Balancing
The difference between a skeleton equation and a balanced chemical equation.
The coefficient numbers are not written in a skeleton equation.
Ca + 2 HCl → CaCl2 + H2
Single replacement reaction
What name is given to the minimum amount of energy needed by particles for them to react when they collide?
Activation energy
According to kinetic molecular theory, particles are...
in constant motion
4NH3, how many N and how many H?
4 N atoms and 12 H atoms
The best definition of subscript is...
In chemistry, a "subscript" is a small number written below and to the right of a chemical symbol in a formula, indicating the number of atoms of that element present in a molecule of a compound; essentially, it tells you how many atoms of a specific element are in a molecule
3 AgNO3 + K3PO4 → Ag3PO4 + 3 KNO3
Double replacement reaction
Which of the following would speed up a reaction?Using lumps instead of powder
Increasing the concentration of an acid
Increasing the concentration of an acid
Chemical reactions ____.A) occur only in living organisms B) create and destroy atoms C) only occur outside living organisms D) produce new substances
D
2 carbon atoms and 4 oxygen atoms
Balancing a chemical equation upholds the law of conservation of mass by ensuring that the total number of atoms of each element on the reactant side (starting materials) is equal to the total number of atoms of each element on the product side (resulting substances), meaning that no mass is created or destroyed during the chemical reaction, as stated by the law of conservation of mass.
2 C6H14 + 19 O2 → 12 CO2 + 14 H2O
Combustion reaction
Which of the following will increase the frequency of successful collisions?
Increasing the temperature
Increasing the temperature
Chemical equations _____. A) describe chemical reactions B) show how to write chemical formulas C) give directions for naming chemical compounds D) describe only biological changes
A
4K2CO3, how many atoms?
____ FeS2 + ____ O2 yields ____ Fe2O3
Balance this skeleton equation by adding the lowest whole number coefficients.
Coefficients are 4, 3, and 2.
BaCO3 → BaO + CO2
Decomposition reaction
Which of the following statements about catalysts is false?
They speed up reactions
They provide an alternative reaction pathway with a lower activation energy
They become chemically changed at the end of the reaction
They become chemically changed at the end of the reaction
A skeleton equation does NOT show which of the following? A) the correct formulas of the reactants and products B) the reactants on the left, the products on the right C) an arrow connecting the reactants to the products D) the physical states of the substances E) the relative amounts of reactants and products
E
4Al(OH)3, how many atoms?
4 Al atoms, 12 O atoms and 12 H atoms
Balance this skeleton equation by adding the lowest whole number coefficients.
____S8 + ____O2 yields SO3
Coefficients are 1, 12, and 8.
P4 + 5 O2 → 2 P2O5
Synthesis reaction
Using the particle theory, which of the following correctly explains why a higher temperature increases the rate of reaction?
As temperature increases, particles gain more energy resulting in a greater chance of a successful collision
As temperature decreases, particles gain more energy and more collisions occur
As temperature increases, particles lose energy resulting in fewer successful collisions
As temperature increases, particles gain more energy resulting in a greater chance of a successful collision
Chemical equations must be balanced to satisfy the _____. A) law of definite proportions B) law of multiple proportions C) law of conservation of mass D) principle of Avogadro
LOCOM (C)
6Ba(MnO4)2, how many atoms?
6 Ba atoms, 12 Mn atoms, 48 O atoms