Please help, lol :)) <--------------

Answer:

For anyone that still needs the answer it's:

2.) Inspect the Bunsen burner and gas tubing for damage.

3.) Move her lab notebook and papers so they are away from the burner.

Explanation:

2 and 3 is right on edge

Bunsen burners are the laboratory equipment used in experiments. Maria should inspect the burner and move her papers and book away before burning. Thus, options b and c are correct.

Bunsen burners are the equipment used in laboratories for heating and sterilizing processes. It is a device used to produce flames using atmospheric oxygen gas and fuel in the burner.

While using the bunsen burner, laboratory safety procedures should be practiced to ensure the safety of the person as well as the working place. Before igniting the burner should be inspected and checked for any leakages.

The notebooks and papers must be placed away from eh burner to avoid any fire accidents as they are easily flammable and can catch fire.

Therefore, options b and c. gas tubing must be inspected before lighting the burner.

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Activation energy is the amount of energy required for a chemical reaction to occur.

The energy required for molecules to react with one another is known as activation energy. Activation energy is the minimum quantity of energy needed for a chemical reaction to occur. It is generally the energy necessary to get reactants over an energy barrier to reach the intermediate condition that then leads to product development. The reaction's rate is affected by the activation energy.The activation energy for a reaction may be calculated from the energy required to break the bond or bonds in the reactants and the energy liberated when new bonds are formed in the products. By determining the activation energy of a reaction, one can determine how quickly a reaction will occur. Thus, the activation energy is an essential term for many chemical reactions.Activation energy is the amount of energy required for a chemical reaction to occur. In general, it is the energy required to get reactants over an energy barrier to reach the intermediate state, which then leads to product formation. It is an essential term for many chemical reactions.

Activation energy is the energy required for a chemical reaction to occur. In general, it is the energy required to get reactants over an energy barrier to reach the intermediate state that then leads to product development. It is calculated from the energy required to break the bond or bonds in the reactants and the energy liberated when new bonds are formed in the products. Therefore, activation energy is an essential term for many chemical reactions.

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Answer:

The burning of a candle is both a physical and a chemical change.

Explanation:

Plz mark brainliest thanks

The frequency of the color light, given that it has a wavelength of 5.0×10⁻⁷ m is 6.0×10¹⁴ Hertz (last option)

First, we shall list out the given parameters from the question. This is shown below:

Speed, wavelength and frequency of wave are related by the following formula:

Velocity (v) = wavelength (λ) × frequency (f)

Inputting the given parameters, we can obtain the frequency as shown below:

3×10⁸ = 5.0×10⁻⁷ × frequency

Divide both sides by 5.0×10⁻⁷

Frequency = 3×10⁸ / 5.0×10⁻⁷

= 6.0×10¹⁴ Hertz

Thus, we can conclude that the frequency of the color light is 6.0×10¹⁴ Hertz (last option)

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Explanation:

In a solid particles are firmly together and are stuck in a regular pattern

in a liquid particles still touch but arent in a fixed pattern

in a gas particles move quickly in all directions

Answer:

Option B. 4 moles of the gaseous product

Explanation:

Data obtained from the question include:

Initial volume (V1) = V

Initial number of mole (n1) = 2 moles

Final volume (V2) = 2V

Final number of mole (n2) =..?

Applying the Avogadro's law equation, we can obtain the number of mole of the gaseous product as follow:

V1/n1 = V2/n2

V/2 = 2V/n2

Cross multiply

V x n2 = 2 x 2V

Divide both side by V

n2 = (2 x 2V)/V

n2 = 2 x 2

n2 = 4 moles

Therefore, 4 moles of the gaseous product were produced.

(a) The reduced mass of the muon in muonic hydrogen is 186.88 MeV/c².

(b) The binding energy of a muon in the ground state of muonic hydrogen is 207.6 keV.

(a) The reduced mass of the muon in muonic hydrogen is given by;

μ = (mμmH) / (mμ + mH)

where,

mμ is the mass of the muon and mH is the mass of the proton.

Reduced mass of the muon in muonic hydrogen:

μ = (0.1134 GeV/c² × 1.00783 GeV/c²) / (0.1134 GeV/c² + 1.00783 GeV/c²)

μ = 186.88 MeV/c²

(b) The binding energy, H of muonic hydrogen is given by;

H = (mc² - E)

where,

mc² is the mass of the muonic hydrogen and E is its total energy.

Hydrogen's binding energy is given by:

E = (-13.6 eV) / n²,

where

n is the principal quantum number.

μonic hydrogen's mass, mc² = mμ + mH - E/c²

Binding energy of a muon in the ground state of muonic hydrogen,

H1sH = (mμ + mH - E/c²) - mc²

H1sH = (0.1134 GeV/c² + 1.00783 GeV/c² - 2.24 GeV) - (0.1134 GeV/c² + 1.00783 GeV/c²)

H1sH = 207.6 keV

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We need 3.0 moles of Cu(OH)2 to completely react with 2.0 moles of H3PO4. It is important to balance the chemical equation before performing any mole calculations to ensure accurate results.

