acid strong or weak? species present at 10-6 mol/l or greater when dissolved in water strong weak strong weak

Wavelength (L) is calculated using: L = gT²/2π, here g=9.8 m/s2 and T is wave period in seconds.

Wavelength of a wave describes how long the wave is and the distance from the "crest" (top) of one wave to the crest of next wave is called wavelength. We can also measure from the "trough" (bottom) of one wave to trough of next wave and get the same value for the wavelength.

We measure wavelength in following ways:

Use photometer to measure the energy of wave.

Convert energy into joules (J).

Divide energy by Planck's constant, 6.626 x 10⁻³⁴, to get the frequency of  wave.

Divide speed of light, ~300,000,000 m/s, by frequency to get wavelength.

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Answer:

Liquid water is held together by hydrogen bonds. Oils and fats not have any polar part and so for them to dissolve in water they would have to break some of water s hydrogen bonds.Water will not do this so the oil is forced to stay separate from the water.

Oil are the lipid molecule do not Mix With Water Because of Polarity. Oil and water don’t mix as it  is made up of non-polar molecules while water molecules are polar.

Lipids are organic biomolecule made up of carbon, hydrogen and oxygen with some other elements like phosphorus and nitrogen may be present.

A fatty acid which is an organic acid having hydrogen and general formula R-COOH where R represents hydrogen or a group of carbon and hydrogen atoms, for example stearic, palmitic and oleic acids.

Glycerol is another component which is a thick sweetish liquid, soluble in water and  can react with a fatty acid. where one molecule of glycerol combines with three molecule is fatty acids by formation of a bond called ester, here ester is also known as triglyceride.

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Answer: C

Explanation: Because I just did the test lol.

Chemicals are substances that can be natural or man-made. It can both hurt and help the environment as they pollute water and can also clean water. Thus, option C is correct.

Chemicals are compounds that are synthesized artificially and have various uses and applications in various fields. They can be both beneficial and detrimental to the environment and the ecosystem.

Chemicals like that from factories, pesticides run-off from agricultural fields, drugs, microorganisms, fertilizers, radioactive substances, etc, cause water pollution by acting as contaminants.

On the contrary, chemicals can be used to clean water pollution. Chloramine and chlorine are the most common chemical disinfectants that cleanse contaminated water to make it useful.

Therefore, option C. chemicals can both clean and pollute water.

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Independent Variable IV is atmospheric temperature, Dependent Variable (DV) are 70°,80°, and 90° , Control Group are  researchers and Constants are humidity and temperature.

Atmospheric temperature is a measurement of temperature at different and various levels of the Earth's atmosphere and above it.

It is effected by many factors, including incoming solar rays, and the humidity and how far from the sea level.

Therefore, Independent Variable IV is atmospheric temperature, Dependent Variable (DV) are 70°,80°, and 90° , Control Group are  researchers and Constants are humidity and temperature.

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Answer:

Using the combined gas law:

(P1 x V1) / T1 = (P2 x V2) / T2

where:

P1 = 34.5 psi (initial pressure)

V1 = 32.2 L (initial volume)

T1 = 27°C + 273.15 = 300.15 K (initial temperature in Kelvin)

V2 = 31.04 L (final volume)

T2 = 43°C + 273.15 = 316.15 K (final temperature in Kelvin)

Solving for P2:

(P1 x V1 x T2) / (V2 x T1) = P2

(34.5 psi x 32.2 L x 316.15 K) / (31.04 L x 300.15 K) = P2

P2 = 37.2 psi

Therefore, the new pressure in the tire is 37.2 psi when the temperature increases to 43°C and the volume decreases to 31.04 L.

Answer:

-8.89

Explanation:

The deceleration of the body would be 8.889 m/s2

It is also called negative acceleration. There are two types of acceleration instantaneous acceleration and average acceleration. Average acceleration is the ratio of change in velocity to total time interval.

acceleration = velocity/ time

In given question,

Acceleration= rate of change of velocity/ time

                     = 85 – 45/ 4.5

                     = 40/ 4.5

                     = 8.889 m/s2

Therefore, The deceleration of the body would be 8.889 m/s2

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The volume of 0.250 M sulfuric acid necessary to react completely with 66.0 g sodium hydroxide is 0.132 L

The reaction of sulphuric acid and sodium hydroxide is expressed as:

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O

Determine the moles of NaOH present:

Molar mass of NaOH = 23 + 16 + 1 = 40g/mole

Given that mass of NaOH is 66.0g

Mole of NaOH = 66/40  = 1.65moles

Determine the number of moles  needed to react with 1.65 moles NaOH:

Moles of H₂SO₄ = 1.65/2 = 0.825 moles

Recall that volume = Molar mass * number of moles

Volume of H₂SO₄ =  0.160 * 0.825

Volume of H₂SO₄  = 0.132L

Hence the volume of 0.250 M sulfuric acid necessary to react completely with 66.0 g sodium hydroxide is 0.132 L

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When gases in two different containers are same , at same temperature, and same pressure then the number of moles must also be same.

