戇戇居士

Your answer should have the same number of significant figures as the starting measurement.  3201 mL = cm³?

chemistry help!?

Calculate the heat of reaction for the burning process?

The rate constant for a reaction at 230 ⁰C is found to be exactly twice the value at 220 ⁰C. Calculate the activation energy.?

angle/depth question ?

When a group 1 element reacts it?

Not sure how to do this. ?

Chemistry -- Gas Pressure Question?

How many moles are in 1.50 g of ethylamine, CH3CH2NH2? ?

Order these numbers from least to greatest?

Science or chemistry, unsure ?

Chemistry question?

Logarithm Question can someone help me?

What is the proof that the graphite and diamond are different forms of element carbon?

potassium carbide formula?

A sample of mercury with a mass of 114.0g was combined with 17.9g of oxygen gas, and the resulting reaction gave 123.1g of mercury(II)oxide.?

What is the atomic mass of silver?

Which compound will have the larger magnitude enthalpy of hydration?

Find the gradient of the curve y=e^-3x at the point where it crosses the y-axis.?

The density of alcohol is 0.91 g/mL. What volume would 312 g of alcohol occupy?

高二三角函數的的一些題目不會寫?

Let the universal set : U = { 1 , 2 , 3 , . . . , 10 } .Let A = { 1 , 4 , 7 , 10 }, B = { 1 , 2 , 3 , 4 , 5 }, and C = { 2 , 4 , 6 , 8 }. ?

What is the pH of acid rain?

Calculus Cross Product?

if a sphere has a volume of 0.0057 m what is its volume in ml?

How much power exists when a power line is carrying a current of 0.50 amp that is being impressed by a voltage of 150,000 volts?

Help With Titration Calculation?

The standard-state reduction potential?

Kc and Kp expressions?

Help with Chem ASAP Please Explain?

CHEM HELP ASAP PLEASE EXPLAIN?

CHEM HELP ASAP PLEASE EXPLAIN?

Heat and Energy ?

Physics, Efficiency. ?

boyles law question ?

If the pH = 5.47, calculate the hydronium ion concentration ?

Diazoniom ion help please?

is the answer vector AB? or is it -AB?

What of the following are appropriate resonance forms of the anion shown below. Chose all that apply ?

how many mL of ethanol would be required in 225 mL of water to make a 38% ethanol by volume solution?

titrating buffers ?

I have a chemistry question on ground state electron configurations?

Need help on probability question?

3. Which solution would have the lowest [OH-]?And why? a. pure water  b. 0.50 M NH3  c. 0.50 M HCl  d. 0.10 M NaOH  e. 0.10 M NaCl ?

chem help?

Chemistry ?? (Synthesis)?

pH Chemistry?

Need help with Chemistry Pls?

What is the temperature of 0.62 mol of gas at a pressure of 1.5 atm and a volume of 11.7 L ?

The density of a gas is 1.48 g/L at a temperature of 24 ∘C and a pressure of 0.784 atm . Calculate the molar mass of the gas.?