5. Which equation represents a balanced chemical equation?
O CF4 + 2Br2 → CBr4 + 2F2
O N2 + 3F2 + NF3
OPA+ O2 + 2P203
O K+ Cl2 + 2KCI

Answer:

c. chemical and physical

[tex]\large\red{\underline{\textbf{Given:-}}}[/tex]

Answer:

WHR Boilers

Explanation:

I hope this helps.

Answer:

71.58%

Explanation:

Find the Mr of C₁₇H₁₉NO₃ :

(12 × 17) + 19 + 14 + (16 × 3) = 285

Mr of carbon in C₁₇H₁₉NO₃ :

12 × 17 = 204

Percent by mass of carbon = [tex]\frac{204}{285}[/tex] × 100 = 71.58%

Soil nutrients are minerals which are required for growth either small or relatively large quantities

Soil minerals are the metallic and non-metallic nutrients found in the soil which are required by plants for growth.

Based on plants requirements, the major nutrients are nitrogen, phosphorus and potassium.

Plants also require other nutrients like copper, zinc, sulfur, iron, etc., in smaller quantities.

Based on the results of the soil test:

The deficiencies and excesses can be corrected by selectively reducing the application of the excess soil nutrients and addition of the deficient nutrients.

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Answer:

Answer C

Explanation:

Chemical Bonds

Answer:

Specific heat is an intensive property (like density, color, etc.) that does not depend on the amount of a substance present. This allows substances to be identified using their specific heat. Imagine an unknown metal of known mass is heated to a known temperature.

Explanation:

Answer:

A. They repel more strongly than the bonding pairs, pushing the bonding pairs closer together.

Explanation:

Lone pairs are in simple terms just pairs of electrons on the atom. Negative does not attract negative so it repels from the bonds. I put it in the most simple terms possible. Like with magnets north and north don't attract. Same concept

Answer:

compound

Explanation:

because h is hydrogen, then O is oxygen

Answer:

its the 1st one at the top

Answer:

Coal

Explanation:

Coal is derived from ancient plant life and thus consists largely of organic compounds.

The example of the organic portion of the Earth’s outer layers is coal.

The earth is made up of many layer which are very important for human life and our planet earth.

The earth is basically made up of three different layers.

There are basically five layers of earth atmosphere.

Thus, the example of the organic portion of the Earth’s outer layers is coal.

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Answer:

About 3.81 grams.

Explanation:

We can use the ideal gas law. Recall that:

[tex]\displaystyle PV = nRT[/tex]

Note that the universal gas constant R has the value 0.08206 L-atm/mol-K.

Hence, convert the measured pressure to atms (1 atm = 14.7 psi):

[tex]\displaystyle 27.0\text{ psi} \cdot \frac{1\text{ atm}}{14.7\text{ psi}} = 1.84\text{ atm}[/tex]

Rearrange the equation to solve for n, the number of moles of vaporized triethylamine and evaluate. The temperature is (25.0 + 273.15 ) K = 298.2 K:

[tex]\displaystyle \begin{aligned} n& = \frac{PV}{RT} \\ \\ & = \frac{(1.84\text{ atm})(0.500\text{ L})}{\left(\dfrac{0.08206\text{ L - atm}}{\text{mol-K}}\right)(273.2\text{ K})} \\ \\ &= 0.0376\text{ mol N(CH$_2$CH$_3$)$_3$}\end{aligned}[/tex]

Convert from moles to grams:

[tex]\displaystyle 0.0376\text{ mol N(CH$_2$CH$_3$)$_3$} \cdot \frac{101.22\text{ g N(CH$_2$CH$_3$)$_3$}}{1\text{ mol N(CH$_2$CH$_3$)$_3$}} = 3.81\text{ g N(CH$_2$CH$_3$)$_3$}}[/tex]

In conclusion, there is about 3.81 grams of vaporized triethylamine in the lecture bottle.

