wanszeto

[匿名]

回覆: 2

2017-01-11 9:47 am

Scientific notations?

[匿名]

回覆: 2

2017-01-11 9:36 am

Write in scientific notation: 255,000?

[匿名]

回覆: 2

2017-01-10 5:09 pm

Melting points of Alkali Metals and Halogens?

[匿名]

回覆: 2

2017-01-10 5:12 pm

a 147-g piece of metal has a density of 7.00 g/ml. a 50-ml graduated cylinder contains 20.0 mL of water.?

[匿名]

回覆: 1

2017-01-09 11:56 pm

Equilibrium constant of this reaction?

[匿名]

回覆: 3

2017-01-04 5:33 pm

What is MS.c?

[匿名]

回覆: 4

2017-01-03 12:16 am

Simple organic chemistry question?

[匿名]

回覆: 1

2016-12-30 10:49 pm

Calculate the heat of combustion of one mole of C4H8 if the equation describing the process is C4H8(g) + 6 O2(g) 4 CO2(g) + 4 H2O(l)?

[匿名]

回覆: 3

2016-12-16 5:40 pm

A sample of an ideal gas has a volume of 3.30 L at 13.20 °C and 1.70 atm. What is the volume of the gas at 19.40 °C and 0.989 atm?

[匿名]

回覆: 1

2016-12-13 9:31 pm

If we keep liquid nitrozen in an insulator in space,what will happen?will it stay in liquid state or it will be frozen??

[匿名]

回覆: 1

2016-12-13 5:20 pm

Silicon (IV) oxide has a high melting point whereas carbon dioxide is a gas. Explain this in terms of the structures and bonding of the two?

[匿名]

回覆: 2

2016-12-13 2:28 pm

What volume of 0.078 M HNO3 is required to reach the end point when titrating 12.0 mL of 0.16 M Ba(OH)2 of this solution?

[匿名]

回覆: 2

2016-12-13 12:21 pm

How many grams of barium sulfate are produced if 25.00mL of 0.225 M BaCl2 completely react given the reaction:?

[匿名]

回覆: 1

2016-12-13 9:17 am

How many moles of methane are there in 1.2 * 1024 molecules of methane?

[匿名]

回覆: 1

2016-12-07 5:08 pm

if the concentration of a reactant is doubled, rate of reaction increased 8 folds.The reaction order with respect to this reactant is ? 3 ?

[匿名]

回覆: 2

2016-12-06 3:45 pm

Molecular complete and net ionic equations?

[匿名]

回覆: 1

2016-11-26 10:08 am

How many grams of iron can be produced (plated out) by applying a 3.65 amp current for 87.0 minutes to a solution containing Fe3+ ions?

[匿名]

回覆: 1

2016-11-23 2:38 am

How many milliliters of 0.300M HCl can react with 2.31g Zn? Zn(s)+2HCL(aq)H2(aq)+ZnCl2(aq)?

[匿名]

回覆: 1

2016-11-22 5:25 am

help with chemistry?

[匿名]

回覆: 1

2016-11-21 8:34 am

Chemistry Help!!?

[匿名]

回覆: 1

2016-11-17 6:40 am

Solubility chemistry question?

[匿名]

回覆: 1

2016-11-13 3:20 pm

What is the concentration of a solution formed by diluting 250 mL of 6.0 M NaOH to 0.45 L?

[匿名]

回覆: 2

2016-11-09 1:39 am

Calculate the concentrations of all species in a 1.65 M Na2SO3 (sodium sulfite) solution?

[匿名]

回覆: 1

2016-11-04 4:36 pm

Calculate the [OH-] of a 0.10M NH4OH that has a Kb of 1.8x10^-5?

[匿名]

回覆: 1

2016-11-04 2:14 am

0.50 mole of NaCl is added to 1.0 kg of water. The freezing point of the solution will be?

[匿名]

回覆: 1

2016-11-02 5:04 pm

CHEMISTRY HELP PLEASE?

[匿名]

回覆: 2

2016-11-02 8:52 am

A solution has a [OH−] of 1 x 10−9. What is the pOH of this solution?

