25) Which of these pH numbers indicates the highest level of acidity?A) 5
B) 8
C) 10
D) 12
26) Which pH indicates a basic solution?

A) 1
B) 5
C) 7
D) 12
27)
Given the following solutions:
Solution A: pH of 10
Solution B: pH of 7
Solution C: pH of 5
Which list has the solutions placed in order of increasing H+ concentration?

A)
A, B, C
B)
B, A, C
C)
C, A, B
D)
C, B, A
28) Which of the following pH values indicates the highest concentration of hydronium ions in a solution?

A) pH = 1
B) pH = 2
C) pH = 3
D) pH = 4
29) As HCl(g) is added to water, the pH of the water solution

A) decreases
B) increases
C) remains the same
30) What is the pH of a 0.0001 M aqueous solution of HCl?

A) 1
B) 2
C) 3
D) 4
31) What is the pH of a 0.001 M HNO3 solution?

A) 1
B) 2
C) 3
D) 11
32) The [H3O+] of a solution is 1 × 10–8. This solution has a pH of

A) 6, which is acidic
B) 8, which is basic
C) 6, which is basic
D) 8, which is acidic
33) The H3O+ ion concentration of a solution is 1 × 10–4 mole per liter. This solution is

A) acidic and has a pH of 4
B) acidic and has a pH of 10
C) basic and has a pH of 4
D) basic and has a pH of 10
34) The pH of 0.001M HCl is

A) 1
B) 2
C) 3
D) 4
35)
Phenolphthalein is pink in an aqueous solution having a pH of

A)
5
B)
2
C)
7
D)
12
36)
What is the color of the indicator thymol blue in a solution that has a pH of 11?

A)
red
B)
blue
C)
pink
D)
yellow
37) 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 is

A) 4.7
B) 6.0
C) 7.8
D) 9.9
38) Based on the results of testing colorless solutions with indicators, which solution is most acidic?

A) a solution in which bromthymol blue is blue
B) a solution in which bromcresol green is blue
C) a solution in which phenolphthalein is pink
D) a solution in which methyl orange is red
39)
Which indicator would best distinguish between a solution with a pH of 3.5 and a solution with a pH of 5.5

A)
bromthymol blue
B)
bromcresol green
C)
litmus
D)
thymol blue
40) Which indicator is blue in a solution that has a pH of 5.6?

A) bromcresol green
B) bromthymol blue
C) methyl orange
D) thymol blue
41) 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 green
B) bromthymol blue
C) litmus
D) methyl orange
42)
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)
1
B)
5
C)
3
D)
10
43) 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 orange
B) bromthymol blue
C) bromcresol green
D) thymol blue
45) In which solution will thymol blue indicator appear blue?

A) 0.1 M CH3COOH
B) 0.1 M KOH
C) 0.1 M HCl
D) 0.1 M H2SO4
46) According to Reference Table M, what is the color of the indicator methyl orange in a solution that has a pH of 2?

A) blue
B) yellow
C) orange
D) red
47) Which solution when mixed with a drop of bromthymol blue will cause the indicator to change from blue to yellow?

A) 0.1 M HCl
B) 0.1 M NH3
C) 0.1 M CH3OH
D) 0.1 M NaOH
48)
According to one acid-base theory, NH3 acts as a base when an NH3 molecule

A)
accepts an ion
B)
donates an ion
C)
accepts an ion
D)
donates an ion
49)
Given the diagram representing a reaction:

According to one acid-base theory, the water acts as

A)
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 as

A)
a base because they accept H+ ions
B)
a base because they donate H+ ions
C)
an acid because they accept H+ ions
D)
an acid because they donate H+ ions

The question is incomplete, this is the complete question;

In the process of attempting to characterize a substance, a chemist makes the following observations. Which are physical properties and which are chemical properties?

(a) The substance is a silvery white, lustrous metal.

(b) The substance melts at 649 ∘C

(c) The substance boils at 1105 ∘C.

(d) The density of the substance at 20 ∘C is 1.738 g/cm³.

(e) The substance burns in air, producing an intense white light.

(f) The substance reacts with chlorine to give a brittle white solid.

