Which two elements are in the same period?
Onitrogen and bismuth
O silver and calcium
fluorine and chlorine
O Potassium and Bromine

\(\\ \rm\hookrightarrow 21000800\)

\(\\ \rm\hookrightarrow 210008\times 10^2\)

\(\\ \rm\hookrightarrow 21007\times 10^3\)

\(\\ \rm\hookrightarrow 2106\times 10^4\)

\(\\ \rm\hookrightarrow 215\times 10^5\)

\(\\ \rm\hookrightarrow 2.1\times 10^7\)

Answer:

boiling point

Answer:

Human cells are eukaryotic which means they are more complicated, bacteria cells are prokaryotic which means they are simpler

Explanation:

Hope this helps

(a) The empirical formula of the compound is \(C_{29}H_ {36}O\)

(b) The molecular formula of the compound is approximately \(C_{8}H_{118}O_{3}\)

To determine the empirical formula of the organic compound, we need to find the simplest whole-number ratio of the elements present.

(a) The given percentages of carbon, hydrogen, and oxygen can be converted into moles by dividing them by their respective atomic masses:

Carbon: 0.624 g / 12.01 g/mol = 0.052 mol

Hydrogen: 0.065 g / 1.008 g/mol = 0.064 mol

Oxygen: 0.028 g / 16.00 g/mol = 0.0018 mol

Next, we divide each of the mole values by the smallest mole value (0.0018 mol in this case) to obtain the mole ratio:

Carbon: 0.052 mol / 0.0018 mol ≈ 29

Hydrogen: 0.064 mol / 0.0018 mol ≈ 36

Oxygen: 0.0018 mol / 0.0018 mol = 1

Therefore, the empirical formula of the compound is \(C_{29}H_ {36}O\)

(b) To find the molecular formula, we need the relative molecular mass of the compound, which is given as 1940 g/mol. The empirical formula mass can be calculated by summing the atomic masses in the empirical formula:

Empirical formula mass: (29 × 12.01 g/mol) + (36 × 1.008 g/mol) + (1 × 16.00 g/mol) = 588.94 g/mol

To find the multiplier, we divide the relative molecular mass by the empirical formula mass:

Multiplier: 1940 g/mol / 588.94 g/mol ≈ 3.29

Rounding to the nearest whole number, the molecular formula of the compound is approximately 3 times the empirical formula, resulting in \(C_{8}H_{118}O_{3}\).

In summary, the empirical formula of the compound is\(C_{29}H_ {36}O\), and the molecular formula is approximately \(C_{8}H_{118}O_{3}\).

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Answer:

ΔH = -470.4kJ

Explanation:

It is possible to sum 2 or more reactions to obtain the ΔH of the reaction you want to study (Hess's law). Using the reactions:

1. CaC2(s) + 2H2O(l) → C2H2(g) + Ca(OH)2(s)ΔH = −414kJ

2. 6C2H2(g) + 3CO2(g) + 4H2O(g) → 5CH2CHCO2H(g)ΔH = 132kJ

6 times the reaction 1.

6CaC2(s) + 12H2O(l) → 6C2H2(g) + 6Ca(OH)2(s)ΔH = −414kJ*6 = -2484kJ

This reaction + 2:

6CaC2(s) + 3CO2(g) + 16H2O(l) →  + 6Ca(OH)2(s) + 5CH2CHCO2H(g) ΔH = -2484kJ + 132kJ = -2352kJ

As we want to calculate the net change enthalpy in the formation of just 1 mole of acrylic acid we need to divide this last reaction in 5:

6/5CaC2(s) + 3/5CO2(g) + 16/5H2O(l) →  + 6/5Ca(OH)2(s) + CH2CHCO2H(g) ΔH = -2352kJ / 5

The pH of the solution can be obtained as 8.8.

We know that the pH tells us the amount of the hydrogen ions that we can be able to find in the solution. We now have the following that can be obtained from the reaction.

