Boron occurs naturally as two isotopes. What is the difference between these isotopes?

Answers

Answer 1

Answer:

Answer: The two isotopes of boron differs in mass number rather than atomic number.

Explanation:

Isotopes are defined as the chemical species that have same atomic number but differ in their mass number.

Boron is the 5th element of the periodic table and have 2 naturally occurring isotopes. The isotopes are : B-10 and B-11

For $_5^(10)\textrm{B}$ isotope:

Percentage abundance of this isotope = 20 %

Atomic number = 5

Mass number = 10

For $_5^(11)\textrm{B}$ isotope:

Percentage abundance of this isotope = 80 %

Atomic number = 5

Mass number = 11

Hence, the two isotopes of boron differs in mass number rather than atomic number.

Answer 2

Answer: "They have different numbers of neutrons and different mass numbers. Remember mass number is protons plus neutrons. The number of protons for an element will never change, however the number of neutrons can." I took the test, its D

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How many moles are equal to 89.23g of calcium oxide?

Answers

mass of calcium oxide equals 89.23 g

molar mass of calcium oxide equals 56 G / Mole

the formula which is used as much of CaO equals molar mass of CaO

now put all of the Given values in this formula, we would get the moles of calcium oxide.

moles of CaO= 88.23g over 56g/mole which would get you 1.593 moles

What does Hess’s law state?

Answers

Hess's law states that the energy change in an overall chemical reaction is equal to the sum of the energy changes in the individual reactions comprising it. In other words, the enthalpy change of a chemical reaction (the heat of reaction at constant pressure) does not depend on the pathway between the initial and final states. The law is a variation of the first law of thermodynamics and conservation of energy.

Answer:

C. The enthalpy of a reaction is the sum of the enthalpies of intermediate reactions.

Explanation:

The heat of any reaction ΔH∘f for a specific reaction is equal to the sum of the heats of reaction for any set of reactions which in sum are equivalent to the overall reaction.

Write a balanced complete ionic equation for the following reaction: AgNO3(aq) + LiBr(aq) → AgBr(s) + LiNO3(aq)

Answers

Answer:

That is balanced.

Explanation:

If the acetylene tank contains 37.0 mol of C2H2 and the oxygen tank contains 81.0 mol of O2, what is the limiting reactant for this reaction?

Answers

Answer: $O_2$ is considered as the limiting reagent for this reaction.

Explanation:

Limiting reagent is the reagent which limits the formation of the product.

Excess reagent is the reagent which is present in excess in a chemical reaction.

For the combustion of acetylene, the reaction follows:

$2C_2H_2(g)+5O_2(g)\rightarrow 4CO_2+2H_2O$

By Stoichiometry,

5 moles of oxygen gas reacts with 2 moles of acetylene.

So, 81 moles of oxygen gas will react with = $(2)/(5)* 81$ = 32.4 moles of acetylene.

As, the required amount of acetylene is less than the given amount. So, it is considered as an excess reagent and oxygen gas is the limiting reagent.

Answer:

Oxygen is the limiting reactant of this reaction.

Explanation:

$2C_2H_2+5O_2\rightarrow 4CO_2+2H_2O$

2 moles of acetylene reacts with 5 moles of oxygen.

Then 37 moles of acetylene will react with :

$(5)/(2)* 37.0 mol=92.5 moles$ of oxygen gas.

But only 81 moles of oxygen gas is present.

Then 81.0 moles of oxygen gas will react with:

$(2)/(5)* 81.0 mol=32.4 moles$ of acetylene.

And still acetylene will remain after.

So, from the above calculation we cans see that oxygen is present in limiting amount which will limit the reaction.Hence, the limiting reactant of this reaction is oxygen.

(02.03 LC)
What term is used to describe the lowest energy level of a particle? (5 points)

Answers

Explanation:

Answer and Explanation: Photon is the basic unit of light. The excited state refers to the state when any specified electron gained some energy from surrounding. In the ground state, the electron carries no energy and this refers to its lowest energy level.

The reactants in a chemical reaction contain 900 J of chemical energy. The products of the reaction contain 9000 J of chemical energy. Which statement best describes this chemical reaction? The reaction absorbs 9000 J of energy from the surroundings as it proceeds. The reaction releases 9000 J of energy to the surroundings as it proceeds. The reaction absorbs 8100 J of energy from the surroundings as it proceeds. The reaction releases 8100 J of energy to the surroundings as it proceeds. The answer is C

Answers

For the reaction to take place the energy of the reactants must reach to the energy level of the products:
we have 900 J in the reactants and 9000 J for the products so the reactants need 8100 J to reach to the value of energy of products (900 + 8100 = 9000)
So the correct answer is C. The reaction absorbs 8100 J of energy from the surroundings as it proceeds.

The reaction absorbs 8100 J of energy from the surroundings as it proceeds.

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