To determine the number of moles of Cu(OH)2 needed to completely react 2.0 moles of H3PO4, we need to balance the chemical equation for the reaction. The balanced chemical equation is:
3Cu(OH)2 + 2H3PO4 → Cu3(PO4)2 + 6H2O
From this equation, we can see that 3 moles of Cu(OH)2 are needed to react with 2 moles of H3PO4. Therefore, to completely react with 2.0 moles of H3PO4, we need:
(2.0 moles H3PO4) x (3 moles Cu(OH)2/2 moles H3PO4) = 3.0 moles Cu(OH)2
Therefore, we need 3.0 moles of Cu(OH)2 to completely react with 2.0 moles of H3PO4. It is important to balance the chemical equation before performing any mole calculations to ensure accurate results.

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Answer:

C. Igneous, Metamorphic, Sedimentary

Explanation:

I learned this on IXL in elementary school :)

Answer:

C. Igneous, Metamorphic, Sedimentary

Metallic elements exist in a solid-state and they are opaque, have a shiny surface, good conductors of electricity and heat, malleable and ductile, and are dense. The structure of metals is formed by atoms that are held together by metallic bonds. These atoms have loosely bound valence electrons that can be shared between the neighboring atoms.

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Answer:

Yes it is.

Explanation:

If you melted down the sugar, you can clearly use it.

Answer:

Molarity is moles per liter. You have one mole in 0.750 liters

Explanation:

The byprοducts in this reactiοn are acetic acid (οptiοn A) and ethanοl (οptiοn C).

In acid catalysis and base catalysis, a chemical reactiοn is catalyzed by an acid οr a base. By Brønsted–Lοwry acid–base theοry, the acid is the prοtοn (hydrοgen iοn, H+) dοnοr and the base is the prοtοn acceptοr. Typical reactiοns catalyzed by prοtοn transfer are esterificatiοns and aldοl reactiοns.

The acid-catalysed hydrοlysis οf diethyl acetamidοbenzylmalοnate can lead tο variοus by prοducts depending οn the reactiοn cοnditiοns and specific chemical pathways. Hοwever, withοut mοre detailed infοrmatiοn οr a specific reactiοn mechanism, it is difficult tο prοvide a cοmprehensive list οf the by prοducts that may fοrm.

Based οn the infοrmatiοn prοvided, the acid-catalysed hydrοlysis οf diethyl acetamidοbenzylmalοnate delivers the desired (+)-phenylalanine hydrοchlοride prοduct and the fοllοwing byprοduct(s):

E. Bοth A and C: Acetic acid and ethanοl.

The hydrοlysis οf diethyl acetamidοbenzylmalοnate invοlves the cleavage οf ester bοnds, resulting in the fοrmatiοn οf acetic acid as a byprοduct. Additiοnally, since diethyl acetamidοbenzylmalοnate is an ester, hydrοlysis οf the ester bοnds can alsο prοduce ethanοl as anοther byprοduct.

Therefοre, the byprοducts in this reactiοn are acetic acid (οptiοn A) and ethanοl (οptiοn C).

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Complete Question :

Answer:

5 H atoms per NH4OH

Explanation:

5NH4OH

NH4OH is a chemical formula.  It has 5 H atoms per each molecule.  NH4OH

5NH4OH means 5 molecules (or moles) of NH4OH.  But the question asks per chemical formula, so 5 is correct,

There would be 5x4 or 20 atoms of H is 5 molecules of NH4OH.

there are two isomers that exist for the octahedral complex ion [Co(NH3)4F2]. The first isomer is the cis isomer, where the two F ligands are located on adjacent corners of the octahedron, and the other four NH3 ligands occupy the other corners.

there are two isomers that exist for the octahedral complex ion [Co(NH3)4F2]. The first isomer is the cis isomer, where the two F ligands are located on adjacent corners of the octahedron, and the other four NH3 ligands occupy the other corners. The second isomer is the trans isomer, where the two F ligands are located on opposite corners of the octahedron, and the four NH3 ligands occupy the remaining corners. The explanation for this is that the NH3 ligands are neutral and do not have any preference for the orientation in the complex, but the F ligands are negatively charged and repel each other, causing them to have a preference for either adjacent or opposite corners. Therefore, the two possible arrangements of the F ligands lead to the two isomers of the complex ion.

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Answer:

Radiowave,Microwave, Infared,UV,X-Ray, Gamma

radio,microwave, ultraviolet,x ray,gamma ray

Explanation:

I looked it up at a NASA link

The work done by the gas is -8.00 L.atm.

Given data:

Initial volume = 8.00 L

Final volume = 16.0 L

External pressure = 1.00 atm

The equation for the work done by a gas during a reversible, isothermal process is given by: W = - nRT \ln \frac{V_f}{V_i}

where n is the number of moles of the gas, R is the gas constant (8.31 J/(mol.K) for ideal gases), T is the temperature in Kelvin, V_i and V_f are the initial and final volumes of the gas respectively.

Since the pressure of the gas is constant, the process is isobaric (constant pressure).

