Counting Atoms & Balancing
This law states that mass is neither created nor destroyed in a chemical reaction, only rearranged.
What is the Law of Conservation of Mass?
The type of reaction where two elements combine to form one compound.
What is a synthesis reaction?
The two products always formed in the complete combustion of a hydrocarbon (CₓHᵧ).
What are carbon dioxide (CO₂) and water (H₂O)?
A reaction that gives off heat, making the surroundings feel warmer.
What is an exothermic reaction?
Chemicals that change color depending on the pH they are placed in.
What are indicators?
The total number of atoms in one molecule of Ca(NO₂)₂
What is 7?
(1 Ca, 2 N, 4 O)
The type of reaction shown here:
Zn + 2 HCl → ZnCl₂ + H₂.
What is a single replacement reaction?
The two products of a neutralization reaction.
What are a salt and water?
A reaction that absorbs energy, making the surroundings feel colder.
What is an endothermic reaction?
The chemical formula of an acid usually starts with this element.
What is hydrogen (H)?
The total number of Iron (Fe) atoms in
3 Fe₂(CrO₄)₃
What is 6?
(3 x 2)
The reaction
CₓHᵧ + O₂ → CO₂ + H₂O
is the general formula for this type of reaction.
What is a combustion reaction?
The single product formed when sodium (Na) and chlorine (Cl₂) react.
What is sodium chloride (NaCl)?
In an exothermic reaction, these have more energy: the reactants or the products.
What are the reactants?
The property used to describe bases, which is the opposite of the sour taste of acids.
What is bitter taste (or feeling slippery)?
The only numbers you are allowed to change when balancing an equation.
What are coefficients?
The type of reaction where an acid and a base produce a salt and water.
What is a neutralization reaction?
The products of a single replacement reaction between Al and CuSO₄.
What are aluminum sulfate (Al₂(SO₄)₃) and copper (Cu)?
In an endothermic reaction, energy is written on this side of the chemical equation.
What is the reactant side?
This indicator is yellow in acid and blue in base.
What is bromothymol blue?
Balance this combustion reaction:
_ C₃H₈ + _ O₂ → _ CO₂ + _ H₂O
What are 1, 5, 3, and 4?
The reaction
Pb(NO₃)₂ + KI → PbI₂ + KNO₃
is an example of this reaction type
What is a double replacement reaction?
The salt produced when hydrochloric acid (HCl) neutralizes potassium hydroxide (KOH).
What is potassium chloride (KCl)?
The term for the energy required to start a reaction, represented by the "hill" in an energy diagram.
What is activation energy?
This indicator is colorless in acid and turns pink in a base.
What is phenolphthalein?