PLZ HELPS ME! WILL GIVE BRAINLIEST!!!!

1. In the mathematical equation for transverse waves, the symbol neu represents ts the _________.
A. Energy
B. Frequency
C. Speed of sound
D. Wavelength

2. What is the frequency of a 6.43 x 10^-5 m wave?
A. 4.66 x 10 ^ 12 hz
B. 5.5 x 10 ^ 7 hz
C. 1.03 x 10 ^ 4 hz
D. 1.2 10^15 hz

3. What is the wavelength of a 1.28 x 10^17 Hz wave?
A. 4.66 x 10 ^ 12 m
B. 8.1 x 10 ^4 m
C. 6.9 x 10^-8 m
D. 4.26 x 10^8 m

4. What is the wavelength of a wave having a frequency of 5.21 x 10^14 s-1?
A. 1.26 x 10^16 m
B. 7.1 x 10 ^ 7 m
C. 5.74 x 10^-7 m
D. 2.07 x 10 ^15 m

Answer:

Because the Earth's gravity acts on the atmosphere and holds it down, just as it does all other objects. The weight of the atmosphere is estimated to be about 5.75 quadrillion (5,750,000,000,000,000) tons. Air pressure is the "push" of the atmosphere on the Earth's surface.

The optimum temperature for sucrase activity is 37 °C. The hydrolysis of sucrose is slowest at 0 °C.

The optimum temperature for sucrase activity is 37 °C, which means that the enzyme functions most efficiently at this temperature. As the temperature deviates from the optimum, the enzyme activity decreases. Therefore, the hydrolysis of sucrose would be slowest at a temperature that is significantly lower or higher than 37 °C.

Among the given choices, the temperature that is significantly lower than 37 °C is 0 °C (choice e). Enzyme activity is typically greatly reduced or completely halted at very low temperatures, as the enzyme molecules become less active or may even denature. Therefore, the hydrolysis of sucrose would be slowest at 0 °C.

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Answer:

cd

Explanation:

that's better

Answer:

D: Fe + Cu(NO3)2 ->.

Worked for me on EG 2023

Emerging scientific ideas are new theories or ideas that are gaining attention in the scientific community, but have not yet been fully accepted or confirmed.

Emerging ideas refer to the new and innovative ideas or theories that have yet to gain full scientific acceptance. While a scientific consensus is a view or theory that has been universally accepted and confirmed by multiple experiments or research, an emerging scientific idea is a new and unproven theory or idea that is gaining attention in the scientific community. These emerging ideas may also be referred to as scientific hypotheses. In contrast to scientific consensus, emerging scientific ideas have not yet been subjected to rigorous testing and confirmation.

They are generally proposed to explain new observations or experimental results, which have not yet been fully understood or explained by established scientific theories. Emerging scientific ideas can have the potential to challenge the current scientific consensus. If an emerging scientific idea is found to be valid, it can ultimately lead to the establishment of a new scientific consensus. For example, the emerging scientific idea of the Higgs boson particle led to the discovery of a new field in particle physics, which is now an established scientific consensus.

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To make a 20.0 mL solution with a density of 1.10 g/mL, you would mix water with a liquid substance from the materials list that has a density greater than 1.10 g/mL.

To determine the liquid substance to mix with water, we need to find a substance with a higher density than 1.10 g/mL. Since water has a density of approximately 1 g/mL, we need to select a substance that will increase the overall density of the solution.

Let's consider a few examples of liquid substances that have higher densities:

Ethanol (density ≈ 0.789 g/mL): Mixing ethanol with water would not increase the density, as ethanol has a lower density than water.

Glycerol (density ≈ 1.26 g/mL): Mixing glycerol with water would increase the density of the solution. Glycerol has a higher density than water and would contribute to an overall higher density of the solution.

Chloroform (density ≈ 1.49 g/mL): Mixing chloroform with water would also increase the density of the solution. Chloroform has a higher density than water and would result in a solution with a higher overall density.

There are various other substances with higher densities that could be considered depending on the specific materials available.

