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science chp7 test
Terms in this set (21)
The substances that are present before a chemical reaction takes place are called....
which of the following does NOT state what the arrow means in a chemical equation?
How many atoms are present in 2 molecules of chromium?
6.02 x 10(23) atoms
How many moles of Cr are in 156 g of the element?
The coefficients in a balanced chemical equation always can express the ration of...
mass of reactants and products
Which of the following is NOT always true about a synthesis reaction?
the general formula is A + B --> C
Which of the following takes place during a redox reaction?
Electrons are both gained and lost
In a compound, chemical energy is contained in the....
The total amount of energy before and after a chemical reaction is the same. Thus, energy is....
In general, if the temp. of a chemical reaction is increased, reaction rate...
A log is burning in a fireplace. If the amount of oxygen reaching the log is decreased, which of the following statements is true?
The reaction rate decreases
When the forward and reverse paths of a change occur at the same rate,
the system is in equilibrium
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
a ________________ is the number that appears before a formula in a chemical equation.
The molar mass of chlorine is __________.
the element _______________ is always present in a combustion reaction.
In a double-replacment reaction, there are two reactants and __________ products.
When flourine reacts with a metal, if forms an F ion. The flourine atom has gained an electron and undergone __________________.
In terms of energy, the general chemical equation AB + CD + energy --> AD + CB represents a ________________________.
Measuring how quickly a reactant disappears is one way to measure the ____________________ of the reaction.
The statement that when a change is introduced to a system in equilibrium shifts in the direction that relieves the stress on the system is known as _____________________.
Le Chateliers Principle
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