12.14.08
7th Grade Exam Questions
Hello 7th graders,
If you have any questions about an exam topic, please post it here. I will review these each night and either answer your questions on the blog or address them in class tomorrow. Also, if you see a classmate’s question and know the answer, feel free to post it! This is the best way to make sure that you get the most out of our class review time so use it wisely.
-Mr. K
December 16, 2008 at 5:49 pm
Mr. K-
Could you post a few neutralization reactions with the answers on the blog for us to try?
Thanks,
Jake
December 16, 2008 at 6:15 pm
hey
can you do salt stuuf and those formulas were you even the element i think out? i dont get it.
December 16, 2008 at 7:22 pm
Mr K.,
Could you maybe put some unit conversion parts and maybe on Bernoulli’s and Pascal’s principle.
sincerely,
Reagan
December 16, 2008 at 7:31 pm
Mr. K,
I don’t really understand the unit conversions, do you think that maybe you could go over them in class tomorrow?
Thanks,
Chris
December 16, 2008 at 8:17 pm
Can you go over Ionic Compounds in class tomorrow? When you have to provide the chemical formula for different compounds.
December 16, 2008 at 9:31 pm
hey Mr. Kremer,
what kind of calculations are going to be on the test?
-maddie
December 16, 2008 at 9:32 pm
Students,
What are the products of any neutralization reaction?
Give the products of the following reactions
1) Ca(OH)2 + HCl
2) NaOH + H2CO3
3) HNO3 + KOH
-Mr. K
December 16, 2008 at 9:47 pm
Mr. K-
The products of any reaction are H20 and a salt. I know how to solve the formulas but I was wondering about those numbers in between. How do we figure out which number goes where and why it goes there?
Thanks,
Jake
December 16, 2008 at 9:54 pm
Mr K.-
Sorry for all the questions, but I would like to fully understand what we need to know.
On the study guide, you said “‘phases of matter” and “classification of matter”, what do you mean by these?
-Jake-
(Mr. K’s top contributor)
December 16, 2008 at 9:54 pm
Jake,
you have to look at the ionic charge of the two parts of the salt. You can get these from the periodic table.
-Mr. K
December 16, 2008 at 10:08 pm
Phases of matter – solid, liquid, gas, plasma
Classifications of matter (more terms) – malleable, ductile, crystal, …
Keep ‘em comin’
-Mr. K
December 16, 2008 at 10:23 pm
Mr. K-
Thanks for the part about the phases, but the neutralizations…those are still confusing to me. I don’t see how to find the charge and how it affects the products. Are there going to be any on the test where we will have to know how to use the charge?
-Jake
December 17, 2008 at 7:35 pm
what are SI units???
natalie
December 17, 2008 at 7:42 pm
Mr. Kremer,
How do you convert Celcius and Kelvin?
- Matt M.
December 17, 2008 at 7:50 pm
he7y-
for classifying metals, nonmetals, and mettaloids, will we be able to use a periodic table? if we want to can we use the ones in our agendas? and alllllll we need to know is on the study guide, right?????
December 17, 2008 at 7:54 pm
oh and i still dont get the neutralization thing with the hydrogen, can i like get to school early and have you go over it with me? oh and how many tests have we had in the past?
December 17, 2008 at 8:16 pm
HEY-
mr. k,
i still dont get the unit conversion thing. i know how to do the m c d d d h k line thingy but i dont know how to get the number!! please answer quickly because i want to do good on this test and go over this a little more.
thanks,
Shortie
December 17, 2008 at 8:17 pm
To Natalie,
The standard system of measurement that scientist use worldwide. It is called the International System of Units. The SI Units are based on the number 10.
I think that is about all…
Cheers
Hope V.
December 17, 2008 at 8:23 pm
Matt,
The magic number for Kelvin to Celsius and the other way around is 273. You either add or subtract 273. Going from Celsius to Kelvin you add 273. When you go from Kelvin to Celsius you subtract 273.
The was I remember is:
* C -> K is up in the alphabet so you add
* K -> C is down in the alphabet so you subtract
-Mr. K
December 17, 2008 at 8:25 pm
Regan,
You will have the periodic table. Please use it on every question you can. it would be good for classifying bond types b/c ionic is metal-nonmetal, metallic is metal-metal, and covalent is nonmetal-nonmetal.
-Mr. K
December 17, 2008 at 8:28 pm
Shortie,
“i know how to do the m c d d d h k line thingy but i dont know how to get the number!!”
I think you mean that you need to jump your decimal left or right depending upon how many spot you hop on the number line.
-Mr. K
December 17, 2008 at 8:29 pm
Hope,
Great Explanation!
-Mr. K
December 17, 2008 at 8:42 pm
Mr. K,
Thanks a bunch! Will that be on the 7th grade test?
– Matt M.
December 17, 2008 at 8:57 pm
Yes, that it was i mean Mr.K, but i don’t get how i get the exact number?
Jessica
PS. Will you give me an example and the answer?
December 17, 2008 at 9:16 pm
Jessica,
check the unit conversion post. The answers are in the comment section.
