A low ph scale would indicate that the water is A. Neutral B. Basic C. Acidic

Answer:

it would be number 4

Explanation:

The visual indicator that enough of a drying agent , such as anhydrous MgSO4 or CaCl2 has been added to properly dry an organic solution is that the drying agent will move freely like a powder around the solution .

Because the anhydrous form is hygroscopic ( readily absorbs water from the air ).

What is the work of anhydrous magnesium sulphate ?

Magnesium sulphate is frequently used in the laboratory as an indicator, especially after aqueous work-up . aqueous work-up is a common technique in the lab to get rid of residual impurities after completion of a reaction . for this the organic reaction is cooled to room temperature and mixed with water .specific impurities will then diffuse into the aqueous phase and can be separated with a separatory funnel .

unfortunately some residual water will stay in the organic phase and this can have negative impact for characterization of compound . therefore Magnesium sulphate is added ,which is able to catch the residual water in its crystal lattice .after filtration of the solid magnesium sulfate ,the water is reduced to non-significant amount and the compound ready for further investigation.

Similarly , calcium chloride is strongly hygroscopic ( absorbs water from the environment ) , so it removes moisture from the air ,making it dryer . this results in water  in the substance to be dried to evaporate into the drier air and this cycle repeats until the system reaches an equilibrium.

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Answer:

C. 12.8 liters.

Explanation:

The Standard Temperature and Pressure (STP) of a gas are 273.15 K and 100 kilopascals. From Avogadro's Law, a mole of carbon dioxide contains \(6.022 \times 10^{23}\) molecules. If we suppose that carbon dioxide behaves ideally, then the equation of state for ideal gas is:

\(P\cdot V = n\cdot R_{u}\cdot T\) (1)

\(P\cdot V = \frac{r\cdot R_{u}\cdot T}{N_{A}}\) (1b)

Where:

\(P\) - Pressure, measured in pascals.

\(V\) - Volume, measured in liters.

\(r\) - Amount of molecules, no unit.

\(N_{A}\) - Avogadro's number, no unit.

\(R_{u}\) - Ideal gas constant, measured in pascal-liters per mole-Kelvin.

\(T\) - Temperature, measured in Kelvin.

If we know that \(P = 100000\,Pa\), \(r = 3.44\times 10^{23}\), \(N_{A} = 6.022\times 10^{23}\), \(T = 273.15\,K\) and \(R_{u} = 8.314\times 10^{3}\,\frac{L\cdot Pa}{mol\cdot K}\), then the volume of carbon dioxide at STP is:

\(V = \frac{r\cdot R_{u}\cdot T}{N_{A}\cdot P}\)

\(V = \frac{(3.44\times 10^{23})\cdot \left(8.314\times 10^{3}\,\frac{L\cdot Pa}{mol\cdot K} \right)\cdot (273.15\,K)}{(6.022\times 10^{23})\cdot (100000\,Pa)}\)

\(V = 12.972\,L\)

Therefore, the correct answer is C.

This problem is providing the energy of a photon of light as 2.95 × 10⁻¹⁷ J and it is required to calculate its frequency, according to the electromagnetic spectrum theory. At the end, the answer turns out to be 4.52x10¹⁶ Hz according to the following:

In chemistry, we use the electromagnetic spectrum in order to know how the wavelength, frequency and energy of particles are related to each other. In this particular case, we have a photon and the frequency can be calculated with the following arrangement:

\(E=h\nu\\\\\nu=\frac{E}{h}\)

Whereas E is the energy, h the Planck's constant and ν the frequency. Thus, we plug in these first two to obtain:

\(\nu=\frac{2.95x10^{-17}J}{6.626x10^{-34}J*s}\\\\\nu=4.45x10^{16}s^{-1}=4.45x10^{16}Hz\)

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Answer:

Explanation:

Velocity = distance over time

where distance = 5.20 m

                   time = 10.4 s.

velocity =  5.20  m

                  10.4 s.

