Balancing Chemical Equations
What is the law that states matter cannot be created or destroyed?
What is the Law of conservation of mass?
What type of reaction is A + B → AB?
What is a synthesis reaction?
What is a hydrogen bond?
What is a weak bond between a hydrogen atom in one molecule and an electro-negative atom in another molecule?
What is a chemical equation?
What is a symbolic representation of a chemical reaction?
What is polarity in chemistry?
What is the distribution of electrical charge over the atoms joined by the bond?
A change in matter that produces new substances is called a(n)
What is a chemical reaction?
A change in matter that produces new substances is called a(n)?
What is a chemical Change?
Balance the equation: H2 + O2 →H2O
What is 2H2 + O2 →2H2O
What type of reaction is AB →A + B?
What is a decomposition reaction?
Name a molecule that commonly forms hydrogen bonds.
What is water (H2O)?
What are the substances called that are present at the beginning of a chemical reaction?
What are reactants?
What type of bond occurs when electrons are shared unequally between atoms?
What is a polar covalent bond?
Chemical equations must be balanced because chemical reactions obey the principle of?
What is the Law of conservation of mass?
Which of the following cannot be true of a physical change?
a. change in size
B. Change in temperature
C. Change in state of matter
D. New substance produced.
What is D?
In the equation C3H8 + O2 →CO2 + H2O, what is the coefficient of O2 when balanced?
What is 5?
What type of reaction involves an element reacting with a compound to form a new element and a new compound?
What is a single displacement reaction?
How do hydrogen bonds affect the boiling point of water?
What is they will raise the boiling point?
What are the substances called that are formed as a result of a chemical reaction?
What are products?
What makes a molecule polar?
What is an uneven distribution of electron density?
How many atoms are in the following compound (OH)4?
What is 8?
Which of the following is an example of a physical property?
A. Chemical composition
B. freezing point
C. ability to burn
D. ability to react with metals
What is B?
Balance the equation: Fe2O3 + H2 →Fe + H2O
What is Fe2O3 + 3H2 → 2Fe + 3H2O
What type of reaction is AB + CD→ AD + CB
What is a double displacement reaction?
What property of water is a result of hydrogen bonding and allows insects to walk on water?
What is surface tension?
In a chemical equation, what does the arrow (→) represent?
What is "yields" or produces?
Is water a polar or nonpolar molecule?
What is polar?
In what system (opened or closed) are atoms allowed to leave the system?
What is an open system?
Which of the following is an example of a chemical change?
A. meat spoiling
B. mercury rising in a barometer
C. water freezing
D. butter softening
What is A?
Balance the equation: C2H6 + O2 →CO2 + H2O
What is 2C2H6 + 7O2 → 4CO2 + 6H2O
What type of reaction is CH4 + 2O2 → CO2 + 2H2O
What is a combustion reaction?
In DNA, hydrogen bonds occur between which types of molecules?
What are nitrogenous bases?
What does it mean for a chemical equation to be balanced?
What is having the same number of each type of atom on both sides of the equation?
Why is polarity important in the dissolving process?
What is because polar molecules dissolve well in polar solvents (like water), and nonpolar molecules dissolve well in nonpolar solvents?
What type of reaction gains heat or energy during a chemical reaction?
What is an endothermic reaction?
True or False? Combustion is the rapid reaction between carbon dioxide and fuel.
What is false?