CHEMISTRY HIGH SCHOOL

EnergyThe energy needed to remove an electron from an atom is called
electronegative
valence
ejection
ionization

Answers

Answer 1
Answer:

Answer:

Ionization energy

Explanation:

Think of it this way: ions are elements with positive or negative charge. If we remove an electron, we give the element a positive charge and it becomes a cation (positive ion). Ionization energy is the energy required to do so - the more electronegative the element, the closer it holds its electrons, the harder they are to remove and the more energy you need.
Answer 2
Answer: Ionization energy is your answer I just took the test and passed

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A solution of KCIO3 is prepared using 75 grams of the solute in enough water to make 0.250 liters of solution. The gram-formula mass of KCIO3 is 122 grams per mole.-- Determine the percent by mass of solute in the solution.
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Define the law of conservation of charge and provide an example.Define opposite charges attract and like charges repel and provide an example.

Define Electricity along with an example.

Answers

Answer:

Conservation of Charge is the principle that the total electric charge in an isolated system never changes. The net quantity of electric charge, the amount of positive charge minus the amount of negative charge in the universe, is always conserved.

Gasoline is a mixture composed primarily of hydrocarbons such as isooctane, which is also known as 2,2,4-trimethylpentane.Gasoline is assigned a number called an octane rating. Gasoline with an octane rating of 87 performs the same as a mixture that consists of 87% isooctane and 13% heptane.
An alternative fuel, E-85, can be used in some automobiles. This fuel is a mixture of 85% ethanol and 15% gasoline.

State the octane rating of a gasoline sample that performs the same as a mixture consisting of 92% isooctane and 8% heptane.
Identify the functional group in a molecule of ethanol in the alternative fuel E-85.

Answers

Because of the 92% isooctane, the gasoline sample's octane rating is 92.The functional group in ethanol is the hydroxyl group.

22 The compounds CH3OCH3 and CH3CH2OH have different functional groups. Therefore, these compounds have different(1) chemical properties
(2) gram-formula masses
(3) percent compositions by mass
(4) numbers of atoms per molecule

Answers

Answer:

(1) chemical properties

Explanation:

CH3OCH3 is dimethyl ether while CH3CH2OH is ethanol.

Both compounds have the same molecular formula i.e. C2H6O but different structural formula, therefore they are structural isomers. Since they have different functional groups i.e. ether (-OR) and alcohol (-OH), they will have different chemical properties.

The gram formula mass for both compounds is the same i.e. 46 g/mol. Based on their chemical formula, both will have the same percent compositions by mass as well as the same number of atoms per molecule.
(1) chemical properties is the correct answer.
These two compounds are also called isomers.
Hope this helps~

What is the molarity of a 2.4-liter solution containing 124 grams of HF?a. 2.6 M HF <----- my guess based on calculations
b. 6.2 M HF
c. 8.3 M HF
d. 15 M HF

Answers

Molar mass:

HF = 1 + 19 = 20.0 g/mol

Number of moles :

124 / 20.0 =>  6.2 moles

Volume = 2.4 L

M = n / V

M = 6.2 / 2.4

M = 2.6 M

Answer A

hope this helps!
The Answer is A as you said:

Molarity = (no. of moles)/(volume)

moles of HF = (mass)/(molar mass)
                    = (124)/((1 + 19))
                    = 6.2 mol

∴  molarity of HF = (6.2 mol)/(2.4 dm^(3) )
                           = 2.58 M
                           ≈ 2.6 M

Which of the following aqueous solutions will have the lowest vapor pressure at 25 degrees Celsius?a. 1.0 M CH4
b. 1.0 M NaCl
c. 1.0 M AlCl3
d. 1.0 M BaCl2

Answers

The choices experiences colligative properties. These set of properties depend on the amount of solute dissolved in a solvent. These properties include freezing point depression, boiling point elevation, osmotic pressure and vapor pressure lowering. From the choices, the correct answer is A.

Answer : The correct option is, (C) 1.0 M AlCl_3

Explanation :

According to the relative lowering of vapor pressure, the vapor pressure of a component at a given temperature is equal to the mole fraction of that component of the solution multiplied by the vapor pressure of that component in the pure state.

1.0 M means that the 1.0 moles of solute present in 1 liter of solution.

Formula used :

(\Delta p)/(p^o)=i* X_B

where,

p^o = vapor pressure of the pure component (water)

p_s = vapor pressure of the solution  

X_B = mole fraction of solute

i = Van't Hoff factor

As we know that the vapor pressure depends on the mole fraction of solute and the Van't Hoff factor.

So, the greater the number of particles of solute dissolved the lower the resultant vapor pressure.

(a) The dissociation of 1.0 M CH_4 is not possible because it is a non-electrolyte solute. So, the Van't Hoff factor will be, 1.

(b) The dissociation of 1.0 M NaCl will be,

NaCl\rightarrow Na^++Cl^-

So, Van't Hoff factor = Number of solute particles = Na^++Cl^- = 1 + 1 = 2

(c) The dissociation of 1.0 M AlCl_3 will be,

AlCl_3\rightarrow Al^(3+)+3Cl^(-)

So, Van't Hoff factor = Number of solute particles = Al^(3+)+3Cl^(-) = 1 + 3 = 4

(c) The dissociation of 1.0 M BaCl_2 will be,

BaCl_2\rightarrow Ba^(2+)+2Cl^(-)

So, Van't Hoff factor = Number of solute particles = Ba^(2+)+2Cl^(-) = 1 + 2 = 3

From this we conclude that, 1.0 M AlCl_3 has the highest Van't Hoff factor which means that the solution will exhibit the lowest vapor pressure.

Hence, the correct option is, (C) 1.0 M AlCl_3

True or False, A Bronsted-Lowry acid is a proton acceptor, while a Bronsted-Lowry base is a proton donor.

Answers

This statement is false. A Bronsted-Lowry acid is a proton DONOR and the Bronsted-Lowry base is a proton ACCEPTOR, Based on the Bronsted-Lowry definition, acids and bases are being classified whether they can donate or accept and proton. Bronsted-Lowry acid is a PROTON DONOR because it donates a proton to H2O and for the Bronsted-Lowry base, it basically accepts a proton from acids such as HCl. 
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