CHEM 130 Study Guide - Midterm Guide: Allotropes Of Phosphorus, Oxygen, Lithium Hydroxide
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Physical properties: a characteristic that can be observed for a material without changing its chemical identity. Soft, silver colored, melting point (64 degrees) Chemical properties: a characteristic of a material involving a chemical change. Reacts with water, reacts with oxygen etc. Heterogeneous mixture: mixture that consists of physically distinct parts, each with different properties. Salt and iron filings, oil and water. Homogenous mixture: a mixture that is uniform in properties, also called a solution. Significant figures: digits in a measured number (or a result of a calculation of measured numbers) that include all certain digits plus a final one having some uncertainty. Keep the smallest number of significant figures. Keep the smallest number of decimal places. Have an infinite number of significant figures. Look at the first digit to the right of the last significant figure. Cathode rays bend toward (+) end of magnet and that means they are negatively charged.