exam 1 - Version 250 – Exam 1 TTh – Sutcliffe –(50985...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Version 250 – Exam 1 TTh – Sutcliffe – (50985) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Arrange the following types of photons of elec- tromagnetic radiation in order of decreasing energy: red light, radio, x-rays, γ-rays, in- frared. 1. γ-rays > x-rays > radio > infrared > red light 2. radio > red light > infrared > x-rays > γ-rays 3. x-rays > γ-rays > red light > infrared > radio 4. x-rays > red light > infrared > γ-rays > radio 5. γ-rays > x-rays > red light > infrared > radio correct Explanation: E = h c λ Decreasing energy means increasing wave- length; the order is γ-rays (shortest, high- est energy), x-rays, red light, infrared, radio (longest, lowest energy). 002 10.0 points What is the name of the compound with the formula CCl 4 ? 1. carbon(IV) chloride 2. carbon tetrachloride correct 3. chlorine carbonide 4. carbon chloride Explanation: This is a covalent compound and should be named using prefixes to indicate the number of atoms of each element in the compound. Binary covalent compounds are named with the name of the first element followed by the name of the second element with the suffix “-ide” added. CCl 4 is carbon tetrachloride. 003 10.0 points The organic compound CH 3 CH 2 CH 3 is called 1. ethane. 2. methane. 3. propane. correct 4. pentane. 5. butane. Explanation: 004 10.0 points Which of the following atoms would have the smallest size (atomic radius)? 1. S 2. Li 3. B 4. O correct 5. N Explanation: Atomic radii become smaller as you move from left to right across a row, and also smaller as you move up a column. Diagonal relation- ships can be tricky, especially when you have to decide which of the two relationships will be the most important. Here, luckily, the comparison works well. The smallest radius here would then belong to the element which sits closest to the top right corner of the peri- odic table, which is O in this example. 005 10.0 points A visible light photon has a than a photon of microwave radiation. Version 250 – Exam 1 TTh – Sutcliffe – (50985) 2 1. lower speed 2. greater speed 3. lower energy 4. higher frequency correct 5. longer wavelength Explanation: 006 10.0 points An electron has a fairly well defined position with an uncertainty of only 10 − 10 m. What would the minimum uncertainty in the elec- tron’s velocity be? (A electron has a mass of 9 . 1 × 10 − 31 kg) 1. 4 . 6 × 10 5 m · s − 1 2. 5 . 3 × 10 5 m · s − 1 3. 3 . 5 × 10 5 m · s − 1 4. 5 . 8 × 10 5 m · s − 1 correct 5. 6 . 1 × 10 5 m · s − 1 Explanation: Δ x ( m Δ v ) ≥ h 4 π Δ v ≥ h 4 πm Δ x ≥ 6 . 626 × 10 − 34 J · s 4 π (9 . 1 × 10 − 31 kg)(10 − 10 m) ≥ 5 . 8 × 10 5 m · s − 1 007 10.0 points Knowing that at 0 ◦ C the density of ice is 0.917 g/cm 3 , calculate the volume occupied by 100 grams of ice at 0 ◦ C....
View Full Document

This note was uploaded on 04/03/2011 for the course CHEMISTRY 301 taught by Professor Mccord during the Spring '10 term at University of Texas.

Page1 / 8

exam 1 - Version 250 – Exam 1 TTh – Sutcliffe –(50985...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online