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BIOLOGY/CHEMISTY

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Chemisty 11
Why is it important to use the correct salt-sand mix on highways during storms? Help please this is for my Chemisty Project

math,physics,chemisty,biology
the number of moles of H2O2 required to completely react with 400ml of 0.5N KMnO4 in acidic medium are

Chem
why is an understanding of chemistry important in biology? All digestion, nutrition, muscle usage/reactions, cell division/reproduction, and all of the enzymatic processes at work in the body are chemisty. Even eyesight is a chemical reaction. So you need to know something ...

BIOLOGY/CHEMISTY
a student uses the unduiluted glucose stock solution in a reaction and finds that the absorbance values over 90 seceonds are all 1.900. What does this result tell you abou the enzyme activity of glucose oxidase in this reaction after the 90 seconds time point? Would it be ...

English
1. He is absorbed in biology. 2. He is very interested in biology. 3. He is into biology. ----------------- Are they all the same in meaning?

AP BIOLOGY
I have a quiz on genetics on friday in AP Biology and I would like some sites with good ap biology questions on them. I don't know any of them which I could go to.

Biology
Is 9th grade biology hard? Is it interesting...?? I love life science but I just wondering if 9th grade biology hard??? I'm taking biology next year.

Biology
The allostery of an enzyme governor is likely to take two forms.They are? A.active and regulatory B. rigid and flexible c. active and passive e. regulatory and relaxed http://en.allexperts.com/q/Biology-664/biology-73.htm

chemisty
Na+I_2

ART Check
How would a visual effects designer working on an animated movie with human characters best use knowledge of biology? Knowledge of biology can help the designer to create accurate human features.**** Knowledge of biology can help the designer to create an action packed film ...

Enriched science
What is the goal of synthetic biology? A. The goal of synthetic biology is to mimic living cells B. The goal of Synthetic biology is to generate new tissues to replace damage tissues C. The goal of synthetic biology is to engineer living cells to perform specific functions D. ...

Chemisty
explain how you get a decompositin..?

chemisty
balancing equations H2+02=

Chemisty
Need Boys #'s

Chemisty
why do you use water in calorimeters?

chemisty
how many grams are in 5.66 mole of of CaCo3

chemisty
(NH4)2SO4 How many atoms

chemisty
what is the name of this substance K2Cro4

Chemisty
How many V atoms are there in a 26.3 gram sample of V?

Chemisty
Full analysis for calcium

chemisty
calculate the H+ for green tea with a pH of 7.9

Chemisty
How do i convert 0.0024 to scientific notation

chemisty
does NF3 follow the octet rule

Chemisty
What is the electron dot structure of Ethanol?

clinical chemisty
why is lupus inhibitors important

CHEMISTY
why is but-1-ene a structural isomer of 2-methylpropene?

chemisty
give the conjugate base for HNO2

Chemisty
How do you convert 237.7 g/mol to moles?

chemisty
how do you convert 50 microliters of 2 butanol to moles?

Chemisty
If 59.0 mL of 0.40 M HI is mixed with 100. mL of 0.10 M KOH what is the resulting pH?

chemisty
How many moles of Ba(OH)2 are present in 295mL of 0.800M Ba(OH)2?

chemisty
convert 32.9g of neon into moles

chemisty
how many grams of KCL are there in 1200 ml of a 2% KCI solution

Chemisty
The molecular structure around the oxygen in water is....????

Chemisty
A 5M solution is diluted 1/10 and again 1/5. What is the concentration of each dilution?

Chemisty
What mass of aluminum is produced by the decompisition of 7.47 kg of Al2O3?

chemisty
What is the approximate mass of 2L of C4H10 gas at STP?

CHEMISTY
WHICH HAS THE HIGHER BOILING POINT PENTANE OR HEPTANE

Chemisty
What volume of 0.57 M HCl is needed to react with 5.6 g CaCO3?

Chemisty
how many grams of propane would be burned with 80.0g of oxygen?

Chemisty
What mass of an NO2 is formed when and NO reacts with 384 g of O2?

Chemisty
How many grams of HNO3 will be contained in 300 mL of a 5 N solution?

biology tutor on jiskha
i post my biology questions here today and few days ago no teacher reply. there not any biology tutor on here?

Chemisty
What are the factors that cause the difference between measured pH and calculated pH in titration.

chemisty
How many moles of molecules are there in 250 grams of hydrogen nitrate?

chemisty
How much energy is needed to melt a 30.5 g ice cube?

Chemisty
In which cases are higher-energy photons released, with Li+ or Cu2+? How do you know?

Chemisty
calculate pH of 50.0 mL of a .100 M solution of the weak monoprotic acid HX

Chemisty (Sig Figs)
79.7 + 890.43 - 23 = 9.5 e2 its wrong and I am suppose to correct it.

chemisty
balance ___ch3ch2cooh + __o2 yields __co2 + ___h2o

Science (Chemisty)
Why do you never find liquid bromine in your neighborhood?

Chemisty
How would you classify a solution of NaCl at 35.9 g/100 g of water at 20° C?

any tutor
Are there any tutors on right now or people who are good with chemisty?

