PLEASE HELP
Use the periodic table to determine which of the following could be an isotope of bromine (Br). Check all that apply.
Z = 79, A = 196
Z = 35, A = 79
A = 79, N = 44
Z = 44, N = 44
Answers
Explanation:
The answer is:
z=35,A=79
and also
A=79,N=44
According to the statements of the question, atoms Z = 35, A = 79 (option B) and A = 79, N = 44 (option C) are isotopes of bromine.
Isotopes are atoms from the same element which has a different number of neutrons in their nucleus.
Bromine has an atomic number (Z) of 35 and an atomic mass (A) of 80. The number of neutrons of this atom is:
[tex] A = Z + N [/tex]
[tex] N = A - Z = 80 - 35 = 45 [/tex]
For an element to be an isotope of bromine, it must have the same Z (35) and a different value of N.
From the given options, the only one that has the same atomic number is option B (Z = 35, A = 79).
The number of neutrons of this isotope is:
[tex] N = A - Z = 79 - 35 = 44 [/tex]
Hence, option B is an isotope of bromine.
Option C is also an isotope because it is the same as option B, the number of neutrons is 44 and the atomic mass is 79. So, this isotope is the same as option B.
The other options, A (Z = 79, A = 196) and D (Z = 44, N = 44), are not isotopes of bromine because they are different elements, gold (Au) and ruthenium (Ru), respectively.
Therefore, options B and C are isotopes of bromine.
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Considering the direct relationship between pressure and temperature, the new pressure in the bicycle tire would be 63.01 psi
Gas lawThe general gas laws is given by:
P1V1/T1 = P2V2/T2
Where P1 = initial pressure V1 = initial volume T1 = initial temperature, P2 = final pressure, V2 = final volume, and T2 = final temperature.
In this case, P1 = 100 psi, V1 = 1, T1 = 19+273 = 292, P2 = ?, V2 = 1.4, T2 = 58+273 = 331
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Answers
Answer:
Oxidation: a type of chemical reaction where one or more electrons are lost.
Oxidation State / Number: a number assigned to an atom describing its degree of oxidation, meaning how many electrons it has gained or lost.
Reduction: a type of chemical reaction where one or more electrons are gained.
Oxidation-Reduction Reaction: a chemical reaction where oxidation and reduction occurs simultaneously
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If the molar mass of zinc is 65.39 g/mol. you have a 65.2g piece of zinc. how many moles of zinc are present?
Answers
Answer:
By dividing the two, we can determine the mol. And I have also inserteed the formula below
Explanation:
Moles of zinc present in the sample that have a mass of 65.2 g are 0.997 moles.
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Moles are used to calculate the amount of substance to measure the small entity. It is calculated as:
[tex]\rm moles = \rm \dfrac{mass}{molar\; mass}[/tex]
Given,
Molar mass of zinc = 65.39 g/mol
Mass of zinc = 65.2 g
Moles are calculated as:
65.2/65.39 = 0.997 moles
Therefore, 0.997 moles of zinc are present.
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Title of your comic strip: James thermal energy Adventure__________________________
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