a description of a reaction using element symbols and chemical formulas

(a)  

the starting substances in a chemical reation

(a)  

the substances produced by the chemical reaction

(a)  

states that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction

(a)  

a number placed in front of an element symbol or chemical formula in an equation

(a)  

a type of chemical reaction in which two or more substances combine and form one compound

(a)  

a type of chemical reaction in which one compound breaks down and forms two or more substances

(a)  

a type of chemical reaction in which one element replaces another element in a compound

(a)  

a type of chemical reaction in which the negative ions in two compounds switch places, forming two new compounds

(a)  

a chemical reactionin which a substance combines with oxygen and releases energy

(a)  

a chemical reaction that absorbs thermal energy

(a)  

a chemical reaction that releases thermal energy

(a)  

the minimum amount of energy needed to start a chemical reaction

(a)  

a substance that increases reaction rate by lowering the activation energy of a reaction

(a)  

a catalyst that speeds up chemical reactions in living cells

(a)  

a substance that slows or even stops a chemical reaction

(a)  

a(n) (a)   change does not produce new substances

during a(n) (a)   change, new substances form.

the starting substances and the substances ________ have different physical and chemical ________

(a)  

a chemical reaction is a process in which _____ of one or more substances rearrange to form one or more new ________

(a)  

what are some changes in physical properties that can indicate a chemical reaction?

(a)  

a solid formed when two liquids mixed is called a(n) (a)   and can be evidence of a chemical reaction

a change in (a)   is another sign that a chemical reaction has occurred

(a)   energy is absorbed or released during a chemical reaction and is evidenced by warming or cooling

During a chemical reaction, ___ __ ____ elements or compounds _____ and form new elements or compounds

(a)  

atoms rearrange when chemical (a)   between atoms break

A(n) _______ ________ is a description of a reaction using element symbols and chemical formulas

(a)  

element symbols represent (a)  

when an element exists as a(n) (a)   molecule, the element symbol is followed by the subscript of 2

molecules composed of only two atoms, of the same or different chemical elements

(a)  

chemical formulas represent (a)  

a chemical formula contains ______ symbols and ________ to describe the makeup of a compound

(a)  

when chemical formulas differ, they represent different (a)  

a chemical equation includes the substances that _____ and the substance that ______

(a)  

(a)   are the starting substances in a chemical reaction

(a)   are the substances produced by a chemical reation

In a chemical equation, the _______ are written to the left of an arrow, and the ______ are written to the right of the arrow

(a)  

what is written to the left of an arrow in a chemical equation

(a)  

what is written to the right of the arrow in a chemical equation?

(a)  

two or more reactants are separated by (a)   signs, as are any two or more products

the law of ____________ ___ _____ states that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction

(a)  

mass is conserved in a chemical reaction because (a)   are conserved

to show that mass is conserved, a chemical equation must show that the number of each type of ____ must be ________, or the same on both sides of the equation

(a)  

chemical equations are balanced by adding (a)  

a coefficient is a(n) (a)   placed in front of an element symbol or a chemical formula in an equation

There are (a)   major types of chemical reactions

each type of chemical reaction follows a unique _______ in the way atoms in reactants ________ to form products

(a)  

In a(n) (a)   reaction, two or more substances combine.

The product in a synthesis reaction is a(n) (a)  

a synthesis reaction has _______ reactant(s) and ____ product(s)

(a)  

In a(n) (a)   reaction, a substance breaks down and forms two or more substances

the reactant in a decomposition reaction is a(n) (a)  

the products in a decomposition reaction can be (a)   or compounds

a decomposition reaction has ___ reactant(s) and __________ product(s)

(a)  

in a(n) ___________ reaction, an atom or group of atoms replaces a part of a(n) _________

(a)  

In a(n) ______-__________ reaction, one element replaces another element in a compound

(a)  

the reactants in a ______-replacement reaction are a(n) ________ and a(n) ________

(a)  

the products in a single-replacement reaction are a ________ element and a different ________

(a)  

In a(n) ______-____________ reaction, the ________ ions in two compounds switch places, forming two new compounds.

(a)  

the reactants in a double-replacement reaction are ___ compounds

the products in a double-replacement reaction are two ___ _______

(a)  

In a(n) ________ reaction, a substance combines with _______ and releases energy, usually in the form of _______ energy and light energy

(a)  

energy released in a chemical reaction comes from ________ ______ that is contained in chemical _____.

(a)  

breaking a chemical bond _______ energy from the surroundings.

forming a chemical bond ________ energy to the surroundings.

(a)  

the energy in chemical bonds and the energy absorbed or released is always (a)   .

___________ reactions are chemical reactions that absorb thermal reactions.

in these reactions, ____ energy is required to break the bonds of the _______ than is released when products form.

(a)  

__________ reactions are chemical reactions that release thermal energy.

in these reactions, ____ energy is required to break the bonds of the _______ than is released when products form.

(a)  

all reactions require _______ to start the breaking of _____.

_________ ______ is the minimum amount of energy that is needed to start a chemical reaction.

(a)  

the __________ energy of some reactions is so ___ that enough energy to start the reaction comes from the __________.

(a)  

the activation of some reactions is so ____ that more _____ is needed to start the reaction

(a)  

the rate of a _______ is the _____ at which it occurs.

(a)  

chemical reactions occur _______ if the particles ______ more often or if the particles move ______ when they collide

(a)  

_______ area can affect the ____ of a reaction.

Surface area is the amount of ______ outer area of a _____

(a)  

_________ surface area increases the rate of reaction because more _______ on the surface of a solid come in contact with the particles of another ________.

(a)  

__________ can affect the rate of reaction because at _______ temperatures, particles move faster.

(a)  

at ______ temperatures, particles _______ more often. they also collide with more ______

(a)  

an increase in ___________ also increases reaction rate because there are more _______ to _______ with each other

(a)  

for gases, increased ________ pushes particles ______ together, and more ________ occur.

(a)  

a(n) ________ increases reaction rate by lowering the ________ energy of a reaction.

(a)  

a catalyst is not itself permanently ________ during a chemical reaction. _______ also do not change the ________ or the products of the reaction.

(a)  

a(n) _______ is a catalyst that ______ __ chemical reactions in living cells.

(a)  

substances called ________ slow down or ____ a chemical reaction.

(a)