Answer:
Vapor pressure is defined as the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system.
Explanation:
The student then sets up two more test tubes containing iron nails.
Explain why
test tube 1 does not rust because boiled water has no oxygen and oil stops new oxygen from entering and without oxygen iron cannot rust.
test tube 2 does not rust because the drying agent absorbs all the moisture from air, and moisture is required for iron to rust.
In the absence of oxygen or moisture rusting of the nail can not take place.
There are two very important things that must be present for the process of rusting to take place these are;
Oxygen MoistureIf we can exclude these two, rusting will not take place in the absence of either of them.
Rusting does not occur in tube 1 because the water have been boiled and the oxygen removed then it is stored under oil that prevents corrosion.
In tube 2, there is a drying agent that removes moisture from air hence moisture does not have access to the nail so it does not rust.
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Please solve I will give brainliest to correct answer
Answer:
-846 kJ
Explanation:
Using Henderson Hasselbach's law,
2Al + 3/2 O2 -> Al2O3 H = -1670 kJ
-(2Fe + 3/2 O2 -> Fe2O3) = Fe2O3 -> 2Fe + 3/2 O2 H = 824 kJ
-1670 kJ + 824kJ = -846 kJ
How many grams of chlorine gas are needed to make 5.20 x 100 g of a solution that is 2.00 ppm chlorine by mass?
mass:
CI,
Answer:
mass of chlorine = 10.4 grams
Explanation:
Mass of the solution = 5.20 × 10⁶ g
ppm chlorine by mass = 2.00
Recall that:
[tex]ppm = \dfrac{mass \ of \ chorine \ gas (solute)}{ mass of the solution }\times 10^6[/tex]
[tex]2 = \dfrac{mass \ of \ chorine \ gas (solute)}{ 5.20\times 10^6}\times 10^6[/tex]
mass of chlorine = 5.20 × 2.0
mass of chlorine = 10.4 grams
Select the element(s) that will have ONE unpaired electron in the p orbital.
Ca
N
B
Ar
Br
Answer: The element B will have ONE unpaired electron in the p orbital.
Explanation:
The electronic configuration of each given element is as follows.
Atomic number of calcium (Ca) is 20.
Ca: [tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2}[/tex]
Atomic number of nitrogen (N) is 7.
N: [tex]1s^{2} 2s^{2} 2p^{3}[/tex]
Atomic number of boron (B) is 5.
B: [tex]1s^{2} 2s^{2} 2p^{1}[/tex]
Atomic number of argon (Ar) is 18.
Ar: [tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6}[/tex]
Atomic number of bromine (Br) is 35.
Br: [tex][Ar] 4s^{2} 3d^{10} 4p^{5}[/tex]
Therefore, boron is the only element that have one unpaired electron in the p-orbital.
Thus, we can conclude that element B will have ONE unpaired electron in the p orbital.
A neutral atom with the electron configuration 2-7 would most likely form a bond with an atom having the configuration
Answer:
1s2 2s2
Explanation:
does anyone know how many grams of of fe2o3 react to produce 450 grams of fe
Answer:
14.4g
Explanation:
4. Balance the following equation. Then determine the number of mols of Nitrogen formed given the values in a,b and c.
NH3 + O2 → N2 + H2O
a. 4 mol NH3
b. 4 mol N2
c. 4.5 mol O2
Answer:
4NH3 + 3O2 → 2N2 + 6H2O
a. 2 moles
b. 4 moles
c. 3 moles
Explanation:
a. 4 mol NH3
4NH3 + 3O2 → 2N2 + 6H2O
4 : 3 : 2 : 6
4 (mol)
⇒[tex]n_{N2}[/tex] = 4 × 2 ÷ 4 = 2
b. 4 mol N2
c. 4.5 mol O2
4NH3 + 3O2 → 2N2 + 6H2O
4 : 3 : 2 : 6
4.5 (mol)
⇒[tex]n_{N2}[/tex] = 4.5 × 2 ÷ 3 = 3
Pls just help me out the vid is 6 Chemical Reactions That Changed History; need help on no.6. I DON’T EVEN KNOW HOW TO SOLVE IT
Explanation:
HCL you can do it yourself .try again
What is the difference between gases and nonmetal?
Answer:
1) some of the gas maybe metal but non metal directly refers it self to not begin metal
2) gases are present in only air . non metals are available in solid form too
N2O3 → N2 + O2
Name the reactants in this reaction.
Name the products in this reaction.
[tex]\text{N}_{2}\text{O}_{3}=\text{nitrogen trioxide}\\\text{N}_{2}=\text{nitrogen}\\\text{O}_{2}=\text{oxygen}[/tex]
A solution has a pH of 10.
What is the concentration of hydrogen ions?
WOULD YOU BE ABLE TO FORM RUST WITHOUT OXYGEN? Explain.
Answer:
No
Explanation:
Rust is an iron oxide, a usually reddish-brown oxide formed by the reaction of iron and oxygen in the catalytic presence of water or air moisture.
what class is sodiumtrioxocarbonate(IV) strong or weak base and why?
