Exams & Certification

The chemical formula for strontium sulfide is SrS. A chemist measured the amount of strontium sulfide produced during an experiment. She finds that 35.6 g of strontium sulfide is produced. Calculate the number of moles of strontium sulfide produced. Be sure your answer has the correct number of significant digits. The correct answer and explanation […]

Which of the following is a nonelectrolyte? Please state why or why not for each. Thanks a) NaOHb) HNO3c) C2H6O (ethanol)d) KFe) CH3COOH (acetic acid) The correct answer and explanation is : Let’s evaluate each of the given compounds to determine whether they are electrolytes or nonelectrolytes: a) NaOH (Sodium Hydroxide) Electrolyte. Sodium hydroxide is

For ClO3+ and ClO2, draw the lewis structure and determine the following: Type of hybrid orbitals on chlorine atomNumber of hybrid orbitals used in overlap with atomic orbitalsNumber of hybrid orbitals accommodating unshared electronsElectron domain geometryMolecular geometry The correct answer and explanation is : Lewis Structures of ( \text{ClO}_3^+ ) and ( \text{ClO}_2 ) 1.

Event A occurs with probability 0.2. Event B occurs with probability 0.3. Event C occurs with probability 0.4. If A, B, and C are disjoint, then: P(A or B or C) = 0.9. P(A or B) = 0.5. P(A or C) = 0.6. All of the answer choices are correct. The correct answer and explanation

The probability of event A occurring is 0.3, while the probability that event B occurs is 0.8. The probability that event A and event B occur simultaneously is 0.2. If it is known that event A occurred, what is the probability that event B occurred also? The correct answer and explanation is : To solve

Define the term Visual Cliff Give an everyday life example of Visual Cliff The correct answer and explanation is : Visual Cliff Definition: The term Visual Cliff refers to a psychological experiment that is used to study depth perception in infants and animals. It involves a “cliff” that is created by placing a transparent glass

Your credit card company charges you 1.13 percent per month. What is the annual percentage rate on your account? The correct answer and explanation is : To calculate the annual percentage rate (APR) when you are given a monthly interest rate of 1.13%, you can use the formula that converts the monthly rate to an

Which of the following sentences correctly use commas after prepositional phrases? A.The birds were singing, in the forest. B. During the week I get coffee most days. C. Until next year, the election will be all over the news. D. As predators, cats are very deadly; some successfully catch up to 75% of the prey

For each reaction, identify the Bronsted-Lowry acid, the Bronsted-Lowry base, the conjugate acid, and the conjugate base. HBr(aq) + H2O(l) → H3O+(aq) + Br−(aq) NH3(aq) + H2O(l) → NH4+(aq) + OH−(aq) HNO3(aq) + H2O(l) → H3O+(aq) + NO3−(aq) C5H5N(aq) + H2O(l) → C5H5NH+(aq) + OH−(aq) Express your answers as chemical expressions. Enter your answers in

The image seen in a plane mirror is located A. at the surface of the mirrorB. behind the mirrorC. in front of the mirrorD. at the position of the object The correct answer and explanation is : Correct Answer: B. Behind the mirror Explanation: A plane mirror creates a virtual image of an object placed