[匿名]

回覆: 1

2016-11-02 5:04 am

Na3PO4(aq)+Cu(NO3)(aq) double displacement reaction and total ionic reaction and net ionic reaction?

[匿名]

回覆: 1

2016-11-02 4:50 am

PreAP Chemistry. How many oxygens atoms are in 4 molecules of dinitriogen dioxide (N2O2)?

[匿名]

回覆: 1

2016-11-02 3:47 am

Help with Chem question?

[匿名]

回覆: 1

2016-11-01 2:56 pm

What is the water solubility of PbI2 (Ksp = 8.4 × 10-9, MM = 461 g/mol) in moles per liter?

[匿名]

回覆: 3

2016-10-26 4:47 pm

can someone help me with this? calculate the relative molecular mass of a gas if a 500cm3 sample at 20c and 1atm has a mass of 0.66g?

[匿名]

回覆: 2

2016-10-26 7:15 am

How can I use the ideal gas law to derive the combined gas law?

[匿名]

回覆: 1

2016-10-24 5:54 pm

Given 2 SO2(g) + O2(g) → 2 SO3(g) + 190. kJ If 12.7 kJ of energy are produced by the above reaction, the mass of SO2(g) used is?

[匿名]

回覆: 3

2016-10-24 7:11 am

Why is the answer D?

[匿名]

回覆: 2

2016-10-24 8:16 am

Balancing equation and finding concentration Help. Sapling?

[匿名]

回覆: 1

2016-10-24 7:11 am

78.0 mL of a 1.20 M solution is diluted to a total volume of 208 mL. What is the final concentration?

[匿名]

回覆: 1

2016-10-23 2:54 pm

From the following data calculate delta h for the reaction?

[匿名]

回覆: 2

2016-10-21 12:14 am

2HNO3 (aq) + Ba (OH)2 (aq)--> 2H2O (L) + Ba(NO3)2 (aq) A 0.110-L sample of unknown HNO3 solution required 37.7mL of 0.200M Ba(OH)2 for?

[匿名]

回覆: 1

2016-10-21 1:15 am

Calculate the number of moles of HCl in 25.50 g of 1.0 M HCl solution?

[匿名]

回覆: 1

2016-10-21 6:15 am

4.17g of N, 9.11g of H and 5.05g of He in a flask. The total pressure is 241 kPa. How much pressure of the total does each gas exert?

[匿名]

回覆: 1

2016-10-21 2:19 am

1.54 g of a dorito chip was burned. It heated 150 ml of h20 from 25 degrees Celsius to 28.5 degrees Celsius.?

[匿名]

回覆: 2

2016-10-21 3:45 am

1.54 g of a dorito chip was burned. It heated 150 ml of h20 from 25 degrees Celsius to 28.5 degrees Celsius. Help understanding practice ?'s?

[匿名]

回覆: 1

2016-10-19 3:42 pm

Determine the KJ/mol for dissolving 5.65g of NaOH in 53.0ml of water. Initial temp of water 24C final 49.7C. NaOH is the limiting reagent?

[匿名]

回覆: 1

2016-10-19 7:49 am

What am I doing wrong on my chemistry homework? Please help I have midterm this week!?

[匿名]

回覆: 1

2016-10-18 6:09 pm

Green light has a frequency of about 6.00×1014s−1. What is the energy of a photon of green light?

[匿名]

回覆: 1

2016-10-18 3:32 pm

Calculate the mass of 3 molecule of hydrogen?

[匿名]

回覆: 1

2016-10-16 5:30 pm

標定硫代硫酸鈉標準溶液的濃度，取純 KIO3 0.150g 溶解於蒸餾水，加 KI 溶液，再加稀鹽酸，所析出的 I2 以未知濃度硫代硫酸鈉溶液 20.0ml 滴定即達終點，已知Ｉ=107，K=39。 1.請寫出其反應式 2.計算 Na2S2O3 溶液的莫耳濃度及當量濃度?

[匿名]

回覆: 1

2016-10-18 8:50 am

Chemistry?

[匿名]

回覆: 1

2016-10-18 5:46 am

Calculating the enthalpy of decomposition of phosphorus oxychloride?