Answer:
Strong base
Explanation:
Anhydrous sodiumtrioxocarbonate(IV) Na2CO3 and crystalline sodiumtrioxocarbonate(IV) Na2CO3 are two forms of sodiumtrioxocarbonate(IV) Na2CO3. The Solvay process is the most common name for the sodiumtrioxocarbonate(IV) Na2CO3 production process.
Still, as Na2CO3 reacts, it produces CO3. That tends to be a weak acid's conjugate base. As a result of the removal of H+, carbonic acid was formed (Strong Base)
whats the chemical equation for gypsum (made from Cacl2·2H20 and H2SO4)
In the graphic,
X represents which element?
40
20
Answer:Ca
Explanation:
How many moles of CH2 must react in order to produce 50 moles
This element has an oxidation number of -3 and it has 16 neutrons. What element is this room made of
Answer: Element is P, phosphor
Explanation: Phosphor has oxidation number -III and it has 15 protons. So it is possible to have 16 neutrons. Other elements having oxidation number -III are N and As which can not have an isotope with 16 neutrons.
The subatomic particle which has the ability to transfer from one object to another, creating an
electric current, is ...
O neutron
O proton
O electron
O quark
Consider the incorrectly balanced combustion equation:
2C6H6 + 602 => 12CO2 + 6H2O
Select ALL elements that are not balanced.
Carbon
Hydrogen
Oxygen
In each of the molecules drawn below one chemical bond is colored red. Decide whether this bond is likely to be polar or not. If the bond is likely to be polar, write down the chemical symbol for the atom which will have more negative charge. The highlighted bond is polar and the more negative atom is The highlighted bond is nonpolar. The highlighted bond is polar and the more negative atom is The highlighted bond is nonpolar. The highlighted bond is polar and the more negative atom is The highlighted bond is nonpolar.
The question is incomplete, the complete question is shown in the image attached to this answer
Answer:
See Explanation
Explanation:
I want us to bear something in mind. A compound is polar when there is a considerable difference in electronegativity between two bonding atoms in the molecule.
The implication of this is, the shared electron pair of the bond will be closer to the atom of greater electronegativity than the atom of lesser electronegativity thereby creating a dipole in the molecule.
Let us consider each of the compounds;
For Cl-F, the highlighted bond is polar and F is the more electronegative atom
For H-Br, the highlighted bond is polar and Br is the more electronegative atom
For N≡N, the highlighted bond is nonpolar since it is a homonuclear diatomic molecule.
How much water needs to be added to 27.00 millilters of 1.500 M LiOH solution to make a 0.02000 M LiOH solution?
Answer:
3000000000000009000000
Use Hess’s Law to calculate the heat of reaction for the following reaction:
2H2O2 → 2H2O +O2 ∆H=?
2H2 +O2 → 2H2O ∆H=-572 KJ
2H2O2 → 2H2 + 2O2 ∆H=376 KJ
The heat of reaction for the reaction 2H₂O₂ → 2H₂O +O₂ is -196 KJ
Calculating heat of reaction using Hess's lawFrom the question, we are to calculate the heat of reaction for the reaction
2H₂O₂ → 2H₂O +O₂ ∆H=?
Using Hess's law
Hess's Law of constant heat summation states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes
From the given equations,
2H₂ +O₂ → 2H₂O ∆H= -572 KJ ---------- (1)
2H₂O₂ → 2H₂ + 2O₂ ∆H= 376 KJ ----------- (2)
Adding equations (1) and (2), we get
2H₂O₂ → 2H₂O +O₂ ∆H= -572 KJ + 376 KJ
2H₂O₂ → 2H₂O +O₂ ∆H= -196 KJ
Hence, the heat of reaction for the reaction 2H₂O₂ → 2H₂O +O₂ is -196 KJ.
Learn more on Calculating heat of reaction using Hess's law here: https://brainly.com/question/26491956
Why Does the Moon Appear in the Daytime? ...
How Much Does the Sky Weigh? ...
How Much Does the Earth Weigh? ...
How Do Airplanes Stay in the Air? ...
Why Is Water Wet? ...
What Makes a Rainbow? ...
Why Don't Birds Get Electrocuted When They Land on Electric Wires?
molar mass (NH4)2SO4
Answer:
132.15
Explanation:
Molar mass N = 14.00
Molar mass H = 1.01
Molar mass H4 = 1.01 x 4 = 4.04
Molar mass NH4 = 14.00 + 4.04 = 18.04
Molar mass (NH4)2 = 18.04 x 2 = 36.08
Molar mass S = 32.07
Molar mass O = 16.00
Molar mass O4 = 16.00 x 4 = 64.00
Molar mass SO4 = 32.07 + 64.00 = 96.07
Molar mass (NH4)2SO4 = 36.08 + 96.07 = 132.14
1A: Consider these compounds:
A. PbF2
B. Ni(CN)2
C. FeS
D. CaSO4
Complete the following statements by entering the letter(s) corresponding to the correct compound(s). (If more than one compound fits the description, include all the relevant compounds by writing your answer as a string of characters without punctuation, e.g, ABC.)
Without doing any calculations it is possible to determine that magnesium hydroxide is more soluble than __________, and magnesium hydroxide is less soluble than _______.
It is not possible to determine whether magnesium hydroxide is more or less soluble than_______ by simply comparing Ksp values.
1B: For each of the salts on the left, match the salts on the right that can be compared directly, using Ksp values, to estimate solubilities.
(If more than one salt on the right can be directly compared, include all the relevant salts by writing your answer as a string of characters without punctuation, e.g, ABC.)
1. nickel(II) hydroxide
A. Fe(OH)2
2. silver chloride
B. PbS
C. AlPO4
D. MnS
Write the expression for K in terms of the solubility, s, for each salt, when dissolved in water.
nickel(II) hydroxide
silver chloride
Ksp=_______
Ksp=________
Note: Multiply out any number and put it first in the Ksp expression. Combine all exponents for s.
Solution :
Compound Ksp
[tex]$PbF_2$[/tex] [tex]$3.3 \times 10^{-8}$[/tex]
[tex]$Ni(CN)_2$[/tex] [tex]$3 \times 10^{-23}$[/tex]
FeS [tex]$8 \times 10^{-19}$[/tex]
[tex]$CaSO_4$[/tex] [tex]$4.93 \times 10^{-5}$[/tex]
[tex]$Mg(OH)_2$[/tex] [tex]$5.61 \times 10^{-12}$[/tex]
Ksp of [tex]$Ni(CN)_2 << Ksp \text{ of}\ \ Mg(OH)_2$[/tex] and both compounds dissociate the same way. Hence [tex]$Mg(OH)_2$[/tex] is more soluble than [tex]$(B). \ Ni(CN)_2$[/tex]
[tex]$Mg(OH)_2$[/tex] is less soluble than [tex]$(A). \ \ PbF_2 \ ()Ksp \ PbF_2 > Ksp \ \text{ of } \ Mg(OH)_2$[/tex]
It is not possible to determine CD - [tex]$FeS \text{ or} \ CaSO_4$[/tex] is more or less soluble than [tex]$Mg(OH)_2$[/tex] as though they have a different Ksp values their molecular dissociation is also different and they may have a close solubility values.
[tex]$Ni(OH)_2$[/tex] can be directly compared with PbS, [tex]$AlPO_4, MnS$[/tex]
[tex]$\text{For } \ Ni(OH)_2$[/tex]
[tex]$AB_2(s) \rightarrow A^{2+} + 2B^{-}$[/tex]
[tex]$Ni(OH)_2(s) \rightarrow Ni^{2+} + 2OH^-$[/tex]
100
1-s s 2s
Ksp = [tex][A2+][B-]^2 = s \times (2s)^2 = 4s^3[/tex]
Hence they can be directly compared by Ksp values, smaller the Ksp, smaller the solubility.
For Silver Chloride
[tex]$AB(s) \rightarrow A^{x+}+B^{x-}$[/tex]
[tex]$AgCl(s) \rightarrow Ag^+ + Cl^-$[/tex]
1 0 0
1 - s s s
Ksp [tex]$=[A^{x+}][B^{x-}]=s \times s = s^2$[/tex]
Hence, they can be directly compared by Ksp values, smaller the Ksp, smaller the solubility.
What volume, in milliliters,
Answer:
25.4
Explanation:
PLZ mark me brainlist
What is the mass in grams of 4.63 mol of C8H18?
Answer: 114.22852 grams
HOPE THIS HELPS
Consider the substances in the reaction: Uranium-235, Krypton-93, and Barium-140. The values of “235”, “93”, and “140” all represent what characteristic of the elements?
Answer:
Relative atomic mass
Explanation:
What is the mass in grams of 2.00 10 5 atoms of naturally occurring neon
Answer:
2.00X10^5 x 20gNe/6.02x10^23=6.46x10^-18 but books answer is 797.
Explanation:
The mass is grams 2.00 x 10⁵ atoms of naturally occurring neon is 6.70 x 10⁻¹⁸g.
What is neon?Neon is a chemical element in the periodic table. Its atomic number is 10, and it is a Nobel gas. It is a colorless, monatomic, and odorless gas.
Mass is the quantity of matter in a physical body. It can be calculated by the volume and density of the element. The mass can be calculated by the number of atoms.
Given the number of atoms of Ne is 2.00 x 10⁵
The molar mass Ne = 20.18 g/mol
6.022 x 10²³ Ne atoms have a mass of 20.18 g.
The number of atoms is divided by the Avogadro number and the mass of the element.
2.00 x 10⁵ atoms Ne has mass = (2.00*10⁵) / (6.022*10²³) x 20.18 g =
6.70 x 10⁻¹⁸g.
Thus, the mass is grams 2.00 x 10⁵ atoms is 6.70 x 10⁻¹⁸g.
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How many molecules are in 4.67 mols of H2O
Answer:
2.81 × 10²⁴ moleculesExplanation:
The number of molecules can be found by using the formula
N = n × L
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
N = 4.67 × 6.02 × 10²³
We have the final answer as
2.81 × 10²⁴ moleculesHope this helps you