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7.1 and 7.2 practice quiz
Terms in this set (15)
The substances that are present before a chemical reaction takes place are called_____?
Hydrochloric acid, HC1, is added to solid NaOH. After the reaction is complete, NaCl dissolved in water remains. What are the products of the chemical reaction?
NaCl and H₂O
Which of the following takes place during a redox reaction?
Electrons are both gained and lost
In a chemical reaction Fe2+. What happened to the iron atom?
It lost electrons and it was oxidized.
if there are 4 hydrogen atoms on the left side of the equation in figure 7-2 how many hydrogen atoms must be on the right side.
the statement that in chemical reactions, the total mass of the reactants equals the total mass of the products is the law of ________.
conservation of mass
In an experement, 44g of propane were burned, producing 132g of carbon dioxide and 72g of water. The mass of oxygen that was needed for the reaction was _________.
A ____________ is the number that appears before a formula in a chemical equation.
the molar mass of chlorine is ____________.
Butane burns as shown in the balanced chemical equation 2C4H10 + 13O2 ---> 10H2O + 8CO2. If 6 mol of butane burn, ________mol of carbon dioxide are produced.
An iron fence is left unpainted, and it reacts with the oxygen in the air, forming rust. The formation of rust is an oxidation-reduction reaction, it is also an example of a _____________ reaction.
The element ___________ is always present in a combustion rxn.
In a double-replacement reaction, ther are 2 reactants and ______________ products.
When flourine reacts with a metal, it forms an F- ion. The flourine atom has gained an electron and undergon _____________.
During a chenical reaction, energy is released during the ______________ of chemical bonds.
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