To make a 20.0 mL solution with a density of 1.10 g/mL, you would need to mix water with a liquid substance from the materials list that has a density higher than 1.10 g/mL. Examples of substances that could be used are glycerol or chloroform, among others. It is important to select a substance with a higher density to increase the overall density of the solution.

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A molecule is nonpolar if it is symmetrical; that is, the electrons are distributed uniformly across the molecule. The polarity of a compound is determined by the electronegativity difference between its constituent atoms. When two atoms with significantly different electronegativities bond, they create a polar covalent bond.

A polar covalent bond is one in which electrons are not shared equally between the two atoms involved in the bond and, as a result, has a partial negative and a partial positive end. In a nonpolar covalent bond, however, the electrons are shared equally between the two atoms, and no partial charges are generated. Polar molecules are those that have an electronegativity difference between the constituent atoms, making them polar covalent molecules, whereas nonpolar molecules are those that lack a significant electronegativity difference between the atoms, resulting in nonpolar covalent molecules.

For example, O2, H2, and N2 are nonpolar because they contain identical atoms, whereas NH3, H2O, and CH3OH are polar because they have electronegativity differences between their constituent atoms.

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Answer:

Explanation:

have a good day

#1

#2

Yes here we can see the dots and crosses clearly.

#3

It's Methane or CH_4

#4

There is no double bond

Answer:

#1

See H and C have shared their electrons so its Covalent bonding

#2

Yes, here we can see the dots and crosses clearly.

Dot and crosses diagram

#3

It's Methane or CH_4

4 single bonds

#4

There is no double bond

Explanation:

mark the person that did it before me brainliest

The concentration of the chrome alum in the solution, in units of moles/liter (M), can be calculated using the formula:

Concentration (M) = moles of solute / volume of solution (in liters)

First, we need to calculate the moles of chrome alum in the solution. To do this, we divide the mass of chrome alum (327 grams) by its molar mass (499.41 g/mol):

Moles of chrome alum = mass of chrome alum / molar mass of chrome alum

Moles of chrome alum = 327 grams / 499.41 g/mol

Next, we need to convert the volume of the solution from milliliters to liters. There are 1000 milliliters in a liter, so:

Volume of solution (in liters) = 507 mL / 1000 mL/L

Finally, we can substitute the values into the concentration formula to calculate the concentration of chrome alum in the solution:

Concentration (M) = moles of chrome alum / volume of solution (in liters)

To find the concentration, we first calculate the moles of chrome alum by dividing the mass of chrome alum by its molar mass. Then, we convert the volume of the solution from milliliters to liters. Finally, we use the concentration formula to calculate the concentration of chrome alum in the solution.

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The mass of sodium present in 15.0 mL of blood drawn from the patient is 47.2 g.

\(15.0 \, \text{mL} = 15.0 \, \text{mL} / 1000 \, \text{mL/L} = 0.015 \, \text{L}\)

\(\text{Number of moles of sodium in 1 L} = \text{Molarity} \times \text{Volume of solution in L}\)

\(\text{Number of moles of sodium in 1 L} = 137 \, \text{mmol/L} \times 1 \, \text{L} = 137 \, \text{mmol}\)

\(\text{Number of moles of sodium in 0.015 L} = 137 \, \text{mmol/L} \times 0.015 \, \text{L} = 2.055 \, \text{mmol}\)

\(\text{Mass of sodium} = \text{Number of moles} \times \text{Molar mass}\)

\(\text{Mass of sodium} = 2.055 \, \text{mmol} \times 22.99 \, \text{g/mol} = 47.2 \, \text{g}\)

The mass of sodium present in the 15.0 mL of blood drawn from the patient is 47.2 g.

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Answer:

ionic

Explanation:

Answer:

the answer is ionic

Explanation:

hope this helps!

please can i also have brainliest too?

Answer:

ice cube melting

Explanation:

bcoz it's a chemical change

the wavelength of a single photon of UV-A electromagnetic radiation that possesses an energy of 6.2 x 10^-19 J is approximately 3.210 x 10^-5 cm. The option closest to this answer is 3.2 x 10^-5 cm.

explain about energy ?

