Check all examples that would be considered a physical property.

a
flammability (burns)
b
solubility (dissolves)
c
blue color
d
sour taste
e
melting point
f
mass
g
reacts with water
h
texture

Answer:

powdered sugar

Explanation:

The higher is the exposed area of sugar, the faster is the dissolution process. Thus, to choose between the different types of sugar, we have to look at the volume occupied by the sugar.

In sugar cubes, the particles of sugar as compacted in a cube, so the particles inside the cube are not exposed to the solvent (water). So, sugar cubes have the slowest dissolution process. Then, in granulated sugar, the particles have more area exposed, so this type of sugar will dissolve faster than sugar cubes. Finally, powdered sugar is composed of tiny particles with more are exposed, so powdered sugar has the fastest dissolution process.

Therefore, powdered sugar will dissolve the fastest.

Answer:D

Explanation:

If the atomic masses of 63Li and 73Li are 6.0151 amu and 7.0160 amu, respectively, then the natural abundances of these two isotopes would be respectively given that the average atomic mass of Li is 6.941 amu.

It is the sum of the mass of all the protons as well as the neutrons that are present inside the nucleus.

As given in the problem, the atomic masses of 63Li and 73Li are 6.0151 amu and 7.0160 amu, respectively and we have to calculate the natural abundances of these two isotopes. The average atomic mass of Li is 6.941 amu.

Let us assume the natural abundance of the 63Li be X  and the natural abundance for 73Li be (1-X)

6.41 = 6.0151X +  7.0160 (1-X)

x = 0.6053

1-x = 0.3985

Thus, the natural abundance of the  63Li is 60.53%  and the natural abundance of 73Li is 39.47 %.

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Answer:

I think it is Lithium...

Explanation:

Answer:

The sun is at the (edge) of our solar system

and is much (hotter) than anything else in the solar system (95%) of the entire mass of the solar system is contain in the sun

Answer:

down

Explanation:

The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).

An atom consists of electrons, protons, and neutrons. The protons and neutrons are present inside the nucleus of an atom whereas the electrons revolve around the nucleus of an atom.

The number of protons in an atom represents the atomic number of that particular atom. Further, this atomic number determines the place of each atom in the periodic table and its chemical properties.

For example, the mass number of sodium atom is 23 that is number of protons and neutrons. The atomic number of sodium is 11 that means there are 11 protons. The number of neutrons will be 23 - 11 = 12.

Sulfonamides and other drugs that inhibit folic acid synthesis have a high therapeutic index because they selectively target bacteria while having low toxicity to the host.

Let's understand this in detail:

1. The therapeutic index is defined as the ratio of the dose of a drug that causes toxic effects to the dose of a drug that produces the desired therapeutic effect. A high therapeutic index indicates that the drug is relatively safe, with a low risk of causing harm to the patient.

2. Antibiotics such as sulfonamides target bacterial cells while sparing the human host. Bacteria differ from human cells regarding their metabolic pathways and enzyme systems. Folic acid is an essential nutrient for DNA synthesis and cell division. Sulfonamides and other drugs that inhibit folic acid synthesis work by blocking the conversion of para-aminobenzoic acid (PABA) to folic acid. This results in the depletion of folic acid levels in bacteria, which cannot produce their folic acid. This eventually leads to the inhibition of bacterial growth and the death of the bacterial cells.

3. The selective toxicity of sulfonamides and other drugs inhibiting folic acid synthesis makes them effective against many bacterial infections. However, their effectiveness is limited to only those bacteria that are folic acid-dependent. They are not effective against bacteria that can synthesize their folic acid.

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Answer:

1.1 mol of O2

Explanation:

First we need the balance chemical equation which is

2 H2O2 -------> 2 H2O + O2

This is important because in stoichiometry you can go from units of one thing to other by using mole ratios, here the mole ratio is 2 mol of H2O2  for one mole of O2.

\(2.2 mol H2O2 \frac{1mol O2}{2 mol H2O2}\) = 1.1 mol of O2

Answer:

0.364 L

Explanation:

Para resolver este problema es necesario expresar la densidad en g/L.

Para hacer esa conversión primero convertimos m³ en L:

Y después convertimos kg en g:

Finalmente dividimos la masa deseada (400 g) entre la densidad, para calcular el volumen:

Answer:

According to the definitions given, atomic mass which is also called atomic weight is the measured total mass of an element's atom. Whereas, atomic number is nothing but the total number of neutrons and protons in the nucleus of an atom....

can u talk to in comment section

True. Do not use oil-based products such as Vaseline and body lotions because they destroy latex. Latex is a natural rubber, and when it comes into contact with oil-based products, it reacts chemically.

This reaction causes latex to degrade and lose its elasticity, making it prone to breakage. Therefore, it is important to avoid oil-based products when using latex products, such as condoms, gloves, and other medical supplies. Instead, use water-based products that are safe to use with latex. Water-based products are gentle on the skin and do not react chemically with latex, making them ideal for use with latex products.