-Mr. K
December 17, 2008 at 9:19 pm
Reagan,
Sorry that I didnt discuss Bernoulli and Pascal today in class. I didnt have time. The key to each is that you understand where the pressure is and what it does.
Bernoulli – the pressure is less where the fluid is moving more quickly. In a wing/spoiler it is less where the bulge is on the wing.
Pascal – the pressure will equalize in a closed container. If you push on one side it will cause an increased pressure on the other.
-Mr. K
December 17, 2008 at 9:21 pm
7th Graders,
I have PSIA science in the morning so I cant do too much tutoring in the am.
-Mr. K
December 17, 2008 at 9:27 pm
I have it!
Neutralization Reactions:
1) 2(H20) + CaCl
2) H20 + NaCO3
3) H20 + KNO3
Thanks for the help today.
-Jake
December 17, 2008 at 9:36 pm
I still dont get what an si unit is ??? is it like inches or feet????
thanks,
natalie
December 17, 2008 at 9:39 pm
Nevermind I found it in the book!
THanks anyway<
NAtalie
December 17, 2008 at 9:42 pm
Natalie,
SI units are the units used ’round the world by scientists. They are the System International. These consist of base units like grams, meters, liters, kelvin, and seconds. Then, when converting something (e.g. grams), to some other form, you use this chart.
!
__________________________________________________________
Milli Centi Deci BASE Deka Hecto Kilo
You find your answer by the conversion factor. If you are going from milligrams to grams, you count how many steps from milli to base–3. Then are you going from a large to a small or a small to a large? Small to large, so you move your decimal left.
Ex. 3500 mg = _____________ g
Move your decimal three times left on 3500 and you get 3.5 grams.
I hope this makes sense.
-JAke
December 17, 2008 at 9:43 pm
hey- o.k.
imfeakin out cuz i dont get si unit conversions, the hydrogen canceling, and you put too much on this test!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! i am going to be mad at you for a longgg time if i dont do well.
December 17, 2008 at 9:47 pm
hey jake-
that post really helped me alot!! and it does make sense. i get it now!! yay!!
thanks,
ana
December 17, 2008 at 9:50 pm
You are welcome Ana.
Glad to help!
December 17, 2008 at 9:55 pm
OMG!!!! thank you sooo much jake!!!!!! im not even kidin!!!! you are my best friend right now!!!!!
December 17, 2008 at 10:00 pm
ooooooo! Thanks sooo much Jake! I understand it now!
jESSICA
December 17, 2008 at 10:03 pm
Ya thanks Jake for the help it really made sence. I just spilled water all over my keyboard whoops!! HAHA
Thanks,
NAtalie
December 17, 2008 at 10:10 pm
WOW!! You do not know how much that helped! It makes a whole lot more sense now! WHAT A RELIEF! Gosh! ….
Luv ya 4ever now!
Hope
December 17, 2008 at 10:35 pm
Where do you find the classifications of matter???
Thanks,
NAtaloie
December 17, 2008 at 10:37 pm
For unit conversions just use your number line. Jake’s post explains it well. In order to remember the order of the prefixes here is a memory aid:
King Henry Died Merrily Drinking Chocolate Milk
(kilo) (hecta) (deca) (BASE) (deci) (centi) (milli)
just flip the order!
-Mr. K
December 17, 2008 at 10:38 pm
Natalie,
Mr. K said:
“Classifications of matter (more terms) – malleable, ductile, crystal
, …
”
-Jake
December 17, 2008 at 10:39 pm
Natalie,
Look in the section of the book called “Properties of matter”
Here are some key terms
metallic/nonmetallic/metalloid
Ductile/Malleable/Alloy
solution/mixture
-Mr. K
December 17, 2008 at 10:44 pm
HEY-
are the classifications of matter the same thing as the classifications of metals like hardness, shininess, malleability, and ductility?? cause i cant find anything about classifications of matter in the book!
thanks,
ana
December 17, 2008 at 10:45 pm
wait nevermind… i think i found it
ana
December 17, 2008 at 10:45 pm
Ana,
You are on the right track.
-Mr. K
December 17, 2008 at 10:54 pm
on the periodic table, do the transition metals have 2 or 3 valence electrons?
-ana
December 17, 2008 at 11:19 pm
Thanks Jake! I didn’t get it before, but I do now!
Chris
December 17, 2008 at 11:36 pm
Ana,
it depends on the element. i wont ask you that on the test.
-Mr. K
December 17, 2008 at 11:58 pm
hey- so for neutralization i think i finaly get it…… o the review what do you mean by, “interpreting diagrams”? and is “calculations” the same thing as neutralization?????
December 18, 2008 at 12:00 am
oh and will you have those annoying short answer questions?????
December 18, 2008 at 6:48 am
Regan,
“hey- so for neutralization i think i finaly get it…… o the review what do you mean by, “interpreting diagrams”? and is “calculations” the same thing as neutralization?????”
think back to our review. There are no tricks on the exam. Most of the interpreting diagrams section is periodic table and pH scale.
“oh and will you have those annoying short answer questions?????”
If you mean those awesome short answer questions where you have to demonstrate your understanding of fundamental concepts…. No.
-Mr. K