The energy E of a photon is related to its wavelength λ by the following formula:

E = h * c / λ

where h is the Planck's constant, c is the speed of light in a vacuum, and λ is the wavelength of the photon.

We are given the energy of a single photon of UV-A electromagnetic radiation as 6.2 x 10^-19 J. The values of h and c are:

h = 6.626 x 10^-34 J s

c = 2.998 x 10^8 m/s (the speed of light in a vacuum)

To convert the wavelength to centimeters, we can use the conversion factor of 1 m = 100 cm.

Now we can rearrange the formula to solve for the wavelength λ:

λ = h * c / E

Substituting the given values, we get:

λ = (6.626 x 10^-34 J s) * (2.998 x 10^8 m/s) / (6.2 x 10^-19 J)

λ = 3.210 x 10^-7 m = 3.210 x 10^-5 cm (after conversion)

Therefore, the wavelength of a single photon of UV-A electromagnetic radiation that possesses an energy of 6.2 x 10^-19 J is approximately 3.210 x 10^-5 cm. The option closest to this answer is 3.2 x 10^-5 cm.

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The molarity of the KCl solution is 4.04 moles/ litre

Molarity (M), which is determined by dividing the solute's mass in moles by the volume of the solution in liters, is the most widely used unit to express solution concentration: liters of solution/moles of solute equals M. One liter of a solution with a 1.00 molar concentration (1.00 M) contains 1.00 moles of solute.

The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another name for molarity.

Molarity = no. of moles/ volume of solution

Volume of KCl solution given is 0.25 L

molarity = 1.01 / 0.25

molarity = 4.04 moles/ litre

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C.The concentration of hydrogen ions in a solution is the most correct explanation of what the pH scale actually measures that determines acidity and alkalinity of a solvent

Monitoring of the hydrogen ion activity in solutions is done with a pH metre. Potentiometry is the basis underlying pH metres' operation. This is how the electric potential of a solution is estimated (voltage). The hydrogen ion concentration in the solution is evaluated by pH. A solution with more H+ ions will always be acidic, while a solution with more OH- ions will constantly be alkaline. The pH range for solutions is 1 to 14. A solution with a pH of 1 will be strongly acidic, whereas one with a pH of 14 will be extremely basic.

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Select the most complete explanation of what the pH scale actually measures.

A) The acidity of a solvent

B) The alkalinity of a solvent

C)The concentration of hydrogen ions in a solution

D)The concentration of hydroxide ions in a solute

The molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).

To calculate the molarity of the KMnO4 solution, we need to use the stoichiometry of the reaction and the volume of the KMnO4 solution used in the titration.

Given:

Mass of H2O2 solution = 1.0 g

Concentration of H2O2 solution = 30 wt% (weight percent)

Volume of KMnO4 solution used = 22.143 mL

Molar mass of H2O2 = 34.01 g/mol

Step 1: Calculate the moles of H2O2 in the solution.

Moles of H2O2 = (Mass of H2O2 solution) / (Molar mass of H2O2)

= 1.0 g / 34.01 g/mol

= 0.0294 mol

Step 2: Calculate the moles of KMnO4 based on the stoichiometry of the reaction.

According to the balanced equation, the ratio of KMnO4 to H2O2 is 2:5.

Therefore, moles of KMnO4 = (Moles of H2O2) * (2/5)

= 0.0294 mol * (2/5)

= 0.01176 mol

Step 3: Calculate the molarity of the KMnO4 solution.

Molarity (M) = (Moles of KMnO4) / (Volume of KMnO4 solution in liters)

= 0.01176 mol / 0.022143 L

= 0.5316 M

Therefore, the molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).

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Answer:

Final volume of the gas is 4.837mL

Explanation:

Initial volume (V1) = 350mL = 0.35L

Initial temperature (T1) = 0°C = (0 + 273.15)k = 273.15k

Initial pressure (P1) = 1.0atm

Final volume (V2) = ?

