General Chemistry Answers

Assign an oxidation number to each element in the reaction.

CO(g) + 2H₂(g) → CH₃OH(g)

In CO, the oxidation number of C is , and that of O is . In H₂, the oxidation number of H is . In CH₃OH, the oxidation number of C is , that of O is , and that of H is . 

Give the range of absorbtion of the different electromagnetic radiation

The chemical formula for strontium sulfide is Sr

S

.

A chemist determined by measurements that 

0.0100

moles of strontium sulfide participate in a chemical reaction. Calculate the mass of strontium sulfide that participates.Round your answer to 

3

significant digits.

g

4(3)H2OOHH(4)2.Which of the following reactions will NOTtake place?(1)CH3CH2CH2BrNaN3ethanol-waterCH3CH2CH2N3(2)CH3CH2CH2BrNaIacetoneCH3CH2CH2I(3)CH3CH2CH2BrCH3CH2CH2CH3NaSCH3(4)CH3CH2CH2BrCH3CH2CH2OCCH3

Which of the following IS NOT A CORRECT presentation of electron movement/flow

1.    Write a word equation to represent each of the following reactions. Then balance each equation including all the states of matter. 

d)   Aluminum chloride reacts with sodium carbonate and yields aluminum carbonate and sodium chloride. Aluminum carbonate forms a solid precipitate while aluminum chloride, sodium carbonate, and sodium chloride are all soluble in water.

word equation:

balanced equation:

e)   The complete combustion of propane (C₃H₈) gas results in the production of carbon dioxide and water vapour (remember that combustion reactions can only occur in the presence of oxygen gas).

word equation:

balanced equation:

Write a word equation to represent each of the following reactions. Then balance each equation including all the states of matter.

a)   Solid aluminum metal combines with fluorine gas to produce solid aluminum fluoride.

word equation:

balanced equation:

b)   Potassium metal combines with oxygen gas to produce solid potassium oxide.

word equation:

balanced equation:

c)    Lithium sulphate combines with barium chloride and produces solid barium sulphate and aqueous lithium chloride. Both of the reactants are dissolved or are soluble in water (aqueous).

word equation:

balanced equation:

1.    For each word equation below provide the skeleton equation; then balance the skeleton equation. Remember to include all the states of matter.

a)   methane + oxygen → carbon dioxide + water

skeleton equation:

balanced equation:

b)   sodium + chlorine → sodium chloride

skeleton equation:

balanced equation:

c)    iron(II) oxide → iron + oxygen

skeleton equation:

balanced equation:

d)   cupric oxide → copper + oxygen

skeleton equation:

balanced equation:

e)   calcium + water → calcium hydroxide + hydrogen gas

skeleton equation:

balanced equation:

Prepare a solution of CaCO₃ using percent composition by mass (13 %), molarity (2.5 M), molality (1.4 m), and normality (5.0 N).

Find out the volume of 0.03 M HCl required to neutralize 150 ml of 0.02 M Ca(OH)2 solution.