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Answer:

All of the above

Explanation:

temperature, nature of solvent and solute, surface area , pressure ,  amount of stirring affect rate of dissolving.

the above answer will be liquid

The yield of the reaction may be less than 100%, so the actual mass of methyl butanoate produced may be lower.

The balanced chemical equation for the reaction is needed to determine the molar ratio between butanoic acid and methyl butanoate. However, assuming that the reaction is the esterification of butanoic acid with methanol to produce methyl butanoate and water, the balanced chemical equation is:

CH₃CH₂CH₂COOH + CH₃OH → CH₃CH₂CH₂COOCH₃ + H₂O

From the balanced equation, the stoichiometry is 1:1 between butanoic acid and methyl butanoate. This means that 52.5g of butanoic acid would produce 52.5g of methyl butanoate. However, because the reaction yield may be less than 100%, the actual mass about methyl butanoate produced may be lower.

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Chlorine (Cl) is a nonmetal, meaning it has the tendency to gain electrons to achieve the electron configuration of a noble gas. The noble gas electron configuration of the nearest noble gas, argon (Ar), is 1s2 2s2 2p6 3s2 3p6, with a total of 18 electrons.

Chlorine has 7 valence electrons, meaning it needs 1 more electron to achieve a stable noble gas electron configuration. Therefore, chlorine wants to gain 1 electron to achieve a stable noble gas configuration.

In terms of bonding, chlorine can either gain 1 electron to form an anion with a 1- charge or it can share electrons with another atom to form a covalent bond. Chlorine most commonly forms a single covalent bond with another atom, such as hydrogen, to form hydrogen chloride (HCl). In this case, both atoms share electrons to form a stable molecule.

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An element with three valence electrons has an effective nuclear charge of 2.

Eight elements make up the third period: silicon, phosphorus, magnesium, aluminum, silicon, sulfur, chlorine, and argon. The first two, sodium and magnesium, are found in the periodic table's s-block, while the remaining elements are found in the p-block.

The third period elements are also known as typical elements or representative elements since they accurately reflect the characteristics of their own group without any aberrations. Eight elements make up the third period, including sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, and argon.

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pCO2 is an important factor that affects various aspects of water chemistry and the impacts of ocean acidification. When pCO2 increases, the concentration of total CO2 dissolved in water also increases. This leads to changes in pH, which decreases due to increasing atmospheric CO2 concentration.

When pCO2 rises, the concentration of only CO2 dissolved in water increases. The dissolved CO2 forms carbonic acid, which contributes to the acidification of the ocean. This increase in CO2 affects the equilibrium between CO2, HCO3-, and CO3^2-, shifting it towards higher levels of dissolved CO2 and H+ ions, resulting in a lower pH.

In terms of the impacts of ocean acidification on different organisms, the effects can vary depending on their specific needs. An organism that requires CO2 is likely to fare better under ocean acidification since the increase in dissolved CO2 can provide them with a favorable environment. However, organisms that rely on HCO3- or CO3^2- may fare worse under ocean acidification, as the lower pH interferes with the availability of these carbonate ions, which are essential for shell formation and calcification in some marine organisms.

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Answer:

Explanation:

Well At 0 °C and 1 atm pressure (STP conditions), ideal gases have a molar volume of 22.4 Liters. When the molar volumes of NH3 and CH4 are measured at STP, the molar volume of NH3 is 22.1 L and the molar volume of CH4 is 22.4 L. ... NH3 molecules take up more volume than CH4 molecules.

Answer:

An example of heatwaves showing physical and chemical change is with a burning candle, when a candle burns, there is both a physical and chemical reaction.

The physical change is quite obvious and in fact, it can be seen. When the candle burns, the wax slowly melts and the candle gets smaller and smaller. This wax, as can be seen, will drip onto the candle and stick to it. When this wax forms back into a solid and stays on the candle, that is another physical change that can occur.

The chemical reaction can be a little less obvious. The first is that the heat produced by the candle consumes both the oxygen around it, as well as the fuels coming from the flame. This will then lead to carbon dioxide emissions produced by the flame, which by the way should never be inhaled. This is the chemical change that takes place in the reaction.

The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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d) the volume of 0.350 M NaOH required to neutralize the HCl produced when solvolysis of 1.00 mL of t-BuCl is 75% complete is 4.3 mL.

To calculate the quantities, we need to know the molar mass of t-BuCl, which is 92.57 g/mol.

(a) The number of moles of t-BuCl used can be calculated using the formula:

moles = volume (in liters) x concentration (in mol/L)

Given that the volume is 1.00 mL (which is equal to 0.001 L), and we have 2-chloro-2-methylpropane (t-BuCl), we can calculate the number of moles:

moles = 0.001 L x (2 mol/L) = 0.002 mol

Therefore, the number of moles of t-BuCl used is 0.002 mol.

(b) The complete solvolysis of 1.00 mL of t-BuCl produces 1 mole of HCl since t-BuCl undergoes a one-to-one reaction with HCl. Therefore, the number of moles of HCl produced is also 0.002 mol.

