True or false. The geological features of the eastern part of South America and western Africa matched each other.

Answer:

15 X 6 X 10 = 900 cm³

Explanation:

Answer:

I think you need to dissolve 62.116 (or 62.12g) of Li2SO4 .

The mass of lithium sulfate needed is 62g

Molality is also known as molal concentration. It is a measure of solute concentration in a solution. The solution is composed of two components; solute and solvent.

It is defined as the moles of the solute present in 1kg of the solvent. It is denoted by 'm'.

This term is useful in understanding the concentration of a solution because its formula is independent of temperature and pressure. Thus, the colligative properties are dependent on molality.

Given,

Molality of solution = 1.23m

Mass of solvent ( water) = 459g

Molality = number of moles of solute ÷ mass of solvent in kg

number of moles of solute = molality × mass of solvent in kg

                                       = 1.23 × 0.459

                                          = 0.564 moles

moles = mass / molar mass

mass= 0.564 × 109.94

            = 62 g

Therefore, the mass of lithium sulfate needed is 62g

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Answer:

compared to sodium, silicon has a higher ionization energy meaning it takes more energy to remove electrons.

Explanation:

hope this helps

can u please give me and Brainlist

Answer:

B)Answer is:-

In some plants, the roots change their shape and get modified to absorb and transport water and minerals from the soil to different parts of the plant. They are also modified for support, food storage, and respiration. The root modifications perform two major functions- Physiological and Mechanical

C)some plant species have modified stems that are especially suited to a particular habitat and environment. A rhizome is a modified stem that grows horizontally underground; it has nodes and internodes. Vertical shoots may arise from the buds on the rhizome of some plants, such as ginger and ferns

Explanation:

Answer:

n = 0.21 moles

Explanation:

Given that,

Volume, V = 0.84 L

Pressure, P = 4.6 atm

T = 222 K

We need to find the number of moles of Neon gas. We know that,

PV = nRT

Where

n is the number of moles

R i the gas constant, R = 0.08206 L-atm/mol-K

Put all the values,

\(n=\dfrac{PV}{RT}\\\\n=\dfrac{4.6\times 0.84}{0.08206 \times 222}\\\\n=0.21\ \text{moles}\)

So, there are 0.21 moles of Neon gas.

i think it's d white one cause it's has less volume but more matter making its mass volume ratio high than that of the blue one

The white cube is denser, because it has less volume, but a lot more matter. So option D is correct.

A material called matter is made up of several kinds of particles, occupies space, and has inertia. The many sorts of particles each have a unique mass and size according to the fundamentals of current physics. The electron, proton, and neutron are three examples of material particles that are most well-known.

A material with a given mass and a certain volume in space is referred to as a matter. Examples of matters are pens, pencils, toothbrushes, water, and milk, as well as vehicles like cars, buses, and bicycles.

According to its physical and chemical makeup, "matter" can be defined as being composed of atoms. Ordinary matter is another name for such atomic stuff. For instance, since DNA molecules are composed of atoms, they fall under the notion of matter.

Thus, option D is correct.

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The conversions that could be performed with these two conversion factors alone, Density—> molar mass or/formula mass—> is volume ---> moles; option D

Conversion factors are expressions or values which are used to convert from one unit or value to another.

The conversion factor given is:

Density—> molar mass or/formula mass—>

volume = density/mass

moles = mass/molar mass

Volume to moles = density/mass -->  mass/ molar mass

Volume to moles = density ---> molar mass or formula mass

The conversion of volume to moles will therefore require density and molar mass or formula.

In conclusion, conversion factors are used to convert from one unit  value to another.

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Answer

An acid removes OH⁻ ions from water.

A base removes H⁺ ions from water.

Explanation

An acid is a chemical species that donates protons or hydrogen ions and/or accepts electrons. Most acids contain a hydrogen atom bonded that can release (dissociate) to yield a cation and an anion in water.

Hence, an acid removes OH- ions from water.

