In a classroom demonstration, hydrogen gas and oxygen gas are mixed in a balloon. The mixture is stable under normal conditions, but if a spark is applied to it or some powdered metal is added, the mixture explodes. (a) Is the spark acting as a catalyst? Explain.

Answer: There are 3.99 .

Explanation:

4.01 x 1012 grammes of beryllium contain 4.45 x 1011 moles of beryllium. The chemical element beryllium has the atomic number 4 and the letter Be assigned to it. Alkaline earth metal is brittle, steel-gray, strong, and light.

The formula: can be used to determine how many moles of a material there are.

Molar mass divided by mass equals a mole.

Beryllium has a molar mass of 9.012 g/mol.

Therefore, we can perform the following calculation to determine how many moles of beryllium there are in 4.01 x 1012 grammes of beryllium:

4.01 x 10-12 grammes are equal to 9.012 grammes per mole.

4.45 x 1011 moles are one mole.

Therefore, 4.01 x 1012 grammes of eryllium contain 4.45 x 1011 moles of eryllium.

Note that both numbers must have the same exponent when writing in scientific notation, and that you must use a calculator to perform the calculation if you don't want to receive the wrong answer.

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The concentration of the Nitric acid solution : 0.114 M

Titration is a procedure for determining the concentration of a solution (analyte) by reacting with another solution whose known concentration (usually a standard solution) is called the titrant. Determination of the endpoint/equivalence point of the reaction can use indicators according to the appropriate pH range  

Titrations can be acid-base titration, depositional titration, and redox titration. An acid-base titration is the principle of neutralization of acids and bases  

Reaction

HNO₃ + NaOH → NaNO₃ + H₂O​

Concentration a standard solution  of sodium hydroxide :  0.0998 mol/dm³ , and the volume = 25 cm³

moles NaOH=

\(\tt mol=M\times V\\\\mol=0.0998\times 25\\\\mol=2.495~mlmoles\)

From the equation, mol ratio HNO₃ : NaOH = 1 : 1, so mol HNO₃ = mol NaOH=2.495 mlmoles

The volume of HNO₃ = 21.8 cm³, so the concentration :

\(\tt M=\dfrac{n}{V}\\\\M=\dfrac{2.495}{21.8}\\\\M=0.114\)

The concentration of the nitric acid solution is 0.11445 mol/dm³

From the question,

We are to calculate the concentration of the nitric acid solution

The given balanced chemical equation for the reaction is

HNO₃ + NaOH → NaNO₃ + H₂O​

This means 1 mole of HNO₃ is needed to completely neutralize 1 mole of NaOH

Using the formula

\(\frac{C_{A}V_{A} }{C_{B}V_{B}} = \frac{n_{A}}{n_{B}}\)

Where \(C_{A}\) is the concentration of acid

\(C_{B}\) is the concentration of base

\(V_{A}\) is the volume of acid

\(V_{B}\) is the volume of base

\(n_{A}\) is the mole ratio of acid

\(n_{B}\) is the mole ratio of base

From the given information

\(C_{B}= 0.0998\ mol/dm^{3}\)

\(V_{A} = 21.80 \ cm^{3}\)

\(V_{B} = 25.0 \ cm^{3}\)

From the balanced chemical equation

\(n_{A} = 1\)

\(n_{B} =1\)

Putting the parameters into the formula, we get

\(\frac{C_{A} \times 21.80 }{0.0998 \times 25.0} = \frac{1}{1}\)

Then,

\(C_{A} \times 21.80=0.0998 \times 25.0\)

∴ \(C_{A}=\frac{0.0998 \times 25.0}{21.80}\)

\(C_{A} =\frac{2.495}{21.80}\)

\(C_{A} = 0.11445 \ mol/dm^{3}\)

Hence, the concentration of the nitric acid solution is 0.11445 mol/dm³

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Answer:

Waves carry energy from one place to another.

