Chemical Reaction- Mr. K
Terms in this set (82)
Which of the following names the process by which chlorophyll breaks down into new substances?
A process in which one or more substances change to form new substances is called a
How do the properties of the new substances compare with the properties of the original substances after a chemical change takes place?
They may differ in chemical and physical properties.
A solid substance that is formed in a solution is called a
thermal energy produced by a fire
white spots caused by the bleach
What is the most important sign that a chemical reaction is occurring?
formation of new substances that have different properties
When a gas is given off as a liquid boils, it is an example of a _____ change, not a _______ reaction.
What is a chemical bond?
is a force that holds two atoms together in a molecule
What is the relationship between a chemical reaction and the making and breaking of chemical bonds?
In a chemical reaction, the bonds between atoms in molecules break, the atoms rearrange, and new chemical bonds form. The new arrangement of atoms produces new substances.
How many atoms make up a diatomic molecule?
About how many elements make up all known substances?
The subscript in the chemical formula H2O tells you there are two
atoms of hydrogen in the molecule
What is the chemical formula for oxygen?
What is the chemical formula for water?
What is the chemical formula for glucose?
A combination of chemical symbols and numbers that represent a substance is called a
Covalent compounds are usually composed of two
The formula for carbon dioxide is
Ionic compounds are composed of a ____and_____.
The overall charge of an ionic compound is
When chemical symbols and formula are used as a shortcut to describe a chemical reaction, it's called a
A substance that forms in a chemical reaction is called a
A substance or molecule that participates in a chemical reaction is called a
When carbon reacts with oxygen to form carbon dioxide, carbon dioxide is the
In a chemical reaction, _____ are never gained or lost.
The number placed in front of a chemical symbol or formula is called a
How many oxygen atoms are cottoned in the formula 2CO2?
Which of the following is not a type of a chemical reaction?
What do all of the types of reactions have in common?
Each type of reaction has a pattern that
shows how reactants become products.
When two or more substances combine to form one new compound, it is called a
When a single compound breaks down to form two or more simpler substances, it is called a
When all element replaces another element in a compound, it is called a
single- displacement reaction
In a single- displacement reaction, a _______ reactive element can replace a ______ reactive element from a compound.
Most single- displacement reactions involve ______.
In a double- displacement reaction, a ______ or a _______ forms from the exchange of ions between two compounds.
solid precipitate; molecular compound
Zinc reacts with hydrochloric acid to form zinc chloride and hydrogen
Carbonic acid decomposes to form water and carbon dioxide
Sodium reacts with chlorine to form sodium chloride
Sodium fluoride and silver chloride are formed from the reaction of sodium chloride with silver fluoride.
The reaction H2O + C yields H2 +CO represents a ____ reaction
All chemical reactions either give off or absorb _____
Why is chemical energy a part of all chemical reactions?
Energy is needed to break chemical bonds in reactions
When energy is released during a chemical reaction, it's called an _____ reaction
When energy is taken in during a chemical reaction, it is called an ______ reaction.
Photosynthesis is an example of an ______
What does the law of conservation of energy state?
States that energy can't be created nor destroyed.
What happens to the energy taken in during endothermic reactions?
Energy is stored in the products.
The speed at which new particles form is called the
rate of reaction
What 4 factors affect how rapidly a chemical reaction takes place?
Temperature, concentration, surface area, and the presence of a catalyst or an
inhibitor affect reaction rates.
The smallest amount of energy needed to start a chemical reaction is called
As temperature increase, the rate of reaction
A measure of the amount of one substance that is dissolved is called
How does increasing concentration increase the rate of reaction?
distance between the particles is smaller; the particles are able to collides more frequently.
The amount of exposed surface of a substance is called
How can you increase the surface area of a solid reactant?
You can increase the surface area of a solid reactant by grinding the reactant into a powder.
A substance that slows down or stops a chemical reaction is called an
Give 1 example of an inhibitor
food, preservatives, antibiotic drugs
A substance that speeds up a reaction without being permanently changed is called a
How can the rate of a chemical reaction be increased?
Ways to increase the rate of a chemical reaction include raising the temperature,
increasing the surface area of a solid reactant, increasing the concentration of the reactants, or adding a catalyst.
is a process in which one or more substances change to make one or more new substances.
is a solid substance that is formed in a solution.
is a shorthand way to use chemical symbols and numbers to represent a substance.
uses chemical symbols and formulas as a shortcut to describe a chemical reaction.
The substances formed from a reaction are
The starting materials in a chemical reaction are
states that mass cannot be created or destroyed in ordinary chemical and physical changes.
law of conservation of mass
is a number that is placed in front of a chemical symbol or formula. For example, 2CO represents two carbon monoxide molecules. The number 2 is the coefficient.
is a reaction in which two or more sub- stances combine to form one new compound.
is a reaction in which a single compound breaks down to form two or more simpler substances.
a reaction in which one element or radical takes the place of another element or radical in a compound.
is a reaction in which ions from two compounds exchange places.
A chemical reaction in which energy is released is called an
A chemical reaction in which energy is taken in is called
states that energy cannot be created or destroyed.
law of conservation of energy
is the smallest amount of energy that molecules need to react.
is a substance that slows down or stops a chemical reaction.
is a substance that speeds up a reaction without being permanently changed.
Unbalanced equation: H2+O2 yields 2H2O
Balanced equation: 2