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Dalal
Questions and answers by visitors named
Dalal
Questions (20)
Two workers pull horizontally on a heavy box, but one pulls twice as hard as the other. The larger pull is directed at 25.0 ∘
1 answer
832 views
A student performed an analysis of a sample for its calcium content and got the following results:
14.92% , 14.91%, 14.88% ,
5 answers
3,762 views
Which of the following are exact numbers?
a. There are 100 cm in 1 m. b. One meter equals 1.094 yard. c. We can use the equation:
3 answers
2,282 views
A copper wire (density=8.96 g/cm^3) has a diameter of 0.25 mm. If a sample of this copper wire has a mass of 22 g, how long is
4 answers
3,756 views
Convert 0.0904 in^3 to liters.
(2.54 cm = 1 inch, 1 L= 1000 cm^3, 1 ft = 12 inches) Really appreciate it if you can show steps
1 answer
452 views
The mass of a dry, 50 mL beaker is 49.135 g. The observed volume of water in a volumetric pipet is 20.00 mL. This water is
7 answers
3,907 views
Name each of the following compounds:
a. CrO3 c. Al2O3 e. CaBr2 b. Cr2O3 d. NaH f. ZnCl2
5 answers
658 views
Write the formula for each of the following compounds:
a. cesium bromide b. barium sulfate c. ammonium chloride d. chlorine
4 answers
890 views
Several compounds containing only sulfur (S) and fluorine (F) are known. Three
of them have the following compositions: i. 1.188
4 answers
5,506 views
Which of the following pairs of compounds can be used to illustrate the law of multiple proportion?
a) NH3 and NH4Cl b) ZnO2 and
4 answers
4,140 views
Thanks in advance.
A student prepared a solution of NaCl by dissolving 55.0 grams of sodium chloride in 570 mL of water. What is
2 answers
1,309 views
A graduated cylinder has a mass of 80.4 g when empty. When 20.0 mL of water is added, the graduated cylinder has a mass of 100.4
4 answers
3,238 views
Need help, please.
A copper wire (density = 8.96 g/cm^3) has a diameter of 0.25 mm. If a sample of this copper wire has a mass of
2 answers
1,229 views
A water chemist obtained a 250 ml sample from a nearby lake and fixed the oxygen on-site with alkaline solutions of MnSO4 and
4 answers
2,528 views
a 20.94-g sample of an unknown metal is heated to 99.4 degrees Celsius in a hot water bath until thermal equilibrium is reached.
3 answers
3,348 views
A 5.00-g sample of KBr at 25.0 C dissolves in 25.0 mL of water also at 25.0 C. The final equilibrium temperature of the
4 answers
1,393 views
5.00 g of (Zn) was added to 0.800 moles of nitrate ion in acidic media.
Calculate the volume of (NO) gas collected at STP. Zn(s)
3 answers
403 views
Use the generalized compressibility chart to estimate z for (a) nitrogen at 40°C and 40 MPa and (b) helium at -200°C and 350
1 answer
1,125 views
Consider the polar curve: r=3cos(3ϴ)
a) Find the area of the first leaf of the graph. -Thank you.
2 answers
705 views
Find the power series representation about the center c=0 of
(a) f(x)= 1/(1+x^2) (b) Use part (a) to find the power series of
2 answers
1,220 views
Answers (9)
Correction: Zn(s) + NO3^-(aq) ---------> ZN^2+(aq) + NO(g)
In addition, 5. a) What is the procedure for preparing 250 mL of 0.0210 M Na2S2O3 for this experiment from a 100-mL volume of standard 0.106 M Na2S2O3? b) For the preparation of the 0.0210 M solution in a 250-mL volumetric flask, only a 25.0 mL calibrated
Thank you. :)
Without Google! Whats the theoretical way to solve them?
If possible could you briefly explain why as well please.
The thing is I really want to understand them without google?..Because I won't have google during my exam..Thanks anyways..
Thank you so much for your help. I actually sent the second one because I realized I had forgotten to say please in the first one.
Really need some help solving these please.
2.000 g
