even though ca(oh)2 is an inexpensive base, its limited solubility restricts its use. what is the ph of a saturated solution of ca(oh)2?

Answer:

Examples of calcium channel blockers include:

Amlodipine (Norvasc)

Diltiazem (Cardizem, Tiazac, others)

Felodipine.

Isradipine.

Nicardipine.

Nifedipine (Procardia)

Nisoldipine (Sular)

Verapamil (Calan SR, Verelan)

4.2228 g of solid potassium sulfide should be added to make an aqueous solution of 0.180 M potassium sulfide for an experiment in lab, using a 300 ml volumetric flask.

The given molarity of the aqueous solution of potassium sulfide is 0.180 M and the volume of the solution is 300 mL. We are required to find out the amount of solid potassium sulfide required to make the solution.

The formula to calculate the number of moles is: Number of moles = Molarity x Volume (in liters) 1. Convert the volume into liters.300 mL = 0.3 L2. Substitute the given values in the above formula.Number of moles = 0.180 M x 0.3 LNumber of moles = 0.054 mol3. The molecular formula of potassium sulfide is K2S. It means there are two moles of K for one mole of K2S. Hence, we can calculate the moles of K.Number of moles of K = 2 x 0.054

Number of moles of K = 0.108 mol4. The molar mass of K is 39.1 g/mol. Hence, we can calculate the mass of K required to make 0.108 mol.Number of grams of K = Number of moles x Molar massNumber of grams of K = 0.108 mol x 39.1 g/mol

Number of grams of K = 4.2228 g. Hence, 4.2228 g of solid potassium sulfide should be added to make an aqueous solution of 0.180 M potassium sulfide for an experiment in lab, using a 300 ml volumetric flask.

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The nucleus more easily, increasing the probability of causing fission many nuclei like U234, U236, and U238 undergo fission only by fast neutrons.

Fission can be caused by slow as well as fast neutrons. It is the energy of the neutron which determines its effectiveness in causing fission. Fast neutrons are more effective in causing fission. Hence, many nuclei like U234, U236, and U238 undergo fission only by fast neutrons.

Fission is a nuclear reaction process in which the nucleus of an atom is split into two smaller nuclei with the release of a large amount of energy and two or three neutrons. Uranium-235 (U-235) and Plutonium-239 (Pu-239) are the most commonly used fissile materials, but other materials like U-234, U-236, and U-238 can also undergo fission. When a neutron is absorbed by the nucleus of a fissile material like U-235 or Pu-239, it becomes unstable and splits into two smaller nuclei with the release of a large amount of energy.

The fission process also releases two or three neutrons, which can cause further fission of other nuclei, leading to a chain reaction. The chain reaction can be controlled by using a neutron moderator, which slows down the fast neutrons, making them more effective in causing fission. The efficiency of the fission reaction depends on the energy of the neutron.

Fast neutrons are more effective in causing fission than slow neutrons, which have less energy. This is because fast neutrons can penetrate the nucleus more easily, increasing the probability of causing fission. Hence, many nuclei like U234, U236, and U238 undergo fission only by fast neutrons.

Fast neutrons are more effective in causing fission than slow neutrons, which have less energy.

This is because fast neutrons can penetrate the nucleus more easily, increasing the probability of causing fission. Hence, many nuclei like U234, U236, and U238 undergo fission only by fast neutrons.

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Answer:

A and C

Explanation:

I just took the quiz

The factors affect the amount of thermal energy an object has:

Factors that affect the amount of energy are:

A measure of the kinetic energy of the particles that make up a material. The movement of heat energy from a warm object to a cool object. Transmission of thermal energy from one object to another by electric waves. Transmission of thermal energy between objects by particle collisions.

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Answer:

Optical Atomic Spectroscopy

Explanation:

...

The kind of spectra used to measure the atomic number of elements is X-ray spectra.

The atomic number of elements is the number of protons in the nucleus of the element. According to the modern periodic law, the properties of elements is a periodic function of their atomic numbers.

In 1913, Mosely demonstrated that the atomic number of elements can be obtained from the X-ray spectra of elements. Using this method, he arranged the elements in order of increasing atomic number.

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The complete table:
Element | Mole | Mass:
Cr | 0.00432 | 0.210 g
Fe | 0.00156 | 87.0 mg
Ti | 1.175×10−3 | 0.0599 g
Hg | 0.00769 | 1.54 Kg

For each element ; Mass = Moles × Molar Mass

1. To find the mass of Cr, use the molar mass of Cr (51.996 g/mol):
  Mass = Moles × Molar Mass
  Mass = 0.00432 mol × 51.996 g/mol = 0.210 g

2. To find the moles of Fe, use the molar mass of Fe (55.845 g/mol):
  Moles = Mass ÷ Molar Mass
  Moles = 87.0 mg × (1 g/1000 mg) ÷ 55.845 g/mol = 0.00156 mol

3. To find the mass of Ti, use the molar mass of Ti (47.867 g/mol):
  Mass = Moles × Molar Mass
  Mass = 1.175×10−3 mol × 47.867 g/mol = 0.0599 g

4. To find the moles of Hg, use the molar mass of Hg (200.592 g/mol):
  Moles = Mass ÷ Molar Mass
  Moles = 1.54 Kg × (1000 g/1 kg) ÷ 200.592 g/mol = 0.00769 mol

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The frequency of the wave is found to be 7.05×10¹⁴hertz.

