09/28/17

the fuel tank of a truck has a capacity of 55 gal. if the tank is full of gasoline (sg=0.751)
sg=0.751   find mass and weight of the gasoline in SI units
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09/28/17

Chemistry Help ?
 Calculate the average atomic mass for imaginary element “W” given the following information. There are 2 isotopes of this element, having atomic masses of 76.14 amu and 78.52 amu. The abundance of... more
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09/28/17

Ionic compound. How does monatomic work? For instance iron can make Fe2+ and Fe3+ how and why? Please help
Ionic compound/bond. How does monatomic work? For instance iron can make Fe2+ and Fe3+ how and why? Please help   Where does the 2 and 3 come from in Fe2/3+? Ive heard it is to balance the... more
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09/28/17

CHEMICAL KINATICS
when sulphur (in terms of S8)is heated at temp t ,at equlibrium the pressure of S8 falls by 30% from 1 atm, because s8 is partillay converted into s2 finf kp for this reactoin options A 2.96 B 6.14... more
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09/28/17

How do I solve this?
How do I solve this? Briana and her sister Molly both want to buy the same model bike. Briana needs $73 more before she can afford it. Molly needs $63 more. If they combine their money they will... more
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09/28/17

Important Gold Bracelet Problem
How could you use density to show that a gold bracelet contains elements other than gold? (CREATE AN EXPERIMENT FOR THIS PROBLEM)
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09/28/17

ammonium hydrogen sulphide is contained in a closed vessel at 313K when total pressure at equilibrium is found to be 0.8 atm. the value of kp for the reaction N
ammonium hydrogen sulphide is contained in a closed vessel at 313K when total pressure at equilibrium is found to be 0.8 atm. the value of kp for the reaction NH4HS--->NH3+H2S
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09/27/17

Chemistry Molarity
A 3.366 g sample of an unknown hydrate of cobalt(II) bromide is heated until all the water of hydration is removed. The CoBr2 that remains has a mass of 2.319 g. (a) How many moles of CoBr2 are in... more
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09/27/17

an atoms valence electrons are those electrons that have the highest energy
this is a science question for the 7th grade . I don't know the answer to this.  
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09/27/17

Gradients and ion channels
Ions diffuse across membranes through specific ion channels down.. Please explain answer as to why that is the answer
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09/27/17

types of bonds
Why does water have a high specific heat? Please explain the answer.
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09/27/17

Periodic trends
Explain the periodic trends for atomic radius, ionization energy, and electronegativity, and give an element whose ionization energy does not follow the trend and explain.
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09/27/17

Tigers are good hunters. A tiger is successful once every 10 tries. How many times will the tiger be successful in 40 tries?
Word problem write a number sentence and solve
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09/27/17

Convert 8.2 miles to meters
1 km = 0.6 miles
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09/26/17

Mr.Coles madde 300 cookies. He wanted to make packages that would each contain 25 cookies. find how many packages he could make.
i need help with these word porblems 
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09/26/17

Recrystallization problem! ORGANIC CHEMISTRY
200 mg of impure sucrose was weighed out. After recrystallization from water, 225 mg of solid compound was obtained. What happened? How can this be corrected?
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09/26/17

Certain clouds form when temperatures fall below 73°c What is this temperature in degrees Fahrenheit?
Certain clouds form when temperatures fall below 73°c What is this temperature in degrees Fahrenheit?
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09/26/17

Regarding enzyme kinetics
The KI of a competitive inhibitor is 600 nM. If the KM of the un-inhibited enzyme is 80 nM,  a. What is the KM when 400 nM of inhibitor is present?b. What concentration of inhibitor is needed to... more
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09/26/17

Regarding enzyme kinetics
You are deciding which of two enzymes to buy for your Biotech company. Evaluated on the same substrate Enzyme A has a kcat of 950 s-1 and a KM of 200 μM, whereas Enzyme B has a kcat of 2500 s-1 and... more
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09/26/17

Regarding enzyme kinetics
Expressed as a multiple of its KM, how much substrate is required in order for an enzyme to be 50 % saturated? (i.e. what is [S]/KM?). And 98 % saturated?
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09/26/17

Regarding enzyme kinetics
According to the Michaelis Menten equation, at what percentage of its maximum rate is an enzyme operating when [S] = ½ KM?
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09/26/17

Regarding enzyme kinetics
 1. The KM of an enzyme/substrate combination is 125 mM, with a VMAX of 20 μM.s-1.  The concentration of enzyme is 45 nM. a. At what rate is product being formed when the concentration of substrate... more
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09/25/17

Concentration of Stock
the concentration of stock solution X is 3.6 x 10^-3 M. The concentration of stock solution Y is .15M. If 4.0 mL of X is mixed with 6.0 mL of Y , what is the new concentrations of X and Y?
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09/25/17

Would there be enough information to answer this question?
My teacher is saying to use Hess' law of formation for this question but i still dont see how it will work, if anyone knows how to do this question could you please show me how to do it:    A... more
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09/25/17

Chemistry Problem
Hydrogen and chlorine each have two naturally occurring isotopes: 1H (1.0078 amu; 99.985% abundance) and 2H (2.01410 amu; 0.015% abundance); 35Cl (34.969 amu; 75.53% abundance) and 37Cl (36.966... more
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