General Chemistry PDF

GENERAL CHEMISTR Y  Pure substance and mixture WHAT is PURE SUBSTANCE? A pure substance has constant composition and distinct chemical properties. Examples What is mixture A mixture is a material composed of two or more simpler substances in chemistry. Such materials can be...

GENERAL CHEMISTR Y  Pure substance and mixture WHAT is PURE SUBSTANCE? A pure substance has constant composition and distinct chemical properties. Examples What is mixture A mixture is a material composed of two or more simpler substances in chemistry. Such materials can be compounds or chemical elements Examples PURE SUBSTANCE and MIXTURE PURE SUBSTANCE ELEMENT COMPOUND An element is a pure A compound contains chemical substance made atoms of different elements of same type of atom. chemically combined Example together in a fixed ratio Hydrogen Example Helium NaCl Copper H2SO4 Zinc H2O Atoms, Elements and Compound  MIXTURE HOMOGENEOUS MIXTURE HETEROGENEOUS MIXTURE A homogeneous mixture is a A heterogeneous mixture is a mixture in which the mixture where throughout composition is uniform the solution the throughout the mixture composition is not uniform. Element of Smart Phone Mixture in Food  Pure Mixture substance Element Compound Heterogen Homogene eous ous QUIZ TIME 1.Which of the following is NOT an example of a pure substances? a. Iron c. Salt b.Copper d. Air QUIZ TIME 2. The ________________ are pure substances that are made up of only one kind of atom ? a. Element c. Compound b.Mixture d. Pure substance QUIZ TIME 3. It refers to the physical combination of two or more substances in which identities are retained and are mixed in the form of solutions, suspension, and colloids. a.Mixture c. Pure substance b.Elements d. Compound QUIZ TIME 4. Which of the following is NOT an example of homogeneous mixture? a.Salt and water solution c. Cake b.Apple juice d. none of above QUIZ TIME 5. Which of the following is TRUE about heterogeneous mixture? a. Particles are distributed evenly throughout b.It is a pure substance c.It is made of more than one element bound together d.Particles are not distributed evenly. QUIZ TIME 1.Which of the following is NOT an example of a pure substances? a. Iron c. Salt b.Copper d. Air QUIZ TIME 2. The ________________ are pure substances that are made up of only one kind of atom ? a. Element c. Compound b.Mixture d. Pure substance QUIZ TIME 3. It refers to the physical combination of two or more substances in which identities are retained and are mixed in the form of solutions, suspension, and colloids. a.Mixture c. Pure substance b.Elements d. Compound QUIZ TIME 4. Which of the following is NOT an example of homogeneous mixture? a.Salt and water solution c. Cake b.Apple juice d. none of above QUIZ TIME 5. Which of the following is TRUE about heterogeneous mixture? a. Particles are distributed evenly throughout b.It is a pure substance c.It is made of more than one element bound together d.Particles are not distributed evenly.