Answers
Mg-19:
#protons = 12
#neutrons = 7
#electrons = 12
Mg-40:
#protons = 12
#neutrons = 28
#electrons = 12
Related Questions
How many significant figures are in this number?
3x10^6
If it's right 30 POINTS !!!!!!!
Answers
Which of the following terms best describes the oxide of a metal?
Answers
Answer:
Zinc oxide is a metal oxide the term best describes the nature of zinc oxide is an amphoteric oxide.
Explanation:
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how does evelyn hear music?
Answers
The radioisotope radon-222 has a half-life of 3.8 days. How much of a 73.9-g sample of radon- (3 222 would be left after approximately 23 days?
Answers
Answer:
1.115 g
Explanation:
Applying,
R = R'[tex]2^{n/t}[/tex]................... Equation 1
Where R = original sample of radon-222, R' = sample of radon-222 left after decay, n = Total time, t = half-life.
make R' the subject of the equation
R' = R/([tex]2^{n/t}[/tex])............... Equation 2
From the question,
Given: R = 73.9 g, n = 23 days, t = 3.8 days.
Substitute these values into equation 2
R' = 73.9/([tex]2^{23/3.8}[/tex])
R' = 73.9/[tex]2^{6.05}[/tex]
R' = 1.115 g
Which two laws were discovered by Antoine Lavoisier and Joseph Proust?
Answers
If the pH = 6.5, what is the [H+]? *
3.16 x 10-7
3.16 x 10-6
O
3.16 x 10-5
Answers
Answer:
Key Concepts
The hydrogen ion concentration in a solution, [H+], in mol L-1, can be calculated if the pH of the solution is known.
pH is defined as the negative logarithm (to base 10) of the hydrogen ion concentration in mol L-1 pH = -log10[H+] ...
[H+] in mol L-1 can be calculated using the equation (formula): [H+] = 10-pH
More items...
Explanation:
Answer:
[tex]pH = - log[H {}^{ + } ] \\ 6.5 = - log[H {}^{ + } ] \\ [H {}^{ + } ] = {10}^{ - 6.5} \\ [H {}^{ + } ] = 3.16 \times {10}^{ - 7} \: mol {dm}^{ - 3} [/tex]
What is Geothermal Energy?
Answers
Answer:
Geothermal energy is basically the thermal energy generated and stored in the Earth. It is the energy that determines the temperature of matter.
Explanation:
I hope this helped :)
Answer:
Geothermal energy is heat that's inside of the ground. It is a renewable energy source because heat is constantly being produced inside of the earth.
Explanation: Hope this helps! :)
what rule/principle states that electrons fill orbitals from lowest energy to highest enegery?
Answers
Answer:
The Aufbau Principle
Explanation:
In the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy level before occupying higher-energy levels.
Answer:
Aufbau principle
Explanation:
edge 2021
The metric system is also known as the
Answers
Answer:
THE answer is all of above
Explanation:
1. _C2H5OH + _O2 = _CO2 + _H2O
2. _Zn + _CuSO4 = _ZnSO4 + _Cu
3. _Ca + _AICI = _CaCl2 + _Al
4. _Hg(OH)2 + _H3PO4 = _Hg3(PO4)2 + _H20
5. _H3PO3 +_H3PO4 + _PH3
6. _C25H52 + _O2 = _CO2 + _H20
7. _Au2O3 = _Au + _O₂
8. _KBr + _Cl2 = _KCI + _Br2
9. _C4H10 + _O₂ = CO₂+ _H₂O
10. P4 + O2 = P₂O5
Answers
Answer:1. Ethanol + Dioxygen = Carbon Dioxide + Water
Explanation:
Por qué razón se fomenta la inmigración Europea?
Answers
Hola aquí va la respuesta!
Se fomentó la inmigración europea porque la economía no era buena y vinieron a Paraguay para mejorar su situación.
Hola aquí va la respuesta!
Se fomentó la inmigración europea porque la economía no era buena y vinieron a Paraguay para mejorar su situación.
Can anyone solve this for me please.
I appreciate anyone that is helping me with these questions
Answers
#2 is d
#3 is b
#4 is a
#5 isC
#6 is C
#7 is b
Now im not totally sure but these are my best answers for u. Hope ya ace ✨ stay safee
Use the equation below to answer the following question
2NaHCO3(aq) + Ca(H2PO4)2 (aq) → Na2HPO4 (aq) + CaHPO4 (aq) + 2002 (8) + 2H20 (0)
The theoretical yield of CHPO, is 10 g. If 8 g of CaHPO4 are produced from the reaction shown above, what is the percent yield of CHPO ?
