Calculate the pH values and the masses of dissolved compounds of the following solutions:

a) solution of HCl (M = 36.46 g/mol) with concentration 0,0025 M and volume 500 mL

b) solution of the base Ca(OH)2 (M = 74.09 g/mol) with concentration of 0,02 mol/L and volume 2 liters

The force and the product of mass and acceleration, ma , is used to describe the relationship between the mass of object and the amount of force acting to accelerate it.

The newtons second law states that : The force  ( F ) acting on a moving body is the product of mass ( m ) and the acceleration ( a).

the expression is given as :

F = ma

where,

F = net force acting on an object

m = mass of the object

a = acceleration

of the object

we can use this formula in three different ways:

1)  To calculate the force :

F = ma

2) To calculate the mass :

m = F / a

3) To calculate the acceleration :

a = F / m

Thus,  The force and the product of mass and acceleration, ma , is used to describe the relationship between the mass of object and the amount of force acting to accelerate it.

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Helium gains no stability by adding one H because it is already stable due to a complete valance shell or orbit.

To attain stability an atom will gain, lose, or share electrons to complete the outermost shell means the last shell. Helium atom has two electrons in the first orbit which completes the doublet rule so it is stable we know that noble gases are stable elements and we know that helium is also a member of a noble family. Nuclides are the most stable because it contains even numbers of both protons and neutrons which make them less radioactive. Nuclear stability is greater in nuclides that comprise even numbers of protons and neutrons or both.

So we can conclude that the helium atom does not need hydrogen to get stability.

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According to this question, a graduated cylinder contains 25.8 mL of water. 2 glass marbles weighing 6.5 g was dropped into the cylinder. The new water level reads 27.2 mL.

This means that the volume of the marbles can be calculated as follows:

27.2mL - 25.8mL = 1.4mL

The volume of the marbles is 1.4mL.

Density is a measure of the mass of matter contained by a unit volume. The density can be calculated by dividing the mass by the volume as follows:

Density = 6.5g ÷ 1.4mL = 4.64g/mL

The density of the marble is 4.64g/mL.

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(a) Fluorine= (2,7)

(b) Nitrogen=(2,5)

The correct empirical formula of the glucose molecule is [tex]CH_{2} O[/tex].

The empirical formula is the simplest formula of the compound. Let us note that the structural formula shows the arrangement of the atoms of the compound while the molecular formula shows the number of each of the atoms that is in the substance.

Now we know that the empirical formula determines the ratio of each of the atoms that are in a  compound as such the formula that is shown can not be the empirical formula of glucose as we can see in the question that is above here.

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Answer:

no. of moles = 0.0113

Explanation:

To calculate the number of moles of a substance given its concentration and volume, we can use the following formula:

[tex]\boxed{\mathrm{No. \ of \ moles = Concentration \times \frac{Volume}{1000}}}[/tex],

where concentration is mole/dm³ or M, and volume is in cm³ or ml.

In this question, we are told that:

• concentration = 0.250 M

• volume = 45.0 ml

Substituting these values into the formula above, we get:

No. of moles = [tex]0.250 \times \frac{45.0}{1000}[/tex]

                     = [tex]0.250 \times 0.045[/tex]

                     = 0.01125

                     [tex]\approx[/tex] 0.0113   (3 s.f.)

Therefore, the number of moles of C₂H₅OH is 0.0113.

The 0.0112 moles of C2H5OH are present in the 0.250 M solution of C2H5OH.

What is a mole?

Mole is used as a concentration unit in chemistry terms. One mole is equal to the mass of the given compound which is divided by the molar mass of the same compound.

Given:

M= 0.250M ( M stands for molarity)

Volume = 45.0 ml

The molar mass of  C2H5OH = 46.07 g/mol

Now, we use molarity formula M = Moles of the substance/volume in liter

Let say moles = x

Units of M = mol/L

Therefore, units of volume need to be converted in to Liters = 1L = 1000ml

By using molarity equation, X= 45.0*0.250/1000 = 0.0112 moles

Hence, the required number of moles of C2H5OH = 0.0112 moles.