The relation between speed of light, frequency and wavelength is given by,

C= fλ

f=c/λ

f= 3×10⁸/425×10⁻⁹

f=7.05×10¹⁴.

Thus, the frequency of the wave is found to be 7.05×10¹⁴ hertz.

The number of waves that pass a specific place in a given period of time is known as the wave frequency. The hertz (Hz) is the SI unit for wave frequency, and 1 hertz is equivalent to 1 wave crossing a fixed point in 1 second. A wave with a higher frequency has more energy than a wave with a lower frequency of the same amplitude.

A wave’s wavelength is the separation between two adjacent waves’ corresponding points. The Greek letter lambda () is typically used to represent a wave’s length. Wavelength is defined as the product of a wave train’s frequency (f) and speed (v) in a medium.

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Answer:

distance-155

displacement-65

Explanation:

this is what i got and it may be wrong

To solve this we must be knowing each and every concept related to displacement and distance. Therefore, the distance and displacement of the family are 110 km and 65Km respectively.

The separation between two places of an item in motion is known as displacement. Therefore, it relies on both the starting position and the ending position. Displacement is also the shortest distance between the initial and ultimate places.

The meter is used as the calculation's standard unit since it measures distance (m). Displacement is an important notion in many applications in physics. The distinction between two locations of an object is known as displacement. Because it has both a direction and magnitude, it qualifies as a vector quantity.

distance=110 km

displacement=  110 km- 45 km

                      =65Km

Therefore, the distance and displacement of the family are 110 km and 65Km respectively.

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Rust is known as Iron (III) Oxide according to the IUPAC, and its chemical formula is Fe2O3.

Iron rusting is a chemical change since it involves the interaction of two substances to create a new one. Iron oxide is created during the rusting process by the reaction of iron and oxygen molecules.

Rust is described as the reddish brown layer that frequently develops on particular kinds of metal. These metals rust when they are exposed to air and moisture. The red material is created as a result of this combination's chemical reaction.

Rust's scientific name is iron oxide; its chemical formula is \($${Fe_2O_3}\). Metals that rust are those made of iron or iron alloys like steel. A chemical reaction takes place over time when iron comes into touch with airborne oxygen and water. This reaction creates iron oxide as a new chemical. The reddish hue of Mars is due to the abundance of iron oxide, which is present in nature and also on Mars.

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Each compound have consisted of one type of molecule. Thus, option B is correct.

Compounds have been the chemical moiety that has been consisted of the number of molecules.

The molecules have consisted of varying atoms in the fixed proportion formed by the intermolecular interactions. The identical molecules club together with the intramolecular interactions and result in the compound.

Examples of compounds have been sugar, water, carbon dioxide, table salt, etc.

Thus, each compound have consisted of one type of molecule. Thus, option B is correct.

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To calculate the number of grams of O2 produced in 15 minutes, we need to find the ratio of CO2 produced to O2 consumed. The molar ratio of CO2 to O2 is 1:1, meaning that for every gram of CO2 produced, one gram of O2 is consumed.

Given that the person exhales 0.65g of CO2 every minute, we can assume that the person consumes 0.65g of O2 as well. Therefore, in 15 minutes, the person will exhale (0.65g/min) x (15 min) = 9.75 grams of CO2. Since the molar ratio of CO2 to O2 is 1:1, we can conclude that the person would also consume 9.75 grams of O2 in the same timeframe.
By assuming a molar ratio of 1:1 between CO2 and O2, we can calculate the number of grams of O2 produced in 15 minutes when a person exhales 0.65g of CO2 every minute.

Multiplying the CO2 production rate by the number of minutes gives us 0.65g/min x 15 min = 9.75 grams of CO2 produced in 15 minutes. As the molar ratio between CO2 and O2 is 1:1, this also means that 9.75 grams of O2 would be consumed in the same time period. This calculation assumes that the person is exclusively exhaling CO2 and consuming O2 at a constant rate without any other factors affecting the gas exchange process. It's important to note that this is a simplified calculation and real-world physiological processes may involve more variables.

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Answer: 1

Explanation:

GGCCATAGGTCCCTTTAGCG

I believe this is correct (I used the complementary base)

Answer:

Carbon, hydrogen, nitrogen, oxygen, phosphorus,or potassium as nutrients for plants.

Explanation:

mark me as brainliest if it helped you

Carbohydrates or starch serve as nutrients for plants.

