Period+5+Chemistry

= =
 * Period 5 Chemistry page **

=Magnesium Oxide Lab= Michael Truong, John Hritz, Sonia Lee, Roxanne Eramela

[|http://www.youtube.com/watch?v=IKGjLbpXtdY] =**The BEST Magnesium Oxide Lab Video. :D**=

with Bryan, Jose, Kristine, and Joe! http://www.youtube.com/watch?v=ptUR3VWqJRc

=**Magnesium Oxide Lab Video. :D**= with Rolando, Yvett, Serena, and Krystal @http://www.youtube.com/watch?v=0oVHsWT5np8

**Magnesium Oxide Lab Video! **

 * by Carl, Nando, Clint, and James **

The wiki wouldn't let us embed the video because the file was too big so we give you the youtube link to the video! :D Enjoy!

**Magnesium Oxide Lab Video!**
by Rigoberto, Michael E., Carlos, and Eric

The wiki wouldn't let us embed the video because the file was too big so we give you the youtube link to the video! :D Enjoy!

http://www.youtube.com/watch?v=V6aIgL9VIbs <---CLICK

_

**OUR MAGNESIUM OXIDE LAB VIDEO!**

**BY: MATTHEW DO, JANA LEE, STEFANIE SAFLOR, DAVID RADICH**

http://www.youtube.com/watch?v=4kj_NjtaEdo <- **CLICK THIS ONE**

Magnesium Oxide Lab Video -Kristia, Adriana, Austin & Nicole http://www.youtube.com/watch?v=WZSzT2tOdGU

Magnesium Oxide Lab Video!
by Logan, Chris, Dana, and Myle

__The wiki wouldn't let us embed the video because the file was too big so we give you the youtube link to the video! :D__ __Enjoy!__

__@http://www.youtube.com/watch?v=flfpjTXSb1Q__

__**Krystal Here! I have posted a download link to this wiki.**__ __**You can download this wiki for future preferences. Just look at the discussion page.**__ __**it should be there. (:**__

__List of SI units__

__Length- meters__ __Volume- centimeters cubed__ __Temperature- Kelvin__ __Mass- kilograms__ __Substance- mole__ __Time- second__

__[]__ __How to convert from celsius to Kelvin: http://www.ajdesigner.com/phptemperature/temperature_equation_convert_c_k.php__

__Bryan, did you really make your username therealrigocarvajal? That's cool. Anyways, its rigo. I'm on government and I play basketball. Kbye. I love Jose, Jose didn't write this <33333__

__**Hey guys, it's Bryan Quibol here, I'm pretty sure Ms. Couling asked us to write a little bit about ourselves on here so I'm doing it! I play basketball and I like pizza! There ya go! **__

__** Scientific Notation **__

__** What? **__ __** -way of expressing really big numbers or really small numbers **__ __** -allows to compare numbers without losing track of all the zeros **__ __** Why? **__ __** -convert very large/very small numbers into Scientific Notation to express them in a more concise form **__ __** -converted numbers can be used in a computation with far greater ease **__ __** Different Parts: **__ __** Base & A power of 10 **__ __** n x 10^x **__ __** -the BASE can only be a number greater than 1 and less than 10 **__ __** Standard Form to Scientific Notation **__ __** step 1: place decimal point so that there's one non-zero digit to the left of the decimal point **__ __** step 2: count the number of decimal places the decimal point has "moved" from the original number; this will be the exponent on the 10 **__ __** step 3: if the original number was less than 1, then the exponent is negative; if it is greater than 1, the exponent is positive **__ __** Scientific Notation to Standard Form **__ __** step 1: move the decimal point to the right for positive exponent of 10 **__ __** step 2: move the decimal point to the left for negative exponent of 10 **__ __** *USE ZEROS TO FILL IN PLACES* **__

__** SCIENTIFIC NOTATION ON A CALCULATOR **__

__** Step 1: Punch the number (the digit number) into your calculator **__ __** Step 2: Push the EE or EXP button. Do NOT use the x (times) button!! (The EE=x10) **__ __** Step 3: Enter the exponent number. Use the +/- button to change its sign. **__

An Introduction to measurement study guide for period 5 __﻿Significant Figure Rules: __


 * __·__ __All non-zero digits are significant.__


 * __·__ __The digits are absolutely **certain**, plus **one more**.__


 * __·__ __0’s in the middle of a number__ are __**always** significant.__


 * __·__ __0’s in the **front** of a number are__ **NEVER** __significant.__


 * __·__ __0’s at the end of a number are **SOMETIMES** significant.__


 * __·__ __If a__ decimal point is present__, 0’s at the end **ARE** significant.__


 * __·__ __If a__ decimal point is **NOT** present__, 0’s at the end are **NOT** significant.