Because waves carry energy,some waves are used for communication,eg radio and television waves and mobile telephone signals.

Explanation:

i hope it helps

that's my answer

correct me if im wrong

Answer: A fossil will usually have remains or impressions of an animal or plant.

Answer:

the answer is b

Explanation:

trust me

Answer:

Matter or energy can change from one form to the other

Explanation:

The law of conservation of energy states that energy can neither be created nor destroyed but can only be transformed i.e. changed from one form to another. For example, mechanical energy can be changed to electrical energy.

Likewise, the law of conservation of mass/matter states that matter can not be destroyed or created but can change via physical or chemical means to conserve it. For example, matter can change from liquid state to gaseous state.

From the above two laws, it can be said that "matter or energy can change from one form to the other".

Answer: orbitals supernumerary

Explanation:

Answer:

both S orbital and p orbitals

Explanation:

took the exam got the question right.

The graduated cylinder is used to measure the volume of KOH and H2SO4 when accurate volume measurement is not required.

In the laboratory certain graduated apparatus are used to measure liquids. These graduated apparatus used to measure liquids include;

Sometimes, we are not really looking for a strictly accurate volume of liquid and we can use a graduated cylinder to measure the volume of liquid in such cases.

However, when we need to have strictly accurate volume measurement, we need a pipet or a buret.

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Answer:

Explanation:

Neils Bohr in 1913 put forward his own model of the atoms based on the quantum mechanics originally developed by Planck.

Answer:

It showed that electrons could jump from one path to another

Explanation:

quiz

If the heat capacity of the bomb calorimeter is 9.96 kj/°c, then the amount of heat released from combustion of 2 g of wood is 39.84 kJ.

To determine the amount of heat released from combustion of 2 g of wood, you need to use the formula

Q = C × ΔT Where:Q is the heat released or absorbed in joules (J)C is the heat capacity of the bomb calorimeter (given as 9.96 kJ/°C)ΔT is the change in temperature in degrees Celsius (°C)We can assume that all the heat released from the combustion of the wood is absorbed by the calorimeter, so we can use the heat capacity of the calorimeter to calculate the heat released. Since the calorimeter absorbs the heat, the value of Q will be negative (i.e. the heat is released).

Given: Mass of wood = 2 g Heat capacity of the bomb calorimeter = 9.96 kJ/°C First, we need to calculate the change in temperature. This can be done by measuring the temperature of the calorimeter before and after combustion. Let's assume that the temperature increases by 4.0 °C.ΔT = 4.0 °C Now, we can calculate the heat released: Q = C × ΔTQ = (9.96 kJ/°C) × (4.0 °C)Q = 39.84 kJ

Therefore, the amount of heat released from combustion of 2 g of wood is 39.84 kJ.

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Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

The correct answer is d. 4d, as it has a higher principal quantum number and azimuthal quantum number compared to the other options.

According to the Aufbau Principle, the sublevel that is filled last is the one with the highest principal quantum number (n) and the highest azimuthal quantum number (l) among the sublevels within the same energy level.

In the given options, the sublevel with the highest principal quantum number and azimuthal quantum number is 4d. The Aufbau Principle states that electrons fill orbitals in order of increasing energy, so the 4s, 4p, and 4d sublevels are filled in that order.

Therefore, the correct answer is d. 4d, as it has a higher principal quantum number and azimuthal quantum number compared to the other options.

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1.  the final concentration of NaOH after adding 125 mL of water to 45.3 mL of 0.71 M NaOH solution is approximately 0.189 M.

2.  the final concentration of KOH after adding 550 mL of water to 125 mL of 3.01 M KOH solution is approximately 0.557 M.

1.) If 125 mL of water is added to 45.3 mL of a 0.71 M NaOH solution, the resulting solution will be a diluted NaOH solution. The addition of water will increase the total volume while reducing the concentration of NaOH. To determine the final concentration of NaOH, we need to consider the conservation of moles.

