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CLEP Chemistry - Additional Information

At ExamEdge.com, we focus on making our clients' career dreams come true by offering world-class practice tests designed to cover the same topics and content areas tested on the actual College Level Examination Program CLEP Chemistry Certification Exam. Our comprehensive CLEP Chemistry practice tests are designed to mimic the actual exam. You will gain an understanding of the types of questions and information you will encounter when you take your College Level Examination Program CLEP Chemistry Certification Exam. Our CLEP Chemistry Practice Tests allow you to review your answers and identify areas of improvement so you will be fully prepared for the upcoming exam and walk out of the test feeling confident in your results.

Because our practice tests are web-based, there is no software to install and no need to wait for a shipment to arrive to start studying. Your CLEP Chemistry practice tests are available to you anytime from anywhere on any device, allowing you to study when it works best for you. There are 20 practice tests available, each with 75 questions and detailed explanations to help you study. Every exam is designed to cover all of the aspects of the CLEP Chemistry exam, ensuring you have the knowledge you need to be successful!


CLEP Chemistry - Additional Info Sample Questions

When a superscript number precedes an element, such as 131I, what does that number signify?





Correct Answer:
the number of protons and neutrons


when a superscript number precedes an element, such as 131 in 131i, this number represents the mass number of the isotope of that element. the mass number is the total count of protons and neutrons in the nucleus of an atom. in the case of 131i, the element symbol i stands for iodine, and the superscript 131 indicates that this particular isotope of iodine has a combined total of 131 protons and neutrons in its nucleus.

understanding the mass number is crucial because it helps in distinguishing between different isotopes of the same element. each element is defined by its atomic number, which is the number of protons in its nucleus and is unique to that element. however, the number of neutrons can vary, leading to different isotopes of the same element. these isotopes can exhibit different nuclear stability. for example, the most common isotope of iodine is iodine-127, which is stable and non-radioactive. in contrast, iodine-131 is radioactive and is known for its uses in medical diagnostics and treatments.

the mass number is particularly important in the context of radioactivity. radioactive isotopes, or radioisotopes, have an unstable combination of protons and neutrons, which causes them to decay over time, emitting radiation in the process. this property makes them useful in various applications, including medical imaging and therapy, industrial measurements, and scientific research. the differences in mass numbers help in identifying and harnessing the specific properties of each isotope for appropriate applications. for example, iodine-131 is used in the treatment of thyroid cancer due to its radioactive nature, which allows it to destroy cancerous cells.

in summary, the superscript number like 131 in 131i denotes the mass number, which is essential for identifying isotopes and understanding their properties, especially with regard to their stability and radioactivity. this information is fundamental in fields such as chemistry, physics, medicine, and environmental science, where isotopes play a crucial role.

What is the oxidation number of manganese in KMnO4?





Correct Answer:
+7


the oxidation number of manganese in kmno4, also known as potassium permanganate, can be determined by considering the charges of the other atoms in the compound and the overall charge of the compound. potassium (k) has an oxidation state of +1. oxygen (o), typically has an oxidation state of -2 in most compounds.

in kmno4, there are four oxygen atoms, each with an oxidation number of -2, leading to a total oxidation number of -8 for all oxygen atoms combined. since the overall compound is neutral (having no net charge), the sum of the oxidation numbers of all atoms in the compound must equal zero. this means the oxidation numbers of potassium and manganese have to balance the -8 from the oxygen atoms.

given that potassium contributes +1, we have: \[ (+1) + (\text{oxidation number of mn}) + (-8) = 0 \] to find the oxidation number of manganese (mn), solve the equation: \[ 1 + (\text{oxidation number of mn}) - 8 = 0 \] \[ \text{oxidation number of mn} = 7 \]

therefore, the oxidation number of manganese in kmno4 is +7. this high oxidation state of +7 is one of the reasons why kmno4 is a strong oxidizing agent in chemical reactions.