CHEMISTRY HIGH SCHOOL

In kinetics, the order of a reactionA)depends on the rate constant
B)can be deduced from the balanced equation for the reaction
C)must be measured experimentally
D)depends on the concentrations of reactants
E)is the inverse of the entropy of the system

Answers

Answer 1
Answer: I think it should be C.  You can't always look at the chemical equation of a reaction and tell what order the over all reaction will be.  To do this, you need to preform experiments that have some concentrations held constant while changing others to see how the concentrations affected the rate.  After enough trials with enough concentrations held constant and changed, you will be able to determine the order of each reactant which will give you the order of the overall reaction.

I hope this helps.  Let me know in the comments if anything is unclear.

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Calculate the number of moles56.75 g of Al(NO3)3
8.35 g of Al2(SO4)3
3.8 g of FeSO4

Answers

number of moles = mass /molar mass

To make a 2.0-mole solution, how many moles of solute must be dissolved in 0.50 liters of solution?0.25 moles solute

0.50 moles solute

1.0 mole solute

2.0 moles solute

Answers

To make a 2.0-molarity solution in 0.50 liters of solution
M = moles of solute / liter solution
2 molarity = moles of solute / 0.5 liters of solution
moles of solute = 1 moles of solute

Answer : The correct option is, 1.0 mole

Explanation : Given,

Molarity of solution = 2.0 mole/L

Volume of solution = 0.50 L

Molarity : It is defined as the number of moles of solute present in one liter of solution.

Formula used :

Molarity=\frac{\text{Moles of solute}}{\text{Volume of solution}}

Now put all the given values in the above formula, we get the moles of the solute.

2.0mole/L=\frac{\text{Moles of solute}}{0.50L}

\text{Moles of solute}=1.0mole

Therefore, the number of moles of solute dissolved in the solution will be, 1.0 mole

Which element has the greatest electronegativity? fluorine chlorine bromine iodine

Answers

Answer: Option (a) is the correct answer.

Explanation:

It is known that for non-metals, on moving down a group there will be decrease in electronegativity of elements.

Smaller is the size of a non-metal, more easily an electron will be attracted by its nucleus. Whereas larger is the size of element more is the number of electrons present in the atom.

Hence, more will be the number of shells and attraction between the nucleus and outermost electrons will decrease. As a result, an electron will not easily get attracted by a larger atom.

Thus we can conclude that fluorine is the element that has the greatest electronegativity.
Fluorine has the greatest electronegativity

An atom in the ground state contains 8 valence electrons this atom is classified as a

Answers

Noble Gas. Metals have 1 or 2 Valence Electrons. Halogens have 7 Valence Electrons. Semi-Metals can have different amounts.

Answer:

Noble gas

Explanation:

With the exception of helium, all elements in Group 18 contain 8 electrons in the outermost shell; these are the noble gases.

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In a combustion reaction of C3H8 + 5O2 = 3CO2 + 4H2O, how do you know that the first compounds will produce the nuber of what they did? . Also how do you know that this 2Ca + O2= 2CaO?

Answers

To balance chemical equations, you should just remember that the number of atoms of an element in the reactant side must be equal to the number of atoms of the same element in the product side. The order of the substances doesn't matter. What is important that the equation balances.

What determines the order of placement of the elements on the modern Periodic Table?(1) atomic number(2) atomic mass(3) the number of neutrons, only(4) the number of neutrons and protons

Answers

The order of placement of the elements on the modern Periodic Table is determined by their atomic number (option A)

What is atomic number?

The atomic number of an element is the number of protons in the nucleus of an atom of that element. It is a unique identifier for each element, and it is the primary factor that determines the chemical properties of an element.

The Periodic Table is arranged in horizontal rows, called periods, and vertical columns, called groups. The order of placement of the elements on the modern Periodic Table is determined by their atomic number.

Learn about atomic number here brainly.com/question/11353462

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The order of placement of the elements on the modern Periodic Table is the atomic number. The answer is number 1. The rest of the choices do not answer the question above. Atomic mass gives the number of mass of an atom. 
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