Biology - February 2007

yeah

2007-02-21 13:32:33 · 4 answers · asked by Anonymous

ONCE AGAIN DISREGARD..I CAN'T PRINT OUT ON MY PC..&EVERYTHING'S BLOCK IN MY SCHOOL EXCEPT FOR THIS WEBSITE..AND I CAn'T EVEN USE THE YAHOO MAIL THANKS

Pre-lab Questions:
1. Production or absorption of heat or emission of life, production of sound, change of color, formation of precipitate or new product and release of gas.
2. a. Combustion- burn in the presence of oxygen to produce carbon dioxide and water (release of gas)
b. Decomposition- breaking down of a compound
c. synthesis- two elements or compounds combined together
d. single replacement- (compound and element)
e. double replacement- (compound and compound)

Reaction #1

OBSERVATION:
light and white

EVIDENCE:
it turned pink

REACTION:
decomposition

Reaction #2
OBSERVATION:
magnesium is silver, thin and malleable

EVIDENCE:
magnesium turned bright white light

REACTION:
synthesis

Reaction #3
OBSERVATION:
clear and liquid

EVIDENCE:
it evaporated and it turned into gas

REACTION:
combustion

Reaction #4
OBSERVATION:
powder and liquid

EVIDENCE:
change of color, it turned into milky and bubbly

REACTION:
double replacement

Reaction #5
OBSERVATION:
copper is metal, silver nitrate liquid and clear

EVIDENCE:
turned ash, silver and rusted

REACTION:
single replacement

Post-lab Questions:
1. It turned silver on the surface of the copper coil when it was placed in the silver nitrate.
2. The silver nitrate solution separated and the silver combined with copper and the silver nitrate turned ashy.
3. The gases produced were oxygen, carbon dioxide and hydrogen.

Analysis:
1. sodium bicarbonate= sodium + bicarbonate
Na2(HCO3)= Na + 2 (HCO3)
2. Mg+ -->
3. Butane 02--> C02 + H20
4. calcium chloride + sodium carbonate --> calcium carbonate + sodium choloride
CaCl2 + Na2(C03) --> Ca(C03) + NaCl
1 Ca 1
2 Cl 1
2 Na 1
3 O 3
CaCl2 + Na2(C03) --> Ca(C03) + 2 NaCl
1 Ca 1
2 Cl 2
2 Na 2
3 O 3

5. Copper + Silver Nitrate -->

Cu + Ag(NO3) --> Ag + Cu(NO3)2
1 Cu 1
1 Ag 1
1 (NO3) 2
2 Ag(NO3) + Cu -->Cu(NO3)2 + 2 Ag
1 Cu 1
2 Ag 2
2 (NO3) 2

LAB CONCLUSION

The purpose of this lab is to determine the different types of chemical reactions, how they work and their differences. There are five different types of chemical reactions which are the combustion, synthesis, double replacement, single replacement and decomposition. In this lab, there were many indications that a chemical reaction has occurred. The indications that it occured are evaporation, change in color, formation of new product, release of gas etc.
Decomposition occurred on the first reaction when the substance evaporated while heated, leaving the other substance by itself. Combustion occured when it evaporated and the release of gas showed that a chemical change occurred. Synthesis occured when a new substance formed. Double replacement occurred the two compounds were switched. Single replacement occurred when the silver combined with the copper leaving the nitrate solution by itself.

2007-02-21 13:28:19 · 1 answers · asked by Anonymous

During respiration, glucose is "burned" to release energy. This energy is stored in molecules called
A. ATP
B. DNA
C. RNA
D. proteins

2007-02-21 13:14:19 · 7 answers · asked by exxohh<3 1

2007-02-21 12:48:11 · 4 answers · asked by Anonymous

2007-02-21 12:45:41 · 6 answers · asked by Anonymous

TRUE or FALSE?

2007-02-21 12:36:39 · 4 answers · asked by Anonymous

As I was taught in High School, hair is there to keep the body warm.
Now I've noticed that if I shaved my armpits the hair will grow back to the same length as before, but will not grow any further (I've never seen people with armpit hair reaching their ankles).

Yet hair on our heads grow a lot longer than that. So how does the body know when to stop the hair growth?

Also if hair grows to a certain length and stops, and if it is made to warm body parts, how come the hair on heads can get so long? Surely if the hair grows past shoulder length it won't protect the head even if it gets longer...