            = 0.50 m/s  

Force is:F = k*(q1 + q2) / r2 In light of this, k * (2.35 * 1.96) / r2 = k * (4.06 * 2.11) / ( 2.26 ) ² / : k4.606 / r² = 8.5666 / 5.10768.5666 r² = 4.606 * 5.1076r² = 23.5256 : 8.5666r² = 2.7462r = √2.7462. Reply: r = 1.66 pm

When two (or more) objects interact, forces are produced. Both act on the other with an equal but opposing power. As a thing moves, external forces are at work. The object moves uniformly regardless of an internal force.

The state of rest or motion of an object, as well as the shape of the object, can all be changed or may have a tendency to be changed by force, which is a physical cause. A force is measured in Newtons in the S.I.

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There are numerous ways that fossils can form, but the majority occur when a living thing—such as a plant or animal—dies and is swiftly buried by sediment—such as mud, sand, or volcanic ash and rock.

Thus, Only the hard bones or shells are left behind when soft tissues degrade, yet in some cases an organism's soft tissues can be retained and animals.

More sediment, volcanic ash, or lava may accumulate over the organism after it has been buried, and eventually all the layers harden into rock.

These once-living organisms are only revealed to us from within the stones when the process of erosion takes place, when the rocks are worn back down and washed away and fossil.

Thus, There are numerous ways that fossils can form, but the majority occur when a living thing—such as a plant or animal—dies and is swiftly buried by sediment—such as mud, sand, or volcanic ash and rock.

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Answer: Hydropower plants can negatively affect the fish population in an ecosystem.

Answer:

              166 g of Zinc

Explanation:

First calculate moles of Gold.

Moles = Mass / M.Mass

Moles = 500 g / 196.96 g/mol

Moles = 2.54 mol

Secondly, calculate mass of Zinc using moles of Gold.

Mass = Moles × M.Mass

Mass = 2.54 mol × 65.36 g/mol

Mass = 166 g of Zinc

Answer:

132.0grams

Explanation:

The formula mass of a compound/molecule is calculated by summing the atomic masses of each individual atom in that compound or molecule.

According to this question, the gram-formula mass of CO2 is given as 44g i.e. by adding 12g of C and 2 × 16g of O. 3CO2 means that 3 moles of the same CO2 molecule.

To find the gram-formula mass of 3 moles of CO2, the following formula is used:

Since 1 mol of CO2 contains a formula mass of 44g

3 moles of CO2 (3CO2) will contain 3 × 44g = 132g of CO2.

Answer:

C

Explanation:

It's the amount of products you get compared to all the reactants you use. It's kind of like economy in that it's profit, and the higher the atom economy the more products/profit you have.

Answer:

C.) The measure of how much of the reactants end up as products in a chemical reaction.

Explanation:

I got it right on founders edtell.

Answer:

ecology

Explanation:

Ecology is the study of the interactions between organisms and their environment (biotic and abiotic) •

Answer:

ecology

Explanation:

Ecology is the study of the interactions between organisms and their environment

Whilst atmospheric pressure is much less than the strain inside the lung, air flows down this gas strain gradient. Then air actions from the surroundings into the lungs.

In atmospheric technology, the stress gradient is a bodily amount that describes wherein route and at what price the strain will increase the maximum hastily around a specific region. The strain gradient is a dimensional quantity expressed in units of pascals in line with the meter.

The atmospheric pressure with horizontal distance is named as strain gradient. Winds blow faster whilst the stress gradient is steep. The pressure gradient is the pressure rises or falls. The gradient is steep when straining adjustments in a quick distance and slight when strain changes long distances.

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Answer:3.381 X 10^(-11)

Explanation:

The formula for buoyant force is F = -Volume*density*gravitational acceleration. Convert volume and density to SI units and then apply them in the formula where gravitational acceleration is 9.8m/s^2. Done

Answer:

filtration and Chromatography

Explanation:

The first method used for separation of solids from the mixture is filtration. Filtration is used to separate different solids in a mixture which has particles of different sizes. Other method is Chromatography in which the compounds in the mixtures are separated from each other by moving the mixture at high speed. Due to high speed, the compounds are separated from each other because different compounds have different speeds so it is separated easily.

