Metallic Bonds: H.W.

Please follow the link below, read, watch video, and analyze before answering the questions. DUE NEXT CLASS

Metal worker shaping iron on an anvil

QUESTIONS: (Also found in the link)

  1. What are metallic bonds?
  2. How do metallic bonds relate to the properties of metals?
  3. The iron in the metal working picture above (Figure above) is red hot. Infer why the metalworker heats the iron when he shapes it.
  4. What is electricity? Why can metals conduct electricity?
  5. What can metals conduct besides electricity?
  6. How could you use an empty pop can to demonstrate that metals can bend without breaking?



Lewis Dot Diagrams

For tomorrow ( 01/23/18 ) :

  1. Watch the first video and takes notes of the rules for writing dot structures.
  2. Watch the second video analyze it and write down any questions you may have to discuss tomorrow in class
  3. Come ready to complete an activity on Lewis dot diagrams.





H.W. Acceleration

Show your work

  1. What is the acceleration of a car that travels south and speeds up from 20m/s to 65 m/s in 30s?

2. If car A goes from 10 to 85 meters in an hour and car B goes from 5 to 25 meters in 20 mins. Who has the greatest acceleration?

3. Emely ran half of 3 meters in 10s , then twice that distance in 8 seconds. At the end of her race, she ran the last 15 meters in 15 seconds.

  • What was Emely’s  velocity during the first , second and last intervals, average velocity,  and acceleration?
  • Draw a graph for Emely’s race.

4. What is the difference between constant acceleration and constant velocity.




The Sun : H.W.

  • Due Date 9th A: Mon. 16th
  • Due Date 9th B: Tues. 17th

Please copy the following notes into your notebooks. These will be you end of the chapter review.

The Sun is not solid, nor is it a typical gas. Most atoms in the Sun exist as plasma.

  • The Sun’s central core is plasma with a temperature of around 27 million°C. At such high temperatures hydrogen combines to form helium by nuclear fusion, a process that releases vast amounts of energy. This energy moves outward, towards the outer layers of the Sun.
  • The energy released in the core travels extremely slowly through the radiative zone.
  • In the convection zone, hot material from near the radiative zone rises, cools at the Sun’s surface, and then plunges back downward to the radiative zone. Convective movement helps to create solar flares and sunspots.

After watching this video , please answer the questions found below.

  1. The Sun is very dense, so is there solid matter at the center? Why or why not?
  2. What are the inner layers of the Sun and what are their characteristics?
  3. What are the outer layers of the Sun and what are their characteristics?
  4. What powers the Sun?

Resultado de imagen para the sun


Moles and Grams: H.W.

What are the molecular weights of the following compounds?

  1. H2O
  2. NaOH

Calculate the following:

  1. How many moles are in 22 grams of argon?
  2. How many grams are in 88.1 moles of magnesium?
  3. How many moles are in 2.3 grams of phosphorus?
  4.  How many grams are in 11.9 moles of chromium?



Interstellar Bodies: H.W.

  1.  Follow the link below and complete the vocabulary, copy the summary and answer the questionnaire found in this link after reading and watching the video.

2.  Draw a comet and label its parts with a short description of each.


outer space


Average Atomic Mass: H.W

Follow the link below and after watching the video provided answer questions 2 and 3 found below the video.

Calculate the following Average atomic mass remember to show your work:

  1. Neon has two major isotopes, Neon-20 and Neon-22. Out of every 250 neon atoms, 225 will be Neon-20 (19.992 g/mol), and 25 will be Neon-22 (21.991 g/mol). What is the average atomic mass of Neon?
  2. In a sample of 200 Chlorine atoms, it is found that 151 are Cl-35 (34.969 amu), and 49 are Cl-37 (36.966 amu). What is the average atomic mass of Chlorine?
  3. Without doing any math, are there more Bromine-79 atoms or more Bromine-80 atoms on earth? (Hint: look at the periodic table.)

average atomic mass