A base is a substance that results in an increase in the concentration of hydroxide ions when it is dissolved in water. Also, a base is a substance that when dissolved in water increases the number of hydroxide ions.

Therefore, a base removes H+ ions from water.

Answer:

metal

Explanation:

a solid material which is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity (e.g. iron, gold, silver, and aluminium, and alloys such as steel).

Ionic compounds are formed between a metal and non-metal by lose or gain of electrons. When naming an ionic compound the metal is written first.

Ionic compounds are formed by losing one or more electrons from the metal to a nonmetal. Metals are electron rich and electropositive. Thus, they can easily lose an electron during chemical bonding.

Ionic bond is the strongest type of bond. Electronegative nonmetal atoms such as halogens, oxygen, nitrogen etc are electron deficient ad they gains electrons from metals to form ionic compounds.

When naming an ionic compounds, the cationic part that is the part from which electron is lost is named first. Here metals are cations and they written first.

For example, in NaCl the name is sodium chloride. Similarly KBr, the metal potassium is named first as potassium bromide.

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Answer:

Word equation: Tin + Hydrogen fluoride → Tin (II) fluoride + Hydrogen gas

Skeleton equation: Sn + 2HF → SnF2 + H2

The best way to measure the pH of a natural solution while out in a forest is to use a portable pH meter or pH test strips specifically designed for field use. These instruments provide accurate and reliable pH measurements and are convenient for outdoor applications.

1. Prepare the necessary equipment: Before heading out to the forest, gather the required tools. You will need a portable pH meter or pH test strips, as well as the necessary reagents or calibration solutions if using a pH meter.

2. Collect the sample: Locate the natural solution you want to measure the pH of, such as a stream, pond, or soil. Use a clean container to collect a representative sample of the solution.

3. Calibrate the pH meter (if applicable): If you are using a portable pH meter, it is essential to calibrate it before taking measurements. Follow the manufacturer's instructions to calibrate the meter using the provided calibration solutions.

4. Conduct the measurement: For pH meters, immerse the electrode into the collected sample. Allow some time for the reading to stabilize, and then record the pH value indicated on the meter's display.

5. Using pH test strips: If you are using pH test strips, dip the strip into the collected sample for the recommended amount of time. Remove the strip and compare the color change with the provided color chart. Determine the corresponding pH value from the chart.

6. Repeat for accuracy: To ensure reliability, repeat the measurement process at least once and compare the results. This step helps confirm the accuracy of your measurements.

7. Record and analyze the data: Note down the pH values obtained and any relevant observations. Analyze the data as needed for your research or monitoring purposes.

By following these steps and using the appropriate equipment, you can effectively measure the pH of a natural solution while in a forest setting.

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The compound contains approximately 0.1486.02210^23 carbon atoms, or about 8.9*10^22 carbon atoms. Thus, the number of carbon atoms in the compound is approximately 15.

The molecular formula of a compound is a representation of the number and types of atoms that constitute one molecule of that compound.

To solve this problem, we can use the isotopic distribution of carbon in the compound to determine the molecular formula. The relative abundance of each isotope is related to the number of atoms of that isotope in the molecule.

Let's assume the molecular formula of the compound is CxHy, where x is the number of carbon atoms and y is the number of hydrogen atoms. We can use the following equation to relate the relative abundance of each isotope to the number of carbon atoms:

(0.9893)x(0.4475) + (0.0107)x(0.02904) = 0.02904

Simplifying this equation, we get:

0.443x + 0.00031268x = 0.02904

0.44331268x = 0.02904

x = 0.06556/0.44331268

x = 0.148

Therefore, the compound contains approximately 0.1486.02210^23 carbon atoms, or about 8.9*10^22 carbon atoms. Thus, the number of carbon atoms in the compound is approximately 15.

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The number of carbon atoms in the compound can be determined by calculating the ratio of C12 to C13 isotopes present.

