reaction is involved in measuring the mass nor the volume; therefore, density is a physical property.

In space light waves move fastest, which is C. This is due to the fact that space is completely open and unrestricted and contains nothing that would do so.

What is Light waves?
The region of the electromagnetic spectrum that the human eye perceives as light, or visible light, is made up of electromagnetic radiation. Typically, visible light is characterised as having wavelengths between 400 and 700 nanometers (nm), or frequencies between 750 and 420 terahertz, which fall between the longer-wavelength infrared and the shorter-wavelength ultraviolet (with shorter wavelengths). The term "light" in physics can be used to more broadly describe electromagnetic radiation of any wavelength, whether or not it is visible. Gamma rays, X-rays, microwaves, and radio waves are all forms of light in this sense. Intensity, propagation direction, frequency or wavelength spectrum, and polarisation are the four main characteristics of light.

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Answer:

B

Explanation:

I believe it is compound B, because ionic compounds can form crystals, and they can conduct electricity when dissolved in water.

I hope it helps!!

Compound B is an ionic compound as it is hard,brittle and conducts electricity.

Ionic compound or electrovalent compound is a type of compound which is formed between two elements when there is an exchange of electrons which takes place between  the atoms resulting in the formation of ions.

When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge  and forms an ion called the anion.

As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.They are hard, malleable, ductile and good conductors of heat and electricity.They have high boiling points.

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Step 1

% by mass:

Mass of solute ---- 100 of solution

Mass of solution = mass of solute + mass of solvent = 55.0 g + 137 g = 192 g

Solute = NH4Cl

Solvent = Water (H2O)

-----------------------------

Step 2

Procedure:

55.0 g NH4Cl --------- 192 g solution

X ---------- 100 g solution

X = 29 g NH4Cl = 29 % by mass approx.

Answer: 29 % by mass

Answer:

b. 760 g

Explanation:

The mass of the solution = 800 g

5% of NaCl by mass of the solution can be determined as follows;

    5% of 800  =  \(\frac{5}{100}\) × 800

                       = 5 × 8

                       = 40 g

The mass of NaCl in the solution is 40 g.

The mass of water = mass of solution - mass of NaCl

                               = 800 - 40

                              = 760 g

Therefore, the mass of water required is 760 g.

Answer:

The answer is  Muscle, Stomach, chews or sucks.

Explanation:

These are the roles they play.

Answer:

Actinides

Explanation:

They are defined as "any of the series of fifteen metallic elements from actinium (atomic number 89) to lawrencium (atomic number 103) in the periodic table. They are all radioactive, the heavier members being extremely unstable and not of natural occurrence"

Answer:

Actinides

Explanation:

Actinides are radioactive and human-made elements.

Answer:

1500 milligrams

The 85th percentile of blood pressure readings is approximately 137.64. a. To calculate the z-score for a blood pressure reading of 140, we can use the formula:

z = (x - μ) / σ

where x is the value (140 in this case), μ is the mean (121), and σ is the standard deviation (16).

Substituting the values into the formula:

z = (140 - 121) / 16

z ≈ 1.19 (rounded to two decimal places)

b. To find the proportion of Canadians with high blood pressure, we need to calculate the area under the normal distribution curve for values above 140. This can be done by finding the cumulative probability using the z-score.

Using a standard normal distribution table or a calculator, we can find that the cumulative probability corresponding to a z-score of 1.19 is approximately 0.881.

Therefore, the proportion of Canadians with high blood pressure is approximately 0.881 (rounded to four decimal places).

c. To find the proportion of Canadians with systolic blood pressure in the range from 100 to 140, we need to calculate the area under the normal distribution curve between these two values.

Using the z-scores corresponding to 100 and 140, we can find the cumulative probabilities for each value. The cumulative probability for a z-score of -1.25 (corresponding to 100) is approximately 0.105, and the cumulative probability for a z-score of 1.19 (corresponding to 140) is approximately 0.881 (as calculated in part b).

The proportion with systolic blood pressure between 100 and 140 is the difference between these two probabilities:

Proportion = 0.881 - 0.105 ≈ 0.776 (rounded to four decimal places)

d. The 85th percentile represents the value below which 85% of the blood pressure readings fall. To find the 85th percentile, we need to determine the z-score that corresponds to an area of 0.85 under the normal distribution curve.

Using a standard normal distribution table or a calculator, we can find that the z-score corresponding to an area of 0.85 is approximately 1.04.

To find the actual blood pressure reading at the 85th percentile, we can use the z-score formula:

x = μ + (z * σ)

Substituting the values:

x = 121 + (1.04 * 16)

x ≈ 137.64

Therefore, the 85th percentile of blood pressure readings is approximately 137.64.

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Answer:

Basaltic magma is formed through dry partial melting of the mantle. The mantle lies just below the crust of the earth. Basalts make up most of the ocean’s crust; this is why basaltic magma is typically found in oceanic volcanoes. See also what substances are emitted from fumaroles? What type of melting produces most basaltic magmas?

Explanation:

please add me as brainliest..

