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
Komok [63]
3 years ago
7

PLEASE HELP : Craft the correct formulas of the following pairings using correct oxidation numbers (from round 1). Remember that

metals always go first and polyatomic ions go in parenthesis

Chemistry
1 answer:
finlep [7]3 years ago
5 0

Compounds provided below

\\ \tt\hookrightarrow Al(OH)_3

\\ \tt\hookrightarrow KCl

\\ \tt\hookrightarrow Ag_2S (AgS also possible but unstable)

\\ \tt\hookrightarrow Ca(CH_3COO)_2

\\ \tt\hookrightarrow (NH_4)_2CO_3

\\ \tt\hookrightarrow Fe(PO_4)_2

\\ \tt\hookrightarrow Na_2O

\\ \tt\hookrightarrow Pb(CrO_7)_4

You might be interested in
N
bazaltina [42]

Answer:

electron - proton

Explanation:

fsger

5 0
3 years ago
Read 2 more answers
Using the idea that reactions occur as a result of collisions between particles, explain why reaction rates depend on the temper
PIT_PIT [208]

Increasing temperatures in a reaction increases the kinetic energy of the reactant molecules. This causes them to move fast and hence collide with a higher frequency. The higher the rate of collision between the molecules, the faster the reaction.

6 0
3 years ago
Hydrogen and Methanol have both been proposed as alternatives to hydrocarbon fuels. Write balanced reactions for the complete co
Arlecino [84]

Answer:

The order of energy released per mass is

CH₃OH (-2.268 × 10⁴ kJ/kg) < C₈H₁₈ (-4.826 × 10⁴ kJ/kg) < H₂ (-2.835 × 10⁵ kJ/kg)

Explanation:

In order to calculate the enthalpy of a reaction (ΔH°r) we can use the following expression.

ΔH°r = ∑np × ΔH°f(p) - ∑nr × ΔH°f(r)

where

ΔH°f(i) are the enthalpies of formation of reactants and products

ni are the moles of reactants and products

<u>Combustion of hydrogen</u>

H₂(g) + 1/2 O₂(g) ⇒ H₂O(l)

ΔH°r = 2 mol × ΔH°f(H₂O) - 1 mol × ΔH°f(H₂) - 1/2 mol × ΔH°f(O₂)

ΔH°r = 2 mol × (-285.8 kJ/mol) - 1 mol × 0 - 1/2 mol × 0

ΔH°r = -571.6 kJ

571.6 kJ are released when 1 mole of H₂ is burned. The amount of heat released per kilogram is:

\frac{-571.6kJ}{1molH_{2}} .\frac{1molH_{2}}{2.016gH_{2}} .\frac{10^{3}gH_{2} }{1kgH_{2}} =-2.835 \times 10^{5} kJ/kgH_{2}

<u>Combustion of methanol</u>

CH₃OH(l) + 3/2 O₂(g) ⇒ CO₂(g) + 2 H₂O(l)

ΔH°r = 1 mol × ΔH°f(CO₂) + 2 mol × ΔH°f(H₂O) - 1 mol × ΔH°f(CH₃OH) - 3/2 mol × ΔH°f(O₂)

ΔH°r = 1 mol × (-393.5 kJ/mol) + 2 mol × (-285.8 kJ/mol) - 1 mol × (-238.4 kJ/mol) - 3/2 mol × 0

ΔH°r = -726.7 kJ

726.7 kJ are released when 1 mole of CH₃OH is burned. The amount of heat released per kilogram is:

\frac{-726.7kJ}{1molCH_{3}OH} .\frac{1molCH_{3}OH}{32.04gCH_{3}OH} .\frac{10^{3}gCH_{3}OH }{1kgCH_{3}OH} =-2.268 \times 10^{4} kJ/kgCH_{3}OH

<u>Combustion of octane</u>

C₈H₁₈(l) + 12.5 O₂(g) ⇒ 8 CO₂(g) + 9 H₂O(l)

ΔH°r = 8 mol × ΔH°f(CO₂) + 9 mol × ΔH°f(H₂O) - 1 mol × ΔH°f(C₈H₁₈) - 12.5 mol × ΔH°f(O₂)

ΔH°r = 8 mol × (-393.5 kJ/mol) + 9 mol × (-285.8 kJ/mol) - 1 mol × (-208.4 kJ/mol) - 12.5 mol × 0

ΔH°r = -5511.8 kJ

5511.8 kJ are released when 1 mole of C₈H₁₈ is burned. The amount of heat released per kilogram is:

\frac{-5511.8kJ}{1molC_{8}H_{18}} .\frac{1molC_{8}H_{18}}{114.2gC_{8}H_{18}} .\frac{10^{3}gC_{8}H_{18} }{1kgC_{8}H_{18}} =-4.826 \times 10^{4} kJ/kgC_{8}H_{18}

5 0
3 years ago
What Elements that have an atomic number less than 37 and atomic mass greater than 78.4u?
umka21 [38]

Answer:

krypton

bromine

selenium

4 0
2 years ago
How are minerals identified?
Y_Kistochka [10]
You can identify a mineral by its appearance and other properties. The color and luster describe the appearance of a mineral, and streak describes the color of the powdered mineral.
5 0
3 years ago
Other questions:
  • What would pressure be if volume was 0
    8·1 answer
  • Give an example of how you could use different reference frames for the same motion.
    9·2 answers
  • What are the characteristics of a gas? no definite shape but a definite volume a definite volume and definite shape a definite s
    6·2 answers
  • What is the volume of the sphere? Round your answer<br> to the nearest tenth.<br> cm
    7·1 answer
  • Explain how atomic interactions determine a material to be transparent and opaque
    14·1 answer
  • H-h+cl+cl____2h-cl... calculate the energy needed to break the bond​
    11·1 answer
  • Which of the following is an example of chemical weathering?
    7·1 answer
  • Four people make observations recorded in the table.
    12·2 answers
  • This is science help me pls
    15·1 answer
  • Identify the importance of water. check all that apply
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!