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Answer:

100 grams of C-14 decays to 25 grams in 11,460 years.

The C-14 isotope is only useful for dating fossils up to about 50,000 years old

If an ancient bone contains 6.25% of its original carbon, then the bone must be 22,920 years old.

Explanation:

We already know that the half life of C-14 is 5,730 years. After the first half life, we have 50 grams remaining. This takes 5,730 years. After the second half life (11,460 years now gone) we have 25 grams of C-14  left.

If a fossil material is  older than 50,000 years an undetectable amount of 14C is left in the sample hence Carbon-14 is no longer suitable for dating the sample.

From;

0.693/5730 = 2.303/t log (No/0.0625No)

Where;

t = time taken and No = initial amount of C-14

0.693/5730= 2.77/t

t = 22,920 years

The three state of matter are solid, liquid and gas.  Water exists in all these states as ice, liquid water, water vapor respectively. The level of energy will varies from each state where, gaseous particles possess highest energy.

Every substances are able to exhibit  three states of matter namely gas, liquid and solid. However, some are more stable in any one state more probably by origin.

Substances in solid state have molecules closely packed without a space to move apart each other. Hence, the energy of molecules in solid state is very low.

In liquid state, molecules have some space to move apart and thus they can flow and have no definite shape like solids.  Whereas in gases, molecules are far apart and they are free enough to move and thus have highest energy.

Therefore, water molecules in its vapor state is having highest energy than its liquid state and ice.

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1.  We can see here that energy is required to change the phase of matter. For example, energy is required to melt ice, vaporize water, and condense steam. The amount of energy required to change the phase of matter is called the latent heat.

Energy is a fundamental concept in physics and refers to the ability or capacity of a system to do work or produce a change.

2. The demonstration on the sample of water showed that water can exist in three phases: solid, liquid, and gas. The solid phase is ice, the liquid phase is water, and the gas phase is steam.

The demonstration started with ice at 0°C. As heat was added to the ice, the temperature of the ice increased. However, the ice did not melt until the temperature reached 0°C. This is because the energy from the heat was used to break the bonds between the water molecules in the ice. Once the bonds were broken, the ice melted and became water.

3. Completing the

Page 4:

Heating and cooling curves are graphical representations of how temperature changes during the process of heating or cooling a substance. They illustrate the relationship between temperature and the state of matter.

Both curves show:

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The type of irony used in "reckless endangerment of human life" is verbal irony. Verbal irony is a figure of speech in which words are used to mean something different from their literal meaning.

In this instance, the phrase "reckless endangerment of human life" refers to behavior that puts people's lives in danger. However, it is ironic because it is a criminal offense that should be avoided and yet it is taking place. Verbal irony is often used for humorous or dramatic effect. This type of irony is used to create a contrast between what is said and what is meant. In this case, the phrase "reckless endangerment of human life" is used to describe behavior that is extremely dangerous, yet it is ironic because it is the opposite of what should be happening.

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Explanation:

Isolated systolic hypertension happens when the diastolic blood pressure is less than 80 millimeters of mercury (mm Hg) and the systolic blood pressure is 130 mm Hg or higher. Isolated systolic hypertension is the most common form of high blood pressure in people older than age 65.

hope it helps you please mark me brain list

High systolic blood pressure and low diastolic blood pressure are indicative of a condition called isolated systolic hypertension (ISH).

Under this condition, the systolic pressure is consistently elevated (above 130mm Hg) while the diastolic pressure remains below (80mm Hg). Older adults are more prone to this condition since it is often related to the aging process and changes in blood vessel elasticity.

ISH can increase the risk of heart disease, stroke, and other cardiovascular complications, thus it requires immediate medical attention.

Some treatments for this condition include lifestyle modifications such as regular exercise, a healthy and balanced diet, weight management, and smoking cessation. However, in some cases, prescribed medication may be used to help lower blood pressure.

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Answer: lol

Explanation: ok 11 plus 1 is 12

The murder took place approximately 851.2 years ago.

Based on the isotope's half-life, we must determine the age of the remains.

90% of the normal amount being present in the remains means that 0.90 of the isotope is still present.

The equation for radioactive decay can be used:

fraction remaining =\((1/2)^(^n^/^t^)\)

Where

We can rearrange the formula to solve for the number of half-lives (n):

n = (log base 0.5) (fraction remaining)

Using the given fraction remaining of 0.90:

n = (log base 0.5) (0.90)

n ≈ 0.152

Since the number of half-lives is a fraction, we can convert it to years by multiplying it by the half-life:

time elapsed = n * t

time elapsed ≈ 0.152 * 5600 years

time elapsed ≈ 851.2 years

So, the murder took place approximately 851.2 years ago.