Answer:

Distance

Explanation:

The distance between the beginning of the first P wave and the first S wave tells you how many seconds the waves are apart. This number will be used to tell you how far your seismograph is from the epicenter of the earthquake. Measure the distance between the first P wave and the first S wave.

The 100g solution of mannitol has 549.45 millimoles.

Mannitol (C₆H₈(OH)₆) is used in pharmaceutical goods as a sweetener, tablet and capsule diluent, excipient for chewable tablets, tonicity agent, and vehicle (bulking agent) for lyophilized preparations. It is used as a drug to lower elevated intracranial pressure and lower ocular pressure, as in glaucoma.

The molecular weight of mannitol = 182g.

Mass of mannitol given = 100g.

∴ Moles per liter of mannitol = \(\frac{Mass of mannitol}{Molecular weight of mannitol}\)

                                                  \(=\frac{100}{182}\)

                                                  = 0.54945 moles

Now,

1 mole = 1000 millimoles

∴ 0.54945 moles of mannitol = \(\frac{0.54945 }{1000}\)

                                                = 549.45 millimoles

Hence, the 100g solution of mannitol has 549.45 millimoles.

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Answer:

subscript is 3

Explanation:

the  subscript is the number that is slightly lower than a # which in this case it's O

this indicates that there's 3 oxygen atoms

Answer:

the answer is 1 ‍♀️

Explanation:

Striking a match is an example of providing activation energy to a chemical reaction (option D).

A chemical reaction is a process involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.

Lighting a match is an example of chemical reaction because it involves the interaction of potassium chlorate from the match-tip and the red phosphorus (phosphorus sulfide) on the match box strip.

Upon striking the surface of this strip to create a flame and generate heat, the chemical reaction persists. Hence, striking the match stick is like an activation energy for the reaction to occur.

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Answer:

3.5m/s²

Explanation:

Logic...

Answer:

b.2

Explanation:

the two are joining the atoms

Answer:

Explanation:

we know that ideal gas equation is

PV=nRT

P=nRT/V

V=10.3L

n=10.67

T=21.2+273=294

R=0.0821

P=10.67*0.0821*294/10.3

P=25.00atm

Answer:

P = 25.0 atm

Explanation:

Given data:

Volume of gas = 10.3 L

Number of moles of Cl₂ = 10.67 mol

Temperature = 21.2 °C

Pressure of gas = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

21.2+273 = 294.2 K

10.3 L × P = 10.67 mol ×  0.0821 atm.L/ mol.K  × 294.2 K

P = 257.72 atm.L /  10.3 L

P = 25.0 atm

Answer:

the answer is B  Equals i just took the test

wassup baby tryna add me on snap

Explanation:

like fr add me on snap

Answer:

31.64...

Explanation:

The formula is volume is equal to mass over density.

So 25/0.79=31.64...

The volume of ethyl alcohol is 31.645mL.

Volume is the amount of space the matter occupies.

Ethyl alcohol is a clear, colourless liquid and the main ingredient in alcoholic beverages.

Density = mass/volume

D = m/v

v x D = m

On multiply both sides by D,

 v x D/D = m/D

            v = m/D

               = 25g/0.79g/mL

               = 31.645mL

Hence, the volume of ethyl alcohol is 31.645mL.

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Answer:

6

Explanation:

bromine has 1, hydrogen has 4 and nitrogen has 1 therefore equaling 6

The number of atoms in NH₄Br is six.

An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is surrounded by one or more negatively charged electrons. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.

Atoms are the basic building blocks of matter. Anything that takes up space and anything with mass is made up of atoms.

In the given formula, there is one N atom, four H atoms and one Br atom making a total of six atoms.

Therefore, the number of atoms in NH₄Br is six.

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Answer:

Sublimation.

Explanation:

Sublimation is the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage

U has a total of six electrons. This corresponds to carbon (C). A is the second most common element in the atmosphere.

The second most common element in the atmosphere is oxygen (O). E is a noble gas.

Noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). Based on the given options, E could be xenon (Xe).

S is an alkali metal.

Alkali metals include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). Based on the given options, S could be sodium (Na).

O is a halogen.

Halogens include fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). Based on the given options, O could be bromine (Br).

O has an atomic number larger than V but smaller than W.

Based on the periodic table, the atomic number of oxygen (O) is 8, which is larger than the atomic number of vanadium (V) (23) and smaller than the atomic number of tungsten (W) (74).

The charge on an L ion is +2.

The charge of +2 indicates that L must lose two electrons to form the ion. Based on the given options, L could be calcium (Ca).

C has five electrons in its outer energy fever.

Carbon (C) has four valence electrons, not five. This contradicts the given statement, so we need to revisit the deductions.

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Answer:

hi-

Explanation:

interaction with acetylcholine?

Aspartic acid 311

10) What amino acid in the binding site of the cholinergic receptor is involved in an ionic interaction with acetylcholine? Feedback: Aspartic acid 311 is ionised and is present in the binding site as a negatively charged aspartate ion.