Carbon atoms are the building blocks of life. They are the most abundant element in the human body and make up the molecules that create all living things. Carbon atoms are found in proteins, carbohydrates, and lipids, and are essential for the functioning of all living organisms. Carbon atoms are made up of six protons, six neutrons, and six electrons, and are the backbone of organic chemistry.

Since the relative abundances of C12 and C13 are 44.75% and 2.904% respectively, the ratio of C12 to C13 can be calculated as follows:

C12/C13 = (44.75/2.904) = 15.39

We can then compare this ratio to the natural abundance of C12 and C13, which is 98.93% and 1.07%, respectively.

If the ratio of C12 to C13 in the compound is equal to the natural abundance of these isotopes, then the number of carbon atoms in the compound must be 12.

C12/C13 = (98.93/1.07) = 92.52

Since the ratio of C12 to C13 in the compound is not equal to the natural abundance of these isotopes, then the number of carbon atoms in the compound must be 13.

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Answer:

Explanation:We known that Earths energy machine is driven by sunlight which acts as fuel for this machine and to strike a balance between outgoing long wave radiation and short wave radiation there are many factors which are involved in this process.Sun emits this energy in the form of short wave radiation because of the huge energy it has and short wave radiation are higher in energy.Hence, they reach the earth surface mostly as visible and UV rays.After reaching the earths surface what happens with these rays is that they get absorbed by the clouds and other constituents of Earth.

Now, this energy needs to be emitted back in to space in order to balance out the energy budget of earth and that is why this energy is emitted back as long wave radiation which have less energy and also earth has less energy unlike the sun.Loss of this energy is essential as Earth looses most of its energy through this and results in cooling.But when this OLR decreases it should be a cause of concern for us.

This imbalance is caused by a wide range of different human induced activities which has a cumulative effect on the temperature of earth.These activities gives rise to a huge gain in the CO2 concentration which is why this word has gain so much popularity and a cause of widespread concern for us.At community level we contribute to this heating by increasing usage of personal automobiles rather than going for public transport , advancement in technology has greatly changed our lifestyles making it more simpler and easier but this demands more energy consumption.Landscape changes are one of the most important because its taking place at a faster rate.Most of the land being cleared off to built new houses which means clearing off the existing vegetation which leads to temperature rise.Setting up of Industry depending on its type can reduce the amount of OLR escaping the surface by introducing more amount of GHGs in to the atmosphere.

Its these small communities which add up to become the entire human population causing a massive damage and hence at community level if people realize and take necessary steps things will start to change.

The stoichiometric table and the rate law for the given elementary liquid phase reaction have been constructed. The rate constant and activation energy have been calculated, and the type of reaction energy has been specified as endothermic.

Stoichiometric table in terms of concentrations:

The stoichiometric table for the given reaction can be constructed as follows:

A + 2B → products

                             A                                B                                products

Feed         0.3*Cf                        0.7*Cf                                       0

Exit              (0.3-0.3X)*C             (0.7-0.7X)*C                                0

Change         -0.3XC                      -0.7XC                                     0

Where:

Cf = Total feed concentration

C = Concentration inside reactor

X = Conversion of A

Rate of reaction of A:

The rate of the reaction can be expressed as:

rA = -1/2 * dCA/dt = k*C^2

where, CA is the concentration of A and k is the rate constant.

Since the reaction is elementary, the rate law is proportional to the concentrations of the reactants raised to their stoichiometric coefficients.

The rate of disappearance of A = rate of appearance of B

rB = -dCB/dt = 2*rA

Therefore, the rate of reaction of A can be expressed as:

rA = (0.7Cf - 0.7C)/V = k*C^2

Substituting values, we get:

rA = (0.710 - 0.70.7X)/5 = k(0.3 - 0.3*X)^2

Calculation of k and E:

The rate constant k can be calculated using the Arrhenius equation:

k = A * exp(-Ea/RT)

where A is the frequency factor, Ea is the activation energy, R is the gas constant and T is the temperature in Kelvin.