Number of moles of the NaOH = 30/1000 * 0.4

= 0.012 moles

Number of moles of HF = 25/1000 * 0.48

= 0.012 moles

Total volume present = 25 mL + 30 mL = 55 mL or 0.055 L

Molarity of NaF = 0.012 moles/0.055 L

= 0.22 M

Kb = 1 * 10^-14/Ka

Kb =  1 * 10^-14/ 6.76×10^−4

Kb = 1.5 * 10^-10

Then we have;

Kb = [HF][OH-] / [F-]

= (x)(x) / 0.22

1.5 * 10^-10 = x^2/0.22

x =  1.5 * 10^-10 * 0.22

x = √ 1.5 * 10^-10 * 0.22

x = 5.7 * 10^-6 M

pOH = - log( 5.7 * 10^-6 )

= 5.2

pH = 14 - 5.2

= 8.8

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Answer:  60 g/mban

Explanation:  I don't know what an "mban" is, but the density of this alien rock would be 60 grams/mban.  Density = Mass/Volume

Answer: 1. Block

2. True ( I'm unsure. He arranged it according to mass, but he is credited for the periodic table)

3. Noble gasses

4. technetium

5. Alkaline earth metals

6. Number of protons

7. False

8. Not true: generally decreases as atomic number increases within a period

9. Argon

10. Four

11. False

12. False

Explanation:

Answer:

\(\large \boxed{\text{0.195 mol/L}}\)

Explanation:

(a) Balanced equation

2HNO₃ + Ca(OH)₂ ⟶ Ca(NO₃)₂ + 2H₂O  

(b) Moles of Ca(OH)₂

\(\text{Moles of Ca(OH)}_{2} = \text{21.1 mL Ca(OH)}_{2} \times \dfrac{\text{0.110 mmol Ca(OH)}_{2}}{\text{1 mL Ca(OH)}_{2}}\\= \text{2.321 mmol Ca(OH)}_{2}\)

(c) Moles of HNO₃

The molar ratio is 2 mol HNO₃:1 mol Ca(OH)₂

\(\text{Moles of HNO}_{3} = \text{2.321 mmol Ca(OH)}_{2} \times\dfrac{\text{2 mmol HNO}_{3}}{\text{1 mmol Ca(OH)}_{2}}= \text{4.642 mmol HNO}_{3}\)

(d) Molar concentration of HNO₃

\(c = \dfrac{\text{moles of solute}}{\text{litres of solution}}\\\\c = \dfrac{n}{V}\\\\c= \dfrac{\text{4.642 mmol}}{\text{23.8 mL}} = \text{0.195 mol$\cdot$L$^{-1}$}\\\\\text{The molar concentration of the Ca(OH)$_{2}$ is $\large \boxed{\textbf{0.195 mol/L}}$}\)

According to the mole concept, the mass of 2.5 moles of calcium is 100 grams.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons.

Number of moles=mass/molar mass, thus mass= 2.5×40=100 g.

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With a balanced reaction, we can determine the moles of products. The balanced equation will be:

FeCl3 + 3NH4OH → Fe(OH)3 + 3NH4Cl

They says that NH4OH is in excess, so, the limiting reactant will be FeCl3 and we will do all the calculations with this reactant.

We have to calculate the moles of FeCl3, we will use the molar mass:

Now, to calculate the moles of the products we must take into account the product/reactive ratios, for this we are guided by the coefficients that accompany the molecules.

Ratio Fe(OH)3 to FeCl3 = 1/1

Ratio NH4Cl to FeCl3 = 3/1

Moles of each product

Moles of Fe(OH)3

Moles of NH4Cl

The grams of each product we will find by multiplying the moles by the molar mass. So we have.

g of Fe(OH)3

g of NH4Cl

Answer: Here is why,

Explanation: Burning of wood is a example of both physical and chemical change. ... Another example is digestion of food ,first the food is chewed into small pieces this is a chemical change while in the actual digestion process it is chemically broken with the help of digestive enzymes and saliva

Answer:

A). Lewis Acid

Explanation:

deez

The term that best describes the compound that accepts electrons from another substance to form a covalent bond is Lewis acid.

Lewis acid is a compound or ionic species which can accept an electron pair from a donor compound while a Lewis base is a compound such as the OH- ion, that can donate a pair of non-bonding electrons.

According to this question, a compound accepts electrons from another substance to form a covalent bond.

Therefore, the term that best describes the compound that accepts electrons from another substance to form a covalent bond is Lewis acid.

