Bobby

hcbiochem

回覆: 9

2021-04-05 11:59 pm

Options other than Yahoo Answers?

[匿名]

回覆: 2

2021-01-20 12:41 pm

Which one of the following is equal to the pKa of a weak acid?

[匿名]

回覆: 1

2020-12-16 1:33 pm

Stumped on Chemistry question. 300 mLs of a 2% NaOH (sodium hydroxide, a base) ...?

[匿名]

回覆: 2

2020-12-14 10:21 am

Consider a titration involving a weak acid, HA (Ka = 7.89x10-6). A standardized solution NaOH(aq) with a concentration of 0.341M is used as?

[匿名]

回覆: 2

2020-12-12 10:16 am

CHEMISTRY HELP?

[匿名]

回覆: 3

2020-10-06 5:07 pm

aCO3 + 2HCl --> CaCl2 + CO2 + H2O?

[匿名]

回覆: 2

2020-09-23 4:45 pm

Science or chemistry, unsure ?

[匿名]

回覆: 2

2020-09-22 2:37 pm

Complete the following equation showing the main organic products...?

[匿名]

回覆: 2

2020-09-22 1:07 pm

The reactant concentration in a first-order reaction was 7.10×10−2 M after 30.0 s and 6.00×10−3 M after 60.0 s . ?

[匿名]

回覆: 2

2020-09-21 5:59 pm

dehydration of 1-butanol?

[匿名]

回覆: 2

2020-09-21 4:29 pm

Empirical & Molecular Formula?

[匿名]

回覆: 2

2020-09-19 1:48 pm

Ascorbic acid ( H2C6H6O2 ) has 𝐾a1=8.00×10−5 and 𝐾a2=1.60×10−12 . What's the pH of a 0.281 M ascorbic acid ( H2C6H6O2 ) solution?

[匿名]

回覆: 3

2020-09-15 2:23 pm

10th Grade Chemistry Help?

charles

回覆: 2

2020-09-14 4:49 pm

Please help urgent chemistry homework I need the work ?

[匿名]

回覆: 5

2020-09-10 10:49 pm

Empirical formula question?

[匿名]

回覆: 3

2020-09-09 12:00 pm

What is the maximum mass of chromium, Cr, that can be extracted from 76g of chromium (III) oxide?

[匿名]

回覆: 4

2020-09-08 4:57 pm

How to find the molarity of balanced equation ?

[匿名]

回覆: 1

2020-08-30 3:54 am

Need help with chemistry problem?

[匿名]

回覆: 1

2020-08-30 2:52 am

Chemistry help?

[匿名]

回覆: 3

2020-08-26 5:16 pm

Compute for pH of pyridinium chloride.?

FRED

回覆: 2

2020-08-24 4:46 pm

Calculate the pH of 1.0M solution of methylamine (𝐶𝐻3𝑁𝐻2 , 𝐾𝑏 = 4.38 × 10−4)?

[匿名]

回覆: 3

2020-08-06 7:25 am

Measured at 650C and 500 torr, the mass of 3.21 L of a gas is 3.5 g. The molecular weight (molar mass) of the gas is?

[匿名]

回覆: 2

2020-08-03 11:45 pm

What's the pH of a 0.1 M HIO solution knowing that its pKa = 10.4?

[匿名]

回覆: 2

2020-07-22 4:02 pm

Calculate the solubility of magnesium fluoride, MgF2, in water by knowing the Ksp = 5.2 x 10-11?

[匿名]

回覆: 4

2020-07-21 10:42 am

A certain reaction has an activation energy of 60.0 kJ/mol and a frequency factor ?

[匿名]

回覆: 2

2020-07-16 3:24 pm

chemistry question please answer asap?

[匿名]

回覆: 2

2020-07-06 3:58 pm

Chemistry Help? Balance the following equation representing a reaction that occurs in an acidic solution...?

[匿名]

回覆: 1

2019-09-29 5:42 pm

What is the literature value for heat of solution of benzoic acid?

[匿名]

回覆: 2

2018-04-13 11:49 am

When 0.280 g of Na(s) reacts with excess F2(g) to form NaF(s), 6.90 kJ of heat is released to surroundings at standard-state conditions.?

[匿名]

回覆: 2

2018-04-11 1:29 pm

What is the intermediate? Please help :)?

[匿名]

回覆: 2

2018-04-10 11:37 pm

mol of nitrogen in 0.40 mol of caffeine.?

[匿名]

回覆: 2

2018-03-23 9:13 am

What s the molar mass of H2O?

[匿名]

回覆: 2

2018-03-07 10:13 am

The equilibrium constant, Kc, for the following reaction is 77.5 at 600 K. CO(g) + Cl2(g) COCl2(g)?

[匿名]

回覆: 2

2018-02-18 10:46 am

At high temperature, 2.00 mol of HBr was placed in a 4.00 L container where it decomposed in the reaction:?

[匿名]

回覆: 3

2017-08-18 1:49 pm

name this compound using IUPAC system?

[匿名]

回覆: 2

2016-10-10 3:14 pm

How much quantity of helium gas in 50 liters container at 27 degree celsius at 140 bar pressure?

[匿名]

回覆: 5

2016-07-17 10:48 am

what is the polarity of the bond : CO2?

[匿名]

回覆: 3

2016-06-21 12:14 pm

chemistry rate law problem?

[匿名]

回覆: 2

2016-06-18 8:45 pm

The complex Sc(H2O)62+ absorbs light at 520. nm. Calculate ∆ for this complex to three significant figures?

[匿名]

回覆: 2

2016-06-15 1:03 am

pH problem?

[匿名]

回覆: 2

2016-06-12 5:59 am

HOW DO YOU DO THIS QUESTION - Urgent Empirical/Molecular Formula Question Chemistry?

[匿名]

回覆: 3

2016-05-31 7:45 am

Which solution has the higher boiling point, 0.500 M glucose or 0.300 M KCl?

[匿名]

回覆: 1

2016-05-12 3:01 am

chem hw help please!?

[匿名]

回覆: 2

2016-04-17 4:21 am

what is the mass of magnesium which completely reacts with 250cm^3 of 1 mol/dm^3 sulfuric acid?

[匿名]

回覆: 2

2016-01-27 2:43 am

Year 11 Chemistry Help!?

[匿名]

回覆: 3

2015-12-23 1:15 pm

how do you balance these equations? a) Ca3(PO4)2 + SiO2 + C → CaSiO3 + P + CO b) N2H2 + NO2 → N2 + H2O please help!!!!?

[匿名]

回覆: 1

2015-06-26 4:02 pm

If 35.80kg of CaCO3 contain 4.296kg C, 14.33kb Ca, and 17.17kg O, what is the percent composition of CaCO3?

[匿名]

回覆: 1

2015-05-27 6:07 am

Chemistry help on calculations!?

[匿名]

回覆: 1

2015-05-04 5:10 am

A phosphorus oxide has an empirical formula of PxOy and 56.36% phosphorus by mass . What is the values of x anf y?

[匿名]

回覆: 1

2015-04-18 11:16 pm

Ethane gas reacts with 670 grams of oxygen gas forming carbon dioxide gas and liquid water. How many grams of water are produced?