wanszeto

[匿名]

回覆: 2

2018-01-16 7:16 pm

In a compound X2O3 the ratio of mass of X to the mass of compound is 7/19 if the atom of element X has a total of 7 neutrons in it's nucleus?

[匿名]

回覆: 2

2018-01-13 7:27 pm

How many moles of Nickel is needed which will completely melt at 3, 120 J of heat. The enthalpy of fusion of nickel is 298 J/g.?

[匿名]

回覆: 1

2018-01-13 12:47 pm

Rank the following oxides in order of increasing aqueous acidity: Cs2O, Li2O, K2O. (From the least acidic to most - and please explain!)?

[匿名]

回覆: 1

2018-01-13 12:57 pm

Rank the following elements... A) in order of decreasing EN: In, Rb, I. & B) order of decreasing number of valence electrons: Sb, S, Cs.?

[匿名]

回覆: 2

2018-01-12 9:05 pm

Chemistry?

[匿名]

回覆: 3

2018-01-12 5:58 pm

Solve: 3/8(14x-2)-1/2{4x-(1-x)}=x+3/2?

[匿名]

回覆: 1

2018-01-12 5:09 pm

The minimum concentration of o2 necessary for a fish to live in an aquarium is 4mg/L?

[匿名]

回覆: 7

2018-01-12 4:13 pm

Math problem please help?

[匿名]

回覆: 3

2018-01-12 3:05 pm

how does the solubility of table salt and table sugar in room temperature water change with the volume of solution?

[匿名]

回覆: 2

2018-01-12 10:28 am

What Molarity is 32.66g H3PO4 (phosphoric acid) in 1 liter of water?

[匿名]

回覆: 2

2018-01-11 5:29 pm

How many mL of 0.4M sulfuric acid solution should be used to neutralize 8 gr of NaOH?

[匿名]

回覆: 1

2018-01-11 12:01 am

why or how is diamond stronger than silicon dioxide?

[匿名]

回覆: 4

2018-01-10 4:29 pm

reaction rate for nitric acid solution with sodium hydroxide.?

[匿名]

回覆: 3

2018-01-10 3:46 pm

Find the mistake a=b a*a=a*b a^(2)=a*b a^(2)-b^(2)=ab-b^(2) (a-b)*(a+b)=b(a-b) a+b=b 2b=b 2=1?

[匿名]

回覆: 2

2018-01-10 1:02 pm

Is it possible to use tap water to make these solutions in the iodine clock reaction?

[匿名]

回覆: 7

2018-01-10 12:21 pm

Give the rule for y against x^2 which is marked at the point 2,6?

[匿名]

回覆: 1

2018-01-10 12:17 am

physics help?

[匿名]

回覆: 2

2017-11-10 1:02 pm

Chemistry?

[匿名]

回覆: 1

2017-11-10 2:32 pm

Write the empirical formula for at least four ionic compounds that could be formed from the following ions: NH+4 , Pb+4 , OH− , CH3CO−2?

[匿名]

回覆: 1

2017-11-10 9:40 am

You pipet 5.00 mL of 3.58x10^(-3) M HCL into a 25.00 mL volumetric flask. What is the molarity of the diluted solution.?

[匿名]

回覆: 1

2017-11-09 3:46 pm

Equilibrium question?

[匿名]

回覆: 2

2017-11-08 12:06 pm

chemistry?

[匿名]

回覆: 1

2017-11-08 2:50 pm

what is the standard temperature and pressure (STP) for gases?

[匿名]

回覆: 1

2017-11-07 2:08 pm

Mass to mass: Calculate the number of grams of silver chloride produced from 16.4g of silver nitrate. AgNO3+BaCl2->AgCl+Ba(NO3)2. Thanks!?

[匿名]

回覆: 2

2017-11-07 2:10 pm

Mass to mass: How many grams of barium chloride are needed to produce 89.0g of barium nitrate? AgNO3+BaCl2->AgCl+Ba(NO3)2 Thanks!?

