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What does it mean that the filtered water samples reacted with phenolphthalein?

Answer:

23

Explanation:

Answer:

0.118m

Explanation:

Answer:

(b) BeF2 > OF2 > CH3OH

Explanation:

The degree and type of intermolecular forces present in a substance influences its vapour pressure considerably. The greater the magnitude and strength of intermolecular forces in the substance, the lower the vapour pressure of the substance.

BeF2 molecules are held together by weak vanderwaals forces hence BeF2 will exhibit the least degree of intermolecular interaction and have the highest vapour pressure. OF2 molecules are bound together by dipole interactions hence it will exhibit a lower vapour pressure compared to BeF2. CH3OH molecules form hydrogen bonds with water molecules hence it will exhibit the least vapour pressure among the trio.

Answer:

Hey mate...

Explanation:

This is ur answer.....

This is because fluorine atoms are the smallest of the halogens—the atoms are bonded close together, which leads to repulsion between free electrons in the two fluorine atoms.

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1) List the known and unknown quantities.

Volume: 208,000 gallons.

Density: 1.00 g/mL.

2) Convert gallons to liters.

3.7854 L = 1 gal.

3) Convert g/mL to pound/L

1 pound = 453.59 g

1000 mL = 1 L

4) Mass of water in kg.

5) Convert pounds to tons.

1 ton = 2000 pounds

The conversion factors needed are those in option D.

.

Answer:

Carbohydrates

Hope this helps:)

Balancing the equation :

KOH(aq) + HBr(aq) --> KBr(aq) + H2O(l)

This is the balanced chemical reaction because it follows the following ionic reaction:

H ^(aq)+ + Br^(aq)- + K^+(aq) + OH ^- (aq) → K^+(aq) + Br^-(aq) + H2O (l)

The reaction that is occurring in this question is:

H2 + I2 -> 2 HI

As we can see, the molar ratio for H2 and I2 is 1:1, one mole of H2 for each mole of I2, and the molar ratio between any reactant and HI is 1:2, which means the number of moles of product will be two times more than the number of moles of the reactants

We have:

3.0 moles of H2

2.0 moles of I2

1.0 moles of HI

According to the molar ratio, we should have the name number of moles of I2 and H2, which means that H2 is in excess and I2 is the limiting reactant with 2 moles

If we have 2 moles of I2, and the molar ratio of I2 and HI is 1:2, we should have 4 moles of HI being produced

Therefore the theoretical number of moles is 4.0 moles of HI from 2.0 moles of I2

The evidence in the table for each of the following atoms of an element A, B, and C is that   A,B, and C are all particles of the same element; option ii.

Elements are substances that are composed entirely of the same atoms and which cannot be split into simpler units by an ordinary chemical process.

Atoms of the same element have the same number of protons or the same atomic number.

However, atoms of the same element may have different numbers of neutrons, and these atoms of the element are called isotopes.

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Answer:

Which has the longest wavelength?

✔ microwaves

x infrared

x visible

x X-rays

Which has the highest frequency?

✔ X-rays

x infrared

x microwaves

x visible

Explanation:

I apologize if this was a late answer or if this doesn't answer your original question, but hope this helps! :)

Answer:

Microwaves then X rays

Explanation:

Ionic and covalent bonds are two types of chemical bonds. An ionic bond is formed between a metal and a nonmetal, while a covalent bond is formed between two nonmetals. Most Ionic: Sr-Br > Na-Br > P-Br > Cl-Br > Br-Br. Most Covalent: Br-Br > Cl-Br > P-Br > Na-Br > Sr-Br

The degree of ionic or covalent character in a bond depends on the electronegativity difference between the atoms that form the bond. The electronegativity difference between the atoms in a bond is a measure of how strongly each atom attracts the shared electrons.

The greater the electronegativity difference, the more ionic the bond will be, and the smaller the electronegativity difference, the more covalent the bond will be.

Using the electronegativity values of the atoms involved, we can rank the bonds from most ionic to most covalent as follows: Most Ionic: Sr-Br > Na-Br > P-Br > Cl-Br > Br-Br. Most Covalent: Br-Br > Cl-Br > P-Br > Na-Br > Sr-Br

Sr-Br and Na-Br are both ionic bonds, with Sr being a more electropositive metal than Na, resulting in a greater electronegativity difference and a more ionic bond. P-Br and Cl-Br are both polar covalent bonds, with Cl being more electronegative than P, resulting in a greater electronegativity difference and a more polar bond.

Finally, Br-Br is a nonpolar covalent bond with no electronegativity difference between the two Br atoms. Overall, the trend in bond character goes from most ionic with the largest electronegativity difference to most covalent with the smallest electronegativity difference.

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Answer:

B wind blowing away sediment

Explanation:

Erosion is the process whereby soil, nutrients, particles are transported away from one place to another via agents like water and wind. Generally, erosion exercises its effect on the surface of the soil.

