REG: ED 101/6/12062
Course Code:
.
1. Using appropriate chemical equations, explain stellav nucleosynthe
sis of elements; o Ne, Na and Mg ( 6 Marks).​

The frequency of the wave assuming it is light having compete distance as 4.17×10^7 m is 1.44×10^15 Hz

Wavelength:- It is defined as the distance between the two Consecutive Crest or trough. OR distance travelled by the wave to Complete one Complete Cycle.

The distance for completing two cycle is 4.17×10^7 m

so 2λ=4.17×10^7m

λ=2.085×10^-7m

Also f=c/λ

f=3×10^8/2.085×10^-7

f=1.44×10^15 Hz

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The volume of nonadecane that has a density of 0.7860 g/mL is 1573.2mL.

The volume of a substance can be calculated by dividing the mass of the substance by its density. That is;

Volume = mass ÷ density

According to this question, nonadecane has a density of 0.7860 g/mL and has 4.605 moles.

First we calculate the mass of nonadecane as follows:

mass = 4.605 mol × 268.518 g/mol

mass = 1236.53g

Volume = 1236.53g ÷ 0.7860 g/mL = 1573.2mL

Therefore, the volume of nonadecane that has a density of 0.7860 g/mL is 1573.2mL.

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The density of the object weighing 15.50 g  when placed inside the water having initial volume 12.5 mL and the final volume 16.0 mL is 4.42 g/mL.

Density is defined as the mass of a substance per unit of its volume. It is denoted by a Greek symbol ρ. Density is the mass of a substance divided by its volume. It is given by -

                                              ρ = m

                                                      v

where,

ρ = density

m = mass

v = volume

Given data :

Mass (m) = 15.50 g

Volume (v) = (Final volume - initial volume)

               v = 16.0 mL - 12.5 mL = 3.5 mL

Putting the values in above formula,

Density = mass  

                volume

Density = 15.50 = 4.42 g/mL

                  3.5

The density of object is found to be 4.42 g/mL

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Polarity is the distribution of electrical charge among the atoms connected by a chemical bond.

1. CH2CL- Carbon has an electronegativity of 2.5, hydrogen has a 2.2 electronegativity, and the chlorine atom has a 3.1 electronegativity. Their electronegativities differ by 0.3 for C-H and 0.6 for C-Cl. The fact that dichloromethane is a polar molecule is therefore confirmed.

2. CH3OH- The C-O bond has a difference in electronegativity of 3.44 - 2.55 = 0.89, which cannot be disregarded. The C-O bond is hence polar. The O-H bond is polar because the difference in electronegativity is 3.44 - 2.2 = 1.24.

3. OF2 - Two O-F covalent bonds can be found in OF2 O F 2. Oxygen has an electronegativity of 3.5. Fluorine has an electronegativity of 4.0. Therefore, there is a 0.5 discrepancy between the electronegativity values. Thus OF2 is polar.

4. CCl4 - Carbon tetrachloride (CCl4) is a non-polar molecule with µ=0

5. BF3 - It is more than 0.5 because the difference between the electronegativity values of B and F is equivalent to 1.94 (3.98 - 2.04 = 1.94). Therefore, each B-F bond in the molecule of boron trifluoride (BF3) is polar.

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Answer:

statement C is the correct answer

Answer: F,C,NA

Explanation:

bc it is

Answer:    es no metales

Explanation:

When we convert 120 meter to feet we obtain 393.6 feet.

Unit conversions is very important in science. It is important that we are able to express a value in different units as this is able to ease the process of making calculations.

We know that;

1 meter = 3.28 foot

120 meter = 120 meter * 3.28 foot/1 meter

= 393.6 feet

Thus, when we convert 120 meter to feet we obtain 393.6 feet.

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The mass of sulfur in a sample of CaSO4 with a mass of 65.8 g is 15.50g.

According to this question, a 10.4 g sample of CaSO4 is found to contain 3.06 g of Ca and 4.89 g of O.

This means that the mass of sulfur in the 10.4g of CaSO4 is 10.4g - (3.06g + 4.89g) = 10.4g - 7.95g = 2.45g

Next, we calculate the percent ratio of each element in the compound; CaSO4.