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Answer:

The correct answer is D!

Explanation:

Liquids have a fixed shape and fixed volume. Liquids take the shape of their containers. Hope you have a great dayy!

What is Stoichiometry?

Stoichiometry is the relationship between two substances through use of ratios.

To answer these questions, you must use the ratio:

1 mol of a substance      

6.022 × 10²³ molecules

Let's try the first question:

9.25 × 10³⁴ molecules H₂O     ×         1 mol H₂O        

                                                 6.022 × 10²³ molecules

The molecules will cancel out, leaving you with

9.25 × 10³⁴ mol

6.022 × 10²³ mol

Use your calculator to solve:  1.536 × 10¹¹ mol H₂O

Now, follow this same format to solve the rest of the questions:

2) 4.51 × 10¹⁵ molecules Al      ×       1 mol Al      

                                                 6.022 × 10²³ molecules

= 4.51 × 10¹⁵ mol Al

6.022 × 10²³ mol Al

= 7.489 × 10⁻⁹ mol Al

3) 3.78 × 10²⁰ molecules Li    ×         1 mol Li        

                                                 6.022 × 10²³ molecules

0.0006276 mol Li

_________________________________________________________

The initial pH of pure water is 7.0, and after adding 0.028 mol of NaOH to 280.0 ml of water, the final pH is approximately 13.0 due to an increase in hydroxide ion concentration.

The initial pH of pure water is 7.0, as it is considered neutral. After adding 0.028 mol of NaOH to 280.0 ml of pure water, the final pH can be calculated.

Pure water has a neutral pH of 7.0, which means it has an equal concentration of hydrogen ions (H+) and hydroxide ions (OH-). When NaOH is added to water, it dissociates into Na+ and OH- ions. The OH- ions react with the H+ ions in the water, resulting in an increase in the concentration of hydroxide ions and a decrease in the concentration of hydrogen ions.

To calculate the final pH, we need to determine the concentration of OH- ions after the addition of NaOH. Since 0.028 mol of NaOH is added to 280.0 ml of water, the concentration of OH- ions can be calculated using the molarity formula:

Molarity = Moles of solute / Volume of solution (in liters)

Converting the volume of water to liters (280.0 ml = 0.280 L), we can calculate the molarity of the OH- ions:

Molarity of OH- = (0.028 mol) / (0.280 L) = 0.10 M

The concentration of OH- ions corresponds to the pOH value, which is the negative logarithm (base 10) of the hydroxide ion concentration:

pOH = -log [OH-] = -log (0.10) ≈ 1.0

Since pH + pOH = 14 (for neutral solutions), the final pH can be calculated:

pH = 14 - pOH = 14 - 1.0 = 13.0

Therefore, the final pH after adding 0.028 mol of NaOH to 280.0 ml of pure water is approximately 13.0.

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Answer:

Explanation:

1 is true

2 is false

3 is true

4 is true

5 is false

That is what I got from researching.

Only about 3% of the water in the Earth is fresh water and about 75 % of the fresh water on Earth is frozen in ice sheets.  

• The most vital element present on the Earth is water. All the living beings are dependent on it.  

• Water is present in the majority of the Earth, however, of this only 3% of the water is freshwater, the rest is saline and undrinkable.  

• Of this 3%, the 75 percent of the freshwater is present in the form of ice and glaciers in the polar region.  

• The remaining 24 percent is the groundwater and the rest 1 percent includes the waters of rivers, lakes, and ponds.  

• The prime source of usable freshwater is present in the trapped form in the ice and glaciers.  

Thus, the correct statements are 1st and 3rd.

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In 1.2 x \(10^{24}\) formula units of \(Li_{2} (SO)_{4}\), there are roughly 1.993 moles of

\(Li_{2} (SO)_{4}\).

Using Avogadro's number, or 6.022 x \(10^{23}\) molecules/mol, we can calculate the number of moles of Li2SO4 in 1.2 x \(10^{24}\)formula units.

First, we need to figure out how many moles of \(Li_{2} (SO)_{4}\)  are needed to equal 1.2 x \(10^{24}\)  formula units:

Formula units equal 6.022 x \(10^{23}\) per mole of \(Li_{2}(SO)_{4}\).

As a result, there are: 1.2 x \(10^{24}\) moles of \(Li_{2}(SO)_{4}\) in the formula units.

1.993 moles are equal to 1.2 x \(10^{24}\) formula units / 6.022 x \(10^{23}\) formula units/mol.

