Ch9 deberry
according to the law of conservation of mass how does the mass of the products in a chemical reaction compare to the mass of the reactants
the masses are always equal
some baking soda and vinegar were weighted separately and the weights added together. the two substances are mixed and a chemical reaction occurred producing carbon dioxide sodium acetate and water when the three new substances are weighed and the weights totaled which of the following will be true
the two weights will be equal because the mass is the same
the bonds between the atoms of the water molecule have broken and instead of water there is now hydrogen and oxygen
what has happened to the water in the illustration
4
which figure models a single replacement reaction
endothermic reaction
which type of reaction requires more activation energy
metallic chlorates when heated results in metallic chlorides and oxygen
decomposition
a change in_____is a sgin of energy being used in a chemical reaction
temperature
which figure models a decomposition reaction
,
When a substance combines with O2 and releases energy, a ____________ reaction has occured
Combustion
____________ is a form of energy contained in chemical bonds.
Chemical Energy
Why is the law of conservation of mass true?
All atoms at the start of a chemical reaction are present at the end of the reaction
The French chemist, ________________ conducted experiments that led to the law of conversion of mass
Antwon Levoiser
Hydrogen peroxide _____________ and forms water and oxygen gas.
decomposes
Atoms rearrange when
Both A and B
Which figure models a double-replacement reaction?
I
Which figure models a synthesis reaction?
II
a catalyst is which of the following
Neither A or B
If two or more substances combine to produce one substance, a _________ reaction has occured
Synthesis
sulfur trioxide reacts with water to make sulfuric acid. This is a_____reaction
Synthesis
Which of the following changes is a chemical rather than physical?
Wood is burned
if the arrangement of atoms in a substance changes then which of the following true
a chemical reaction has occurred
Which of the following materials will burn fastest in open air?
a pile of small splinters made from a two-foot diameter log
Endothermic reactions_____
absorb more energy than they release
Breaking a chemical bond _____________ energy.
absorbs
Breaking a chemical bond
absorbs energy from surroundings
An explanation for the law of conservation of matter is that the same _____________ is present before and after the reaction.
atoms
Which of the following is NOT a result of a chemical reaction? bubbles boiling water a solid form from two liquids reacting copper turning green when exposed to air the light given off by a firefly
bubbles boiling water
Geoff observed an experiment in which one compound underwent a chemical reaction that produced two compounds. He classified this as a ______ reaction
decomposition
Chemical reactions_______
can either release more energy than they absorb or absorb more energy than they release, depending on the reaction.
which of the following is certain proof a chemical reaction has occurred
change of a chemical properties
Jaunita watched as two compounds reacted and changed into two different compounds. She determined the reaction that she observed was a ___________________ reaction.
double replacement
sodium fluoride and silver nitrate become sodium nitrate and silver chloride. Carbonate and hydrogen ions became water and carbon dioxide. This is a _____________ reaction
double-replacement
All substances _________
have a fixed arrangement of atoms
A(n) ____solows or stops a chemical reaction.
inhibitor
Which one of the following factors would not speed up a chemical reaction
making the reactant particles larger
The __________ switch places in a double-replacement reaction
negative ions
Each substance written to the right of the arrow in a chemical equation is a ____.
product
Forming a chemical bond
releases energy into surroundings
an exothermic reaction
releases thermal energy
Kalina conducted an experiment in which she started with one element and cone compound and ended up with a different element and a different compound. She classified this as a ___________ reaction
single replacement
Zinc Combines with hydrochloric acid, the zinc replaces hydrogen. THe chemical equation for this reaction look like Zn+2HCI -----> ZnCI^2 + H^2
single-replacement