戇戇居士

[匿名]

回覆: 4

2017-08-20 11:47 pm

Integral dx/√(9-x²)=?

[匿名]

回覆: 3

2017-08-20 5:22 pm

Measuring Gases help?

[匿名]

回覆: 2

2017-08-20 1:31 pm

Prove that (n-2)(n-1)(2n-3) is divisible by 6 for any positive integer greater than 2. Where did I go wrong?

[匿名]

回覆: 1

2017-08-19 1:49 pm

Math help. Calculus. Question is in the Picture?

[匿名]

回覆: 1

2017-08-18 11:26 am

2.20 g of solid NaOH are added to 250 mL of a 0.10 M FeCl2 solution. Given that Ksp for Fe(OH)2 is 1.6 × 10-14, calculate the following?

[匿名]

回覆: 4

2017-08-16 11:53 pm

Find the length of the line segment joining each pair of points.(Show as exact solution) a) M(3,7) and A(1,3) b) B(5,-1) and C(-3,4)?

[匿名]

回覆: 2

2017-08-16 1:36 pm

what is the maximum mass of CFCl2 that can be made from 10g of hydrogen fluoride?

[匿名]

回覆: 1

2017-08-16 10:34 am

1.) 12a^3 - 9a + 4a -3 2.) 3n^3 - 4n^2 + 9n-12?

[匿名]

回覆: 3

2017-08-16 12:29 am

The element nickel (Ni) has a density of 8.91 g/cm3. How many moles of nickel are there in 5.0 L of nickel. (molar mass 58.69 g/mol)?

[匿名]

回覆: 6

2017-08-15 11:46 pm

what is 15ft by 25ft in squared metres?

[匿名]

回覆: 3

2017-08-11 4:41 pm

Show that the equation tan(30◦ + θ) = 2 tan(60◦ − θ) can be written in the form tan2 θ + (6 √3)tan θ − 5 = 0.?

[匿名]

回覆: 2

2017-08-10 5:54 pm

can velocity change if acceleration is zero? Please explain?

[匿名]

回覆: 6

2017-08-09 4:46 pm

please work out the turning point of the curve and the max and min points of f(x)=x2-3x+2?

[匿名]

回覆: 3

2017-08-09 11:50 am

Please help solve for V1/V2 for 3=20log_10(V2/V1)?

[匿名]

回覆: 1

2017-08-08 12:40 pm

acid and base reactions?

[匿名]

回覆: 4

2017-08-06 8:53 pm

What is the conjugate acid of HF?

[匿名]

回覆: 2

2017-08-04 10:30 pm

why are tertiary alkyl halides practically inert to substitution by SN2 mechanism?

[匿名]

回覆: 5

2017-08-03 11:51 pm

Molecules are closer together in solids than liquids. So why does frozen water expand?

[匿名]

回覆: 4

2017-07-31 3:44 pm

Need to solve 9p-3(8-p) with method if anyone can please!?

[匿名]

回覆: 3

2017-07-28 11:49 pm

Please help me with physics?

[匿名]

回覆: 1

2017-07-26 11:53 pm

Intro to Chem?

[匿名]

回覆: 1

2017-07-25 11:16 pm

Chemistry help please?

[匿名]

回覆: 1

2017-07-25 9:35 pm

CHEMISTRY HELP PLEEEEASE?

[匿名]

回覆: 11

2017-07-25 2:34 pm

plz help me : b - 7b =?

[匿名]

回覆: 4

2017-07-25 12:56 am

The area A of a shape is related to the length x of one side by the quadratic equation:?

[匿名]

回覆: 2

2017-07-20 12:08 am

Please find attached image below thanks in advance?

[匿名]

回覆: 1

2017-07-18 4:04 pm

PLEASE SOMEONE HELP WiTH THIS CHEM QUESTION!!? 10 points?

[匿名]

回覆: 1

2017-07-18 2:20 am

Need help... Thanks!?

[匿名]

回覆: 3

2017-07-15 4:24 pm

A ball is thrown horizontally from top of a sky-rise building 144 ft high with a velocity of 20 ft/sec. Neglecting air resistance, find d?

[匿名]

回覆: 1

2017-07-11 5:22 pm

N2(g) + 3H2(g) → 2NH3(g) ΔH=-46.1 KJ/mole which one is true about the equilibrium(Keq) constant for the given reaction.?

[匿名]

回覆: 2

2017-07-06 11:18 pm

When the following equation is balanced in an acidic solution how many moles of water are present?

[匿名]

回覆: 1

2017-07-04 9:23 pm

Chemistry question need help. Concentration problem. Thank you in advance :)?

[匿名]

回覆: 5

2017-06-29 8:36 pm

WHAT IS THE NAME OF THIS COMPOUND:CH3CH(CH3)CH2CH2OH?

[匿名]

回覆: 3

2017-06-08 11:44 pm

total number of lone pairs in C2H2Cl2O?

[匿名]

回覆: 4

2017-06-08 5:10 pm

Is anyone good at chemistry?

[匿名]

回覆: 3

2017-06-06 11:49 pm

The volume of a rectangular box is 192 cubic centimeters. What is the height of the box if the area of the base is 48 square centimeters?

[匿名]

回覆: 4

2017-06-04 12:42 pm

Math help?

[匿名]

回覆: 2

2017-06-03 12:42 pm

In this question the methyl group CH3 is described as Me.Trimethylamine Me3N reacts with boron triflouride BF3 to form compound of Me3NBF3?

[匿名]

回覆: 4

2017-05-28 12:09 pm

Math question! Let θ be an angle in quadrant IV such that cosθ = 3/5. Find the exact values of cscθ and cotθ.?

[匿名]

回覆: 1

2017-05-27 10:21 am

How many mL of 0.750 M solution of lithium phosphate solution must be used to deliver 10.3 g of lithium?

[匿名]

回覆: 2

2017-05-20 12:02 am

A sample of nitrogen occupies 10.0 liters at 25°C and 98.7 kPa. What would be the volume at 20°C and 102.7 kPa?

[匿名]

回覆: 2

2017-05-17 2:31 pm

chemical equation of propane , C3H8+5O2 -->3CO2+4H2O How many grams of O2(g) are needed to completely burn 62.0 g of C3H8(g)?

[匿名]

回覆: 2

2017-05-17 1:00 am

what is the partial pressure of gas D in kPa (kilopascals)?

[匿名]

回覆: 1

2017-05-12 12:02 pm

pH Calculations?

[匿名]

回覆: 2

2017-05-10 8:33 am

why does CH3OH have a higher boiling point than F2 and CH3F?

[匿名]

回覆: 3

2017-05-10 12:43 am

Gas has a volume of 135mL at 0.600atm. What would be the volume if the pressure is decreased to 0.200atm while temperature is held constant?

[匿名]

回覆: 1

2017-05-09 1:51 pm

Consider the following reaction: 3NO2(g) + H2O(l) → HN....?

[匿名]

回覆: 2

2017-05-06 11:08 am

What is the pH of solution?

[匿名]

回覆: 1

2017-05-04 4:10 pm

what is the relative molecular mass of methylated spirits?

[匿名]

回覆: 2

2017-04-26 10:25 am

What is the pressure of the gas in this mercury manometer if h = 57 mm and atmospheric pressure is 769 mmHg?