Question 1
Predict if the bonds formed between the following pairs of elements will be ionic, polar covalent, or
covalent.
Si and O
O and O
C and H
Li and F
Ba and S
Polar Covalent
Covalent
Covalent
lonic
loric

The mass of the ethylene glycol used is 14.26 g

The freezing point is the temperature at which a liquid is converted to a solid.

Given that;

ΔT = 0.0°C - ( -4.3°C) = 4.3°C

ΔT = 4.3°C

But we know that

ΔT = k m i

m = ΔT/k i

m = 4.3°C/1.86 °C/m * 1

m = 2.3 m

Now;

Let the mass of  ethylene glycol be m

Molar mass of  ethylene glycol = 62 g/mol

Mass of solvent = 100.0 g or 0.1 Kg

Then;

2.3= m/62/0.1

2.3 = m/62 * 0.1

m = 2.3 * 62 * 0.1

m = 14.26 g

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Answer:

1.76 * 6.02*10^23 = 1.05952*10^24

1.05952*2 = 2.11904 *10^24 oxygen and 1.05952*10^24 sulfur atoms

In 1.76 moles of SO₂, there are approximately 1.06 x 10²⁴ SO₂ molecules, 1.06 x 10²⁴ sulfur atoms, and 2.12 x 10²⁴ oxygen atoms. For determining the number of SO₂ molecules, sulfur atoms, and oxygen atoms in 1.76 moles of SO₂, we need to use Avogadro's number, which is approximately 6.022 x 10²³ particles per mole.

1 mole of any substance contains Avogadro's number of particles, which includes atoms or molecules. Therefore, to find the number of SO₂ molecules in 1.76 moles, we can multiply 1.76 moles by Avogadro's number:

Number of SO₂ molecules = 1.76 moles × Avogadro's number

Number of SO₂ molecules = 1.76 moles × 6.022 x 10²³ molecules/mol

Number of SO₂ molecules ≈ 1.06 x 10²⁴ molecules

Next, we can find the number of sulfur atoms and oxygen atoms in 1.76 moles of SO₂. In one molecule of SO₂, there is 1 sulfur atom and 2 oxygen atoms. So, the total number of sulfur atoms and oxygen atoms can be calculated as follows:

Number of sulfur atoms = Number of SO₂ molecules × 1 sulfur atom/molecule

Number of sulfur atoms = 1.06 x 10²⁴ molecules × 1 sulfur atom/molecule

Number of sulfur atoms ≈ 1.06 x 10²⁴ sulfur atoms

Number of oxygen atoms = Number of SO₂ molecules × 2 oxygen atoms/molecule

Number of oxygen atoms = 1.06 x 10²⁴ molecules × 2 oxygen atoms/molecule

Number of oxygen atoms ≈ 2.12 x 10²⁴ oxygen atoms

So, in 1.76 moles of SO₂, there are approximately 1.06 x 10²⁴ SO₂ molecules, 1.06 x 10²⁴ sulfur atoms, and 2.12 x 10²⁴ oxygen atoms.

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Explanation:

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Answer:

false mocktail is liquor yea

We can say that the volume of the object is directly proportional to its mass. As the volume increases the mass of the object increases in direct proportion. The gradient of the graph equals the density of the material.

In an exothermic reaction, the reactants have more energy than the products.

Q methane = Q water

Q = mcΔt

mass water = V x ρ = 1 L x 1 kg/L = 1 kg

298 K to 373K = 25 °C to 100 °C

c water = 75.2 J/mol K = 4.2 J / g °C = 4200 J/kg °C

Q water = 1 x 4200 x (100 - 25)

Q water = 315000 J

Q methane = Q water = 315000 J = 315 KJ

n (mol) methane = ΔH/Q = 890.4 / 315 = 2.83

PV = nRT

V = nRT/P

V = 2.83 x 0.082 x 298/1

V = 69.15 L

Answer:

two may be the answer (2)

Answer:

2

Explanation:

final velocity: 20

initial velocity: 0

time taken: 10

acceleration: ?

a=( v-u)÷2

a=(20-0)÷2

a=20÷2

therefore acceleration =2

%yield = actual/theoretical x 100%

%yield = 16/24 x 100%

% yield = 67%

The volume (in mL) of calcium hydroxide, Ca(OH)₂ needed for the reaction is 19.8 mL

