Exams & Certification

an oxygen atom with 10 neutrons Express your answer as an isotope an isotope with four protons and five neutronsExpress your answer as an isotope. an isotope with 25 electrons and 28 neutronsExpress your answer as an isotope. The Correct Answer and Explanation is : To express the isotopes as requested, let’s go through each […]

Name Mg3(PO4)2 • 4H2O and write the formula for calcium nitrate trihydrate. The Correct Answer and Explanation is : Magnesium phosphate tetrahydrate is the name for the compound with the formula Mg₃(PO₄)₂ • 4H₂O. The “• 4H₂O” represents four molecules of water of crystallization, also known as water of hydration, that are part of the

The freezing point of mercury is -38.8 C . What quantity of energy, in joules, is released to the surroundings if 1.00 mL of mercury is cooled from 23.0 C to -38.8 C and then frozen to a solid? (the density of liquid mercury is 13.6 g/cm3. Its specific heat capacity is 0.140 J/g*K and

The specific heat of mercury is 0.140 J/g °C. Calculate the heat necessary to raise the temperature of one mole of liquid mercury by 36 °C.1- The specific heat of mercury is 0.140 J/g°C. Calculate the heat necessary to raise the temperature of one mole of liquid mercury by 36 °C.  a) What if

When a hammer and a feather are dropped from the same moment at the same time on Earth, the hammer hits the ground before the feather. When a hammer and feather are dropped on the Moon from the same height and at the same time, they fall slower and hit the ground at the same

What is the molecular geometry of (H2O)?What is the electron geometry of (H2O)? (The electron geometry takes into account the lone pair electrons as if they were atoms).What is the formal charge of each hydrogen and also the oxygen in this water molecule? The Correct Answer and Explanation is : The water molecule (H₂O) exhibits

Which of the following is not a valid SQL statement? a. SELECT MIN(pubdate) FROM books GROUP BY category HAVING pubid = 4; b. SELECT MIN(pubdate) FROM books WHERE category = ‘COOKING’; c. SELECT COUNT(*) FROM orders WHERE customer# = 1005; d. SELECT MAX(COUNT(customer#)) FROM orders GROUP BY customer#; The Correct Answer and Explanation is :

i)Which of the following is not a valid SQL command?a. UPDATEb. SHOWc. SELECTd. INSERTe. All of the abovef. None of the above ii)Which of the following commands list columns of a table in MS SQL?a. DESCRIBEb. DESCc. EXEC SP_TABLEd. EXEC SP_COLUMNSe. All of the above.f. None of the above. The Correct Answer and Explanation is

Use The Tangency Rule To Determine The Cost-Minimizing Bundles Of Labor And Capital For A Japanese Synthetic Rubber Firm’s Production Function, Q = LO.5K0.5 (Flath, 2011), Where W= $20 And $10 At The Cost-Minimizing Bundle As A Function Of L, K= 2L How Does Your Answer Change If W= $40 And R= $5? At The

An SRS of size 30 is taken from a population if size 100.(a) What is the sampling weight for each unit in the sample?(b) It is known that the sample mean is 8.23. What is the estimate of population total?(c) It is known that, the sample variance is 16. Calculate estimated variance V(t). Doesfpe make