A. iron

B. iodine

C. Helium

D. calcium

E. lead

F. hydrogen

check your periodic table to see if they are correct

atomic number, proton number and electron are the same

to find neutron = mass number - atomic number

Answer: 200000 J

Explanation:

Formula for kinetic energy: Ek=1/2 *mv^2

m=1000 kg. v=20.0m/s

Ek=1/2 *1000*20^2

Ek=500*400

Ek=200000 J

J=joules

Answer: Calcium carbide (CaC2) reacts with water to produce acetylene (C₂H₂):. CaC2 (s) + 2H2O (g) → Ca(OH)2 (s) + C₂H₂ (g).

Answer:

a. 53.5 g/mol

b. 80.06 g/mol

c. 133.33 g/mol

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

a. NH₄Cl

b. NH₄NO₃

c. AlCl₃

Step 2: Find masses

Molar Mass of N - 14.01 g/mol

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of Al - 26.98 g/mol

Molar Mass of Cl - 35.45 g/mol

Step 3: Calculate compound masses

Molar Mass of NH₄Cl - 14.01 g/mol + 4(1.01 g/mol) + 35.45 g/mol = 53.5 g/mol

Molar Mass of NH₄NO₃ - 2(14.01 g/mol) + 4(1.01 g/mol) + 3(16.00 g/mol) = 80.06 g/mol

Molar Mass of AlCl₃ - 26.98 g/mol + 3(35.45 g/mol) = 133.33 g/mol

Answer:

130

Explanation:

Maintain hot food at 135°F or above. Properly cooked roasts may be held at 130°F or above.

135°F is the minimum hot holding temperature for fried chicken. The most often used scales are indeed the Celsius scale.

Temperature is a physiological measure that quantifies our feelings of hotness and coolness. A thermometer is used to measure temperature.

Thermometers were calibrated in a variety of temperature scales that have traditionally been defined by various reference points including thermometric substances.

The most often used scales are indeed the Celsius scale, with the unit sign °C, the Fahrenheit level (°F), as well as the Scale parameter (K), with the latter being mostly used for scientific reasons. The kelvin is one of the International System of Units' seven basic units (SI). 135°F is the minimum hot holding temperature for fried chicken.

Therefore, 135°F is the minimum hot holding temperature for fried chicken.

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A pure substance is made up of only one type of particle as this is the reason for the denomination 'pure'.

The relative chemical composition of a pure substance is based on only one type of compound or element, which is thus the major determinant of a substance to be considered pure for a given solution.

Therefore, with this data, we can see that the relative chemical composition of a pure substance is based on the presence of one class of element.

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Answer:

A pure substance is made up of only one type of particle. These particles can be atoms, ions, or molecules, depending on the nature of the substance. In other words, a pure substance is homogeneous, meaning that it has the same composition and properties throughout its entire volume.

Answer:

because metal A is not suitable for electric connection and metal B is suitable

A metallic wire is a cylindrical and flexible wire that carries electricity. Metal A wire gets hot as it is not suitable to conduct electricity.  

A conductor is a substance that can carry or pass the electricity and heat through it. The thickness and the length of the wire play a role in resistivity.

The metallic wire with good conductivity passes the electricity easily through it, while bad conductivity results in the release of heat through the wires making them lose energy.

Therefore, metal A wire gets hot.

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Answer:

=> 2.8554 g/mL

Explanation:

To determine the formula to use in solving such a problem, you have to consider what you have been given.

We have;

mass (m)     = 16.59 g

Volume (v) =  5.81 mL

From our question, we are to determine the density (rho) of the rock.

The formula:

\(p = \frac{m}{v}\)

Substitute the values into the formula:

​\(p = \frac{16.59 g}{5.81 mL} \\ = 2.8554 g/mL\)

= 2.8554 g/mL

Therefore, the density (rho) of the rock is 2.8554 g/mL.