We have already been introduced to solutions. Several chapters ago molarity (M) was introduced. Molarity is measured in moles per liter, or mol/L. A 0.30 M NaCl solution means that there is 0.30 mol NaCl in every liter of solution.

Often chemists have to make solutions; so, doing the calculations necessary to make a certain amount of solution become second nature.

For example:

Make 250 mL of a 0.30 M NaCl solution.

To make the solution we need to calculate the amount of NaCl to dissolve to make 250 mL of solution.

start with 250 mL

The solution is made by adding 4.38 g NaCl to a 250-mL volumetric flask. About 100 mL of water are added and when all the NaCl dissolves water is added up to the line on the volumetric flask.

But molarity is not the only unit we use; so, we need to be able to convert between different units...

Common units of concentration include

<==> <==><==>

% wt.

% vol

molarity (M)

molality (m)

mol fraction

That is, the mol fraction of "a" is the number of moles of "a" present divided by the total number of moles of material in the solution (including the solvent).

There is no simple formula for converting from one concentration unit to the next. In general the first step is to pick a convenient sample size. Then work to change each part of the concentration unit to the new unit. Do not try to do the conversion all at once.

For example,

HCl comes in bottles marked 37 % HCl by weight. The density of the solution is 1.200 g/cm-1. What is the molarity of the solution?

A conveneint sample size is 100 g of solution; convenient because 100 g x 37% = 37 g HCl.

This is the key...you must know the definitions for all the concentration terms

First, convert number of grams of HCl in your sample to number of moles in your sample (the 100 g of solution).

Second, convert g of solution to L of solution.

Third, divide moles by liters and you have molarity.

What is the molality of this solution?

Going from M to m. Since the concentration is in M a convenient sample size is 1 L.

OK, so the first conversion is not a conversion...there are 12 mol HCl present in 1 L of solution.

The second conversion is not as easy as it first appears. Let's use the density of the solution to perform a conversion from volume to mass.

This is NOT the mass that is used in molality. We just determined the mass of the solution; molality uses the mass of the SOLVENT!

The solution is made of a solvent and a solute. So, the mass of solvent can be found by subtracting the mass of the solute from the mass of the solution.

Answer: Uranium is not a problem in this case, as its radioactivity is very low. This is due to the long half-life. How much uranium will decay per second with a half-life of 700 million years? This is a very insignificant figure.

Answer:

A. True

Explanation:

A metallic bond is a type of chemical bond formed between positively charged atoms in which the free electrons are shared among a lattice of cations. In contrast, covalent and ionic bonds form between two discrete atoms. Metallic bonding is the main type of chemical bond that forms between metal atoms.

try stopping putting the car in park before fixing

The solution to the polynomial expression since the power of the variable is in the second degree is 6.29 × 10² cm

The power of a variable refers to the exponent of the variable and the highest power of a variable is the degree to which the variable is being raised. From the information given, the highest power of the variable is a polynomial.

Given that:

[tex]\mathbf{= 2.150 \times 10^2 \ cm + 7.34 \times 10^2 \ cm - 3.2 \times 10^2 \ cm }[/tex]

So, since the exponents are in the same power we are going to add them all together multiplied by their exponent.

i.e.

[tex]\mathbf{= (2.150 + 7.34 - 3.2) \times 10^2\ cm }[/tex]

[tex]\mathbf{= 6.29 \times 10^2\ cm }[/tex]

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Based on the potential ligands given, C2O42- and CO32- can form a maximum of two bonds to a metal

ion.

Ligands are ion or molecule that binds to a central metal atom to form a coordination complex.

Ligands are essential in many biological and enzyme complexes.

From the potential ligands given;

Therefore, the potential ligands, C2O42- and CO32- can form a maximum of two bonds to a metal

ion.

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The stability of atoms whose subshells are half-filled with electrons is due to equilibrium and symmetry.

The stability of an atom of an element depends on the number of electrons in its valence shell.

Atoms whose valence shells are completely filled are particularly stable atoms.

Similarly, subshells half-filled with electrons are particularly stable.

