Elements, Compounds or Mixtures
Acids and Bases
Chemical Formulas
Chemical Reactions
A Balancing Act
100
The Periodic Table only consists of these pure substances.
What are elements?
100
This category of substances have a PH value greater than 7.
What are bases?
100
The number 2 tell us this in the chemical formula for H2O.
What is the number of hydrogen atoms which is 2?
100
The substances located on the left side of a chemical equation and are used up in the process.
What are reactants?
100
We balance chemical equations to follow this law. The law states that mass cannot be created nor destroyed.
What is The Law of Conservation of Mass?
200
Table salt (NaCl) is made up of sodium and chlorine which have been bonded together. Table salt is considered to be this type of substance.
What is compound?
200
This category of substances have a PH value lower than 7.
What are acids?
200
The lack of a number after the O in the chemical formula of H2O tells us this.
What are the number of Oxygen atoms in water which is 1?
200
The substances located on the right side of a chemical reaction that are newly formed.
What are products?
200
To balance chemical equations we add these numbers in front of the reactants and products.
What are coefficients?
300
These two categories of substances are considered to be pure substances which have a definite and constant composition.
What are Elements and Compounds?
300
Pure Water is the only substance with a PH of 7. Pure water is considered to be this type of substance.
What is a neutral substance?
300
The number written after an element symbol that represents the number of atoms of the element is called this.
What is a subscript?
300
In this type of reaction, energy is absorbed from the surrounding area causing the temperature to decrease.
What is an endothermic reaction?
300
Would we consider the equation below to be balanced or unbalanced?
Na + Cl
What is balanced?
400
Solutions such as salt water are considered to be this type of substance.
What is homogeneous mixture?
400
These substances produce hydrogen ions (H+) when in water. The chemical formula often includes and H such as HCl.
What are acids?
400
The compound below represents what type of bond- Ionic or Covalent?
NaCl
What is Ionic Bond?
Ionic bonds are formed between a metal and nonmetal.
Covalent bonds are formed between two nonmetals.
400
In this type of reaction, energy is released as light or heat.
What is an exothermic reaction?
400
What number should be written in front of Na to balance the equation:
Na + MgCl2
What is the number 2?
500
Of the following list, which item is considered to be a pure substance?
Salt Water
Salt (NaCl)
Pumpkin Pie
Ice Tea
What is Salt (NaCl)?
It is a compound and compounds are pure substances. Elements are also pure substances.
The rest of the substances are mixtures- not uniform throughout.
500
These substances produce hydroxide ions (OH-) in water. The chemical formula normally contains OH such as LiOH.
What are bases?
500
Ionic bonds differ from Covalent bonds in this way.
What is electrons are transferred in Ionic bonds, but electrons are shared in Covalent bonds?
500
A chemical reaction that has a rate equal in both directions or a constant concentration of reactants and products has reached this.
What is equilibrium?
500
What coefficient should be placed in front of N2 to balance the equation below.
H2+N2
What is the number 3?