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Chapter 4 Study Guide Honors Science Mrs. Burris
Question | Answer |
---|---|
What is a physical property of matter? | Something you observe without changing the substance. |
What is a chemical property of matter? | A substance changing from one substance to the other. |
Be able to determine a physical change from a chemical change. | Physical change- glass breakingChemical change- paper burning |
What is an element? | A simplest pure substance. |
How many elements have been identified? | 115 |
What is a shorthand way of writing an element? | A symbol |
From what language are some of the odd elements taken? | Latin |
What is the smallest unit of an element? | An atom |
Differentiate between homogeneous and heterogeneous matter. 3 Examples of each. | Homogenous matter- Matter which has the same composition throughout Heterogeneous matter- Matter which has no specific composition |
What is the simplest pure substance? | An element. |
What is a mixture? | a mixture is a substance made by combining two or more different materials without a chemical reaction occurring |
What are three types of mixtures? | Suspension, Colloidial, Solution |
List and describe 4 ways of seperating mixtures. (lab on chromatography) | filtrationb. decantation(includes evaporation and condensation)c. distillationd. chromatographye. crystallization |
Be able to list 3 factors that affect solubility. | (1) Temperature (2) Nature of solute or solvent (3) Pressure |
What is a compound? | A chemical compound is a substance consisting of two or more different elements chemically bonded together in a fixed proportion by mass. |
Can mixtures be pure? Compounds? | Yes. |
What does the Law of Definite Proportions state? | A chemical compound always contains exactly the same proportion of elements by mass. |
What is a subscript? Coefficient? | The 2 in H2O is a subscript. |
Be able to count atoms of a compound if given the formula. | |
Be able to balance simple chemical equations and label: subscript, coefficient, yields, products, and reactants. | |