First, let's calculate the moles of NaOH in the initial solution:

moles of NaOH = volume (in L) × concentration (in M)

moles of NaOH = 0.0453 L × 0.71 M = 0.0321433 moles

After adding 125 mL (0.125 L) of water, the total volume of the solution becomes 0.0453 L + 0.125 L = 0.1703 L.

To find the final concentration, we divide the moles of NaOH by the total volume:

final concentration of NaOH = moles of NaOH / total volume

final concentration of NaOH = 0.0321433 moles / 0.1703 L ≈ 0.189 M

Therefore, the final concentration of NaOH after adding 125 mL of water to 45.3 mL of 0.71 M NaOH solution is approximately 0.189 M.

2.) If 550 mL of water is added to 125 mL of a 3.01 M KOH solution, the resulting solution will also be a diluted solution. Again, we will apply the conservation of moles to determine the final concentration of KOH.

First, calculate the moles of KOH in the initial solution:

moles of KOH = volume (in L) × concentration (in M)

moles of KOH = 0.125 L × 3.01 M = 0.37625 moles

After adding 550 mL (0.55 L) of water, the total volume of the solution becomes 0.125 L + 0.55 L = 0.675 L.

To find the final concentration, divide the moles of KOH by the total volume:

final concentration of KOH = moles of KOH / total volume

final concentration of KOH = 0.37625 moles / 0.675 L ≈ 0.557 M

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The antiseptic may affect the results of tests for bilirubin uric acid is Povidone-iodine.

Polyvinylpyrrolidone (povidone, PVP) and elemental iodine combine chemically to form the stable compound known as povidone-iodine. On a dry basis, it has a 9.0% to 12.0% available iodine content. H. A. Shelanski and M. V. Shelanski found this particular complex in 1955 at the Industrial Toxicology Laboratories in Philadelphia.

The compound was discovered to be less harmful to mice than tincture of iodine during in vitro tests to exhibit anti-bacterial efficacy. Clinical tests on humans revealed that the medication outperformed competing iodine formulations. Povidone-iodine was marketed right away and has since taken over as the most widely used iodine antiseptic.

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Povidone-iodine is an antiseptic that may affect the results of tests for bilirubin and uric acid. Povidone-iodine is a commonly used antiseptic that can be applied topically to the skin to reduce the risk of infection during medical procedures. However, it can also interfere with certain laboratory tests, including tests for bilirubin and uric acid.

Bilirubin is a yellow pigment that is produced when red blood cells break down, and it is excreted by the liver. Uric acid is a waste product that is produced when the body breaks down purines. Both bilirubin and uric acid can be measured through laboratory tests to help diagnose certain medical conditions.

However, povidone-iodine can interfere with these tests by reacting with the substances being tested, leading to inaccurate results. It is important for healthcare professionals to be aware of the potential for povidone-iodine to affect laboratory test results and take appropriate measures to minimize this risk, such as avoiding its use immediately prior to testing.

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Answer: D.)Topsoil

Explanation: Have agriculture

Answer:

las plantas

Explanation:

Las plantas son los seres vivos capaces de transformar energía luminosa utilizando agua y dióxido de carbono (CO₂) en energía química en forma de moléculas llamadas carbohidratos. El proceso a través del cual realizan esto se denomina fotosíntesis, y para ello requieren un pigmento de color verde denominado clorofila, el cual es necesario para captar la energía luminosa proveniente del Sol.

Answer:

B Hydrogen Ions is answer

When red blood cells are placed in Solution A, which contains 150 mM NaCl, no significant changes occur because the concentration of sodium chloride is similar to that of the cells' internal environment. The isotonic nature of Solution A ensures that there is no net movement of water across the cell membrane, resulting in the cells maintaining their normal shape and size.