Answers
Answer:
Percent Yield = 80%
Explanation:
Percent yield of a reaction is defined as one hundred times the ratio between the actual yield and the theoretical yield. That is:
Percent yield = Actual Yield / Theoretical Yield * 100
Where theoretical yield of CaHPO4 is 10g and actual yield is 8g
Replacing:
Percent yield = 8g / 10g * 100
Percent Yield = 80%Group 1 period 3 on periodic table
Answers
Answer:
unable to compute
Explanation:
what is the definition of an element
Answers
Answer:
A substance that cannot be broken down into simpler substances. An element is composed of atoms that have the same atomic number.
I hope it helps!
Explanation:
Answer:
pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei.
Explanation:
paraphrase it boi
calculate the molecular weight of CaCO3.
Answers
Answer:
Explanation:
CaCO3 = 1*Ca + 1*C + 3*O
=1*40 + 1*12 + 3*16
=40 + 12 + 48
=100 amu
What is the organelle that builds the protein molecules using the instructions from the genes?
1 Gene version
2 nucleus
3 ribosomes
4DNA
5 Golgi Bodies
Answers
Answer : Ribosomes
A carbon atom that is surrounded by four hydrogen atoms has a _____ molecular geometry. This geometry results from the arrangement of the _____ hybrid orbitals around the carbon atom. They are formed when the s-orbital and ______ -orbitals mix, or hybridize.
Answers
Answer:
Tetrahedral, sp3, p
Explanation:
C has 4 bonds and hence its tetrahedral shape with 109.5 degrees. since there are 4 bonds, it is sp3
Answer:
A carbon atom that is surrounded by four hydrogen atoms has a
✔ tetrahedral
molecular geometry.
This geometry results from the arrangement of the
✔ four sp3
hybrid orbitals around the carbon atom.
They are formed when the s-orbital and
✔ three p
-orbitals mix, or hybridize.
Explanation:
Suppose that we combined 75 g of magnesium with 45 g of nitrogen and heat them up. Predict the product of
the reaction, determine the limiting reactant, and calculate the theoretical yield.
Answers
Answer:
Mg is the limiting reactant
The theoretical yield is 105.2 g of Mg3N2
Explanation:
3Mg(s) + N2(g) -----> Mg3N2(s)
Number of moles of Mg = 75g/24g/mol = 3.125 moles
3 moles of Mg yields 1 mole of Mg3N2
3.125 moles of Mg yields 3.125 × 1/3 = 1.042 moles of Mg3N2
Number of moles of N2 = 45g/28g/mol = 1.607 moles
1 mole of N2 yields 1 mole of Mg3N2
1.607 moles of N2 yields 1.607 moles Mg3N2
Hence, Mg is the limiting reactant
The theoretical yield of Mg3N2 = 1.042 moles of Mg3N2 × 101 g/mol = 105.2 g of Mg3N2
What can be found in the Asteroid Belt?
Answers
Answer:
astrioids can be found at the astrioid belt
Answer:
Composition. Most of the asteroids in the Main Belt are made of rock and stone, but a small portion of them contain iron and nickel metals. The remaining asteroids are made up of a mix of these, along with carbon-rich materials. Some of the more distant asteroids tend to contain more ices
(True or false) The water molecule can be either an acid or a base. Justify.
Answers
Answer:
TRUE!!!!
Explanation:
Water can act as both an acid and a base in solution and undergoes autoionization, where it can be both an acid and a base to itself. When mixed with an acid, water accepts hydrogen ions and acts as a base. However, when water is mixed with a base, it donates hydrogen ions and acts like an acid.
Not my words! I hope this helps :)
Which salt is produced when NH4OH reacts with HNO3?
KNO2
NaNO3
NH4NO3
NH4NO2
Answers
The salt produced in the neutralization reaction between NH₄OH and HNO₃ is NH₄NO₃ (ammonium nitrate).
What is a neutralization reaction?A neutralization reaction is a reaction between an acid and a base to form salt and water. The cation of the salt will come from the base while its anion will come from the acid.
Let's consider the neutralization reaction between NH₄OH and HNO₃. The formed salt will be ammonium nitrate.
NH₄OH + HNO₃ ⇒ NH₄NO₃ + H₂O
The salt produced in the neutralization reaction between NH₄OH and HNO₃ is NH₄NO₃ (ammonium nitrate).
