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10 Cards in this Set
- Front
- Back
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In the chemical reaction Iron + Oxygen → Iron Oxide, what is iron? (reactant? product?) |
Both iron and oxygen are reactants. The Iron Oxide is the product. Everything to the left of the → is a reactant. Everything to the right is a product. |
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Give examples of a physical change. |
Physical changes are those that result in the same substance. Any change in state or size are examples. |
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How is a physical change distinguished from a chemical change? |
A physical change results in the same substance. A new substance results from a chemical change. |
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Give examples of a chemical change. What must occur for a change to be a chemical change? |
A chemical change results in a new substance. Therefore, for a chemical change to take place, the resulting substance must have different chemical properties. |
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How are solids, liquids, and gases related? |
Solids have a definite shape and definite volume. Liquids have the shape of their container but a definite volume. Gases have the shape and volume of their container. |
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What type of change occurs when iron and oxygen combine to form iron oxide? |
Chemical change. |
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If 50g of H₂ are reacted completely with O₂ to produce 75g of water, how much oxygen is required? |
The law of conservation of mass states that in any physical change or chemical reaction, mass is conserved. Mass is neither created or destroyed. The mass of the reactants must equal the mass of the products. 50g + O₂ = 75g. O₂ must be 25g. |
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Which statement dictates that the amount of mass in a chemical reaction can neither be created nor destroyed? |
The law of conservation of mass |
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Classify each of the following as physical or chemical changes. For each chemical change, cite the observable evidence that indicates a chemical change has occured.
a. boiling water b. fizzing of an Alka-Seltzer tablet in water c. dissolving sugar in hot tea d. burning a candle e. corroding a battery |
(The evidence that supports that a chemical change has occured include: production of a gas, color change, formation of a precipitate, transfer of energy)
a. physical change b. chemical, evolution of gas c. physical d. chemical, transfer of energy e. chemical, formation of a precipitate and color change |
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Identify each mixture as either homogeneous (same throughout) or heterogeneous (different).
a. stainless steel b. granite c. oil and water d. wild bird seed e. gasoline |
a. homogeneous b. heterogeneous c. heterogeneous d. heterogeneous e. homogeneous |