Walt's mistake is described as: "Only dead plants form natural gas. What is natural gas Natural gas is a fossil fuel that is generated deep beneath the earth's surface. It's a colorless, odorless gas that can be utilized as a fuel for vehicles, heating, cooking, and electricity generation.

It is primarily made up of methane, a hydrocarbon chemical compound. When natural gas is produced, it is accompanied by smaller quantities of hydrocarbon liquids and non-hydrocarbon gases.What is the best description of Walt's mistake The best description of Walt's mistake is that he believed "Only dead plants form natural gas. This assertion is incorrect since natural gas is produced by both land plants and animals.

The dead organic matter is then converted into natural gas through a process known as kerogen formation. Hence, the statement "Only dead plants form natural gas" is incorrect, and it is important to make sure your facts are right before making any assertions. the natural gas is not solely formed from dead plants. Land plants and animals can also produce natural gas. The statement "Natural gas only requires extreme pressure to form" is also incorrect because natural gas is created over a long period of time, usually millions of years.

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The reaction you provided, C2H6(g) → C2H2(g) + 2H2(g), involves the decomposition of ethane (C2H6) into acetylene (C2H2) and hydrogen gas (H2).

To calculate ΔH for this reaction using Hess's Law, we need to consider a series of reactions for which the enthalpy changes (ΔH) are known.

First, we can consider the combustion of ethane, which is an exothermic reaction:

C2H6(g) + 7/2O2(g) → 2CO2(g) + 3H2O(g) ΔH1

Next, we can consider the combustion of acetylene, which is also exothermic:

C2H2(g) + 5/2O2(g) → 2CO2(g) + H2O(g) ΔH2

Lastly, we can consider the combustion of hydrogen gas, which is exothermic as well:

H2(g) + 1/2O2(g) → H2O(g) ΔH3

To obtain the target reaction, we can subtract the known reactions in such a way that the reactants on one side cancel out with the products on the other side. In this case, we need to reverse the second reaction and multiply the third reaction by 2:

2CO2(g) + H2O(g) → C2H2(g) + 5/2O2(g) -ΔH2

2H2O(g) → 2H2(g) + O2(g) 2ΔH3

By adding these reactions together, the intermediate products and reactants cancel out, leaving us with the desired reaction:

C2H6(g) → C2H2(g) + 2H2(g)

The enthalpy change for the desired reaction, ΔH, is the sum of the enthalpy changes for the individual reactions. Therefore:

ΔH = ΔH1 + (-ΔH2) + 2ΔH3

By substituting the known values of ΔH1, ΔH2, and ΔH3, you can calculate the value of ΔH for the reaction using Hess's Law.

In summary, Hess's Law allows us to calculate the enthalpy change for a desired reaction by manipulating known reactions with known enthalpy changes.

By canceling out intermediate products and reactants, we can arrive at the desired reaction and determine its enthalpy change.

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Answer: I think it’s C

Explanation:

I think it’s C because animal cells do not have a cell wall and the cell wall is unique to plant cells

Answer:

The answer is Primary.

b. fossils we know about them because of the discovery .

The Earth was the home of the dinosaurs for at least 230 million years, according to a wealth of fossilized bones, teeth, trackways, and other physical evidence. But no dinosaur bones have been discovered in strata younger than 66 million years old, not even a single trace.

In June 2022, Dippy returned to the Natural History Museum as a component of a traveling exhibition. The replica will then be loaned to another institution for a period of three years. Applications for the future location were made available by the Museum in March 2022.

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Answer:

Why does the Moon have phases?

At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated (position 1 in illustration). In other words, the Moon is between Earth and Sun. At first quarter, the half-lit Moon is highest in the sky at sunset, then sets about six hours later (3). At full Moon, the Moon is behind Earth in space with respect to the Sun. As the Sun sets, the Moon rises with the side that faces Earth fully exposed to sunlight (5).

At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated (position 1 in illustration). In other words, the Moon is between Earth and Sun. At first quarter, the half-lit Moon is highest in the sky at sunset, then sets about six hours later (3). At full Moon, the Moon is behind Earth in space with respect to the Sun. As the Sun sets, the Moon rises with the side that faces Earth fully exposed to sunlight (5).

The Moon has phases because it orbits Earth, which causes the portion we see illuminated to change. The Moon takes 27.3 days to orbit Earth, but the lunar phase cycle (from new Moon to new Moon) is 29.5 days. The Moon spends the extra 2.2 days "catching up" because Earth travels about 45 million miles around the Sun during the time the Moon completes one orbit around Earth.

At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated (position 1 in illustration). In other words, the Moon is between Earth and Sun. At first quarter, the half-lit Moon is highest in the sky at sunset, then sets about six hours later (3). At full Moon, the Moon is behind Earth in space with respect to the Sun. As the Sun sets, the Moon rises with the side that faces Earth fully exposed to sunlight (5).

You can create a mockup of the relationship between Sun, Earth, and Moon using a bright lamp, a basketball, and a baseball. Mark a spot on the basketball, which represents you as an observer on Earth, then play with various alignments of Earth and Moon in the light of your imaginary Sun.

