Which set of conditions reflect STP? A) 298 K, 1 atm B) 25°C, 14.7 psi C) 373 K, 760 torr D) 273 K, 1 Pa E) 273 K, 760 mm Hg

Answer: A, C, E

Explanation:

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Answer:

A, C, E

Explanation:

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The electron in the energy level of 10 can absorb the photon with energy 5 and transition to the energy level of 15 (10 + 5), which is higher than the original energy level. This process is known as an excitation process.

Alternatively, the photon can also be emitted by the electron, leading to a decrease in the electron's energy level to 5 (10 - 5), which is a lower energy level than the original level. Consequently, the electron will not jump to a new energy level and will likely emit the photon soon after, returning to its initial energy level of 10. This process is known as an emission process.

The specific process that occurs will depend on various factors such as the energy and direction of the photon, and the energy levels and positions of the electrons in the atom. However, in general, the atom will undergo a change in energy level due to the interaction with the photon.

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A possible consequence of adding buffer, such as dipotassium phosphate, to raise the starting pH of a solution to 7.8 is the potential alteration of microbial growth patterns and selective inhibition of certain organisms.

Buffers are substances that resist changes in pH and help maintain the desired pH level in a solution. In the case of EMB (Eosin Methylene Blue) agar, which is commonly used for the selective isolation and differentiation of Gram-negative bacteria, the addition of a buffer to raise the starting pH to 7.8 could result in a higher alkaline environment.

This increase in pH may favor the growth of alkaliphilic or alkaline-tolerant microorganisms, while inhibiting the growth of acidophilic or acid-sensitive organisms. Some species of Gram-negative bacteria, which are the target organisms for isolation on EMB agar, may be negatively affected by the higher pH and show reduced growth or limited colony formation.

Additionally, altering the pH outside the optimal range for microbial growth can disrupt the delicate balance of the microbial community and potentially lead to the overgrowth or suppression of certain species. This can affect the accuracy of diagnostic tests, compromise the selective properties of the medium, and impact the identification of specific pathogens.

In conclusion, raising the starting pH to 7.8 by adding buffers to EMB agar may result in selective inhibition of certain organisms and alter the microbial growth patterns, potentially affecting the accuracy and reliability of the medium for its intended purpose. Careful consideration of the pH requirements and the specific goals of the microbial analysis should be taken into account when adjusting the pH using buffers.

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Answer:

true

Explanation:

The matching words are;

A. Breaking; forming; positive.

B. Twice; half.

A. The reaction results in the formation of twenty blue-red bonds after the breakdown of five blue-blue and twenty blue-red bonds. Bond-breaking enthalpies are usually positive.

B. It is assumed that both reactants and products in the reaction shown are in the gas phase. The products include twice as many gas molecules, while the reaction's delta S value is just 50%.

Bond enthalpy measures the amount of energy needed to break a mole of a specific bond and is always positive because it is an endothermic reaction.

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Missing parts;

Match the words in the left column to the appropriate blanks in the sentences on the right. Note that some words may be used more than once and some may not be used.

1. breaking

2. forming

3. positive

4. negative

5. twice

6. half

A. The reaction involves___five blue-blue and twenty blue-red bonds and then____twenty blue-red bonds. Enthalpies for bond breaking are always_____.

B. In the depicted reaction, both reactants and products are assumed to be in the gas phase. There are___as many molecules of in the products, delta S is___for this reaction

Answer:

I need more information.

Explanation:

Answer:

The answer is metalloids.

The metalloids are a unique group of elements that share properties of both metals and nonmetals. They're also called the semimetals because of the shared properties of these elements along the dividing line between metals and nonmetals.

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Answer:

hi hehe I'm new here hehehe

Answer:

density = 2g/cm³

Explanation:

density = mass/volume

mass = 20g

volume = 10cm³

density = 20g/10cm³

density = 2g/cm³

In her statement, Nikki Giovanni refers to the collective "we," which could be interpreted as society as a whole or a specific group of people who may be struggling with their sense of identity.

She is speaking to those who may feel lost or unsure of their place in the world and who may benefit from gaining a greater understanding of themselves. By emphasizing the importance of confidence in our knowledge of who we are, Giovanni is stressing the significance of self-awareness and self-acceptance. When we have confidence in our identity, we are better equipped to navigate life's challenges and pursue our goals and aspirations. Additionally, this sense of self-assurance can positively impact our relationships with others, as it allows us to be more genuine and authentic in our interactions.

In conclusion, Giovanni's statement is a call to action for all of us to embrace our unique identities and cultivate confidence in who we are. It is a reminder that our sense of self is a powerful tool that can empower us to live more fulfilling lives.

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Answer: as a relatively high boiling point high specific heat connotation adhesion and density

Explanation:

water molecules are polar so they form hydrogen bonds this gives water unique properties

Answer: Yes, sulfuric acid is highly soluble in water.

Explanation:

Approximately 18.4832 mL of 0.250 M NaOH is required to neutralize 30.4 mL of 0.152 M HCl.