According to this question, a sample of CaSO4 with a mass of 65.8 g is given. The mass of each element in this compound is as follows:

Therefore, the mass of sulfur in a sample of CaSO4 with a mass of 65.8 g is 15.50g.

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The final water reading in the graduated cylinder if the density of copper is 8.96 g/mL is 16.79mL

Density is defined as mass per unit volume. Density and volume have a directly proportional relationship. That is, any change in volume causes a change in density and vice versa.

Find the final water reading in the graduated cylinder

[tex]D=\frac{M}{V}[/tex]

where,

D= density

M= mass

V= volume

volume due to copper pieces

V= M/D

V=12.91g/8.96

 =1.440

find volume = original volume + displaced volume

                    = 15.35 + 1.440

                    = 16.79mL

The final water reading in the graduated cylinder if the density of copper is 8.96 g/mL is 16.79mL

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The total kinetic energy of the gas sample is 3.3 KJ

This is the energy possessed by an object in motion. Mathematically, it can be expressed as:

KE = ½mv²

Where

Mass = mole × molar mass

Mass of fluorine gas = 1 × 38

Mass of fluorine gas = 38 g

KE = ½mv²

KE = ½ × 0.038 × 415²

KE = 3272.275 J

Divide by 1000 to express in kilojoule

KE = 3272.275 / 1000

KE = 3.3 KJ

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The mass (in dg) of the 24.5 mL of the substance having a specific gravity of 0.841 is 206.045 dg

We'll begin by obtaining the density of substance. This can be obtained as follow:

Density of substance = Specific gravity × density of water

Density of substance = 0.841 × 1

Density of substance = 0.841 g/mL

The mass of the substance can be obtained as illustrated below:

Density = mass / volume

Cross multiply

Mass = Density × Volume

Mass of substance = 0.841 × 24.5

Mass of substance = 20.6045 g

Multiply by 10 to express in dg

Mass of substance = 20.6045 × 10

Mass of substance = 206.045 dg

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Answer:

true I believe

Explanation:

Answer:

1 LITHIUM= 6.022140857×1023 atoms

0.50 LITHIUM =  3.01 × 102^3

ADD THEM TOGETHER AND YOU GET YOUR ANSWER.

Explanation:

Using simple multiplication, we can conclude that 1.5 is the numerical value of 1.2 × 1.222.

When solving mathematical analysis issues, numerical analysis is the study of methods that employ numerical approximation rather than symbolic manipulation (as distinguished from discrete mathematics). The study of numerical techniques aims to identify approximate rather than precise answers to issues.

Numerous engineering and physical science disciplines, as well as the life and social sciences, as well as commerce, the arts, and even medicine, use numerical analysis.

The use of more complex numerical analysis is now possible thanks to the rise in computing power, which also enables the creation of intricate and accurate mathematical models for use in engineering and science. Ordinary differential equations, which are used in celestial mechanics to forecast the motion of planets, stars, and galaxies, are examples of numerical analysis.

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0.072251

Explanation:

The Sig Figs would be 5 (0.072251)

In Decimals 6 (0.072251)

Scientific Notation 7.2251 × 10-2

E-Notation 7.2251e-2

Taking into account the definition of density, the density of the metal is 1.097 g/mL.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is:

density= mass÷ volume

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know that:

Replacing in the definition of density:

density= 4.5 g÷ 4.1 mL

Solving:

density= 1.097 g/mL

In summary, the density of the metal is 1.097 g/mL.

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Answer: 20.179 grams

I had to do a project on this recently, so here is your answer!

Hope this is helpful!

Answer:

2.894 x 10²⁴ atoms Ne

Explanation:

To find the amount of neon atoms, you need to (1) convert grams to moles (using the atomic mass) and then (2) convert moles to atoms (using Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator of the ratios in this case). The final answer should have 4 sig figs like the given value (100.0 = 4 sig figs).

