Which of the following is a pure substance: rock air elemental oxygen honey tap

Question

Which of the following is a pure substance: rock air elemental oxygen honey tap water Which of the following is not an intensive property? boiling point temperature melting point mass density Which of the following is a chemical, not a physical, property? Water freezes at zero degrees Celsius sodium metal reacts with water Gold has a density of 19.32 g/cm3 Liquid bromine has a reddish brown color Sucrose dissolves in water Which of the following is a heterogeneous mixture? Hot tea Beach sand Aluminum foil Sodium chloride air Define the following terms: chemistry B. matter Given an example of the following two terms. A. pure substance B. mixture

Explanation / Answer

10

elemental oxygen, all otherxs are compounds or mixtures

11

mass, since this depedns on the amount of susbtance

12

sodium reacting with water, since there is a chemical reaction

13

beach sand, you may see diffrent compounds in mix

14

chemistry = science of matter and its changes

matter = anything that takes up space and has mass

15

pure sub = any substance that will have fixed properties and cant be broken down to a simplier category

mixture = at least 2 or more pure substances; properties may vary dependin gon both types of subtamces

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