Chemisty
How many grams of c6h12o6 are needed to form 7.50g of c2h5oh

Chemisty
how many mole of calcium sulfate are in a 100mL of .86M solution?

organic chemisty
write raction of benzoic acid with propylamine

Chemisty
When alkali metals are heated with hydrogen they form--------hydrides

Organic chemisty
What's the difference between a major and minor product?

Chemisty
How many litres of water at 100°C are vaporized by the addition of 5.00 MJ of heat

chemisty
convert .98L of N20 gas at STP to moles

chemisty
how we prepare 0.5 mol of solution of hcl in 70ml in water

chemisty
What would happen if you reacted potassium dicarbonate with HCL and NaOH?

Chemisty 11 U
Determin the number of oxygen atmos in 1.75kg of potassium sulfate.

Chemisty 11 U
Determin the number of oxygen atmos in 1.75kg of potassium sulfate.

Chemisty 11 U
Determin the number of oxygen atmos in 1.75kg of potassium sulfate.

chemisty
What mass of iodine contains the same number of atoms at 25.0 g of chlorine?

Chemisty
Describe how you would prepare 250 ml of a 0.10M NaCl solution?

chemisty
how many grams of magnesium sulfate are required to make 575 ml of a 1.65% (m/v) solution

Chemisty
what instrument would you use to determine the mass of three apples

Chemisty
What instrument would you use to determine the volume of orange juice

analytical chemisty
Calculate the pH and pOH of a 0.00002M solution of acetic acid.

chemisty 2
Calculate the molarity (M) of a solution if you have 0.34 mol of NaOH in 19 ml of water

Analytical chemisty
How many grams of K2Cr2O7 are required to prepare 500 ml of a 0.13 N solution?

science
when a substance is heated energy is released/ absored. in chemisty this is called an

Chemisty
250g of water containing sucrose freezes at -3.5C. What is the molality of the solution?

chemisty
what volume will be occupied by 3.25mol of oxygen gas at 735mmhg and 25celcius?

Chemisty
blanced equation for MgSO4(aq) + BaCl2(aq) describing any precipitaion reaction

Chemisty
the Keq of Mg(OH)2 is 2(10^-11). calculate the concentration of Mg ions in a saturated solution of this compound

chemisty
How many mL of .200 M NaOH are required to completely neutralize 5.00 mL of 0.100 M H2PO4?

chemisty
Calculate the density of oxygen,O2 , under each of the following conditions: 1- STP 2- 1.00 atm and 35.0 C

chemisty
what type of reaction occurs when potassium metal reacts with fluorine gas?

chemisty
how many grams of Na are needed to react with H2O to liberate 400mL of H2 gas at STP?

chemisty
calculate the molarity of a solution with .2 moles of sodim hydroxide dissolved in .5L of water

Chemisty
How many milliliters of 5.50 M HCl must be diluted to make 350. mL of a 0.500 M solution?

chemisty
What is the density of a 17.12 g object if the dimensions of the block are: length = 12.6 mm height = 9.82 cm width = 0.0140 m

chemisty
Calculate the volume of 4.0ml of nitogen gas at 754mmhg and 25 degrees celcius

Chemisty
What mass of carbon dioxide is formed by the complete combustion of 885g of methanol?

Chemisty
calculate the concentration of the solution of 6.4g calcium sulafte is added to 0.125l of water

Chemisty
Balance TeO3^3- + N2O4 --> Te +NO3^- using oxidation numbers Need help A.S.A.P

chemisty
If 26.5 mL of 0.222 M HCl reacts with excess Mg, how many mL of hydrogen gas are produced at STP?

Chemisty
8g of hydrogen is burnt in the presence of excess oxygen.the mass of water formed is?

Chemisty
What is the molecularity of each of the following elementary reactions? A. O+O2+N2----> O3+N2+ B. NO2Cl + Cl---> NO2 + Cl2 C. Cl + H2 ---> HCl + H D. CS2----> CS + S

chemisty
A bottle labeled 0.150Msulfuric acid contains a solution with what concentration in sulfate ions?

Chemisty
What is the Net Ionic Equation for the following: a.) NH4Br, NaOH b.) Li2CO3, HClO4 c.)Pb(NO3)2, Kl

Chemisty
In terms of saturation, how would you classify a KBr solution with a concentration of 78 g/100 g of water at 47°C?

Chemisty
In terms of saturation, how would you classify a KBr solution with a concentration of 78 g/100 g of water at 47°C?

Chemisty
How much KNO3 will you have to add to 100 g of water at 40° C to make a saturated solution?

Chemisty
How many moles of H2PO4 and HPO4 would be needed to prepare 1.0 L of a 0.01M phosphate buffer with a pH of 6.82?

Chemisty
Will Cd(OH)2 precipitate if 10.00 g of Cd(NO3)2(s) (MM = 236.42 g/mol) is added to 0.500 L of a 0.800 M NH3 solution?

Chemisty
2C2H6(g) + 7O2(g) = 4CO2(g) + 6H2O(g) How many L of oxygen gas is needed to produce 18.0 L of CO2

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