Since erosion can occur as a result of action of water or wind on the surface of the Earth, "wind blowing away sediment" is an example of erosion among the other options listed in the question.

Answer:

Explanation:

Reduction potential of Copper metal is .34 V and reduction potential of Calcium is - 2.87 V . So copper will not be able to reduce Calcium chloride to calcium . Hence no reaction will take place when a piece of copper metal is placed in calcium chloride solution .

The statement that is always true is d. One mole of oxygen atoms has the same number of electrons as one mole of calcium atoms.

In a neutral atom, the number of electrons is equal to the number of protons. Since both oxygen and calcium atoms have the same number of protons (8 and 20, respectively), one mole of oxygen atoms will always have the same number of electrons as one mole of calcium atoms.

Option a is not always true because the mass of one mole of carbon atoms (12 g) is different from the mass of one mole of oxygen atoms (16 g).

Option b is not always true because the Avogadro's number (6.022 × 10^23) represents the number of atoms or molecules in one mole of a substance, so the number of atoms in one mole of aluminum (atomic number 13) will be different from the number of atoms in one mole of sodium (atomic number 11).

Option c is not always true because the number of protons in one mole of iron atoms (atomic number 26) is different from the number of protons in one mole of carbon atoms (atomic number 6).

Option e is not always true because density depends on the mass and volume of a substance, and the densities of fluorine and nitrogen atoms will vary based on their atomic masses and atomic radii.

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Structural members' total stresses must be optimized to ensure that they do not exceed their load-bearing capacity and that the structure remains stable and intact. This is why it is important to consider the total stresses within structural members when designing a structure.

For a structure to remain intact, the total stresses within structural members must be balanced by the strength of the materials used and the geometry of the structure itself. The total stresses within structural members must be carefully calculated and controlled to prevent failure or collapse of the structure.The stress that structural members are subjected to is influenced by the weight of the structure itself and any loads that are applied to it, such as wind, water, or seismic forces. A structure's load-bearing capacity can be increased by changing its geometry or by using stronger materials. Structural members' total stresses must be optimized to ensure that they do not exceed their load-bearing capacity and that the structure remains stable and intact. This is why it is important to consider the total stresses within structural members when designing a structure.

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Answer: The heat flows into Earth's atmosphere which changes as the Sun rises and sets, which increases during the day.

Explanation:

Neither of the given mixtures has a pH closest to 7.In fact, both mixtures will result in basic solutions. To obtain a solution with a pH closest to 7, we would need to mix an acidic and basic solution in appropriate proportions to neutralize each other's pH.

To determine which of the given mixtures has a pH closest to 7, we need to examine the acid-base properties of the individual components and their corresponding conjugate bases and acids.

HClO is a weak acid that partially dissociates into H+ and ClO-. NaClO is the conjugate base of HClO, which will hydrolyze in water to produce OH- ions. The resulting solution will be basic, with a pH greater than 7.

HNO2 is a weak acid that partially dissociates into H+ and NO2-. NaNO2 is the conjugate base of HNO2, which will hydrolyze in water to produce OH- ions. The resulting solution will be basic, with a pH greater than 7.

Therefore, neither of the given mixtures has a pH closest to 7. In fact, both mixtures will result in basic solutions. To obtain a solution with a pH closest to 7, we would need to mix an acidic and basic solution in appropriate proportions to neutralize each other's pH.

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Answer:

2 vials

Explanation:

The concentration (C) of the drug in the solution is:

C= 500 mg/5 mL = 100 mg/mL

Each vial with a volume (V) of 10 mL, contains the following mass of drug:

V= 10 mL ⇒ C x V = 100 mg/mL x 10 mL = 1000 mg

As you need 2.00 g, and 1 gram is equivalent to 1000 mg, the mass needed is 2.00 g x 1000 mg/1 g = 2000 mg

Thus, you have to divide the mass you need into the mass of each vial:

(2000 mg)/(1000 mg/vial) = 2 vials

Therefore, you need 2 vials.

The data can show us that X ,Y and Z are all esters

The law of definite proportions, also known as Proust's Law, states that a given chemical compound always contains the same elements in the same proportion by mass.

This means that no matter how a compound is obtained or prepared, its elemental composition will always be the same. For example, water is always composed of hydrogen and oxygen in a ratio of 2:1, regardless of its source or method of preparation.

The law of definite proportions is a fundamental principle of chemistry and provides evidence for the atomic theory of matter.

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Answer:

you melt it

Explanation:

You change a solid to a liquid by melting it.

for example ice becomes a liquid by melting.

Answer:

Heat is probably the easiest energy you can use to change your physical state. The atoms in a liquid have more energy than the atoms in a solid. There is a special temperature for every substance called the melting point. When a solid reaches the temperature of its melting point, it can become a liquid.