Assuming the activation energy is 50 kJ/mol, we can calculate the rate constant at the given temperature of 333 K:

k = 0.00717 * exp(-50000/(8.314*333)) = 0.0001504

The reaction energy can be determined by calculating the activation energy using the rate constant at two different temperatures. Assuming the rate constant at 323 K is 0.000098, we can solve for Ea:

ln(k2/k1) = Ea/R * (1/T1 - 1/T2)

ln(0.000098/0.0001504) = Ea/8.314 * (1/323 - 1/333)

Ea = 43775 J/mol

The positive value of the activation energy indicates that the reaction is endothermic.

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A pH of 4 is ten times more acidic than a pH of 5.

Yes, pH can have decimal values. In fact, pH values can range from 0 to 14 and can have any value between them including decimals. pH is a measure of the acidity or alkalinity of a solution, and it is determined by the concentration of hydrogen ions (H+) in the solution.A solution with a pH of 7 is neutral, which means that it has an equal concentration of hydrogen ions (H+) and hydroxide ions (OH-). An acidic solution has a pH below 7 and a high concentration of H+ ions. On the other hand, an alkaline solution has a pH above 7 and a low concentration of H+ ions.A pH that is less than 7.0 indicates acidity. pH less than 7.0 is acidic while pH greater than 7.0 is alkaline. Each number on the pH scale represents a ten-fold change in the acidity/alkalinity of the solution. For example, a pH of 5 is 10 times more acidic than a pH of 6, and 100 times more acidic than a pH of 7.A pH of 0 indicates a very strong acidic solution while a pH of 14 indicates a very strong alkaline solution. It's worth noting that pH is a logarithmic scale, meaning that a change of one pH unit corresponds to a ten-fold change in hydrogen ion concentration.

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Answer    1 mole = 6.02 × 1023 atoms

0.25 moles × (6.02 × 1023) = 1.5 × 1023 atoms Carbon

for the first one

Answer:

The Correct answer is B

activation energy of the reaction

or

speeds up the reaction

Question 1

The formula mass of methanol is \(12.0+3(1.01)+16.0+1.01=32.04\) g/mol.

Therefore, in 5.0 grams of methanol, there are \(5.0/32.04=\boxed{0.16}\) moles.

Question 2

The formula mass of copper(II) carbonate is \(63.5+12.0+3(16.0)=123.5\) g/mol.

This means that in 9.0 grams of copper(II) carbonate, there are \(9.0/123.5=0.072874493927126\) moles.

Using Avogradro's number, there are \((0.072874493927126)(6.022 \times 10^{23})=\boxed{4.4 \times 10^{22}}\) molecules.

Question 3

The formula mass of cyclohexane is \(12.0(6)+1.01(12)=84.12\) g/mol.

So, 3.0 grams of cyclohexane is the same as \(3.0/84.12=\boxed{0.036}\) moles.

Question 4

The formula mass of benzene is \(12.0(6)+1.01(6)=78.06\) g/mol.

This means that 4.00 moles of benzene has a mass of \((78.06)(4.00)=\boxed{312}\) grams.

Question 5

1000 atoms of calcium is the same as \(\frac{1.000}{6.022 \times 10^{23}}\) moles.

This is equal to \(\frac{1000}{6.022 \times 10^{23}} \cdot 40.078=\boxed{6.7 \times 10^{-20}}\) grams.

They appear as the trait over a recessive allele. Statement C) is true about the dominant alleles.

Dominant alleles are genetic variants that, when present in an individual's genotype, are expressed phenotypically, meaning they determine the visible or observable traits. Dominant alleles are represented by capital letters, while recessive alleles are represented by lowercase letters in genetics.

In terms of inheritance, if an individual has at least one copy of the dominant allele, it will be expressed in the phenotype, regardless of the presence of a recessive allele. This is because dominant alleles exert their influence over recessive alleles, thus "dominating" their expression.

