(c) Magnesium has atomic number 12.
Magnesium exists as magnesium-24, magnesium-25 and magnesium-26 atoms.
Explain, in terms of protons and neutrons, why these atoms are isotopes
of magnesium
(2)
PLEASE HELP URGENT
Answers
Answer: The magnesium 24, 25, and 26 atoms are isotopes because they all have the same number of protons but they have different mass numbers
Explanation: isotopes of an element have the same number of protons but different mass number. So for magnesium 24, the number of protons is 12 and the number of neutrons is 12.
For magnesium 25, the number of protons would still be 12 but the neutrons would be 13.
Magnesium 26, the number of protons would be 12 and neutrons number is 14
Related Questions
Which of the following is an acid?
a) Mg(OH)2
b) Al(OH)3
c) H2CO3
d) NH4OH
Answers
Answer:
C
Explanation:
a) is magnesium hydroxide
b) is aluminium hydroxide
c) is carbonic acid
d) is ammonium hydroxide
_______ mL = 500 cm^3
Answers
Answer:
500 mL
Explanation:
500 cm is equal to 500 mL
Please help me ASAP
Answers
In the tropical rainforests, birds have evolved to eat the brightly-colored fruits. The fruits have evolved their attractive color so the birds will eat them and spread their seed. What theory is this an example of? A artificial selection b coevolution c mutation d natural selection
Answers
Answer:
coevolution
Explanation:
Coevolution plays a key role in shaping the biodiversity on Earth. Coevolution is commonly defined as reciprocal evolutionary changes brought about by interactions between species, implying that interacting species impose selection on each other(Science direct).
We can see that the change that occurred in the plants of the tropical rainforests is closely related to their link to birds. The fruits evolved an attractive color so that birds, having evolved to eat the brightly-colored fruits, may eat them.
9.32 x 1024 atoms of NaOH
Answers
Explanation:
65463.68 atoms of NaOh I believe.. I really dont know sorry
Write a balanced molecular, ionic, and net ionic equation for the following reaction. Assume the reaction occurs in
aqueous solution.
K2(C2O4)(aq)+CaCl2(aq) to
2KCl(aq)+ Ca(C2O4)(s)
balanced?
Ionic Equation:
Net Ionic Equation:
Answers
Answer: The balanced molecular equation is:
[tex]K_2(C_2O_4)(aq)+CaCl_2(aq)\rightarrow 2KCl(aq)+Ca(C_2O_4)(s)[/tex]
The ionic equation is:
[tex]2K^+(aq)+C_2O_4^{2-}(aq)+Ca^{2+}(aq)+2Cl^-\rightarrow 2K^+(aq)+2Cl^-(aq)+Ca(C_2O_4)(s)[/tex]
The net ionic equation:
[tex]C_2O_4^{2-}(aq)+Ca^{2+}(aq)\rightarrow Ca(C_2O_4)(s)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The balanced molecular equation is:
[tex]K_2(C_2O_4)(aq)+CaCl_2(aq)\rightarrow 2KCl(aq)+Ca(C_2O_4)(s)[/tex]
Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.
The ionic equation is:
[tex]2K^+(aq)+C_2O_4^{2-}(aq)+Ca^{2+}(aq)+2Cl^-(aq)\rightarrow 2K^+(aq)+2Cl^-(aq)+Ca(C_2O_4)(s)[/tex]
The ions which are present on both the sides of the equation are potassium and chloride ions. and hence are not involved in net ionic equation.
The net ionic equation:
[tex]C_2O_4^{2-}(aq)+Ca^{2+}(aq)\rightarrow Ca(C_2O_4)(s)[/tex]
What volume will 0.75 mole of oxygen gas occupy at
STP?
1). 16.8 L
2). 20.0 L
3). 22.4 L
4). 33.6 L
Answers
Answer:
Answer: Number 1 16.8 L
Answer:
16.78 liters
Explanation:
Volume occupied by oxygen gas at STP is 16.78 liters
what type of chemical reaction is SrCl2 + F2 → SrF2 + Cl2
Answers
single replacement
example of a single replacement:
AB + C —> AC + B
Imagine a foreign mountain lion species is introduced into the ecosystem. How will it affect the other organisms?
Answers
Answer:
if a foreign lion species is introduced into the ecosystem then it can affect the ecosystem in anyway...
Explanation:
because there are chances that the lion might substitute the other predators present in that region.there are chances that the ecosystem may maintain the equillibrium.
HOPE IT HELPS PO(◍•ᴗ•◍)❤
AgNO3 ionic or covalent
Answers
Answer:
what i need more details
Explanation:
Answer:
Ionic
Explanation:
AgNO3 is also highly soluble in water. Ionic means that the compound is composed of ions.