 * · Use scientific notation so you do not chop off number when asked to write the answer to a certain number of significant figures.

Significant Figure Calculations:
 * Multiplying & Dividing:
 * When carrying out multiplication of numbers or measurements your answer must be written to the lowest number of significant figures that were in the problem
 * 3g x 295 g = 900 g
 * Adding & Subtracting:
 * When adding or subtracting you need to give your answer to the lowest number of places past the decimal that were in the problem
 * 23.6 mL – 16.1218 mL = 7.5 mL
 * Combining:
 * The multiplication / division rule is the KING!
 * If you have to carry out division or multiplication and then addition or subtraction give your answer to the lowest number of sig figs that were in the problem.
 * 5.46 mg x 3.2 mg + 1.59 mg = 19 mg (2sf)
 * Metric Units**

Prefixes (easy to remember!)

Prefixes of Metric Units

The standard unit of length in the metric system is the meter. Other units of length and their equivalents in meters are as follows: 1 millimeter = 0.001 meter 1 centimeter = 0.01 meter 1 decimeter = 0.1 meter 1 kilometer = 1000 meters

We symbolize these lengths as follows: 1 millimeter = 1 //mm// 1 centimeter = 1 //cm// 1 meter = 1 //m// 1 decimeter = 1 //dm// 1 kilometer = 1 //km//

The standard unit of volume in the metric system is the liter. One liter is equal to 1000 cubic centimeters in volume. Other units of volume and their equivalents in liters are as follows: 1 milliliter = 0.001 liter 1 centiliter = 0.01 liter 1 deciliter = 0.1 liter 1 kiloliter = 1000 liters

From these units, we see that 1000 milliliters equal 1 liter; so 1 milliliter equals 1 cubic centimeter in volume. We symbolize these volumes as follows: 1 milliliter = 1 //ml// 1 centiliter = 1 //cl// 1 deciliter = 1 //dl// 1 liter = 1 //l// 1 kiloliter = 1 //kl//

The standard unit of mass in the metric system is the gram. Other units of mass and their equivalents in grams are as follows: 1 milligram = 0.001 gram 1 centigram = 0.01 gram 1 decigram = 0.1 gram 1 kilogram = 1000 grams

We symbolize these masses as follows: 1 milligram = 1 //mg// 1 centigram = 1 //cg// 1 decigram = 1 //dg// 1 gram = 1 //g// 1 kilogram = 1 //kg//


 * =====Mass=====

(“weight”)*
|| =====milligram===== || =====mg===== ||> =====1000 mg===== ||< =========== ||< =====1 g===== || And if you didn't like the information from above, here's this!
 * ^  || =====gram===== || =====g===== ||>   ||<   ||<   ||
 * ^  || =====kilogram===== || =====kg===== ||> =====1 kg===== ||< =========== ||< =====1000 g===== ||
 * ^  || =====metric ton===== || =====t===== ||> =====1 t===== ||< =========== ||< =====1000 kg===== ||

Another Website for reference: Common Metric Measurements

A Youtube Video... Video to the Basics of the Metric System


 * Dimensional Analysis:**



Direct and Indirect conversions: Direct conversion is like Ounces to Pounds, where it's just one straightforward conversion. Indirect conversion is where you have to convert it to something then convert it int something else to get your answer. Like Grams to Ounces to Pounds. -Units are very important when it comes to dimensional analysis. You have to make sure to always have the units. You must show your work because numbers by themselves mean nothing. - Remember to always have correct sig figs. - Conversion Process - Step 1- Multiply to the right - Step 2- Divide by the bottom number - Step 3- Make sure to have correct amount of sig figs P.S. MAKE SURE TO ALWAYS HAVE UNITS!!!!!!! Practice problems:
 * 1) 83.6 inches to centimeters.
 * 2) 30.2 Liters to Gallons.
 * 3) 243cm^3 to dm^3

You can find the answers on moodle. (:

Other helpful links: [] []

//**Accuracy vs. Precision**// is a theory used in chemistry, presented by Mrs. Couling. Scientists aim for measurements to be both accurate and precise.


 * Accuracy:** Accuracy refers to the measure of "rightness". By definition, accurate means "capable of providing a correct reading or measurement". A measurement is accurate if it correctly reflects the size of the thing being measured. Accuracy refers to how closely a measured value agrees with the correct value. Accuracy is correctness.


 * Precision:** Precision refers to the measure of "exactness". By definition, precise means "repeatable, reliable, getting the same measurement each time". Precision refers to how closely individual measurements agree with each other. Precision is repeatability.

Note: See the following analogy of measurements to arrows at a target. See that the X's are where the five arrows hit the target.




 * Accurate AND Precise**