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Equations & reaction

chemical equations and evidence of a chemical reactions

QuestionAnswer
4Al + 3O₂ → 2Al₂O₃ In the equation above, what is the coefficient of the oxygen molecule? The coefficient of the oxygen molecule is 3.
4Al + 3O₂ → 2Al₂O₃ In the equation above, what is the subscript of the oxygen molecule? The subscript of the oxygen molecule is 2.
Elements and compounds on the left side of the equation are called _____________. Reactants
Elements and compounds on the right side of the equation are called _____________. Product
What is the product? It is the new substance that is formed during a chemical reaction. It is found on the right side of the equation
What law states that the same number of atoms of each of the elements must be found in both the reactants and the products of the reaction? Law of Conservation of Mass
What 5 pieces of evidence show that a chemical reaction has occurred? 1. Formation of a precipitate (PLEASE) 2. Change in temperature (EXCUSE) 3. Color change (COUGH) 4. Change of odor (SNEEZES) 5. Bubbles (BURPS)
Determine the number of atoms of each element in the substance NaHCO₃. Sodium= 1 Hydrogen= 1 Carbon= 1 Oxygen= 3
Determine the number of atoms of each element in the substance 2NaOH. Sodium=2 Oxygen=2 Hydrogen=2
Balance the following equation: ____ Ti(OH)₃ → ____ Ti₂O₃ + ____H₂O 2Ti(OH)₃ → 1Ti₂O₃ + 3H₂O
Balance the following equation: ____ Ag₂O + ____ C → ____ Ag + ____ CO₂ 2Ag₂O + 1C → 4Ag + 1CO₂
Write this in equation form: 2Ag₂O is formed when 4Ag reacts with O₂. 4Ag + O₂ → 2Ag₂O explained. it states that 2Ag2O is formed (this this the product) when 4Ag reacts with O2 (reactant side)
What does RAP stand for Reactant on the Left, Product on the Right Reactant/ Arrow/ Product
New substances formed in a chemical reaction are found on the _________ side of the equation. right
What does the arrow in a chemical equation mean? Yields
Which of the following equations follows the Law of Conservation of Mass? A: C₂H₄ + 3O₂ → 2CO₂ + 2H₂O B: C + 4H₂→ CH₄ C: 2Na + Cl → NaCl D: 3H₂O → 3H₂ + 3O₂ A. C₂H₄ + 3O₂ → 2CO₂ + 2H₂O
What is the definition of a subscript? Shows how many atoms of an element are in a molecule.
What is the definition of a coefficient? Shows how many molecules there are of a particular chemical.
True or False: If a chemical equation is unbalanced, then change the subscripts in order to balance it. False! You can only change the coefficients in a chemical equation.
Balance the following equation: _____C₃H₈ + _____O₂ → _____CO₂ + _____H₂O C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Is the following equation balanced? If not, what is the correctly balanced equation? Fe + Cl₂ → FeCl₃ The equation is not balanced. The correct formula is 2Fe + 3Cl₂ → 2FeCl₃
Which of the following represents a physical change? A. Production of an odor B. Change in color C. An ice cube melting D. Change in temperature C. An ice cube melting
How many molecules of 2NH4 are there The coefficient is a 2 so that means there are 2 molecules
Created by: ccgalloway
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