Therefore, W = - P \Delta V$$where P is the external pressure and $\Delta V = V_f - V_i is the change in volume. ,

Substituting the given values into the above equation, we haveW = - (1.00 \; \text{atm}) \times (16.0 \; \text{L} - 8.00 \; \text{L})W = -8.00 \; \text{L.atm}

Hence, the work done by the gas is -8.00 L.atm.

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The pH at which amylase activity is most active depends on the specific type of amylase being considered. However, generally speaking, amylase activity is most active at a pH around 6.5 to 7. This pH range is close to neutral, reflecting the optimum conditions for the enzyme's function.

Amylase is an enzyme that catalyzes the breakdown of starch into smaller sugar molecules. It is produced in various organisms, including humans and microorganisms. The optimal pH for amylase activity is important because it directly affects the enzyme's structure and activity.

At a pH above or below the optimum range, the enzyme's activity decreases. The active site of the amylase enzyme undergoes conformational changes at extreme pH values, leading to a reduced ability to bind to substrates and catalyze the reaction effectively. Consequently, the rate of starch hydrolysis is lower.

The significance of determining the pH at which amylase activity is most active lies in understanding the enzyme's functionality and its application in different settings. It helps optimize conditions for various industries that rely on amylase, such as food and beverage production, where controlling pH can enhance enzymatic activity and overall process efficiency. Additionally, this knowledge aids in understanding the role of amylase in biological systems and its implications for digestion and metabolic processes.

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Answer:

Answer 9 - 100 joules energy was at the producer level

Answer 10 - Remaining energy is used in metabolism

Explanation:

Answer 9

The energy at each trophic level is only 10% of the energy at its previous trophic level.

The energy at producer level is X

\(10\) % of \(X = 10\) Joules

\(\frac{10}{100} * X = 10\\X = 100\)Joules

Answer 10

Because the remaining 90% energy is utilized by the producer for its metabolism

The portion of energy from the Sun that reaches the Earth​ is known as

electromagnetic spectrum.

Energy transfer from objects in space such as the Sun usually reach the

earth through the process known as radiation. The energy is referred to as

electromagnetic energy.

Components of the electromagnetic spectrum are:

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The vapor pressure of the aqueous solution that is containing 14% (by weight) ethylene glycol is 22.72 torr.

Consider the 100 g solution.

The Ethylene glycol mass = 14 g

The water mass = 100 g - 14 g

The water mass = 86 g moles.

The moles of Ethylene glycol = 14 / 62

The moles of Ethylene glycol = 0.225 moles.

The moles of water = 86 / 18 g = 4.77 moles

Total moles = 0.225 + 4.77

Total moles = 4.99 moles

The mole fraction of the water = 4.77 moles / 4.99 moles  

The mole fraction of the water = 0.955

The Vapor pressure = mole fraction of water ×   water vapor pressure The Vapor pressure =  (0.955)(23.8 torr)

The Vapor pressure = 22.72 torr.

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Answer:

c.  

Fluorine

Explanation:

Answer:

Here boron-11 means the name of the element is boron and the mass number is 11

Explanation:

Answer:

i think it c

Explanation:

The correct answer to the question is the fourth option, where a molecule of ammonia combines with a proton to form the complex ion known as ammonium. This is an example of a Lewis acid-base reaction, where ammonia acts as a Lewis base and accepts a proton from a Lewis acid, forming a new compound. The other options do not involve Lewis acid-base reactions. For example, the first option involves an ionic bond formation between an ammonium ion and a chloride ion, and the second option involves a redox reaction between metallic potassium and oxygen. The third option involves a single displacement reaction between zinc and copper ions in a chloride salt.

A Lewis acid is a molecule or an ion that can accept an electron pair, while a Lewis base is a molecule or an ion that can donate an electron pair. In a Lewis acid-base reaction, a Lewis acid accepts an electron pair from a Lewis base to form a new compound.

Among the given options, the fourth option is an example of a Lewis acid-base reaction. In this option, a molecule of ammonia (NH3) acts as a Lewis base and accepts a proton (H+) from a Lewis acid to form the complex ion known as ammonium (NH4+). Here, the proton acts as a Lewis acid by accepting the electron pair from the nitrogen atom in ammonia.
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The Calcium atom has 2 valence electrons but a Calcium ion will have no electrons because it is a cation ion. Meaning that there are more protons than electrons. Also, the normal calcium symbol is Ca but the calcium ion is Ca²⁺

I hope this wasn't too late

The correct answer is B. 0.35 g.

To calculate the mass of the sample that remains unchanged after 25.53 minutes, we need to use the half-life of iron-53, which is 8.51 minutes.

First, we need to determine how many half-lives have elapsed during the 25.53 minutes.

25.53 min / 8.51 min per half-life = 3 half-lives

This means that the original sample has gone through three half-lives, leaving us with one-eighth of the original amount of iron-53.

1/2 * 1/2 * 1/2 = 1/8

To find the mass of the remaining iron-53, we can multiply the original mass by 1/8:

5.60 g * 1/8 = 0.70 g

However, the question asks for the mass to be expressed to two significant figures, which means that we need to round the answer to 0.35 g. Therefore, the correct answer is B. 0.35 g.

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