What is the approximate value of the equilibrium constant K P for the change C 2 H 5 OC 2 H 5 ( l ) ⇌ C 2 H 5 OC 2 H 5 ( g ) at 25 ° C. (The equilibrium vapor pressure for this substance is 570 torr at 25 ° C.) 760 torr = 1 atm R = 0.0821 L * atm / (mol * K)
Answers
Answer:
Kp for this equilibrium ≅ 570
Explanation:
This is a situation where we have an heterogeneous mixture.
We get gas from liquid state:
C₂H₅OC₂H₅ (l) ⇌ C₂H₅OC₂H₅ (g)
In order to determine Kc → [C₂H₅OC₂H₅ (g)], in equilibrium
Liquid or solid do not count for Kc, neither Kp
Kp → Partial pressure of C₂H₅OC₂H₅ (g)
Kc or Kp at equilibrium do not depend on the amount of liquid, there is; although it cannot be null since otherwise there would be no reaction.
Kp for this equilibrium ≅ 570
(Value for partial pressure in the only gas).
In order to determine Kc we can replace data at this formula
Kp = Kc (R . T)^ ⁽ⁿ ⁻ ⁿ°⁾
Where n - n° is the difference between the moles of produced gas. We only have 1 mol.
Kp = Kc (298K . 0.082)¹
570 Torr / (298K . 0.082) → Kc
How many atoms for each element in this compound:
5ZnSO4
Zn =
S =
O=
How many TOTAL atoms? =
Answers
The number of atoms of each element are:
The number of atoms of Zn is 5 atom.The number of atoms of S is 5 atoms.The number of atoms of O is 20 atoms.The total number of atoms is 30 atoms.From the question given above, we obtained:
5ZnSO₄
The number of each atom of each element present can be obtained as follow:
Zn = 5 × 1
Zn = 5 atoms
S = 5 × 1
S = 5 atoms
O = 5 × 4
O = 20 atoms
Total atom = atoms of (Zn + S + O)
Total atom = 5 + 5 + 20
Total atom = 30 atoms
Learn more: https://brainly.com/question/19989604
Abel was running a fever of 107 degrees Fahrenheit, what was her temperature in degrees
Celsius?
Answers
which of these has 170 degree in fahrenheit and
Answer:
we know the formula to convert Fahrenheit to Celsius =(F-32)(5/9)
=(107-32)(5/9)
=(75)(5/9)=375/9=41.6degree Celsius
HELP PLZ ITS DUE IN 10 MIN "Jack's model includes one object consisting of two molecules and one object consisting of six molecules. He put 16 energy cubes in each object and stated that his model showed the two objects at equilibrium. Explain what is wrong with Jack's model."
(I know it looks long but basically I just need help with finding what's wrong with the model)
Answers
Answer: the molecules have different energy and the system is not in equilibrium
Explanation:
The model developed by Jack has the same energy for each of the two objects, but as each object is made up of a different number of molecules, in the system with more molecules, object 2, each one has approximately 2.4 less energy and the molecules of Object 1 have an E / 2 energy.
So when you book them together the molecules have different energy and the system is not in equilibrium
Jack presented the model as if the two objects were in energy balance, but this is not possible, as each object has a different number of molecules.
We can arrive at this answer because:
For the system presented in Jack's model to be in energetic balance, it would be necessary for the two objects present in the model to have the same number of molecules.This is because, with equal amounts of molecules, each object would be able to emit the same amount of energy.However, the object with fewer molecules tends to emit less energy than the object with more molecules.This allows for an uneven, unbalanced emission of energy in the system and this unevenness is not presented in Jack's model.
More information:
https://brainly.com/question/16164100?referrer=searchResults
PLS HELP!!! i have no idea what this could be
Answers
Answer:
121.5g
Explanation:
from the equation:
2mol of Al react to give 3 mol of Zn
i.e 81g of Al will give 3×81/2 = 243/2 = 121.5g
How does fog rising off water compare to plant growth?
Answers
The humidity in the air affects the evapotranspiration rate from the leaf surfaces. ... The use of fog and mist at this time can reduce the air temperature and increase the humidity within the plant canopy without saturating the plant medium. With more oxygen in the root zone, faster rooting occurs.
Which is a chemical property of sulphur?
A. It is a solid.
B. It is combustible.
O c. It is odorless.
D. It is yellow.
O E. It has density.
Answers
A, O and D
and its sulfur luv ♡ not sulphur
If the ecosystem is balanced, which populations should be the largest? Which should be the smallest?
Answers
Answer:
In a balanced ecosystem, the largest population is the PRIMARY PRODUCERS, and the smallest is the TERTIARY CONSUMERS. In a balanced ecosystem, the largest population is the PRIMARY PRODUCERS, and the smallest is the TERTIARY CONSUMERS. This answer has been confirmed as correct and helpful.