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Answer:

The answer is 24 miles.

Explanation:

Every hour he rides 8 hours. If he rides for three hours you can take 8 miles x 3 hours which is 24 miles.

The speed of the  riding is 8 miles/hours . Within a time of 3 hours Andy will go for a distance of 24 miles.

Speed is a physical quantity which measures the distance covered per unit time. The rate of speed is called velocity both having the units m/s, km/hr, miles/hr etc.

Speed is directly related to the distance covered. As the speed increases, distance covered by the object also increases. Whereas as the time increases, distance covered will decreases.

Given the speed of ride = 8 miles/s

time  = 3 hours.

Distance = speed × time.

               = 8 miles/ hr × 3 hours

               = 24 miles.

Therefore, Andy will reach out a distance of 24 miles within 3 hours when ride with a speed of 8 miles/s.

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Answer:

ex.1

1.The water in the test tube expands as it is heated. There is only one direction to expand in, the glass tube. This glass tube is narrow so that a small change in volume will result in a considerable change in height; your signal is amplified. This is the same phenomenon as in thermometers with a glass bulb on the lower end.

2. there will be a thermal expansion will happened.

Answer:

Scattering Sky looks blue due to Scattering of light from the dust particles. Molecules in the air scatter blue light from the sun more than they scatter red light.

Explanation: Due to its reflection

Answer:

DECREASES THIS IS OBVIOUS

Explanation:

Answer:

Beaker

Explanation:

just took on edge 2021

A volumetric flask tool is likely used in a procedure if the lab report shows that approximately 300 mL of water was used. Hence option A is correct.

The experiment name is titration. In this process of chemical analysis in which some quantity of some constituent of a sample is determined by adding to the measured sample exactly the known quantity of another substance.

Titration types: Acid-base titration, redox titration, precipitation titration, complexometric titration.

Uses:

A volumetric flask tool likely used in a procedure if the lab report shows that approximately 300 mL of water was used. Hence option A is correct.

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Answer:

Explanation:

An acid is a substance that can donate protons (H+) to water when dissolved in it, resulting in an increase in the concentration of H+ ions in the solution.

When NaCl (sodium chloride) is dissolved in water, it dissociates into its individual ions, Na+ and Cl-. These ions do not donate protons to water, so NaCl does not form an acid when dissolved in water.

NO2 (nitrogen dioxide) is a neutral compound, it does not donate protons to water and does not form an acid when dissolved in water.

H2SO3 (sulfurous acid) is an acid, when dissolved in water, it donates protons to water and forms H+ ions and SO3- ions.

HCl (hydrochloric acid) is an acid, when dissolved in water it donates protons to water and forms H+ ions and Cl- ions.

So the answer is H2SO3 and HCl are the compounds that would form an acid when dissolved in water as an aqueous solution.

First, let's see the proportion of the chemical equation:

8 moles of HNO₃ need to react with 3 moles of Cu.

You have 2.0 mol of HNO₃, so you can use the rule of 3 to find out how many moles of Cu you will need.

8 moles of HNO₃ ----- 3 moles of Cu

2 moles of HNO₃ ----- x moles of Cu

8x = 3 × 2

x = 6/8

x = 0.75 moles of Cu.

But you need to find how many grams. To find out, you need to know what the atomic mass of Cu. You can consult the periodic table to find out, the atomic mass of copper is 63.6 g/mol.

Now you need to transform moles into grams:

63.6 g of Cu ---- 1 mol of Cu

x g of Cu ---- 0.75 mol of Cu

x = 63.6 × 0.75

x = 47.7 g

Answer: It is needed 48 g of Cu to react with 2.0 mol of HNO₃.

Answer:

the electrical attraction between large numbers of cations and anions. Results from the sharing of electron pairs between two atoms. ... A covalent bond in which the bonded atoms have an unequal attraction for the shared electrons.

Explanation:

Answer:

a. 300 Kg of fertilizer

b. 225 Kg of fertilizer

c. 400 Kg of fertilizer

d. 600 Kg of fertilizer

Explanation:

The percentage composition ratio of Nitrogen, Phosphorus and Potassium in a 1 Kg bag of the given fertilizer is 40:15:10.

