chemical equations and evidence of a chemical reactions
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| 4Al + 3O₂ → 2Al₂O₃ In the equation above, what is the coefficient of the oxygen molecule? | The coefficient of the oxygen molecule is 3.
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| 4Al + 3O₂ → 2Al₂O₃ In the equation above, what is the subscript of the oxygen molecule? | The subscript of the oxygen molecule is 2.
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| Elements and compounds on the left side of the equation are called _____________. | Reactants
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| Elements and compounds on the right side of the equation are called _____________. | Product
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| 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
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| 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
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| 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)
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| Determine the number of atoms of each element in the substance NaHCO₃. | Sodium= 1
Hydrogen= 1
Carbon= 1
Oxygen= 3
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| Determine the number of atoms of each element in the substance 2NaOH. | Sodium=2
Oxygen=2
Hydrogen=2
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| Balance the following equation: ____ Ti(OH)₃ → ____ Ti₂O₃ + ____H₂O | 2Ti(OH)₃ → 1Ti₂O₃ + 3H₂O
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| Balance the following equation: ____ Ag₂O + ____ C → ____ Ag + ____ CO₂ | 2Ag₂O + 1C → 4Ag + 1CO₂
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| 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)
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| What does RAP stand for | Reactant on the Left, Product on the Right
Reactant/ Arrow/ Product
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| New substances formed in a chemical reaction are found on the _________ side of the equation. | right
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| What does the arrow in a chemical equation mean? | Yields
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| 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
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| What is the definition of a subscript? | Shows how many atoms of an element are in a molecule.
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| What is the definition of a coefficient? | Shows how many molecules there are of a particular chemical.
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| 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.
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| Balance the following equation: _____C₃H₈ + _____O₂ → _____CO₂ + _____H₂O | C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
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| 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
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| 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
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| How many molecules of 2NH4 are there | The coefficient is a 2 so that means there are 2 molecules
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