To illustrate this, let's consider a specific example using a trait controlled by a single gene with two possible alleles: dominant (A) and recessive (a). If an individual is homozygous dominant (AA), meaning they possess two copies of the dominant allele, the dominant trait will be expressed.

However, if an individual is homozygous recessive (aa), with two copies of the recessive allele, the recessive trait will be expressed since there are no dominant alleles to override it.

Therefore, dominant alleles appear as the trait over recessive alleles, regardless of the presence or absence of a recessive allele. The presence of even a single copy of the dominant allele is sufficient for its expression in the phenotype. Option C

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Answer:

Gamma Rays

Explanation:

Each section of the electromagnetic (EM) spectrum has characteristic energy levels, wavelengths, and frequencies associated with its photons. Gamma rays have the highest energies, the shortest wavelengths, and the highest frequencies.

I looked it up

Answer:

The correct answer is 10.939 mol ≅ 10.94 mol

Explanation:

According to Avogadro's gases law, the number of moles of an ideal gas (n) at constant pressure and temperature, is directly proportional to the volume (V).

For the initial gas (1), we have:

n₁= 1.59 mol

V₁= 641 mL= 0.641 L

For the final gas (2), we have:

V₂: 4.41 L

The relation between 1 and 2 is given by:

n₁/V₁ = n₂/V₂

We calculate n₂ as follows:

n₂= (n₁/V₁) x V₂ = (1.59 mol/0.641 L) x 4.41 L = 10.939 mol ≅ 10.94 mol

The number of moles is 10.94 mol.

The calculation is as follows:

The following formula should be used:

\(n_1\div V_1 = n_2\div V_2\\\\n_2= (n_2\div V_1) \times V_2\\\\ = (1.59 mol\div 0.641 L) \times 4.41 L\)

= 10.939 mol

= 10.94 mol

Therefore we can conclude that the number of moles is 10.94 mol.

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The specific heat capacity of the metal can be calculated using the calorimeter equation. The specific heat capacity of the metal is obtained as 0.406 J/(°C g).

The specific heat capacity of a substance is the heat energy required to raise its temperature by one degree celsius per one gram of that substance.

The calorimeter equation relating heat energy q, mass m and temperature difference ΔT and specific heat capacity c is written as:

q = mcΔT.

In the given system the heat energy is transferred from the metal to water thus the final temperature of both will be 25 °C. Thus, at thermal equilibrium we can write it as:

25 g × c (95 -25 °C) = 25 × 4.18  × (25 - 18.2 °C )

Where, mass of water can be taken as 25 g since its density is 1 g/ml. From this specific heat capacity of the metal c is calculated as follows:

c =  [ 25 × 4.18  × (25 - 18.2 °C ) ] / 25 g ×  (95 -25 °C)

  = 0.406 J/(°C g).

Therefore, the specific heat capacity of the metal is  0.406 J/(°C g).

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Answer:

Well atomic number 17 is Chlorine, which is most commonly found as a gas, and is period 7.

Explanation:

elements found on period 7 are some of the most unstable elements.

Answer:

1st one is...

Explanation:

The 1st one is change in size or shape. 2nd one is formation of precipitate. 3rd one is physical change. 4th one is formation of gas.

Answer:

0.86

Explanation:

1mol of Zn has mass of 65.39g.The amount of Zn is 2.5g65.39g/mol=0.038mol.

The amount of H2 produced is the same as the amount of Zn consumed (0.038mol).

1mol of ideal gas will occupy 22.4L at STP.

The H2 will occupy 0.038mol×22.4L/mol=0.86L

.

Answer:

Hello, The answer to your question is,

D. comparison

Explanation:

I hope this helps |^_^|

Answer:

The answer is 76.36 torr

Explanation:

using P1V1=P2V2

Since temperature did not change

P2=P1V1/V2

P2=262×21/75

P2=73.36 torr

Answer:

Explanation:

i) in keeping industrial machine cool

ii) in textile inustries for dying clothes