Answer:
All elements in Group 18 are called noble gases and are nonreactive which means they don’t readily react with other elements.
Explanation:
An electrically neutral atom has an atomic mass of 30.973 and an atomic number of 15. How many neutrons does this atom have?_______________
Answer: 16 neutrons
Explanation: The atomic number for any element is the number of protons in its atomic nuclei. In a neutral atom, the number of electrons are the same as the number of protons. The atomic mass (mass number) is the sum of the protons and neutrons in the nucleus. Mass number can vary due to the fact that the number of neutrons can vary. Isotopes are named for their mass numbers.
So, this element has 15 protons (atomic number), 15 electrons, and 16 neutrons (mass number minus atomic number).
This isotope is phosphorus-31, which has atomic number 15.
How does thermal energy flow as you hold a glass of ice water?
explain why magnesium is a better conductor of electricity than sodium
Answer:
When magnesium ions are broken off the solid lattice and go into solution, there is enough attraction between the 2+ ions and the water molecules to get co-ordinate (dative covalent) bonds formed between the magnesium ions and lone pairs on surrounding water molecules… making it more conductive than sodium.
How much heat will be transferred when 0.54g of sulfur reacts with 0.54g of oxygen to produce sulfur trioxide according to the following reaction:
2 S + 3 O2 =2 SO3 + 790kJ
Answer:
-4.4 kJ
Explanation:
Which of these are enantiomers? There should be two.
How much volume will 8.8 moles of gas fill at 0.12 atm at 56*C
Answer:
2000 L
General Formulas and Concepts:
Atomic Structure
MolesTemperature Conversion: K = °C + 273.15Gas Laws
Ideal Gas Law: PV = nRT
P is pressureV is volume (in L)n is number of molesR is gas constantT is temperature (in K)Explanation:
Step 1: Define
[Given] 8.8 moles gas
[Given] 0.12 atm
[Given] 56 °C = 329.15 K
Step 2: Solve for V
Substitute in variables [Ideal Gas Law Formula]: [tex]\displaystyle (0.12 \ atm)V = (8.8 \ mol)(0.0821 \ \frac{L \cdot atm}{mol \cdot K})(329.15 \ K)[/tex]Isolate V: [tex]\displaystyle V = \frac{(8.8 \ mol)(0.0821 \ \frac{L \cdot atm}{mol \cdot K})(329.15 \ K)}{(0.12 \ atm)}[/tex]Multiply/Divide [Cancel out units]: [tex]\displaystyle V = 1981.7 \ L[/tex]Step 3: Check
Follow sig fig rules and round. We are given 2 sig figs.
1981.7 L ≈ 2000 L
Why does the first method for determining volume work only for a regularly shaped object?
Answer:
please give me brainlist and follow
Explanation:
when using first method for regular shape and 2nd method for an irregular shape. ... It will not work because the weight is different.
Explain how you could determine the number of moles of gas that are present in a 2L bottle that is open to the atmosphere. State what pieces of information you would need to have in order to complete the calculation, and what tools / equipment you could use in order make the measurements to gather the information. Explain how that information can then be used to determine the number of moles present in the bottle.
Answer:
it 2.0 aka b
Explanation:
PLEASE HELP ILL MARK BRAINLIEST ☹️!!
A 25.0 L tank contains hydrogen (H2) gas at a temperature of 149 K and a pressure of 1.51 atm. How many moles of hydrogen gas is in the tank?
Answer:
There are 3.08 moles of hydrogen gas in the tank
Explanation:
As we know
[tex]PV = nRT[/tex]
where P is the pressure of the gas in atm
V is the volume in liters
n is the number of moles
R is the gas constant = 0.08206 L·atm/K·mol
and T is the temperature in Kelvin.
Substituting the given values in above equation, we get -
[tex]1.51 * 25 = n * 0.08206 * 149\\n = 3.08[/tex]
There are 3.08 moles of hydrogen gas in the tank
The degree or intensity of heat present and how we measure heat is called:
Are the electron geometries of water and ammonia similar?
Answer:
See Explanation
Explanation:
The electron geometries of water and ammonia are both based on a tetrahedron. The central atom in ammonia is nitrogen which is surrounded by four electron pairs; three bond pairs and one lone pair. In water, the central atom is oxygen surrounded by four electron pairs also; two bond pairs and two lone pairs. The presence of four electron pairs on the central atom of each molecule means that their electron geometries are both tetrahedral according to Valence Shell Electron Pair Repulsion Theory.