Explanation:

Answer: Japenease pls

Explanation:

The organic compound, carboxylic acid will be found in ethyl acetate.

Organic compounds are those compounds that are obtained naturally from living matter.

Organic compounds are mostly composed of carbon, hydrogen, and oxygen.

Organic compounds are generally covalent compounds. Hence, they are usually non-polar compounds.

Based on the principle of like dissolves like, organic compounds are usually soluble in non-polar organic solvents and insoluble in polar inorganic solvents like water.

Carboxylic acid is an organic compound.

Ethyl acetate is an organic compound.

Aqueous NaHCO₃ is an inorganic compound.

Hence, carboxylic acid will dissolve in Ethyl acetate.

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Answer:

b. a meadow replacing a pond in it's flood plain

Explanation:

I'ts a secondary succession.

By the use of the Boyle's law as we can see in the solution below, the pressure is  51.5 units.

Boyle's law is a principle in physics that describes the relationship between the pressure and volume of a gas at a constant temperature.

It states that the pressure of a gas is inversely proportional to its volume, meaning that if the volume of a gas is decreased, the pressure will increase proportionally, and if the volume is increased, the pressure will decrease proportionally.

Using the Boyles law;

P1V1 = P2V2

P2 = P1V1/V2

P2 = 12.8 * 40.2/10

P2 = 51.5

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B. methylcyclopentane

F. propane

G. n-pentane are the following molecules would a flame ionization detector (FID) be sensitive to after separation on a gas chromatography column.

flame ionization detector(FID) The most used detector in gas chromatography is the flame ionization detector . Since practically all organic molecules include carbon atoms (C), the FID is sensitive to and capable of identifying them. As nitrogen, the primary component of air, won't burn under these circumstances, and chromatography the technology is also insensitive to moisture and carbon dioxide, hydrocarbons in the environment can be found using flame ionization detector (FID).

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Answer:

–99 °C

Explanation:

From the question given above, the following data were obtained:

Initial pressure (P₁) = 1.5 atm

Initial temperature (T₁) = 25 °C

Final pressure (P₂) = 1 atm

Change in temperature (ΔT) =?

Next, we shall determine the final temperature. This can be obtained as follow:

Initial pressure (P₁) = 1.5 atm

Initial temperature (T₁) = 25 °C + 273 = 298 K

Final pressure (P₂) = 1 atm

Final temperature (T₂) =?

P₁/T₁ = P₂/T₂

1.5 / 298 = 1 / T₂

Cross multiply

1.5 × T₂ = 298

Divide both side by 1.5

T₂ = 298 / 1.5

T₂ = 199 K

Converting 199 K to °C, we have:

T(°C) = T(K) – 273

T₂ = 199 – 173

T₂ = –74 °C

Finally, we shall determine change in temperature. This can be obtained:

Initial temperature (T₁) = 25 °C

Final temperature (T₂) = –74 °C

Change in temperature (ΔT) =?

ΔT = T₂ – T₁

ΔT = –74 – 25

ΔT = –99 °C

Thus, the change in the temperature is –99 °C

Answer:

Option C. By increasing the temperature

Explanation:

From the graphical illustration above, we see clearly that the volume and temperature of the gas are directly proportional. This implies that as the temperature increases, the volume will also increase and as the temperature decreases, the volume will also decrease. This can further be explained by using the ideal gas equation as shown below:

PV = nRT

P is the pressure.

V is the volume.

n is the number of mole.

R is the gas constant.

T is the temperature.

PV = nRT

Divide both side by P

V = nRT/P

Since n and P are constant, the equation above becomes:

V & T

V = KT

K is the constant.

The above equation i.e V = KT implies that:

As T increases, V will also increase and as T decreases, V will also decrease.

Considering the question given above,

The volume of the gas can be increased if the temperature is increased.

While one action potential can trigger some glutamate release, it is not sufficient to induce LTP.

An action potential is the electrical impulse that travels down a neuron and triggers the release of neurotransmitters, such as glutamate, at the synapse. The amount of glutamate released depends on various factors, such as the number of vesicles containing glutamate, the number of active zones on the presynaptic membrane, and the strength of the synapse.

However, in general, one action potential may not be enough to trigger enough glutamate release to induce long-term potentiation (LTP), which is a persistent strengthening of the synapse that underlies learning and memory. LTP requires sustained and repetitive stimulation of the synapse, often referred to as high-frequency stimulation (HFS), which can induce a series of action potentials that lead to a massive release of glutamate and activation of postsynaptic receptors. This can trigger various intracellular signaling pathways that enhance synaptic efficacy and produce lasting changes in the strength of the synapse.

Therefore, while one action potential can trigger some glutamate release, it is not sufficient to induce LTP.

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