As the density of a substance increases, the volume of a given mass of that substance__.a. Increases
b. is not affected
c. decreases
d. fluctuates

Answers

Answer 1

Answer:

Answer : The correct option is, (C) decreases

Explanation :

As we know that the density is measured as the mass of substance divided by the volume of substance. The S.I unit of density is, kilogram per cubic meter or $Kg/m^3$

Formula for density :

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

That means the density is directly proportional to the mass of the substance and inversely proportional to the volume of the substance.

As the volume of substance decreases, the density of a substance will be increases and volume of substance increases, the density of a substance will be decreases.

Hence, the correct option is, (C) decreases

Answer 2

Answer: As the density of a substance increases the volume of a givenmass of the substance decreases

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List down the types of intermolecular forces that exist between molecules (or basic units) in the species given below: (a) benzene (C6H6), (b) CH3Cl, (c) PF3, (d) NaCl, (e) CS2

Answers

(a) benzene (C6H6) - nonpolar molecules . Only dispersion forces are present.

(b) CH3Cl - Chloroform ; polar molecules. Both dispersion and dipole-dipole forces are present.

(c) PF3 - Phosphorus triflouride ; has polar bonds but has nonpolar molecule due to its symmetrical structure. Only dispersion forces are present.

(d) NaCl - Sodium chloride ; ionic compound. Both ion-ion and dispersion forces are present.

(e) CS2 - Carbon disulfide ; nonpolar molecules. Only dispersion forces are present.

Mark's uncle is about to have a procedure to treat his prostate cancer. The treatment involves placement of smallpellets close to the tumor to deliver a localized dose of radiation. What type of nuclear therapy is this?

a. external beam radiation
b. brachytherapy
c. radiopharmaceuticals
d. internal X-rays

Answers

Answer: b. Brachytherapy

Explanation:

What is the percent composition by mass of hydrogen in NH4HCO3 (gram-formula mass = 79 grams/mole)?

Answers

Answer:The percent composition by mass of hydrogen in $NH_4HCO_3$ is 6.32 %.

Explanation:

Molecular mass of the $NH_4HCO_3$ = 79 g/mol

Mass of the hydrogen atom present in one formula unit of $NH_4HCO_3$ :

$= 5* \text{(atomic mass of hydrogen)}=5* 1 g/mol= 5 g/mol}$

$\text{percentage of hydrogen}=\frac{\text{mass of the hydrogen in}NH_4HCO_3}{\text{molar mass of}NH_4HCO_3}* 100$

$\text{percentage of hydrogen}=(5g/mol)/(79 g/mol)* 100=6.32\%$

The percent composition by mass of hydrogen in $NH_4HCO_3$ is 6.32 %.

Answers: 6.3%

Explanation:

Choose the letter of the choice that best completes the statement or answers the question. Elements in the same group have the same __________. A. atomic radius
B. energy level of outer electrons
C. nuclear charge
D. number of valence electrons

Answers

I think the correct answer from the choices listed above is option D. Elements in the same group have the same number of valence electrons. They have the same number of electrons in the outer orbital. They are the electrons that are involved with chemical bonding with other elements.

Elements in the same group have D. Same number of valence electrons.

A substance with a ph of 6 is called

Answers

An acid has a pH of 1-6, while 7 is neutral, commonly used for water.

A substance with a pH of 6 is an acid that is not strong because its close to 7.

Final answer:

A substance with a pH of 6 is considered slightly acidic. The pH scale, which measures the concentration of hydrogen ions, ranges from 0 to 14 where a pH of 7 is neutral. A substance with a pH below 7 is acidic, while a substance with a pH above 7 is considered basic or alkaline.

Explanation:

A substance with a pH of 6 is often considered slightly acidic. The pH scale measures the concentration of hydrogen ions (H+) in a substance and ranges from 0 to 14 where a pH of 7 is considered neutral. Anything below 7 indicates an acidic solution, and anything above 7 is considered basic or alkaline. So, a substance with a pH of 6 is closer to the neutral point, but is still acidic as it falls below 7. Since one unit on the pH scale represents a decrease in hydrogen ion concentration by a factor of 10, a solution with a pH of 6 is 10 times less acidic than one with a pH of 5, but 10 times more acidic than a neutral solution at pH 7.

Learn more about pH scale here:

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I need help! In an equilibrium reaction with a Keq of 1 × 108 A. products are favored. B. the reaction is nonspontaneous. C. the reaction is endothermic. D. reactants are favored.