However, due to the presence of lone pairs, the molecular geometry of water is bent(angular) while the molecular geometry of ammonia is trigonal pyramidal.
Which type of radiation poses the fewest safety issues?
A. Beta
B. Gamma
C. Alpha
D. X-rays
Answer:
C. Alpha
Explanation:
I did it and I got it right
Answer: C. Alpha
Explanation:
One of the most important uses for Grignard reagents is their addition to carbonyl compounds to give new carbon-carbon bonds.
a. True
b. False
Answer:
a. True
Explanation:
Hello there!
In this case, as Grignard reagents are widely used in organic-synthesis procedures, since they are compelling nucleophiles able to react with electrophiles such as carbonyl compounds (aldehydes, ketones, esters, carbon dioxide, etc) and epoxides; they are involved in the addition of new C-C bonds to an starting carbon chain; therefore, this statement is a. True.
Best regards!
The mass of evaporating dish
[tex]\huge{\textbf{\textsf{{\color{pink}{An}}{\red{sw}}{\orange{er}} {\color{yellow}{:}}}}}[/tex]
The mas.s of evaporating dish is 21.345g B.
ThanksHope it helpsWhich of the following molecules has a nonlinear structure?
Answer:
SnCl2 is nonlinear due to the presence of lone pair of electrons on the central atom.....
Suppose Galileo dropped a lead ball(100 kilograms)and a glass ball(1kilogram)from the leaning tower of Pisa.Which one hit the ground first?
Answer:
If there is no air resistance then both of the objects hit the ground first.
Explanation:
which property of steel is useful for making the car body circle the correct answer
ductile magnetic
sonorous strong
A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over the next few minutes? A.) Molecules in both the metal and the surrounding air will start moving at lower speeds. B.) Molecules in both the metal and the surrounding air will start moving at higher speeds. C.) The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up. D.) The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
Answer:
the air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
Using spdf notation, what is the electron configuration for a neutral atom of beryllium
Answer:
Beryllium
Explanation:
Using van der Waals equation determine the pressure exerted by 3.00 mol of Ar gas with a volume of 50.0 L at 25.0 °C.
Answer:
1.47 atm
Explanation:
From the question.
Applying
PV = nRT................. Equation 1
Where P = pressure, V = volume, T = temperature, n = number of moles, R = Molar gas constant
Makr P the subject of the equation
P = nRT/V................ Euqation 2
Given: V = 50.0 L, n = 3.00 mol, T = 25°C = (273+25) = 298K,
Constant: R = 0.082 atm.L.K⁻¹mol⁻¹
Substitute these values into equation 2
P = (3×298×0.082)/(50)
P = 73.308/50
P = 1.46616
P ≈ 1.47 atm
How many moles of H are present in 2.50 moles of benadryl?
Answer:
Explanation:
The chemical formula of Benadryl is [tex]C_{17}H_{21}NO[/tex]
1 mol of Benadryl has 17 mol of hydrogen
2.5 mol of Benadryl has 17*2.5 = 42.5 moles of hydrogen.
Mols are peculiar chemical definitions. You have to be careful what you are talking about. You are given mols of Benadryl, which is the whole molecule. Whole molecule means the Carbon Hydrogen Nitrogen and Oxygen
Each mol of Benadryl contains 17 mols of carbon, 21 moles of hydrogen, 1 mol of nitrogen and 1 mol of oxygen
PLEASE HELP !! ILL GIVE BRAINLIEST !! 100 POINTS
IF YOUR GOOD AT CHEMISTRY OR BIOLOGY.
Answer:
C. 2H₂ + O₂ ⇒ 2H₂O
Further explanation
Conservation of mass states that in a closed system, the masses before and after the reaction are the same. So it can be concluded
mass of the reactants = mass of the products
mass cannot be created or destroyed
The number of atoms involved in a reaction remains the same⇒ number of moles also the same
chemical equation in balanced form
So let's see which of the several options , which one has the same number of atoms on both sides of the equation
2H₂ + O₂ ⇒ 2H₂O
H ⇒ left 4, right 4
O ⇒ left 2, right 2
so the equation is in balance and represents the Law of Conservation of Mass
Explanation:
Hope I helped! :)
what's the solubility alcohols in water
Answer:
Methanol, Ethanol,Propanol,Butanol, Pentanol, Hexanol, Heptanol.
How many grams of aluminum are needed to completely react with
192 g of oxygen gas?