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Which of the following correctly ranks the following bonds in order from most to least polar?
C-H, N-H, O-H, F-H
a)
O-H > F-H > N-H > C-H
b)
F-H > N-H > O-H > C-H
c)
C-H > N-H > O-H > F-H
d)
F-H > O-H > N-H > C-H
Answers
Answer:
O-H F-H N-Hy
Explanation:
C-H N-H O-H F-H
Please! I need help
Describe how water molecules can hydrate various substances.
Answers
Answer:
The two hydrogen atoms and one oxygen atom within water molecules (H2O) form polar covalent bonds. ... As a result of water's polarity, each water molecule attracts other water molecules because of the opposite charges between them, forming hydrogen bonds.
Explanation:
Not my work, but I hope this helps!
After a 4.626g sample of silver oxide is heated, 4.306g of silver metal remains. What is the empirical formula of the compound?
please help me :(
Answers
Answer:
The empirical formula is Ag2O.
The empirical formula is Ag2O.Explanation:
The empirical formula is Ag2O.Explanation:The empirical formula is the simplest whole-number ratio of atoms in a compound.
The empirical formula is Ag2O.Explanation:The empirical formula is the simplest whole-number ratio of atoms in a compound.The ratio of atoms is the same as the ratio of moles. So our job is to calculate the molar ratio of Ag to 2O.
do the steps ...
To get this into an integer ratio, we divide both numbers by the smaller value.
From this point on, I like to summarize the calculations in a table.
ElementAgMass/gXMolesXllRatiomllIntegers
mAgXXXm7.96Xm0.07377Xll2.00mmm2
mlOXXXXl0.59mm0.0369Xml1mmmml1
There are 2 mol of Ag for 1 mol of O.
Answer:
Hello There!!
Explanation:
The answer is↬The empirical formula is Ag2O. It is the simplest whole-number ratio of atoms in a compound.
hope this helps,have a great day!!
~Pinky~
what is the slope of the line segment
-3
-1/3
1/3
3
Answers
Answer:
slope = 3
Explanation:
[tex]slope = \frac{3 - 0}{1 - 0} \\ = 3[/tex]
A 25 Ω resistor has a voltage drop of 12 V across it. Calculate the current flowing through the resistor
Answers
Answer:
0.48
Explanation:
[tex]i = \frac{v}{r} [/tex]
because we are looking for I which is current we say
I = 12÷25 which is 0.48.
The current flowing through the resistor is 0.48 A.
What is resistor?The resistor is a length of wire which resists the flow of current.
According to Ohm's law, the potential difference is proportional to the current flowing in the circuit.
V =I R where R is the resistance.
Given is the resistance of resistor R = 25Ω and the voltage drop V =12 Volt, then the current through the resistor will be
I =V/R
I = 12/25
I =0.48 A
Thus, the current in resistor is 0.48 Amperes.
Learn more about resistor.
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Which statement describes one way that nuclear fission differs from nuclear fusion?
Answers
Answer:
Nuclear fission is used to produce electrical power.
Explanation:
Both types of nuclear reaction require high temperatures
Answer:
D
Explanation:
Calculate the mass of hydrogen in 250 grams of C2H6
Answers
Answer:
50.28 grams
Explanation:
hope this helps
How many atoms of NaCl are present in 11.0 moles?
58 atoms
642 atoms
6.62 x 1024 atoms
3.51 x 1025 atoms
Answers
Answer:
6.62 × 10²⁴
Explanation:
wanna have fun?
The number of NaCl present in the 11 moles is equal to 6.62 × 10²⁴ NaCl. Therefore, option (C) is correct.
What is Avogadro's number?Avogadro’s number is used to express the number of entities in one mole of a chemical substance. Generally, these entities can be ions, molecules, atoms, electrons, or protons, which depends upon the type of chemical reaction.
The value of Avogadro’s constant is experimentally found approximately equal to 6.022 × 10²³ mol⁻¹.
Given, the number of moles of the NaCl = 11.0 mol
The molar mass of the NaCl = 23 + 35.5 = 58.5 g/mol
One mole of NaCl has formula units of NaCl = 6.022 × 10²³
Then 11 moles of NaCl have formula units of NaCl = 11 × 6.022 × 10²³
= 6.62 × 10²⁴ NaCl
Therefore,6.62 × 10²⁴ formula units of NaCl are present in 11 moles of NaCl.
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