2007-02-21 12:28:16 · 5 answers · asked by Chris T 1

4. A monohybrid cross is a mating that considers one pair of contrasting traits. TRUE

5. Cross-pollination assures that each variety of garden pea is true-breeding. FALSE

6.The P generation consists of the first two individuals that are crossed in a breeding experiment. TRUE

7. In Mendel's experiment in which he cross-pollinated two P generation plants that had contrasting forms of a trait, F1 generation showed both forms of the trait. TRUE

8. The F2 generation in Mendel's experiment was obtained by cross-pollinating the F1 generation. FALSE

9. The F2 generation in Mendel's experiment showed both forms of the trait in a ratio of 1:1. FALSE

8. If the allele for yellow peas is Y, the allele for the contrasting trait, geen peas, is ____. I got y from the book (but i misread things alot) Smarties' answer was x....????

3. The genes for a trait are always located at a single place on a chromosome. TRUE

Thanks, I have a few more...

2007-02-21 12:27:07 · 2 answers · asked by mahbabesgrl 1

why arent they millions upon millions of skeletal remains of every step between one species and all the other species that we now see today? there should be a clear map from one ancient being to its modern counterpart and there should be enough of these skeletal "maps" to display one in every school in the country. why is it that all we see are fragments and incomplete skeletons most of the time?

2007-02-21 12:21:42 · 8 answers · asked by whosajiggawhat? 2

2007-02-21 12:17:37 · 2 answers · asked by Anonymous

2007-02-21 12:02:50 · 4 answers · asked by Y_Meen 1

2007-02-21 11:58:55 · 2 answers · asked by CHAREE J 1

2007-02-21 11:53:45 · 19 answers · asked by Girlygirl 1

what would Dariwin say to Mendel

2007-02-21 11:48:34 · 5 answers · asked by fevbstsith 1

2007-02-21 11:46:49 · 6 answers · asked by loveq9z 1

2007-02-21 11:38:11 · 4 answers · asked by iHEARTjuicy 1

1. what is mitosis?
2 in order, what are the four main stages of mitosis?
3 what is the main event of interphase?\
4. wha is the mane of the stage a cell goes throught just prior to maitosis?
5. what are two important events of prophase?
6 what is the main event of metaphase?
7 what is the main event of anaphase?
8 what are two important events of telephase?
9 what structure is involved in moving chromosomes during mitosis?
10 at the completion of mitosis when the cell divides, what name is given to the 2 new cells?
11 you began life as a one-called structure called a zygote. what process then took place over and over to build a body containing billions of cells?

2007-02-21 11:35:52 · 5 answers · asked by Anonymous

2007-02-21 11:34:41 · 11 answers · asked by bio student 1

Biology homework question. thanks for the help

2007-02-21 11:32:50 · 3 answers · asked by Anonymous

i am thinking bout doing it beause i need another kidney but i dont know......

2007-02-21 10:18:39 · 5 answers · asked by wakeupcall 3

Do you support human or theraputic cloning? Why or why not?

I support theraputic cloning. Human is a bit much.

2007-02-21 10:13:52 · 6 answers · asked by gorgeous_kati 1

ive even tried to hold them open by my eyelashes when i can feel one coming on but it doesnt work..?

2007-02-21 10:02:35 · 17 answers · asked by Anonymous

A woman with AB blod had a baby with B blood. what is the blood type (not the genotype) of the father?
a) AB only
b) O or A or B
c) B only
d) A or B or AB or O
e) O or B

2007-02-21 09:56:33 · 3 answers · asked by yahoo addict 1

Question #2: Why is evolution considered the "unifying theory of biology"?
If you answer these questions by the end of today, that would be great!! =) tay

2007-02-21 09:47:17 · 5 answers · asked by Anonymous

okay here is the problem...in tomatoes, red fruit color R is dominant to yellow fruit color r. a fatmer signed a contract with a large seed company to provide pure red RR and pure yellow rr. the seed complany doesnt want any
heterozygous Rr seeds. howw could the farmer tell if his red tomatoes are pure or heterozygous? thankss

2007-02-21 09:42:13 · 4 answers · asked by qwerty_123 2

How could I answer the question: "If apes evolved into humans, why are there still apes?" In the evolutionary trend, most older "versions" went extinct, like neanderthals being displaced by modern man, so why aren't the apes we supposedly evolved from gone?

2007-02-21 09:33:58 · 9 answers · asked by omnislash7377 2

2007-02-21 09:16:28 · 1 answers · asked by vanessa g 1

Hey guys,I would love if you could give me some ideas for how to make a DNA model.It could be 3-d or 2-d.I wanted to do something unique other than toothpicks and marshmellows.It could be made out of ANY materials and should look like the real thing.I really need an A on this project,so try to help me out.
Thanks in advance

2007-02-21 09:10:04 · 6 answers · asked by queend4ever 2

Why?

2007-02-21 08:46:09 · 13 answers · asked by Anonymous

i have to make a model of both for biology class and tell the difference between them

2007-02-21 08:38:54 · 12 answers · asked by babykhi16 2