Answer:
4.28g
Explanation:
Which of the following is most likely to dissolve in NH3? A) CO2 B) CH4 C) H2S D) BH3
Answer:
C) H2S
Explanation:
In chemistry, the dissolution of one substance in another is dependent on the magnitude of intermolecular interaction between the two substances. Hence, if two substances do not interact in one way or the other, then one can not dissolve the other.
Let us consider the fact that NH3 is a polar molecule and it is a general principle that like dissolves like. Hence, only H2S which is also a polar molecule can effectively interact with NH3 due to dipole-dipole interaction between the two molecules.
Also, ammonia reacts with hydrogen sulphide as follows;
2NH3 + H2S → (NH4)2S
Hence H2S is more likely to dissolve in NH3.
Calculate the molar mass of H2SO4 + 2 NaOH = Na2SO4 + 2 H2O. Please show all work. THANK YOU!
H_2SO_4
[tex]\\ \sf\longmapsto 2(4u)+32u+4(16u)[/tex]
[tex]\\ \sf\longmapsto 8u+32u+64u[/tex]
[tex]\\ \sf\longmapsto 104u[/tex]
[tex]\\ \sf\longmapsto 104g/mol[/tex]
NaOH[tex]\\ \sf\longmapsto 23u+16u+1u[/tex]
[tex]\\ \sf\longmapsto 40u[/tex]
[tex]\\ \sf\longmapsto 40g/mol[/tex]
Na2SO4[tex]\\ \sf\longmapsto 2(23u)+32u+4(16u)[/tex]
[tex]\\ \sf\longmapsto 46u+23u+64u[/tex]
[tex]\\ \sf\longmapsto 69u+64u[/tex]
[tex]\\ \sf\longmapsto 133u[/tex]
[tex]\\ \sf\longmapsto 133g/mol[/tex]
H_2O
[tex]\\ \sf\longmapsto 2(1u)+16u[/tex]
[tex]\\ \sf\longmapsto 18u[/tex]
[tex]\\ \sf\longmapsto 18g/mol[/tex]
What is the pH of sulfuric acid?
Explanation:
0.3,1.2, or 2.1. sorry if it's wrong.
Question 19 (2 points)
✓ Saved
How many milliliters of a 0.200 M NaOH solution are needed to react with 28.0 mL
of a 0.500 M NiCl2 solution?
NiCl2 (aq) + 2NaOH (aq)
Ni(OH)2 (s) + 2NaCl (aq)
Your Answer:
Answer:
Explanation: NiCl2 (aq) + 2NaOH (aq)
Ni(OH)2 (s) + 2NaCl (aq)
M(NiCl2)= 0.500 M
M(NaOH)=0.200 M
V(NiCl2)= 28.0 mL
According to balanced reaction:
2*number of mol of NiCl2 =1*number of mol of NaOH
2*M(NiCl2)*V(NiCl2) =1*M(NaOH)*V(NaOH)
2* 0.50 M * 28.0 mL = 1* 0.2 M* V(NaOH)
V (NaOH) = 140 mL
Answer : 140 mL
The bond between which two atoms is most
polar?
(1) C-0
(3) H-O
(2) F-F
(4) N-H
TOITTI
The bond between hydrogen (H) and oxygen (O) (option 3: H-O) has the highest electronegativity difference (1.24). Therefore, the H-O bond is the most polar among the given choices.
The polarity of a chemical bond depends on the electronegativity difference between the two atoms involved. The greater the electronegativity difference, the more polar the bond.
Let's compare the given bond options:
(1) C-O: The electronegativity of carbon (C) is approximately 2.55, and the electronegativity of oxygen (O) is approximately 3.44. The electronegativity difference is 0.89.
(3) H-O: The electronegativity of hydrogen (H) is approximately 2.20, and the electronegativity of oxygen (O) is approximately 3.44. The electronegativity difference is 1.24.
(2) F-F: Fluorine (F) is the most electronegative element with an electronegativity of 3.98. Since both atoms in this case are fluorine, the electronegativity difference is 0.
(4) N-H: The electronegativity of nitrogen (N) is approximately 3.04, and the electronegativity of hydrogen (H) is approximately 2.20. The electronegativity difference is 0.84.
From the options provided, the bond between hydrogen (H) and oxygen (O) (option 3: H-O) has the highest electronegativity difference (1.24). Therefore, the H-O bond is the most polar among the given choices.
Learn more about polar bond from the link given below.
https://brainly.com/question/33647611
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