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The volume of oxalic acid required for the reaction is 76.8 mL.

Neutralization reactions are reaction in which acids reacts with bases to form salt and water only.

The neutralization reaction between oxalic acid and NaOH is given in the equation below:

(COOH)₂ (aq) + 2 NaOH (aq) ---> (COONa)₂ (aq) + H₂O (l)

The mole ratio of oxalic acid to NaOH is 1 : 2

moles of NaOH = Moles of oxalic acid /2

Moles of NaOH = 35.2 mL * 0.546 = 19.2 mmoles

Moles of oxalic acid = 19.2 / 2 = 9.6 mmoles

Volume of oxalic acid required = 9.6 / 0.125

Volume of oxalic acid = 76.8 mL

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The wavelength of the x-rays is 1.094 * 10⁻⁵ pm.

The frequency of a wave is the number of complete oscillations completed by the wave per second. Its unit is Hertz.

The wavelength of a wave is the distance between successive points in phase in the wave. It is measured in units of meter.

The relationship between the wavelength and frequency of a wave is given below.

Wavelength = velocity of the wave / frequency

The frequency of X-rays = 3.0 * 10⁸ m/s

frequency of the wave =  2.74 × 10¹⁹ Hz

Wavelength = (3.0 * 10⁸ m/s) / (2.74 × 10¹⁹ Hz)

wavelength = 1.094 * 10⁻¹¹ m

wavelength = 1.094 * 10⁻⁵ pm.

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Any liquid has a 1 atmosphere vapor pressure at its boiling point.  At 90 degrees Celsius, water has a vapor pressure of 0.692 atm.

The weight exerted on a unit area of the surface where the tank is kept determines the pressure at the bottom of a tank that is holding water.

That is equivalent to:

pressure = weight/area,

weight = mass (m) × acceleration due to gravity, and

weight = mass (m) (g).

Thus, pressure is defined as m × g/area.

At 90 degrees Celsius, water has a vapor pressure of 0.692 atm.

simple pressure = e^(20.386 - (5132 / (temperature + 273)) , where vapor pressure exists represented in mmHg and temperature in kelvins.

P total = p1 + p2

The relationship between mole fraction and vapour pressure at constant temperature.

Any liquid has a 1 atmosphere vapor pressure at its boiling point. Water has a single atmosphere of vapor pressure at 100 degrees Celsius. As a result, the boiling point of water is 100 degrees Celsius.

Therefore, the correct answer is option b) 69 k pa.

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The titration formula is used when we have an equivalence point of neutralization between acid and base, the formula is:

Ma * Va = Vb * Mb

Where:

Ma = concentration of acid

Va = volume of acid

Mb = concentration of base

Vb = volume of base

This formula tells us the concentration and volume of an acid must be equal to the concentration and volume of a base in order to neutralize the reaction (this applies to strong acids and strong bases only)

Ma * Va = Vb * Mb

0.00100 * 27 = 225 * Mb

0.027 = 225Mb

Mb = 0.00012M

The total energy contain for a 100g sample of beans is 0.24 kcal.

What is energy contain?

the capacity for doing work. It may exist in  kinetic, thermal, electrical or chemical, nuclear, or  various forms. There are moreover, heat and work eg, energy in the process of transfer from one body to other.

Sol-

15 g protein x 4 cal/g = 60 cal

1.0 g fat x 9 cal/g =

9 cal

42 g carb x 4 cal/g =

168 cal

Total calories =

60 + 9 + 168 = 237 calories

237 cal x 1 kcal/1000 cal = 0.237 kcal

The significant figure would 0.24 kcal .

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Answer

To solve this excescise we use the ideal gas equation:

Where:

P is the pressure of the gas

V is the volume

T is the temperature

R is the ideal gas constant

n is the number of moles

As the balloon is a closed recipient n is the same in state 1 (T: 24°C) and state 2 (T: 48°C).