(g) The substance can be pounded into thin sheets or drawn into wires.

(h) The substance is a good conductor of electricity.

Answer:

(a) Physical

(b) Physical

(c) Physical

(d) Physical

(e) Chemical

(f) Chemical

(g) Physical

(h) Physical

Explanation:

(a) The substance is a silvery white, lustrous metal - is appearance which is physical.

(b) The substance melts at 649 ∘C metling point is a physical measurement

(c) The substance boils at 1105 ∘C boiling point is a physical measurement

(d) The density of the substance at 20 ∘C is 1.738 g/cm3 how heavy a substance is,is physical.

(e) The substance burns in air, producing an intense white light. Burning is a chemical change. It is a reaction of a substance with oxygen

(f) The substance reacts with chlorine to give a brittle white solid. This is a chemical reaction as the question says.

(g) The substance can be pounded into thin sheets or drawn into wires. Ductility is a physical change, the substance remains chemically unchanged

(h) The substance is a good conductor of electricity. Any conductivity is physical, the substance remains chemically unchanged

Final answer:

The substance in question is likely a pure metal, more specifically Magnesium, because of its documented properties such as lustrous appearance, ability to be drawn into wires, and high electrical conductivity. Its properties like high melting and boiling points and its reactions suggest it could be from Group 1, but its ability to be formed into sheets and wires and its high conductivity suggest it's not an ionic compound like sodium chloride.

Explanation:

The substance described in the question seems to be an example of pure metal due to the properties like lustrous appearance, ability to be drawn into wires or pounded into sheets, and high conductivity of electricity. However, some of the properties like reaction with chlorine, production of intense white light upon burning in air, and its high melting and boiling points suggest that it could be a Group 1 element such as sodium or potassium, which are known for these characteristics. Coupled with information of its density and its ability to form brittle white solid upon reaction with chlorine, it seems to likely be Magnesium, a silvery-white lustrous metal.

Furthermore, ionic compounds like sodium chloride have high melting and boiling points, conduct electricity when molten, and ions are freed to move allowing conductivity. However, such compounds, unlike pure metals, cannot be drawn into wires or pounded into sheets and are usually brittle solids, which would make it less likely that the substance in question is an ionic compound.

The most confident identification will be based on the substance's observed physical and chemical properties and their comparison to known properties of pure metals and ionic compounds.

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The elements react with other element and form compounds in order to complete their octet (possess 8 electrons in their valence shell) and attain stability. The formation of compounds by the elements can take place by either sharing of electrons or transfer of electrons from one atom to other atom. The elements whose octet is complete that means those elements which has eight electrons in their valence shell are nonreactive as they are already stable due to completion of octet.

In periodic table, the elements of group 18 (Noble gas) have their octet completely filled and are stable in the elemental form. Thus, the elements of group 18 (helium, neon, argon, krypton, xenon, radon, and oganesson) are nonreactive.

Final answer:

The noble gases in Group 18 are nonreactive due to their filled valence shells, but exceptions to this rule have been discovered

Explanation:

The elements in Group 18, also known as the noble gases (helium, neon, argon, krypton, xenon, and radon), are nonreactive. They have filled valence shells, which makes them stable and unreactive. However, it's important to note that this assumption was proven false by Dr. Neil Bartlett in 1962 when he discovered that some noble gases can react under certain conditions.

Thus, these specific gases are a group of chemical elements found in Group 18 of the periodic table and are typically characterized by their overall stability and lack of reactivity, making them useful in applications like lighting, lasers, and cryogenics.

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An intensive property of matter is independent of the amount of substance present and is inherent to the material itself. Thus, the correct statement is 'It is the same for every sample of a single substance.' Examples of intensive properties include temperature, density, and color.

An intensive property of matter is a characteristic that does not change based on the amount of a substance. It is independent of the quantity of the substance present and is inherent to the material itself. Therefore, the statement which best describes an intensive property of matter would be 'It is the same for every sample of a single substance.'

Examples of intensive properties include temperature, density, and color. For instance, if you divide a gold bar in half, each half will have the same density and color as the original bar, because these properties are independent of the amount of substance present.

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