However, when comparing the tonicity of Solutions B, C, D, and E to Solution A and each other, differences arise. Tonicity refers to the osmotic pressure exerted by a solution on a cell and is influenced by the concentration of solutes within the solution. Solutions B and E both contain additional solutes along with NaCl.

Solution B, consisting of 100 mM glucose and 100 mM NaCl, has a higher tonicity compared to Solution A. Glucose cannot freely cross the cell membrane, creating an osmotic gradient that draws water into the red blood cells, causing them to swell.

Solution C contains 100 mM Drug X, a small non-polar molecule, along with 150 mM NaCl. Since Drug X is non-polar, it can freely cross the cell membrane. The presence of Drug X does not significantly affect the tonicity compared to Solution A, as it does not create an osmotic gradient.

In contrast, Solution D, which contains 150 mM MgCl2, has a higher tonicity than Solution A. MgCl2 dissociates into Mg2+ and Cl- ions, both of which cannot cross the cell membrane easily. The higher concentration of impermeable ions creates an osmotic gradient, leading to water loss from the red blood cells and causing them to shrink.

Lastly, Solution E consisting of 300 mM fructose has a higher tonicity compared to Solution A. Fructose cannot freely cross the cell membrane, resulting in an osmotic gradient that draws water into the red blood cells, causing them to swell.

In summary, placing red blood cells in Solution A does not produce significant changes in the cells. However, when comparing the tonicity of Solutions B, C, D, and E to Solution A and each other, variations in osmotic pressure occur due to the presence of different solutes.

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The observed optical rotation of the solution is 0.300 degrees.

When a solution of D-lactose is exposed to plane-polarized light, it exhibits optical rotation. The observed optical rotation is a measure of the degree of rotation of the plane of polarized light as it passes through the solution. In this case, the observed optical rotation is 0.300 degrees.

To determine the observed optical rotation of a solution, we need to know the specific rotation of the compound in question. The specific rotation is a characteristic property of a substance and is typically reported in units of degrees per decimeter per gram (°/dm/g). Unfortunately, you haven't provided the specific rotation value for D-lactose.

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Answer:

A) Test(independent) variable is bat wings.

B) Result (dependent) Variable is the Polyjuice Potion.

C) Cauldrons and fire

Explanation:

A) A test/independent variable is the variable that is being tested in the experiment or research and it is not affected by other variables in the experiment.

Now, in this experiment, what is being tested is are the bat wings.. Thus;

Test(independent) variable is bat wings.

B) Result (dependent) Variable is a variable that depends on the independent variable being tested. From the question, the result is the Polyjuice Potion.

Thus, Result (dependent) Variable is the Polyjuice Potion.

C) The constants are things that don't change with respect to any of the other variables. In this case, they are; cauldrons and fire

Using the given mass of the compound (0.520 g) and the calculated moles, we can determine the molar mass of the compound.

To find the molar mass of the compound, we can use the formula:

ΔT = Kf * m

where ΔT is the freezing point depression, Kf is the cryoscopic constant (in this case, 3.90 °C/m), and m is the molality of the solution.

First, we need to calculate the molality (m) of the solution:

m = moles of solute / mass of solvent (in kg)

The mass of the solvent (lauric acid) is given as 4.62 g. Since the unknown compound is a solute, we need to convert its mass to moles:

moles = mass / molar mass

Given that the mass of the unknown compound is 0.520 g, we can now calculate the moles of the compound.

Next, we convert the mass of the solvent to kg by dividing by 1000:

mass of solvent (lauric acid) = 4.62 g / 1000 = 0.00462 kg

Now we can calculate the molality:

m = moles of solute / mass of solvent = (moles of the compound) / (mass of solvent)

Finally, we can use the freezing point depression formula to find the molar mass of the compound:

ΔT = Kf * m

Substituting the given values:

4.20 °C = 3.90 °C/m * m

Now solve for m:

m = (4.20 °C) / (3.90 °C/m)

Once we have the molality, we can calculate the moles of the compound:

moles = molality * mass of solvent (in kg)

Finally, we calculate the molar mass:

molar mass = mass of solute / moles of solute

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Answer:

A

Explanation:

because they are also rare gases and all both belong to the same group eight

Answer:

Pentane

Explanation:

Answer:

Explanation:

To show the reactants and products, write the imbalanced equation.