R is a constant so also remains the same.

The pressure is also a constant in this case as the only thing that we do to the balloon is heat it.

So therefore:

Now we calculate the volume at 48°C (V2):

As we can see as the temperature rises the volume of the gas increases because the molecules have more kinetic energt and they remain farther apart.

The answer then is the new volume of the balloon is 2.4L

Answer:  dinophyte

Explanation: its a type of protist. it is unicellular and has chloroplasts

Scientists discover a species that is unicellular and has chloroplasts.  It could be a dinophyte.

A single-celled eukaryotic group (Protists) called a dinophyte makes up the phylum Dinoflagellates. They possess chloroplasts and are single-celled.

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The electron affinity of the given elements in question is Cl>S>Co>K>He, in the order of highest to lowest.

What is electron affinity?

When an electron is added to a neutral atom to create a negative ion, the energy of the atom changes (in kJ/mole). This is how electron affinity is defined. Or, the probability that a neutral atom will capture an electron.

The electron affinity decreases when we go left to right in the periodic table. But, there is a exception that the nobel gases has extremely low electron affinity. Among the given elements He is nobel gas so it has very low electron affinity and for the other elements we will check which element is located in left most position in periodic table that element has the highest electron affinity.

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We have this reaction:

C + O2 ===> CO2

The compounds on the left of the arrow are the reactants, the ones on the right are called products.

Answer: Carbon and Oxygen are reactants

The heat released by the experiment, assuming that the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/g⋅°C is -194 KJ/mol.

Density is defined as mass of a material substance per unit of the volume. The equation for density is d = M/V, where d stands for density, M for mass, and V for volume.

Grams per cubic centimeter are a common unit of density measurement. For instance, the density of Earth is 5.51 grams per cubic centimeter, whereas the density of water is 1 gram per cubic centimeter.

The equation of the reaction is;

CaOH(aq) + 2HCl(aq) --------> CaCl2(aq) + 2H2O(l)

From the information provided in the question;

No. of moles of CaO = 1.23 g/ 56 g/mol = 0.022 moles

No. of moles of HCl =  0.500 M × 200/1000 = 0.1 moles

We now have to obtain the limiting reactant

From the reaction equation;

one mole of CaO reacts with 2 moles of HCl

0.022 moles moles of CaO reacts with  0.022 moles × 2 moles/1 mole

= 0.044 moles

Hence there is more than enough HCl so CaO is the limiting reactant.

Temperature rise of the reaction = 5.10 °C

Total volume of solution = 200.0 ml

Density of solution =  1.00 g/ml

Mass of solution = 200 g

Heat capacity of solution = 4.184 J/g·°C

We know that, heat absorbed by solution = heat released by the reaction

Heat absorbed by solution = mcθ

m = mass of solution

c = heat capacity of solution

θ = temperature rise

Substituting values;

ΔH = 200g × 4.184J/g·°C × 5.10°C

ΔH = 4.27 KJ

Therefore, heat released by the reaction;

ΔHrxn = (- 4.27 KJ)/0.022 moles

ΔHrxn = -194 KJ/mol

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Answer:

1. Protons and neutrons

2. Positive charge

Explanation:

A nucleus contains protons and neutrons. Protons have a positive charge and neutrons have a neutral charge. Neutral + positive would still be positive. So logically nucleus is positive charge.

Answer:

A satellite campus or branch campus or regional campus is a campus of a university or college that is physically at a distance from the original university or college area. This branch campus may be located in a different city, state, or country, and is often smaller than the main campus of an institution.

Answer:

about 2 g/cm

Explanation:

D = M/V

D = 44.3/22.1

D ≈ 2

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Mass in grams of 7.54 x10³⁰ formula units of magnesium chloride is 7.178 gram

Mass is the measure of amount of matter in a substance or an object and magnesium chloride is the chemical compound this salt are typically ionic halide being highly soluble in water

Here given data is

Molar mass of  magnesium chloride = 95.211 grams/mole

Number of mole of magnesium given =  7.54 x10³⁰

Therefore mass of magnesium chloride

Molar mass × number of mole

Mass = 95.211 grams/mole × 7.54 x10³⁰

Mass = 7.178 gram

Mass in gram is 7.178 gram

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Usually scientists will collide a large isotope such as Uranium-235 with a neutron. The collision results in several more nuclear fissions, also known as a chain reaction . This results in a HUGE release in energy!

Nuclear fission occurs when large isotopes such as uranium - 235 collide with neutron and split into two or more smaller atoms. and releases a large quantity of energy. in this process nucleus of atom split into two or more smaller nuclei . this result in huge release in energy and resulting in chain reaction.

Thus, Usually scientists will collide a large isotope such as Uranium-235 with a neutron. The collision results in several more nuclear fissions, also known as a chain reaction . This results in a HUGE release in energy!

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ANSWER

The amount of valence electron in an atom is equivalent to the group the atom is located

EXPLANATION

Valency is define as the combining power of an element. Valence electrons are electrons located at the outer most shell of an element.

Valence electrons tell us the group a particular element belongs to and also the chemical properties of the element.

For example, sodium atom

Sodium has the below electronic configuration

The structure above represents a sodium atom. The structure contains a single electron at the outer most shell of the atom. The single electron is called the valence electron of sodium. Hence, sodium belongs to group 1

Therefore, the amount of valence electron in an atom is equivalent to the group the atom is located

grams would be 47 mg of sodium based on conversion ratios.

a. 0.047

b. 0.00166 ounces

c. 0.000104 kg.

grams of mass

A gram is one gram.

47 mg is equivalent to 0.47 / 1,000 or 0.047 grams.

Since 16 ounces are equal to 453.6 grams of mass, 0.047 grams would be equal to 0.00166 ounces when divided by 453.6.

Weight in Pounds

Given that 1 pound weighs 453.6 grams, 0.047 grams would equal 0.000104 pounds.

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Answer:

We are asked to create a concept map with the terms:

• chemical bonds

• ionic bonds

• covalent bonds

• metallic bonds

• Molecules

• ions

As we can see we have a general topic which is chemical bonds.

Then we have 3 different types of bonds: ionic, covalent and metallic.

Finally, these types of bonds can form either molecules or an array of ions (in the case of metallic bonds.

In orther to understant it better we first list the deffinitions of these 3 types of bonding:

Covalent bonds: is a bond between two atoms that share a pair of valence electrons. This bond produces a molecule.

Ionic bonds: is a bond between a metallic element and a non metallic element. The first gives electrones to the other, resulting in a molecule.

Metallic bonds: these are bonds that result exclusevely in metal compound. Metals are crystalline solids, a huge array of atoms that share valence electrones.

Therefore we can array these concepts in the following map:

You are in charge of a plant that makes methyl bromide,CH₃Br this compound is used as a fumigant for nematodes the thermochemical equation for the reaction is: CH₃OH(aq) + Br⁻(aq) equilibrium reaction arrow CH₃Br(aq) + OH⁻(aq) ΔH = +78 kJ/mol you must maximize the yield of the product when run the reaction with excess CH₃OH

Thermochemical is the reaction in which energy and heat associated with chemical reaction or physical transformation

The yield is maximum because the reactant will allow more and more to build up the reaction and here given reaction is

CH₃OH(aq) + Br⁻(aq)

In which when run the reaction with excess CH₃OH then automatically the yield of the reaction is become maximize and in the reaction the reactant run in excess amount automatically the yield as well as the product are become more

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The arrangement of the in order of decreasing atomic size is as follows:

The atomic size of an atom is the diameter of the atom and is calculated as half the distance between the nuclei of two covalently-bonded nuclei of the atom.

The atomic size of elements increases down a group but decreases across a period.

The reason for this trend is that, on going down a group, an extra electron shell is added to the element below. However, across a period, the electron shell remains the same whereas the size of the positive nuclear charge increases, therefore, the atomic size of atoms in the same period decreases from left to right across the period.

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Complete question:

Arrange the following elements in order of decreasing atomic size.

Rank the atoms from the largest to smallest. To rank items as equivalent, overlap them: Al, Cl, Ar, P, and K.

The mass of MgCI₂ produced from 4.61 moles of chlorine is 437.95g

What is mole ?
In chemistry, a mole, sometimes spelled mol, is a common scientific measurement unit for significant amounts of very small objects like atoms, molecules, or other predetermined particles.

The mole designates 6.02214076 1023 units, which is a very large number. The mole for the International System of Units is this quantity, according to the General Conference on Weights and Measures (SI)

Mg(s) + Cl₂(g) → MgCI₂(s)

1mol Cl2 gives 1 mol MgCl2

4.61mol Cl2  gives 4.61 mol MgCl2

Mass of  1 mol of MgCl2 = 24+35.5*2 = 95g

Mass of  4.61 mol of MgCl2 = 437.95g

The mass of MgCl2 produced from 4.61 moles of chlorine is 437.95g
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Because amount has no effect on mass percentages, the mass percentage of carbon in 5, 50, and 500 g of sucrose is 42.1  %

The mass:
It also represents the body's inertia, or resistance to acceleration (change in velocity) when a net force is applied. The mass of an object dictates the strength of its gravitational attraction to other bodies.

The kilogram is the SI base unit of mass (kg). Mass is not the same as weight in physics, despite the fact that mass is frequently calculated by measuring the object's weight using a spring scale rather than a balance scale and comparing it directly with known masses. Because of the reduced gravity, an object on the Moon would weigh less than it does on Earth, yet it would still have the same mass.

Molecular formula of sucrose is C12 H22 O11

Molar mass of Sucrose , C12 H22 O11 is = ( 12 x 12 ) + ( 22 x 1 ) + ( 11 x 16 )   g/mol

                                                                = 342 g/mol

The molar mass of Carbon is 12 g/mol

342 g of C12 H22 O11  contains 12 x 12 g of C

5 g of C12 H22 O11  contains Y g of C

Y = ( 12x12x 5 ) / 342

  = 2.105  g of  C

mass % of C = (mass of C / mass of sucrose ) x 100

                    = (2.105 / 5 ) x 100

                    = 42.1  %

342 g of C12 H22 O11  contains 12 x 12 g of C

50.0 g of C12 H22 O11  contains Y g of C

Y = ( 12x12x 50 ) / 342

  = 21.05  g of  C

mass % of C = (mass of C / mass of sucrose ) x 100

                    = (21.05 / 50 ) x 100

                    = 42.1  %

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The absolute magnitude (brightness) of Antares is -5.28, and the absolute magnitude of procyon is 2.68 then antares star is more luminous and antares is closer

Magnitude is simply defined as the distance or quantity and absolute or relative direction or size in which an object move in the sense of motion called magnitude and here given data is

Absolute magnitude of Antares = -5.28

Absolute magnitude of procyon = 2.68

And here given according to the given magnitude the Antares has negative magnitude so it is star closer and also the more luminous star because the Absolute magnitude of procyon is in positive number so it is far away and not a luminous as well as closer star so the because of less magnitude the antares star is more luminous and antares is closer

Larger magnitudes correspond to fainter stars so here 2.68>-5.28 and that means Antares appear in closer star as well as more luminous

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The Kp for the reaction is 516.52.

When a chemical process reaches equilibrium, the equilibrium constant (often represented by the letter K) sheds light on the interaction between the reactants and products.

The equation is :

A (g) ⇌ 2 B (g)

The reaction in question is the reverse of 2 times the original

4 B (g) ⇌ 2 A (g)

K for the reverse reaction is 1/K forward

K for doubling the coefficients is K squared

Therefore K in the present condition is 1 / K2 of the original...

1 / (0.044)² = 516.52

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