Explanation:
What information can a mineralogist learn from testing the mass and volume of a mineral?
Answers
covalent compounds contain
Answers
Answer: Covalent compounds have bonds where electrons are shared between atoms. Due to the sharing of electrons, they exhibit characteristic physical properties that include lower melting points and electrical conductivity compared to ionic compounds.
hope this helps!
Explanation:
4.91 M NaOH solution (density=1.04g/ mL)
Answers
3CuCl2 + 2Al = 2AlCl3 + 3Cu
Using the molar ratio between the limiting reactant (aluminum) and the product copper, determine the theoretical yield of copper.
Answers
Answer:
0.014 theoretical yield and 79% percentage yield
Answer:
0.014 theoretical yield and 79% percentage yield
:)
Explanation:
Why do engineers use metals in making
electrical wires
Answers
Answer:
Why is copper used for most electrical wiring? All metals have some amount of resistivity to electrical currents, which is why they require a power source to push the current through. The lower the level of resistivity, the more electrical conductivity a metal has
plzzz help and thank u
Answers
Answer:
sports reporter
Explanation:
wnba
How are seasons different North & South of the equator
Answers
Answer:
seasons experienced by the northern and southern hemisphere always differ by six months when it is summer in the northern hemisphere, it is winter in the southern hemisphere
Explanation:
Answer:
ohhhhhhh she -he was having a point
The engineering process defines the steps engineers take to create
technology. Which of these describes these steps in the correct order?
A. Identifying a need, researching the background of that need,
making a plan to meet the need, doing the work, evaluating the
results, looking for improvements
B. Identifying a problem, testing various solutions, researching side
effects of each solution, choosing a solution, looking to improve
the solution, planning how to test the solution
C. Identifying a problem, brainstorming solutions, researching the
background of each solution, testing solutions, choosing a
solution, production, making future improvements
D. Identifying a problem, making a solution, testing the solution,
mass production, making improvements
Answers
Answer:
A.
Explanation:
Common sense<3
Answer:
A. Identifying a need, researching the background of that need,
making a plan to meet the need, doing the work, evaluating the
results, looking for improvements
Explanation: A P EX
Molar mass is the molecular (formula) mass of any substance expressed in which unit?
A). moles
B). kilograms
C). liters
D). grams
Answers
D. grams
Molar mass:
The molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sampleIt is given by this formula:[tex]M=\frac{m}{n}[/tex] ; where m= mass of substance in g and n= number of moles.Molar mass is expressed in grams per mole.For example: Molar mass of oxygen is 16 g/mol , Molar mass of carbon is 12g/mol.Learn more:
brainly.com/question/837939
Single displacement (replacement)
Answers
Explanation:
Single displacement (replacement) is kind of reaction in which 1 atom of reactants only change in product.
What is the final, balanced equation that is formed by combining these two half reactions? 2 equations: first: upper C u right arrow upper C u superscript 2 plus, plus 2 e superscript minus. Second: upper N upper O subscript 3 superscript minus, plus 2 e superscript minus, plus 2 upper H superscript plus right arrow upper n upper O subscript 2 superscript minus plus upper H subscript 2 upper O.
Answers
Answer: [tex]Cu+NO_3^-+2H^+\rightarrow Cu^{2+}+NO_2^-+H_2O[/tex]
Explanation:
Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.
Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.
[tex]Cu\rightarrow Cu^{2+}+2e^-[/tex] (1)
Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.
[tex]NO_3^-+2e^-+2H^+\rightarrow NO_2^-+H_2O[/tex] (2)
Combining (1) and (2) we get:
[tex]Cu+NO_3^-+2H^+\rightarrow Cu^{2+}+NO_2^-+H_2O[/tex]
The balanced reaction equation for the reaction described in the question is; Cu + NO3^- + 2H^+ ------> Cu^2+ + NO2^- + H2O
What is a balanced reaction equation?
An equation is said to be balanced when the total number of atoms of each element on the right hand side of the reaction equation is equal to the total number of atoms of the same element on the left hand side of the reaction equation.
The balanced reaction equation for the reaction described in the question is; Cu + NO3^- + 2H^+ ------> Cu^2+ + NO2^- + H2O
Learn more about reaction equations: https://brainly.com/question/1170557
conduction or convection
1.When you put your hand above a pan filled with boiling water, does your hand warm-up because of convection or conduction?
2.If you touch the pan, does your hand warm-up because of convection or conduction?
3.Based on your answers, which type of heat transfer moves heat more easily and efficiently?
Answers
Answer:
1 radiation
2 conduction
3 radiation