不用客氣

[匿名]

回覆: 3

2020-11-17 11:44 am

How long until the radioactive isotope decays to 1.3×10−2 mg ? ?

[匿名]

回覆: 1

2020-10-07 9:01 pm

Find the moment at point B?

[匿名]

回覆: 1

2020-10-07 9:01 pm

Find the moment at point B?

[匿名]

回覆: 1

2020-10-07 9:11 pm

Find the moment at point B?

[匿名]

回覆: 1

2020-10-07 5:20 pm

. What volume of 0.250 M nitric acid is needed to neutralize 17.35 mL of 0.195 M KOH solution?

[匿名]

回覆: 2

2020-09-29 10:38 pm

Choose the property that justifies the following statement. If AB = CD, then CD = AB.?

[匿名]

回覆: 1

2020-09-29 9:33 pm

This stoichiometry question in confusing somebody explain to me please. Question in below.?

[匿名]

回覆: 2

2020-09-29 7:34 pm

Math help. Please solve :)?

[匿名]

回覆: 1

2020-09-29 3:06 pm

Question pertaining to alkaline hydrolysis of ester.?

[匿名]

回覆: 1

2020-09-23 1:50 pm

Yellow light has a frequency of 5.45 x 10^14 Hz. Calculate the energy of this light.?

[匿名]

回覆: 6

2020-09-23 1:38 pm

need help with steps in solving, x+14=9+6x?

[匿名]

回覆: 2

2020-09-23 11:17 am

CHEM HELP PLEASE?

[匿名]

回覆: 2

2020-09-19 1:10 pm

What volume of a 772 mM stock solution is necessary to make a 100. mL of 25 mM?

[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: 1

2020-09-16 11:10 pm

HELP!!!!! ?

[匿名]

回覆: 1

2020-09-11 9:29 pm

If you have 15.0 L of a gas at 100 0C and 203 kPa, how many moles of the gas do you have? *Recall Gas Constant R?

[匿名]

回覆: 2

2020-09-11 5:48 pm

Can you Explain this question?

[匿名]

回覆: 1

2020-09-11 2:27 pm

How many molecules of CCl4 are present in 6.10 × 10−3 g of CCl4?

[匿名]

回覆: 2

2020-09-11 4:38 pm

An unknown substance contains 71 percent carbon and 16 percent ...?

[匿名]

回覆: 4

2020-09-08 4:57 pm

How to find the molarity of balanced equation ?

[匿名]

回覆: 1

2020-09-08 1:16 pm

A pill that is 91.5% aspirin is found to contain 57.53 mg of aspirin. What is the mass of the pill in milligrams?

[匿名]

回覆: 1

2020-09-08 1:19 pm

hard chemistry problem?

[匿名]

回覆: 1

2020-09-08 1:24 pm

chemistry trouble?

[匿名]

回覆: 4

2020-09-04 12:46 pm

The length of a rectangle is 2 more than 2 times the width. The perimeter is 34 units, what is the area?

[匿名]

回覆: 1

2020-08-30 11:01 pm

Time, Velocity, Speed?

[匿名]

回覆: 3

2020-08-30 11:03 pm

Physics Acceleration?

[匿名]

回覆: 2

2020-08-30 8:06 am

How many grams of beryllium are needed to produce 11.5 g of hydrogen gas? Be(s) + 2H2O(l) → Be(OH)2(aq) + H2(g)?

[匿名]

回覆: 17

2020-08-29 9:47 pm

Solving equations when there are variables in the denominator?

[匿名]

回覆: 2

2020-07-20 12:17 pm

Please help and show work, keep getting wrong.?

[匿名]

回覆: 1

2020-05-31 3:51 pm

How many optical isomers does this molecule have?

[匿名]

回覆: 1

2020-05-31 4:17 pm

Please help with this question about oxidation of alcohols and flavon-3-ol?

[匿名]

回覆: 4

2020-05-31 3:27 pm

If cos y + 3 = xy3 - 4x then find dydx?

[匿名]

回覆: 1

2020-05-31 1:32 pm

What is the power plant's thermal efficiency?

[匿名]

回覆: 2

2020-05-15 1:41 pm

How I do this? chem help?

[匿名]

回覆: 3

2020-05-14 1:20 am

Triangle word problem help?

[匿名]

回覆: 2

2020-05-14 12:52 am

what is IUPAC name of ch3ch2CHCHCH(CH3)2 ?

[匿名]

回覆: 1

2020-05-02 12:24 am

Find rate of reaction?

[匿名]

回覆: 1

2020-05-01 11:29 pm

Acid base question?

[匿名]

回覆: 1

2020-05-01 10:59 pm

Organic Chemistry Help?

[匿名]

回覆: 3

2020-04-20 12:19 pm

Calculus 12 question?

[匿名]

回覆: 3

2020-04-20 11:17 am

Chemistry Problem Help ASAP!?

[匿名]

回覆: 1

2020-04-20 11:04 am

Chem 2 Help. AWARD For Best Answer?

[匿名]

回覆: 1

2020-04-14 12:21 am

equation:aqueous sodium hydroxide reacts with aqueous magnesium sulfate to make the precipitate magnesium hydroxide and aqueoussodiumsulfate?

[匿名]

回覆: 1

2020-04-13 11:32 pm

To what temperature must a sample of helium gas be cooled from 140◦C to reduce its volume from 5 L to 0.19 L atconstantpressure?anser in K?

[匿名]

回覆: 1

2020-04-13 9:55 pm

Suppose you dissolve 2 g of KH2PO4 in 1L of water and then adjust the pH of the solution to 6.8?

[匿名]

回覆: 1

2020-04-08 11:53 am

An acid–base titration was performed to determine the Ksp of a slightly soluble salt. The Ksp was experimentally determined at 80.0 C, and ?

[匿名]

回覆: 4

2020-04-08 1:49 am

add or subtract the rational expressions (must show work)?

[匿名]

回覆: 2

2020-04-08 1:02 am

Using C3H8 + 5O2 → 3CO2 + 4H2O How many grams of C3H8 need to be reacted to produce 1.8 L of CO2 at STP?

[匿名]

回覆: 1

2020-04-07 11:50 pm

How can I solve this equation, 2sin^2 x+1=3sinx find all values in 0,360?

[匿名]

回覆: 1

2020-04-05 9:22 pm

PLEASE HELP! What is the Ksp expression for Ni(OH)2?