Atomic Mass (Ne): 20.180 g/mol

Avogadro's Number:

6.022 x 10²³ atoms = 1 mole

 100.0 g Ne             1 mole             6.022 x 10²³ atoms
--------------------  x  -----------------  x  -------------------------------  =  2.894 x 10²⁴ atoms
                               20.180 g                    1 mole

According to the law of conservation of mass, the mass of CO₂ formed is 6.15 g.

The mass of  Carbon dioxide, CO₂ is produced from the given reaction between 15.00 g of CaCO3 powder and add it to 60.75 g of HCl solution is determined as follows:

The mass of the calcium carbonate, CaCO₃ reacting = 15.0 g

Mass of HCl solution reacting = 60.75 g

Total mass of reactants = 60.75 g + 15.0 g

Total mass of reactants = 75.75 g

On addition of the calcium carbonate to the HCl solution, bubbles of carbon dioxide gas, CO₂, were observed and the gas allowed to escape.

Equation of the reaction: CaCO₃ (s) + 2 HCl (aq) → CaCl₂ (aq) + H₂O (l) + CO₂ (g)

Mass of resulting solution = 69.60 g

According to the law of conservation of mass, mass of product = mass of reactant

Therefore, mass of CO₂ formed = 75.75 g - 69.60 g

mass of CO₂ formed = 6.15 g

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Explanation:

Refer to Activity 2 in Lab 3A to answer the question below

Two amino acids are shown below in the process of forming a peptide bond (labeled). The hydroxyl (-OH circled in red) is being removed from the carboxyl group of the first amino acid. A hydrogen

atom (-H circled in red) is being removed from the amine group from the second amino acid. The removed -OH and -H will form water (H20)

Question

What chemical reaction takes place when water is removed to form a bond (as is being shown below)?

Taking into account the definition of density, the volume of the quarter is 0.5952 mL.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density= mass÷ volume

In this case, you know that:

Replacing in the definition of density:

10.5 g/mL= 6.25 g÷ volume

Solving:

10.5 g/mL× volume= 6.25 g

volume= 6.25 g÷ 10.5 g/mL

volume= 0.5952 mL

In summary, the volume of the quarter is 0.5952 mL.

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Answer:

ddddddfrvtrnsyjemn

Explanation:

dddddddddddd

look at the screenshot

Intermolecular force is the force of attraction that holds the particles in the atom together. The force referred to in the question is the force that binds the various elements together when they come together.

The intermolecular forces presented in the answer options in order of strength to weakness are ion-dipole hydrogen bonds dipole-dipole and van der Waals forces. The dipole-dipole interaction is the strongest intermolecular attraction. These are the weakest intermolecular forces and exist between all types of molecules, whether ionic or covalent, polar or non-polar.

Solids usually have the strongest intermolecular forces compared to liquids and gases. In solids, they are incompressible and dense because the particles are close together. The weakest intermolecular force is the London dispersion force. London Dispersion Force The London dispersion force is also known as the induced dipole induced dipole because it is a temporary attractive force that generates a temporary dipole. London dispersion exists in nonpolar monatomic gases.

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Answer:

nonpolar substance < polar substance < ionic substance

Explanation:

Answer key

Answer:

Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei. The fission process often produces gamma photons, and releases a very large amount of energy even by the energetic standards of radioactive decay

Ions are simply referred to as electrically charged atoms. Ions are formed when atoms lose or gain electrons to become positively or negatively charged.

Positively charged atoms are called cations (+) while negatively charged atoms are called anions (-).

According to this question, ions are electrically charged that can be formed when a metal reacts with a non-metal.

Metals like calcium, pottasium etc. lose electrons to form positive ions or cations while non-metals such as nitrogen, oxygen etc gain electrons to form negative ions or anions.

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Answer: Ture

Explanation: A small standard deviation means that the data is more clustered around the mean (More reliable).

Answer:

The conversion factor is 0.001; so 1 cubic decimeter = 0.001 cubic meters. In other words, the value in dm3 divide by 1000 to get a value in m3.

Explanation:

The most important safety measure to follow when using an acid in a classroom laboratory is wearing gloves, wear face shield and protective clothing etc

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