(c) To calculate the volume of 0.350 M NaOH required to neutralize the HCl, we can use the mole ratio between HCl and NaOH. The balanced equation for the neutralization reaction is:

HCl + NaOH -> NaCl + H₂O

The mole ratio between HCl and NaOH is 1:1. Therefore, the number of moles of NaOH required is also 0.002 mol.

We can use the formula:

volume (in liters) = moles / concentration (in mol/L)

volume = 0.002 mol / 0.350 mol/L = 0.0057 L

Converting this to milliliters:

volume = 0.0057 L x 1000 mL/L = 5.7 mL

Therefore, the volume of 0.350 M NaOH required to neutralize the HCl produced by complete solvolysis of 1.00 mL of t-BuCl is 5.7 mL.

(d) If solvolysis of 1.00 mL of t-BuCl is 75% complete, it means that only 75% of the t-BuCl has reacted to form HCl. Therefore, the amount of HCl produced would be 75% of 0.002 mol.

mol of HCl produced = 0.75 x 0.002 mol = 0.0015 mol

Using the same mole ratio of 1:1 between HCl and NaOH, we can calculate the volume of 0.350 M NaOH required:

volume = 0.0015 mol / 0.350 mol/L = 0.0043 L

Converting this to milliliters:

volume = 0.0043 L x 1000 mL/L = 4.3 mL

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The correct answer is: C) fluorescence. The physical process where a chemical absorbs light at one wavelength and emits it at a specific and longer wavelength is called fluorescence.

Fluorescence occurs when a molecule absorbs photons of higher energy (shorter wavelength) and undergoes an electronic transition to an excited state. This excited state is typically unstable, and the molecule subsequently releases the excess energy in the form of emitted photons with longer wavelength (lower energy). The emitted photons in fluorescence have a characteristic and longer wavelength, resulting in a distinct color or fluorescence emission spectrum for different substances.

This property is widely utilized in various scientific and technological applications, including imaging techniques, chemical analysis, biological assays, and fluorescent labeling.

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The acyl substituent effect in an electrophilic aromatic substitution reaction is deactivating and meta-directing. Therefore, the correct option is (D) deactivating and meta-directing.

An electrophilic aromatic substitution (EAS) reaction is a type of organic reaction that involves the substitution of an aromatic hydrogen atom with an electrophile.

The electrophile attacks the aromatic ring, forming a positively charged intermediate, which is then stabilized by a nearby electron-donating group (if present) or a neighboring double bond. This type of reaction is commonly used in the synthesis of a variety of organic compounds, including pharmaceuticals, dyes, and polymers

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The balanced equation for the nonproductive reaction when lysine is the substrate.

                  H⁺ + NADPH + O₂ ======> NADPH⁺ + H₂O₂

Lysine is an natural complement used for athletic overall performance enhancement, or remedy for cold sores and expanded pH . Lysine is probably effective for bloodless sores remedy.

Lysine, is an critical amino acid, which means it is vital for human health, however the body can not make it. you need to get lysine from food or supplements. Amino acids like lysine are the building blocks of protein. Lysine supplements is very secure and does not seem to motive many side outcomes. the majority can take a each day dose of up to a few grams of lysine without any side consequences.

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Answer: a neutral

Explanation: it’s an neutral because it’s all alone and there’s no chemicals

The element with the lowest melting point is Ga.
Hence, Option (C) is correct answer.

Melting point is usually defined as the temperature at which solid changes to liquid.

The melting point order of B, Al, Ga, Tl is B > Al> Tl > Ga due to structural changes, melting point increases from Ga to Tl. Hence Ga has the lowest melting point among all these.

Thus from the above conclusion we can say that The element with the lowest melting point is Ga.
Hence, Option (C) is correct answer.

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Answer:

flashcards, if its the periodic table write out the elements in order

just read the material over and over again

Explanation:

The type of bond that results from the side-on overlap of orbitals is a pi (π) bond.

In chemical bonding, the side-on overlap of orbitals occurs when parallel p orbitals align and share electron density. This type of overlap is characteristic of pi (π) bonding.

Pi (π) bonds are formed in addition to sigma (σ) bonds, which result from the head-on overlap of orbitals. Unlike sigma bonds that allow rotation, pi bonds are formed by the sideways overlap of p orbitals and restrict rotation around the bond axis.

Pi bonds are commonly observed in molecules with double or triple bonds, such as alkenes and alkynes. The additional overlap of p orbitals in these molecules creates the pi-bonding framework, which adds strength and stability to the overall molecular structure.

It is important to note that ionic bonds involve the complete transfer of electrons between atoms, while hydrogen bonds are weaker electrostatic attractions between a hydrogen atom and an electronegative atom. Neither of these bond types are directly associated with the side-on overlap of orbitals.

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Answer:

cohesion

Explanation:

because because cohesion is the state where particles are closer to eacch other hence tthe. paarticles being closer resul to. a floating objct like a razoor too experience surface tension.

note

thi condition ccaan only be remove by a ssurrfacctaant