Which of the following is NOT soluble in water? A) NaCl
B) KBr
C) CH3CH2OH
D) HCl
E) C6H6

How is this determined?

Answers

Answer 1

Answer: The correct answer is E. C6H6 is not soluble in water. This is determined by the polarities of these substances. Benzene is a non-polar substance because it has equal number of electrons sharing a bond thus it does not dissolve in water which is a polar substance.

Answer 2

Answer: all hydroxides are insoluble with the exception of those formed with alkali metal ions and barium.
Hence, CH3CH2OH is insoluble

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A form of electricity which can attract things

Answers

A form of electricity which can attract things is static electricity. Static electricity is the result of an imbalance between negative and positive charges in an object. These charges built up o the surface of an object until they find a way to e released or discharged causing the attraction of things.

________ are molecules whose general structure includes a central carbon with a carboxyl group, an amine group, a hydrogen molecule, and a residual (r) group.

Answers

The amino acids are the molecules where we can found the carboxyl group (- $COO^(-)$ ), amino group (- $NH_(2)$ ), hydrogen atom (H) and a residual R-group. On the structure of the residual R-group the name of the amino acid depends. Like if R is hydrogen (H) the amino acid is alanine; If R- group is a phenyl group i.e. $-C_(6)H_(5)$ , the compound is called phenyl alanine. The structure of the general amino acid skeleton can be shown as-

Which of the following chemical agents is used for sterilization? a. chlorine b. ethylene oxide c. soap d. phenolics e. alcohol

Answers

Answer:

Ethyleneoxideisthechemicalagentsusedforsterilization.

Final answer:

Ethylene oxide is the chemical agent used for sterilization amongst those listed in the question. This gas sterilizes by disrupting the DNA of microorganisms. Other agents listed, such as chlorine, alcohol and phenolics are generally considered disinfectants, not sterilants.

Explanation:

Out of the chemical agents listed, ethylene oxide is the one commonly used for sterilization. Ethylene oxide is a gas that sterilizes by penetrating and disrupting the DNA of microorganisms, preventing them from reproducing. It is frequently used to sterilize medical and laboratory equipment, particularly items that cannot be sterilized by high heat such as plastic, electrical equipment, and delicate instruments.

While chlorine, alcohol, and phenolics can kill many microorganisms, they are generally considered disinfectants rather than sterilants because they may not kill all types of bacteria, viruses, fungi, and spores. Soap is typically used for cleaning, not specifically for its antimicrobial properties.

Learn more about Chemical Sterilization here:

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How many grams of hydrogen peroxide (H2O2) must be added to 1,500 mL of water to produce a concentration of 1.33 m (molal solution)? (Recall that the density of water is 1.0 gram/mL.)

Answers

Given:

1,500 mL of water

1.33 m (molal solution

Required:

grams of hydrogen peroxide (H2O2

solution:

1.33 molal = 1.33 m = 1.33 moles H2O2/kg water

1 gram/liter of water (1 liter/1000 mL) (1500mL)(1 kg/1000g) = 0.0015 kg water

1.33 moles H2O2/kg water (0.0015 kg water) = 0.001995 moles H2O2

Molar mass of H2O2 = 34 g/mol

0.001995 moles H2O2 (34 g/mol) = 0.068 grams H2O2

classify these compounds by whether they behave as strong acids, weak acids, strong bases, or weak bases in aqueous solution.

Answers

For number one, the reaction is the neutralization of a strong acid and a strong base to yield a salt and water. The strong acid is the HCl and the strong base is NaOH. The salt is NaCl.

For number two, the equation is balanced. Na in the reactant side has one atom and also in the product side. O has only one atom in the product and in the reactant. There are 2H’s in the reactant and in the product side (present in H2O, the 2 in H stands for 2 atoms of H). One atom of Cl is present in the reactant and product side.

For number three, the reactants are NaOH-sodium hydroxide and HCl-hydrogen chloride(hydrochloric acid). The products are NaCl-sodium chloride and H2O-water.

The diagram shows a ball resting at the top of a hill. Which statement best describes the energy in this system

Answers

Answer:

Option A is correct.

A.The potential energy in the system is greatest at X.

Explanation:

A ball resting at the top of a hill will have greatest potential energy because when an object is at rest it tend to have greatest potential energy. When It moves from position X to Y the potential energy of the ball will decrease and its kinetic energy will increase.

Answer choices are listed below.

A.The potential energy in the system is greatest at X.

B.The kinetic energy in the system is greatest at X.
C.Total energy in the system decreases as the ball moves from X to Y.
D.Total energy in the system increases as the ball moves from X to Y.

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