To determine the volume of 0.250 M NaOH required to neutralize 30.4 mL of 0.152 M HCl, we can use the concept of stoichiometry and the balanced chemical equation for the neutralization reaction between NaOH and HCl:

NaOH + HCl -> NaCl + H2O

From the balanced equation, we can see that the stoichiometric ratio between NaOH and HCl is 1:1. This means that for every mole of NaOH, we require an equal number of moles of HCl to neutralize.

First, let's calculate the number of moles of HCl present in the given volume:

Moles of HCl = concentration of HCl * volume of HCl

= 0.152 M * 30.4 mL

= 4.6208 mmol (millimoles)

Since the stoichiometric ratio is 1:1, the number of moles of NaOH required to neutralize the HCl is also 4.6208 mmol.

Now, let's calculate the volume of 0.250 M NaOH needed to contain 4.6208 mmol:

Volume of NaOH = (moles of NaOH) / (concentration of NaOH)

= 4.6208 mmol / 0.250 M

= 18.4832 mL

Therefore, approximately 18.4832 mL of 0.250 M NaOH is required to neutralize 30.4 mL of 0.152 M HCl.

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The number of moles of water that vaporized during the first five minutes would be 2.78 moles (50 g / 18 g/mol = 2.78 moles).

Moles are a kind of small mammal found in many parts of the world. They are burrowing animals, living underground in burrows and tunnels. They have adapted to life underground and have physical features that help them survive in this environment, such as small eyes and ears, short legs and strong claws. They feed mainly on grubs, worms, and other small invertebrates found underground. They also eat some plant material and occasionally small animals. Moles are solitary animals and live in small family groups. They play an important role in the ecosystem, aerating and fertilizing the soil.

In order to calculate the number of moles of water that vaporized during the first five minutes, we must first calculate the mass of water vaporized during the same time period. This can be done by subtracting the mass of water remaining in the beaker after five minutes from the initial mass of water in the beaker. Once the mass of water vaporized is determined, it can then be converted to moles using the equation mass (g) = moles x molar mass (g/mol).

Assuming the initial mass of water in the beaker was 100 g, and the mass of water remaining in the beaker after five minutes was 50 g, the mass of water vaporized during this time period would be 50 g. To convert this to moles, we would use the equation mass (g) = moles x molar mass (g/mol). Since the molar mass of water is 18 g/mol, the number of moles of water that vaporized during the first five minutes would be 2.78 moles (50 g / 18 g/mol = 2.78 moles).

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Answer:

Ice is hard/solid, while water is liquid.

Explanation:

The structure of water molecules in ice is much closer together than that of water. Because the molecules are so close together, they are unable to move past each other and thus occupy a set shape and volume as ice.

The structure of water molecules in water, on the other hand, is further apart when compared to ice. Because they are further apart (and have more energy), the molecules are able to slip past each other and thus present as a liquid with a set volume, but not necessarily shape.

Note: Water can of course change phases. By taking energy away from the water we can turn it into ice (molecules slow down until they are stationary). By adding energy to the water we can turn it into steam/vapor (molecules are moving incredibly quickly with great energy and can freely move).

Explanation:

V1/T1 = V2/T2      T  must be in Kelvin

12.78 / (-50 + 273.15)  =  V2 / ( 28+ 273.15)

V2 = 17.25 L

The object and the reservoir have the same temperature: In thermal equilibrium, the temperature of the object and the temperature of the reservoir are equal. There is no net heat transfer occurring between the two.

There is no change in temperature over time: In thermal equilibrium, the temperature of the object remains constant over time. There is no net flow of heat between the object and the reservoir.The object and the reservoir are in thermal contact: For thermal equilibrium to be achieved, the object and the reservoir must be in direct or indirect thermal contact. This allows for the transfer of thermal energy between them until their temperatures equalize.

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Answer:

FREE POINT!!!!!!!!

Explanation:

Answer:

Water

Explanation:

hydrogen + oxygen = water

Answer:

I will use pulley b

Explanation:

because the pulley with more efficency can carry out the work better

The law of conservation of the mass is useful for the chemical changes as  if the substance undergoes the chemical change, the product will  have the same mass though it.

The law of conservation of the mass states that the mass is neither created nor be destroyed, it can be only  transformed. The mass of the product  formed  is exactly equal to the mass of the reactants. If the original substance will undergoes the chemical change, the product formed will  have the equal mass of the reactant though it can  be present  in the another form.

Thus, the law of the conservation of mass is related to the chemical change as the mass neither be created nor be destroyed.

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Answer: Light

Explanation:

The environment abiotic factors like sunlight, water, air, and soil are important for the growth of the plants. A wildflowers is a plant that grows in wild. It was not intentionally seeded or planted.

The light is one of the important environmental factor. As the wildflowers are blooming earlier than the large trees. Thus the wildflowers are receiving the light earlier than large trees.

Answer:

A half-equation shows you what happens at one of the electrodes during electrolysis. Electrons are shown as e-. A half-equation is balanced by adding, or taking away, a number of electrons equal to the total number of charges on the ions in the equation.