The stability of subshells half-filled with electrons can be explained based on equilibrium and symmetry.

A half-filled subshell distributes the energy of the electrons evenly and symmetrically such that the atom attians stability.

Therefore, stability of subshells half-filled with electrons is due to equilibrium and symmetry.

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The electronegativity of carbon is about 2.5 , and that of oxygen is about 3.5 , and naturally, (3.5−2.5=1.0)>0 . So, the electronegativity difference is greater for a C−O single bond than a F−F single bond.

Answer:

1.0

I hope my answer helps you.

2.9 L of oxygen are required to react with 5.8 L of hydrogen at STP to form water.

Hydrogen gas and oxygen gas combines in a molar volume ratio of 2 : 1 to form water.

The equation of the reaction is given as follows:

Thus, twice the volume of hydrogen is required with a given volume of oxygen to form water.

If 5.8 L of hydrogen is available for reaction at STP, the volume of oxygen required all be half of 5.8 L.

Volume of oxygen required = 5.8 / 2 = 2.9 L

Therefore, 2.9 L of oxygen are required to react with 5.8 L of hydrogen at STP to form water.

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Hess law can help us to obtain the enthalpy of a series of reactions by summation. The missing enthalpy of this reaction is −198kJ.

According to the Hess law of constant heat summation, the enthalpy of a sequence of reactions can be obtained as the sum of the enthalpies of all the reactions.

Now looking at all the reavtion written here in order to obtain the missing enthalpy, we conclude that the missing enthalpy is −198kJ.

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2SO2 (g) + O2 (g)→2SO3 (g), ΔH = −198 kJ.

Answer:

covalent

Explanation:

It is between two nonmetals so it is covalent. It would be ionic if it were between a metal and a nonmetal.

Carbon tetrachloride, CCl₄ is a colorless organic compound with a sweet smell and is used as a refrigeration fluid. The covalent bonding is seen in the carbon tetrachloride compound.

Covalent bonding is the chemical interaction that has been constituted of electron sharing between the atoms of the elements in the molecule or the compound.

This type of chemical bonding is seen when the difference between the electronegativities between the elemental atom is very small to initiate the electron transfer.

In carbon tetrachloride, carbon has 4 valence electrons whereas chlorine has 1 valence electron in its outer shells. The four Cl shares their electrons with the carbon atom to complete their octet.

Therefore, carbon tetrachloride shows covalent bonding.

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Answer:

0.56 M

Explanation:

We are given;

Mass of glucose solute is 50.50 g

Volume of solution is 500 mL

We are required to calculate the concentration of glucose.

We need to know that, molarity is the concentration of a solution in moles per liter.

Molarity = Number of moles ÷ Molar mass

The amount, in grams, of [tex]CO_2[/tex] that would be produced from the burning of 3.0 mol amyl alcohol would be 660.15 grams

From the equation of the reaction:

[tex]2C_5H_1_1OH + 15O2 ---- > 10CO_2 + 12H_2O[/tex]

The mole ratio of amyl alcohol to the  [tex]CO_2[/tex] produced is 2:10.

Thus, for 3.0 mol of amyl alcohol, 15 mol of  [tex]CO_2[/tex] would be produced.

Mass of 15 mol  [tex]CO_2[/tex] = 15 x 44.01 = 660.15 grams

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Acid Base reaction (Neutralization reaction)

it is the reaction between acid and base which neutralize each other to give salt and water.

example: Hydrochloric acid + Sodium hydroxide --------> sodium chloride + water

HCl + NaOH--------> NaCl + H2O

Answer:

Have some attraction towards each other

Explanation:

Gases deviate from the ideal gas behavior because their molecules have forces of attraction between them. At high pressure, the molecules of gases are very close to each other so the molecular interactions start operating and these molecules do not strike the walls of the container with full impact.

Hope this helps :-)

Have a great rest of your day or night!

Enjoy your studies and assignments

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ps. I do not own any of these answers so please don't give full credit to me