Exams & Certification

Khan Academy Active Past Basic multi-digit division 87 \div 17 = \text{ remainder } The Correct Answer and Explanation is: Of course. Here is the solution to the math problem shown in the image, along with a detailed explanation. Correct Answer:87 ÷ 17 = 5 remainder 2 Explanation The problem asks us to solve the […]

Write the electron configurations for both Mo and Mo4+ Cele The Correct Answer and Explanation is: The electron configuration of an element gives the distribution of its electrons in atomic orbitals, following the principles of the Aufbau principle, Pauli exclusion principle, and Hund’s rule. Let’s go through the electron configuration of both the neutral molybdenum

How many d electrons are in the valence shell of the Mo4+ cation? How many unpaired electron spins The Correct Answer and Explanation is: To determine the number of d electrons in the valence shell of the Mo4+ cation, we need to follow these steps: Step 1: Determine the Electron Configuration of Mo Molybdenum (Mo)

 Oxygen gas (O2(g)) has a density of 0.00111 g/cm3 at room temperature and 1 atmospheric pressure . Oxygen gas () has a density of 0.00111 g/cmat room temperature and 1 atmospheric pressure. If you had 1 gallon of pure oxygen gas, how much would that amount weigh in pounds? Hint: 1 gal = 3.78 L and

Trisilane (Si3H8) is a liquid with a density of 0.739 g cm-3. It reacts with oxygen to give silicon dioxide (SiO2) and water. Calculate the mass of water that would form if 26.9 cm3 of trisilane reacted completely with excess oxygen. _________g water The Correct Answer and Explanation is: To calculate the mass of water

A. Lewis Structures Review Lewis Structure Review Draw the Lewis structure of the following molecules and match the molecule with its structural characteristics: Drag and drop options on the right-hand side and submit. For keyboard navigation… SHOW MORE CH4 HS2 NH3 3 bonding electron pairs; 2 lone electron pairs 1 bonding electron pairs; 3 lone

The Correct Answer and Explanation is: The correct coordinate pairs that are solutions to the inequality are:A (0, 0)B (5, 0)G (-5, -9) To determine which coordinate pairs are solutions to the inequality 5x + 9y < 45, we must substitute the x and y values from each given pair into the inequality. If the

The Correct Answer and Explanation is: The correct choice is:A. The solution is (0, -5). To solve the system of equations using the substitution method, we first need to isolate one variable in one of the equations. The given system is: The second equation, 5x – y = 5, is the easiest to rearrange to solve

How many unshared electrons are found in the lewis dot structure of Carbon Dioxide or CO2? The Correct Answer and Explanation is: In the Lewis dot structure of Carbon Dioxide (CO2), there are 4 unshared electrons. Here’s how we determine this: Step 1: Count the total number of valence electrons Carbon (C) has 4 valence

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