Calculate the number of atoms of each element on each side of the reaction arrow.

To make the number of atoms of each element the same on both sides of the equation, multiply coefficients (the numbers in front of the formulas). ...

Check your work by indicating the state of matter of the reactants and products.

In the process of hydrogenating fat, the carbon atoms in the molecule are added.

what is fat hydrogenation?

In order to transform some or all of the unsaturated fat into saturated fat and create a solid or semi-solid fat, fat is normally liquid vegetable oils that are combined with hydrogen.

Vegetable oil is hydrogenated by heating a mixture of vegetable oil and a metal catalyst—typically nickel—in a near-vacuum environment to extremely high temperatures and then adding hydrogen. The oil's carbon atoms lose their double bonds with other carbons as a result. The double bond between carbon atoms can no longer exist since each carbon atom is single-bonded to a distinct hydrogen atom.

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Answer:

Polymerisation is the chemical process of monomers joining together to form polymers, often it takes many thousands of monomers to make a single polymer.

Explanation:

Answer:

One type of cleaner that is highly effective for removing mineral deposits is an acid-based cleaner.

Explanation:

Mineral deposits, such as limescale, rust, or hard water stains, can be stubborn and difficult to remove. Acid-based cleaners are specifically formulated to dissolve and break down these mineral deposits. The acidic properties of these cleaners work by reacting with the minerals, causing them to loosen and dissolve, making it easier to remove them from various surfaces.

Two commonly used acid-based cleaners for removing mineral deposits are vinegar and lemon juice. Vinegar, which contains acetic acid, can be applied directly or used as a soak to effectively remove mineral deposits on surfaces.

A mineral deposit refers to the accumulation or concentration of minerals in a specific location or geological formation. It occurs through natural processes over extended periods of time. Mineral deposits can be found in various forms, such as solid masses, veins, or scattered grains within rocks or sediments.

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One type of cleaner that is highly effective for removing mineral deposits is an acid-based cleaner. Mineral deposits, such as those caused by hard water or limescale, are often composed of calcium, magnesium, and other minerals that can be dissolved by acidic substances.

Acid-based cleaners work by reacting with the mineral deposits, breaking them down and dissolving them. Common examples of acid-based cleaners include vinegar (acetic acid), lemon juice (citric acid), and commercial descaling products that contain stronger acids like hydrochloric acid or phosphoric acid. The acidic nature of these cleaners allows them to effectively remove mineral deposits from various surfaces, such as sinks, faucets, showerheads, and toilet bowls. The acids react with the minerals, causing them to dissolve and be easily wiped or rinsed away. However, it's important to exercise caution when using acid-based cleaners as they can be corrosive to certain materials, such as marble or some types of metal. It's recommended to follow the manufacturer's instructions and test the cleaner on a small, inconspicuous area before applying it to the entire surface.

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Answer: The economic demands of Plan B were too high.

Explanation: During the selection of any action plan to maintain biodiversity, several factors must be considered. These factors include the cost of the plan, the estimated effectiveness of the plan at protecting the targeted populations, and how the plan will affect both humans and other populations in the area.

The chart shows that the approximate cost of implementing Plan A was $5 billion. The approximate cost of implementing Plan B was $30 billion. While Plan B might have been more effective at reducing habitat destruction, and thus maintaining biodiversity, state officials likely chose Plan A over Plan B because the economic demands of Plan B were too high.

Answer: The economic demands of Plan B were too high.

Explanation:

just did it

Answer:

CuSO4

because copper formula is Cu

formula of sulfur is S and Oxygen O