[匿名]

回覆: 1

2017-11-07 9:00 pm

A sample of argon gas occupies a volume of 8.81 L at 69 °C and 0.4940 atm. If the volume of the gas sample is decreased to 7440.0 mL, whil?

[匿名]

回覆: 1

2017-11-07 11:17 am

What mass of water (in grams) is produced by the reaction of 11.0 g of SiO2 ?

[匿名]

回覆: 1

2017-11-07 11:17 am

How many moles of HF will react completely with 13.6 mol of SiO2 ?

[匿名]

回覆: 1

2017-11-07 9:50 am

Calculate the mass of carbon dioxide?

[匿名]

回覆: 2

2017-11-06 9:55 pm

the high temperature generated by the burning of acetylene c2h2 finds application in the acetylene torch used for cutting and welding?

[匿名]

回覆: 2

2017-11-06 3:40 pm

I NEED HELP!!! Gas laws!!!?

[匿名]

回覆: 1

2017-11-06 3:50 pm

A 0.03313 M solution was prepared by dissolving copper wire?

[匿名]

回覆: 1

2017-11-06 1:43 pm

The greater the ionization energy of metals the greater desire it has to gain an electron?

[匿名]

回覆: 1

2017-11-06 12:03 pm

what mass of AgBr, silver bromide, is produced by reaction of 88.8 g of FeBr3, with excess AgNO3?

[匿名]

回覆: 1

2017-11-06 10:32 am

What is the net ionic equation of: zinc metal and manganese(II) bromide(aq) ?

[匿名]

回覆: 2

2017-11-05 9:20 pm

Chemistry acid-base Help Please!?

[匿名]

回覆: 2

2017-11-05 5:31 am

In a mixture of gases,neon has a mole fraction of 0.50, argon has 0.3, and xenon has 0.2. Which gas will have the greatest partial pressure?

[匿名]

回覆: 2

2017-11-04 11:04 pm

Can an acid react with its conjugate base ?

[匿名]

回覆: 2

2017-11-04 12:38 pm

Assuming equal concentrations, rank these solutions by pH. Ca(OH)2(aq) KOH(aq) NH3(aq) HClO4(aq) HF(aq)?

[匿名]

回覆: 1

2017-11-03 11:47 am

3.30 g of toluene (C7H8) is burned in a bomb calorimeter. The following reaction occurs.?

[匿名]

回覆: 1

2017-11-01 11:12 am

When 10.33 g of neon is combined in a 23.76 L container at 94oC with 8.39 g of argon, what is the partial pressure (in mmHg) of argon?

[匿名]

回覆: 2

2017-11-01 10:30 am

3.5 moles of an unknown element have a mass of 414.25 grams, what is this element?

[匿名]

回覆: 1

2017-11-01 9:20 am

If 856 J of heat was absorbed by a block of iron that weighs 55.0 g, calculate the change in temperature of the block of iron.?

[匿名]

回覆: 1

2017-10-31 10:27 pm

Chemistry: it's height is 4301 m above sea level what is the altitude in kilometers?

Christopher

回覆: 4

2017-10-31 5:49 pm

What's dy/dx of math?

[匿名]

回覆: 1

2017-10-31 10:36 am

What is the concentration in ppm of a 150.0 g solution with 0.00500 g of NaNO3 dissolved in it?

[匿名]

回覆: 2

2017-10-31 10:51 am

What is the exp yld when 18.3mL of a .6 M sol of iron(3) chloride is combined with 18 mL of a .679 M sol of silver nitrate at a .825 yield?

[匿名]

回覆: 1

2017-10-31 12:20 am

can any one help me to solve these questions?

[匿名]

回覆: 1

2017-10-30 10:08 am

If the flask volume is 4.50 L, and the air is at standard temperature and pressure, how many gaseous molecules does the flask contain?

[匿名]

回覆: 1

2017-10-30 12:50 pm

A student measures 5 mL of .356 M stock solut'n and pours it into a 250 mL v-metric flask, which is filled to the mark with DI water & mixed?