The percentage of women with hypertension, defined as a diastolic blood pressure level above 90 mmHg, can be calculated using the standard normal distribution table.

To find the percentage, we need to calculate the z-score for a diastolic blood pressure of 90 mmHg using the formula:

z = (x - μ) / σ

where x is the diastolic blood pressure value, μ is the mean, and σ is the standard deviation.

In this case, x = 90 mmHg, μ = 70.2 mmHg, and σ = 10.8 mmHg.

Substituting these values into the formula, we get:

z = (90 - 70.2) / 10.8 = 1.833

Next, we need to find the corresponding area under the standard normal curve for a z-score of 1.833. By referring to the standard normal distribution table or using a calculator, we find that the area to the left of 1.833 is approximately 0.9664.

To determine the percentage of women with hypertension, we subtract this area from 1 and multiply by 100:

Percentage = (1 - 0.9664) × 100 ≈ 3.36%

Therefore, approximately 3.36% of women have hypertension based on the given diastolic blood pressure criteria.

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The percentage of iron in the sample is obtained as 22.8 %.

We can see that the reaction as it has been shown in the question is a redox reaction equation. We need to find the percent of the iron that is contained in the ore as we have in the question.

We have to obtain;

Number of moles of the permanganate = 39.42/1000 L *  0.0281 M

= 1.11 * 10^-3 moles

Then we can see from the reaction that;

If 5 moles of the iron III reacts with 1 mole of  the permanganate

x moles of the iron would react with 1.11 * 10^-3 moles of  the permanganate

x = 5 * 1.11 * 10^-3 /1

= 5.55 * 10^-3 moles

Mass of the iron = 5.55 * 10^-3 moles * 56 g/mol

= 0.311 g

Given that the percentage of iron = mass of iron present/ mass of iron in the sample = 0.311 g/ 1.362 g * 100/1

= 22.8 %

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2 moles of H2 react with 1 mole of O2 gas, according to the balanced reaction. the stoichiometric ratio of the moles of H2 to the moles of O2 is 2:1 as a result.

When all of the reactants are consumed and none are left after the chemical reaction has finished, it is said to have occurred in a stoichiometric chemical reaction.

Stoichiometry can be summed up as the process of calculating the products and reactants of a chemical reaction. It primarily has to do with numbers. Stoichiometry is a fundamental concept in chemistry that makes it easier to use balanced chemical equations to ascertain the amounts of reactants and products.

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Thus, from the combination of solutes, the least polar solute will elute from the column first, and the most polar solute will elute from the column last. The least polar of the chemicals is ethyl acetate, whereas the most polar is acetic acid.

Adsorption is the underlying concept of column chromatography. A mixture of substances that have been dissolved in the mobile phase is introduced into the column, and the substances move in accordance with their relative affinities. The mixture's solubility properties affect the solvent that is chosen.

To leave the particle, smaller molecules travel a more complicated path (like a maze) than do larger molecules. Larger-sized molecules elute from the column first because they enter the stationary phase's pores at a very low rate due to their huge size in comparison to the pore size.

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Answer:

A. Supersaturated

Explanation:

i got it right on edge 2021

The heated solution that holds more dissolved solution than it can hold at a lower temperature is supersaturated solution. Therefore, option A is correct.

A solution that contains more solvent than the typical amount that can dissolve at a specific temperature is said to be supersaturated. By introducing a tiny solute crystal known as a seed crystal, the excess dissolved solvent in a super-saturated solution can begin to recrystallize.

A solution that contains more solvent than the typical amount that can dissolve at a specific temperature is said to be supersaturated. A solution is considered supersaturated if it contains more solute than is necessary to saturate it.

A solution that contains more solute than it can hold at a specific temperature is said to be supersaturated. Usually, raising a solution's temperature causes more particles to dissolve, increasing the solute concentration.

Thus, option A is correct.

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