Reactants are found on the Left Side of an equation.
What is found on the right side of an equation?
Products are found on the right side of an equation.
What type of reaction absorbs energy?
An endothermic reactionabsorbs energy.
What is a reaction with an element and a compound that forms a different compound and a different element?
A single replacement reaction is a reaction with an element and a compound that forms a different compound and a different element.
What is a reaction between 2 complex compounds that produce 2 different complex compounds?
A double replacement is a reaction between 2 complex compounds that produce 2 different complex compounds.
What is a reaction that releases energy?
An exothermic reaction is a reaction that releases energy.
What is the Law of Conservation and Mass?
The Law of Conservation and Mass states that the number of atoms in the reactants must equal the number of atoms in the products.
Electrons in the outermost energy level are called…….
Valence Electrons.
In the chemical formula for H2O, the number 2is the ___________.
Subscript.
A substance that can speed up a reaction but is not charged or used up in the reaction is a...
Catalyst.
Which of the follow will DECREASE the rate at which a reaction will take place?
B. lower the concentration
will DECREASE the rate at which a reaction will take place.
Any number written in front of a molecule is called a…
D. coefficient
What is it called when complex molecules become simple?
Decompostion.
In a typical relationship, temperature and rate of chemical reaction both…..
INCREASE.
What kind of reaction is this?
2H2O ____> 2H2 + O2
a Decomposition reaction
The reaction Mg ___> 2HCI ___> MgCl2 + H2
would be considered what type of reaction?
A Single Replacementreaction
H2 + Cl2 ____> 2HCl
illustrates what?
The Conservation of Mass
When an exothermic reaction occurs in a water solution, the temperature of the solution….
Increases because energy is given off by the reaction.
Cu(s) + 2HCl(aq) ___> H2(g) + CuCl2(aq)
is an example of a ...
Single Replacement reaction
True or false...
An endothermic reaction absorbs heat
TRUE
A neutral atom always has equal numbers of ?
protons and neutrons.
Charcoal reacts with oxygen according to the equation...
C(s) + O2(g) ____> CO2(g)
Which of the following changes would cause the greatest increase in the rate of reaction?
a. cooling the O2 gas
b. decreasing the concentration of O2
c. using charcoal in powdered form
d. using charcoal in lump form
c. using charcoal in powdered form
Atoms become positive ions by...
losing electrons
In which group does each element have a total of four electrons in the outermost principal energy level?
a. 1 (IA)
b. 18 (O)
c. 16 (VIA)
d. 14 (IVA)
d. 14 (IVA)
The addition of a catalyst to a chemical reaction would result in a change in the….
activation energy.
A chemical reaction is usually started by providing the necessary….
activation energy.
As a Na atom forms an Na ion, the number of protons in its nucleus….
remains the same.
What is the number of valence electrons in an atom of phosphorus?
five
Use the compound below and answer the questions that follow.
2 NaOH
# molecules ____
# elements ____
#Na _____
# O _____
#H ______
# molecules = 2
# elements = 3
# Na = 2
# O = 2
# H = 2
List three things that are evidence of a chemical reaction….
1. gas production
2. color change
3. property change
4. temperature change
5. precipitation
In a synthesis reaction, two or more simple substances combine to form a new, more complex substance. The generalized equation for a synthesis reaction is as follows….
A + B __________> AB
Where A and B represent elements from the periodic table.
For example: Na + Cl _________> NaCl
In a Decomposition Reaction, a complex substance breaks down into two or more simple substances. Decomposition reactions are the reverse of synthesis reactions. The generalized equation for a decomposition reaction is as follows….
AB _________> A + B
Where A and B represent elements from the periodic table.
For example:
NaCl _________> Na + Cl2
In a Single Replacement Reaction, an uncombined element replaces an element that is part of a compound. The generalized equation for a single replacement reaction is as follows...
A + BC _________> AC + B
In this reaction the A and B switched places, or replaced each other, in the reaction. A, B, and C represent elements from the periodic table.
For example:
Na + H2O _________> NaOH + H2
In this case, the sodium and the hydrogen switched places.
In a Double Replacement Reaction, different atoms in two different compounds replace each other. In other words, two compounds react to produce two new compounds. The generalized equation for a double replacement reaction is as follows...
AB + CD ________> AC + BD
In this reaction, the elements from both compounds switched places, or replaced each other, in the compounds to form two new compounds. A, B, C, and D represent elements on the periodic table.
For example:
NaOH + HCl ________> NaCl + H2O
in this case, the sodium and the hydrogen replaced each other and formed two new compounds from the original compounds.
Label each of the following reactions as synthesis, decomposition, single replacement, and double replacement.