2HCl + Ca(OH)₂ —> CaCl₂ + 2H₂O

From the balanced equation above,

MaVa / MbVb = nA / nB

(1.63 × 36) / (1.48 × Vb) = 2

58.68 / (1.48 × Vb) = 2

Cross multiply

2 × 1.48 × Vb = 58.68

2.96 × Vb = 58.68

Divide both side by 2.96

Vb = 58.68 / 2.96

Vb = 19.8 mL

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The mass in grams of 8.94×10²² formula units of CuF₂ is 15.07 g

6.02×10²³ formula units = 1 mole of CuF₂

But

1 mole of CuF₂ = 101.5 g

Thus,

6.02×10²³ formula units = 101.5 g of CuF₂

6.02×10²³ formula units = 101.5 g of CuF₂

Therefore,

8.94×10²² formula units = (8.94×10²² × 101.5 ) / 6.02×10²³

8.94×10²² formula units = 15.07 g of CuF₂

Thus, 8.94×10²² formula units are present in 15.07 g of CuF₂

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The study and understanding of the biological macromolecules impact our everyday life by making us know what to eat and the different processes which occur in the body.

These are cellular components of the body which are natural and vital for the growth and survival of organisms.

Examples include carbohydrates, protein etc which contain nutrients vital for our daily life.

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Given the heat of fusion of water is 6.02 kJ/mol, it takes 12.9 kJ of heat to melt 38.6 g of ice at 0 °C.

Fusion, commonly known as melting, is a physical process in which matter passes from the solid to the liquid state.

We have ice with a mass of 38.6 g at 0 °C. First, we will convert mass to moles using the molar mass of water.

38.6 g × (1 mol/18.02 g) = 2.14 mol

The heat of fusion (ΔH°fus) for water is 6.02 kJ/mol. The heat (Q) required to melt 2.14 moles of ice is:

Q = 6.02 kJ/mol × 2.14 mol = 12.9 kJ

Given the heat of fusion of water is 6.02 kJ/mol, it takes 12.9 kJ of heat to melt 38.6 g of ice at 0 °C.

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The enthalpy change for the reaction is 1215.75  kJ/mol.

The term enthalpy change is the energy that accompanies a reaction. Now we have the reaction;  4HNO3(g) + 2H2O(g) → 2N2H4(g) + 7O2(g)

ΔHf HNO3(g) = -134.31 kJ/mol

ΔHf  H2O(g)=     -241.83  kJ/mol

ΔHf N2H4(g) =  97.42 kJ/mol

ΔHf O2(g) = 0  kJ/mol

ΔHreaction = [(2 * 97.42) + ( 7 * 0)] -  [ (4 * -134.31 ) + (2 * -241.83 )

= 194.84 - (-537.25 - -483.66)

=1215.75  kJ/mol

The enthalpy change for the reaction is therefore 1215.75  kJ/mol.

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Answer:

CO contains polar covalent bond, because these atoms share unequal electrons.

Answer:

N₂

Explicacion:

Si la diferencia de electronegatividad es muy alta, por ejemplo entre un metal y un no metal, se forman enlaces iónicos

Distillation is the process which involves the separation of pure water from impure water.

This is a technique which is used to purify through the boiling and cooling processes in the laboratory and typically involves the use of a liebig condenser.

Pure water is usually collected at 100° celsius with the impurities remaining and filtered out during the process. This is therefore the most apporpriate way of separating pure water from impure water.

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The opportunity costs of working part-time while attending high school could be studying time, grades, and your own free time. It depends on the person, how they do in school, but if it were for me, I would say the benefits outweigh the costs. I have enough time to study and still get good grades in school.

Answer:

I don't know I'm rich student

Explanation:

sorry

Answer:

268 nm

Explanation:

The equation needed to find wavelength is:

E = hc / w

In this equation,

-----> E = energy (J)

-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)

-----> c = speed of light (3.0 x 10⁸ m/s)

-----> w = wavelength (m)

To find the wavelength, you can plug the given values into the equation and simplify. Then, you can convert meters to nanometers.

E = hc / w

7.41 x 10⁻¹⁹ J = (6.626 x 10⁻³⁴ J*s)(3.0 x 10⁸ m/s) / w     <---- Input given values

7.41 x 10⁻¹⁹ J = 1.9878 x 10⁻²⁵ / w                                   <----- Simplify

(7.41 x 10⁻¹⁹ J) x w = 1.9878 x 10⁻²⁵                                <----- Rearrange

w = 2.68 x 10⁻⁷ m                                                          <----- Simplify

 2.68 x 10⁻⁷ m           1 x 10⁹ nm
----------------------  x  ----------------------  = 268 nm
                                         1 m

Answer:

Explanation:

The equation says for every 3 moles of barium chloride you can make 2 aluminum chloride.

