What mineral is harder, Calcite or Olivine?

When preparing a dilute solution from a more concentrated one, be sure to carry out the necessary calculations before getting started with any glassware. This is important to ensure that the resulting solution has the desired concentration and accuracy.

Use a pipette to transfer an aliquot (a measured portion) of the concentrated solution into a clean, dry volumetric flask. The pipette should be chosen based on the amount of solution needed, and should be calibrated to ensure accuracy.

Add a small amount of solvent (the diluent) to the flask, and swirl it gently to dissolve the solute (the substance being dissolved). Then, fill the flask to the calibration mark with solvent, using a dropper or funnel to avoid spillage.

Mix the solution thoroughly by swirling or inverting the flask, being careful not to introduce any air bubbles. Label the flask with the identity and concentration of the solution, and any other relevant information such as the date and preparer's name.

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Answer: 22400

Explanation:

Answer:

quartz (SiO2)n

Explanation:

Melting point is defined as the temperature or point at which the substances change its state from solid to liquid.

Quartz (SiO2)n has high melting point than O2 because Quartz (SiO2)n is found in the form of hard, crystalline mineral that is made up of silicon and oxygen atoms having strong covalent bonds between all the atoms. So, a lot of energy is required to break the bond between the atoms and it has a high melting point.

Hence, the correct answer is quartz (SiO2)n.

Answer:

6

Explanation:

The atomic number for phosphorous is 15, meaning that it has 15 electrons (and protons). The first and second shells would be filled up with 2 and 8 electrons respectively, leaving 5 which goes on the third shell, which is also the valence shell, meaning phosphorous has 5 valence electrons.

Since the atomic number of sulfur is 16, the first and second shells are also filled up with 2 and 8 electrons respectively, leaving 6 to be on the third shell, the valence shell. Hence, sulfur has 6 valence electrons.

(i) Tritium (3H) undergoes radioactive decay to produce helium-3 (3He) with a half-life of 12.32 years.

Using the radioactive decay law, we can calculate the amount of 3H that will decay into 3He over the given period:

t1/2 = 12.32 years

t = 1.5 years (from July 1, 1998, to Jan 1, 2000)

λ = ln(2) / t1/2 = 0.0562 year^-1

N(t) = N0 * e^(-λt)

where N(t) is the number of atoms at time t, N0 is the initial number of atoms, and e is the mathematical constant approximately equal to 2.718.

Plugging in the given values, we get:

N(1.5 years) = 10 Ci * (3.7 * 10^10 disintegrations/s/Ci) * (1 - e^(-λt)) = 2.76 * 10^19 atoms

To convert this into grams, we need to know the molar mass of 3He, which is 3.016 g/mol. Therefore, the mass of 3He produced will be:

m = N * M = 2.76 * 10^19 atoms * (3.016 g/mol / 6.022 * 10^23 atoms/mol) = 0.138 g

Therefore, on Jan 1, 2000, there will be 2.76 * 10^19 atoms of 3He and 0.138 grams of 3He.

(ii) To calculate the remaining amount of 3H, we can use the fact that the initial amount of 3H was 10 Ci, and we have already calculated the amount of 3H that has decayed into 3He. Therefore, the remaining amount of 3H is:

10 Ci - 2.76 Ci = 7.24 Ci

To convert this into grams, we can use the conversion factor:

1 Ci = 3.7 * 10^10 disintegrations/s

Therefore,

7.24 Ci * (3.7 * 10^10 disintegrations/s/Ci) * (1 mol/6.022 * 10^23 atoms) * (3.016 g/mol) = 0.015 g

Therefore, on Jan 1, 2000, there will be 0.015 grams of 3H remaining.

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Answer:

Because mass and volume are independent, two objects with the same volume can have different masses. Therefore, the objects can have different densities. However, if two objects have the same mass and volume, they will have the same density. density=mass/volume.

Explanation:

Answer:

ver explicacion

Explanation:

Los iones se forman cuando las especies químicas pierden o ganan electrones.

Las sustancias iónicas consisten en un ión positivo y negativo cuyas cargas se equilibran exactamente entre sí, por lo que el compuesto iónico es neutro.

Los átomos de metal se mantienen unidos por el enlace metálico. Esto implica la interacción entre iones metálicos cargados positivamente y un mar de electrones negativos. Las cargas positivas de los iones metálicos están exactamente equilibradas por el mar de electrones cargados negativamente, por lo que el metal es neutro.

Answer:

N3-

Explanation:

According to the mentioned experimental procedure, an enzyme solution of alkaline phosphatase in 50 mM Tris-HCl buffer at a particular pH is used to measure the organophosphate content in the horn sample.

The pH of the buffer is altered to maximize enzyme activity. The enzyme solution is incubated with the horn sample, and then enzyme activity is determined using the appropriate technique. The concentration of organophosphates in the horn sample can be determined using a calibration curve or a standard reference based on the detected enzyme activity. The lack of precise information regarding pH, incubation duration, and measurement technique makes it challenging to fully understand and mimic the experimental process.

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The entropy of the universe increases because energy is continuously dissipating in the form of heat.

The term entropy makes reference to the levels of the randomness (state of disorder) of the matter and energy.

In conclusion, the entropy of the universe increases because energy is continuously dissipating in the form of heat.

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Matter is anything that has mass and takes up space.

hope this helps <3

There are 6,849.79 grams in a container of 2.26 x 10^25 molecules of dinitrogen trisulfide.

To calculate the number of grams in a container of 2.26 x 10^25 molecules of dinitrogen trisulfide, we need to use the Avogadro's constant and the molar mass of dinitrogen trisulfide.

First, let's calculate the number of moles of dinitrogen trisulfide in the container:

Number of molecules = 2.26 x 10^25 molecules

Avogadro's constant = 6.022 x 10^23 molecules/mol

Number of moles = Number of molecules / Avogadro's constant

Number of moles = 2.26 x 10^25 molecules / 6.022 x 10^23 molecules/mol

Number of moles = 37.6 mol

Next, let's find the molar mass of dinitrogen trisulfide:

Dinitrogen trisulfide has the chemical formula N2S3.

The molar mass of N2S3 = 2 x (14.01 g/mol) + 3 x (32.06 g/mol) = 182.22 g/mol

Finally, let's use the number of moles and molar mass to find the mass of dinitrogen trisulfide:

Mass (in grams) = Number of moles x Molar mass

Mass (in grams) = 37.6 mol x 182.22 g/mol

Mass (in grams) = 6,849.79 g

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Answer:

67.3g

Explanation:

%(w/w) = mass of solute/total mass of solution × 100

According to this question, an aqueous solution contains 32.7% KCl (w/w%). Firstly, we find the mass of the solute (KCl) as follows, if the mass of solution is 100g:

32.7 = mass of solute/100 × 100

mass of solute (KCl) = 32.7g

Mass of solution = mass of solvent (water) + mass of solute (KCl)

100g = x + 32.7g

x = 100 - 32.7

x = 67.3

Hence, the mass of water contained in the 100g solution is 67.3g.

The biotic factors are bacteria soil, dead leaves, and stream water.

An abiotic factor is a non-living part of an ecosystem that shapes its environment.

Biotic and abiotic factors make up a community via interaction.

Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.

The dead leaves of plants are an abiotic factor, the bacteria in soil are living matter and stream flowing, etc.

Hence, the biotic factors are bacteria soil, dead leaves, and stream water.

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The masses of dimethylamine and dimethylammonium chloride do you need to prepare 8. 00 l of pH = 12. 00 buffer is 1448 gm.

A buffer is an aqueous solution that can resist significant changes in pH levels upon the addition of small amount of acid or alkali.

dimethylamine (CH₃)₂NH and dimethylammonium chloride (CH₃)₂NH * HCl are mixed to prepare a buffer solution

The concentration of the components is given as 0.5M , Volume = 8L

no. of moles = CV = 0.5 * 8 =4 moles

4 moles of dimethylamine = mass/ Molecular weight

Molecular weight of dimethylamine = 45 gm

Therefore the mass of dimethylamine required = 45 * 4 = 180 gm

4 moles of dimethylammonium chloride = 362 gm

Therefore the mass of dimethylammonium chloride required = 362*4 = 1448 gm

Thus the masses of dimethylamine and dimethylammonium chloride do you need to prepare 8. 00 l of pH = 12. 00 buffer is 1448 gm.

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Over time, the atomic size shrinks because as number of shells stays constant but more electrons are added, increasing the nuclear charge.

The distance between an atom's central nucleus and also its outermost shell is known just like its atomic size. The smallest distance here between atom's nucleus and its outermost shell is known as the atomic radius within basic chemistry.

The orbitals from higher primary energy levels have greater sizes than the orbitals form lower principal energy levels. Atomic radius grows down a group as a result of the stronger impact of the major energy levels outweighing a increase overall nuclear charge.

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Answer:

Explanation:

An object decreases in size due to the collision of materials. An object increases in size due to the addition of materials. Gas particles are formed from solar nebula materials.

Answer: An object decreases in size due to the collision of materials. An object increases in size due to the addition of materials. Gas particles are formed from solar nebula materials.

Explanation:

long answer lol

Answer:

C. Compression

Explanation:

edge 2021

Compression stress force produces reverse faults. Therefore, option (C) is correct.

A fault can be described as the rupture of the earth's crust, horizontally, and a reverse fault defines as a 'dip-slip' fault moving vertically. The crust of the earth moves along faults, which are everywhere, both on land as well as on the crust under the oceans.

A reverse fault can be described as a type of dip-slip fault. These faults move vertically and the earth moves up or down relative to these faults.  are different kinds of faults, classified by how the earth on either side of the fault moves.

In a normal fault, one side of the fault slides down so when one side of the fault does go up instead of down, it is known as a reverse fault. A  special kind of reverse fault is known as a thrust fault.

Therefore, the compression stress force produces reverse faults while the tensional stress force produces normal faults.

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The carbonyl stretching frequency in the infrared spectrum depends on the nature of the carbonyl group and the adjacent functional groups or substituents. Based on this, we can rank the given molecules in terms of their carbonyl stretching frequency, from highest to lowest:

2,4-cyclohexadienone > 2-cyclohexenone > cyclohexenone > cyclohexanone

In general, a carbonyl group adjacent to an electron-withdrawing group will have a higher stretching frequency compared to a carbonyl group adjacent to an electron-donating group.

In 2,4-cyclohexadienone, the two carbonyl groups are conjugated with each other and with the double bonds in the ring, resulting in a very high carbonyl stretching frequency. In 2-cyclohexenone, the carbonyl group is conjugated with the double bond in the ring, resulting in a slightly lower stretching frequency.

In cyclohexenone, the carbonyl group is adjacent to a single double bond in the ring, resulting in a lower stretching frequency compared to 2-cyclohexenone. In cyclohexanone, the carbonyl group is not conjugated with any other functional group, resulting in the lowest carbonyl stretching frequency among the given molecules.

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Answer:

3.

a.climate

4.

c.average measurements of temperature and rainfall over many years

Answer:

atoms and molecules

Explanation:

matter is made up of particles called atoms and molecules

Matter is made up of small molecules and attoms

Answer:

true

downstream to the riverbed. However, the most common mechanism to produce older rocks on top of younger is by thrust faulting. Thrust faults form where rocks are being compressed, usually by plate tectonic mechanisms. Thrust faults rip up older strata and pile it on top of younger rocks.

Explanation:

Answer: V=67.2 L

Explanation:

For this problem we will need to use the Ideal Gas Law.

Ideal Gas Law: PV=nRT

P=1.00 atm (STP)

V=?

n=3.00 mol

R=0.08206Latm/Kmol

T=273.15 K (STP)

To find V, we would manipulate the equation to V=nRT/P

\(V=\frac{(3.00 mol)(0.08206Latm/Kmol)(273.15K)}{1.00 atm}\)

\(V=67.244 L\)

With significan figures, our answer is V=67.2 L.

Chlorophyll molecules in chloroplasts normally only fluoresce a very small amount compared to chlorophyll that has been extracted into a solvent solution, true.

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Answer:

limited

Explanation:

have a good day :)

Answer:

change

Explanation:

These terms refer to the change into the different states of  matter.

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Tell me honnnnnn.

Answer: The water will taste sour.

Explanation:

Answer: D. The water will taste sour (Edmentum)

Explanation:

Answer:

True

Explanation:

Mark as brainliest

Answer:

true

Explanation: