General Chemistry Answers

3.00 g of Mg reacts with 2.20 g of O2 in the following reaction :

2 Mg  +  O2  → 2 MgO

Identify the limiting reactant and calculate the mass of MgO produced by this reaction. 

Give the condensed structured formula of the following.

a. 1,2-Dimethylcyclohexane

b. 4-ethyl-1,1-dimethylcyclohexane

c. 4-ethyl-2,3-dimethyloctane

d. 1,2-dimethylcylcohexane

e. 2,5,6-trimethylnonane

f. 1-ethyl-3-methylcyclohexane

g. 2-ethyl-2-methylheptane

h. 4-methyl-2-pentene

i. 4-methyl-2-pentyne

Explain how the effective nuclear charge changes on going from oxygen to fluorine and whether you would expect this change to have a more profound effect on the 1s orbital or a 2p orbital. 

Oxygen (O₂) gas is observed to diffuse through a capillary for 18 seconds. How long will it take for methane gas (CH₄) to diffuse through the same orifice under identical conditions of temperature and pressure?

1. How many liters of O_{2 (g)} at STP is needed to completely burn 20.0 L of butane (C₄H₁₀), with this reaction?

2 C₄H_{10 (g)} + 13 O_{2 (g)} → 8 CO_{2 (g)}  + 10 H₂O _(l)

Oxygen (O₂) gas is observed to diffuse through a capillary for 18 seconds. How long will it take for methane gas (CH₄) to diffuse through the same orifice under identical conditions of temperature and pressure? (10 points)

When a dillute solution of 20 volume hydrogen peroxide solution was heated the total volume of oxygen collected was 120cm^3 in just 15min. What is the rate of formation of oxygen?

• How do I know if something is an acid so I can avoid eating it?

• Are two atoms of the same element identical?

10 moles of calcium sulphate

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