1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
densk [106]
3 years ago
9

The following balanced equation shows the decomposition of water (H2O). According to the equation, how many oxygen atoms are in

the reactants? 2 H2O 2H2 + O2
Chemistry
2 answers:
Vlada [557]3 years ago
4 0

<u>Answer:</u> There are 2 oxygen atoms on the reactant side.

<u>Explanation:</u>

Every balanced chemical equation follows law of conservation of mass.

This law states that mass can neither be created nor be destroyed, but it can only be transformed from one form to another form.

This law also means that total number of individual atoms on the reactant side will always be equal to the total number of individual atoms on the product side.

The given balanced chemical equation follows:

2H_2O\rightarrow 2H_2+O_2

<u>On reactant side:</u>

Number of hydrogen atoms = 4

Number of oxygen atoms = 2

<u>On  product side:</u>

Number of hydrogen atoms = 4

Number of oxygen atoms = 2

Hence, the number of oxygen atoms on the reactant side is equal to 2.

Andre45 [30]3 years ago
3 0

The following balanced equation, 2H2O = 2H2 +O2, shows the decomposition of water (H2O). According to the equation, there are two oxygen atoms in the reactants and another two oxygen atoms in the product side.

You might be interested in
After distilling your crude methyl benzoate, you set aside 4.83 grams of the purified ester. You then prepare the grignard reage
Ber [7]

Answer:

95.6 %

Explanation:

For this question, we will have <u>2 reactions</u>, the formation of the <u>grignard reagent</u> and the <u>formation of the alcohol</u>. The first step then is the calculation of the <u>maximum amount</u> of the grignard reagent. For this, we have to convert the grams to moles and check the smallest value. To do this we have to take into account the <u>following conversion ratios</u>:

Molar mass of Mg = 24 g/mol

Molar mass of phenylmagnesium bromide (C_6H_5Br)= 157 g/mol

Density of bromobenzene= 1.5 g/mL

Molar ratio between Mg and  C_6H_5Br= 1:1

2.3~g~Mg\frac{1~mol~Mg}{24~g~Mg}=0.096~mol~Mg

9.45~mL~\frac{1g}{1.5mL}\frac{1~mol~C_6H_5Br}{157~g}=0.0402~mol~C_6H_5Br

The smallest value is the mol of bromobenzene therefore <u>0.0402 mol</u> of phenylmagnesium bromide would be produced.

The next step is repite the same steps for the reaction of <u>formation of the alcohol</u>. Therefore we have to find the moles of methyl benzoate, so:

Molar mass of methyl benzoate: 136.14 g/mol

4.83~g~\frac{1~mol}{136.14~g}=0.35~mol

The we have to <u>divide by the coefficient</u> of each reactive in the balance reaction. So:

\frac{0.35~mol}{1}=0.35

\frac{0.0402~mol}{2}=0.0201

Therefore the <u>limiting reagent</u> would be the phenylmagnesium bromide. Now, the <u>molar ratio</u> between the phenylmagnesium bromide and triphenyl carbinol is <u>2:1</u>, so the amount of alcohol produced is 0.0201 mol triphenyl carbinol. The next step is the conversion from mol to <u>grams of triphenyl carbinol</u>:

Molar mass of triphenyl carbinol= 260.33 g/mol

0.0201~mol\frac{260.33~g}{1~mol}=5.23~g~triphenyl carbinol

Finally, we have to <u>divide</u> the obtanied solid by the calculated one:

Percentage=\frac{5}{5.23}*100=95.6\%

5 0
3 years ago
Choose the correct statement. The cathode is the electrode where the oxidation takes place. Both oxidation and reduction may tak
gregori [183]

Answer:

The cathode is the electrode where the reduction takes place.

Explanation:

Cell has three components:

an electrolyte and two electrodes which is a cathode and an anode.

Electrolyte is usually solution of the water or other solvents in which the ions are dissolved.

<u>In electrolytic cell:</u>

Negatively charged electrode is the cathode where the process of reduction takes place.

Positively charged electrode is the anode where the process of oxidation takes place.

<u>In galvanic cell:</u>

Positively charged electrode is the cathode where the process of reduction takes place.

Negatively charged electrode is the anode where the process of oxidation takes place.

<u>So, the correct answer is - The cathode is the electrode where the reduction takes place.</u>

6 0
3 years ago
Which of the following equations is balanced for charge and mass?
Nataliya [291]
<span>B. S⁰(s) + 2H⁺ + 2e⁻ –--> H2S⁰(g)

by mass: 1 S  and 2 H ----> 2 H and 1S  True.
by charge : 0 +(2*(+1)) + 2*(-1) = 0, 0+2-2=0, 0 = 0  True.</span>
8 0
3 years ago
Read 2 more answers
Metals react with ______ to form compounds that are alkaline.
kondor19780726 [428]

Metals react with ______ to form compounds that are alkaline.

A. metalloids

B. oxygen (O)

C. non-metals

D. hydrogen (H)

The answer is D, Hydrogen (H).

7 0
3 years ago
Read 2 more answers
Can u explain to me how to do this? This is my first time doing this type of question so explain or give me some of the answers
WITCHER [35]
Bruh bruh bruh bruh bruh bruh
5 0
3 years ago
Read 2 more answers
Other questions:
  • How many significant digits are in the volume measurement 4010,0 mL? A) 2 B) 3 C) 4 D) 5 E) none of the above
    15·1 answer
  • What is the name of the state when electrons absorb energy and move to a higher energy level?
    12·1 answer
  • Cual de los estados de agregacion es mas abundante en el universo
    5·1 answer
  • How many carbons are in a molecule of hexane?<br> a. 2<br> b. 4<br> c. 6<br> d. 8
    14·1 answer
  • In a problem, you are given two pressures and one temperature at constant volume and amount of gas. You are asked to find a seco
    15·2 answers
  • Which statement is correct regarding the rate of the reaction below? 3A + B yields 4X + 2Y
    8·1 answer
  • The more the particles an object has at a given temperature, the more thermal energy it has. True or false
    10·2 answers
  • One liter of gas A at 1.0 atm pressure has a temperature of 25°C while the same volume and pressure of gas B has a temperature o
    8·1 answer
  • Assuming the partial pressure of oxygen in air (0.20 atm) and nitrogen in air (0.80 atm). Calculate the mole fractions of oxygen
    14·1 answer
  • Electrophilic aromatic substitution of furan favors addition to the 2-position because the intermediate cation is more stable th
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!