Exams & Certification

The density of a sample of crude oil is 700 kg/m3. Calculate the API gravity. Determine the classification of the crude oil The Correct Answer and Explanation is: To calculate the API gravity of a crude oil sample, we use the following formula: API gravity=141.5SG at 60°F−131.5\text{API gravity} = \frac{141.5}{\text{SG at 60°F}} – 131.5API gravity=SG at 60°F141.5​−131.5 Where: Step 1: Calculate […]

what mixed fraction is 1/3 of 100 The Correct Answer and Explanation is: Correct Answer: 13\frac{1}{3}31​ of 100 is 33 13\frac{1}{3}31​ as a mixed fraction. Explanation: To find one-third of 100, we multiply: 13×100=1003\frac{1}{3} \times 100 = \frac{100}{3}31​×100=3100​ This result, 1003\frac{100}{3}3100​, is an improper fraction because the numerator (100) is greater than the denominator (3).

1_ Find the determinant of the following matrix ~1 A = 5 ~1 2 ~1 3 3 -3 4 2 Use Cramer’s Rule to solve the following matrix ~X1 + 2X2 + 3×3 =2 5×1 X2 ~ 3×3 = 53 ~X1 + 3×2 + 4X3 =1 The Correct Answer and Explanation is: We are given

let a be a 3×2 matrix and b a 2×3 matrix. show that c = a.b is a singular matrix. The Correct Answer and Explanation is: Let matrix AAA be a 3×23 \times 23×2 matrix and matrix BBB be a 2×32 \times 32×3 matrix. Then, the product C=ABC = ABC=AB is defined and results in

Draw Lewis dot structure for CH4 The Correct Answer and Explanation is: Lewis Dot Structure for Methane (CH₄): The Lewis dot structure for methane is: H | H – C – H | H Explanation Methane (CH₄) is a simple molecule that consists of one carbon atom and four hydrogen atoms. To understand its Lewis

Show how to draw Lewis dot structures for the balanced reaction of the combustion of methane (CH4). Show how to draw the Lewis dot structures for the balanced reaction of the combustion of ethanol (C2H5OH). Show how to draw Lewis dot structures for the balanced reaction of the combustion of hydrogen (H2). The Correct Answer

The lewis dot structure for methane, CH, is shown. The reason that the 4 hydrogen atoms are bonded to a central carbon atom is: H H \text{:} C \text{:} H H Carbon has only 2 valence electrons. Hydrogen can only bond to atoms other than itself. Carbon can only accommodate single bonds when bonded to

Use the VSEPR model to predict the geometry and approximate bond angle of the following molecules and ions: a) AsH3, b) OF2, c) AlCl4-, d) I3-, e) C2H4 Explain each prediction. The Correct Answer and Explanation is: To predict the geometry and approximate bond angles of molecules and ions using the Valence Shell Electron Pair

What is the electron domain geometry (EDG) and molecular geometry (MG) of AsH3? A. trigonal bipyramidal, T-shaped B. tetrahedral, trigonal pyramidal C. trigonal planar, trigonal pyramidal D. octahedral, T-shaped E. tetrahedral, tetrahedral The Correct Answer and Explanation is: Correct Answer: B. tetrahedral, trigonal pyramidal Explanation: Arsine (AsH₃) is a molecule made up of one arsenic

What is the molecular geometry of the compound AsH3? The Correct Answer and Explanation is: The molecular geometry of arsine (AsH₃) is trigonal pyramidal. Explanation: Arsine (AsH₃) consists of one arsenic (As) atom bonded to three hydrogen (H) atoms. To determine the molecular geometry, we use Valence Shell Electron Pair Repulsion (VSEPR) theory. This makes