When is the Harvest Moon?

The full Moon that occurs closest to the autumnal equinox is commonly referred to as the "Harvest Moon," since its bright presence in the night sky allows farmers to work longer into the fall night, reaping the rewards of their spring and summer labors. Because the equinox always falls in late September, it is generally a full Moon in September which is given this name, although in some years the full Moon of early October earns the "harvest" designation.

Why do we always see the same side of the Moon from Earth?

The Moon always shows us the same face because Earth's gravity has slowed down the Moon's rotational speed. The Moon takes as much time to rotate once on its axis as it takes to complete one orbit of Earth. (Both are about 27.3 Earth days.) In other words, the Moon rotates enough each day to compensate for the angle it sweeps out in its orbit around Earth.

Gravitational forces between Earth and the Moon drain the pair of their rotational energy. We see the effect of the Moon in the ocean tides. Likewise, Earth's gravity creates a detectable bulge -- a 60-foot land tide -- on the Moon. Eons from now, the same sides of Earth and Moon may forever face each other, as if dancing hand in hand, though the Sun may balloon into a red giant, destroying Earth and the Moon, before this happens.

When does the young Moon first become visible in the evening sky?

There is no real formula for determining the visibility of the young Moon. It depends on several factors: the angle of the ecliptic (the Moon's path across the sky) with respect to the horizon, the clarity of the sky (how much dust and pollution gunks it up), and even the keenness of the observer's eyesight.

The young Moon becomes visible to the unaided eye much earlier at times when the ecliptic is perpendicular to the horizon, and the Moon pops straight up into the sky. In these cases, it may be possible to see the Moon as little as 24 hours after it was new, although every hour beyond that greatly increases the chances of spotting it. When the ecliptic is at a low angle to the horizon, and the Moon moves almost parallel to the horizon as it rises, the Moon probably doesn't become visible until at least 36 hours past new.

The record for the earliest claimed sighting of the young crescent Moon is around 19 hours, although most experts are suspicious of any claims of times less than about 24 hours.

Explanation:

Answer:

133.85 K

Explanation:

Initial pressure, P₁ = 635 torr

Initial temperature, T₁ = 67.0°C = 340 K

Final pressure, P₂ = 250 torr

We need to find the new temperature. The relation between temperature and pressure is given by :

\(\dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}\\\\T_2=\dfrac{P_2T_1}{P_1}\\\\T_2=\dfrac{250\times 340}{635}\\\\T_2=133.85\ K\)

So, the new temperature is equal to 133.85 K.

When approaching radioactive decay problems, the first thing you must do is to identify the type of decay occurring, which can be alpha decay, beta decay, or gamma decay.

Once you have identified the type of decay, you can then use the appropriate decay equation to calculate the decay rate or half-life of the radioactive material. It is important to note that radioactive decay problems often involve exponential functions, so understanding how to solve exponential equations is also crucial in solving these types of problems. The weak nuclear force is the fundamental force responsible for the radioactive decay of particles.

A nucleus undergoing radioactive decay means that this nucleus is relatively large and contains many neutrons leading to instability in the naturally occurring state.

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Amino acids are linked together by covalent bonds to make the polymer called as proteins.

What is a protein?

Proteins are organic compounds composed of amino acids arranged in a linear sequence and held together by peptide bonds between adjacent amino acids, which are commonly referred to as polypeptide chains.

Some proteins are composed of a single polypeptide chain, while others are composed of numerous polypeptide chains that have been combined.

A protein is a chain of amino acids linked together by peptide bonds.

There are 20 different amino acids that can be combined to form a protein chain, each with its unique side chain or "R" group.

The "R" group's chemistry determines the amino acid's chemical characteristics, including whether it is hydrophobic or hydrophilic.

The chain of amino acids that forms the protein can fold up on itself in various ways, resulting in a

three-dimensional structure that determines the protein's function.

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pH of solution A is 12.5 and it is the most basic (alkaline) among all.

Those solution which are having value more than 7 in the pH scale shows the basic character and relation between pH & pOH will be represented as:

pH + pOH = 14

Now we calculate the pH for given solutions:

For solution A, pOH = 1.5

pH = 14 - 1.5 = 12.5

For solution B, pOH = 7

pH = 14 - 7 = 7

For solution C, pOH = 13.5

pH = 14 - 13.5 = 0.5

Value of pH for solution A is highest and shows basic nature, solution B is neutral and solution C is acidic in nature.

Hence, solution A is most basic.

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Answer:

When water dissolves a substance, the water molecules attract and “bond” to the particles (molecules or ions) of the substance causing the particles to separate from each other. The “bond” that a water molecule makes is not a covalent or ionic bond. It is a strong attraction caused by water’s polarity.

Explanation:

\(\\ \sf\longrightarrow Molarity=\dfrac{Moles\:of\:solute}{Volume\:of\: solution\:in\:L}\)

\(\\ \sf\longrightarrow Molarity=\dfrac{0.65}{0.05}\)

\(\\ \sf\longrightarrow Molarity=0.13M\)