Final temperature (T2) = 10°C = (10 + 273.15)k = 283.15K

Final pressure (P2) = 75atm

To solve this question, we'll have to use combined gas equation which is the combination of all gas law I.e Charle's laws, Boyle's law, Pressure law etc.

According to combined gas equation,

(P1 × V1) / T1 = (P2 × V2) / T2

Make V2 the subject of formula,

V2 = (P1 × V1 × T2) / (P2 × T1)

V2 = (1.0 × 0.35 × 283.15) / (75 × 273.15)

V2 = 99.1025 / 20,486.25

V2 = 0.004837L

V2 = 4.837mL

The final volume of the gas is 4.837mL

Answer:

4.84mL

Explanation:

Step 1:

Data obtained from the question. This include the following:

Initial volume (V1) = 350mL

Initial temperature (T1) = 0°C

Initial pressure (P1) = 1atm

Final temperature (T2) = 10°C

Final pressure (P2) = 75atm

Final volume (V2) =...?

Step 2:

Conversion of celsius temperature to Kelvin temperature.

This can be achieved by using the formula below:

T(K) = T (°C) + 273

Initial temperature (T1) = 0°C

Initial temperature (T1) = 0°C + 273 = 273K

Final temperature (T2) = 10°C

Final temperature (T2) = 10°C + 273 = 283K

Step 3:

Determination of the new volume.

The new volume can be obtained by using the general gas equation as follow:

P1V1/T1 = P2V2/T2

1 x 350/273 = 75 x V2/283

Cross multiply

273 x 75 x V2 = 1 x 350 x 283

Divide both side by 273 x 75

V2 = (1 x 350 x 283) / (273 x 75)

V2 = 4.84mL

Therefore, the new volume is 4.84mL

Answer:

Br^-1

Explanation:

It is an ion that gained an extra electron making it 36 electrons but the other. one is in the neutral state with 35 electrons

When Francine combines 5.0 ml of 0.8 m KOH to 2.0 ml of 6.0 m HBr, the resulting solution will get acidic in nature because of more number of moles of HBr.

The chemical equation of the mentioned reaction is given as,

HBr + KOH → KBr + H₂O

As we can see, one mole of HBr reacts with one mole of KOH.

So, we can say that moles of HBr are equal to the moles of KOH.

Millimoles = Molarity x Volume

Now, it is given to us that Francine combines 5.0 ml of 0.8 m KOH to 2.0 ml of 6.0 m HBr.

Millimoles of KOH = 4 x 0.8

Millimoles of KOH = 4

Millimoles of HBr = 2 x 6

Millimoles of HBr = 12

As we see, that the millimoles of HBr are greater than that of KOH, so, the resulting solution will be Acidic in nature.

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The star is moving by a velocity of 3 *10^{5}.

The formula for the Doppler shift is given by

f2/f1 = (c-v)/c,

where c is the speed of light, v is the velocity of the moving object, and f1 and f2 are the emitted and received frequencies of light, respectively.

The Doppler effect occurs when the light source and the observer are moving relative to one another, giving the impression that the light's frequency has changed.

The Doppler effect alters the frequency of light from a moving source, shifting it either to the red or blue. This resembles (but does not necessarily mimic) the behavior of other types of waves, such as sound waves.

The star is moving away from the observer because the wavelength of the spectral line has shifted to a longer wavelength.

doppler shift

Thus, the velocity is given by the formula

:v/c = (Δλ/λ)

where  is the rest wavelength and  is the change in wavelength.

v/c = (Δλ/λ)v/c = (1000.1 - 1000.0)/1000.0v/c = 0.0001/1000.

0v/c = 1e-7v = (1e-7) × c = 300 × 1e-7 = 3e-5

The star is moving away from the observer at a velocity of\(3 *10^{5}\)m/s.

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the actual quantity of nitrogen, phosphorus, and potassium guaranteed to be applied to the maize field is 50 kg, 50 kg, and 25 kg, respectively.