Therefore a  1 Kg bag contains;

40/100 * 1 Kg = 0.4 Kg of Nitrogen;

15/100 * 1 Kg = 0.15 Kg of phosphorus;

10/100 * 1 Kg = 0.1 Kg of potassium

Quantity of fertilizer required to add to a hectare to supply;

a. Nitrogen at 120 kg/ha = 120/0.4 = 300 Kg of fertilizer

b.. Nitrogen at 90 Kg/ha = 90/0.4 = 225 Kg of fertilizer

c. Phosphorus at a rate of 60 kg/ha = 60/0.15 = 400 Kg of fertilizer

d. Potassium at a rate of 60 kg/ha = 60/0.1 = 600 Kg of fertilizer

Answer:

Neutralization reactions occur when two reactants, an acid and a base, combine to form the products salt and water.

Explanation:

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Answer: Water and NaCl is always formed

Explanation:

I hope this helped!

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Chemical reactions nearly always include a change in energy between the products and reactants.

Thus, Energy is released when chemical bonds are created and is released when chemical bonds are destroyed.

The overall energy of a system, however, must remain constant according to the Law of Conservation of Energy, and chemical reactions frequently absorb or release energy in the form of heat, light, or both.

The difference in the amounts of chemical energy that are stored in the products and reactants accounts for the energy change in a chemical reaction. Enthalpy refers to the system's heat content or stored chemical energy.

Thus, Chemical reactions nearly always include a change in energy between the products and reactants.

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In dynamic equilibrium conditions, the vapor pressure is unique, and the rate of vaporization and condensation are at equal rates. Thus, option b is accurate.

A dynamic equilibrium is a reaction state where the rate of the forward and the backward reaction are equal. In the above case, the vapourization and the condensation will occur simultaneously at the same rate.

The vapor pressure of the liquid to gas and vice versa has a distinctive value as the temperatures are different making the pressure change directly.

Therefore, option b. II and III are the correct options.

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1. Convection currents are caused by Differences in water density.

2. Feeling heat from a campfire is an example of   heat transfer through convection.

3. Heat always flow from a warmer object to a cooler object.

4. The best description of convection is Heat transfer through movement in fluids.

Differential heating leads to convection currents. Warm, less dense, lighter material rises while cool, more dense, heavier material sinks. Convection currents are patterns of circulation that are produced by this movement in the Earth's mantle, oceans, and atmosphere.

The transfer of heat between two bodies by currents of moving gas or fluid is known as convective heat transfer. In free convection, air or water rises and is replaced by a cooler parcel of air or water as it moves away from the hot body.

Heat energy will always transfer from the warmer object to the cooler object under normal circumstances and in nature. Up until the two substances reach the same temperature, heat energy will transfer between them. The term "thermal equilibrium" describes this.

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The chlorine and sodium atoms in this configuration form a crystal lattice, a crystal structure made up of powerful ionic bonds.

The symmetrical, three-dimensional structural configuration of points representing atoms, ions, or molecules that make up a crystalline solid is known as the crystal lattice.

It can be characterized as the spatial geometrical arrangement of the atoms, ions, or molecules that make up the crystalline solid.

The cubic lattice of rock salt, NaCl, which has half of its lattice points occupied by sodium atoms and half by chlorine atoms, is one of the most prevalent structures.

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From Hund's rule, we can now see why the two 2p orbital electrons occur singly and are not paired in one orbital.

According to the Hund's rule, we know that before, we can pair the electrons that are present in the atoms of an element, the electrons must first of all occur singly or have the maximum parallel spins before they are pair.

In this case, we have an electron that has six electrons. The electron configuration of the element has been shown in the image attached. we can see that there are two electrons that singly occupy the 2p orbitals.

This serves to validate the Hund's rule.

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Answer:

We have an electron that has six electrons, and there are two electrons that singly occupy the 2p orbitals. According to Hund's rule, electrons arise singly in an atom before pairing occurs.

Explanation:

Answer:

These three are correct:

The kinetic energy of a substance is proportional to temperature.

The potential energy of a substance depends on its composition.

Chemical systems contain both kinetic energy and potential energy.

Explanation: