Why is salt put on icy roads and sidewalks in the winter?
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Related Questions
25) Which of these pH numbers indicates the highest level of acidity?A) 5B) 8C) 10D) 1226) Which pH indicates a basic solution?A) 1B) 5C) 7D) 1227) Given the following solutions:Solution A: pH of 10Solution B: pH of 7Solution C: pH of 5Which list has the solutions placed in order of increasing H+ concentration?A) A, B, CB) B, A, CC) C, A, BD) C, B, A28) Which of the following pH values indicates the highest concentration of hydronium ions in a solution?A) pH = 1B) pH = 2C) pH = 3D) pH = 429) As HCl(g) is added to water, the pH of the water solutionA) decreasesB) increasesC) remains the same30) What is the pH of a 0.0001 M aqueous solution of HCl?A) 1B) 2C) 3D) 431) What is the pH of a 0.001 M HNO3 solution?A) 1B) 2C) 3D) 1132) The [H3O+] of a solution is 1 × 10–8. This solution has a pH ofA) 6, which is acidicB) 8, which is basicC) 6, which is basicD) 8, which is acidic33) The H3O+ ion concentration of a solution is 1 × 10–4 mole per liter. This solution isA) acidic and has a pH of 4B) acidic and has a pH of 10C) basic and has a pH of 4D) basic and has a pH of 1034) The pH of 0.001M HCl isA) 1B) 2C) 3D) 435) Phenolphthalein is pink in an aqueous solution having a pH ofA) 5B) 2C) 7D) 1236) What is the color of the indicator thymol blue in a solution that has a pH of 11?A) redB) blueC) pinkD) yellow37) Three samples of the same solution are tested, each with a different indicator. All three indicators, bromthymol blue, bromcresol green and thymol blue, appear blue if the pH of the solution isA) 4.7B) 6.0C) 7.8D) 9.938) Based on the results of testing colorless solutions with indicators, which solution is most acidic?A) a solution in which bromthymol blue is blueB) a solution in which bromcresol green is blueC) a solution in which phenolphthalein is pinkD) a solution in which methyl orange is red39) Which indicator would best distinguish between a solution with a pH of 3.5 and a solution with a pH of 5.5A) bromthymol blueB) bromcresol greenC) litmusD) thymol blue40) Which indicator is blue in a solution that has a pH of 5.6?A) bromcresol greenB) bromthymol blueC) methyl orangeD) thymol blue41) Which indicator, when added to a solution, changes color from yellow to blue as the pH of the solution is changed from 5.5 to 8.0?A) bromcresol greenB) bromthymol blueC) litmusD) methyl orange42) The table below shows the color of the indicators methyl orange and litmus in two samples of the same solution.Which pH value is consistent with the indicator results?A) 1B) 5C) 3D) 1043) In which 0.01 M solution is phenolphthalein pink?A) CH3OH(aq)B) Ca(OH)2(aq)C) CH3COOH(aq)D) HNO3(aq)44) Which indicator is yellow in a solution with a pH of 9.8?A) methyl orangeB) bromthymol blueC) bromcresol greenD) thymol blue45) In which solution will thymol blue indicator appear blue?A) 0.1 M CH3COOHB) 0.1 M KOHC) 0.1 M HClD) 0.1 M H2SO446) According to Reference Table M, what is the color of the indicator methyl orange in a solution that has a pH of 2?A) blueB) yellowC) orangeD) red47) Which solution when mixed with a drop of bromthymol blue will cause the indicator to change from blue to yellow?A) 0.1 M HClB) 0.1 M NH3C) 0.1 M CH3OHD) 0.1 M NaOH48) According to one acid-base theory, NH3 acts as a base when an NH3 moleculeA) accepts an ionB) donates an ionC) accepts an ionD) donates an ion49) Given the diagram representing a reaction:According to one acid-base theory, the water acts asA) a base because it accepts an H+B) a base because it donates an H+C) an acid because it accepts an H+D) an acid because it donates an H+50) Given the balanced equation representing a reaction:According to one acid-base theory, the H2O() molecules act asA) a base because they accept H+ ionsB) a base because they donate H+ ionsC) an acid because they accept H+ ionsD) an acid because they donate H+ ions
What is cement used for
What does the nucleus of one atom want to do to the electrons of a nearby atom?
Why is helium used in airships rather thaan the other nobles gases
a. I
b. F
c. Ir
d. Fe
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(3) (the potential energy of the products) – (the potential energy of the reactants)
(4) (the potential energy of the reactants) – (the potential energy of the products)
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Reason:
Heat of reaction for a chemical reaction is the change in the enthalpy of a chemical reaction that occurs at a constant pressure. This can be measured on the basis of potential energy of reactants and products. Mathematically, it is expressed as:
Heat of reaction = ΔH = ΣH products - ΣHr reactants.
1s2 2s2 2p3
1s2 2s2 2p4
1s2 2s2 2p6
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Answer:
1s², 2s², 2p⁴
Explanation:
Electronic configuration is the distribution of electrons of an atom in atomic orbitals. As we know Oxygen is a non metal and is present in group 6 and period 2 with atomic number 8. The atomic number in fact specifies the number of protons. Hence, for a neutral oxygen atom there must be 8 electrons to balance the charges of protons.
These 8 electrons are distributed in two main energy levels i.e. n = 1 and 2 and sub energy levels i.e. s and p. According to certain rules like Aufbau Principle, Pauli's Exclusion Principle and Hund's Rule the electronic configuration for eight electrons is as,
1s², 2s², 2px², 2p¹, 2p¹
Final answer:
The electronic configuration for oxygen is 1s2 2s2 2p4.
Explanation:
The electron configuration for oxygen is 1s2 2s2 2p4.
In the electron configuration, the numbers represent the energy levels (1s, 2s, 2p), and the superscripts represent the number of electrons in each orbital. The electron configuration follows the Aufbau principle, which states that electrons fill the lowest energy levels first.
In the case of oxygen, there are 8 electrons in total. The first two electrons fill the 1s orbital, the next two fill the 2s orbital, and the remaining four fill the 2p orbital (with two electrons each in the three 2p orbitals).
Learn more about Electronic Configuration here:
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Select one:
a. 354 kJ of energy will be given off by the reaction
b. 354 kJ of energy will be absorbed by the reaction
c. 708 kJ of energy will be given off by the reaction
d. 708 kJ of energy will be absorbed by the reaction
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but the limiting factor is the Oxygen
according to stranded equation,
CH4 + 2 O2 --> CO2 + 2 H2O ΔH = -889 kJ/mol
just by taking proportions
(-889 kJ/mol) / 2 x 0.8 mol = - 355.6 kJ
so i think the answer is (a)
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Answer:
Explanation:
A physical property is a property that can be observed without changing the composition.
Some examples of physical properties are:
- Color
- Density
- Length
- Mass
- Smell
- Temperature
- Boiling Point
- Hardness
Now, let's examine our answer choices.
Choice A: Sugar is white in color
- The property is color, which is a physical property.
Choice B: Iron is more dense than aluminum
- The property is density, which is a physical property.
Choice C: Diamond is harder than graphite.
- The property is hardness, which is a physical property.
Since all three choices depict physical properties, the best choice is D. All of the above.
Answer:
D
Explanation:
All explain physical no chemical examples were given