Hence, 1.2 × \(10^{24}\) formula units of \(Li_{2} (SO)_{4}\) contain about 1.993 moles.

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This statement is false.

Secondary structures in proteins, such as alpha helices and beta sheets, are maintained by hydrogen bonding between backbone atoms, not side groups.

The backbone atoms include the carbonyl group (-C=O) and the amide group (-NH-) of the peptide bond, which link the amino acid residues together.

These hydrogen bonds occur between the electronegative oxygen atom of the carbonyl group and the hydrogen atom of the amide group, creating a regular repeating pattern of hydrogen bonding that stabilizes the secondary structure.

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The protons and neutrons that make up the atom's nucleus account for the majority of the atom's mass according to the Bohr model.

The Bohr model, also known as the Rutherford-Bohr model, was first proposed by Niels Bohr and Ernest Rutherford in 1913. It is a system made up of an orbiting nucleus that is compact and dense, surrounded by electrons, much like the Solar System.

Bohr was the first to realise that electrons move in various orbits around the nucleus and that the quantity of electrons in an element's outer orbit determines its properties.

In the Bohr model of the atom, the protons and neutrons that make up the nucleus are responsible for most of the atom's mass. The negatively charged electrons orbit the positively charged core, making up a small portion of the mass but being electrically comparable to the protons in the nucleus.

Therefore, the correct answer is option a. in specific, allowed orbits.

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The final volume of the unknown gas is 787.5 ml

Given:

volume of unknown gas = 450.0 mL

initial pressure of unknown gas = 0.07 atm

final pressure of unknown gas = 0.04 atm

To Find:

final volume of the unknown gas

Solution:

Substituting these values into Boyle’s law, we get

P1V1 = P2V2

(0.07)(450) = (0.04)V2

V2 = (0.07)(450)/(0.04)

V2 = 787.5

So, final volume of the unknown gas is 787.5 ml

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The root-mean-square speed of the molecules will be the highest in SF6 at 200°C. According to the kinetic-molecular theory, the root-mean-square speed of gas molecules is directly proportional to the square root of their absolute temperature and inversely proportional to the square root of their molar mass.

The formula for calculating the root-mean-square speed is:

vrms = √(3RT/M)

where:

vrms = root-mean-square speed

R = ideal gas constant

T = absolute temperature

M = molar mass of the gas

At a given temperature, gases with lower molar masses will have higher root-mean-square speeds. In this case, we are comparing gases at 200°C. Among the given options (O2, H2O, and SF6), SF6 has the highest molar mass. Therefore, according to the kinetic-molecular theory, the root-mean-square speed of SF6 molecules will be the highest at 200°C.

The root-mean-square speed of molecules is not the same for all gases at a given temperature. It depends on the molar mass of the gas. In this case, SF6 has the highest molar mass among the given options, so its molecules will have the highest root-mean-square speed at 200°C.

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this is just 60 divided by 15, which is 4

so your answer is 4A :)

Answer:

60 divided by 15? That's 4 if that's what you're asking

Chrysoberyl is Faceted to produce "cyclic twins" which is the correct option E.

Chrysoberyl is a beryllium aluminate mineral or gemstone with the chemical formula BeAl₂O₄. Chrysoberyl and beryl are two very distinct gemstones, despite the fact that their names are similar and they both contain beryllium. On the Mohs scale of mineral hardness, chrysoberyl, which ranks between corundum and topaz at 8.5, is the third-hardest naturally occurring gemstone that is often found.

Pegmatitic mechanisms result in the formation of chrysoberyl. Relatively low-density molten lava is created during melting in the Earth's crust and has the ability to ascend higher and reach the surface. Because water could not be integrated into the crystallisation of solid minerals, it grew increasingly concentrated in the molten rock as the primary magma body cooled.

As a result, the remaining magma is more abundant in water and uncommon elements that also do not fit into the crystal structures of the main minerals that form rocks. By lowering the temperature range before the magma solidifies fully, water allows the concentration of rare elements to advance to the point where they can create their own unique minerals.

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Complete question:

Chrysoberyl is

A light green-yellow form of Beryl

very common throughout the world

only formed in beryllium-poor environments

the 3rd hardest natural gemstone

Faceted to produce "cyclic twins"

Answer:D. Compound.

Explanation:

A compound is defined as a pure substance: formed when two or more elements chemically combine to form bonds between their atoms.

Answer:

National Pride Projects are a set of infrastructure projects by the government of Nepal based on the proposal by the National Planning Commission.

Answer:

This is because Corn is grown on land and has important values to man .These values include as a source of food for man and animals. It is also used as raw materials for the production of certain goods such as flour etc.

It is an energy resource because fermentation of corn gives rise to ethanol fuel which is used as a source of power to run machines and other equipment.