16,925 Answered Questions for the topic chemistry

Chemistry

1h

Calculate the pH p H of each solution and indicate whether the solution is acidic or basic.

[H3O+]=5.3×10^-5M[OH−]=6.6×10^-3M
Chemistry

4h

calculate the volume gas in litre of 2.57 mole have a pressure of 1.86 atm at a temperature of -12

calculate the volume gas in litre of 2.57 mole have a pressure of 1.86 atm at a temperature of -12
Chemistry

8h

A half-cell containing chlorine and chloride ions is connected to a half-cell containing nickel ions and nickel to form a voltaic cell.

Determine the proper direction for each half-cell reaction to assure a spontaneous, complete cell reaction, and find the value of E°.
Chemistry

9h

A half-cell containing bromine and bromide ions is connected to a half-cell containing sulfur and sulfide ions to form a voltaic cell.

Determine the proper direction for each half-cell reaction to assure a spontaneous, complete cell reaction. Find the value of E°. The two half-cell reactions and their electrode potentials are as... more
Chemistry

15h

On a recent road trip, your average speed was 66 miles per hour. What was your average speed in (

On a recent road trip, your average speed was 66 miles per hour. What was your average speed in (a) mi/s; (b) m/s ?
Chemistry

15h

Equation solving for chemistry

How many grams of KClO3 are needed to form 26.4 g of O2?2KClO3(s)—>2KCl(s)+3O2(g)step one show strategy for solving this problem.1: grams O2–> _______—>_______—>grans KClOanswer... more
Chemistry

16h

Carry out each of the following conversations

Carry out each of the following conversations a. 62.25oz to g =_gb. 53in to cm = _ cm
Chemistry

16h

Scientific notation

A picosecond is one trillionth of a second (0.000 000 000 001 s) . (a) Write this number in scientific notation. (b) How many picoseconds are there in one second? Write this answer in scientific... more
Chemistry

18h

Having trouble with steps

2 C4H10 + 13 O2 → 8 CO2 + 10 H2OHow many grams of C4H10 are needed to react with 51.40 grams of O2? 
Chemistry

18h

Reaction Stoichiometry

Consider the following reaction:2 Na + 2HCl → 2 NaCl + H2How many mols of hydrogen gas (H2) can be produced if you begin with 11.92 grams of HCl:
Chemistry

21h

Write the net ionic equation,including phases, that corresponds to the reaction Cu(NO3)2(aq)+Na2S(aq)----->CuS(s)+2NaNO3(aq)3

ALL numbers in equation are subscripts
Chemistry

23h

Chemistry problem

Liquid hexane (CH3(CH2)4CH3) will react with gaseous oxygen (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O) . Suppose 38. g of hexane is mixed with 96.3 g of oxygen. Calculate... more
Chemistry

1d

Significant figures

Carry out each calculation and report the answer using the proper number of significant figures . a. 65.4 * 0.21 b. 92.0/18 c. 840.8 * 0.4
Chemistry

1d

Significant figures

How many significant figures does each number contain ?a. 8.080 * 10 ^ 28
Chemistry

1d

Significant figures

Carry out each ealeulation and give the answer using the proper number of significant figures.a. 15.90*3.4= b. 113.5 * 22 =
Chemistry

1d

Calculate how many moles in 90.4 grams Cl2

90.4 g Cl2 x ?/?=
Chemistry

1d

Calculate how many moles in 90.4 grams Cl2

90.4 g Cl2 x ?/?=
Chemistry

1d

Console the setup below and then calculate how many molecules are in 15.0 grams CO2

15.0 g CO2 x ?/? X ?/?=?
Chemistry

1d

can someone please help?

2 Cu + S  →  Cu2S When 98.6 g of copper reacts with 41.2 grams of sulfur What is the % yield if 96.2 grams of product are formed?
Chemistry

1d

can someone please help me with this asap?

5. Students in chemistry lab dissolve 54.07 g of Pb(NO3)2 in 100 mL of distilled water. 5.00 g of calcium metal is added and a reaction occurs. The precipitate formed is washed with distilled... more
Chemistry

1d

can someone help me with this please?

2Mg   +  O2  →  2MgO4. When students placed 6.22 g Mg in a crucible and allowed the metal to burn in air, they achieved a 96.3 % yield of MgO.   Complete the following data table: Mass of empty... more
Chemistry

1d

can someone please help me with this asap?

. Copper reacts with sulfur to form copper (I) sulfide according to the following reaction:   2 Cu + S  →  Cu2S When 98.6 g of copper reacts with 41.2 grams of sulfur  What is the % yield if 96.2... more

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