When positive metal ions (cations) arrive at the negative electrode (the cathode), they gain electrons to form neutral metal atoms. This is called reduction. For example:

Pb2+ + 2e- → Pb

When negative non-metal ions (anions) arrive at the positive electrode (the anode), they lose electrons to form neutral atoms or molecules. This is called oxidation. For example:

2Br- → Br2 + 2e-

Writing half equations

Cations go to the cathode. They need to gain enough electrons to make them neutral. So an Al3+ ion needs to gain three electrons:

Al3+ + 3e- → Al

Half-equations for non-metal anions are more difficult to balance. For example, chloride ions make chlorine gas. Most non-metal elements formed in electrolysis are diatomic molecules (eg Cl2). For example:

Cl- → Cl2

Add in two electrons to balance the charge so that both sides have the same charge. The two electrons need to go on the right-hand side, so that both sides have an overall charge of -2. For example:

2Cl- → Cl2 + 2e-

Although your question lacks some information a general answer is provided

The ionic half equation =  \(2H^{+} (aq) + 2e^{-} ----> H_{2} (g)\)

The formation of hydrogen takes place at the negative electrode in a cell and the ionic half reaction that shows the formation of the hydrogen gas at the electrode is written as :

\(2H^{+} (aq) + 2e^{-} ----> H_{2} (g)\)

Ionic half equation is the representation of the chemical activity ( reaction ) occurring at one of the electrodes of a cell. to balance a half reaction we add or remove electrons equal to charges on the ions.

Hence the Ionic half equation for the formation of hydrogen during electrolysis is written as ; \(2H^{+} (aq) + 2e^{-} ----> H_{2} (g)\)

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Answer:

Refractive index

Heat capacity

Density

Explanation:

Properties that are used to identify materials are called intensive properties. These intensive properties are characteristic of the material and does not depend on the amount of material present.

Thus, if i want to identify whether the three bars are made of the same metal, i can look out for the following properties;

Refractive index

Heat capacity

Density

These properties are intensive properties thus they can be used to identify an unknown substance.

Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

We need to write the balanced chemical equation for the reaction that forms one mole of the compound from its constituent elements. This reaction is: Cr(s) + 3/2 N2(g) + 9/2 O2(g) → Cr(NO3)3(s)

A standard formation reaction is a chemical reaction that forms one mole of a compound from its constituent elements under standard conditions of temperature and pressure. In this case, we need to write a balanced chemical equation for the standard formation reaction of solid chromium(III) nitrate.
Firstly, we need to identify the elements present in the compound. Chromium(III) nitrate contains the elements chromium (Cr), nitrogen (N), and oxygen (O).
Next, we need to write the balanced chemical equation for the reaction that forms one mole of the compound from its constituent elements. This reaction is:
Cr(s) + 3/2 N2(g) + 9/2 O2(g) → Cr(NO3)3(s)
This equation shows that one mole of solid chromium(III) nitrate is formed from one mole of solid chromium, 1.5 moles of nitrogen gas, and 4.5 moles of oxygen gas under standard conditions.
In summary, the standard formation reaction for solid chromium(III) nitrate is:
Cr(s) + 3/2 N2(g) + 9/2 O2(g) → Cr(NO3)3(s)

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Answer: The mass density is 1166.36 \(kg/m^{3}\).

Explanation:

Given: Weight of sample in air \((F_{air})\) = 500 N

Weight of sample in alcohol \((F_{alc})\) = 200 N

Specific gravity = 0.7 = \(0.7 \times 1000 = 700 kg/m^{3}\)

Formula used to calculate Buoyant force is as follows.

\(F_{B} = F_{air} - F_{alc}\\= 500 - 200 \\= 300 N\)

Hence, volume of the material is calculated as follows.

\(V = \frac{F_{B}}{\rho \times g}\)

where,

\(F_{B}\) = Buoyant force

\(\rho\) = specific gravity

g = acceleration due to gravity = 9.81

Substitute the values into above formula.

\(V = \frac{F_{B}}{\rho \times g}\\= \frac{300}{700 \times 9.81}\\= \frac{300}{6867}\\= 0.0437 m^{3}\)

Now, mass of the material is calculated as follows.

\(mass = \frac{F_{air}}{g}\\= \frac{500 N}{9.81}\\= 50.97 kg\)

Therefore, density of the material or mass density is as follows.

\(Density = \frac{mass}{volume}\\= \frac{50.97 kg}{0.0437 m^{3}}\\= 1166.36 kg/m^{3}\)

Thus, we can conclude that the mass density is 1166.36 \(kg/m^{3}\).

Answer:

answer is B

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Answer:

magnet is one

Explanation:

metals attach to magnets

Answer:

Explanation:

Check if they are ductile and malleable

If they are conductive

Metals produce hydrogen gas on reacting with acid

If they are sonorous

Or if you don’t have physical identity of them you can rather check it out in the periodic table.