Exams & Certification

Ice skaters Jerry (73.6 kg) and Rachel (38 kg) initially stand at rest, Rachel pusties Jerry with a force of 59.3 N for 0.224 5. What is Rachel’s speed (relative to ground as they move away from each other? The friction is negligible. The Correct Answer and Explanation is : Rachel’s speed relative to the […]

STRONG AND WEAK ACIDS HCl is a strong acid. HF is a weak acid. The process of an acid donating a proton to water is called ionization. CRITICAL THINKING QUESTIONS 1. Is HCl a strong or a weak acid? Is HF a strong or a weak acid? HCL is strong and HF is WEAK The

A certain radioactive substance decays exponentially with yearly decay factor of 0.93. There are initially 107 grams present. The Correct Answer and Explanation is : The decay of a radioactive substance follows the exponential decay formula: [A(t) = A_0 \times (decay \ factor)^t] where: Correct Answer: The equation describing the decay of the given substance

A certain radioactive substance decays exponentially. The percent, P, of the substance left after years is given by the function P() = 100(1.32). Determine the instantaneous rate of decay at the instant the half life of the substance is reached. The Correct Answer and Explanation is : The given function appears to be incorrectly formatted.

In a neutralization reaction between acetic acid and barium hydroxide, 13.25 mL of a 0.125M Ba(OH)_2 solution was required to neutralize 10.35 mL of an acetic acid solution. What is the molarity of the acetic acid solution? You will need to write and balance the equation for the neutralization reaction first. The Correct Answer and

A penny has a density of 7.20 g/cm3. How much copper is contained in a penny that is 2.50% (by weight) of copper? Recall that a penny has a diameter of 19.05 mm and a thickness of 1.52 mm. The Correct Answer and Explanation is : The mass of copper contained in the penny is

What do the following lines CONVEY ? Midnight, not a sound from the pavement. Has the moon lost her memory ? She is smiling alone. In the lamp light the withered leaves Collect at my feet And the wind begins to moan a. Confusion b. Optimism c. Loneliness d. Eagerness The Correct Answer and Explanation

If the Bonds Payable account has a balance of $700,000 and the Discount on Bonds Payable account has a balance of $36,000, what is the carrying value of the bonds? Solve What are the basic ownership rights of common stockholders in the absence of restrictive provisions? Solve The Correct Answer and Explanation is : Solution

A discount on bonds payable:Increases the Bond Payable accountOccurs when a company issues bonds with a contract rate more than the market rateDecreases the total bond interest expenseOccurs when a company issues bonds with a contract rate less than the market rateIs not allowed in many states to protect creditors The Correct Answer and Explanation

What is the role of dNTPs in a PCR reaction? a. They determine which region of the chromosome will get amplified b. They denature the DNA c. They provide the correct and salt concentration for taq to function d. They separate the double-stranded DNA into separate strands e. They are the four individual deoxyribonucleotide building