For Nitrogen (N):

The percentage of nitrogen in the fertilizer is 20%. Therefore, the amount of nitrogen applied can be calculated as:

Nitrogen = (20/100) * 250 kg

Nitrogen = 0.2 * 250 kg

Nitrogen = 50 kg

For Phosphorus (P):

The percentage of phosphorus in the fertilizer is also 20%. Thus, the amount of phosphorus applied can be calculated as:

Phosphorus = (20/100) * 250 kg

Phosphorus = 0.2 * 250 kg

Phosphorus = 50 kg

For Potassium (K):

The percentage of potassium in the fertilizer is 10%. So, the amount of potassium applied can be determined as:

Potassium = (10/100) * 250 kg

Potassium = 0.1 * 250 kg

Potassium = 25 kg

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a) The concentration of N_2O_4 in the container after one half-life of the reaction is 1.4 moll L.

b) The concentration after 60 seconds is option B 0.60 M.

What are the 3 types of concentration?

The three types of concentration commonly used in chemistry are:

Molarity (M): This is the most commonly used type of concentration, and it is defined as the number of moles of solute per liter of solution. Molarity is represented by the symbol "M".

Molality (m): This is a concentration unit that measures the number of moles of solute per kilogram of solvent. Molality is represented by the symbol "m".

Mass Percent (%m/m): This is a concentration unit that measures the mass of solute per 100 grams of solution. It is also called weight percent. Mass percent is represented by the symbol "%m/m".

The explanation of the answer is given below.

Therefore, The concentration of N_2O_4 in the container after one half-life is 1.4 moll L and concentration after 60 seconds is 0.60 M.

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Answer:

inorganic chemicals

Explanation:

Organisms that use inorganic chemicals as a source of energy and convert them into organic substances are known as Chemosynthetic bacteria. Unlike plants, they obtain their energy from the oxidation of inorganic molecules, rather than photosynthesis. Chemosynthetic bacteria use inorganic molecules, such as ammonia, molecular hydrogen, sulphur, hydrogen sulphide and ferrous iron, to produce the organic compounds needed for their subsistence. Chemosynthetic bacteria are found in deep-sea or in the areas where sunlight does not penetrate.

The property of the covalent compound that is influenced by ionic character is boiling point. Option B

We know that for compounds, the kind of bonds that they have are usually neither here nor there. The bonds would have an ionic character and also a given amount of the covalent character.

We must note that the ionic character of a bond is very important when we discuss intermolecular interactions and they do affect the boiling points of the substances very much.

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Answer:

Exothermic reaction

Explanation:

It is an exothermic reaction i.e. energy is released during the reaction.

Answer:

first option is not true

Explanation:

1 mole = 6.02 × 10²³ particles

C3H8 has 1 mole, so has 6.02 × 10²³ particles

5O2 has 5 moles so 5 × 6.02 × 10²³ = 3.01 × 10²⁴ particles

3CO2 has 3 moles so 3 × 6.02 × 10²³ = 1.806 × 10²⁴ particles

4H2O has 4 moles so 4 × 6.02 × 10²³ = 2.408 × 10²⁴ particles

Answer:

A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.

Explanation:

A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.

To find the concentration of the solution, we need to calculate the amount of salt in moles per liter of solution (mol/L).

First, we need to convert the mass of salt to moles using its molar mass. The molar mass of salt (NaCl) is 58.44 g/mol.

Number of moles of salt = 22.0 g / 58.44 g/mol = 0.376 mol

Next, we need to calculate the volume of the solution in liters. We are given that 200 mL of water is used, which is 0.2 L.

Volume of solution = 0.2 L

Finally, we can calculate the concentration of the solution using the formula:

Concentration (in mol/L) = amount of solute (in mol) / volume of solution (in L)

Concentration = 0.376 mol / 0.2 L = 1.88 mol/L

Therefore, the concentration of the solution made by mixing 22.0 g of salt with 200 mL of water is 1.88 mol/L.

What is a solution?

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