CH 105 INTRODUCTION TO CHEMISTRY; NURSING -

CH 105 INTRODUCTION TO CHEMISTRY; NURSING -

QUESTIONS & CORRECT ANSWERS ALREADY GRADED A+|

REGIS CH 105 LATEST FINAL EXAM (NEW!!)

In 1-3 sentences, define an isotope - ANSWER-Atoms of the same element that have the same number of protons in their nuclei, but different number of neutrons

Naturally occurring Mg has three stable isotopes, 24^Mg, 25^Mg, and 26^Mg.This means that there are three forms of Mg atoms, each with a unique atomic weight. This appears to be contrary to the idea that atomic weight is the defining property of an element. - ANSWER-The neutrons do not determine an element.The protons do. Since these are merely isotopes, they are the same element.

Identify the nonmetals that are common in organic compounds. Select the correct

answer below:

• hydrogen
• carbon
• oxygen
• all of the above - ANSWER-D. all of the above

What is the chemical formula? - ANSWER- C6H12O2

The melting point of two compounds are as follows: Benzaldehyde's melting point

is −26∘C and barium chloride's is 962∘C. Identify which are likely to be organic and inorganic compounds from these values.

Select the correct answer below: 1 / 3

• Benzaldehyde is more likely to be an organic compound because it has a low

melting point. Barium chloride is likely to be inorganic because it has a high melting point.

• Benzaldehyde is more likely to be an inorganic compound because it has a low

melting point. Barium chloride is likely to be organic because it has a high melting point.

• Both have very high melting points, so they are both likely to be organic.
• Both have very high melting points, so they are both likely to be inorganic. -

ANSWER-a. Benzaldehyde is more likely to be an organic compound because it has a low melting point. Barium chloride is likely to be inorganic because it has a high melting point. Explanation: The melting point of benzaldehyde is low, and it is an organic compound. The boiling point of barium chloride is high, and is made of a metal and a nonmetal so it is an inorganic compound.

Identify the correct statements regarding the melting points of iron (II) sulfide

(FeS) and methanol (CH3OH). Select the correct answer below:

• The melting point of iron (II) sulfide is low and the melting point of methanol is

high.

• The melting point of iron (II) sulfide is high and the melting point of methanol is

low.

• Both have the same melting points. - ANSWER-b. The melting point of iron (II)

sulfide is high and the melting point of methanol is low. Explanation: Iron (II) sulfide is an inorganic compound since it contains a metal and a nonmetal.Methanol is an organic compound since it contains carbon, hydrogen, and oxygen.The melting point of inorganic compounds are generally higher than that of organic compounds because of strong ionic bonding.

Identify the correct statement regarding the properties of inorganic compounds.

Select the correct answer below:

• Inorganic compounds are typically polar or ionic.
• Inorganic compounds are often soluble in water.
• Inorganic compounds are rarely soluble in water.

d. both A and B - ANSWER-d. both A and B. Explanation: norganic compounds

are typically polar or ionic and since water is a polar compound inorganic molecules tend to be soluble in water. Where as organic compounds tend to be nonpolar so they are insoluble in water unless they are polar.

Which of the following is an example of unsaturated hydrocarbon?

Select the correct answer below:

• methane 2 / 3

• ethane
• propane

D. ethene - ANSWER-D. ethene. Explanation: Saturated hydrocarbons are those

with the maximum number of hydrogens for the carbon backbone, and unsaturated hydrocarbons have fewer hydrogens due to the presence of double and triple bonds. Ethene (C2H4) is an alkene, meaning it has a double bond, so it is unsaturated. The remaining choices are all alkanes and therefore saturated.

An acyclic (not a ring) hydrocarbon with the molecular formula CnH2n must be

which type of hydrocarbon? Select the correct answer below:

• alkane
• alkene
• alkyne

D. aromatic hydrocarbon - ANSWER-B. alkene. Explanation: The chemical

formula of the form CnH2nis two fewer hydrogens than a saturated acyclic hydrocarbon, so it means there is a single double bond. This can only be the molecular formula of an alkene.

Which of the following is an example of a saturated hydrocarbon?

Select the correct answer below:

• octane
• ethene
• benzene

D. propyne - ANSWER-A. octane. Explanation: Octane is an alkane. Alkanes are

hydrocarbons that contain only single bonds so they have the maximum number of hydrogen atoms bonded to carbon atoms and therefore are unsaturated.

A fully saturated hydrocarbon is called an ______. Select the correct answer

below:

• alkane
• alkene
• alkyne

D. none of the above - ANSWER-A. alkane. Explanation: An alkane has only

single covalent bonds between the carbon atoms, and contains the maximum number of hydrogens allowed for a hydrocarbon of that particular number of carbons. Therefore, alkanes are considered to be fully saturated.

Which of the following is a characteristic of alkanes? Select the correct answer

below:

• Noncyclic alkanes have the molecular formula CnHn+1.
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