Chem Mid-Term Review
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- Does phlogiston exist?
- No way Jose
- Who first isolated the gas we now call oxygen?
- Joesph Priestly
- Give two names for the chemical Preistly decomposed to produce oxygen?
- mercury (II) oxide, HgO, mercuric oxide
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Give the equation for this decomposition reaction...
mercuric oxide decomposes to produce oxygen - 2 HgO ---> 2 Hg + O2
- Who first explained burning?
- Antoine Lavosier
- How do chemistsdescribe burning?
- it involves a chemical combination with oxygen
- Will the ashes in your fireplace that result from butning a log weigh more, less or the same as the weight of the log? Explain why.
- Less because all the oxygen in the long will burn away and it would leave just carbon.
- Does oxygen burn?
- yes
- Does oxygen support combustion?
- Yea baby!!
- We produce oxygen in the lab by decomposing a solution of hydrogen peroxide. Write the equation.
- 2 H2O2 ----> 2 H2O + O2
- When we burn sulfur it seens to disappear. Why is there no residue and where did the sulfur go?
- Sulfur burns to produce a gas which goes into the air
- Is burning a physical or chemical change?
- chemical
- Is burning an endothermic or exothermic change?
- exothermic
- Does carbon dioxide burn?
- no
- Does carbon dioxide support the combustion of wood, paper, coal, etc?
- No
- Does carbon Dioxide support the combustion of metals such as Mg, AL, Zn?
- Yes
- When carbon dioxide reacts with water what acid is formed?
- Carbonic acid
- Starting materials in a chemical reaction
- reactants
- ending materials in a chemical reaction
- products
- the word that is used to read the arrow in an equation
- yeilds
- a term meaning hot, melted material
- molten
- a term meaning decomposition by the use of electricity
- electrolisis
- an insoluble solid formed during a chemical reaction
- precipitate
- the term usd for the numbers we insert to balance an equation
- coefficients
- a word meaning a gas is being released
- effervasence
- combustion is a word that means ______
- burn
- we balance equations to obey the Law of ___________
- conservation of matter
- a material htat is added to a reaction to speed it up but is not consumed itself.
- catalyst
- a reaction that gives off heat is said to be ___________
- exothermic
- a reaction that requires the addition of heat is said to be ___________
- endothermic
- our common fuels contain only the elements carbon and bydrogen and are called ___________
- hydrocarbons