(8/3)*2 = 5.33 moles

The answer is .747

There are 5 main rules to determining what are and what are not significant figures.

NOTE: In any measurement, the last digit is always assumed to be estimated.

The number of significant figures retained may not exceed the least number of digits in either of the factors. There will always be the same number of significant figures in the answer as the factor with the least amount of digits.

Given:

[tex]9.635 /12.9 =?[/tex]

In the given problem, the number with the least amount of digits is 12.9. As we recall from above, all non-zero numbers are significant, therefore all of these numbers are significant. Hence, we should have 3 significant figures in our final answer.

Now we use a calculator to simply calculate the above and we obtain:

[tex]0.7468992248[/tex]

We want to have 3 significant figures, so we will take the first 3 significant figures in that answer, .746, and use that. We apply rounding properties and obtain our final answer of .747.

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Answer:

D = m/V

Explanation:

Density represents the following ratio:

Density (D) = mass (m) / volume (V)

In this formula, the volume is being divided from the mass. The typical units for mass is grams and the unit for volume is milliliters.

Hydrogen, iron, and gallium is the correct answer. Hence, option B is correct.

An electron is a negatively charged subatomic particle.

Let us take another look at the periodic table. The periodic table is composed of metals, metalloids and nonmetals.

Metals lose electrons more easily, that is why they form cations. Metals are found on the left-hand side of the periodic table.

As we move away from the left-hand side of the periodic table, the ability to form cations decreases as metallic character decreases and elements become more nonmetallic.

The noble gas helium rarely loses electrons. Fluorine would rather accept an electron to form a negative ion.

Hence, the elements hydrogen, iron and gallium are metals hence they lose electrons more easily.

Hence, option B is correct.

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Cell signalling is a process by which cells communicate with each other and transfer messages.

A molecule inside or on the surface of a cell binds to a specific substance and causes a specific effect in the cell.

Cell signalling is a process by which cells communicate with each other and transfer messages. When a signal molecule binds to a receptor protein, changes occur in the receptor proteins. Two changes are listed below:

1. The receptor protein undergoes conformational changes and acts as an enzyme.

2. The receptor protein that makes a second messenger molecule that leads the reaction further to other cells or molecules.

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The time taken for the object to reach to top of pile is 0.012 year.

The time taken for the object to reach to top of pile is calculated as follows;

time of motion = distance traveled/speed

time of motion = (1.1 x 10¹⁴ x 10³ m)/(3 x 10⁸ m/s)

where;

time of motion = 3.67 x 10⁵ sec = 0.012 year

Thus, the time taken for the object to reach to top of pile is 0.012 year.

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Answer:

splenda

Explanation:

Hechar azucar no es del todo una buena opcion ya que puede poducir caries

If a Plum with a mass of 35 g contains 30 Cal of nutritional energy, then a  person should consume four plums to get 120 Cal of energy.

Finding the product of two or more numbers in mathematics is done by multiplying the numbers.

It is one of the fundamental operations in mathematics that we perform on a daily basis.

As given in the problem If a Plum with a mass of 35 g contains 30 Cal of nutritional energy, then we have to find out a person should consume how much plums to get 120 Cal of energy.

30 cal of nutritional energy = 1 plum

1 cal of nutritional energy = 1/30 plums

120 cal of nutritional energy = 120/30 plums

                                               = 4 plums

Thus,  a  person should consume four plums to get 120 Cal of energy.

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The wavelength of these gamma rays will be  1x1[tex]10^{-13}[/tex] m.

How do you define wavelength?

The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point, while the trough is the lowest.

The wavelength is also defined as the distance between two locations in a wave that have the same oscillation phase.

The length of a wave is measured in its propagation direction. The wavelength is measured in meters, centimeters, nanometres, and other units since it is a distance measurement.

The relationship between the wave's wavelength, frequency, and speed is given as

wavelength = speed of light ÷ frequency

wavelength = [tex]\frac{3 X10^8}{3.0 X10^{21}}[/tex]

wavelength = 1x[tex]10^{-13}[/tex] m

Hence the wavelength of these gamma rays will be [tex]1 X 10^{-13}[/tex]m.

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Answer:

2.73

Explanation:

2.72815277835894

i used an online converter lol it is much faster. if you'd like a step by step guide comment and ill give you one :)